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<title>How To Include This Module</title>
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<h1><a href="../index.html">
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<ul><li><a href="../index.html">home</a></li>
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<li><a href="https://github.com/ganelson/inform"><img src="../docs-assets/github.png" height=18> github</a></li>
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<!--Weave of 'How To Include This Module' 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="../services.html">Services</a></li><li><a href="index.html">words</a></li><li><a href="index.html#P">Preliminaries</a></li><li><b>How To Include This Module</b></li></ul></div>
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<p class="purpose">What to do to make use of the words module in a new command-line tool.</p>
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<ul class="toc"><li><a href="P-htitm.html#SP1">§1. Status</a></li><li><a href="P-htitm.html#SP2">§2. Importing the module</a></li><li><a href="P-htitm.html#SP3">§3. Using callbacks</a></li></ul><hr class="tocbar">
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. Status. </b>The words module provided as one of the "services" suite of modules, which means
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that it was built with a view to potential incorporation in multiple tools.
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It can be found, for example, in <a href="../inform7/index.html" class="internal">inform7</a>, <a href="../inbuild/index.html" class="internal">inbuild</a> and <a href="../words-test/index.html" class="internal">words-test</a>,
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among others. <a href="../words-test/index.html" class="internal">words-test</a> may be useful as a minimal example of a tool
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using <a href="index.html" class="internal">words</a>.
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</p>
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<p class="commentary">By convention, the modules considered as "services" have no dependencies on
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other modules except for <a href="../../../inweb/docs/foundation-module/index.html" class="internal">foundation</a> and other "services" modules.
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</p>
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<p class="commentary">A tool can import <a href="index.html" class="internal">words</a> only if it also imports <a href="../../../inweb/docs/foundation-module/index.html" class="internal">foundation</a>.
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</p>
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<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>§2. Importing the module. </b>We'll use the term "parent" to mean the tool which is importing <a href="index.html" class="internal">words</a>,
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that is, which will include its code and be able to use it. As with any
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imported module,
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</p>
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<ul class="items"><li>● The contents page of the parent's web must identify and locate the
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module:
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</li></ul>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="element-syntax">Import</span><span class="plain-syntax">:</span><span class="string-syntax"> somepath/words</span>
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</pre>
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<ul class="items"><li>● The parent must call <span class="extract"><span class="extract-syntax">WordsModule::start()</span></span> just after it starts up, and
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<span class="extract"><span class="extract-syntax">WordsModule::end()</span></span> just before it shuts down. (But just after, and just
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before, the corresponding calls to <a href="../../../inweb/docs/foundation-module/index.html" class="internal">foundation</a>.)
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</li></ul>
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<p class="commentary firstcommentary"><a id="SP3" class="paragraph-anchor"></a><b>§3. Using callbacks. </b>Shared modules like this one are tweaked in behaviour by defining "callback
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functions". This means that the parent might provide a function of its own
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which would answer a question put to it by the module, or take some action
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on behalf of the module: it's a callback in the sense that the parent is
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normally calling the module, but then the module calls the parent back to
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ask for data or action.
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</p>
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<p class="commentary">The parent must indicate which function to use by defining a constant with
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a specific name as being equal to that function's name. A fictional example
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would be
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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"> </span><span class="function-syntax">@d</span><span class="plain-syntax"> EXPRESS_SURPRISE_WORDS_CALLBACK Emotions::wow</span>
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<span class="plain-syntax"> =</span>
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<span class="plain-syntax"> </span><span class="element-syntax">void Emotions:</span><span class="plain-syntax">:</span><span class="string-syntax">wow(text_stream *OUT) {</span>
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<span class="plain-syntax"> WRITE("My word!\n");</span>
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<span class="plain-syntax"> }</span>
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</pre>
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<p class="commentary">The words module has only a few callbacks, and they are all optional. The
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following alphabetical list has references to fuller explanations:
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</p>
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<ul class="items"><li>● <span class="extract"><span class="extract-syntax">MORE_PREFORM_OPTIMISER_WORDS_CALLBACK</span></span> and <span class="extract"><span class="extract-syntax">PREFORM_OPTIMISER_WORDS_CALLBACK</span></span>
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have the opportunity to flag certain Preform nonterminals in ways which will
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help <a href="4-to.html" class="internal">The Optimiser</a>.
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</li><li>● <span class="extract"><span class="extract-syntax">PREFORM_ERROR_WORDS_CALLBACK</span></span> allows the parent to issue errors about
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Preform definitions in its own way; they will otherwise by default be standard
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command-line error message written to <span class="extract"><span class="extract-syntax">STDERR</span></span>.
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</li><li>● <span class="extract"><span class="extract-syntax">PROBLEM_WORDS_CALLBACK</span></span> is called when a lexical error is found, and can
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prevent this from being issued to the terminal as an error message: see
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<a href="3-lxr.html#SP30" class="internal">Lexer::lexer_problem_handler</a>.
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</li><li>● <span class="extract"><span class="extract-syntax">VOCABULARY_MEANING_INITIALISER_WORDS_CALLBACK</span></span> is called to attach a
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meaning object to a single <a href="2-vcb.html#SP1" class="internal">vocabulary_entry</a>. In this module, meanings are
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not our concern: all we provide is the opportunity for our parent tool to
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attach such meanings to words. See <a href="2-vcb.html#SP5" class="internal">Vocabulary::vocab_entry_new</a>.
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</li></ul>
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<p class="commentary firstcommentary"><a id="SP4" class="paragraph-anchor"></a><b>§4. </b>If the selection of a natural language is a meaningful thing to the parent,
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it can define <span class="extract"><span class="extract-syntax">NATURAL_LANGUAGE_WORDS_TYPE</span></span> to tell the Preform parser how
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to refer to these. For example, the <a href="../supervisor-module/index.html" class="internal">supervisor</a> module has:
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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"> </span><span class="function-syntax">@d</span><span class="plain-syntax"> NATURAL_LANGUAGE_WORDS_TYPE struct inform_language</span>
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</pre>
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