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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
<meta http-equiv="Content-Type" content="application/xhtml+xml; charset=UTF-8" />
<meta name="generator" content="AsciiDoc 10.1.3" />
<title>Migration Guide for the Next Scripting Language</title>
<style type="text/css">
/* Shared CSS for AsciiDoc xhtml11 and html5 backends */
/* Default font. */
body {
font-family: Georgia,serif;
}
/* Title font. */
h1, h2, h3, h4, h5, h6,
div.title, caption.title,
thead, p.table.header,
#toctitle,
#author, #revnumber, #revdate, #revremark,
#footer {
font-family: Arial,Helvetica,sans-serif;
}
body {
margin: 1em 5% 1em 5%;
}
a {
color: blue;
text-decoration: underline;
}
a:visited {
color: fuchsia;
}
em {
font-style: italic;
color: navy;
}
strong {
font-weight: bold;
color: #083194;
}
h1, h2, h3, h4, h5, h6 {
color: #527bbd;
margin-top: 1.2em;
margin-bottom: 0.5em;
line-height: 1.3;
}
h1, h2, h3 {
border-bottom: 2px solid silver;
}
h2 {
padding-top: 0.5em;
}
h3 {
float: left;
}
h3 + * {
clear: left;
}
h5 {
font-size: 1.0em;
}
div.sectionbody {
margin-left: 0;
}
hr {
border: 1px solid silver;
}
p {
margin-top: 0.5em;
margin-bottom: 0.5em;
}
ul, ol, li > p {
margin-top: 0;
}
ul > li { color: #aaa; }
ul > li > * { color: black; }
.monospaced, code, pre {
font-family: "Courier New", Courier, monospace;
font-size: inherit;
color: navy;
padding: 0;
margin: 0;
}
pre {
white-space: pre-wrap;
}
#author {
color: #527bbd;
font-weight: bold;
font-size: 1.1em;
}
#email {
}
#revnumber, #revdate, #revremark {
}
#footer {
font-size: small;
border-top: 2px solid silver;
padding-top: 0.5em;
margin-top: 4.0em;
}
#footer-text {
float: left;
padding-bottom: 0.5em;
}
#footer-badges {
float: right;
padding-bottom: 0.5em;
}
#preamble {
margin-top: 1.5em;
margin-bottom: 1.5em;
}
div.imageblock, div.exampleblock, div.verseblock,
div.quoteblock, div.literalblock, div.listingblock, div.sidebarblock,
div.admonitionblock {
margin-top: 1.0em;
margin-bottom: 1.5em;
}
div.admonitionblock {
margin-top: 2.0em;
margin-bottom: 2.0em;
margin-right: 10%;
color: #606060;
}
div.content { /* Block element content. */
padding: 0;
}
/* Block element titles. */
div.title, caption.title {
color: #527bbd;
font-weight: bold;
text-align: left;
margin-top: 1.0em;
margin-bottom: 0.5em;
}
div.title + * {
margin-top: 0;
}
td div.title:first-child {
margin-top: 0.0em;
}
div.content div.title:first-child {
margin-top: 0.0em;
}
div.content + div.title {
margin-top: 0.0em;
}
div.sidebarblock > div.content {
background: #ffffee;
border: 1px solid #dddddd;
border-left: 4px solid #f0f0f0;
padding: 0.5em;
}
div.listingblock > div.content {
border: 1px solid #dddddd;
border-left: 5px solid #f0f0f0;
background: #f8f8f8;
padding: 0.5em;
}
div.quoteblock, div.verseblock {
padding-left: 1.0em;
margin-left: 1.0em;
margin-right: 10%;
border-left: 5px solid #f0f0f0;
color: #888;
}
div.quoteblock > div.attribution {
padding-top: 0.5em;
text-align: right;
}
div.verseblock > pre.content {
font-family: inherit;
font-size: inherit;
}
div.verseblock > div.attribution {
padding-top: 0.75em;
text-align: left;
}
/* DEPRECATED: Pre version 8.2.7 verse style literal block. */
div.verseblock + div.attribution {
text-align: left;
}
div.admonitionblock .icon {
vertical-align: top;
font-size: 1.1em;
font-weight: bold;
text-decoration: underline;
color: #527bbd;
padding-right: 0.5em;
}
div.admonitionblock td.content {
padding-left: 0.5em;
border-left: 3px solid #dddddd;
}
div.exampleblock > div.content {
border-left: 3px solid #dddddd;
padding-left: 0.5em;
}
div.imageblock div.content { padding-left: 0; }
span.image img { border-style: none; vertical-align: text-bottom; }
a.image:visited { color: white; }
dl {
margin-top: 0.8em;
margin-bottom: 0.8em;
}
dt {
margin-top: 0.5em;
margin-bottom: 0;
font-style: normal;
color: navy;
}
dd > *:first-child {
margin-top: 0.1em;
}
ul, ol {
list-style-position: outside;
}
ol.arabic {
list-style-type: decimal;
}
ol.loweralpha {
list-style-type: lower-alpha;
}
ol.upperalpha {
list-style-type: upper-alpha;
}
ol.lowerroman {
list-style-type: lower-roman;
}
ol.upperroman {
list-style-type: upper-roman;
}
div.compact ul, div.compact ol,
div.compact p, div.compact p,
div.compact div, div.compact div {
margin-top: 0.1em;
margin-bottom: 0.1em;
}
tfoot {
font-weight: bold;
}
td > div.verse {
white-space: pre;
}
div.hdlist {
margin-top: 0.8em;
margin-bottom: 0.8em;
}
div.hdlist tr {
padding-bottom: 15px;
}
dt.hdlist1.strong, td.hdlist1.strong {
font-weight: bold;
}
td.hdlist1 {
vertical-align: top;
font-style: normal;
padding-right: 0.8em;
color: navy;
}
td.hdlist2 {
vertical-align: top;
}
div.hdlist.compact tr {
margin: 0;
padding-bottom: 0;
}
.comment {
background: yellow;
}
.footnote, .footnoteref {
font-size: 0.8em;
}
span.footnote, span.footnoteref {
vertical-align: super;
}
#footnotes {
margin: 20px 0 20px 0;
padding: 7px 0 0 0;
}
#footnotes div.footnote {
margin: 0 0 5px 0;
}
#footnotes hr {
border: none;
border-top: 1px solid silver;
height: 1px;
text-align: left;
margin-left: 0;
width: 20%;
min-width: 100px;
}
div.colist td {
padding-right: 0.5em;
padding-bottom: 0.3em;
vertical-align: top;
}
div.colist td img {
margin-top: 0.3em;
}
@media print {
#footer-badges { display: none; }
}
#toc {
margin-bottom: 2.5em;
}
#toctitle {
color: #527bbd;
font-size: 1.1em;
font-weight: bold;
margin-top: 1.0em;
margin-bottom: 0.1em;
}
div.toclevel0, div.toclevel1, div.toclevel2, div.toclevel3, div.toclevel4 {
margin-top: 0;
margin-bottom: 0;
}
div.toclevel2 {
margin-left: 2em;
font-size: 0.9em;
}
div.toclevel3 {
margin-left: 4em;
font-size: 0.9em;
}
div.toclevel4 {
margin-left: 6em;
font-size: 0.9em;
}
span.aqua { color: aqua; }
span.black { color: black; }
span.blue { color: blue; }
span.fuchsia { color: fuchsia; }
span.gray { color: gray; }
span.green { color: green; }
span.lime { color: lime; }
span.maroon { color: maroon; }
span.navy { color: navy; }
span.olive { color: olive; }
span.purple { color: purple; }
span.red { color: red; }
span.silver { color: silver; }
span.teal { color: teal; }
span.white { color: white; }
span.yellow { color: yellow; }
span.aqua-background { background: aqua; }
span.black-background { background: black; }
span.blue-background { background: blue; }
span.fuchsia-background { background: fuchsia; }
span.gray-background { background: gray; }
span.green-background { background: green; }
span.lime-background { background: lime; }
span.maroon-background { background: maroon; }
span.navy-background { background: navy; }
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<body class="article">
<div id="header">
<h1>Migration Guide for the Next Scripting Language</h1>
<span id="author">Gustaf Neumann</span><br />
<span id="email"><code><<a href="mailto:neumann@wu-wien.ac.at">neumann@wu-wien.ac.at</a>></code></span><br />
<span id="revnumber">version 2.4.0,</span>
<span id="revdate">Aug 2022</span>
<br /><span id="revremark"></span>
<div id="toc">
<div id="toctitle">Table of Contents</div>
<noscript><p><b>JavaScript must be enabled in your browser to display the table of contents.</b></p></noscript>
</div>
</div>
<div id="content">
<div id="preamble">
<div class="sectionbody">
<div class="sidebarblock">
<div class="content">
<div class="title">Abstract</div>
<div class="paragraph"><p>This document describes the differences between the Next Scripting
Language Framework and XOTcl 1. In particular, it presents a
migration guide from XOTcl 1 to NX, and presents potential
incompatibilities between XOTcl 1 and XOTcl 2.</p></div>
</div></div>
<div class="paragraph"><p>The Next Scripting Language (NX) is a successor of XOTcl 1 and is
based on 10 years of experience with XOTcl in projects containing
several hundred thousand lines of code. While XOTcl was the first
language designed to provide language support for design patterns, the
focus of the Next Scripting Framework and NX are on combining this
with Language Oriented Programming. In many respects, NX was designed
to ease the learning of the language by novices (by using a more
mainstream terminology, higher orthogonality of the methods, less
predefined methods), to improve maintainability (remove sources of
common errors) and to encourage developer to write better structured
programs (to provide interfaces) especially for large projects, where
many developers are involved.</p></div>
<div class="paragraph"><p>The Next Scripting Language is based on the Next Scripting Framework
which was developed based on the notion of language oriented
programming. The Next Scripting Frameworks provides C-level support
for defining and hosting multiple object systems in a single Tcl
interpreter. The whole definition of NX is fully scripted
(e.g. defined in <code>nx.tcl</code>). The Next Scripting Framework is shipped
with three language definitions, containing NX and XOTcl 2. Most of
the existing XOTcl 1 programs can be used without modification in the
Next Scripting Framework by using XOTcl 2. The Next Scripting
Framework requires Tcl 8.5 or newer.</p></div>
<div class="paragraph"><p>Although NX is fully scripted (as well as XOTcl 2), our benchmarks
show that scripts based on NX are often 2 or 4 times faster than the
counterparts in XOTcl 1. But speed was not the primary focus on the
Next Scripting Environment: The goal was primarily to find ways to
repackage the power of XOTcl in an easy to learn environment, highly
orthogonal environment, which is better suited for large projects,
trying to reduce maintenance costs.</p></div>
<div class="paragraph"><p>We expect that many users will find it attractive to upgrade
from XOTcl 1 to XOTcl 2, and some other users will upgrade to NX.
This document focuses mainly on the differences between XOTcl 1 and
NX, but addresses as well potential incompatibilities between XOTcl 1
and XOTcl 2. For an introduction to NX, please consult the NX tutorial.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_differences_between_xotcl_and_nx">1. Differences Between XOTcl and NX</h2>
<div class="sectionbody">
<div class="paragraph"><p>The Next Scripting Framework supports <em>Language Oriented Programming</em>
by providing means to define potentially multiple object systems with
different naming and functionality in a single interpreter. This
makes the Next Scripting Framework a powerful instrument for defining
multiple languages such as e.g. domain specific languages. This focus
differs from XOTcl 1.</p></div>
<div class="paragraph"><p>Technically, the language framework approach means that the languages
implemented by the Next Scripting Framework (most prominently XOTcl 2
and NX) are typically fully scripted and can be loaded via the usual
Tcl <code>package require</code> mechanism.</p></div>
<div class="paragraph"><p>Some of the new features below are provided by the Next Scripting
Framework, some are implemented via the script files for XOTcl 2 and
NX.</p></div>
<div class="sect2">
<h3 id="_features_of_nx">1.1. Features of NX</h3>
<div class="paragraph"><p>In general, the Next Scripting Language (NX) differs from XOTcl
in the following respects:</p></div>
<div class="olist arabic"><ol class="arabic">
<li>
<p>
<strong>Stronger Encapsulation:</strong> The Next Scripting Language favors
a <em>stronger form of encapsulation</em> than XOTcl. Calling the own
methods or accessing the own instance variables is typographically
easier and computationally faster than these operations on other
objects. This behavior is achieved via <em>resolvers</em>, which make some
methods necessary in XOTcl 1 obsolete in NX (especially for importing
instance variables). The encapsulation of NX is stronger than in
XOTcl but still weak compared to languages like C++; a developer can
still access other objects' variables via some idioms, but NX <em>makes
accesses to other objects' variables explicit</em>. The requiredness to
make these accesses explicit should encourage developer to implement
well defined interfaces to provide access to instance variables.
</p>
</li>
<li>
<p>
<strong>Additional Forms of Method Definition and Reuse:</strong>
The Next Scripting Language
provides much more orthogonal means to <em>define, reuse and
introspect</em> scripted and C-implemented methods.
</p>
<div class="olist loweralpha"><ol class="loweralpha">
<li>
<p>
It is possible to use NX <code>alias</code> to register methods
under arbitrary names for arbitrary objects or classes.
</p>
</li>
<li>
<p>
NX provides means for <em>method protection</em> (method modifiers
<code>public</code>, <code>protected</code>, and <code>private</code>). Therefore, developers have
to define explicitly public interfaces in order to use methods
from other objects.
</p>
</li>
<li>
<p>
One can invoke in NX fully qualified methods to invoke
methods outside the precedence path.
</p>
</li>
<li>
<p>
One can define in NX <em>hierarchical method names</em> (similar to
commands and subcommands, called method ensembles) in a
convenient way to provide extensible, hierarchical naming of
methods.
</p>
</li>
<li>
<p>
One can use in NX the same interface to query (introspect)
C-implemented and scripted methods/commands.
</p>
</li>
</ol></div>
</li>
<li>
<p>
<strong>Orthogonal Parameterization:</strong>
The Next Scripting Language provides an <em>orthogonal framework for
parameterization</em> of methods and objects.
</p>
<div class="olist loweralpha"><ol class="loweralpha">
<li>
<p>
In NX, the same argument parser is used for
</p>
<div class="ulist"><ul>
<li>
<p>
Scripted Methods
</p>
</li>
<li>
<p>
C-implemented methods and Tcl commands
</p>
</li>
<li>
<p>
Object Parametrization
</p>
</li>
</ul></div>
</li>
<li>
<p>
While XOTcl 1 provided only value-checkers for non-positional
arguments for methods, the Next Scripting Framework provides
the same value checkers for positional and non-positional
arguments of methods, as well as for positional and
non-positional configure parameters (<code>-parameter</code> in
XOTcl 1).
</p>
</li>
<li>
<p>
While XOTcl 1 supported only non-positional arguments at the
begin of the argument list, these can be used now at arbitrary
positions.
</p>
</li>
</ol></div>
</li>
<li>
<p>
<strong>Value Checking:</strong>
</p>
<div class="olist loweralpha"><ol class="loweralpha">
<li>
<p>
The Next Scripting Language supports checking of the <em>input
parameters</em> and the <em>return values</em> of scripted and C-implemented
methods and commands.
</p>
</li>
<li>
<p>
NX provides a set of predefined checkers (like e.g. <code>integer</code>,
<code>boolean</code>, <code>object</code>, …) which can be extended by the
applications.
</p>
</li>
<li>
<p>
Value Checking can be used for <em>single</em> and <em>multi-valued</em>
parameters. One can e.g. define a list of integers
with at least one entry by the parameter specification
<code>integer,1..n</code>.
</p>
</li>
<li>
<p>
Value Checking can be turned on/off globally or on the
method/command level.
</p>
</li>
</ol></div>
</li>
<li>
<p>
<strong>Scripted Init Blocks:</strong> The Next Scripting Language provides
<em>scripted init blocks</em> for objects and classes (replacement for the
dangerous dash "-" mechanism in XOTcl that allows one to set variables
and invoke methods upon object creation).
</p>
</li>
<li>
<p>
<strong>More Conventional Naming for Predefined Methods:</strong> The naming of
the methods in the Next Scripting Language is much more in line with
the mainstream naming conventions in OO languages. While for example
XOTcl uses <code>proc</code> and <code>instproc</code> for object specific and inheritable
methods, NX uses simply <code>method</code>.
</p>
</li>
<li>
<p>
<strong>Profiling Support:</strong> The Next Scripting Language provides now two
forms of profiling
</p>
<div class="ulist"><ul>
<li>
<p>
Profiling via a DTrace provider (examples are e.g. in the dtrace
subdirectory of the source tree)
</p>
</li>
<li>
<p>
Significantly improved built-in profiling (results can be
processed in Tcl).
