content/glyph/book/macros/macros_core.html
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permalink: t_49
title: Glyph – Core Macros
type: page
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<nav class="navigation"><a href="/glyph/book/ref_commands.html">← Command Reference</a> | <a href="/glyph/book/index.html">Contents</a> | <a href="/glyph/book/macros/macros_block.html">Block Macros →</a></nav>
<section class="section">
<header><h1 id="m_add" class="toc"><code>add</code></h1></header>
<p>Adds two or more integers together.</p>
<p><strong>Example:</strong> <code>add[2|5|7]</code></p>
</section>
<section class="section">
<header><h1 id="m_alias" class="toc"><code>alias</code></h1></header>
<p>Creates a macro alias.</p>
<p><strong>Example:</strong> <code>alias[s|section]</code></p>
<section class="section">
<header><h1 id="h_142" class="notoc">Parameters</h1></header>
<table style="width:100%;">
<tr>
<th style="width:30%">Parameter</th>
<th>Description</th>
</tr>
<tr>
<td>0</td>
<td>The name of the alias.</td>
</tr>
<tr>
<td>1</td>
<td>The name of an existing macro.</td>
</tr>
</table>
</section>
</section>
<section class="section">
<header><h1 id="m_and" class="toc"><code>and</code></h1></header>
<p>Conditional <code>and</code> operator, to be used with the <a href="#m_condition"><code>condition</code></a> macro.</p>
<p><strong>Example:</strong> <code>?[and[true|false]|This is never displayed.]</code></p>
<section class="section">
<header><h1 id="h_144" class="notoc">Parameters</h1></header>
<table style="width:100%;">
<tr>
<th style="width:30%">Parameter</th>
<th>Description</th>
</tr>
<tr>
<td>0</td>
<td>The first expression to test</td>
</tr>
<tr>
<td>1</td>
<td>The second expression to test</td>
</tr>
</table>
</section>
</section>
<section class="section">
<header><h1 id="m_attribute" class="toc"><code>attribute</code></h1></header>
<p>Returns the value of the specified attribute. For a more complete example, see the <a href="#m_let"><code>let</code></a> macro.</p>
<strong>Aliases:</strong> <code>@</code>
<p><strong>Example:</strong> <code>@[title]</code></p>
<section class="section">
<header><h1 id="h_146" class="notoc">Parameters</h1></header>
<table style="width:100%;">
<tr>
<th style="width:30%">Parameter</th>
<th>Description</th>
</tr>
<tr>
<td>0</td>
<td>The name of the attribute to retrieve.</td>
</tr>
</table>
</section>
</section>
<section class="section">
<header><h1 id="m_attribute_" class="toc"><code>attribute:</code></h1></header>
<p>Sets the value of the specified attribute. For a more complete example, see the ‡‡‡‡‡PLACEHOLDER¤277‡‡‡‡‡ macro.</p>
<strong>Aliases:</strong> <code>@:</code>
<p><strong>Example:</strong> <code>@:[title|Test Title]</code></p>
<section class="section">
<header><h1 id="h_148" class="notoc">Parameters</h1></header>
<table style="width:100%;">
<tr>
<th style="width:30%">Parameter</th>
<th>Description</th>
</tr>
<tr>
<td>0</td>
<td>The name of the attribute to set.</td>
</tr>
<tr>
<td>1</td>
<td>The value of the attribute.</td>
</tr>
</table>
</section>
</section>
<section class="section">
<header><h1 id="m_comment" class="toc"><code>comment</code></h1></header>
<p>Evaluates to nothing. Used to add comments in a Glyph document that will not be displayed in output files.</p>
<strong>Aliases:</strong> <code>--</code>
<p><strong>Example:</strong> <code>--[=>[#link|This link will not be evaluated]]</code></p>
<section class="section">
<header><h1 id="h_150" class="notoc">Parameters</h1></header>
