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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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<!--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">kinds</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 kinds 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 kinds module is provided as one of the "services" suite of modules,
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which means that it was built with a view to potential incorporation in
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multiple tools. It can be found, for example, in <a href="../inform7/index.html" class="internal">inform7</a> and
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<a href="../kinds-test/index.html" class="internal">kinds-test</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/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">kinds</a> only if it also imports <a href="../../../inweb/foundation-module/index.html" class="internal">foundation</a>,
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<a href="../words-module/index.html" class="internal">words</a>, <a href="../syntax-module/index.html" class="internal">syntax</a>, <a href="../inflections-module/index.html" class="internal">inflections</a> and <a href="../linguistics-module/index.html" class="internal">linguistics</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">kinds</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/kinds</span>
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</pre>
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<ul class="items"><li>● The parent must call <a href="1-km.html#SP3" class="internal">KindsModule::start</a> just after it starts up, and
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<a href="1-km.html#SP3" class="internal">KindsModule::end</a> just before it shuts down. (But just after, and just
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before, the corresponding calls to <a href="../../../inweb/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_KINDS_CALLBACK Emotions::whoa</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">whoa(text_stream *OUT) {</span>
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<span class="plain-syntax"> WRITE("Great heavens!\n");</span>
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<span class="plain-syntax"> }</span>
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</pre>
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<p class="commentary">The 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">DETERMINE_SCALE_FACTOR_KINDS_CALLBACK</span></span>, if provided, is called to give
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the "scale factor" for a kind. See <a href="../values-module/3-lp.html" class="internal">Literal Patterns (in values)</a> for the
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use of this; here, it appears in <a href="2-uk.html#SP17" class="internal">Kinds::Behaviour::scale_factor</a>.
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</li><li>● <span class="extract"><span class="extract-syntax">HIERARCHY_GET_SUPER_KINDS_CALLBACK</span></span> is called to ask what the superkind
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of a kind is. See <a href="2-tlok.html#SP6" class="internal">Latticework::super</a>.
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</li><li>● <span class="extract"><span class="extract-syntax">HIERARCHY_ALLOWS_SOMETIMES_MATCH_KINDS_CALLBACK</span></span> is called to ask if q
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kind can contain sometimes-matching subkind instances. See
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<a href="2-tlok.html#SP13" class="internal">Latticework::order_relation</a>.
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</li><li>● <span class="extract"><span class="extract-syntax">HIERARCHY_MOVE_KINDS_CALLBACK</span></span> is called to ask us to put make one
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kind a subkind of another. See <a href="2-knd.html#SP21" class="internal">Kinds::make_subkind</a> and
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<a href="2-knd.html#SP20" class="internal">Kinds::new_base</a> — there are two ways this can happen.
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</li><li>● <span class="extract"><span class="extract-syntax">HIERARCHY_VETO_MOVE_KINDS_CALLBACK</span></span> is called to give the parent tool a
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chance to veto any proposed subkind. (Inform uses this, for example, to catch
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the case of somebody making "region" a subkind of some other kind of object.)
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See <a href="2-knd.html#SP21" class="internal">Kinds::make_subkind</a>.
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</li><li>● <span class="extract"><span class="extract-syntax">NEW_BASE_KINDS_CALLBACK</span></span> is called when a new base kind (properly
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speaking, a new arity-0 kind constructor) is made. See <a href="2-knd.html#SP20" class="internal">Kinds::new_base</a>
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and <a href="4-nf.html#SP1" class="internal">NeptuneFiles::read_command</a> — there are two ways this can happen.
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</li><li>● <span class="extract"><span class="extract-syntax">NOTIFY_NATURAL_LANGUAGE_KINDS_CALLBACK</span></span> is called when the kind "natural
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language" is created (if it is): see <a href="2-fk.html#SP13" class="internal">FamiliarKinds::notice_new_kind</a>.
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</li><li>● <span class="extract"><span class="extract-syntax">PROBLEM_KINDS_CALLBACK</span></span> is called when a syntax 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="1-km.html#SP5" class="internal">KindsModule::problem_handler</a>.
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</li><li>● <span class="extract"><span class="extract-syntax">REGISTER_NOUN_KINDS_CALLBACK</span></span>, if provided, can register a common noun
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for a new base kind with the lexicon itself. See <a href="2-knd.html#SP20" class="internal">Kinds::new_base</a>.
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</li></ul>
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