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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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<main role="main">
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<!--Weave of 'Census' 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="../inbuildn.html">Inbuild Modules</a></li><li><a href="index.html">supervisor</a></li><li><a href="index.html#7">Chapter 7: Extension Indexing</a></li><li><b>Census</b></li></ul></div>
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<p class="purpose">To conduct a census of all installed extensions installed.</p>
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<ul class="toc"><li><a href="7-cns.html#SP1">§1. Beginning</a></li><li><a href="7-cns.html#SP4">§4. Census data</a></li><li><a href="7-cns.html#SP6">§6. Performing the census</a></li></ul><hr class="tocbar">
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. Beginning. </b>Each census begins by creating an object:
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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">typedef</span><span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">extension_census</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="identifier-syntax">linked_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">search_list</span><span class="plain-syntax">; </span><span class="comment-syntax"> of </span><span class="extract"><span class="extract-syntax">inbuild_nest</span></span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">linked_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">census_data</span><span class="plain-syntax">; </span><span class="comment-syntax"> of </span><span class="extract"><span class="extract-syntax">extension_census_datum</span></span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">linked_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">raw_data</span><span class="plain-syntax">; </span><span class="comment-syntax"> of </span><span class="extract"><span class="extract-syntax">inbuild_search_result</span></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">no_census_errors</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">CLASS_DEFINITION</span>
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<span class="plain-syntax">} </span><span class="reserved-syntax">extension_census</span><span class="plain-syntax">;</span>
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</pre>
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<ul class="endnotetexts"><li>The structure extension_census is accessed in 5/es, 5/ps2 and here.</li></ul>
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<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>§2. </b>Here <span class="extract"><span class="extract-syntax">proj</span></span> will be null in case (a), and will be the project just
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compiled in case (b).
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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">extension_census</span><span class="plain-syntax"> *</span><span class="function-syntax">ExtensionCensus::new</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">ExtensionCensus::new</span></span>:<br/><a href="7-cns.html#SP6">§6</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inform_project</span><span class="plain-syntax"> *</span><span class="identifier-syntax">proj</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">extension_census</span><span class="plain-syntax"> *</span><span class="identifier-syntax">C</span><span class="plain-syntax"> = </span><span class="identifier-syntax">CREATE</span><span class="plain-syntax">(</span><span class="reserved-syntax">extension_census</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">proj</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">C</span><span class="plain-syntax">-></span><span class="identifier-syntax">search_list</span><span class="plain-syntax"> = </span><a href="5-ps2.html#SP7" class="function-link"><span class="function-syntax">Projects::nest_list</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">proj</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">C</span><span class="plain-syntax">-></span><span class="identifier-syntax">search_list</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NEW_LINKED_LIST</span><span class="plain-syntax">(</span><span class="reserved-syntax">inbuild_nest</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">C</span><span class="plain-syntax">-></span><span class="element-syntax">search_list</span><span class="plain-syntax">, </span><span class="reserved-syntax">inbuild_nest</span><span class="plain-syntax">, </span><span class="identifier-syntax">proj</span><span class="plain-syntax">-></span><span class="element-syntax">search_list</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">inbuild_nest</span><span class="plain-syntax"> *</span><span class="identifier-syntax">N</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">linked_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">L</span><span class="plain-syntax"> = </span><a href="1-ic.html#SP16" class="function-link"><span class="function-syntax">Supervisor::shared_nest_list</span></a><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">N</span><span class="plain-syntax">, </span><span class="reserved-syntax">inbuild_nest</span><span class="plain-syntax">, </span><span class="identifier-syntax">L</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="2-nst.html#SP2" class="function-link"><span class="function-syntax">Nests::get_tag</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">N</span><span class="plain-syntax">) == </span><span class="constant-syntax">INTERNAL_NEST_TAG</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">N</span><span class="plain-syntax">, </span><span class="reserved-syntax">inbuild_nest</span><span class="plain-syntax">, </span><span class="identifier-syntax">C</span><span class="plain-syntax">-></span><span class="element-syntax">search_list</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">C</span><span class="plain-syntax">-></span><span class="element-syntax">census_data</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NEW_LINKED_LIST</span><span class="plain-syntax">(</span><span class="reserved-syntax">extension_census_datum</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">C</span><span class="plain-syntax">-></span><span class="element-syntax">raw_data</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NEW_LINKED_LIST</span><span class="plain-syntax">(</span><span class="reserved-syntax">inbuild_search_result</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">C</span><span class="plain-syntax">-></span><span class="element-syntax">no_census_errors</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</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">C</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>Each census object has its own search path for nests — for case (a) the
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shared search path, for (b) the project's search path.