<table style="width:100%;">
<tr>
<th style="width:30%">Parameter</th>
<th>Description</th>
</tr>
<tr>
<td>0</td>
<td>The contents to comment out</td>
</tr>
</table>
</section>
<section class="section">
<header><h1 id="h_151" class="notoc">Remarks</h1></header>
<p>Macros are not expanded within comments.</p>
</section>
</section>
<section class="section">
<header><h1 id="m_condition" class="toc"><code>condition</code></h1></header>
<p>Tests a conditional expression. For more information, see <a href="/glyph/book/text_editing/conditionals.html#cond_macros">Conditional Macros</a>.</p>
<strong>Aliases:</strong> <code>?</code>
<section class="section">
<header><h1 id="h_153" class="notoc">Parameters</h1></header>
<table style="width:100%;">
<tr>
<th style="width:30%">Parameter</th>
<th>Description</th>
</tr>
<tr>
<td>0</td>
<td>The condition to test</td>
</tr>
<tr>
<td>1</td>
<td>The contents to expand if the condition is satisfied.</td>
</tr>
</table>
</section>
<section class="section">
<header><h1 id="h_154" class="notoc">Remarks</h1></header>
<p>For examples see any of the following:</p>
<ul>
<li><a href="#m_and"><code>and</code></a> macro</li>
<li><a href="#m_or"><code>or</code></a> macro</li>
<li><a href="#m_not"><code>not</code></a> macro</li>
<li><a href="#m_match"><code>match</code></a> macro</li>
<li><a href="#m_eq"><code>eq</code></a> macro</li>
</ul>
</section>
</section>
<section class="section">
<header><h1 id="m_config" class="toc"><code>config</code></h1></header>
<p>Returns the value of a configuration setting.</p>
<strong>Aliases:</strong> <code>$</code>
<p><strong>Example:</strong> <code>$[document.author]</code></p>
<section class="section">
<header><h1 id="h_156" class="notoc">Parameters</h1></header>
<table style="width:100%;">
<tr>
<th style="width:30%">Parameter</th>
<th>Description</th>
</tr>
<tr>
<td>0</td>
<td>The full name of a configuration setting.</td>
</tr>
</table>
</section>
</section>
<section class="section">
<header><h1 id="m_config_" class="toc"><code>config:</code></h1></header>
<p>Sets the value of a configuration setting.</p>
<strong>Aliases:</strong> <code>$:</code>
<p><strong>Example:</strong> <code>$:[document.draft|true]</code></p>
<section class="section">
<header><h1 id="h_158" class="notoc">Parameters</h1></header>
<table style="width:100%;">
<tr>
<th style="width:30%">Parameter</th>
<th>Description</th>
</tr>
<tr>
<td>0</td>
<td>The full name of a configuration setting.</td>
</tr>
<tr>
<td>1</td>
<td>The new value of the configuration setting</td>
</tr>
</table>
</section>
<section class="section">
<header><h1 id="h_159" class="notoc">Remarks</h1></header>
<p>This macro cannot be used in <a href="/glyph/book/compiling/programmatic_usage.html#modes">safe mode</a>.</p>
</section>
</section>
<section class="section">
<header><h1 id="m_eq" class="toc"><code>eq</code></h1></header>
<p>Conditional equality operator, to be used with the <a href="#m_condition"><code>condition</code></a> macro.</p>
<p><strong>Example:</strong> <code>?[eq[$[document.draft]|true]|This is displayed only in draft documents.]</code></p>
<section class="section">
<header><h1 id="h_161" class="notoc">Parameters</h1></header>
<table style="width:100%;">
<tr>
<th style="width:30%">Parameter</th>
<th>Description</th>
</tr>
<tr>
<td>0</td>
<td>The first expression to test</td>
</tr>
<tr>
<td>1</td>
<td>The second expression to test</td>
</tr>
</table>
</section>
</section>
<section class="section">
