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|
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
<head>
<title>Penlight Documentation</title>
<link rel="stylesheet" href="../ldoc_fixed.css" type="text/css" />
</head>
<body>
<div id="container">
<div id="product">
<div id="product_logo"></div>
<div id="product_name"><big><b></b></big></div>
<div id="product_description"></div>
</div> <!-- id="product" -->
<div id="main">
<!-- Menu -->
<div id="navigation">
<br/>
<h1>Penlight</h1>
<ul>
<li><a href="https://github.com/lunarmodules/Penlight">GitHub Project</a></li>
<li><a href="../index.html">Documentation</a></li>
</ul>
<h2>Contents</h2>
<ul>
<li><a href="#Functions">Functions</a></li>
</ul>
<h2>Libraries</h2>
<ul class="nowrap">
<li><a href="../libraries/pl.html">pl</a></li>
<li><a href="../libraries/pl.app.html">pl.app</a></li>
<li><a href="../libraries/pl.array2d.html">pl.array2d</a></li>
<li><a href="../libraries/pl.class.html">pl.class</a></li>
<li><a href="../libraries/pl.compat.html">pl.compat</a></li>
<li><a href="../libraries/pl.comprehension.html">pl.comprehension</a></li>
<li><a href="../libraries/pl.config.html">pl.config</a></li>
<li><a href="../libraries/pl.data.html">pl.data</a></li>
<li><a href="../libraries/pl.dir.html">pl.dir</a></li>
<li><a href="../libraries/pl.file.html">pl.file</a></li>
<li><a href="../libraries/pl.func.html">pl.func</a></li>
<li><a href="../libraries/pl.import_into.html">pl.import_into</a></li>
<li><a href="../libraries/pl.input.html">pl.input</a></li>
<li><a href="../libraries/pl.lapp.html">pl.lapp</a></li>
<li><a href="../libraries/pl.lexer.html">pl.lexer</a></li>
<li><a href="../libraries/pl.luabalanced.html">pl.luabalanced</a></li>
<li><a href="../libraries/pl.operator.html">pl.operator</a></li>
<li><a href="../libraries/pl.path.html">pl.path</a></li>
<li><a href="../libraries/pl.permute.html">pl.permute</a></li>
<li><a href="../libraries/pl.pretty.html">pl.pretty</a></li>
<li><a href="../libraries/pl.seq.html">pl.seq</a></li>
<li><a href="../libraries/pl.sip.html">pl.sip</a></li>
<li><a href="../libraries/pl.strict.html">pl.strict</a></li>
<li><a href="../libraries/pl.stringio.html">pl.stringio</a></li>
<li><a href="../libraries/pl.stringx.html">pl.stringx</a></li>
<li><a href="../libraries/pl.tablex.html">pl.tablex</a></li>
<li><a href="../libraries/pl.template.html">pl.template</a></li>
<li><a href="../libraries/pl.test.html">pl.test</a></li>
<li><a href="../libraries/pl.text.html">pl.text</a></li>
<li><a href="../libraries/pl.types.html">pl.types</a></li>
<li><a href="../libraries/pl.url.html">pl.url</a></li>
<li><a href="../libraries/pl.utils.html">pl.utils</a></li>
<li><strong>pl.xml</strong></li>
</ul>
<h2>Classes</h2>
<ul class="nowrap">
<li><a href="../classes/pl.Date.html">pl.Date</a></li>
<li><a href="../classes/pl.List.html">pl.List</a></li>
<li><a href="../classes/pl.Map.html">pl.Map</a></li>
<li><a href="../classes/pl.MultiMap.html">pl.MultiMap</a></li>
<li><a href="../classes/pl.OrderedMap.html">pl.OrderedMap</a></li>
<li><a href="../classes/pl.Set.html">pl.Set</a></li>
</ul>
<h2>Manual</h2>
<ul class="nowrap">
<li><a href="../manual/01-introduction.md.html">Introduction</a></li>
<li><a href="../manual/02-arrays.md.html">Tables and Arrays</a></li>
<li><a href="../manual/03-strings.md.html">Strings. Higher-level operations on strings.</a></li>
<li><a href="../manual/04-paths.md.html">Paths and Directories</a></li>
<li><a href="../manual/05-dates.md.html">Date and Time</a></li>
<li><a href="../manual/06-data.md.html">Data</a></li>
<li><a href="../manual/07-functional.md.html">Functional Programming</a></li>
<li><a href="../manual/08-additional.md.html">Additional Libraries</a></li>
<li><a href="../manual/09-discussion.md.html">Technical Choices</a></li>
</ul>
<h2>Examples</h2>
<ul class="nowrap">
<li><a href="../examples/seesubst.lua.html">seesubst.lua</a></li>
<li><a href="../examples/sipscan.lua.html">sipscan.lua</a></li>
<li><a href="../examples/symbols.lua.html">symbols.lua</a></li>
<li><a href="../examples/test-cmp.lua.html">test-cmp.lua</a></li>
<li><a href="../examples/test-data.lua.html">test-data.lua</a></li>
<li><a href="../examples/test-listcallbacks.lua.html">test-listcallbacks.lua</a></li>
<li><a href="../examples/test-pretty.lua.html">test-pretty.lua</a></li>
<li><a href="../examples/test-symbols.lua.html">test-symbols.lua</a></li>
<li><a href="../examples/testclone.lua.html">testclone.lua</a></li>
<li><a href="../examples/testconfig.lua.html">testconfig.lua</a></li>
<li><a href="../examples/testglobal.lua.html">testglobal.lua</a></li>
<li><a href="../examples/testinputfields.lua.html">testinputfields.lua</a></li>
<li><a href="../examples/testinputfields2.lua.html">testinputfields2.lua</a></li>
<li><a href="../examples/testxml.lua.html">testxml.lua</a></li>
<li><a href="../examples/which.lua.html">which.lua</a></li>
</ul>
</div>
<div id="content">
<h1>Module <code>pl.xml</code></h1>
<p>XML LOM Utilities.</p>
<p> This implements some useful things on <a href="http://matthewwild.co.uk/projects/luaexpat/lom.html">LOM</a> documents, such as returned by <code>lxp.lom.parse</code>.