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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">pathname</span><span class="plain-syntax"> *</span><span class="function-syntax">ExtensionCensus::internal_path</span><span class="plain-syntax">(</span><span class="reserved-syntax">extension_census</span><span class="plain-syntax"> *</span><span class="identifier-syntax">C</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">inbuild_nest</span><span class="plain-syntax"> *</span><span class="identifier-syntax">N</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">LOOP_OVER_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">N</span><span class="plain-syntax">, </span><span class="reserved-syntax">inbuild_nest</span><span class="plain-syntax">, </span><span class="identifier-syntax">C</span><span class="plain-syntax">-></span><span class="element-syntax">search_list</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="2-nst.html#SP2" class="function-link"><span class="function-syntax">Nests::get_tag</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">N</span><span class="plain-syntax">) == </span><span class="constant-syntax">INTERNAL_NEST_TAG</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="4-em.html#SP3" class="function-link"><span class="function-syntax">ExtensionManager::path_within_nest</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">N</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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<span class="identifier-syntax">pathname</span><span class="plain-syntax"> *</span><span class="function-syntax">ExtensionCensus::external_path</span><span class="plain-syntax">(</span><span class="reserved-syntax">extension_census</span><span class="plain-syntax"> *</span><span class="identifier-syntax">C</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">inbuild_nest</span><span class="plain-syntax"> *</span><span class="identifier-syntax">N</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">LOOP_OVER_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">N</span><span class="plain-syntax">, </span><span class="reserved-syntax">inbuild_nest</span><span class="plain-syntax">, </span><span class="identifier-syntax">C</span><span class="plain-syntax">-></span><span class="element-syntax">search_list</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="2-nst.html#SP2" class="function-link"><span class="function-syntax">Nests::get_tag</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">N</span><span class="plain-syntax">) == </span><span class="constant-syntax">EXTERNAL_NEST_TAG</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="4-em.html#SP3" class="function-link"><span class="function-syntax">ExtensionManager::path_within_nest</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">N</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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<p class="commentary firstcommentary"><a id="SP4" class="paragraph-anchor"></a><b>§4. Census data. </b>For each inhabitant found, so to speak, an instance of <a href="7-cns.html#SP4" class="internal">extension_census_datum</a>
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is created. (These are called ECDs below.)
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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">typedef</span><span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">extension_census_datum</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">inbuild_search_result</span><span class="plain-syntax"> *</span><span class="identifier-syntax">found_as</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">overriding_a_built_in_extension</span><span class="plain-syntax">; </span><span class="comment-syntax"> not built in, but overriding one which is</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">extension_census_datum</span><span class="plain-syntax"> *</span><span class="identifier-syntax">next</span><span class="plain-syntax">; </span><span class="comment-syntax"> next one in lexicographic order</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">CLASS_DEFINITION</span>
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<span class="plain-syntax">} </span><span class="reserved-syntax">extension_census_datum</span><span class="plain-syntax">;</span>
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</pre>
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<ul class="endnotetexts"><li>The structure extension_census_datum is accessed in 6/hdn, 6/inc, 7/dct, 7/ip2 and here.</li></ul>
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<p class="commentary firstcommentary"><a id="SP5" class="paragraph-anchor"></a><b>§5. </b>An ECD is actually a wrapper for an <a href="5-es.html#SP1" class="internal">inform_extension</a> object in disguise,
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since the <a href="2-nst.html#SP7" class="internal">inbuild_search_result</a> found that.