</p>
</li>
</ul></div>
</li>
<li>
<p>
<strong>Significantly Improved Test Suite:</strong> The regression test suite of
Next Scripting framework contain now more than
5.000 tests, and order of magnitude more than in XOTcl 1.6
</p>
</li>
<li>
<p>
<strong>Much Smaller Interface:</strong> The Next Scripting Language has a much
<em>smaller interface</em> (i.e. provides less predefined methods) than
XOTcl (see Table 1), although the expressiveness was increased in
NX.
</p>
</li>
</ol></div>
<div class="tableblock">
<table rules="all"
width="50%"
frame="hsides"
cellspacing="0" cellpadding="4">
<caption class="title">Table 1. Comparison of the Number of Predefined Methods in NX and XOTcl</caption>
<col width="60%" />
<col width="20%" />
<col width="20%" />
<thead>
<tr>
<th align="left" valign="top"></th>
<th align="right" valign="top">NX</th>
<th align="right" valign="top">XOTcl</th>
</tr>
</thead>
<tfoot>
<tr>
<td align="left" valign="top"><p class="table">Total</p></td>
<td align="right" valign="top"><p class="table">45</p></td>
<td align="right" valign="top"><p class="table">124</p></td>
</tr>
</tfoot>
<tbody>
<tr>
<td align="left" valign="top"><p class="table">Methods for Objects</p></td>
<td align="right" valign="top"><p class="table">14</p></td>
<td align="right" valign="top"><p class="table">51</p></td>
</tr>
<tr>
<td align="left" valign="top"><p class="table">Methods for Classes</p></td>
<td align="right" valign="top"><p class="table">9</p></td>
<td align="right" valign="top"><p class="table">24</p></td>
</tr>
<tr>
<td align="left" valign="top"><p class="table">Info-methods for Objects</p></td>
<td align="right" valign="top"><p class="table">11</p></td>
<td align="right" valign="top"><p class="table">25</p></td>
</tr>
<tr>
<td align="left" valign="top"><p class="table">Info-methods for Classes</p></td>
<td align="right" valign="top"><p class="table">11</p></td>
<td align="right" valign="top"><p class="table">24</p></td>
</tr>
</tbody>
</table>
</div>
<div class="paragraph"><p>This comparison list compares mostly XOTcl 1 with NX, some features
are also available in XOTcl 2 (2a, 2c 2d, 3, 4).</p></div>
</div>
<div class="sect2">
<h3 id="_nx_and_xotcl_scripts">1.2. NX and XOTcl Scripts</h3>
<div class="paragraph"><p>Below is a small, introductory example showing an implementation of a
class <code>Stack</code> in NX and XOTcl. The purpose of this first example is
just a quick overview. We will go into much more detailed comparison
in the next sections.</p></div>
<div class="paragraph"><p>NX supports a block syntax, where the methods are defined during the
creation of the class. The XOTcl syntax is slightly more redundant,
since every definition of a method is a single top-level command
starting with the class name (also NX supports the style used in
XOTcl). In NX, all methods are per default protected (XOTcl does not
support protection). In NX methods are defined in the definition of
the class via <code>:method</code> or <code>:public method</code>. In XOTcl methods are
defined via the <code>instproc</code> method.</p></div>
<div class="paragraph"><p>Another difference is the notation to refer to instance variables. In
NX, instance variable are named with a single colon in the front. In
XOTcl, instance variables are imported using <code>instvar</code>.</p></div>
<div class="tableblock">
<table rules="all"
width="100%"
frame="void"
cellspacing="0" cellpadding="4">
<col width="50%" />
<col width="50%" />
<thead>
<tr>
<th align="left" valign="top">Stack example in NX </th>
<th align="left" valign="top">Stack example in XOTcl</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="top"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
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.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-keyword'>Class</span> <span class='nx-keyword'>create</span> Stack {
<span class='nx-comment'>#
</span> <span class='nx-comment'># Stack of Things
</span> <span class='nx-comment'>#
</span>
<span class='nx-keyword'>:variable</span> things <span class='nx-string'>""</span>
<span class='nx-keyword'>:public</span> <span class='nx-keyword'>method</span> push {thing} {
<span class='nx-keyword'>set</span> :things [<span class='nx-keyword'>linsert</span> <span class='nx-variable'>${</span><span class='nx-variable'>:things}</span> 0 <span class='nx-variable'>$thing</span>]
<span class='nx-keyword'>return</span> <span class='nx-variable'>$thing</span>
}
<span class='nx-keyword'>:public</span> <span class='nx-keyword'>method</span> pop {} {
<span class='nx-keyword'>set</span> top [<span class='nx-keyword'>lindex</span> <span class='nx-variable'>${</span><span class='nx-variable'>:things}</span> 0]
<span class='nx-keyword'>set</span> :things [<span class='nx-keyword'>lrange</span> <span class='nx-variable'>${</span><span class='nx-variable'>:things}</span> 1 end]
<span class='nx-keyword'>return</span> <span class='nx-variable'>$top</span>
}
}</pre></div></div></div></td>
<td align="left" valign="top"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'>#
</span><span class='nx-comment'># Stack of Things
</span><span class='nx-comment'>#
</span>
<span class='nx-keyword'>Class</span> Stack
Stack instproc <span class='nx-keyword'>init</span> {} {
<span class='nx-keyword'>my</span> instvar things
<span class='nx-keyword'>set</span> things <span class='nx-string'>""</span>
}
Stack instproc push {thing} {
<span class='nx-keyword'>my</span> instvar things
<span class='nx-keyword'>set</span> things [<span class='nx-keyword'>linsert</span> <span class='nx-variable'>$things</span> 0 <span class='nx-variable'>$thing</span>]
<span class='nx-keyword'>return</span> <span class='nx-variable'>$thing</span>
}
Stack instproc pop {} {
<span class='nx-keyword'>my</span> instvar things
<span class='nx-keyword'>set</span> top [<span class='nx-keyword'>lindex</span> <span class='nx-variable'>$things</span> 0]
<span class='nx-keyword'>set</span> things [<span class='nx-keyword'>lrange</span> <span class='nx-variable'>$things</span> 1 end]
}</pre></div></div></div></td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="sect2">
<h3 id="_using_xotcl_2_0_and_the_next_scripting_language_in_a_single_interpreter">1.3. Using XOTcl 2.0 and the Next Scripting Language in a Single Interpreter</h3>
<div class="paragraph"><p>In general, the Next Scripting Framework supports multiple object
systems concurrently. Effectively, every object system has different
base classes for creating objects and classes. Therefore, these object
systems can have different interfaces and names of built-in
methods. Currently, the Next Scripting Framework is packaged with
three object systems:</p></div>
<div class="ulist"><ul>
<li>
<p>
NX
</p>
</li>
<li>
<p>
XOTcl 2.0
</p>
</li>
<li>
<p>
TclCool
</p>
</li>
</ul></div>
<div class="paragraph"><p>XOTcl 2 is highly compatible with XOTcl 1, the language NX is
described below in more details, the language TclCool was introduced
in Tip#279 and serves primarily an example of a small OO language.</p></div>
<div class="paragraph"><p>A single Tcl interpreter can host multiple Next Scripting Object
Systems at the same time. This fact makes migration from XOTcl to NX
easier. The following example script shows to use XOTcl and NX in a
single script:</p></div>
<div class="listingblock">
<div class="title">Using Multiple Object Systems in a single Script</div>
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-keyword'>namespace</span> <span class='nx-keyword'>eval</span> mypackage {
<span class='nx-keyword'>package</span> <span class='nx-keyword'>require</span> XOTcl 2.0
<span class='nx-comment'># Define a class with a public method "foo" using XOTcl
</span> <span class='nx-keyword'>xotcl::Class</span> C1
C1 instproc foo {} {<span class='nx-keyword'>puts</span> <span class='nx-string'>"hello world"</span>}
<span class='nx-keyword'>package</span> <span class='nx-keyword'>require</span> nx
<span class='nx-comment'># Define a class with a public method "foo" using NX
</span> <span class='nx-keyword'>nx::Class</span> <span class='nx-keyword'>create</span> C2 {
<span class='nx-keyword'>:public</span> <span class='nx-keyword'>method</span> foo {} {<span class='nx-keyword'>puts</span> <span class='nx-string'>"hello world"</span>}
}
}</pre></div></div>
<div class="paragraph"><p>One could certainly create object or classes from the different object
systems via fully qualified names (e.g. using e.g. <code>::xotcl::Class</code> or
<code>::nx::Class</code>), but for migration for systems without explicit
namespaces switching between the object systems eases migration.
"Switching" between XOTcl and NX effectively means the load some
packages (if needed) and to import either the base classes (Object and
Class) of XOTcl or NX into the current namespace.</p></div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_xotcl_idioms_in_the_next_scripting_language">2. XOTcl Idioms in the Next Scripting Language</h2>
<div class="sectionbody">
<div class="paragraph"><p>The following sections are intended for reader familiar with XOTcl and
show, how certain language Idioms of XOTcl can be expressed in NX. In
some cases, multiple possible realizations are listed</p></div>
<div class="sect2">
<h3 id="_defining_objects_and_classes">2.1. Defining Objects and Classes</h3>
<div class="paragraph"><p>When creating objects or classes, one should use the method <code>create</code>
explicitly. In XOTcl, a default <code>unknown</code> method handler was provided for
classes, which create for every unknown method invocation an
object/class with the name of the invoked method. This technique was
convenient, but as well dangerous, since typos in method names lead
easily to unexpected behavior. This default unknown method handler is not
provided in NX (but can certainly be provided as a one-liner in NX by
the application).</p></div>
<div class="tableblock">
<table rules="all"
width="100%"
frame="void"
cellspacing="0" cellpadding="4">
<col width="50%" />
<col width="50%" />
<thead>
<tr>
<th align="left" valign="middle">XOTcl </th>
<th align="left" valign="middle">Next Scripting Language</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-keyword'>Class</span> ClassName</pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-keyword'>Class</span> <span class='nx-keyword'>create</span> ClassName</pre></div></div></div></td>
</tr>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-keyword'>Object</span> ObjectName</pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-keyword'>Object</span> <span class='nx-keyword'>create</span> ObjectName</pre></div></div></div></td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="sect2">
<h3 id="_defining_methods">2.2. Defining Methods</h3>
<div class="paragraph"><p>In general, both XOTcl and NX support methods on the object level
(per-object methods, i.e. methods only applicable to a single object)
and on the class level (methods inherited to instances of the
classes). While the naming in XOTcl tried to follow closely the Tcl
tradition (using the term <code>proc</code> for functions/methods), NX uses the
term <code>method</code> for defining scripted methods.</p></div>
<div class="paragraph"><p>XOTcl uses the prefix <code>inst</code> to denote that methods are provided for
instances, calling therefore scripted methods for instances
<code>instproc</code>. This is certainly an unusual term. The approach with the
name prefix has the disadvantage, that for every different kind of
method, two names have to be provided (e.g. <code>proc</code> and <code>instproc</code>,
<code>forward</code> and <code>instforward</code>).</p></div>
<div class="paragraph"><p>NX on the contrary uses the same term for defining instance method or
object-specific methods. When the term (e.g. <code>method</code>) is used on a
class, the method will be an instance method (i.e. applicable to the
instances of the class). When the term is used on an object with the
modifier <code>object</code>, an object-specific method is defined. This way one
can define the same way object specific methods on an object as well
as on a class.</p></div>
<div class="paragraph"><p>Furthermore, both XOTcl and NX distinguish between scripted methods
(section 3.2.1) and C-defined methods (section 3.2.2). Section 3.2.3
introduces method protection, which is only supported by NX.</p></div>
<div class="sect3">
<h4 id="_scripted_methods_defined_in_the_init_block_of_a_class_object_or_with_separate_calls">2.2.1. Scripted Methods Defined in the Init-block of a Class/Object or with Separate Calls</h4>
<div class="paragraph"><p>The following examples show the definition of a class and its methods
in the init-block of a class (NX only), and the definition of methods
via separate top-level calls (XOTcl and NX).</p></div>
<div class="tableblock">
<table rules="all"
width="100%"
frame="void"
cellspacing="0" cellpadding="4">
<col width="50%" />
<col width="50%" />
<thead>
<tr>
<th align="left" valign="middle">XOTcl </th>
<th align="left" valign="middle">Next Scripting Language</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Define instance method 'foo' and object
</span><span class='nx-comment'># method 'bar' for a Class 'C' with separate
</span><span class='nx-comment'># top-level commands
</span>
<span class='nx-keyword'>Class</span> C
C instproc foo args {...}
C <span class='nx-keyword'>proc</span> bar args {...}</pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Define instance method and object method
</span><span class='nx-comment'># in the init-block of a class
</span>
<span class='nx-keyword'>Class</span> <span class='nx-keyword'>create</span> C {
<span class='nx-keyword'>:method</span> foo args {...}
<span class='nx-keyword'>:object</span> <span class='nx-keyword'>method</span> bar args {...}
}</pre></div></div>
<div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Define instance method and object method
</span><span class='nx-comment'># with separate commands
</span>
<span class='nx-keyword'>Class</span> <span class='nx-keyword'>create</span> C
C <span class='nx-keyword'>method</span> foo args {...}
C <span class='nx-keyword'>object</span> <span class='nx-keyword'>method</span> bar args {...}</pre></div></div></div></td>
</tr>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Define object-specific method foo
</span><span class='nx-comment'># for an object 'o' with separate commands
</span>
<span class='nx-keyword'>Object</span> o
o <span class='nx-keyword'>set</span> x 1
o <span class='nx-keyword'>proc</span> foo args {...}</pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Define object method and set
</span><span class='nx-comment'># instance variable in the init-block of
</span><span class='nx-comment'># an object
</span>
<span class='nx-keyword'>Object</span> <span class='nx-keyword'>create</span> o {
<span class='nx-keyword'>set</span> :x 1
<span class='nx-keyword'>:object</span> <span class='nx-keyword'>method</span> foo args {...}
}</pre></div></div>
<div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Define object method and set
</span><span class='nx-comment'># instance variable with separate
</span><span class='nx-comment'># commands
</span>
<span class='nx-keyword'>Object</span> <span class='nx-keyword'>create</span> o
o <span class='nx-keyword'>eval</span> {<span class='nx-keyword'>set</span> :x 1}
o <span class='nx-keyword'>object</span> <span class='nx-keyword'>method</span> foo args {...}</pre></div></div></div></td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="sect3">
<h4 id="_different_kinds_of_methods">2.2.2. Different Kinds of Methods</h4>
<div class="paragraph"><p>This section describes various kinds of methods. The different kinds
of methods are defined via different method-defining methods, which
are summarized in the following table for XOTcl and NX.</p></div>
<div class="tableblock">
<table rules="all"
width="100%"
frame="void"
cellspacing="0" cellpadding="4">
<col width="50%" />
<col width="50%" />
<thead>
<tr>
<th align="left" valign="middle">XOTcl </th>
<th align="left" valign="middle">Next Scripting Language</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Methods for defining methods:
</span><span class='nx-comment'>#
</span><span class='nx-comment'># proc
</span><span class='nx-comment'># instproc
</span><span class='nx-comment'># forward
</span><span class='nx-comment'># instforward
</span><span class='nx-comment'># parametercmd
</span><span class='nx-comment'># instparametercmd
</span><span class='nx-comment'>#
</span><span class='nx-comment'># All these methods return empty.</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Methods for defining methods:
</span><span class='nx-comment'>#
</span><span class='nx-comment'># alias
</span><span class='nx-comment'># forward
</span><span class='nx-comment'># method
</span><span class='nx-comment'>#
</span><span class='nx-comment'># All these methods return method-handles.</span></pre></div></div></div></td>
</tr>
</tbody>
</table>
</div>
<div class="paragraph"><p>In addition to scripted methods (previous section) XOTcl supports
forwarder (called <code>forward</code> and <code>instforward</code>) and accessor functions
to variables (called <code>parametercmd</code> and <code>instparametercmd</code>). The
accessor functions are used normally internally when object-specific
parameters are defined (see Section 3.4).</p></div>
<div class="paragraph"><p>In NX forwarders are called <code>forward</code>. NX does not provide a public
available method to define variable accessors like <code>parametercmd</code> in
XOTcl, but use internally the Next Scripting Framework primitive
<code>nsf::method::setter</code> when appropriate.</p></div>
<div class="tableblock">
<table rules="all"
width="100%"
frame="void"
cellspacing="0" cellpadding="4">
<col width="50%" />
<col width="50%" />
<thead>
<tr>
<th align="left" valign="middle">XOTcl </th>
<th align="left" valign="middle">Next Scripting Language</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-keyword'>Class</span> C
C instforward f1 ...