<header><h1 id="m_escape" class="toc"><code>escape</code></h1></header>
<p>Evaluates to its value. Commonly used with the escaping delimiters <code>[=</code> and <code>=]</code>.</p>
<strong>Aliases:</strong> <code>.</code>
<p><strong>Example:</strong> <code>.[=Macros are escaped here =>[#test].=]</code></p>
<section class="section">
<header><h1 id="h_163" class="notoc">Parameters</h1></header>
<table style="width:100%;">
<tr>
<th style="width:30%">Parameter</th>
<th>Description</th>
</tr>
<tr>
<td>0</td>
<td>The contents to escape.</td>
</tr>
</table>
</section>
</section>
<section class="section">
<header><h1 id="m_fragment" class="toc"><code>fragment</code></h1></header>
<p>Delimits a fragment of text that can be embedded using the <a href="#m_embed"><code>embed</code></a> macro.</p>
<strong>Aliases:</strong> <code>##</code>
<p><strong>Example:</strong> <code>##[test_fragment|This is an embeddable fragment]</code></p>
<section class="section">
<header><h1 id="h_165" class="notoc">Parameters</h1></header>
<table style="width:100%;">
<tr>
<th style="width:30%">Parameter</th>
<th>Description</th>
</tr>
<tr>
<td>0</td>
<td>The ID of the fragment.</td>
</tr>
<tr>
<td>1</td>
<td>The contents of the fragment.</td>
</tr>
</table>
</section>
</section>
<section class="section">
<header><h1 id="m_embed" class="toc"><code>embed</code></h1></header>
<p>Embeds text previously-delimited using the <a href="#m_fragment"><code>fragment</code></a> macro.</p>
<strong>Aliases:</strong> <code>&=</code>
<p><strong>Example:</strong> <code>&=[test_fragment]</code></p>
<section class="section">
<header><h1 id="h_167" class="notoc">Parameters</h1></header>
<table style="width:100%;">
<tr>
<th style="width:30%">Parameter</th>
<th>Description</th>
</tr>
<tr>
<td>0</td>
<td>The ID of the fragment.</td>
</tr>
</table>
</section>
</section>
<section class="section">
<header><h1 id="m_gt" class="toc"><code>gt</code></h1></header>
<p>Returns <em>true</em> if the first parameter is gt the second one.</p>
<p><strong>Example:</strong> <code>greater than[5|2]</code></p>
<section class="section">
<header><h1 id="h_169" class="notoc">Parameters</h1></header>
<table style="width:100%;">
<tr>
<th style="width:30%">Parameter</th>
<th>Description</th>
</tr>
<tr>
<td>0</td>
<td>The first integer to compare.</td>
</tr>
<tr>
<td>1</td>
<td>The second integer to compare.</td>
</tr>
</table>
</section>
</section>
<section class="section">
<header><h1 id="m_gte" class="toc"><code>gte</code></h1></header>
<p>Returns <em>true</em> if the first parameter is gte the second one.</p>
<p><strong>Example:</strong> <code>greater than or equal to[5|2]</code></p>
<section class="section">
<header><h1 id="h_171" class="notoc">Parameters</h1></header>
<table style="width:100%;">
<tr>
<th style="width:30%">Parameter</th>
<th>Description</th>
</tr>
<tr>
<td>0</td>
<td>The first integer to compare.</td>
</tr>
<tr>
<td>1</td>
<td>The second integer to compare.</td>
</tr>
</table>
</section>
</section>
<section class="section">
<header><h1 id="m_include" class="toc"><code>include</code></h1></header>
<p>Evaluates to the contents of a text file stored in the <code>text/</code> directory referenced by its relative path. If the <a href="/glyph/book/config/options.html#s_options_filters_by_file_extension"><code>options.filters_by_file_extension</code></a> setting is <code>true</code>, filters the contents of the file using the <a href="/glyph/book/macros/macros_filters.html#f_macros">filter macro</a> corresponding to the file extension.</p>
