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<title>What This Module Does</title>
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<body class="commentary-font">
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<nav role="navigation">
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<h1><a href="../index.html">
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<img src="../docs-assets/Inform.png" height=72">
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</a></h1>
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<ul><li><a href="../compiler.html">compiler tools</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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</ul><h2>Compiler Webs</h2><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><h2>Inbuild Modules</h2><ul>
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<li><a href="../supervisor-module/index.html">supervisor</a></li>
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</ul><h2>Inform7 Modules</h2><ul>
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<li><a href="../core-module/index.html">core</a></li>
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<li><a href="../assertions-module/index.html">assertions</a></li>
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<li><a href="../values-module/index.html">values</a></li>
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<li><a href="../knowledge-module/index.html">knowledge</a></li>
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<li><a href="index.html"><span class="selectedlink">imperative</span></a></li>
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<li><a href="../runtime-module/index.html">runtime</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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</ul><h2>Inter Modules</h2><ul>
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<li><a href="../bytecode-module/index.html">bytecode</a></li>
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<li><a href="../building-module/index.html">building</a></li>
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<li><a href="../pipeline-module/index.html">pipeline</a></li>
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<li><a href="../final-module/index.html">final</a></li>
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</ul><h2>Services</h2><ul>
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<li><a href="../arch-module/index.html">arch</a></li>
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<li><a href="../calculus-module/index.html">calculus</a></li>
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<li><a href="../html-module/index.html">html</a></li>
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<li><a href="../inflections-module/index.html">inflections</a></li>
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<li><a href="../kinds-module/index.html">kinds</a></li>
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<li><a href="../linguistics-module/index.html">linguistics</a></li>
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<li><a href="../problems-module/index.html">problems</a></li>
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<li><a href="../syntax-module/index.html">syntax</a></li>
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<li><a href="../words-module/index.html">words</a></li>
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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 'What This Module Does' generated by Inweb-->
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<div class="breadcrumbs">
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<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../compiler.html">Inform7</a></li><li><a href="index.html">imperative</a></li><li><a href="index.html#P">Preliminaries</a></li><li><b>What This Module Does</b></li></ul></div>
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<p class="purpose">An overview of the imperative module's role and abilities.</p>
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<ul class="toc"><li><a href="P-wtmd.html#SP1">§1. Prerequisites</a></li><li><a href="P-wtmd.html#SP2">§2. About this layer of Inform</a></li></ul><hr class="tocbar">
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. Prerequisites. </b>The imperative module is a part of the Inform compiler toolset. It is
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presented as a literate program or "web". Before diving in:
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</p>
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<ul class="items"><li>(a) It helps to have some experience of reading webs: see <a href="../../../inweb/docs/index.html" class="internal">inweb</a> for more.
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</li><li>(b) The module is written in C, in fact ANSI C99, but this is disguised by the
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fact that it uses some extension syntaxes provided by the <a href="../../../inweb/docs/index.html" class="internal">inweb</a> literate
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programming tool, making it a dialect of C called InC. See <a href="../../../inweb/docs/index.html" class="internal">inweb</a> for
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full details, but essentially: it's C without predeclarations or header files,
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and where functions have names like <span class="extract"><span class="extract-syntax">Tags::add_by_name</span></span> rather than just <span class="extract"><span class="extract-syntax">add_by_name</span></span>.
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</li><li>(c) This module uses other modules drawn from the <a href="../compiler.html" class="internal">compiler</a>, and also
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uses a module of utility functions called <a href="../../../inweb/docs/foundation-module/index.html" class="internal">foundation</a>.
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For more, see <a href="../../../inweb/docs/foundation-module/P-abgtf.html" class="internal">A Brief Guide to Foundation (in foundation)</a>.
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</li></ul>
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<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>§2. About this layer of Inform. </b>The <a href="../runtime-module/index.html" class="internal">runtime</a> and <a href="index.html" class="internal">imperative</a> modules (see <a href="P-wtmd.html" class="internal">What This Module Does (in imperative)</a>)
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jointly make up a layer of Inform whose task is to take the conceptual structures
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now build up — rules, phrases, tables, the world model — and turn them into
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Inter code. For the bigger picture, see <a href="../compiler.html" class="internal">compiler</a>.
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</p>
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<p class="commentary">Neither module is in charge of the other. <a href="../runtime-module/index.html" class="internal">runtime</a> makes extensive use of
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<a href="3-fnc.html" class="internal">Functions (in imperative)</a>, while <a href="index.html" class="internal">imperative</a> uses <a href="../runtime-module/2-emt.html" class="internal">Emit (in runtime)</a> and
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<a href="../runtime-module/2-hrr.html" class="internal">Hierarchy (in runtime)</a>. The demarcation line is that:
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</p>
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<ul class="items"><li>● <a href="index.html" class="internal">imperative</a> provides general mechanisms for compiling Inter functions,
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and uses them to construct the functions needed for rules and phrases.
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</li><li>● <a href="../runtime-module/index.html" class="internal">runtime</a> organises the hierarchical structure of the Inter code being
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made, and compiles the Inter representations of data structures like rulebooks
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or tables, and any Inter functions needed to manage them at runtime.
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</li></ul>
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<ul class="progressbar"><li class="progressprevoff">❮</li><li class="progresscurrentchapter">P</li><li class="progresscurrent">wtmd</li><li class="progresschapter"><a href="1-im.html">1</a></li><li class="progresschapter"><a href="2-cv.html">2</a></li><li class="progresschapter"><a href="3-sf.html">3</a></li><li class="progresschapter"><a href="4-cs.html">4</a></li><li class="progresschapter"><a href="5-cbal.html">5</a></li><li class="progressnext"><a href="1-im.html">❯</a></li></ul></div>
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