C <span class='nx-keyword'>forward</span> f2 ...
<span class='nx-keyword'>Object</span> o
o <span class='nx-keyword'>forward</span> f3 ...</pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Define forwarder
</span>
<span class='nx-keyword'>Class</span> <span class='nx-keyword'>create</span> C {
<span class='nx-keyword'>:forward</span> f1 ...
<span class='nx-keyword'>:object</span> <span class='nx-keyword'>forward</span> f2 ...
}
<span class='nx-keyword'>Object</span> <span class='nx-keyword'>create</span> o {
<span class='nx-keyword'>:object</span> <span class='nx-keyword'>forward</span> f3 ...
}</pre></div></div></div></td>
</tr>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Define setter and getter methods in XOTcl.
</span><span class='nx-comment'>#
</span><span class='nx-comment'># XOTcl provides methods for these.
</span>
<span class='nx-keyword'>Class</span> C
C instparametercmd p1
C parametercmd p2
<span class='nx-keyword'>Object</span> o
o parametercmd p3</pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Define setter and getter methods in NX.
</span><span class='nx-comment'>#
</span><span class='nx-comment'># NX does not provide own methods, but uses
</span><span class='nx-comment'># the low-level framework commands, since
</span><span class='nx-comment'># application developer will only
</span><span class='nx-comment'># need it in rare cases.
</span>
<span class='nx-keyword'>Class</span> <span class='nx-keyword'>create</span> C
::nsf::method::setter C p1
::nsf::method::setter C -per-object p2
<span class='nx-keyword'>Object</span> <span class='nx-keyword'>create</span> o
::nsf::method::setter o p3</pre></div></div></div></td>
</tr>
</tbody>
</table>
</div>
<div class="paragraph"><p>NX supports in contrary to XOTcl the method <code>alias</code> which can be used
to register arbitrary Tcl commands or methods for an object or class
under a provided method name. Aliases can be used to reuse a certain implementation in
e.g. different object systems under potentially different names. In
some respects aliases are similar to forwarders, but they do not
involve forwarding overhead.</p></div>
<div class="tableblock">
<table rules="all"
width="100%"
frame="void"
cellspacing="0" cellpadding="4">
<col width="50%" />
<col width="50%" />
<thead>
<tr>
<th align="left" valign="middle">XOTcl </th>
<th align="left" valign="middle">Next Scripting Language</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Method "alias" not available</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Define method aliases
</span><span class='nx-comment'># (to scripted or non-scripted methods)
</span>
<span class='nx-keyword'>Class</span> <span class='nx-keyword'>create</span> C {
<span class='nx-keyword'>:alias</span> a1 ...
<span class='nx-keyword'>:object</span> <span class='nx-keyword'>alias</span> a2 ...
}
<span class='nx-keyword'>Object</span> <span class='nx-keyword'>create</span> o {
<span class='nx-keyword'>:object</span> <span class='nx-keyword'>alias</span> a3 ...
}</pre></div></div></div></td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="sect3">
<h4 id="method-protect-example">2.2.3. Method Modifiers and Method Protection</h4>
<div class="paragraph"><p>NX supports four method modifiers <code>object</code>, <code>public</code>, <code>protected</code> and
<code>private</code>. All method modifiers can be written in front of every
method defining command. The method modifier <code>object</code> is used to denote
object-specific methods (see above). The concept of method protection
is new in NX.</p></div>
<div class="tableblock">
<table rules="all"
width="100%"
frame="void"
cellspacing="0" cellpadding="4">
<col width="50%" />
<col width="50%" />
<thead>
<tr>
<th align="left" valign="middle">XOTcl </th>
<th align="left" valign="middle">Next Scripting Language</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Method modifiers
</span><span class='nx-comment'>#
</span><span class='nx-comment'># "object",
</span><span class='nx-comment'># "public",
</span><span class='nx-comment'># "protected", and
</span><span class='nx-comment'># "private"
</span><span class='nx-comment'>#
</span><span class='nx-comment'># are not available</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Method modifiers
</span><span class='nx-comment'>#
</span><span class='nx-comment'># "object",
</span><span class='nx-comment'># "public",
</span><span class='nx-comment'># "protected"
</span><span class='nx-comment'>#
</span><span class='nx-comment'># are applicable for all kinds of
</span><span class='nx-comment'># method defining methods:
</span><span class='nx-comment'>#
</span><span class='nx-comment'># method, forward, alias
</span><span class='nx-comment'>#
</span><span class='nx-comment'># The modifier "private" is available for
</span><span class='nx-comment'>#
</span><span class='nx-comment'># method, forward, alias
</span><span class='nx-comment'>#
</span><span class='nx-keyword'>Class</span> <span class='nx-keyword'>create</span> C {
:/<span class='nx-keyword'>method</span>-definition-method/ ...
<span class='nx-keyword'>:public</span> /<span class='nx-keyword'>method</span>-definition-method/ ...
<span class='nx-keyword'>:protected</span> /<span class='nx-keyword'>method</span>-definition-method/ ...
<span class='nx-keyword'>:private</span> /<span class='nx-keyword'>method</span>-definition-method/ ...
<span class='nx-keyword'>:object</span> /<span class='nx-keyword'>method</span>-definition-method/ ...
<span class='nx-keyword'>:public</span> <span class='nx-keyword'>object</span> /<span class='nx-keyword'>method</span>-definition-method/ ...
<span class='nx-keyword'>:protected</span> <span class='nx-keyword'>object</span> /<span class='nx-keyword'>method</span>-definition-method/ ...
<span class='nx-keyword'>:private</span> <span class='nx-keyword'>object</span> /<span class='nx-keyword'>method</span>-definition-method/ ...
}</pre></div></div></div></td>
</tr>
</tbody>
</table>
</div>
<div class="paragraph"><p>XOTcl does not provide method protection. In NX, all methods are
defined per default as protected. This default can be changed by the
application developer in various ways. The command <code>::nx::configure
defaultMethodCallProtection true|false</code> can be used to set the default
call protection for scripted methods, forwarder and aliases.
The defaults can be overwritten also on a class level.</p></div>
<div class="paragraph"><p>NX provides means for method hiding via the method modifier
<code>private</code>. Hidden methods can be invoked only via the <code>-local</code> flag,
which means: "call the specified method defined in the same
class/object as the currently executing method".</p></div>
<div class="tableblock">
<table rules="all"
width="100%"
frame="void"
cellspacing="0" cellpadding="4">
<col width="50%" />
<col width="50%" />
<thead>
<tr>
<th align="left" valign="middle">XOTcl </th>
<th align="left" valign="middle">Next Scripting Language</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># XOTcl provides no means for
</span><span class='nx-comment'># method hiding</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Hiding of methods via "private"
</span><span class='nx-comment'>#
</span><span class='nx-keyword'>nx::Class</span> <span class='nx-keyword'>create</span> Base {
<span class='nx-keyword'>:private</span> <span class='nx-keyword'>method</span> baz {a b} {<span class='nx-keyword'>expr</span> {<span class='nx-variable'>$a</span> + <span class='nx-variable'>$b</span>}}
<span class='nx-keyword'>:public</span> <span class='nx-keyword'>method</span> foo {a b} {: -local baz <span class='nx-variable'>$a</span> <span class='nx-variable'>$b</span>}
}
<span class='nx-keyword'>nx::Class</span> <span class='nx-keyword'>create</span> Sub -superclass Base {
<span class='nx-keyword'>:public</span> <span class='nx-keyword'>method</span> bar {a b} {: -local baz <span class='nx-variable'>$a</span> <span class='nx-variable'>$b</span>}
<span class='nx-keyword'>:private</span> <span class='nx-keyword'>method</span> baz {a b} {<span class='nx-keyword'>expr</span> {<span class='nx-variable'>$a</span> * <span class='nx-variable'>$b</span>}}
<span class='nx-keyword'>:create</span> s1
}
s1 foo 3 4 ;<span class='nx-comment'># returns 7
</span>s1 bar 3 4 ;<span class='nx-comment'># returns 12
</span>s1 baz 3 4 ;<span class='nx-comment'># unable to dispatch method 'baz'</span></pre></div></div></div></td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="sect3">
<h4 id="method-deletion">2.2.4. Method Deletion</h4>
<div class="paragraph"><p>NX provides an explicit <code>delete</code> method for the deletion of methods.</p></div>
<div class="tableblock">
<table rules="all"
width="100%"
frame="void"
cellspacing="0" cellpadding="4">
<col width="50%" />
<col width="50%" />
<thead>
<tr>
<th align="left" valign="middle">XOTcl </th>
<th align="left" valign="middle">Next Scripting Language</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># XOTcl provides only method deletion with
</span><span class='nx-comment'># the equivalent of Tcl's "proc foo {} {}"
</span><span class='nx-placeholder'>/cls/</span> instproc foo {} {}
<span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>proc</span> foo {} {}</pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Deletion of Methods
</span><span class='nx-comment'>#
</span><span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>delete</span> <span class='nx-keyword'>method</span> <span class='nx-placeholder'>/name/</span>
<span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>delete</span> <span class='nx-keyword'>object</span> <span class='nx-keyword'>method</span> <span class='nx-placeholder'>/name/</span></pre></div></div></div></td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_resolvers">2.3. Resolvers</h3>
<div class="paragraph"><p>The Next Scripting Framework defines Tcl resolvers for method and
variable names to implement object specific behavior. Within the
bodies of scripted methods these resolvers treat variable and function
names starting with a colon <code>:</code> specially. In short, a colon-prefixed
variable name refers to an instance variable, and a colon-prefixed
function name refers to a method. The sub-sections below provide
detailed examples.</p></div>
<div class="paragraph"><p>Note that the resolvers of the Next Scripting Framework can be used in
the XOTcl 2.* environment as well.</p></div>
<div class="sect3">
<h4 id="_invoking_methods">2.3.1. Invoking Methods</h4>
<div class="paragraph"><p>In XOTcl, a method of the same object can be invoked via <code>my</code>, or in
general via using the name of the object in front of the method name.</p></div>
<div class="paragraph"><p>In NX, the own methods are called via the method name prefixed with a
single colon. The invocation of the methods of other objects is the
same in NX and XOTcl.</p></div>
<div class="tableblock">
<table rules="all"
width="100%"
frame="void"
cellspacing="0" cellpadding="4">
<col width="50%" />
<col width="50%" />
<thead>
<tr>
<th align="left" valign="middle">XOTcl </th>
<th align="left" valign="middle">Next Scripting Language</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-keyword'>Class</span> C
C instproc foo args {...}
C instproc bar args {
<span class='nx-keyword'>my</span> foo 1 2 3 ;<span class='nx-comment'># invoke own method
</span> o baz ;<span class='nx-comment'># invoke other object's method
</span>}
<span class='nx-keyword'>Object</span> o
o <span class='nx-keyword'>proc</span> baz {} {...}</pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-keyword'>Class</span> <span class='nx-keyword'>create</span> C {
<span class='nx-keyword'>:method</span> foo args {...}
<span class='nx-keyword'>:method</span> bar args {
:foo 1 2 3 ;<span class='nx-comment'># invoke own method
</span> o baz ;<span class='nx-comment'># invoke other object's method
</span> }
}
<span class='nx-keyword'>Object</span> <span class='nx-keyword'>create</span> o {
<span class='nx-keyword'>:public</span> <span class='nx-keyword'>object</span> <span class='nx-keyword'>method</span> baz {} {...}
}</pre></div></div></div></td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="sect3">
<h4 id="_accessing_own_instance_variables_from_method_bodies">2.3.2. Accessing Own Instance Variables from Method Bodies</h4>
<div class="paragraph"><p>In general, the Next Scripting Language favors the access to an
objects’s own instance variables over variable accesses of other
objects. This means that in NX it is syntactically easier to access
the own instance variables. On the contrary, in XOTcl, the variable
access to own and other variables are fully symmetric.</p></div>
<div class="paragraph"><p>In XOTcl, the following approaches are used to access instance
variables:</p></div>
<div class="ulist"><ul>
<li>
<p>
Import instance variables via <code>instvar</code> and access variables via <code>$varName</code>
</p>
</li>
<li>
<p>
Set or get instance variables via <code>my set varName ?value?</code> or other
variable accessing methods registered on <code>xotcl::Object</code> such as
<code>append</code>, <code>lappend</code>, <code>incr</code>, etc.
</p>
</li>
<li>
<p>
Register same-named accessor functions and set/get values
of instance variables via <code>my varName ?value?</code>
</p>
</li>
</ul></div>
<div class="paragraph"><p>In NX, the favored approach to access instance variables is to use
the name resolvers, although it is as well possible to import
variables via <code>nx::var import</code> or to check for the existence of
instance variables via <code>nx::var exists</code>.</p></div>
<div class="paragraph"><p>The following examples summary the use cases for accessing the own and
other instance variables.</p></div>
<div class="tableblock">
<table rules="all"
width="100%"
frame="void"
cellspacing="0" cellpadding="4">
<col width="50%" />
<col width="50%" />
<thead>
<tr>
<th align="left" valign="middle">XOTcl </th>
<th align="left" valign="middle">Next Scripting Language</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-keyword'>Class</span> C
C instproc foo args {
<span class='nx-comment'># Method scoped variable a
</span> <span class='nx-keyword'>set</span> a 1
<span class='nx-comment'># Instance variable b
</span> <span class='nx-keyword'>my</span> instvar b
<span class='nx-keyword'>set</span> b 2
<span class='nx-comment'># Global variable/namespaced variable c
</span> <span class='nx-keyword'>set</span> ::c 3
}</pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-keyword'>Class</span> <span class='nx-keyword'>create</span> C {
<span class='nx-keyword'>:method</span> foo args {...}
<span class='nx-comment'># Method scoped variable a
</span> <span class='nx-keyword'>set</span> a 1
<span class='nx-comment'># Instance variable b
</span> <span class='nx-keyword'>set</span> :b 2
<span class='nx-comment'># Global variable/namespaced variable c
</span> <span class='nx-keyword'>set</span> ::c 3
}
}</pre></div></div></div></td>
</tr>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'>... instproc ... {
<span class='nx-keyword'>my</span> <span class='nx-keyword'>set</span> <span class='nx-placeholder'>/varName/</span> <span class='nx-placeholder'>?value?</span>
}</pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Set own instance variable to a value via
</span><span class='nx-comment'># resolver (preferred and fastest way)
</span>
... <span class='nx-keyword'>method</span> ... {
<span class='nx-keyword'>set</span> :<span class='nx-placeholder'>/newVar/</span> <span class='nx-placeholder'>?value?</span>
}</pre></div></div></div></td>
</tr>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'>... instproc ... {
<span class='nx-keyword'>my</span> instvar <span class='nx-placeholder'>/varName/</span>
<span class='nx-keyword'>set</span> <span class='nx-placeholder'>/varName/</span> <span class='nx-placeholder'>?value?</span>
}</pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Set own instance variable via
</span><span class='nx-comment'># variable import
</span>
... <span class='nx-keyword'>method</span> ... {
::nx::var import [<span class='nx-keyword'>self</span>] <span class='nx-placeholder'>/varName/</span>
<span class='nx-keyword'>set</span> <span class='nx-placeholder'>/varName/</span> <span class='nx-placeholder'>?value?</span>
}</pre></div></div></div></td>
</tr>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'>... instproc ... {
<span class='nx-keyword'>set</span> <span class='nx-placeholder'>/varName/</span> [<span class='nx-keyword'>my</span> <span class='nx-keyword'>set</span> <span class='nx-placeholder'>/otherVar/</span>]
}</pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Read own instance variable
</span>
... <span class='nx-keyword'>method</span> ... {
<span class='nx-keyword'>set</span> <span class='nx-placeholder'>/varName/</span> [<span class='nx-keyword'>set</span> :<span class='nx-placeholder'>/otherVar/</span>]
}</pre></div></div>
<div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'>... <span class='nx-keyword'>method</span> ... {
<span class='nx-keyword'>set</span> <span class='nx-placeholder'>/newVar/</span> <span class='nx-variable'>${</span><span class='nx-variable'>:/otherVar/}</span>
}</pre></div></div></div></td>
</tr>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'>... instproc ... {
<span class='nx-keyword'>my</span> exists <span class='nx-placeholder'>/varName/</span>
}</pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Test existence of own instance variable
</span>
... <span class='nx-keyword'>method</span> ... {
<span class='nx-keyword'>info</span> :<span class='nx-placeholder'>/varName/</span>
}</pre></div></div>
<div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'> ... <span class='nx-keyword'>method</span> ... {
::nx::var exists [<span class='nx-keyword'>self</span>] <span class='nx-placeholder'>/varName/</span>
}</pre></div></div></div></td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="sect3">
<h4 id="_accessing_instance_variables_of_other_objects">2.3.3. Accessing Instance Variables of other Objects</h4>
<div class="tableblock">
<table rules="all"
width="100%"
frame="void"
cellspacing="0" cellpadding="4">
<col width="50%" />
<col width="50%" />
<thead>
<tr>
<th align="left" valign="middle">XOTcl </th>
<th align="left" valign="middle">Next Scripting Language</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>set</span> <span class='nx-placeholder'>/varName/</span> <span class='nx-placeholder'>?value?</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Set instance variable of object obj to a
</span><span class='nx-comment'># value via resolver
</span><span class='nx-comment'># (preferred way: define property on obj)
</span>
<span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>eval</span> [<span class='nx-keyword'>list</span> <span class='nx-keyword'>set</span> :<span class='nx-placeholder'>/varName/</span> <span class='nx-placeholder'>?value?</span>]</pre></div></div></div></td>
</tr>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-keyword'>set</span> <span class='nx-placeholder'>/varName/</span> [<span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>set</span> <span class='nx-placeholder'>/otherVar/</span>]</pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Read instance variable of object obj
</span><span class='nx-comment'># via resolver
</span>
<span class='nx-keyword'>set</span> <span class='nx-placeholder'>/varName/</span> [<span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>eval</span> {<span class='nx-keyword'>set</span> :<span class='nx-placeholder'>/otherVar/</span>}]</pre></div></div></div></td>
</tr>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'>... instproc ... {
<span class='nx-placeholder'>/obj/</span> instvar <span class='nx-placeholder'>/varName/</span>
<span class='nx-keyword'>set</span> <span class='nx-placeholder'>/varName/</span> <span class='nx-placeholder'>?value?</span>
}</pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Read instance variable of object /obj/
</span><span class='nx-comment'># via import
</span>
... <span class='nx-keyword'>method</span> ... {
::nx::var import <span class='nx-placeholder'>/obj/</span> <span class='nx-placeholder'>/varName/</span>
<span class='nx-keyword'>set</span> <span class='nx-placeholder'>/varName/</span> <span class='nx-placeholder'>?value?</span>
}</pre></div></div></div></td>
</tr>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/obj/</span> exists varName</pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Test existence of instance variable of
</span><span class='nx-comment'># object obj
</span>
<span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>eval</span> {<span class='nx-keyword'>info</span> exists :<span class='nx-placeholder'>/varName/</span>}</pre></div></div>
<div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'>::nx::var exists <span class='nx-placeholder'>/obj/</span> <span class='nx-placeholder'>/varName/</span></pre></div></div></div></td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_parameters">2.4. Parameters</h3>
<div class="paragraph"><p>While XOTcl 1 had very limited forms of parameters, XOTcl 2 and NX
provide a generalized and highly orthogonal parameter machinery
handling various kinds of value constraints (also called value
checkers). Parameters are used to specify,</p></div>
<div class="ulist"><ul>
<li>
<p>
how objects and classes are initialized (we call these parameter types
<em>Configure Parameters</em>), and
</p>
</li>
<li>
<p>
what values can be passed to methods (we call these <em>Method
Parameters</em>).