<strong>Aliases:</strong> <code>@</code>
<p><strong>Example:</strong> <code>include[frontmatter/introduction]</code></p>
<section class="section">
<header><h1 id="h_173" class="notoc">Parameters</h1></header>
<table style="width:100%;">
<tr>
<th style="width:30%">Parameter</th>
<th>Description</th>
</tr>
<tr>
<td>0</td>
<td>The file to include.</td>
</tr>
</table>
</section>
<section class="section">
<header><h1 id="h_174" class="notoc">Remarks</h1></header>
<ul>
<li>
<p>This macro cannot be used in <a href="/glyph/book/compiling/programmatic_usage.html#modes">safe mode</a>.</p>
</li>
<li><code>.glyph</code> is assumed if no file extension is specified.</li>
<li>
<p>This macro can also be used to include <code>.rb</code> ruby files within the <code>lib</code> directory. File contents are evaluated in the context of the <a href="http://rubydoc.info/gems/glyph/Glyph">Glyph</a> module.</p>
</li>
</ul>
</section>
</section>
<section class="section">
<header><h1 id="m_let" class="toc"><code>let</code></h1></header>
<p>Used to bind one or more attributes via the <a href="#m_attribute"><code>attribute</code></a> macro. Actually, you can use <a href="#m_attribute"><code>attribute</code></a> macro inside any other macro, but it looks tidier in this way.</p>
<section class="section">
<header><h1 id="h_176" class="notoc">Example</h1></header>
<div class="CodeRay">
<div class="code"><pre><span class="line-numbers"><a href="#n1" name="n1">1</a></span>let[
<span class="line-numbers"><a href="#n2" name="n2">2</a></span> @:[a|2]
<span class="line-numbers"><a href="#n3" name="n3">3</a></span> @:[b|3]
<span class="line-numbers"><a href="#n4" name="n4">4</a></span> section[
<span class="line-numbers"><a href="#n5" name="n5">5</a></span> @title[Testing]
<span class="line-numbers"><a href="#n6" name="n6">6</a></span> @[title]: @[a] * @[b] = multiply[@[a]|@[b]] --[Outputs: Testing: 2 * 3 = 6]
<span class="line-numbers"><a href="#n7" name="n7">7</a></span> ]
<span class="line-numbers"><a href="#n8" name="n8">8</a></span>]</pre></div>
</div>
</section>
<section class="section">
<header><h1 id="h_177" class="notoc">Parameters</h1></header>
<table style="width:100%;">
<tr>
<th style="width:30%">Parameter</th>
<th>Description</th>
</tr>
<tr>
<td>0</td>
<td>Any content.</td>
</tr>
</table>
</section>
</section>
<section class="section">
<header><h1 id="m_load" class="toc"><code>load</code></h1></header>
<p>Embeds the contents of a file.</p>
<p><strong>Example:</strong> <code>load[my_samples.rb]</code></p>
<section class="section">
<header><h1 id="h_179" class="notoc">Parameters</h1></header>
<table style="width:100%;">
<tr>
<th style="width:30%">Parameter</th>
<th>Description</th>
</tr>
<tr>
<td>0</td>
<td>The file to embed, relative to the Glyph project folder.</td>
</tr>
</table>
</section>
</section>
<section class="section">
<header><h1 id="m_lt" class="toc"><code>lt</code></h1></header>
<p>Returns <em>true</em> if the first parameter is lt the second one.</p>
<p><strong>Example:</strong> <code>less than[5|2]</code></p>
<section class="section">
<header><h1 id="h_181" class="notoc">Parameters</h1></header>
<table style="width:100%;">
<tr>
<th style="width:30%">Parameter</th>
<th>Description</th>
</tr>
<tr>
<td>0</td>
<td>The first integer to compare.</td>
</tr>
<tr>
<td>1</td>
<td>The second integer to compare.</td>
</tr>
</table>
</section>
</section>
<section class="section">
<header><h1 id="m_lte" class="toc"><code>lte</code></h1></header>