In particular, it can convert LOM back into XML text, with optional pretty-printing control.
It is based on stanza.lua from <a href="http://hg.prosody.im/trunk/file/4621c92d2368/util/stanza.lua">Prosody</a></p>
<pre>
> d = xml.<span class="function-name">parse</span> <span class="string">"<nodes><node id='1'>alice</node></nodes>"</span>
> = d
<nodes><node id=<span class="string">'1'</span>>alice</node></nodes>
> = xml.<span class="global">tostring</span>(d,<span class="string">''</span>,<span class="string">' '</span>)
<nodes>
<node id=<span class="string">'1'</span>>alice</node>
</nodes>
</pre>
<p> Can be used as a lightweight one-stop-shop for simple XML processing; a simple XML parser is included
but the default is to use <code>lxp.lom</code> if it can be found.
<pre>
Prosody IM
Copyright (C) 2008-2010 Matthew Wild
Copyright (C) 2008-2010 Waqas Hussain--
classic Lua XML parser by Roberto Ierusalimschy.
modified to output LOM format.
http://lua-users.org/wiki/LuaXml
</pre>
See <a href="../manual/06-data.md.html#XML">the Guide</a></p>
<p> Dependencies: <a href="../libraries/pl.utils.html#">pl.utils</a></p>
<p> Soft Dependencies: <code>lxp.lom</code> (fallback is to use basic Lua parser)</p>
<h2><a href="#Functions">Functions</a></h2>
<table class="function_list">
<tr>
<td class="name" nowrap><a href="#new">new (tag[, attr={}])</a></td>
<td class="summary">create a new document node.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#parse">parse (text_or_filename, is_file, use_basic)</a></td>
<td class="summary">parse an XML document.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#elem">elem (tag, items)</a></td>
<td class="summary">Create a Node with a set of children (text or Nodes) and attributes.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#tags">tags (list)</a></td>
<td class="summary">given a list of names, return a number of element constructors.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Doc:addtag">Doc:addtag (tag[, attrs={}])</a></td>
<td class="summary">Adds a document Node, at current position.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Doc:text">Doc:text (text)</a></td>
<td class="summary">Adds a text node, at current position.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Doc:up">Doc:up ()</a></td>
<td class="summary">Moves current position up one level.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Doc:reset">Doc:reset ()</a></td>
<td class="summary">Resets current position to top level.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Doc:add_direct_child">Doc:add_direct_child (child)</a></td>
<td class="summary">Append a child to the current Node (ignoring current position).</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Doc:add_child">Doc:add_child (child)</a></td>
<td class="summary">Append a child at the current position (without changing position).</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Doc:set_attribs">Doc:set_attribs (t)</a></td>
<td class="summary">Set attributes of a document node.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Doc:set_attrib">Doc:set_attrib (a, v)</a></td>
<td class="summary">Set a single attribute of a document node.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Doc:get_attribs">Doc:get_attribs ()</a></td>
<td class="summary">Gets the attributes of a document node.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Doc.subst">Doc.subst (template, data)</a></td>
<td class="summary">create a substituted copy of a document,</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Doc:child_with_name">Doc:child_with_name (tag)</a></td>
<td class="summary">Return the first child with a given tag name (non-recursive).</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Doc:get_elements_with_name">Doc:get_elements_with_name (tag[, dont_recurse=false])</a></td>
<td class="summary">Returns all elements in a document that have a given tag.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Doc:children">Doc:children ()</a></td>
<td class="summary">Iterator over all children of a document node, including text nodes.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Doc:first_childtag">Doc:first_childtag ()</a></td>
<td class="summary">Return the first child element of a node, if it exists.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Doc:matching_tags">Doc:matching_tags ([tag=nil[, xmlns=nil]])</a></td>
<td class="summary">Iterator that matches tag names, and a namespace (non-recursive).</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Doc:childtags">Doc:childtags ()</a></td>
<td class="summary">Iterator over all child tags of a document node.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Doc:maptags">Doc:maptags (callback)</a></td>