</p>
</li>
</ul></div>
<div class="paragraph"><p>Furthermore, parameters might be positional or non-positional, they
might be optional or required, they might have a defined multiplicity,
and value-types, they might be introspected, etc. The Next Scripting
Framework provide a unified, C-implemented infrastructure to handle
both, object and method parameters in the same way with a high degree
of orthogonality.</p></div>
<div class="paragraph"><p>Configuration parameters were specified in XOTcl 1 primarily via the
method <code>parameter</code> in a rather limited way, XOTcl 1 only supported
non-positional parameters in front of positional ones, supported no
value constraints for positional parameters, provided no distinction
between optional and required, and did not support multiplicity.</p></div>
<div class="paragraph"><p>Furthermore, the Next Scripting Framework provides optionally <em>Return
Value Checking</em> based on the same mechanism to check whether some
methods return always the values as specified.</p></div>
<div class="sect3">
<h4 id="_parameters_for_configuring_objects_variables_and_properties">2.4.1. Parameters for Configuring Objects: Variables and Properties</h4>
<div class="paragraph"><p>Configure parameters are used for specifying values for configuring
objects when they are created (i.e. how instance variables are
initialized, what parameters can be passed in for initialization, what
default values are used, etc.). Such configuration parameters are
supported in XOTcl primarily via the method <code>parameter</code>, which is used
in XOTcl to define multiple parameters via a list of parameter
specifications.</p></div>
<div class="paragraph"><p>Since the term "parameter" is underspecified, NX uses a more
differentiated terminology. NX distinguishes between configurable
instance variables (also called <em>properties</em>) and non-configurable
instance variables (called <em>variables</em>), which might have as well
e.g. default values. The values of configurable properties can be
queried at run time via <code>cget</code>, and their values can be altered via
<code>configure</code>. When the value of a configure parameter is provided or
changed, the value checkers from the variable definition are used to
ensure, the value is permissible (i.e. it is for example an integer
value). The sum of all configurable object parameters are called
<em>configure parameters</em>. To define a define a configurable variable, NX
uses the method <code>property</code>, for non-configurable variables, the method
<code>variable</code> is used.</p></div>
<div class="paragraph"><p>Optionally, one can define in NX, that a <code>property</code> or a
<code>variable</code> should have a public, protected or private accessor. Such
an accessor is a method with the same name as the variable. In XOTcl,
every <code>parameter</code> defined as well automatically a same-named accessor
method, leading to potential name conflicts with other method names.</p></div>
<div class="paragraph"><p>In the examples below we show the definition of non-configurable
instance variables using <code>variable</code> and <code>property</code>
respectively.</p></div>
<div class="tableblock">
<table rules="all"
width="100%"
frame="void"
cellspacing="0" cellpadding="4">
<col width="50%" />
<col width="50%" />
<thead>
<tr>
<th align="left" valign="middle">XOTcl </th>
<th align="left" valign="middle">Next Scripting Language</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Define class "Foo" with instance
</span><span class='nx-comment'># variables "x" and "y" initialized
</span><span class='nx-comment'># on instance creation. The initialization
</span><span class='nx-comment'># has to be performed in the constructor.
</span>
<span class='nx-keyword'>Class</span> Foo
Foo instproc <span class='nx-keyword'>init</span> args {
instvar x y
<span class='nx-keyword'>set</span> x 1
<span class='nx-keyword'>set</span> y 2
}
<span class='nx-comment'># Create instance of the class Foo
</span>Foo f1
<span class='nx-comment'># Object f1 has instance variables
</span><span class='nx-comment'># x == 1 and y == 2</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Define class "Foo" with instance variables
</span><span class='nx-comment'># "x" and "y" initialized on instance creation.
</span><span class='nx-comment'># The method "variable" is similar in syntax
</span><span class='nx-comment'># to Tcl's "variable" command. During
</span><span class='nx-comment'># instance creation, the variable
</span><span class='nx-comment'># definitions are used for the
</span><span class='nx-comment'># initialization of the variables of the object.
</span>
<span class='nx-keyword'>Class</span> <span class='nx-keyword'>create</span> Foo {
<span class='nx-keyword'>:variable</span> x 1
<span class='nx-keyword'>:variable</span> y 2
}
<span class='nx-comment'># Create instance of the class Foo
</span>Foo <span class='nx-keyword'>create</span> f1
<span class='nx-comment'># Object f1 has instance variables
</span><span class='nx-comment'># x == 1 and y == 2</span></pre></div></div></div></td>
</tr>
</tbody>
</table>
</div>
<div class="paragraph"><p>While XOTcl follows a procedural way to initialize variables via the
constructor <code>init</code>, NX follows a more declarative approach. Often,
classes have superclasses, which often want to provide their own
instance variables and default values. The declarative approach from
NX solves this via inheritance, while a procedural approach via
assign statements in the constructor requires explicit constructor
calls, which are often error-prone. Certainly, when a user prefers to
assign initial values to instance variables via explicit assign
operations in constructors, this is as well possible in NX.</p></div>
<div class="paragraph"><p>NX uses the same mechanism to define class variables or object
variables.</p></div>
<div class="tableblock">
<table rules="all"
width="100%"
frame="void"
cellspacing="0" cellpadding="4">
<col width="50%" />
<col width="50%" />
<thead>
<tr>
<th align="left" valign="middle">XOTcl </th>
<th align="left" valign="middle">Next Scripting Language</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># No syntactic support for creating
</span><span class='nx-comment'># class variables</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'>
<span class='nx-comment'># Define an object variable "V" with value 100 and
</span><span class='nx-comment'># an instance variable "x". "V" is defined for the
</span><span class='nx-comment'># class object Foo, "x" is defined in the
</span><span class='nx-comment'># instances of the class. "object variable" works
</span><span class='nx-comment'># similar to "object method".
</span>
<span class='nx-keyword'>Class</span> <span class='nx-keyword'>create</span> Foo {
<span class='nx-keyword'>:object</span> <span class='nx-keyword'>variable</span> V 100
<span class='nx-keyword'>:variable</span> x 1
}</pre></div></div></div></td>
</tr>
</tbody>
</table>
</div>
<div class="paragraph"><p>In the next step, we define configurable instance variables which we
call <em>properties</em> in NX.</p></div>
<div class="paragraph"><p>XOTcl uses the method <code>parameter</code> is a shortcut for creating multiple
configurable variables with automatically created accessors (methods for
reading and writing of the variables). In NX, the preferred way to
create configurable variables is to use the method <code>property</code>. The
method <code>property</code> in NX is similar to <code>variable</code>, but makes the
variables configurable, which means that</p></div>
<div class="olist arabic"><ol class="arabic">
<li>
<p>
one can specify the property as a non-positional parameter upon
creation of the object,
</p>
</li>
<li>
<p>
one can query the value via the method <code>cget</code>, and
</p>
</li>
<li>
<p>
one can modify the value of the underlying variable via the method
<code>configure</code>.
</p>
</li>
</ol></div>
<div class="tableblock">
<table rules="all"
width="100%"
frame="void"
cellspacing="0" cellpadding="4">
<col width="50%" />
<col width="50%" />
<thead>
<tr>
<th align="left" valign="middle">XOTcl </th>
<th align="left" valign="middle">Next Scripting Language</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Parameters specified as a list
</span><span class='nx-comment'># (short form); parameter
</span><span class='nx-comment'># "a" has no default, "b" has default "1"
</span>
<span class='nx-keyword'>Class</span> Foo -parameter {a {b 1} {c <span class='nx-string'>"[info tclversion]"</span>}}
<span class='nx-comment'># Create instance of the class Foo
</span>Foo f1 -a 0
<span class='nx-comment'># Object f1 has instance variables
</span><span class='nx-comment'># a == 0 and b == 1
</span>
<span class='nx-comment'># XOTcl registers automatically accessors
</span><span class='nx-comment'># for the parameters. Use the accessor
</span><span class='nx-comment'># "b" to output the value of variable "b"
</span><span class='nx-keyword'>puts</span> [f1 b]
<span class='nx-comment'># Use the setter to alter value of
</span><span class='nx-comment'># instance variable "b"
</span>f1 b 100
<span class='nx-comment'># Return the substituted value of
</span><span class='nx-comment'># parameter "c", something like 8.7.
</span><span class='nx-comment'># XOTcl substitutes always when it sees
</span><span class='nx-comment'># square brackets or dollar signs.
</span>f1 c
</pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Define property "a" and "b". The
</span><span class='nx-comment'># property "a" has no default, "b" has
</span><span class='nx-comment'># default value "1"
</span>
<span class='nx-keyword'>Class</span> <span class='nx-keyword'>create</span> Foo {
<span class='nx-keyword'>:property</span> a
<span class='nx-keyword'>:property</span> {b 1}
<span class='nx-keyword'>:property</span> {c <span class='nx-string'>"[info tclversion]"</span>}
<span class='nx-keyword'>:property</span> {d:substdefault <span class='nx-string'>"[info tclversion]"</span>}
}
<span class='nx-comment'># Create instance of the class Foo
</span>Foo <span class='nx-keyword'>create</span> f1 -a 0
<span class='nx-comment'># Object f1 has instance variables
</span><span class='nx-comment'># a == 0 and b == 1
</span>
<span class='nx-comment'># Use the method "cget" to query the value
</span><span class='nx-comment'># of a configuration parameter
</span><span class='nx-keyword'>puts</span> [f1 <span class='nx-keyword'>cget</span> -b]
<span class='nx-comment'># Use the method "configure" to alter the
</span><span class='nx-comment'># value of instance variable "b"
</span>f1 <span class='nx-keyword'>configure</span> -b 100
<span class='nx-comment'># Return the (non-substituted) value of
</span><span class='nx-comment'># parameter "c", and the substituted value
</span><span class='nx-comment'># of parameter "d"
</span>f1 <span class='nx-keyword'>cget</span> -c
f1 <span class='nx-keyword'>cget</span> -d
</pre></div></div></div></td>
</tr>
</tbody>
</table>
</div>
<div class="paragraph"><p>In general, NX allows one to create variables and properties with and
without accessor methods. The created accessor methods might be
<code>public</code>, <code>protected</code> or <code>public</code>. When the value <code>none</code> is provided
to <code>-accessor</code>, no accessor will be created. This is actually the
default in NX. In order to change the default behavior in NX, one can use
<code>::nx::configure defaultAccessor none|public|protected|private</code>.</p></div>
<div class="tableblock">
<table rules="all"
width="100%"
frame="void"
cellspacing="0" cellpadding="4">
<col width="50%" />
<col width="50%" />
<thead>
<tr>
<th align="left" valign="middle">XOTcl </th>
<th align="left" valign="middle">Next Scripting Language</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># "parameter" creates always accessor
</span><span class='nx-comment'># methods, accessor methods are
</span><span class='nx-comment'># always public, no "cget" is available.
</span>
<span class='nx-keyword'>Class</span> <span class='nx-keyword'>create</span> Foo -parameter {a {b 1}}
<span class='nx-comment'># Use the accessor method to query
</span><span class='nx-comment'># the value of a configuration parameter
</span><span class='nx-keyword'>puts</span> [f1 b]
<span class='nx-comment'># Use the accessor method to set the
</span><span class='nx-comment'># value of instance variable "a"
</span>f1 a 100
<span class='nx-comment'># Use the accessor method to unset the
</span><span class='nx-comment'># value of instance variable "a" n.a. via
</span><span class='nx-comment'># accessor</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Define property "a" and "b". The
</span><span class='nx-comment'># property "a" has no default, "b" has
</span><span class='nx-comment'># default value "1"
</span>
<span class='nx-keyword'>Class</span> <span class='nx-keyword'>create</span> Foo {
<span class='nx-keyword'>:variable</span> -accessor <span class='nx-keyword'>public</span> a
<span class='nx-keyword'>:property</span> -accessor <span class='nx-keyword'>public</span> {b 1}
}
<span class='nx-comment'># Use the accessor method to query
</span><span class='nx-comment'># the value of a configuration parameter
</span><span class='nx-keyword'>puts</span> [f1 b get]
<span class='nx-comment'># Use the accessor method to set the
</span><span class='nx-comment'># value of instance variable "a"
</span>f1 a <span class='nx-keyword'>set</span> 100
<span class='nx-comment'># Use the accessor method to unset the
</span><span class='nx-comment'># value of instance variable "a"
</span>f1 a <span class='nx-keyword'>unset</span></pre></div></div></div></td>
</tr>
</tbody>
</table>
</div>
<div class="paragraph"><p>Similar to <code>variable</code>, properties can be defined in NX on the class
and on the object level.</p></div>
<div class="tableblock">
<table rules="all"
width="100%"
frame="void"
cellspacing="0" cellpadding="4">
<col width="50%" />
<col width="50%" />
<thead>
<tr>
<th align="left" valign="middle">XOTcl </th>
<th align="left" valign="middle">Next Scripting Language</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># XOTcl provides no means to define
</span><span class='nx-comment'># configurable variables at the object
</span><span class='nx-comment'># level</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Define class with a property for the class object
</span><span class='nx-comment'># named "cp". This is similar to "static variables"
</span><span class='nx-comment'># in some other object-oriented programming
</span><span class='nx-comment'># languages.
</span>
<span class='nx-keyword'>Class</span> <span class='nx-keyword'>create</span> Foo {
...
