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<title>Article Inflection</title>
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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="../index.html">home</a></li>
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</ul><h2>Compiler</h2><ul>
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<main role="main">
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<!--Weave of 'Article Inflection' 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">inflections</a></li><li><a href="index.html#2">Chapter 2: Simple Inflections</a></li><li><b>Article Inflection</b></li></ul></div>
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<p class="purpose">To inflect "a" into "an", and so forth.</p>
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. </b>Here we take text such as "UNESCO document" and put an article in front, to
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get "a UNESCO document" (and not "an UNESCO document": these things are much
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trickier than they look).
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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">match_avinue</span><span class="plain-syntax"> *</span><span class="identifier-syntax">indef_trie</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">ArticleInflection::preface_by_article</span><span class="plain-syntax">(</span><span class="identifier-syntax">OUTPUT_STREAM</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">initial_text</span><span class="plain-syntax">, </span><span class="identifier-syntax">NATURAL_LANGUAGE_WORDS_TYPE</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nl</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">indef_trie</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">)</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">indef_trie</span><span class="plain-syntax"> =</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">PreformUtilities::define_trie</span><span class="plain-syntax">(</span>
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<span class="plain-syntax"> </span><span class="function-syntax"><singular-noun-to-its-indefinite-article></span><span class="plain-syntax">, </span><span class="identifier-syntax">TRIE_START</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><a href="4-dl.html#SP1" class="function-link"><span class="function-syntax">DefaultLanguage::get</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">NULL</span><span class="plain-syntax">));</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">inchar32_t</span><span class="plain-syntax"> *</span><span class="identifier-syntax">result</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Tries::search_avinue</span><span class="plain-syntax">(</span><span class="identifier-syntax">indef_trie</span><span class="plain-syntax">, </span><span class="identifier-syntax">initial_text</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">result</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="identifier-syntax">result</span><span class="plain-syntax"> = </span><span class="identifier-syntax">U</span><span class="string-syntax">"a"</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">"%w %S"</span><span class="plain-syntax">, </span><span class="identifier-syntax">result</span><span class="plain-syntax">, </span><span class="identifier-syntax">initial_text</span><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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</pre>
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