<td class="summary">Visit child Nodes of a node and call a function, possibly modifying the document.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#xml_escape">xml_escape (str)</a></td>
<td class="summary">Escapes a string for safe use in xml.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#xml_unescape">xml_unescape (str)</a></td>
<td class="summary">Unescapes a string from xml.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#tostring">tostring (doc[, b_ind[, t_ind[, a_ind[, xml_preface]]]])</a></td>
<td class="summary">Function to pretty-print an XML document.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Doc:tostring">Doc:tostring ([b_ind[, t_ind[, a_ind[, xml_preface="<?xml version='1.0'?>"]]]])</a></td>
<td class="summary">Method to pretty-print an XML document.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Doc:get_text">Doc:get_text ()</a></td>
<td class="summary">get the full text value of an element.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#clone">clone (doc[, strsubst])</a></td>
<td class="summary">Returns a copy of a document.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Doc:filter">Doc:filter ([strsubst])</a></td>
<td class="summary">Returns a copy of a document.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#compare">compare (t1, t2)</a></td>
<td class="summary">Compare two documents or elements.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#is_tag">is_tag (d)</a></td>
<td class="summary">is this value a document element?</td>
</tr>
<tr>
<td class="name" nowrap><a href="#walk">walk (doc, depth_first, operation)</a></td>
<td class="summary">Calls a function recursively over Nodes in the document.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#parsehtml">parsehtml (s)</a></td>
<td class="summary">Parse a well-formed HTML file as a string.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#basic_parse">basic_parse (s, all_text, html)</a></td>
<td class="summary">Parse a simple XML document using a pure Lua parser based on Robero Ierusalimschy's original version.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Doc:match">Doc:match (pat)</a></td>
<td class="summary">does something...</td>
</tr>
</table>
<br/>
<br/>
<h2 class="section-header "><a name="Functions"></a>Functions</h2>
<dl class="function">
<dt>
<a name = "new"></a>
<strong>new (tag[, attr={}])</strong>
</dt>
<dd>
create a new document node.
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">tag</span>
<span class="types"><a class="type" href="https://www.lua.org/manual/5.4/manual.html#6.4">string</a></span>
the tag name
</li>
<li><span class="parameter">attr</span>
<span class="types"><a class="type" href="https://www.lua.org/manual/5.4/manual.html#6.6">table</a></span>
attributes (table of name-value pairs)
(<em>default</em> {})
</li>
</ul>
<h3>Returns:</h3>
<ol>
the Node object
</ol>
<h3>See also:</h3>
<ul>
<a href="../libraries/pl.xml.html#elem">xml.elem</a>
</ul>
<h3>Usage:</h3>
<ul>
<pre class="example"><span class="keyword">local</span> doc = xml.<span class="function-name">new</span>(<span class="string">"main"</span>, { hello = <span class="string">"world"</span>, answer = <span class="string">"42"</span> })
<span class="global">print</span>(doc) <span class="comment">--> <main hello='world' answer='42'/></span></pre>
</ul>
</dd>
<dt>
<a name = "parse"></a>
<strong>parse (text_or_filename, is_file, use_basic)</strong>
</dt>
<dd>
parse an XML document. By default, this uses lxp.lom.parse, but
falls back to basic_parse, or if <code>use_basic</code> is truthy
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">text_or_filename</span>
file or string representation
</li>
<li><span class="parameter">is_file</span>
whether text<em>or</em>file is a file name or not
</li>
<li><span class="parameter">use_basic</span>
do a basic parse
</li>
</ul>
<h3>Returns:</h3>
<ol>
<li>
a parsed LOM document with the document metatatables set</li>
<li>
nil, error the error can either be a file error or a parse error</li>
</ol>
</dd>
<dt>
<a name = "elem"></a>
<strong>elem (tag, items)</strong>
</dt>
<dd>
Create a Node with a set of children (text or Nodes) and attributes.
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">tag</span>
<span class="types"><a class="type" href="https://www.lua.org/manual/5.4/manual.html#6.4">string</a></span>
a tag name
</li>
<li><span class="parameter">items</span>
<span class="types"><a class="type" href="https://www.lua.org/manual/5.4/manual.html#6.6">table</a> or <a class="type" href="https://www.lua.org/manual/5.4/manual.html#6.4">string</a></span>
either a single child (text or Node), or a table where the hash
part is the attributes and the list part is the children (text or Nodes).