<span class='nx-keyword'>:object</span> <span class='nx-keyword'>property</span> cp 101
}
<span class='nx-comment'># Define object property "op"
</span>
<span class='nx-keyword'>Object</span> <span class='nx-keyword'>create</span> o {
<span class='nx-keyword'>:object</span> <span class='nx-keyword'>property</span> op 102
}</pre></div></div></div></td>
</tr>
</tbody>
</table>
</div>
<div class="paragraph"><p>NX supports <em>value constraints</em> (value-checkers) for object and method
parameters in an orthogonal manner. NX provides a predefined set of
value checkers, which can be extended by the application developer.
In NX, the <em>value checking is optional</em>. This means that it is possible to
develop e.g. which a large amount of value-checking and deploy the
script with value checking turned off, if the script is highly
performance sensitive.</p></div>
<div class="tableblock">
<table rules="all"
width="100%"
frame="void"
cellspacing="0" cellpadding="4">
<col width="50%" />
<col width="50%" />
<thead>
<tr>
<th align="left" valign="middle">XOTcl </th>
<th align="left" valign="middle">Next Scripting Language</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># No value constraints for
</span><span class='nx-comment'># parameter available</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Predefined value constraints:
</span><span class='nx-comment'># object, class, alnum, alpha, ascii, boolean,
</span><span class='nx-comment'># control, digit, double, false, graph, integer,
</span><span class='nx-comment'># lower, parameter, print, punct, space, true,
</span><span class='nx-comment'># upper, wordchar, xdigit
</span><span class='nx-comment'>#
</span><span class='nx-comment'># User defined value constraints are possible.
</span><span class='nx-comment'># All parameter value checkers can be turned on
</span><span class='nx-comment'># and off at run time.
</span><span class='nx-comment'>#
</span><span class='nx-comment'># Define a required boolean property "a"
</span><span class='nx-comment'># and an integer property "b" with a default.
</span><span class='nx-comment'># The first definition uses "properties",
</span><span class='nx-comment'># the second definition uses multiple
</span><span class='nx-comment'># "property" statements.
</span>
<span class='nx-keyword'>Class</span> <span class='nx-keyword'>create</span> Foo -properties {
a:boolean
{b:integer 1}
}</pre></div></div>
<div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-keyword'>Class</span> <span class='nx-keyword'>create</span> Foo {
<span class='nx-keyword'>:property</span> a:boolean
<span class='nx-keyword'>:property</span> {b:integer 1}
}</pre></div></div></div></td>
</tr>
</tbody>
</table>
</div>
<div class="paragraph"><p>In XOTcl all configure parameters were <em>optional</em>. Required parameters have
to be passed to the constructor of the object.</p></div>
<div class="paragraph"><p>NX allows one to define <em>optional</em> and <em>required</em> configure parameters (as
well as method parameters). Therefore, configure parameters can be used
as the single mechanism to parameterize objects. It is in NX not
necessary (and per default not possible) to pass arguments to the
constructor.</p></div>
<div class="tableblock">
<table rules="all"
width="100%"
frame="void"
cellspacing="0" cellpadding="4">
<col width="50%" />
<col width="50%" />
<thead>
<tr>
<th align="left" valign="middle">XOTcl </th>
<th align="left" valign="middle">Next Scripting Language</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Required parameter not available</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Required parameter:
</span><span class='nx-comment'># Define a required property "a" and a
</span><span class='nx-comment'># required boolean property "b"
</span>
<span class='nx-keyword'>Class</span> <span class='nx-keyword'>create</span> Foo -properties {
a:required
b:boolean,required
}</pre></div></div>
<div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'>
<span class='nx-keyword'>Class</span> <span class='nx-keyword'>create</span> Foo {
<span class='nx-keyword'>:property</span> a:required
<span class='nx-keyword'>:property</span> b:boolean,required
}</pre></div></div></div></td>
</tr>
</tbody>
</table>
</div>
<div class="paragraph"><p>NX supports in contrary to XOTcl to define the <em>multiplicity</em> of values
per parameter. In NX, one can specify that a parameter can accept the
value "" (empty) in addition to e.g. an integer, or one can specify that the
value is an empty or nonempty list of values via the multiplicity. For
every specified value, the value checkers are applied.</p></div>
<div class="tableblock">
<table rules="all"
width="100%"
frame="void"
cellspacing="0" cellpadding="4">
<col width="50%" />
<col width="50%" />
<thead>
<tr>
<th align="left" valign="middle">XOTcl </th>
<th align="left" valign="middle">Next Scripting Language</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Multiplicity for parameter
</span><span class='nx-comment'># not available</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Parameter with multiplicity
</span><span class='nx-comment'># ints is a list of integers, with default
</span><span class='nx-comment'># objs is a nonempty list of objects
</span><span class='nx-comment'># obj is a single object, maybe empty
</span>
<span class='nx-keyword'>Class</span> <span class='nx-keyword'>create</span> Foo -properties {
{ints:integer,0..n <span class='nx-string'>""</span>}
objs<span class='nx-keyword'>:object</span>,1..n
obj<span class='nx-keyword'>:object</span>,0..1
}</pre></div></div>
<div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-keyword'>Class</span> <span class='nx-keyword'>create</span> Foo {
<span class='nx-keyword'>:property</span> {ints:integer,0..n <span class='nx-string'>""</span>}
<span class='nx-keyword'>:property</span> objs<span class='nx-keyword'>:object</span>,1..n
<span class='nx-keyword'>:property</span> obj<span class='nx-keyword'>:object</span>,0..1
}</pre></div></div></div></td>
</tr>
</tbody>
</table>
</div>
<div class="paragraph"><p>For the implementation of variables and properties, NX uses slot
objects, which are an extension to the <code>-slots</code> already available in
XOTcl. While very for every <code>property</code> in NX, a slot object is created,
for performance reasons, not every <code>variable</code> has a slot associated.</p></div>
<div class="paragraph"><p>When a property is created, NX does actually three things:</p></div>
<div class="olist arabic"><ol class="arabic">
<li>
<p>
Create a slot object, which can be specified in more detail
using the init-block of the slot object
</p>
</li>
<li>
<p>
Create a parameter definition for the initialization of the
object (usable via a non-positional parameter during object
creation), and
</p>
</li>
<li>
<p>
register optionally an accessor function (setter), for which the usual
protection levels (<code>public</code>, <code>protected</code> or <code>private</code>) can be used.
</p>
</li>
</ol></div>
<div class="tableblock">
<table rules="all"
width="100%"
frame="void"
cellspacing="0" cellpadding="4">
<col width="50%" />
<col width="50%" />
<thead>
<tr>
<th align="left" valign="middle">XOTcl </th>
<th align="left" valign="middle">Next Scripting Language</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Define parameters via slots
</span>
<span class='nx-keyword'>Class</span> Foo -slots {
<span class='nx-keyword'>Attribute</span> a
<span class='nx-keyword'>Attribute</span> b -default 1
}
<span class='nx-comment'># Create instance of the class Foo
</span><span class='nx-comment'># and provide a value for instance
</span><span class='nx-comment'># variable "a"
</span>Foo f1 -a 0
<span class='nx-comment'># Object f1 has a == 0 and b == 1</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Configurable parameters specified via the
</span><span class='nx-comment'># method "property" (supports method
</span><span class='nx-comment'># modifiers and scripted configuration;
</span><span class='nx-comment'># see below)
</span>
<span class='nx-keyword'>Class</span> <span class='nx-keyword'>create</span> Foo {
<span class='nx-keyword'>:property</span> a
<span class='nx-keyword'>:property</span> {b 1}
}
<span class='nx-comment'># Create instance of the class Foo and
</span><span class='nx-comment'># provide a value for instance variable "a"
</span>Foo <span class='nx-keyword'>create</span> f1 -a 0
<span class='nx-comment'># Object f1 has a == 0 and b == 1</span></pre></div></div></div></td>
</tr>
</tbody>
</table>
</div>
<div class="paragraph"><p>Since the slots are objects, the slot objects can be configured and
parameterized like every other object in NX. Slot objects can be
provided with a scripted initialization as well. We show first the
definition of properties similar to the functionality provided as well
by XOTcl and show afterwards how to use value constraints, optional
parameters, etc. in NX.</p></div>
<div class="tableblock">
<table rules="all"
width="100%"
frame="void"
cellspacing="0" cellpadding="4">
<col width="50%" />
<col width="50%" />
<thead>
<tr>
<th align="left" valign="middle">XOTcl </th>
<th align="left" valign="middle">Next Scripting Language</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Define parameter with an
</span><span class='nx-comment'># attribute-specific type checker
</span>
<span class='nx-keyword'>Class</span> Person -slots {
<span class='nx-keyword'>Attribute</span> <span class='nx-keyword'>create</span> sex -type <span class='nx-string'>"sex"</span> {
<span class='nx-keyword'>my</span> <span class='nx-keyword'>proc</span> type=sex {name value} {
<span class='nx-keyword'>switch</span> -glob <span class='nx-variable'>$value</span> {
m* {<span class='nx-keyword'>return</span> m}
f* {<span class='nx-keyword'>return</span> f}
default {
<span class='nx-keyword'>error</span> <span class='nx-string'>"expected sex but got $value"</span>
}
}
}
}
}</pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Configure parameter with scripted
</span><span class='nx-comment'># definition (init-block), defining a
</span><span class='nx-comment'># property specific type checker
</span>
<span class='nx-keyword'>Class</span> <span class='nx-keyword'>create</span> Person {
<span class='nx-keyword'>:property</span> -accessor <span class='nx-keyword'>public</span> sex:sex,convert {
<span class='nx-comment'># define a converter to standardize representation
</span> <span class='nx-keyword'>:object</span> <span class='nx-keyword'>method</span> type=sex {name value} {
<span class='nx-keyword'>switch</span> -glob <span class='nx-variable'>$value</span> {
m* {<span class='nx-keyword'>return</span> m}
f* {<span class='nx-keyword'>return</span> f}
default {<span class='nx-keyword'>error</span> <span class='nx-string'>"expected sex but got $value"</span>}
}
}
}
}</pre></div></div></div></td>
</tr>
</tbody>
</table>
</div>
<div class="paragraph"><p>The parameters provided by a class for the initialization of
instances can be introspected via querying the parameters
of the method create: <code>/cls/ info lookup parameters create</code>
(see <a href="#info_configure_parameter">[info_configure_parameter]</a>).</p></div>
</div>
<div class="sect3">
<h4 id="_delete_variable_handlers">2.4.2. Delete Variable Handlers</h4>
<div class="tableblock">
<table rules="all"
width="100%"
frame="void"
cellspacing="0" cellpadding="4">
<col width="50%" />
<col width="50%" />
<thead>
<tr>
<th align="left" valign="middle">XOTcl </th>
<th align="left" valign="middle">Next Scripting Language</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># No syntactic support for deleting
</span><span class='nx-comment'># variable handlers</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Like deletion of Methods:
</span><span class='nx-comment'># Delete on the object, where the
</span><span class='nx-comment'># variable handler is defined.
</span>
<span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>delete</span> <span class='nx-keyword'>property</span> <span class='nx-placeholder'>/name/</span>
<span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>delete</span> <span class='nx-keyword'>object</span> <span class='nx-keyword'>property</span> <span class='nx-placeholder'>/name/</span>
<span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>delete</span> <span class='nx-keyword'>variable</span> <span class='nx-placeholder'>/name/</span>
<span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>delete</span> <span class='nx-keyword'>object</span> <span class='nx-keyword'>variable</span> <span class='nx-placeholder'>/name/</span></pre></div></div></div></td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="sect3">
<h4 id="_method_parameters">2.4.3. Method Parameters</h4>
<div class="paragraph"><p>Method parameters are used to specify the interface of a single method
(what kind of values may be passed to a method, what default values
are provided etc.). The method parameters specifications in XOTcl 1
were limited and allowed only value constraints for non-positional
arguments.</p></div>
<div class="paragraph"><p>NX and XOTcl 2 provide value constraints for all kind of method parameters.
While XOTcl 1 required non-positional arguments to be listed in front of
positional arguments, this limitation is lifted in XOTcl 2.</p></div>
<div class="tableblock">
<table rules="all"
width="100%"
frame="void"
cellspacing="0" cellpadding="4">
<col width="50%" />
<col width="50%" />
<thead>
<tr>
<th align="left" valign="middle">XOTcl </th>
<th align="left" valign="middle">Next Scripting Language</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Define method foo with non-positional
</span><span class='nx-comment'># parameters (x, y and y) and positional
</span><span class='nx-comment'># parameter (a and b)
</span>
<span class='nx-keyword'>Class</span> C
C instproc foo {
-x:integer
-y:required
-z
a
b
} {
<span class='nx-comment'># ...
</span>}
C <span class='nx-keyword'>create</span> c1
<span class='nx-comment'># invoke method foo
</span>c1 foo -x 1 -y a 2 3</pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Define method foo with
</span><span class='nx-comment'># non-positional parameters
</span><span class='nx-comment'># (x, y and y) and positional
</span><span class='nx-comment'># parameter (a and b)
</span>
<span class='nx-keyword'>Class</span> <span class='nx-keyword'>create</span> C {
<span class='nx-keyword'>:public</span> <span class='nx-keyword'>method</span> foo {
-x:integer
-y:required
-z
a
b
} {
<span class='nx-comment'># ...
</span> }
<span class='nx-keyword'>:create</span> c1
}
<span class='nx-comment'># invoke method foo
</span>c1 foo -x 1 -y a 2 3</pre></div></div></div></td>
</tr>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Only leading non-positional
</span><span class='nx-comment'># parameters are available; no
</span><span class='nx-comment'># optional positional parameters,
</span><span class='nx-comment'># no value constraints on
</span><span class='nx-comment'># positional parameters,
</span><span class='nx-comment'># no multiplicity, ...</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Define various forms of parameters
</span><span class='nx-comment'># not available in XOTcl 1
</span>
<span class='nx-keyword'>Class</span> <span class='nx-keyword'>create</span> C {
<span class='nx-comment'># trailing (or interleaved) non-positional
</span> <span class='nx-comment'># parameters
</span> <span class='nx-keyword'>:public</span> <span class='nx-keyword'>method</span> m1 {a b -x:integer -y} {
<span class='nx-comment'># ...
</span> }
<span class='nx-comment'># positional parameters with value constraints
</span> <span class='nx-keyword'>:public</span> <span class='nx-keyword'>method</span> m2 {a:integer b:boolean} {
<span class='nx-comment'>#...
</span> }
<span class='nx-comment'># optional positional parameter (trailing)
</span> <span class='nx-keyword'>:public</span> <span class='nx-keyword'>method</span> <span class='nx-keyword'>set</span> {varName value:optional} {
<span class='nx-comment'># ....
</span> }
<span class='nx-comment'># parameter with multiplicity
</span> <span class='nx-keyword'>:public</span> <span class='nx-keyword'>method</span> m3 {-objs<span class='nx-keyword'>:object</span>,1..n c<span class='nx-keyword'>:class</span>,0..1} {
<span class='nx-comment'># ...
</span> }
<span class='nx-comment'># In general, the same list of value
</span> <span class='nx-comment'># constraints as for configure parameter is
</span> <span class='nx-comment'># available (see above).
</span> <span class='nx-comment'>#
</span> <span class='nx-comment'># User defined value constraints are
</span> <span class='nx-comment'># possible. All parameter value checkers
</span> <span class='nx-comment'># can be turned on and off.
</span>}</pre></div></div></div></td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="sect3">
<h4 id="_return_value_checking">2.4.4. Return Value Checking</h4>
<div class="paragraph"><p><em>Return value checking</em> is a functionality available in the Next
Scripting Framework, that was not yet available in XOTcl 1. A return
value checker assures that a method returns always a value satisfying
some value constraints. Return value checkers can be defined on all
forms of methods (scripted or C-implemented). Like for other value
checkers, return value checkers can be turned on and off.</p></div>
<div class="tableblock">
<table rules="all"
width="100%"
frame="void"
cellspacing="0" cellpadding="4">
<col width="50%" />
<col width="50%" />
<thead>
<tr>
<th align="left" valign="middle">XOTcl </th>
<th align="left" valign="middle">Next Scripting Language</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># No return value checking
</span><span class='nx-comment'># available</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Define method foo with non-positional
</span><span class='nx-comment'># parameters (x, y and y) and positional
</span><span class='nx-comment'># parameter (a and b)
</span>
<span class='nx-keyword'>Class</span> <span class='nx-keyword'>create</span> C {
<span class='nx-comment'># Define method foo which returns an
</span> <span class='nx-comment'># integer value
</span> <span class='nx-keyword'>:method</span> foo -returns integer {-x:integer} {
<span class='nx-comment'># ...
