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content/glyph/book/text_editing/evaluation.html

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<?xml version="1.0" encoding="utf-8"?>
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<title>Evaluating Ruby code and Configuration Settings - Glyph</title>
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						<h2>Evaluating Ruby code and Configuration Settings</h2>
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							<div class="navigation"><a href="/glyph/book/text_editing/inclusions.html">Including Files and Snippets &larr;</a><a href="/glyph/book/index.html">Contents</a><a href="/glyph/book/text_editing/conditionals.html">&rarr; Conditional Macros</a></div>
								<p>Glyph Language is not a full-blown programming language and it is currently not Turing-complete (it does not provide loops). However, it is possible to evaluate simple ruby code snippets using the <code>ruby</code> macro (aliased to <code>%</code>), like this:</p>
<ul>
	<li><code>%[2 + 2]</code> &rarr; 4</li>
	<li><code>%[Time.now]</code> &rarr; Fri Sep 03 17:23:01 +0200 2010</li>
	<li><code>%[Glyph::VERSION]</code> &rarr; 0.4.0</li>
</ul>
<p>The scope for the code evaluation is the Kernel module, (with all inclusions required by Glyph itself).</p>
<p>Although it is possible to retrieve Glyph configuration settings in this way (e.g. <code>%[cfg('document.author')]</code>), the <a href="/glyph/book/macros/macros_core.html#m_config"><code>config</code></a> macro (aliased to <code>$</code>) makes things slightly simpler (e.g. <code>$[document.author]</code>).</p>
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