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<!--Weave of 'Lexicon' 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">lexicon</a></li><li><a href="index.html#1">Chapter 1: Setting Up</a></li><li><b>Lexicon</b></li></ul></div>
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<p class="purpose">This section provides a simple API for storing and retrieving lexicon entries.</p>
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. </b>The user creates new lexicon entries 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="reserved-syntax">excerpt_meaning</span><span class="plain-syntax"> *</span><span class="function-syntax">Lexicon::register</span><span class="plain-syntax">(</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">unsigned</span><span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">meaning_code</span><span class="plain-syntax">, </span><span class="identifier-syntax">wording</span><span class="plain-syntax"> </span><span class="identifier-syntax">W</span><span class="plain-syntax">, </span><span class="identifier-syntax">general_pointer</span><span class="plain-syntax"> </span><span class="identifier-syntax">data</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">Wordings::empty</span><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">)) </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"tried to register empty excerpt meaning"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="2-em.html#SP12" class="function-link"><span class="function-syntax">ExcerptMeanings::register</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">meaning_code</span><span class="plain-syntax">, </span><span class="identifier-syntax">W</span><span class="plain-syntax">, </span><span class="identifier-syntax">data</span><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>§2. </b><a href="2-em.html#SP1" class="internal">excerpt_meaning</a> objects are intended to be fairly opaque, but the user
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can call this to extract their attached data:
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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">general_pointer</span><span class="plain-syntax"> </span><span class="function-syntax">Lexicon::get_data</span><button class="popup" onclick="togglePopup('usagePopup1')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup1">Usage of <span class="code-font"><span class="function-syntax">Lexicon::get_data</span></span>:<br/>Parse Excerpts - <a href="2-pe.html#SP7">§7</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">excerpt_meaning</span><span class="plain-syntax"> *</span><span class="identifier-syntax">em</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">em</span><span class="plain-syntax">-></span><span class="element-syntax">data</span><span class="plain-syntax">;</span>
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<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>Entries can be retrieved either the regular way, or in "maximal mode",
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which tries to parse a maximal-length initial portion of <span class="extract"><span class="extract-syntax">W</span></span> rather than
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necessarily the whole thing. For example, that mode might peel off the
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adjective "fixed in place" from wording <span class="extract"><span class="extract-syntax">W</span></span> which was "fixed in place door".
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This is very much the exception: we almost always want to match the whole of <span class="extract"><span class="extract-syntax">W</span></span>.
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</p>
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<p class="commentary">It might seem symmetrical that the return value should be an <a href="2-em.html#SP1" class="internal">excerpt_meaning</a>.
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But that wouldn't enable us to return multiple results in the (frequent) case
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of ambiguity. Instead, we need to return a list of possibilities, and we do
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that by returning fragment of syntax tree material, using the infrastructure
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from <a href="../syntax-module/index.html" class="internal">syntax</a>. This will be a list of nodes joined by <span class="extract"><span class="extract-syntax">->next_alternative</span></span> limks.
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</p>
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<p class="commentary">This list of nodes is disposable — even if it is a copy of something from the
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syntax tree, it is never the only copy. It can freely be ignored or changed.
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A return value of <span class="extract"><span class="extract-syntax">NULL</span></span> means there were no results at all.
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</p>
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<ul class="items"><li>● If a meaning was registered in such a way that its <span class="extract"><span class="extract-syntax">data</span></span> actually was a
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node from the syntax tree, then the result is a copy of that node.
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</li><li>● If not then the result is a node with the meaning code as its node type,
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and the excerpt meaning can be recovered from it using <span class="extract"><span class="extract-syntax">Node::get_meaning</span></span>.
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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="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="function-syntax">Lexicon::retrieve</span><span class="plain-syntax">(</span><span class="reserved-syntax">unsigned</span><span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">mc_bitmap</span><span class="plain-syntax">, </span><span class="identifier-syntax">wording</span><span class="plain-syntax"> </span><span class="identifier-syntax">W</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="2-pe.html#SP5" class="function-link"><span class="function-syntax">FromLexicon::parse</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">mc_bitmap</span><span class="plain-syntax">, </span><span class="identifier-syntax">W</span><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">lexicon_in_maximal_mode</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
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<span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="function-syntax">Lexicon::retrieve_longest_initial_segment</span><span class="plain-syntax">(</span><span class="reserved-syntax">unsigned</span><span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">mc_bitmap</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">wording</span><span class="plain-syntax"> </span><span class="identifier-syntax">W</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">s</span><span class="plain-syntax"> = </span><span class="identifier-syntax">lexicon_in_maximal_mode</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">lexicon_in_maximal_mode</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
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<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><a href="2-pe.html#SP5" class="function-link"><span class="function-syntax">FromLexicon::parse</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">mc_bitmap</span><span class="plain-syntax">, </span><span class="identifier-syntax">W</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">lexicon_in_maximal_mode</span><span class="plain-syntax"> = </span><span class="identifier-syntax">s</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</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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<p class="commentary firstcommentary"><a id="SP4" class="paragraph-anchor"></a><b>§4. </b>As a bonus, since the lexicon uses quite a convenient hash-coding system
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for excerpts, the following is available for anyone wanting to take advantage:
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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">int</span><span class="plain-syntax"> </span><span class="function-syntax">Lexicon::wording_hash</span><span class="plain-syntax">(</span><span class="identifier-syntax">wording</span><span class="plain-syntax"> </span><span class="identifier-syntax">W</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="2-em.html#SP8" class="function-link"><span class="function-syntax">ExcerptMeanings::hash_code</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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