</span> }
<span class='nx-comment'># Define an alias for the Tcl command ::incr
</span> <span class='nx-comment'># and assure, it always returns an integer
</span> <span class='nx-comment'># value
</span> <span class='nx-keyword'>:alias</span> <span class='nx-keyword'>incr</span> -returns integer ::incr
<span class='nx-comment'># Define a forwarder that has to return an
</span> <span class='nx-comment'># integer value
</span> <span class='nx-keyword'>:forward</span> ++ -returns integer ::expr 1 +
<span class='nx-comment'># Define a method that has to return a
</span> <span class='nx-comment'># nonempty list of objects
</span> <span class='nx-keyword'>:public</span> <span class='nx-keyword'>object</span> <span class='nx-keyword'>method</span> instances {} \
-returns <span class='nx-keyword'>object</span>,1..n {
<span class='nx-keyword'>return</span> [<span class='nx-keyword'>:info</span> instances]
}
}</pre></div></div></div></td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_interceptors">2.5. Interceptors</h3>
<div class="paragraph"><p>XOTcl and NX allow the definition of the same set of interceptors,
namely class- and object-level mixins and class- and object-level
filters. The primary difference in NX is the naming, since NX abandons
the prefix "inst" from the names of instance specific method, but uses
the modifier <code>object</code>" for object specific methods.</p></div>
<div class="paragraph"><p>Therefore, in NX, if a <code>mixin</code> is registered on a class-level, it is
applicable for the instances (a per-class mixin), and if and <code>object
mixin</code> is registered, it is a per-object mixin. In both cases, the
term <code>mixin</code> is used, in the second case with the modifier
<code>object</code>. As in all other cases, one can register the same way a
per-object mixin on a plain object or on a class object.</p></div>
<div class="sect3">
<h4 id="_register_mixin_classes_and_mixin_guards">2.5.1. Register Mixin Classes and Mixin Guards</h4>
<div class="tableblock">
<table rules="all"
width="100%"
frame="void"
cellspacing="0" cellpadding="4">
<col width="50%" />
<col width="50%" />
<thead>
<tr>
<th align="left" valign="middle">XOTcl </th>
<th align="left" valign="middle">Next Scripting Language</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/cls/</span> instmixin ...
<span class='nx-placeholder'>/cls/</span> instmixinguard /<span class='nx-keyword'>mixin</span>/ <span class='nx-placeholder'>?condition?</span>
<span class='nx-comment'># Query per-class mixin
</span><span class='nx-placeholder'>/cls/</span> instmixin</pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Register/clear per-class mixin and guard for
</span><span class='nx-comment'># a class
</span>
<span class='nx-placeholder'>/cls/</span> mixins add|<span class='nx-keyword'>set</span>|clear ...
<span class='nx-placeholder'>/cls/</span> mixins <span class='nx-keyword'>guard</span> /<span class='nx-keyword'>mixin</span>/ <span class='nx-placeholder'>?condition?</span>
<span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>configure</span> -mixin ...
<span class='nx-comment'># Query per-class mixins
</span><span class='nx-placeholder'>/cls/</span> mixins get
<span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>cget</span> -mixins
<span class='nx-comment'># Query per-class mixins (without guards)
</span><span class='nx-placeholder'>/cls/</span> mixins classes</pre></div></div></div></td>
</tr>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>mixin</span> ...
<span class='nx-placeholder'>/obj/</span> mixinguard /<span class='nx-keyword'>mixin</span>/ <span class='nx-placeholder'>?condition?</span>
<span class='nx-comment'># Query per-object mixins
</span><span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>mixin</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Register/clear per-object mixin and guard for
</span><span class='nx-comment'># an object
</span>
<span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>object</span> mixins add|<span class='nx-keyword'>set</span>|clear ...
<span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>object</span> mixins <span class='nx-keyword'>guard</span> /<span class='nx-keyword'>mixin</span>/ <span class='nx-placeholder'>?condition?</span>
<span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>configure</span> -object-mixins ...
<span class='nx-comment'># Query per-object mixin
</span><span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>object</span> mixins get
<span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>cget</span> -object-mixin
<span class='nx-comment'># Query per-object mixins (without guards)
</span><span class='nx-placeholder'>/cls/</span> mixins classes</pre></div></div></div></td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="sect3">
<h4 id="_register_filters_and_filter_guards">2.5.2. Register Filters and Filter Guards</h4>
<div class="tableblock">
<table rules="all"
width="100%"
frame="void"
cellspacing="0" cellpadding="4">
<col width="50%" />
<col width="50%" />
<thead>
<tr>
<th align="left" valign="middle">XOTcl </th>
<th align="left" valign="middle">Next Scripting Language</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Register per-class filter and guard for
</span><span class='nx-comment'># a class
</span><span class='nx-placeholder'>/cls/</span> instfilter ...
<span class='nx-placeholder'>/cls/</span> instfilterguard /<span class='nx-keyword'>filter</span>/ <span class='nx-placeholder'>?condition?</span>
<span class='nx-comment'># Query per-class filter
</span><span class='nx-placeholder'>/cls/</span> instfilter</pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Register/clear per-class filter and guard for
</span><span class='nx-comment'># a class
</span>
<span class='nx-placeholder'>/cls/</span> filters add|<span class='nx-keyword'>set</span>|clear ...
<span class='nx-placeholder'>/cls/</span> filters <span class='nx-keyword'>guard</span> /<span class='nx-keyword'>filter</span>/ <span class='nx-placeholder'>?condition?</span>
<span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>configure</span> -filters ...
<span class='nx-comment'># Query per-class filters
</span><span class='nx-placeholder'>/cls/</span> filters get
<span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>cget</span> -filters
<span class='nx-comment'># Query per-class filters (without guards)
</span><span class='nx-placeholder'>/cls/</span> filters <span class='nx-keyword'>methods</span></pre></div></div></div></td>
</tr>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>filter</span> ...
<span class='nx-placeholder'>/obj/</span> filterguard /<span class='nx-keyword'>filter</span>/ <span class='nx-placeholder'>?condition?</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Register(clear per-object filter and guard for
</span><span class='nx-comment'># an object
</span>
<span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>object</span> filters add|<span class='nx-keyword'>set</span>|clear ...
<span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>object</span> filters <span class='nx-keyword'>guard</span> /<span class='nx-keyword'>filter</span>/ <span class='nx-placeholder'>?condition?</span>
<span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>configure</span> -object-filters ...
<span class='nx-comment'># Query per-object filters
</span><span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>object</span> filters get
<span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>cget</span> -object-filters
<span class='nx-comment'># Query per-object filters (without guards)
</span><span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>object</span> filters <span class='nx-keyword'>methods</span></pre></div></div></div></td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_introspection">2.6. Introspection</h3>
<div class="paragraph"><p>In general, introspection in NX became more orthogonal and less
dependent on the type of the method. In XOTcl it was e.g. necessary
that a developer had to know, whether a method is e.g. scripted or not
and has to use accordingly different sub-methods of <code>info</code>.</p></div>
<div class="paragraph"><p>In NX, one can use e.g. always <code>info method</code> with a subcommand and the
framework tries to hide the differences as far as possible. So, one
can for example obtain with <code>info method parameter</code> the parameters of
scripted and C-implemented methods the same way, one can get the
definition of all methods via <code>info method definition</code> and one can get
an manual-like interface description via <code>info method
syntax</code>. In addition, NX provides means to query the type of
a method, and NX allows one to filter by the type of the method.</p></div>
<div class="sect3">
<h4 id="_list_sub_and_superclass_relations">2.6.1. List sub- and superclass relations</h4>
<div class="paragraph"><p>While XOTcl used singular words for introspecting sub- and superclass
relations, NX uses plural word to indicate that potentially a list of
values is returned.</p></div>
<div class="tableblock">
<table rules="all"
width="100%"
frame="void"
cellspacing="0" cellpadding="4">
<col width="50%" />
<col width="50%" />
<thead>
<tr>
<th align="left" valign="middle">XOTcl </th>
<th align="left" valign="middle">Next Scripting Language</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>superclass</span> <span class='nx-placeholder'>?pattern?</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>info</span> superclasses <span class='nx-placeholder'>?pattern?</span></pre></div></div></div></td>
</tr>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>info</span> subclass <span class='nx-placeholder'>?pattern?</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>info</span> subclasses -type setter <span class='nx-placeholder'>?pattern?</span></pre></div></div></div></td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="sect3">
<h4 id="_list_methods_defined_by_classes">2.6.2. List methods defined by classes</h4>
<div class="paragraph"><p>While XOTcl uses different names for obtaining different kinds of
methods defined by a class, NX uses <code>info methods</code> in an orthogonal
manner. NX allows as well to use the call protection to filter the
returned methods.</p></div>
<div class="tableblock">
<table rules="all"
width="100%"
frame="void"
cellspacing="0" cellpadding="4">
<col width="50%" />
<col width="50%" />
<thead>
<tr>
<th align="left" valign="middle">XOTcl </th>
<th align="left" valign="middle">Next Scripting Language</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>info</span> instcommands <span class='nx-placeholder'>?pattern?</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>methods</span> <span class='nx-placeholder'>?pattern?</span></pre></div></div></div></td>
</tr>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>info</span> instparametercmd <span class='nx-placeholder'>?pattern?</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>methods</span> -type setter <span class='nx-placeholder'>?pattern?</span></pre></div></div></div></td>
</tr>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>info</span> instprocs <span class='nx-placeholder'>?pattern?</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>methods</span> -type scripted <span class='nx-placeholder'>?pattern?</span></pre></div></div></div></td>
</tr>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># n.a.</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>methods</span> -type <span class='nx-keyword'>alias</span> <span class='nx-placeholder'>?pattern?</span>
<span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>methods</span> -type forwarder <span class='nx-placeholder'>?pattern?</span>
<span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>methods</span> -type <span class='nx-keyword'>object</span> <span class='nx-placeholder'>?pattern?</span>
<span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>methods</span> -callprotection <span class='nx-keyword'>public</span>|<span class='nx-keyword'>protected</span> ...</pre></div></div></div></td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="sect3">
<h4 id="_list_methods_defined_by_objects">2.6.3. List methods defined by objects</h4>
<div class="paragraph"><p>While XOTcl uses different names for obtaining different kinds of
methods defined by an object, NX uses <code>info methods</code> in an orthogonal
manner. NX allows as well to use the call protection to filter the
returned methods.</p></div>
<div class="tableblock">
<table rules="all"
width="100%"
frame="void"
cellspacing="0" cellpadding="4">
<col width="50%" />
<col width="50%" />
<thead>
<tr>
<th align="left" valign="middle">XOTcl </th>
<th align="left" valign="middle">Next Scripting Language</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> commands <span class='nx-placeholder'>?pattern?</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>object</span> <span class='nx-keyword'>methods</span> <span class='nx-placeholder'>?pattern?</span></pre></div></div></div></td>
</tr>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> parametercmd <span class='nx-placeholder'>?pattern?</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>object</span> <span class='nx-keyword'>methods</span> -type setter <span class='nx-placeholder'>?pattern?</span></pre></div></div></div></td>
</tr>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> procs <span class='nx-placeholder'>?pattern?</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>object</span> <span class='nx-keyword'>methods</span> -type scripted <span class='nx-placeholder'>?pattern?</span></pre></div></div></div></td>
</tr>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># n.a.</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>object</span> <span class='nx-keyword'>methods</span> -type <span class='nx-keyword'>alias</span> <span class='nx-placeholder'>?pattern?</span>
<span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>object</span> <span class='nx-keyword'>methods</span> -type forwarder <span class='nx-placeholder'>?pattern?</span>
<span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>object</span> <span class='nx-keyword'>methods</span> -type <span class='nx-keyword'>object</span> <span class='nx-placeholder'>?pattern?</span>
<span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>object</span> <span class='nx-keyword'>methods</span> -callprotection <span class='nx-keyword'>public</span>|<span class='nx-keyword'>protected</span> ...</pre></div></div></div></td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="sect3">
<h4 id="_check_existence_of_a_method">2.6.4. Check existence of a method</h4>
<div class="paragraph"><p>NX provides multiple ways of checking, whether a method exists; one
can use <code>info method exists</code> to check, if a given method exists
(return boolean), or one can use <code>info methods ?pattern?</code>, where
<code>pattern</code> might be a single method name without wild-card
characters. The method <code>info methods ?pattern?</code> returns a list of
matching names, which might be empty. These different methods appear
appropriate depending on the context.</p></div>
<div class="tableblock">
<table rules="all"
width="100%"
frame="void"
cellspacing="0" cellpadding="4">
<col width="50%" />
<col width="50%" />
<thead>
<tr>
<th align="left" valign="middle">XOTcl </th>
<th align="left" valign="middle">Next Scripting Language</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'>/obj|cls/ <span class='nx-keyword'>info</span> \
[inst](commands|procs|parametercmd) \
<span class='nx-placeholder'>?pattern?</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>method</span> exists <span class='nx-placeholder'>/methodName/</span>
<span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>methods</span> <span class='nx-placeholder'>/methodName/</span>
<span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>object</span> <span class='nx-keyword'>method</span> exists <span class='nx-placeholder'>/methodName/</span>
<span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>object</span> <span class='nx-keyword'>methods</span> <span class='nx-placeholder'>/methodName/</span></pre></div></div></div></td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="sect3">
<h4 id="_list_callable_methods">2.6.5. List callable methods</h4>
<div class="paragraph"><p>In order to obtain the set of artefacts for an object defined in the
class hierarchy, NX uses <code>info lookup</code>. One can either lookup methods
(via <code>info lookup methods</code>) or slots (via <code>info lookup slots</code>). The
plural term refers to a potential set of return values.</p></div>
<div class="tableblock">
<table rules="all"
width="100%"
frame="void"
cellspacing="0" cellpadding="4">
<col width="50%" />
<col width="50%" />
<thead>
<tr>
<th align="left" valign="middle">XOTcl </th>
<th align="left" valign="middle">Next Scripting Language</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>methods</span> <span class='nx-placeholder'>?pattern?</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>lookup</span> <span class='nx-keyword'>methods</span> ... <span class='nx-placeholder'>?pattern?</span>
<span class='nx-comment'># Returns list of method names</span></pre></div></div></div></td>
</tr>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># n.a.</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># List only application specific methods
</span><span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>lookup</span> <span class='nx-keyword'>methods</span> -source application ... <span class='nx-placeholder'>?pattern?</span>
<span class='nx-comment'># Returns list of method names</span></pre></div></div></div></td>
</tr>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Options for 'info methods'
</span><span class='nx-comment'>#
</span><span class='nx-comment'># -incontext
</span><span class='nx-comment'># -nomixins</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Options for 'info lookup methods'
</span><span class='nx-comment'>#
</span><span class='nx-comment'># -source ...
</span><span class='nx-comment'># -callprotection ...
</span><span class='nx-comment'># -incontext
</span><span class='nx-comment'># -type ...