</li>
</ul>
<h3>Returns:</h3>
<ol>
the new Node
</ol>
<h3>See also:</h3>
<ul>
<li><a href="../libraries/pl.xml.html#new">xml.new</a></li>
<li><a href="../libraries/pl.xml.html#tags">xml.tags</a></li>
</ul>
<h3>Usage:</h3>
<ul>
<pre class="example"><span class="keyword">local</span> doc = xml.<span class="function-name">elem</span>(<span class="string">"top"</span>, <span class="string">"hello world"</span>) <span class="comment">-- <top>hello world</top>
</span><span class="keyword">local</span> doc = xml.<span class="function-name">elem</span>(<span class="string">"main"</span>, xml.<span class="function-name">new</span>(<span class="string">"child"</span>)) <span class="comment">-- <main><child/></main>
</span><span class="keyword">local</span> doc = xml.<span class="function-name">elem</span>(<span class="string">"main"</span>, { <span class="string">"this "</span>, <span class="string">"is "</span>, <span class="string">"nice"</span> }) <span class="comment">-- <main>this is nice</main>
</span><span class="keyword">local</span> doc = xml.<span class="function-name">elem</span>(<span class="string">"main"</span>, { xml.<span class="function-name">new</span> <span class="string">"this"</span>,
xml.<span class="function-name">new</span> <span class="string">"is"</span>,
xml.<span class="function-name">new</span> <span class="string">"nice"</span> }) <span class="comment">-- <main><this/><is/><nice/></main>
</span><span class="keyword">local</span> doc = xml.<span class="function-name">elem</span>(<span class="string">"main"</span>, { hello = <span class="string">"world"</span> }) <span class="comment">-- <main hello='world'/>
</span><span class="keyword">local</span> doc = xml.<span class="function-name">elem</span>(<span class="string">"main"</span>, {
<span class="string">"prefix"</span>,
xml.<span class="function-name">elem</span>(<span class="string">"child"</span>, { <span class="string">"this "</span>, <span class="string">"is "</span>, <span class="string">"nice"</span>}),
<span class="string">"postfix"</span>,
attrib = <span class="string">"value"</span>
}) <span class="comment">-- <main attrib='value'>prefix<child>this is nice</child>postfix</main>"</span></pre>
</ul>
</dd>
<dt>
<a name = "tags"></a>
<strong>tags (list)</strong>
</dt>
<dd>
given a list of names, return a number of element constructors.
If passing a comma-separated string, then whitespace surrounding the values
will be stripped.</p>
<p> The returned constructor functions are a shortcut to <a href="../libraries/pl.xml.html#elem">xml.elem</a> where you
no longer provide the tag-name, but only the <code>items</code> table.
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">list</span>
<span class="types"><a class="type" href="https://www.lua.org/manual/5.4/manual.html#6.4">string</a> or <a class="type" href="https://www.lua.org/manual/5.4/manual.html#6.6">table</a></span>
a list of names, or a comma-separated string.
</li>
</ul>
<h3>Returns:</h3>
<ol>
(multiple) constructor functions; <code>function(items)</code>. For the <code>items</code>
parameter see <a href="../libraries/pl.xml.html#elem">xml.elem</a>.
</ol>
<h3>See also:</h3>
<ul>
<a href="../libraries/pl.xml.html#elem">xml.elem</a>
</ul>
<h3>Usage:</h3>
<ul>
<pre class="example"><span class="keyword">local</span> new_parent, new_child = xml.<span class="function-name">tags</span> <span class="string">'mom, kid'</span>
doc = <span class="function-name">new_parent</span> {<span class="function-name">new_child</span> <span class="string">'Bob'</span>, <span class="function-name">new_child</span> <span class="string">'Annie'</span>}
<span class="comment">-- <mom><kid>Bob</kid><kid>Annie</kid></mom></span></pre>
</ul>
</dd>
<dt>
<a name = "Doc:addtag"></a>
<strong>Doc:addtag (tag[, attrs={}])</strong>
</dt>
<dd>
Adds a document Node, at current position.
This updates the last inserted position to the new Node.
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">tag</span>
<span class="types"><a class="type" href="https://www.lua.org/manual/5.4/manual.html#6.4">string</a></span>
the tag name
</li>
<li><span class="parameter">attrs</span>
<span class="types"><a class="type" href="https://www.lua.org/manual/5.4/manual.html#6.6">table</a></span>
attributes (table of name-value pairs)
(<em>default</em> {})
</li>
</ul>
<h3>Returns:</h3>
<ol>
the current node (<code>self</code>)
</ol>
<h3>Usage:</h3>
<ul>
<pre class="example"><span class="keyword">local</span> doc = xml.<span class="function-name">new</span>(<span class="string">"main"</span>)
doc:<span class="function-name">addtag</span>(<span class="string">"penlight"</span>, { hello = <span class="string">"world"</span>})
doc:<span class="function-name">addtag</span>(<span class="string">"expat"</span>) <span class="comment">-- added to 'penlight' since position moved
</span><span class="global">print</span>(doc) <span class="comment">--> <main><penlight hello='world'><expat/></penlight></main></span></pre>
</ul>
</dd>
<dt>
<a name = "Doc:text"></a>
<strong>Doc:text (text)</strong>
</dt>
<dd>
Adds a text node, at current position.