<p>Returns <em>true</em> if the first parameter is lte the second one.</p>
<p><strong>Example:</strong> <code>less than or equal to[5|2]</code></p>
<section class="section">
<header><h1 id="h_183" class="notoc">Parameters</h1></header>
<table style="width:100%;">
<tr>
<th style="width:30%">Parameter</th>
<th>Description</th>
</tr>
<tr>
<td>0</td>
<td>The first integer to compare.</td>
</tr>
<tr>
<td>1</td>
<td>The second integer to compare.</td>
</tr>
</table>
</section>
</section>
<section class="section">
<header><h1 id="m_match" class="toc"><code>match</code></h1></header>
<p>Checks a string against a regular expression.</p>
<p><strong>Example:</strong> <code>?[match[Hello!|/^hell/i]|This is always displayed]</code></p>
<section class="section">
<header><h1 id="h_185" class="notoc">Parameters</h1></header>
<table style="width:100%;">
<tr>
<th style="width:30%">Parameter</th>
<th>Description</th>
</tr>
<tr>
<td>0</td>
<td>The string to check.</td>
</tr>
<tr>
<td>1</td>
<td>The regular expression to match against the string.</td>
</tr>
<tr>
<td>2</td>
<td>The contents to expand if the string matches.</td>
</tr>
</table>
</section>
<section class="section">
<header><h1 id="h_186" class="notoc">Remarks</h1></header>
<p>This macro must be used with the <a href="#m_condition"><code>condition</code></a> macro.</p>
</section>
</section>
<section class="section">
<header><h1 id="m_macro_" class="toc"><code>macro:</code></h1></header>
<p>Defines a macro.</p>
<strong>Aliases:</strong> <code>%:</code>
<p><strong>Example:</strong> <code>%:[test|"<em>test: #{value}</em>"]</code></p>
<section class="section">
<header><h1 id="h_188" class="notoc">Parameters</h1></header>
<table style="width:100%;">
<tr>
<th style="width:30%">Parameter</th>
<th>Description</th>
</tr>
<tr>
<td>0</td>
<td>The name of the new macro.</td>
</tr>
<tr>
<td>1</td>
<td>The macro definition (Ruby code).</td>
</tr>
</table>
</section>
<section class="section">
<header><h1 id="h_189" class="notoc">Remarks</h1></header>
<ul>
<li>
<p>This macro cannot be used in <a href="/glyph/book/compiling/programmatic_usage.html#modes">safe mode</a>.</p>
</li>
<li>The new macro can only be used <em>after</em> its declaration.</li>
</ul>
</section>
</section>
<section class="section">
<header><h1 id="m_multiply" class="toc"><code>multiply</code></h1></header>
<p>Multiplies two or more integers together.</p>
<p><strong>Example:</strong> <code>add[3|5|9]</code></p>
</section>
<section class="section">
<header><h1 id="m_not" class="toc"><code>not</code></h1></header>
<p>Conditional <code>not</code> operator, to be used with the <a href="#m_condition"><code>condition</code></a> macro.</p>
<p><strong>Example:</strong> <code>?[not[false]|This is always displayed.]</code></p>
<section class="section">
<header><h1 id="h_192" class="notoc">Parameters</h1></header>
<table style="width:100%;">
<tr>
<th style="width:30%">Parameter</th>
<th>Description</th>
</tr>
<tr>
<td>0</td>
<td>The expression to negate</td>
</tr>
</table>
</section>
</section>
<section class="section">
<header><h1 id="m_output_" class="toc"><code>output?</code></h1></header>
<p>Evaluates to true if Glyph is generating output in the specified format(s).</p>
<p><strong>Example:</strong> <code>?[output?[web|web5]|This text is printed only when generating web or web5 output.]</code></p>
<section class="section">
<header><h1 id="h_194" class="notoc">Parameters</h1></header>
<table style="width:100%;">
<tr>