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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">text_stream</span><span class="plain-syntax"> *</span><span class="function-syntax">ExtensionCensus::ecd_rubric</span><span class="plain-syntax">(</span><span class="reserved-syntax">extension_census_datum</span><span class="plain-syntax"> *</span><span class="identifier-syntax">ecd</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="5-es.html#SP14" class="function-link"><span class="function-syntax">Extensions::get_rubric</span></a><span class="plain-syntax">(</span><a href="5-es.html#SP4" class="function-link"><span class="function-syntax">Extensions::from_copy</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">ecd</span><span class="plain-syntax">-></span><span class="element-syntax">found_as</span><span class="plain-syntax">-></span><span class="element-syntax">copy</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="function-syntax">ExtensionCensus::installation_region</span><span class="plain-syntax">(</span><span class="reserved-syntax">extension_census_datum</span><span class="plain-syntax"> *</span><span class="identifier-syntax">ecd</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="2-nst.html#SP2" class="function-link"><span class="function-syntax">Nests::get_tag</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">ecd</span><span class="plain-syntax">-></span><span class="element-syntax">found_as</span><span class="plain-syntax">-></span><span class="element-syntax">nest</span><span class="plain-syntax">) == </span><span class="constant-syntax">MATERIALS_NEST_TAG</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">0</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="2-nst.html#SP2" class="function-link"><span class="function-syntax">Nests::get_tag</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">ecd</span><span class="plain-syntax">-></span><span class="element-syntax">found_as</span><span class="plain-syntax">-></span><span class="element-syntax">nest</span><span class="plain-syntax">) == </span><span class="constant-syntax">INTERNAL_NEST_TAG</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">1</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">ecd</span><span class="plain-syntax">-></span><span class="element-syntax">overriding_a_built_in_extension</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">2</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="constant-syntax">3</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="function-syntax">ExtensionCensus::ecd_used</span><span class="plain-syntax">(</span><span class="reserved-syntax">extension_census_datum</span><span class="plain-syntax"> *</span><span class="identifier-syntax">ecd</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">inform_extension</span><span class="plain-syntax"> *</span><span class="identifier-syntax">E</span><span class="plain-syntax"> = </span><a href="5-es.html#SP4" class="function-link"><span class="function-syntax">Extensions::from_copy</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">ecd</span><span class="plain-syntax">-></span><span class="element-syntax">found_as</span><span class="plain-syntax">-></span><span class="element-syntax">copy</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">E</span><span class="plain-syntax">-></span><span class="element-syntax">has_historically_been_used</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="SP6" class="paragraph-anchor"></a><b>§6. Performing the census. </b>For some reason a census often makes a good story (cf. Luke 2:1-5), but here
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there's disappointingly little to tell, because the work is all done by a
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single call to <a href="2-nst.html#SP9" class="internal">Nests::search_for</a>.