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">text</span>
<span class="types"><a class="type" href="https://www.lua.org/manual/5.4/manual.html#6.4">string</a></span>
a string
</li>
</ul>
<h3>Returns:</h3>
<ol>
the current node (<code>self</code>)
</ol>
<h3>Usage:</h3>
<ul>
<pre class="example"><span class="keyword">local</span> doc = xml.<span class="function-name">new</span>(<span class="string">"main"</span>)
doc:<span class="function-name">text</span>(<span class="string">"penlight"</span>)
doc:<span class="function-name">text</span>(<span class="string">"expat"</span>)
<span class="global">print</span>(doc) <span class="comment">--> <main><penlightexpat</main></span></pre>
</ul>
</dd>
<dt>
<a name = "Doc:up"></a>
<strong>Doc:up ()</strong>
</dt>
<dd>
Moves current position up one level.
<h3>Returns:</h3>
<ol>
the current node (<code>self</code>)
</ol>
</dd>
<dt>
<a name = "Doc:reset"></a>
<strong>Doc:reset ()</strong>
</dt>
<dd>
Resets current position to top level.
Resets to the <code>self</code> node.
<h3>Returns:</h3>
<ol>
the current node (<code>self</code>)
</ol>
</dd>
<dt>
<a name = "Doc:add_direct_child"></a>
<strong>Doc:add_direct_child (child)</strong>
</dt>
<dd>
Append a child to the current Node (ignoring current position).
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">child</span>
a child node (either text or a document)
</li>
</ul>
<h3>Returns:</h3>
<ol>
the current node (<code>self</code>)
</ol>
<h3>Usage:</h3>
<ul>
<pre class="example"><span class="keyword">local</span> doc = xml.<span class="function-name">new</span>(<span class="string">"main"</span>)
doc:<span class="function-name">add_direct_child</span>(<span class="string">"dog"</span>)
doc:<span class="function-name">add_direct_child</span>(xml.<span class="function-name">new</span>(<span class="string">"child"</span>))
doc:<span class="function-name">add_direct_child</span>(<span class="string">"cat"</span>)
<span class="global">print</span>(doc) <span class="comment">--> <main>dog<child/>cat</main></span></pre>
</ul>
</dd>
<dt>
<a name = "Doc:add_child"></a>
<strong>Doc:add_child (child)</strong>
</dt>
<dd>
Append a child at the current position (without changing position).
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">child</span>
a child node (either text or a document)
</li>
</ul>
<h3>Returns:</h3>
<ol>
the current node (<code>self</code>)
</ol>
<h3>Usage:</h3>
<ul>
<pre class="example"><span class="keyword">local</span> doc = xml.<span class="function-name">new</span>(<span class="string">"main"</span>)
doc:<span class="function-name">addtag</span>(<span class="string">"one"</span>)
doc:<span class="function-name">add_child</span>(xml.<span class="function-name">new</span>(<span class="string">"item1"</span>))
doc:<span class="function-name">add_child</span>(xml.<span class="function-name">new</span>(<span class="string">"item2"</span>))
doc:<span class="function-name">add_child</span>(xml.<span class="function-name">new</span>(<span class="string">"item3"</span>))
<span class="global">print</span>(doc) <span class="comment">--> <main><one><item1/><item2/><item3/></one></main></span></pre>
</ul>
</dd>
<dt>
<a name = "Doc:set_attribs"></a>
<strong>Doc:set_attribs (t)</strong>
</dt>
<dd>
Set attributes of a document node.
Will add/overwrite values, but will not remove existing ones.
Operates on the Node itself, will not take position into account.
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">t</span>
<span class="types"><a class="type" href="https://www.lua.org/manual/5.4/manual.html#6.6">table</a></span>
a table containing attribute/value pairs
</li>
</ul>
<h3>Returns:</h3>
<ol>
the current node (<code>self</code>)
</ol>
</dd>
<dt>
<a name = "Doc:set_attrib"></a>
<strong>Doc:set_attrib (a, v)</strong>
</dt>
<dd>
Set a single attribute of a document node.
Operates on the Node itself, will not take position into account.
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">a</span>
attribute
</li>
<li><span class="parameter">v</span>
its value, pass in <code>nil</code> to delete the attribute
</li>
</ul>
<h3>Returns:</h3>
<ol>
the current node (<code>self</code>)
</ol>
</dd>
<dt>
<a name = "Doc:get_attribs"></a>
<strong>Doc:get_attribs ()</strong>
</dt>
<dd>
Gets the attributes of a document node.
Operates on the Node itself, will not take position into account.