<th style="width:30%">Parameter</th>
<th>Description</th>
</tr>
<tr>
<td>0, ...</td>
<td>a valid output target.</td>
</tr>
</table>
</section>
</section>
<section class="section">
<header><h1 id="m_or" class="toc"><code>or</code></h1></header>
<p>Conditional <code>or</code> operator, to be used with the <a href="#m_condition"><code>condition</code></a> macro.</p>
<p><strong>Example:</strong> <code>?[or[true|false]|This is always displayed.]</code></p>
<section class="section">
<header><h1 id="h_196" class="notoc">Parameters</h1></header>
<table style="width:100%;">
<tr>
<th style="width:30%">Parameter</th>
<th>Description</th>
</tr>
<tr>
<td>0</td>
<td>The first expression to test</td>
</tr>
<tr>
<td>1</td>
<td>The second expression to test</td>
</tr>
</table>
</section>
</section>
<section class="section">
<header><h1 id="m_define_" class="toc"><code>define:</code></h1></header>
<p>Defines a new macro in Glyph code (for more information, see <a href="/glyph/book/extending/interpreting.html#rewriting">Defining macros using Glyph</a>)</p>
<strong>Aliases:</strong> <code>def:</code>
<section class="section">
<header><h1 id="h_198" class="notoc">Example</h1></header>
<div class="CodeRay">
<div class="code"><pre><span class="line-numbers"> <a href="#n1" name="n1">1</a></span>def:[factorial|
<span class="line-numbers"> <a href="#n2" name="n2">2</a></span> ?[
<span class="line-numbers"> <a href="#n3" name="n3">3</a></span> eq[{{0}}|0]|1|
<span class="line-numbers"> <a href="#n4" name="n4">4</a></span> multiply[
<span class="line-numbers"> <a href="#n5" name="n5">5</a></span> {{0}} | factorial[subtract[{{0}}|1]]
<span class="line-numbers"> <a href="#n6" name="n6">6</a></span> ]
<span class="line-numbers"> <a href="#n7" name="n7">7</a></span> ]
<span class="line-numbers"> <a href="#n8" name="n8">8</a></span>]
<span class="line-numbers"> <a href="#n9" name="n9">9</a></span>factorial[5]</pre></div>
</div>
</section>
<section class="section">
<header><h1 id="h_199" class="notoc">Parameters</h1></header>
<table style="width:100%;">
<tr>
<th style="width:30%">Parameter</th>
<th>Description</th>
</tr>
<tr>
<td>0</td>
<td>The name of the new macro.</td>
</tr>
<tr>
<td>0</td>
<td>The macro definition (Glyph code).</td>
</tr>
</table>
</section>
<section class="section">
<header><h1 id="h_200" class="notoc">Remarks</h1></header>
<ul>
<li>The new macro can only be used <em>after</em> its declaration.</li>
<li>
<p>This macro cannot be used in <a href="/glyph/book/compiling/programmatic_usage.html#modes">safe mode</a>.</p>
</li>
</ul>
</section>
</section>
<section class="section">
<header><h1 id="m_ruby" class="toc"><code>ruby</code></h1></header>
<p>Evaluates its value as Ruby code within the context of the <a href="http://rubydoc.info/gems/glyph/Glyph">Glyph</a> module.</p>
<strong>Aliases:</strong> <code>%</code>
<examples>
%[Time.now]
%[Glyph::VERSION]
</examples>
<section class="section">
<header><h1 id="h_202" class="notoc">Parameters</h1></header>
<table style="width:100%;">
<tr>
<th style="width:30%">Parameter</th>
<th>Description</th>
</tr>
<tr>
<td>0</td>
<td>The Ruby code to evaluate.</td>
</tr>
</table>
</section>
<section class="section">
<header><h1 id="h_203" class="notoc">Remarks</h1></header>
<p>This macro cannot be used in <a href="/glyph/book/compiling/programmatic_usage.html#modes">safe mode</a>.</p>
</section>
</section>
<section class="section">
<header><h1 id="m_s" class="toc"><code>s</code></h1></header>
