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<html><head>
<title>Nyquist</title>
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<body>
<a href="../start.htm">Nyquist / XLISP 2.0</a> -
<a href="../manual/contents.htm">Contents</a> |
<a href="tutorials.htm">Tutorials</a> |
<a href="../examples/examples.htm">Examples</a> |
<a href="../reference/reference-index.htm">Reference</a>
<hr>
<h1>Nyquist</h1>
<hr>
<ul>
<li><nobr><a href="#debugger-shortcuts">Debugger Shortcuts</a></nobr></li>
<li><nobr><a href="#grindef">grindef</a> - print the function definition of a closure</nobr></li>
<li><nobr><a href="#args">args</a> - print the argument list of a closure</nobr></li>
<li><nobr><a href="#setfn">setfn</a> - define 'alias' names for functions</nobr></li>
<li><nobr><a href="#display">display</a> - framework for debug messages</nobr></li>
</ul>
<p>This page will not save you from reading the Nyquist manual, it's a list
of things I find useful but frequently have to look them up in the manuals
when I haven't worked with Nyquist for a while. Many more useful tricks can
be found in the 'Developing and Debugging in Nyquist' chapter in the Nyquist
manual.</p>
<a name="debugger-shortcuts"></a>
<hr>
<h2>Debugger Shortcuts</h2>
<hr>
<p>Some Nyquist/XLISP debugger shortcuts, defined in 'xlinit.lsp' and
'misc.lsp':</p>
<p><table cellpadding="0" cellspacing="0"><tbody>
<tr>
<td><nobr><code> </code></nobr></td>
<td valign="top">
<table cellpadding="0" cellspacing="0" width="100%"><tbody>
<tr valign="top">
<td class="button"><nobr><code>(bt)</code></nobr></td>
</tr>
</tbody></table>
</td>
<td><nobr> → </nobr></td>
<td width="100%"><a href="../reference/baktrace.htm">baktrace</a></td>
</tr>
<tr>
<td height="2px"></td>
</tr>
<tr>
<td><nobr><code> </code></nobr></td>
<td valign="top">
<table cellpadding="0" cellspacing="0" width="100%"><tbody>
<tr valign="top">
<td class="button"><nobr><code>(co)</code></nobr></td>
</tr>
</tbody></table>
</td>
<td><nobr> → </nobr></td>
<td width="100%"><a href="../reference/continue.htm">continue</a></td>
</tr>
<tr>
<td height="2px"></td>
</tr>
<tr>
<td><nobr><code> </code></nobr></td>
<td valign="top">
<table cellpadding="0" cellspacing="0" width="100%"><tbody>
<tr valign="top">
<td class="button"><nobr><code>(top)</code></nobr></td>
</tr>
</tbody></table>
</td>
<td><nobr> → </nobr></td>
<td width="100%"><a href="../reference/top-level.htm">top-level</a></td>
</tr>
<tr>
<td><nobr><font size="-2"> </font></nobr></td>
</tr>
<tr>
<td><nobr><code> </code></nobr></td>
<td valign="top">
<table cellpadding="0" cellspacing="0" width="100%"><tbody>
<tr valign="top">
<td class="button"><nobr><code>(res)</code></nobr></td>
</tr>
</tbody></table>
</td>
<td><nobr> → </nobr></td>
<td width="100%"><a href="../reference/clean-up.htm">clean-up</a></td>
</tr>
<tr>
<td height="2px"></td>
</tr>
<tr>
<td><nobr><code> </code></nobr></td>
<td valign="top">
<table cellpadding="0" cellspacing="0" width="100%"><tbody>
<tr valign="top">
<td class="button"><nobr><code>(up)</code></nobr></td>
</tr>
</tbody></table>
</td>
<td><nobr> → </nobr></td>
<td width="100%"><a href="../reference/clean-up.htm">clean-up</a></td>
</tr>
</tbody></table></p>
<p>The debugger commands only work if
<a href="../reference/global-breakenable.htm">*breakenable*</a>
is <nobr>non-<a href="../reference/nil.htm">NIL</a></nobr>:</p>
<p><table cellpadding="0" cellspacing="0"><tbody>
<tr>
<td><nobr><code> </code></nobr></td>
<td valign="top">
<table cellpadding="0" cellspacing="0" width="100%"><tbody>
<tr valign="top">
<td class="button"><nobr><code>(bkon)</code></nobr></td>
</tr>
</tbody></table>
</td>
<td><nobr> → </nobr></td>
<td width="100%"><nobr>(setq
<a href="../reference/global-breakenable.htm">*breakenable*</a>
t)</nobr></td>
</tr>
<tr>
<td height="2px"></td>
</tr>
<tr>
<td><nobr><code> </code></nobr></td>
<td valign="top">
<table cellpadding="0" cellspacing="0" width="100%"><tbody>
<tr valign="top">
<td class="button"><nobr><code>(bkoff)</code></nobr></td>
</tr>
</tbody></table>
</td>
<td><nobr> → </nobr></td>
<td width="100%"><nobr>(setq
<a href="../reference/global-breakenable.htm">*breakenable*</a>