<h3>Returns:</h3>
<ol>
table with attributes (attribute/value pairs)
</ol>
</dd>
<dt>
<a name = "Doc.subst"></a>
<strong>Doc.subst (template, data)</strong>
</dt>
<dd>
create a substituted copy of a document,
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">template</span>
may be a document or a string representation which will be parsed and cached
</li>
<li><span class="parameter">data</span>
a table of name-value pairs or a list of such tables
</li>
</ul>
<h3>Returns:</h3>
<ol>
an XML document
</ol>
</dd>
<dt>
<a name = "Doc:child_with_name"></a>
<strong>Doc:child_with_name (tag)</strong>
</dt>
<dd>
Return the first child with a given tag name (non-recursive).
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">tag</span>
the tag name
</li>
</ul>
<h3>Returns:</h3>
<ol>
the child Node found or <code>nil</code> if not found
</ol>
</dd>
<dt>
<a name = "Doc:get_elements_with_name"></a>
<strong>Doc:get_elements_with_name (tag[, dont_recurse=false])</strong>
</dt>
<dd>
Returns all elements in a document that have a given tag.
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">tag</span>
<span class="types"><a class="type" href="https://www.lua.org/manual/5.4/manual.html#6.4">string</a></span>
a tag name
</li>
<li><span class="parameter">dont_recurse</span>
<span class="types"><span class="type">boolean</span></span>
optionally only return the immediate children with this tag name
(<em>default</em> false)
</li>
</ul>
<h3>Returns:</h3>
<ol>
a list of elements found, list will be empty if none was found.
</ol>
</dd>
<dt>
<a name = "Doc:children"></a>
<strong>Doc:children ()</strong>
</dt>
<dd>
Iterator over all children of a document node, including text nodes.
This function is not recursive, so returns only direct child nodes.
<h3>Returns:</h3>
<ol>
iterator that returns a single Node per iteration.
</ol>
</dd>
<dt>
<a name = "Doc:first_childtag"></a>
<strong>Doc:first_childtag ()</strong>
</dt>
<dd>
Return the first child element of a node, if it exists.
This will skip text nodes.
<h3>Returns:</h3>
<ol>
first child Node or <code>nil</code> if there is none.
</ol>
</dd>
<dt>
<a name = "Doc:matching_tags"></a>
<strong>Doc:matching_tags ([tag=nil[, xmlns=nil]])</strong>
</dt>
<dd>
Iterator that matches tag names, and a namespace (non-recursive).
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">tag</span>
<span class="types"><a class="type" href="https://www.lua.org/manual/5.4/manual.html#6.4">string</a></span>
tag names to return. Returns all tags if not provided.
(<em>default</em> nil)
</li>
<li><span class="parameter">xmlns</span>
<span class="types"><a class="type" href="https://www.lua.org/manual/5.4/manual.html#6.4">string</a></span>
the namespace value ('xmlns' attribute) to return. If not
provided will match all namespaces.
(<em>default</em> nil)
</li>
</ul>
<h3>Returns:</h3>
<ol>
iterator that returns a single Node per iteration.
</ol>
</dd>
<dt>
<a name = "Doc:childtags"></a>
<strong>Doc:childtags ()</strong>
</dt>
<dd>
Iterator over all child tags of a document node. This will skip over
text nodes.
<h3>Returns:</h3>
<ol>
iterator that returns a single Node per iteration.
</ol>
</dd>
<dt>
<a name = "Doc:maptags"></a>
<strong>Doc:maptags (callback)</strong>
</dt>
<dd>
Visit child Nodes of a node and call a function, possibly modifying the document.
Text elements will be skipped.
This is not recursive, so only direct children will be passed.
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">callback</span>
<span class="types"><span class="type">function</span></span>
a function with signature <code>function(node)</code>, passed the node.
The element will be updated with the returned value, or deleted if it returns <code>nil</code>.
</li>
</ul>
</dd>
<dt>
<a name = "xml_escape"></a>
<strong>xml_escape (str)</strong>
</dt>
<dd>
Escapes a string for safe use in xml.
Handles quotes(single+double), less-than, greater-than, and ampersand.
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">str</span>
<span class="types"><a class="type" href="https://www.lua.org/manual/5.4/manual.html#6.4">string</a></span>
string value to escape
</li>
</ul>
<h3>Returns:</h3>
<ol>
escaped string
</ol>
<h3>Usage:</h3>
<ul>
<pre class="example"><span class="keyword">local</span> esc = xml.<span class="function-name">xml_escape</span>(<span class="string">[["'<>&]]</span>) <span class="comment">--> "&quot;&apos;&lt;&gt;&amp;"</span></pre>
</ul>
</dd>
<dt>
<a name = "xml_unescape"></a>
<strong>xml_unescape (str)</strong>
</dt>
<dd>
Unescapes a string from xml.
Handles quotes(single+double), less-than, greater-than, and ampersand.