<p>Can be used to dispatch almost any instance method of the ruby <a href="http://rubydoc.info/stdlib/core/1.9.2/String">String</a> class.</p>
<examples>
s/match[This is a test string|/test/]
s/sub[This is a test string|/a test/|another test]
</examples>
</section>
<section class="section">
<header><h1 id="m_snippet" class="toc"><code>snippet</code></h1></header>
<p>Returns the value of a snippet.</p>
<strong>Aliases:</strong> <code>&</code>
<p><strong>Example:</strong> <code>&[glang]</code></p>
<section class="section">
<header><h1 id="h_206" class="notoc">Parameters</h1></header>
<table style="width:100%;">
<tr>
<th style="width:30%">Parameter</th>
<th>Description</th>
</tr>
<tr>
<td>0</td>
<td>The ID of the snippet to retrieve.</td>
</tr>
</table>
</section>
</section>
<section class="section">
<header><h1 id="m_snippet_" class="toc"><code>snippet:</code></h1></header>
<p>Defines a snippet.</p>
<strong>Aliases:</strong> <code>&:</code>
<p><strong>Example:</strong> <code>&:[test|This is a test]</code></p>
<section class="section">
<header><h1 id="h_208" class="notoc">Parameters</h1></header>
<table style="width:100%;">
<tr>
<th style="width:30%">Parameter</th>
<th>Description</th>
</tr>
<tr>
<td>0</td>
<td>The ID of the new snippet.</td>
</tr>
<tr>
<td>1</td>
<td>The contents of the new snippet.</td>
</tr>
</table>
</section>
<section class="section">
<header><h1 id="h_209" class="notoc">Remarks</h1></header>
<p>The new snippet can only be used <em>after</em> its declaration.</p>
</section>
</section>
<section class="section">
<header><h1 id="m_subtract" class="toc"><code>subtract</code></h1></header>
<p>Subtracts two or more integers together.</p>
<p><strong>Example:</strong> <code>add[10|5|2]</code></p>
</section>
<section class="section">
<header><h1 id="m_xml" class="toc"><code>xml</code></h1></header>
<p>When used composed with another macro, it can be used to render arbitrary raw <span class="caps">XML</span> tags.</p>
<p><strong>Example:</strong> <code>xml/img[@src[test.png]@alt[A Test image]]</code></p>
</section>
<section class="section">
<header><h1 id="m_while" class="toc"><code>while</code></h1></header>
<p>Keeps evaluating the second parameter while a condition is satisfied.</p>
<section class="section">
<header><h1 id="h_213" class="notoc">Example</h1></header>
<div class="CodeRay">
<div class="code"><pre><span class="line-numbers"> <a href="#n1" name="n1">1</a></span>let[
<span class="line-numbers"> <a href="#n2" name="n2">2</a></span> @count[5]
<span class="line-numbers"> <a href="#n3" name="n3">3</a></span> @text[-]
<span class="line-numbers"> <a href="#n4" name="n4">4</a></span> while[gt[@[count]|0]|
<span class="line-numbers"> <a href="#n5" name="n5">5</a></span> @:[text|s/concat[@[text]|@[count]-]]
<span class="line-numbers"> <a href="#n6" name="n6">6</a></span> @:[count|subtract[@[count]|1]]
<span class="line-numbers"> <a href="#n7" name="n7">7</a></span> ]
<span class="line-numbers"> <a href="#n8" name="n8">8</a></span> @[text] --[Outputs: -5-4-3-2-1-]
<span class="line-numbers"> <a href="#n9" name="n9">9</a></span>]</pre></div>
</div>
</section>
<section class="section">
<header><h1 id="h_214" class="notoc">Parameters</h1></header>
<table style="width:100%;">
<tr>
<th style="width:30%">Parameter</th>
<th>Description</th>
</tr>
<tr>
<td>0</td>
<td>The condition to check.</td>
</tr>
<tr>
<td>1</td>
<td>The code to evaluate while the condition is satisfied.</td>
</tr>
</table>
</section>
</section>
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