</span><span class='nx-comment'># -nomixins</span></pre></div></div></div></td>
</tr>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># n.a.</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># List slot objects defined for obj
</span><span class='nx-comment'># -source might be all|application|baseclasses
</span><span class='nx-comment'># -type is the class of the slot object
</span>
<span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>lookup</span> slots <span class='nx-placeholder'>?-type ...?</span> <span class='nx-placeholder'>?-source ...?</span> <span class='nx-placeholder'>?pattern?</span>
<span class='nx-comment'># Returns list of slot objects</span></pre></div></div></div></td>
</tr>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># List registered filters
</span><span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> filters -order <span class='nx-placeholder'>?-guards?</span> <span class='nx-placeholder'>?pattern?</span>
<span class='nx-comment'># List registered mixins
</span><span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> mixins -heritage <span class='nx-placeholder'>?-guards?</span> <span class='nx-placeholder'>?pattern?</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># List registered filters
</span><span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>lookup</span> filters <span class='nx-placeholder'>?-guards?</span> <span class='nx-placeholder'>?pattern?</span>
<span class='nx-comment'># List registered mixins
</span><span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>lookup</span> mixins <span class='nx-placeholder'>?-guards?</span> <span class='nx-placeholder'>?pattern?</span></pre></div></div></div></td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="sect3">
<h4 id="_list_object_class_where_a_specified_method_is_defined">2.6.6. List object/class where a specified method is defined</h4>
<div class="paragraph"><p><code>info lookup</code> can be used as well to determine, where exactly an
artefact is located. One can obtain this way a method handle, where
a method or filter is defined.</p></div>
<div class="paragraph"><p>The concept of a <em>method-handle</em> is new in NX. The method-handle
can be used to obtain more information about the method, such as
e.g. the definition of the method.</p></div>
<div class="tableblock">
<table rules="all"
width="100%"
frame="void"
cellspacing="0" cellpadding="4">
<col width="50%" />
<col width="50%" />
<thead>
<tr>
<th align="left" valign="middle">XOTcl </th>
<th align="left" valign="middle">Next Scripting Language</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/obj/</span> procsearch <span class='nx-placeholder'>/methodName/</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>lookup</span> <span class='nx-keyword'>method</span> <span class='nx-placeholder'>/methodName/</span>
<span class='nx-comment'># Returns method-handle</span></pre></div></div></div></td>
</tr>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/obj/</span> filtersearch <span class='nx-placeholder'>/methodName/</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>lookup</span> <span class='nx-keyword'>filter</span> <span class='nx-placeholder'>/methodName/</span>
<span class='nx-comment'># Returns method-handle</span></pre></div></div></div></td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="sect3">
<h4 id="_list_definition_of_scripted_methods">2.6.7. List definition of scripted methods</h4>
<div class="paragraph"><p>XOTcl contains a long list of <code>info</code> subcommands for different kinds of
methods and for obtaining more detailed information about these
methods.</p></div>
<div class="paragraph"><p>In NX, this list of <code>info</code> subcommands is much shorter and more
orthogonal. For example, <code>info method definition</code> can be used to obtain
with a single command the full definition of a <em>scripted method</em>, and
furthermore, it works as well the same way to obtain e.g. the
definition of a <em>forwarder</em> or an <em>alias</em>.</p></div>
<div class="paragraph"><p>While XOTcl uses different names for info options for objects and
classes (using the prefix "inst" for instance specific method), NX
uses for object specific method the modifier <code>object</code>. For definition
of class object specific methods, use the modifier <code>object</code> as usual.</p></div>
<div class="tableblock">
<table rules="all"
width="100%"
frame="void"
cellspacing="0" cellpadding="4">
<col width="50%" />
<col width="50%" />
<thead>
<tr>
<th align="left" valign="middle">XOTcl </th>
<th align="left" valign="middle">Next Scripting Language</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># n.a.</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>method</span> definition <span class='nx-placeholder'>/methodName/</span>
<span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>object</span> <span class='nx-keyword'>method</span> definition <span class='nx-placeholder'>/methodName/</span></pre></div></div></div></td>
</tr>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>info</span> instbody <span class='nx-placeholder'>/methodName/</span>
<span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> body <span class='nx-placeholder'>/methodName/</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>method</span> body <span class='nx-placeholder'>/methodName/</span>
<span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>object</span> <span class='nx-keyword'>method</span> body <span class='nx-placeholder'>/methodName/</span></pre></div></div></div></td>
</tr>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>info</span> instargs <span class='nx-placeholder'>/methodName/</span>
<span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> args <span class='nx-placeholder'>/methodName/</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>method</span> args <span class='nx-placeholder'>/methodName/</span>
<span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>object</span> <span class='nx-keyword'>method</span> args <span class='nx-placeholder'>/methodName/</span></pre></div></div></div></td>
</tr>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>info</span> instnonposargs <span class='nx-placeholder'>/methodName/</span>
<span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>object</span> <span class='nx-keyword'>method</span> args <span class='nx-placeholder'>/methodName/</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>method</span> parameter <span class='nx-placeholder'>/methodName/</span>
<span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>object</span> <span class='nx-keyword'>method</span> parameter <span class='nx-placeholder'>/methodName/</span></pre></div></div></div></td>
</tr>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>info</span> instdefault <span class='nx-placeholder'>/methodName/</span>
<span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> default <span class='nx-placeholder'>/methodName/</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># not needed, part of
</span><span class='nx-comment'># "info ?object? method parameter"</span></pre></div></div></div></td>
</tr>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>info</span> instpre <span class='nx-placeholder'>/methodName/</span>
<span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> pre <span class='nx-placeholder'>/methodName/</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>method</span> precondition <span class='nx-placeholder'>/methodName/</span>
<span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>object</span> <span class='nx-keyword'>method</span> precondition <span class='nx-placeholder'>/methodName/</span></pre></div></div></div></td>
</tr>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>info</span> instpost <span class='nx-placeholder'>/methodName/</span>
<span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> post <span class='nx-placeholder'>/methodName/</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>method</span> postcondition <span class='nx-placeholder'>/methodName/</span>
<span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>object</span> <span class='nx-keyword'>method</span> postcondition <span class='nx-placeholder'>/methodName/</span></pre></div></div></div></td>
</tr>
</tbody>
</table>
</div>
<div class="paragraph"><p>Another powerful introspection option in NX is <code>info ?object? method
syntax</code> which obtains a representation of the parameters of a
method in the style of Tcl man pages (regardless of the kind of
method).</p></div>
<div class="tableblock">
<table rules="all"
width="100%"
frame="void"
cellspacing="0" cellpadding="4">
<col width="50%" />
<col width="50%" />
<thead>
<tr>
<th align="left" valign="middle">XOTcl </th>
<th align="left" valign="middle">Next Scripting Language</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># n.a.</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>method</span> syntax <span class='nx-placeholder'>/methodName/</span>
<span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>object</span> <span class='nx-keyword'>method</span> syntax <span class='nx-placeholder'>/methodName/</span></pre></div></div></div></td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="sect3">
<h4 id="info_configure_parameter">2.6.8. List Configure Parameters</h4>
<div class="paragraph"><p>The way, how newly created objects can be configured is determined in NX
via properties. The configuration happens during creation via the
methods <code>create</code> or <code>new</code> or during run time via <code>configure</code>. These
methods have therefore virtual argument lists, depending on the object
or class on which they are applied.</p></div>
<div class="tableblock">
<table rules="all"
width="100%"
frame="void"
cellspacing="0" cellpadding="4">
<col width="50%" />
<col width="50%" />
<thead>
<tr>
<th align="left" valign="middle">XOTcl </th>
<th align="left" valign="middle">Next Scripting Language</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># n.a.</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Return the parameters applicable to
</span><span class='nx-comment'># the create method of a certain class.
</span><span class='nx-comment'># class can be configured. A pattern can
</span><span class='nx-comment'># be used to filter the results.
</span>
<span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>lookup</span> parameters <span class='nx-keyword'>create</span> ?<span class='nx-placeholder'>/pattern/</span>?
<span class='nx-comment'># Return in the result in documentation syntax
</span>
<span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>lookup</span> syntax <span class='nx-keyword'>create</span> ?<span class='nx-placeholder'>/pattern/</span>?
<span class='nx-comment'># "info lookup parameters configure" returns
</span><span class='nx-comment'># parameters available for configuring the
</span><span class='nx-comment'># current object (might contain object
</span><span class='nx-comment'># specific information)
</span>
<span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>lookup</span> parameters <span class='nx-keyword'>configure</span> <span class='nx-placeholder'>?pattern?</span>
<span class='nx-comment'># "info lookup configure syntax" returns syntax of
</span><span class='nx-comment'># a call to configure in the Tcl parameter syntax
</span>
<span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>lookup</span> syntax <span class='nx-keyword'>configure</span>
<span class='nx-comment'># Obtain information from a parameter
</span><span class='nx-comment'># (as e.g. returned from "info lookup
</span><span class='nx-comment'># parameters configure").
</span>
nsf::parameter::info name <span class='nx-placeholder'>/parameter/</span>
nsf::parameter::info syntax <span class='nx-placeholder'>/parameter/</span>
nsf::parameter::info type <span class='nx-placeholder'>/parameter/</span></pre></div></div></div></td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="sect3">
<h4 id="_list_variable_declarations_property_and_variable">2.6.9. List Variable Declarations (property and variable)</h4>
<div class="tableblock">
<table rules="all"
width="100%"
frame="void"
cellspacing="0" cellpadding="4">
<col width="50%" />
<col width="50%" />
<thead>
<tr>
<th align="left" valign="middle">XOTcl </th>
<th align="left" valign="middle">Next Scripting Language</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># obtain parameter definitions defined
</span><span class='nx-comment'># for a class
</span><span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>info</span> parameter</pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># "info variables" returns handles of
</span><span class='nx-comment'># properties and variables defined by this
</span><span class='nx-comment'># class or object
</span>
<span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>info</span> variables <span class='nx-placeholder'>?pattern?</span>
<span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>object</span> variables <span class='nx-placeholder'>?pattern?</span>
<span class='nx-comment'># "info lookup variables" returns handles
</span><span class='nx-comment'># of variables and properties applicable
</span><span class='nx-comment'># for the current object (might contain
</span><span class='nx-comment'># object specific information)
</span>
<span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>lookup</span> variables <span class='nx-placeholder'>/pattern/</span>
<span class='nx-comment'># "info variable" lists details about a
</span><span class='nx-comment'># single property or variable.
</span>
<span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>variable</span> definition <span class='nx-placeholder'>/handle/</span>
<span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>variable</span> name <span class='nx-placeholder'>/handle/</span>
<span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>variable</span> parameter <span class='nx-placeholder'>/handle/</span></pre></div></div></div></td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="sect3">
<h4 id="_list_slots">2.6.10. List Slots</h4>
<div class="tableblock">
<table rules="all"
width="100%"
frame="void"
cellspacing="0" cellpadding="4">
<col width="50%" />
<col width="50%" />
<thead>
<tr>
<th align="left" valign="middle">XOTcl </th>
<th align="left" valign="middle">Next Scripting Language</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># n.a.</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Return list of slots objects defined on the
</span><span class='nx-comment'># object or class
</span><span class='nx-comment'>#
</span><span class='nx-comment'># -source might be all|application|baseclasses
</span><span class='nx-comment'># -type is the class of the slot object
</span><span class='nx-comment'># -closure includes slots of superclasses
</span>
<span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>info</span> slots \
<span class='nx-placeholder'>?-type value?</span> <span class='nx-placeholder'>?-closure?</span> <span class='nx-placeholder'>?-source value?</span> <span class='nx-placeholder'>?pattern?</span>
<span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>object</span> slots <span class='nx-placeholder'>?-type ...?</span> <span class='nx-placeholder'>?pattern?</span>
<span class='nx-comment'># List reachable slot objects defined for obj
</span><span class='nx-comment'># -source might be all|application|baseclasses
</span><span class='nx-comment'># -type is the class of the slot object
</span><span class='nx-comment'># Returns list of slot objects.
</span>
<span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>lookup</span> slots \
<span class='nx-placeholder'>?-type ...?</span> <span class='nx-placeholder'>?-source ... ?</span>pattern?
<span class='nx-comment'># Obtain definition, name or parameter from
</span><span class='nx-comment'># slot object
</span>
<span class='nx-placeholder'>/slotobj/</span> definition
<span class='nx-placeholder'>/slotobj/</span> name
<span class='nx-placeholder'>/slotobj/</span> parameter</pre></div></div></div></td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="sect3">
<h4 id="_list_filter_or_mixins">2.6.11. List Filter or Mixins</h4>
<div class="paragraph"><p>In NX all introspection options for filters are provided via
<code>info filters</code> and all introspection options for mixins are
provided via <code>info mixins</code>.</p></div>
<div class="tableblock">
<table rules="all"
width="100%"
frame="void"
cellspacing="0" cellpadding="4">
<col width="50%" />
<col width="50%" />
<thead>
<tr>
<th align="left" valign="middle">XOTcl </th>
<th align="left" valign="middle">Next Scripting Language</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>filter</span> <span class='nx-placeholder'>?-guards?</span> <span class='nx-placeholder'>?-order?</span> <span class='nx-placeholder'>?pattern?</span>
<span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> filterguard <span class='nx-placeholder'>/name/</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>object</span> filters \
<span class='nx-placeholder'>?-guards?</span> <span class='nx-placeholder'>?pattern?</span></pre></div></div></div></td>
</tr>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>info</span> instfilter \
<span class='nx-placeholder'>?-guards?</span> <span class='nx-placeholder'>?-order?</span> <span class='nx-placeholder'>?pattern?</span>
<span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>info</span> instfilterguard <span class='nx-placeholder'>/name/</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>info</span> filters \
<span class='nx-placeholder'>?-guards?</span> <span class='nx-placeholder'>?pattern?</span></pre></div></div></div></td>
</tr>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>mixin</span> <span class='nx-placeholder'>?-guards?</span> <span class='nx-placeholder'>?-order ?</span>pattern?
<span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> mixinguard <span class='nx-placeholder'>/name/</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>object</span> mixins \
<span class='nx-placeholder'>?-guards?</span> <span class='nx-placeholder'>?pattern?</span></pre></div></div></div></td>
</tr>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>info</span> instmixin \
<span class='nx-placeholder'>?-guards?</span> <span class='nx-placeholder'>?-order?</span> <span class='nx-placeholder'>?pattern?</span>
<span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>info</span> instmixinguard <span class='nx-placeholder'>/name/</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>info</span> mixins \
<span class='nx-placeholder'>?-closure?</span> <span class='nx-placeholder'>?-guards?</span> <span class='nx-placeholder'>?-heritage?</span> <span class='nx-placeholder'>?pattern?</span></pre></div></div></div></td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="sect3">
<h4 id="_list_definition_of_methods_defined_by_aliases_setters_or_forwarders">2.6.12. List definition of methods defined by aliases, setters or forwarders</h4>
<div class="paragraph"><p>As mentioned earlier, <code>info method definition</code> can be used on every
kind of method. The same call can be used to obtain the definition of
a scripted method, a method-alias, a forwarder or a setter method.</p></div>
<div class="tableblock">
<table rules="all"
width="100%"
frame="void"
cellspacing="0" cellpadding="4">
<col width="50%" />
<col width="50%" />
<thead>
<tr>
<th align="left" valign="middle">XOTcl </th>
<th align="left" valign="middle">Next Scripting Language</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># n.a.</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>method</span> definition <span class='nx-placeholder'>/methodName/</span>
<span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>object</span> <span class='nx-keyword'>method</span> definition <span class='nx-placeholder'>/methodName/</span></pre></div></div></div></td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="sect3">
<h4 id="_list_method_handles">2.6.13. List Method-Handles</h4>
<div class="paragraph"><p>NX supports <em>method-handles</em> to provide means to obtain further
information about a method or to change maybe some properties of a
method. When a method is created, the method creating method returns
the method handle to the created method.</p></div>
<div class="tableblock">
<table rules="all"
width="100%"
frame="void"
cellspacing="0" cellpadding="4">
<col width="50%" />
<col width="50%" />
<thead>
<tr>
<th align="left" valign="middle">XOTcl </th>
<th align="left" valign="middle">Next Scripting Language</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># n.a.</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'>#
</span><span class='nx-comment'># List the method handle of the specified method,
</span><span class='nx-comment'># can be used e.g. for aliases. "handle" is the short
</span><span class='nx-comment'># form of "definitionhandle".
</span><span class='nx-comment'>#
</span><span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>method</span> handle <span class='nx-placeholder'>/methodName/</span>
<span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>object</span> <span class='nx-keyword'>method</span> handle <span class='nx-placeholder'>/methodName/</span>
<span class='nx-comment'>#
</span><span class='nx-comment'># For ensemble methods (method name contains
</span><span class='nx-comment'># spaces) one can query as well the registration
</span><span class='nx-comment'># handle, which is the handle to the root of the
</span><span class='nx-comment'># ensemble; the definition handle points to the
</span><span class='nx-comment'># leaf of the ensemble.