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">str</span>
<span class="types"><a class="type" href="https://www.lua.org/manual/5.4/manual.html#6.4">string</a></span>
string value to unescape
</li>
</ul>
<h3>Returns:</h3>
<ol>
unescaped string
</ol>
<h3>Usage:</h3>
<ul>
<pre class="example"><span class="keyword">local</span> unesc = xml.<span class="function-name">xml_escape</span>(<span class="string">"&quot;&apos;&lt;&gt;&amp;"</span>) <span class="comment">--> [["'<>&]]</span></pre>
</ul>
</dd>
<dt>
<a name = "tostring"></a>
<strong>tostring (doc[, b_ind[, t_ind[, a_ind[, xml_preface]]]])</strong>
</dt>
<dd>
Function to pretty-print an XML document.
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">doc</span>
an XML document
</li>
<li><span class="parameter">b_ind</span>
<span class="types"><a class="type" href="https://www.lua.org/manual/5.4/manual.html#6.4">string</a> or <span class="type">int</span></span>
an initial block-indent (required when <code>t_ind</code> is set)
(<em>optional</em>)
</li>
<li><span class="parameter">t_ind</span>
<span class="types"><a class="type" href="https://www.lua.org/manual/5.4/manual.html#6.4">string</a> or <span class="type">int</span></span>
an tag-indent for each level (required when <code>a_ind</code> is set)
(<em>optional</em>)
</li>
<li><span class="parameter">a_ind</span>
<span class="types"><a class="type" href="https://www.lua.org/manual/5.4/manual.html#6.4">string</a> or <span class="type">int</span></span>
if given, indent each attribute pair and put on a separate line
(<em>optional</em>)
</li>
<li><span class="parameter">xml_preface</span>
<span class="types"><a class="type" href="https://www.lua.org/manual/5.4/manual.html#6.4">string</a> or <span class="type">bool</span></span>
force prefacing with default or custom <?xml...>, if truthy then <code>&lt;?xml version='1.0'?&gt;</code> will be used as default.
(<em>optional</em>)
</li>
</ul>
<h3>Returns:</h3>
<ol>
a string representation
</ol>
<h3>See also:</h3>
<ul>
<a href="../libraries/pl.xml.html#Doc:tostring">Doc:tostring</a>
</ul>
</dd>
<dt>
<a name = "Doc:tostring"></a>
<strong>Doc:tostring ([b_ind[, t_ind[, a_ind[, xml_preface="<?xml version='1.0'?>"]]]])</strong>
</dt>
<dd>
Method to pretty-print an XML document.
Invokes <a href="../libraries/pl.xml.html#tostring">xml.tostring</a>.
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">b_ind</span>
<span class="types"><a class="type" href="https://www.lua.org/manual/5.4/manual.html#6.4">string</a> or <span class="type">int</span></span>
an initial indent (required when <code>t_ind</code> is set)
(<em>optional</em>)
</li>
<li><span class="parameter">t_ind</span>
<span class="types"><a class="type" href="https://www.lua.org/manual/5.4/manual.html#6.4">string</a> or <span class="type">int</span></span>
an indent for each level (required when <code>a_ind</code> is set)
(<em>optional</em>)
</li>
<li><span class="parameter">a_ind</span>
<span class="types"><a class="type" href="https://www.lua.org/manual/5.4/manual.html#6.4">string</a> or <span class="type">int</span></span>
if given, indent each attribute pair and put on a separate line
(<em>optional</em>)
</li>
<li><span class="parameter">xml_preface</span>
<span class="types"><a class="type" href="https://www.lua.org/manual/5.4/manual.html#6.4">string</a></span>
force prefacing with default or custom <?xml...>
(<em>default</em> "<?xml version='1.0'?>")
</li>
</ul>
<h3>Returns:</h3>
<ol>
a string representation
</ol>
<h3>See also:</h3>
<ul>
<a href="../libraries/pl.xml.html#tostring">xml.tostring</a>
</ul>
</dd>
<dt>
<a name = "Doc:get_text"></a>
<strong>Doc:get_text ()</strong>
</dt>
<dd>
get the full text value of an element.
<h3>Returns:</h3>
<ol>
a single string with all text elements concatenated
</ol>
<h3>Usage:</h3>
<ul>
<pre class="example"><span class="keyword">local</span> doc = xml.<span class="function-name">new</span>(<span class="string">"main"</span>)
doc:<span class="function-name">text</span>(<span class="string">"one"</span>)
doc:<span class="function-name">add_child</span>(xml.<span class="function-name">elem</span> <span class="string">"two"</span>)
doc:<span class="function-name">text</span>(<span class="string">"three"</span>)
<span class="keyword">local</span> t = doc:<span class="function-name">get_text</span>() <span class="comment">--> "onethree"</span></pre>
</ul>
</dd>
<dt>
<a name = "clone"></a>
<strong>clone (doc[, strsubst])</strong>
</dt>
<dd>
<p>Returns a copy of a document.
