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152 lines
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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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<html>
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<head>
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<title>What This Module Does</title>
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<link href="../docs-assets/Breadcrumbs.css" rel="stylesheet" rev="stylesheet" type="text/css">
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<meta name="viewport" content="width=device-width initial-scale=1">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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</head>
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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="../imperative-module/index.html">imperative</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.html"><span class="selectedlink">index</span></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">Inter Modules</a></li><li><a href="index.html">index</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 index 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. The Index</a></li><li><a href="P-wtmd.html#SP4">§4. Localisation</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 index 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. The Index. </b>All users of the Inform GUI app are familiar with the Index: it's a sort of
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mini-website giving a detailed picture of the content of the story being
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created. In the current design, there are seven colour-coded "pages", each
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divided up into two or more parts called "elements".
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</p>
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<p class="commentary">In fact, this is only one of the possible "index products". It's also possible
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to generate an EPS (encapsulated PostScript) file of a spatial map, for example.
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</p>
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<p class="commentary">Until 2021 the Index for a project was generated by the main <a href="../inform7/index.html" class="internal">inform7</a> compiler,
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but a radical refactoring then moved the entire <a href="index.html" class="internal">index</a> module into <a href="../inter/index.html" class="internal">inter</a>
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instead. Index products are now generated from trees of Inter code, not from
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Inform projects as such:
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="plain-syntax"> source text</span>
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<span class="plain-syntax"> |</span>
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<span class="plain-syntax"> | inform7</span>
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<span class="plain-syntax"> \|/</span>
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<span class="plain-syntax"> inter tree</span>
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<span class="plain-syntax"> / \</span>
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<span class="plain-syntax"> inter / \ inter</span>
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<span class="plain-syntax"> (final module) / \ (index module)</span>
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<span class="plain-syntax"> | |</span>
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<span class="plain-syntax"> \|/ \|/</span>
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<span class="plain-syntax"> generated code Index products</span>
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<span class="plain-syntax"> |</span>
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<span class="plain-syntax"> | inform6 (or similar)</span>
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<span class="plain-syntax"> \|/</span>
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<span class="plain-syntax"> Executable products</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP3" class="paragraph-anchor"></a><b>§3. </b>The <a href="index.html" class="internal">index</a> module has a very simple API: point it at a tree of Inter code,
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say what sort of index you want, and go. See <a href="1-ia.html" class="internal">Indexing API</a> for the details,
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though the details are not much more than that.
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</p>
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<p class="commentary firstcommentary"><a id="SP4" class="paragraph-anchor"></a><b>§4. Localisation. </b>A new and somewhat experimental addition in 2021 is the ability to localise the
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Index, that is, to produce an Index in a language other than English. This does
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not of course aim to translate source text: simply to translate subheadings, notes,
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and other fixed-wording text in the Index.
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</p>
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<p class="commentary">As a demonstration, try running a project with:
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="identifier-syntax">Use</span><span class="plain-syntax"> </span><span class="identifier-syntax">French</span><span class="plain-syntax"> </span><span class="identifier-syntax">language</span><span class="plain-syntax"> </span><span class="identifier-syntax">index</span><span class="plain-syntax">.</span>
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</pre>
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<p class="commentary">You should then find that the index has a French-titled Contents section — only
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a couple of strings have been localised at present, and those not localised
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revert to English, so the index still looks basically English. This is all really
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just laying groundwork.
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</p>
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<p class="commentary">For how to write localisation files, see <a href="../html-module/2-lcl.html" class="internal">Localisation (in html)</a>, or follow
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the example of <span class="extract"><span class="extract-syntax">inform/inform7/Internal/Languages/English/Index.txt</span></span>.
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</p>
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