nil)</nobr></td>
</tr>
</tbody></table></p>
<p>You can make your own
<a href="../reference/global-tracenable.htm">*tracenable*</a>
shortcuts like shown here:</p>
<pre class="example">
(defun <font color="#0000CC">tron</font> ()
(setq <font color="#AA5500">*tracenable*</font> t))
(defun <font color="#0000CC">troff</font> ()
(setq <font color="#AA5500">*tracenable*</font> nil))
</pre>
<p>See also:</p>
<ul>
<li><nobr>XLISP 2.0 Manual → <a href="../manual/xlisp.htm#break-loop">Break Loop</a></nobr></li>
</ul>
<p><nobr> <a href="#top">Back to top</a></nobr></p>
<a name="grindef"></a>
<hr>
<h2>grindef</h2>
<hr>
<p>The 'grindef' function prints the Lisp code of a
<a href="../manual/xlisp.htm#data-types">closure</a> <nobr>[user-defined</nobr>
function or macro]:</p>
<pre class="example">
(defun <font color="#0000CC">grindef</font> (e)
(pprint (get-lambda-expression (symbol-function e))))
</pre>
<p>Example:</p>
<pre class="example">
> (grindef 'grindef)
(LAMBDA (E)
(PPRINT (GET-LAMBDA-EXPRESSION (SYMBOL-FUNCTION E))))
NIL
</pre>
<p><nobr> <a href="#top">Back to top</a></nobr></p>
<a name="args"></a>
<hr>
<h2>args</h2>
<hr>
<p>The 'args' function prints the name and the argument variables of a
<a href="../manual/xlisp.htm#data-types">closure</a> <nobr>[user-defined</nobr>
function or macro]:</p>
<pre class="example">
(defun <font color="#0000CC">args</font> (e)
(pprint (cons e (second (get-lambda-expression (symbol-function e))))))
</pre>
<p>Example:</p>
<pre class="example">
> (args 'args)
(ARGS E)
NIL
</pre>
<p><nobr> <a href="#top">Back to top</a></nobr></p>
<a name="setfn"></a>
<hr>
<h2>setfn</h2>
<hr>
<p>The 'setfn' macro defines 'alias' names for functions:</p>
<pre class="example">
(defmacro <font color="#0000CC">setfn</font> (a b)
`(setf (symbol-function ',a) (symbol-function ',b)))
</pre>
<p>Examples from 'xlinit.lsp':</p>
<pre class="example">
(setfn co continue)
(setfn top top-level)
(setfn res clean-up)
(setfn up clean-up)
</pre>
<p><nobr> <a href="#top">Back to top</a></nobr></p>
<a name="display"></a>
<hr>
<h2>display</h2>
<hr>
<p>'display' is a debugging macro, defined in 'xlinit.lsp'.</p>
<pre class="example">
(defmacro <font color="#0000CC">display-macro</font> (label &rest items)
(let ($res$)
(dolist ($item$ items)
(setq $res$ (cons
`(format t <font color="#880000">"~A = ~A "</font> ',$item$ ,$item$)
$res$)))
(append (list 'let nil `(format t <font color="#880000">"~A : "</font> ,label))
(reverse $res$)
'((terpri)))))
(defun <font color="#0000CC">display-on</font> ()
(setfn display display-macro) t)
(defun <font color="#0000CC">display-off</font> ()
(setfn display or) nil)
</pre>
<p>Usage:</p>
<pre class="example">
(display <font color="#880000">"heading"</font> <font color="#0000CC">var1 var2</font> ...)
</pre>
<p>expands into:</p>
<pre class="example">
(let ()
(format t "~A: " <font color="#880000">"heading"</font>)
(format t "~A = ~A " ',<font color="#0000CC">var1</font> ,<font color="#0000CC">var1</font>)
(format t "~A = ~A " ',<font color="#0000CC">var2</font> ,<font color="#0000CC">var2</font>)
... )
</pre>
<p>and then prints:</p>
<pre class="example">
<font color="#0000CC">heading</font> : <font color="#0000CC">VAR1</font> = <font color="#0000CC">value1 VAR2</font> = <font color="#0000CC">value2</font> ...
</pre>
<p>Using the 'display' macro in a function like shown here:</p>
<pre class="example">
(defun <font color="#0000CC">hello</font> ()
(let ((local-var 'hello))
(display <font color="#880000">"debug message"</font> local-var)
local-var)) <font color="#008844">; return value</font>
</pre>
<p>Now the '<nobr>debug message</nobr>' can be switched on and off without
changing the code:</p>
<pre class="example">
> (display-on)
T
> (hello)
debug message : LOCAL-VAR = HELLO
HELLO
> (display-off)
NIL
> (hello)
HELLO
</pre>
<p><nobr> <a href="#top">Back to top</a></nobr></p>
<hr>
<a href="../start.htm">Nyquist / XLISP 2.0</a> -
<a href="../manual/contents.htm">Contents</a> |
<a href="tutorials.htm">Tutorials</a> |
<a href="../examples/examples.htm">Examples</a> |
<a href="../reference/reference-index.htm">Reference</a>
</body></html>
|