</span><span class='nx-comment'>#
</span><span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>method</span> registrationhandle <span class='nx-placeholder'>/methodName/</span>
<span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>object</span> <span class='nx-keyword'>method</span> registrationhandle <span class='nx-placeholder'>/methodName/</span>
<span class='nx-comment'>#
</span><span class='nx-comment'># For aliases, one can query the original
</span><span class='nx-comment'># definition via "info method origin"
</span><span class='nx-comment'>#
</span><span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>method</span> origin <span class='nx-placeholder'>/methodName/</span>
<span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>object</span> <span class='nx-keyword'>method</span> origin <span class='nx-placeholder'>/methodName/</span></pre></div></div></div></td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="sect3">
<h4 id="_list_type_of_a_method">2.6.14. List type of a method</h4>
<div class="paragraph"><p>The method <code>info ?object? method type</code> is new in NX to obtain the type of the
specified method.</p></div>
<div class="tableblock">
<table rules="all"
width="100%"
frame="void"
cellspacing="0" cellpadding="4">
<col width="50%" />
<col width="50%" />
<thead>
<tr>
<th align="left" valign="middle">XOTcl </th>
<th align="left" valign="middle">Next Scripting Language</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># n.a.</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>method</span> type <span class='nx-placeholder'>/methodName/</span>
<span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> <span class='nx-keyword'>object</span> <span class='nx-keyword'>method</span> type <span class='nx-placeholder'>/methodName/</span></pre></div></div></div></td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="sect3">
<h4 id="_list_the_scope_of_mixin_classes">2.6.15. List the scope of mixin classes</h4>
<div class="paragraph"><p>NX provides a richer set of introspection options to obtain
information, where mixins classes are mixed into.</p></div>
<div class="tableblock">
<table rules="all"
width="100%"
frame="void"
cellspacing="0" cellpadding="4">
<col width="50%" />
<col width="50%" />
<thead>
<tr>
<th align="left" valign="middle">XOTcl </th>
<th align="left" valign="middle">Next Scripting Language</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>info</span> mixinof <span class='nx-placeholder'>?-closure?</span> <span class='nx-placeholder'>?pattern?</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># List objects, where /cls/ is a
</span><span class='nx-comment'># per-object mixin
</span>
<span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>info</span> mixinof -scope <span class='nx-keyword'>object</span> <span class='nx-placeholder'>?-closure?</span> \
<span class='nx-placeholder'>?pattern?</span></pre></div></div></div></td>
</tr>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>info</span> instmixinof <span class='nx-placeholder'>?-closure?</span> <span class='nx-placeholder'>?pattern?</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># List classes, where /cls/ is a per-class mixin
</span>
<span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>info</span> mixinof -scope <span class='nx-keyword'>class</span> <span class='nx-placeholder'>?-closure?</span> \
<span class='nx-placeholder'>?pattern?</span></pre></div></div></div></td>
</tr>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># n.a.</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># List objects and classes, where /cls/ is
</span><span class='nx-comment'># either a per-object or a per-class mixin
</span>
<span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>info</span> mixinof -scope all <span class='nx-placeholder'>?-closure?</span> \
<span class='nx-placeholder'>?pattern?</span></pre></div></div>
<div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>info</span> mixinof <span class='nx-placeholder'>?-closure?</span> <span class='nx-placeholder'>?pattern?</span></pre></div></div></div></td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="sect3">
<h4 id="_check_properties_of_object_and_classes">2.6.16. Check properties of object and classes</h4>
<div class="paragraph"><p>Similar as noted before, NX uses rather a hierarchical approach of
naming using multiple layers of subcommands).</p></div>
<div class="tableblock">
<table rules="all"
width="100%"
frame="void"
cellspacing="0" cellpadding="4">
<col width="50%" />
<col width="50%" />
<thead>
<tr>
<th align="left" valign="middle">XOTcl </th>
<th align="left" valign="middle">Next Scripting Language</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/obj/</span> istype <span class='nx-placeholder'>/sometype/</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Check if object is a subtype of some class
</span><span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> has type <span class='nx-placeholder'>/sometype/</span></pre></div></div></div></td>
</tr>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/obj/</span> ismixin <span class='nx-placeholder'>/cls/</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Check if object has the specified mixin registered
</span><span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> has <span class='nx-keyword'>mixin</span> <span class='nx-placeholder'>/cls/</span></pre></div></div></div></td>
</tr>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/obj/</span> isclass ?<span class='nx-placeholder'>/cls/</span>?</pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Check if object is an NX class
</span><span class='nx-placeholder'>/obj/</span> has type ::nx::Class
<span class='nx-comment'># Check if object is a class in one of the
</span><span class='nx-comment'># NSF object systems
</span>::nsf::is <span class='nx-keyword'>class</span> <span class='nx-placeholder'>/obj/</span></pre></div></div></div></td>
</tr>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/obj/</span> ismetaclass <span class='nx-placeholder'>/cls/</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Check if class is an NX metaclass
</span><span class='nx-keyword'>expr</span> {[<span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>info</span> heritage ::nx::Class] ne <span class='nx-string'>""</span>}
<span class='nx-comment'># Check if object is a metaclass in one of the
</span><span class='nx-comment'># NSF object systems
</span>::nsf::is <span class='nx-keyword'>metaclass</span> <span class='nx-placeholder'>/obj/</span></pre></div></div></div></td>
</tr>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># n.a.</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Check if object is a baseclass of an object system
</span>::nsf::is baseclass <span class='nx-placeholder'>/obj/</span></pre></div></div></div></td>
</tr>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># n.a.</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Return name of object (without namespace prefix)
</span><span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> name</pre></div></div></div></td>
</tr>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>object</span>::exists <span class='nx-placeholder'>/obj/</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># Check for existence of object (nsf primitive)
</span>::nsf::object::exists <span class='nx-placeholder'>/obj/</span></pre></div></div></div></td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="sect3">
<h4 id="_call_stack_introspection">2.6.17. Call-stack Introspection</h4>
<div class="paragraph"><p>Call-stack introspection is very similar in NX and XOTcl. NX uses for
subcommand the term <code>current</code> instead of <code>self</code>, since <code>self</code> has a
strong connotation to the current object. The term <code>proc</code> is renamed
by <code>method</code>.</p></div>
<div class="tableblock">
<table rules="all"
width="100%"
frame="void"
cellspacing="0" cellpadding="4">
<col width="50%" />
<col width="50%" />
<thead>
<tr>
<th align="left" valign="middle">XOTcl </th>
<th align="left" valign="middle">Next Scripting Language</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-keyword'>self</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-keyword'>self</span></pre></div></div>
<div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-keyword'>current</span> <span class='nx-keyword'>object</span></pre></div></div></div></td>
</tr>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-keyword'>self</span> <span class='nx-keyword'>class</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-keyword'>current</span> <span class='nx-keyword'>class</span></pre></div></div></div></td>
</tr>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-keyword'>self</span> args</pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-keyword'>current</span> args</pre></div></div></div></td>
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<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-keyword'>self</span> <span class='nx-keyword'>proc</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-keyword'>current</span> <span class='nx-keyword'>method</span></pre></div></div></div></td>
</tr>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-keyword'>self</span> callingclass</pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-keyword'>current</span> calledclass</pre></div></div></div></td>
</tr>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-keyword'>self</span> callingobject</pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-keyword'>current</span> callingobject</pre></div></div></div></td>
</tr>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-keyword'>self</span> callingproc</pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-keyword'>current</span> callingmethod</pre></div></div></div></td>
</tr>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-keyword'>self</span> calledclass</pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
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.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
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<pre class='nx'><span class='nx-keyword'>current</span> calledclass</pre></div></div></div></td>
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<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
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<pre class='nx'><span class='nx-keyword'>self</span> calledproc</pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
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.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
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<pre class='nx'><span class='nx-keyword'>current</span> calledmethod</pre></div></div></div></td>
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<td align="left" valign="middle"><div><div class="listingblock">
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.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
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.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
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<pre class='nx'><span class='nx-keyword'>self</span> isnextcall</pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
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<pre class='nx'><span class='nx-keyword'>current</span> isnextcall</pre></div></div></div></td>
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<td align="left" valign="middle"><div><div class="listingblock">
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<pre class='nx'><span class='nx-keyword'>self</span> <span class='nx-keyword'>next</span></pre></div></div></div></td>
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<div class="content"><style type='text/css'>
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<pre class='nx'><span class='nx-comment'># Returns method-handle of the
</span><span class='nx-comment'># method to be called via "next"
</span><span class='nx-keyword'>current</span> <span class='nx-keyword'>next</span></pre></div></div></div></td>
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<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
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<pre class='nx'><span class='nx-keyword'>self</span> filterreg</pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
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<pre class='nx'><span class='nx-comment'># Returns method-handle of the
</span><span class='nx-comment'># filter method
</span><span class='nx-keyword'>current</span> filterreg</pre></div></div></div></td>
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.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-keyword'>self</span> callinglevel</pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-keyword'>current</span> callinglevel</pre></div></div></div></td>
</tr>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-keyword'>self</span> activelevel</pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-keyword'>current</span> activelevel</pre></div></div></div></td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_other_predefined_methods">2.7. Other Predefined Methods</h3>
<div class="tableblock">
<table rules="all"
width="100%"
frame="void"
cellspacing="0" cellpadding="4">
<col width="50%" />
<col width="50%" />
<thead>
<tr>
<th align="left" valign="middle">XOTcl </th>
<th align="left" valign="middle">Next Scripting Language</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/obj/</span> requireNamespace</pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>require</span> <span class='nx-keyword'>namespace</span></pre></div></div></div></td>
</tr>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># n.a.</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>require</span> <span class='nx-keyword'>method</span></pre></div></div></div></td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="sect2">
<h3 id="_dispatch_aliases_etc">2.8. Dispatch, Aliases, etc.</h3>
<div class="paragraph"><p>todo: to be done or omitted</p></div>
</div>
<div class="sect2">
<h3 id="_assertions">2.9. Assertions</h3>
<div class="paragraph"><p>In contrary to XOTcl, NX provides no pre-registered methods for
assertion handling. All assertion handling can e performed via the
Next Scripting primitive <code>nsf::method::assertion</code>.</p></div>
<div class="tableblock">
<table rules="all"
width="100%"
frame="void"
cellspacing="0" cellpadding="4">
<col width="50%" />
<col width="50%" />
<thead>
<tr>
<th align="left" valign="middle">XOTcl </th>
<th align="left" valign="middle">Next Scripting Language</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/obj/</span> check <span class='nx-placeholder'>/checkoptions/</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'>::nsf::method::assertion <span class='nx-placeholder'>/obj/</span> check <span class='nx-placeholder'>/checkoptions/</span></pre></div></div></div></td>
</tr>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> check</pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'>::nsf::method::assertion <span class='nx-placeholder'>/obj/</span> check</pre></div></div></div></td>
</tr>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/obj/</span> invar <span class='nx-placeholder'>/conditions/</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'>::nsf::method::assertion <span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>object</span>-invar <span class='nx-placeholder'>/conditions/</span></pre></div></div></div></td>
</tr>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>info</span> invar</pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'>::nsf::method::assertion <span class='nx-placeholder'>/obj/</span> <span class='nx-keyword'>object</span>-invar</pre></div></div></div></td>
</tr>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/cls/</span> instinvar <span class='nx-placeholder'>/conditions/</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'>::nsf::method::assertion <span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>class</span>-invar <span class='nx-placeholder'>/conditions/</span></pre></div></div></div></td>
</tr>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>info</span> instinvar</pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'>::nsf::method::assertion <span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>class</span>-invar</pre></div></div></div></td>
</tr>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/cls/</span> invar <span class='nx-placeholder'>/conditions/</span></pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'>::nsf::method::assertion <span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>object</span>-invar <span class='nx-placeholder'>/conditions/</span></pre></div></div></div></td>
</tr>
<tr>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>info</span> invar</pre></div></div></div></td>
<td align="left" valign="middle"><div><div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'>::nsf::method::assertion <span class='nx-placeholder'>/cls/</span> <span class='nx-keyword'>object</span>-invar</pre></div></div></div></td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="sect2">
<h3 id="_method_protection">2.10. Method Protection</h3>
<div class="paragraph"><p>As described <a href="#method-protect-example">above</a>, NX supports method
protection via the method modifiers <code>protected</code> and <code>public</code>. A
protected method can be only called from an object of that class,
while public methods can be called from every object. The method
protection can be used to every kind of method, such as e.g. scripted
methods, aliases, forwarders, or accessors. For invocations,
the most specific definition (might be a mixin) is used for
determining the protection.</p></div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_incompatibilities_between_xotcl_1_and_xotcl_2">3. Incompatibilities between XOTcl 1 and XOTcl 2</h2>
<div class="sectionbody">
<div class="sect2">
<h3 id="_resolvers_2">3.1. Resolvers</h3>
<div class="paragraph"><p>The resolvers (variable resolvers, function resolvers) of the Next
Scripting Framework are used as well within XOTcl 2. When variable
names or method names starting with a single colon are used in XOTcl 1
scripts, conflicts will arise with the resolver. These names must be
replaced.</p></div>
</div>
<div class="sect2">
<h3 id="_parameters_2">3.2. Parameters</h3>
<div class="paragraph"><p>The following changes for parameters could be regarded as bug-fixes.</p></div>
<div class="sect3">
<h4 id="_parameter_usage_without_a_value">3.2.1. Parameter usage without a value</h4>
<div class="paragraph"><p>In XOTcl 1, it was possible to call a parameter method during object
creation via the dash-interface without a value (in the example below <code>-x</code>).</p></div>
<div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># XOTcl example
</span>
<span class='nx-keyword'>Class</span> Foo -parameter {x y}
Foo f1 -x -y 1</pre></div></div>
<div class="paragraph"><p>Such cases are most likely mistakes. All parameter configurations in XOTcl 2 require an argument.</p></div>
</div>
<div class="sect3">
<h4 id="_ignored_parameter_definitions">3.2.2. Ignored Parameter definitions</h4>
<div class="paragraph"><p>In XOTcl 1, a more specific parameter definition without a default was ignored
when a more general parameter definition with a default was
present. In the example below, the object <code>b1</code> contained in XOTcl 1
incorrectly the parameter <code>x</code> (set via default from <code>Foo</code>), while in
XOTcl 2, the variable won’t be set.</p></div>
<div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># XOTcl example
</span>
<span class='nx-keyword'>Class</span> Foo -parameter {{x 1}}
<span class='nx-keyword'>Class</span> Bar -superclass Foo -parameter x
Bar b1</pre></div></div>
</div>
<div class="sect3">
<h4 id="_changing_classes_and_superclasses">3.2.3. Changing classes and superclasses</h4>
<div class="paragraph"><p>NX does not define the methods <code>class</code> and <code>superclass</code> (like XOTcl), but allows one to
alter all object/class relations (including
class/superclass/object-mixin/…)
<code>nsf::relation::set</code>. The class and superclass can be certainly queried
in all variants with <code>info class</code> or <code>info superclasses</code>.</p></div>
<div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># NX example
</span>
<span class='nx-keyword'>nx::Class</span> <span class='nx-keyword'>create</span> Foo
Foo <span class='nx-keyword'>create</span> f1
<span class='nx-comment'># now alter the class of object f1
</span>nsf::relation::set f1 <span class='nx-keyword'>class</span> ::nx::Object</pre></div></div>
</div>
<div class="sect3">
<h4 id="_overwriting_procs_methods_with_objects_and_vice_versa">3.2.4. Overwriting procs/methods with objects and vice versa</h4>
<div class="paragraph"><p>NSF is now more conservative on object/method creation. In contrary to
XOTcl 1 NSF does not allow one to redefined a pre-existing command
(e.g. "set") with an object and vice versa. Like in XOTcl 1,
preexisting objects and classes con be redefined (necessary for
reloading objects/classes in a running interpreter).</p></div>
</div>
<div class="sect3">
<h4 id="_info_heritage">3.2.5. Info heritage</h4>
<div class="paragraph"><p><code>info heritage</code> returns in XOTcl 1 the transitive superclass
hierarchy, which is equivalent with <code>info superclasses -closure</code> and
therefore not necessary. In XOTcl 2 (and NX), <code>info heritage</code> includes
as well the transitive per-class mixins.</p></div>
</div>
</div>
<div class="sect2">
<h3 id="_slots">3.3. Slots</h3>
<div class="paragraph"><p>All slot objects (also XOTcl slot objects) are now next-scripting
objects of baseclass <code>::nx::Slot</code>. The name of the experimental
default-setter <code>initcmd</code> was changed to <code>defaultcmd</code>. Code directly
working on the slots objects has to be adapted.</p></div>
</div>
<div class="sect2">
<h3 id="_obsolete_commands">3.4. Obsolete Commands</h3>
<div class="paragraph"><p>Parameter-classes were rarely used and have been replaced by the more
general object parameterization. Therefore, <code>cl info parameterclass</code> has
been removed.</p></div>
</div>
<div class="sect2">
<h3 id="_stronger_checking">3.5. Stronger Checking</h3>
<div class="paragraph"><p>The Next Scripting Framework performs stronger checking than XOTcl 1
For example, the requiredness of slots in XOTcl 1 was just a
comment, while XOTcl 2 enforces it.</p></div>
</div>
<div class="sect2">
<h3 id="_exit_handlers">3.6. Exit Handlers</h3>
<div class="paragraph"><p>The exit handler interface changed from a method of <code>::xotcl::Object</code>
into the Tcl command <code>::nsf::exithandler</code>:</p></div>
<div class="listingblock">
<div class="content"><style type='text/css'>
.nx {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-comment'># NX example
</span>::nsf::exithandler <span class='nx-keyword'>set</span>|get|<span class='nx-keyword'>unset</span> <span class='nx-placeholder'>?arg?</span></pre></div></div>
</div>
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Version 2.4.0<br />
Last updated
2022-08-09 15:03:30 CEST
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