106 lines
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<title>Paragraph Macros</title>
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<h1><a href="../index.html">
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<img src="../docs-assets/Octagram.png" width=72 height=72">
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</a></h1>
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<ul><li><a href="index.html"><span class="selectedlink">inweb</span></a></li>
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</ul><h2>Foundation Module</h2><ul>
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<li><a href="../foundation-module/index.html">foundation</a></li>
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<li><a href="../foundation-test/index.html">foundation-test</a></li>
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</ul><h2>Example Webs</h2><ul>
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<li><a href="../goldbach/index.html">goldbach</a></li>
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<li><a href="../twinprimes/twinprimes.html">twinprimes</a></li>
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<li><a href="../eastertide/index.html">eastertide</a></li>
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<li><a href="https://github.com/ganelson/inweb"><img src="../docs-assets/github.png" height=18> github</a></li>
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</ul><h2>Related Projects</h2><ul>
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<li><a href="../../../inform/docs/index.html">inform</a></li>
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<!--Weave of 'Paragraph Macros' generated by Inweb-->
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<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="index.html">inweb</a></li><li><a href="index.html#2">Chapter 2: Parsing a Web</a></li><li><b>Paragraph Macros</b></li></ul><p class="purpose">To manage the set of named paragraph macros in a section.</p>
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<ul class="toc"><li><a href="2-pm.html#SP3">§3. Paragraph macro search</a></li></ul><hr class="tocbar">
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<p class="inwebparagraph"><a id="SP1"></a><b>§1. </b>We store these like so:
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</p>
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<pre class="display">
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<span class="reserved-syntax">typedef</span><span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">para_macro</span><span class="plain-syntax"> {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">macro_name</span><span class="plain-syntax">; </span><span class="comment"> usually long, like "Create a paragraph macro here"</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">paragraph</span><span class="plain-syntax"> *</span><span class="identifier-syntax">defining_paragraph</span><span class="plain-syntax">; </span><span class="comment"> as printed in small type after the name in any usage</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">source_line</span><span class="plain-syntax"> *</span><span class="identifier-syntax">defn_start</span><span class="plain-syntax">; </span><span class="comment"> it ends at the end of its defining paragraph</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">linked_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">macro_usages</span><span class="plain-syntax">; </span><span class="comment"> of </span><code class="display"><span class="extract-syntax">macro_usage</span></code><span class="comment">: only computed for weaves</span>
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<span class="plain-syntax"> </span><span class="constant-syntax">MEMORY_MANAGEMENT</span>
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<span class="plain-syntax">} </span><span class="reserved-syntax">para_macro</span><span class="plain-syntax">;</span>
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</pre>
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<ul class="endnotetexts"><li>The structure para_macro is accessed in 2/pn, 3/tw, 3/tt, 5/ptf, 5/tf, 5/hf, 5/df and here.</li></ul><p class="inwebparagraph"><a id="SP2"></a><b>§2. </b>Each section has its own linked list of paragraph macros, since the scope for
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the usage of these is always a single section.
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</p>
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<pre class="display">
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<span class="reserved-syntax">para_macro</span><span class="plain-syntax"> *</span><span class="function-syntax">Macros::create</span><button class="popup" onclick="togglePopup('usagePopup1')">...<span class="popuptext" id="usagePopup1">Usage of <b>Macros::create</b>:<br>The Parser - <a href="2-tp.html#SP1_1_7_4">§1.1.7.4</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">section</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="reserved-syntax">paragraph</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="reserved-syntax">source_line</span><span class="plain-syntax"> *</span><span class="identifier-syntax">L</span><span class="plain-syntax">, </span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">name</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">para_macro</span><span class="plain-syntax"> *</span><span class="identifier-syntax">pmac</span><span class="plain-syntax"> = </span><span class="identifier-syntax">CREATE</span><span class="plain-syntax">(</span><span class="reserved-syntax">para_macro</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">pmac</span><span class="plain-syntax">-></span><span class="identifier-syntax">macro_name</span><span class="plain-syntax"> = </span><a href="../foundation-module/4-sm.html#SP3" class="internal">Str::duplicate</a><span class="plain-syntax">(</span><span class="identifier-syntax">name</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">pmac</span><span class="plain-syntax">-></span><span class="identifier-syntax">defining_paragraph</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">P</span><span class="plain-syntax">-></span><span class="element-syntax">defines_macro</span><span class="plain-syntax"> = </span><span class="identifier-syntax">pmac</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">pmac</span><span class="plain-syntax">-></span><span class="identifier-syntax">defn_start</span><span class="plain-syntax"> = </span><span class="identifier-syntax">L</span><span class="plain-syntax">-></span><span class="element-syntax">next_line</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">pmac</span><span class="plain-syntax">-></span><span class="identifier-syntax">macro_usages</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NEW_LINKED_LIST</span><span class="plain-syntax">(</span><span class="reserved-syntax">macro_usage</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">ADD_TO_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">pmac</span><span class="plain-syntax">, </span><span class="reserved-syntax">para_macro</span><span class="plain-syntax">, </span><span class="identifier-syntax">S</span><span class="plain-syntax">-></span><span class="element-syntax">macros</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">pmac</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="inwebparagraph"><a id="SP3"></a><b>§3. Paragraph macro search. </b>The scope for looking up paragraph macro names is a single section, not the
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entire web. So you can't expand a macro from another section, but then again,
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you can use the same macro name twice in different sections; and lookup is
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much faster.
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</p>
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<pre class="display">
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<span class="reserved-syntax">para_macro</span><span class="plain-syntax"> *</span><span class="function-syntax">Macros::find_by_name</span><button class="popup" onclick="togglePopup('usagePopup2')">...<span class="popuptext" id="usagePopup2">Usage of <b>Macros::find_by_name</b>:<br>Paragraph Numbering - <a href="2-pn.html#SP1_1">§1.1</a><br>The Weaver - <a href="3-tw.html#SP2_7_2_3_2_6">§2.7.2.3.2.6</a><br>The Tangler - <a href="3-tt.html#SP3_1">§3.1</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">name</span><span class="plain-syntax">, </span><span class="reserved-syntax">section</span><span class="plain-syntax"> *</span><span class="identifier-syntax">scope</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">para_macro</span><span class="plain-syntax"> *</span><span class="identifier-syntax">pmac</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_OVER_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">pmac</span><span class="plain-syntax">, </span><span class="reserved-syntax">para_macro</span><span class="plain-syntax">, </span><span class="identifier-syntax">scope</span><span class="plain-syntax">-></span><span class="element-syntax">macros</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><a href="../foundation-module/4-sm.html#SP19" class="internal">Str::eq</a><span class="plain-syntax">(</span><span class="identifier-syntax">name</span><span class="plain-syntax">, </span><span class="identifier-syntax">pmac</span><span class="plain-syntax">-></span><span class="element-syntax">macro_name</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">pmac</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">NULL</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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</pre>
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<ul class="toc"><li><a href="2-tp.html">Back to 'The Parser'</a></li><li><a href="2-tgs.html">Continue with 'Tags'</a></li></ul><hr class="tocbar">
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