The <code>strsubst</code> parameter is a callback with signature <code>function(object, kind, parent)</code>.</p>
<p> Param <code>kind</code> has the following values, and parameters:</p>
<ul>
<li><p><code>"*TAG"</code>: <code>object</code> is the tag-name, <code>parent</code> is the Node object. Returns the new tag name.</p></li>
<li><p><code>"*TEXT"</code>: <code>object</code> is the text-element, <code>parent</code> is the Node object. Returns the new text value.</p></li>
<li><p>other strings not prefixed with <code>*</code>: <code>kind</code> is the attribute name, <code>object</code> is the
attribute value, <code>parent</code> is the Node object. Returns the new attribute value.</p></li>
</ul>
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">doc</span>
<span class="types"><span class="type">Node</span> or <a class="type" href="https://www.lua.org/manual/5.4/manual.html#6.4">string</a></span>
a Node object or string (text node)
</li>
<li><span class="parameter">strsubst</span>
<span class="types"><span class="type">function</span></span>
an optional function for handling string copying
which could do substitution, etc.
(<em>optional</em>)
</li>
</ul>
<h3>Returns:</h3>
<ol>
copy of the document
</ol>
<h3>See also:</h3>
<ul>
<a href="../libraries/pl.xml.html#Doc:filter">Doc:filter</a>
</ul>
</dd>
<dt>
<a name = "Doc:filter"></a>
<strong>Doc:filter ([strsubst])</strong>
</dt>
<dd>
Returns a copy of a document.
This is the method version of <a href="../libraries/pl.xml.html#clone">xml.clone</a>.
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">strsubst</span>
<span class="types"><span class="type">function</span></span>
an optional function for handling string copying
(<em>optional</em>)
</li>
</ul>
<h3>See also:</h3>
<ul>
<a href="../libraries/pl.xml.html#clone">xml.clone</a>
</ul>
</dd>
<dt>
<a name = "compare"></a>
<strong>compare (t1, t2)</strong>
</dt>
<dd>
Compare two documents or elements.
Equality is based on tag, child nodes (text and tags), attributes and order
of those (order only fails if both are given, and not equal).
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">t1</span>
<span class="types"><span class="type">Node</span> or <a class="type" href="https://www.lua.org/manual/5.4/manual.html#6.4">string</a></span>
a Node object or string (text node)
</li>
<li><span class="parameter">t2</span>
<span class="types"><span class="type">Node</span> or <a class="type" href="https://www.lua.org/manual/5.4/manual.html#6.4">string</a></span>
a Node object or string (text node)
</li>
</ul>
<h3>Returns:</h3>
<ol>
<span class="types"><span class="type">boolean</span></span>
<code>true</code> when the Nodes are equal.
</ol>
</dd>
<dt>
<a name = "is_tag"></a>
<strong>is_tag (d)</strong>
</dt>
<dd>
is this value a document element?
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">d</span>
any value
</li>
</ul>
<h3>Returns:</h3>
<ol>
<span class="types"><span class="type">boolean</span></span>
<code>true</code> if it is a <a href="https://www.lua.org/manual/5.4/manual.html#6.6">table</a> with property <code>tag</code> being a string value.
</ol>
</dd>
<dt>
<a name = "walk"></a>
<strong>walk (doc, depth_first, operation)</strong>
</dt>
<dd>
Calls a function recursively over Nodes in the document.
Will only call on tags, it will skip text nodes.
The function signature for <code>operation</code> is <code>function(tag_name, Node)</code>.
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">doc</span>
<span class="types"><span class="type">Node</span> or <a class="type" href="https://www.lua.org/manual/5.4/manual.html#6.4">string</a></span>
a Node object or string (text node)
</li>
<li><span class="parameter">depth_first</span>
<span class="types"><span class="type">boolean</span></span>
visit child nodes first, then the current node
</li>
<li><span class="parameter">operation</span>
<span class="types"><span class="type">function</span></span>
a function which will receive the current tag name and current node.
</li>
</ul>
</dd>
<dt>
<a name = "parsehtml"></a>
<strong>parsehtml (s)</strong>
</dt>
<dd>
Parse a well-formed HTML file as a string.
Tags are case-insensitive, DOCTYPE is ignored, and empty elements can be .. empty.
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">s</span>
the HTML
</li>
</ul>
</dd>
<dt>
<a name = "basic_parse"></a>
<strong>basic_parse (s, all_text, html)</strong>
</dt>
<dd>
Parse a simple XML document using a pure Lua parser based on Robero Ierusalimschy's original version.
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">s</span>
the XML document to be parsed.
</li>
<li><span class="parameter">all_text</span>
if true, preserves all whitespace. Otherwise only text containing non-whitespace is included.
</li>
<li><span class="parameter">html</span>
if true, uses relaxed HTML rules for parsing
</li>
</ul>
</dd>
<dt>
<a name = "Doc:match"></a>
<strong>Doc:match (pat)</strong>
</dt>
<dd>
does something...
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">pat</span>
</li>
</ul>
</dd>
</dl>
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