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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<title>6/cs</title>
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<nav role="navigation">
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<h1><a href="../webs.html">Sources</a></h1>
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<ul>
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<li><a href="../compiler.html"><b>compiler</b></a></li>
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<li><a href="../other.html">other tools</a></li>
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<li><a href="../extensions.html">extensions and kits</a></li>
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<li><a href="../units.html">unit test tools</a></li>
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<h2>Compiler Webs</h2>
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<ul>
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<li><a href="../inbuild/index.html">inbuild</a></li>
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<li><a href="../inform7/index.html">inform7</a></li>
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<li><a href="../inter/index.html">inter</a></li>
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</ul>
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<h2>Inbuild Modules</h2>
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<ul>
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<li><a href="../inbuild-module/index.html">inbuild</a></li>
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<li><a href="../arch-module/index.html">arch</a></li>
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<li><a href="../words-module/index.html">words</a></li>
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<li><a href="../syntax-module/index.html">syntax</a></li>
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<li><a href="../html-module/index.html">html</a></li>
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<h2>Inform7 Modules</h2>
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<ul>
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<li><a href="../core-module/index.html">core</a></li>
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<li><a href="../problems-module/index.html">problems</a></li>
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<li><a href="../inflections-module/index.html">inflections</a></li>
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<li><a href="../linguistics-module/index.html">linguistics</a></li>
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<li><a href="../kinds-module/index.html">kinds</a></li>
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<li><a href="../if-module/index.html">if</a></li>
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<li><a href="../multimedia-module/index.html">multimedia</a></li>
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<li><a href="../index-module/index.html">index</a></li>
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<h2>Inter Modules</h2>
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<ul>
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<li><a href="../inter-module/index.html">inter</a></li>
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<li><a href="../building-module/index.html">building</a></li>
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<li><a href="../codegen-module/index.html">codegen</a></li>
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</ul>
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<h2>Foundation</h2>
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<ul>
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<li><a href="../../../inweb/docs/foundation-module/index.html">foundation</a></li>
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</ul>
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</nav>
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<main role="main">
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<!--Weave of '6/vmg' generated by 7-->
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<ul class="crumbs"><li><a href="../webs.html">Source</a></li><li><a href="../compiler.html">Compiler Modules</a></li><li><a href="index.html">inbuild</a></li><li><a href="index.html#6">Chapter 6: Handling Inform Source Text</a></li><li><b>Virtual Machine Grammar</b></li></ul><p class="purpose">Grammar for parsing natural language descriptions of a virtual machine.</p>
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<p class="inwebparagraph"><a id="SP1"></a><b>§1. </b>This nonterminal corresponds to the Inbuild version number syntax in the
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arch module: for example, it matches <code class="display"><span class="extract">2.7.6</span></code> or <code class="display"><span class="extract">3/990505</span></code>.
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</p>
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<pre class="display">
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<span class="plain"><</span><span class="identifier">version</span><span class="plain">-</span><span class="identifier">number</span><span class="plain">> </span><span class="identifier">internal</span><span class="plain"> 1 {</span>
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<span class="identifier">TEMPORARY_TEXT</span><span class="plain">(</span><span class="identifier">vtext</span><span class="plain">);</span>
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<span class="identifier">WRITE_TO</span><span class="plain">(</span><span class="identifier">vtext</span><span class="plain">, </span><span class="string">"%W"</span><span class="plain">, </span><span class="identifier">W</span><span class="plain">);</span>
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<span class="identifier">semantic_version_number</span><span class="plain"> </span><span class="identifier">V</span><span class="plain"> = </span><span class="identifier">VersionNumbers::from_text</span><span class="plain">(</span><span class="identifier">vtext</span><span class="plain">);</span>
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<span class="reserved">int</span><span class="plain"> </span><span class="identifier">result</span><span class="plain"> = </span><span class="identifier">FALSE</span><span class="plain">;</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">VersionNumbers::is_null</span><span class="plain">(</span><span class="identifier">V</span><span class="plain">) == </span><span class="identifier">FALSE</span><span class="plain">) {</span>
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<span class="identifier">result</span><span class="plain"> = </span><span class="identifier">TRUE</span><span class="plain">;</span>
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<span class="identifier">semantic_version_number_holder</span><span class="plain"> *</span><span class="identifier">H</span><span class="plain"> = </span><span class="identifier">CREATE</span><span class="plain">(</span><span class="identifier">semantic_version_number_holder</span><span class="plain">);</span>
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<span class="identifier">H</span><span class="plain">-</span><span class="element">>version</span><span class="plain"> = </span><span class="identifier">V</span><span class="plain">;</span>
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<span class="plain">*</span><span class="identifier">XP</span><span class="plain"> = (</span><span class="reserved">void</span><span class="plain"> *) </span><span class="identifier">H</span><span class="plain">;</span>
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<span class="plain">}</span>
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<span class="identifier">DISCARD_TEXT</span><span class="plain">(</span><span class="identifier">vtext</span><span class="plain">);</span>
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<span class="reserved">return</span><span class="plain"> </span><span class="identifier">result</span><span class="plain">;</span>
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<span class="plain">}</span>
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</pre>
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<p class="inwebparagraph"></p>
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<p class="inwebparagraph"><a id="SP2"></a><b>§2. </b>The following nonterminal matches any valid description of a virtual machine,
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with result <code class="display"><span class="extract">TRUE</span></code> if the current target VM matches that description and
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<code class="display"><span class="extract">FALSE</span></code> if not.
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</p>
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<pre class="display">
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<span class="plain"><</span><span class="identifier">virtual</span><span class="plain">-</span><span class="identifier">machine</span><span class="plain">> </span><span class="identifier">internal</span><span class="plain"> {</span>
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<span class="identifier">TEMPORARY_TEXT</span><span class="plain">(</span><span class="identifier">vtext</span><span class="plain">);</span>
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<span class="identifier">WRITE_TO</span><span class="plain">(</span><span class="identifier">vtext</span><span class="plain">, </span><span class="string">"%W"</span><span class="plain">, </span><span class="identifier">W</span><span class="plain">);</span>
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<span class="identifier">compatibility_specification</span><span class="plain"> *</span><span class="identifier">C</span><span class="plain"> = </span><span class="identifier">Compatibility::from_text</span><span class="plain">(</span><span class="identifier">vtext</span><span class="plain">);</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">C</span><span class="plain">) { *</span><span class="identifier">XP</span><span class="plain"> = </span><span class="identifier">C</span><span class="plain">; </span><span class="reserved">return</span><span class="plain"> </span><span class="identifier">TRUE</span><span class="plain">; }</span>
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<span class="plain">*</span><span class="identifier">XP</span><span class="plain"> = </span><span class="identifier">NULL</span><span class="plain">; </span><span class="reserved">return</span><span class="plain"> </span><span class="identifier">FALSE</span><span class="plain">;</span>
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<span class="plain">}</span>
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</pre>
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<p class="inwebparagraph"></p>
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<hr class="tocbar">
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<ul class="toc"><li><a href="6-cs.html">Back to 'Control Structures'</a></li><li><i>(This section ends Chapter 6: Handling Inform Source Text.)</i></li></ul><hr class="tocbar">
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