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<title>Problems Module</title>
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<li><a href="index.html"><span class="selectedlink">problems</span></a></li>
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<main role="main">
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<!--Weave of 'Problems 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="../compiler.html">Services</a></li><li><a href="index.html">problems</a></li><li><a href="index.html#1">Chapter 1: Starting Up</a></li><li><b>Problems Module</b></li></ul></div>
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<p class="purpose">Setting up the use of this module.</p>
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. </b>This section simoly sets up the module in ways expected by <a href="../../../inweb/docs/foundation-module/index.html" class="internal">foundation</a>, and
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contains no code of interest. The following constant exists only in tools
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which use this module:
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</p>
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<pre class="definitions code-font"><span class="definition-keyword">define</span> <span class="constant-syntax">PROBLEMS_MODULE</span><span class="plain-syntax"> </span><span class="identifier-syntax">TRUE</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>§2. </b>Note that this module uses its fellow services module <a href="../syntax-module/index.html" class="internal">syntax</a>, and adds
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the following annotation to the syntax tree:
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</p>
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<pre class="definitions code-font"><span class="definition-keyword">enum</span> <span class="constant-syntax">problem_falls_under_ANNOT</span><span class="plain-syntax"> </span><span class="comment-syntax"> </span><span class="extract"><span class="extract-syntax">parse_node</span></span><span class="comment-syntax">: what heading the sentence falls under</span>
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</pre>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="identifier-syntax">DECLARE_ANNOTATION_FUNCTIONS</span><span class="plain-syntax">(</span><span class="identifier-syntax">problem_falls_under</span><span class="plain-syntax">, </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax">)</span>
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<span class="identifier-syntax">MAKE_ANNOTATION_FUNCTIONS</span><span class="plain-syntax">(</span><span class="identifier-syntax">problem_falls_under</span><span class="plain-syntax">, </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax">)</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP3" class="paragraph-anchor"></a><b>§3. </b>Like all modules, this one must define a <span class="extract"><span class="extract-syntax">start</span></span> and <span class="extract"><span class="extract-syntax">end</span></span> function.
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">ProblemsModule::start</span><span class="plain-syntax">(</span><span class="reserved-syntax">void</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Annotations::allow_for_category</span><span class="plain-syntax">(</span><span class="identifier-syntax">L2_NCAT</span><span class="plain-syntax">, </span><span class="constant-syntax">problem_falls_under_ANNOT</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Annotations::declare_type</span><span class="plain-syntax">(</span><span class="constant-syntax">problem_falls_under_ANNOT</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><a href="1-pm.html#SP3" class="function-link"><span class="function-syntax">ProblemsModule::write_problem_falls_under_ANNOT</span></a><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">ProblemsModule::end</span><span class="plain-syntax">(</span><span class="reserved-syntax">void</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">ProblemsModule::write_problem_falls_under_ANNOT</span><span class="plain-syntax">(</span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">p</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Node::get_problem_falls_under</span><span class="plain-syntax">(</span><span class="identifier-syntax">p</span><span class="plain-syntax">))</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"{under: '%W'}"</span><span class="plain-syntax">, </span><span class="identifier-syntax">Node::get_text</span><span class="plain-syntax">(</span><span class="identifier-syntax">Node::get_problem_falls_under</span><span class="plain-syntax">(</span><span class="identifier-syntax">p</span><span class="plain-syntax">)));</span>
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<span class="plain-syntax">}</span>
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</pre>
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