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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">extension_census</span><span class="plain-syntax"> *</span><span class="function-syntax">ExtensionCensus::perform</span><button class="popup" onclick="togglePopup('usagePopup2')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup2">Usage of <span class="code-font"><span class="function-syntax">ExtensionCensus::perform</span></span>:<br/>The Mini-Website - <a href="7-tm.html#SP2">§2</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inform_project</span><span class="plain-syntax"> *</span><span class="identifier-syntax">proj</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">extension_census</span><span class="plain-syntax"> *</span><span class="identifier-syntax">C</span><span class="plain-syntax"> = </span><a href="7-cns.html#SP2" class="function-link"><span class="function-syntax">ExtensionCensus::new</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">proj</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">inbuild_requirement</span><span class="plain-syntax"> *</span><span class="identifier-syntax">req</span><span class="plain-syntax"> = </span><a href="2-rqr.html#SP2" class="function-link"><span class="function-syntax">Requirements::anything_of_genre</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">extension_genre</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="2-nst.html#SP9" class="function-link"><span class="function-syntax">Nests::search_for</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">req</span><span class="plain-syntax">, </span><span class="identifier-syntax">C</span><span class="plain-syntax">-></span><span class="element-syntax">search_list</span><span class="plain-syntax">, </span><span class="identifier-syntax">C</span><span class="plain-syntax">-></span><span class="element-syntax">raw_data</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">inbuild_search_result</span><span class="plain-syntax"> *</span><span class="identifier-syntax">R</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">R</span><span class="plain-syntax">, </span><span class="reserved-syntax">inbuild_search_result</span><span class="plain-syntax">, </span><span class="identifier-syntax">C</span><span class="plain-syntax">-></span><span class="element-syntax">raw_data</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">C</span><span class="plain-syntax">-></span><span class="identifier-syntax">no_census_errors</span><span class="plain-syntax"> += </span><span class="identifier-syntax">LinkedLists::len</span><span class="plain-syntax">(</span><span class="identifier-syntax">R</span><span class="plain-syntax">-></span><span class="element-syntax">copy</span><span class="plain-syntax">-></span><span class="element-syntax">errors_reading_source_text</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">overridden_by_an_extension_already_found</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="7-cns.html#SP6_1" class="named-paragraph-link"><span class="named-paragraph">See if already known from existing data</span><span class="named-paragraph-number">6.1</span></a></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">overridden_by_an_extension_already_found</span><span class="plain-syntax"> == </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">)</span>
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<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="7-cns.html#SP6_2" class="named-paragraph-link"><span class="named-paragraph">Add to the census data</span><span class="named-paragraph-number">6.2</span></a></span><span class="plain-syntax">;</span>
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<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">C</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="SP6_1" class="paragraph-anchor"></a><b>§6.1. </b>Recall that the higher-priority materials and external nests are scanned
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first, so if we find that our new extension has the same title and author as
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one already known, it must be one that is overridden.
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</p>
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<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">See if already known from existing data</span><span class="named-paragraph-number">6.1</span></span><span class="comment-syntax"> =</span>
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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="reserved-syntax">extension_census_datum</span><span class="plain-syntax"> *</span><span class="identifier-syntax">other</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">other</span><span class="plain-syntax">, </span><span class="reserved-syntax">extension_census_datum</span><span class="plain-syntax">, </span><span class="identifier-syntax">C</span><span class="plain-syntax">-></span><span class="element-syntax">census_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><a href="2-wrk.html#SP9" class="function-link"><span class="function-syntax">Works::match</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">R</span><span class="plain-syntax">-></span><span class="element-syntax">copy</span><span class="plain-syntax">-></span><span class="element-syntax">edition</span><span class="plain-syntax">-></span><span class="element-syntax">work</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">other</span><span class="plain-syntax">-></span><span class="element-syntax">found_as</span><span class="plain-syntax">-></span><span class="element-syntax">copy</span><span class="plain-syntax">-></span><span class="element-syntax">edition</span><span class="plain-syntax">-></span><span class="element-syntax">work</span><span class="plain-syntax">)) &&</span>
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<span class="plain-syntax"> ((</span><a href="2-nst.html#SP2" class="function-link"><span class="function-syntax">Nests::get_tag</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">other</span><span class="plain-syntax">-></span><span class="element-syntax">found_as</span><span class="plain-syntax">-></span><span class="element-syntax">nest</span><span class="plain-syntax">) == </span><span class="constant-syntax">INTERNAL_NEST_TAG</span><span class="plain-syntax">) ||</span>
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<span class="plain-syntax"> (</span><a href="2-nst.html#SP2" class="function-link"><span class="function-syntax">Nests::get_tag</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">R</span><span class="plain-syntax">-></span><span class="element-syntax">nest</span><span class="plain-syntax">) == </span><span class="constant-syntax">INTERNAL_NEST_TAG</span><span class="plain-syntax">))) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">other</span><span class="plain-syntax">-></span><span class="element-syntax">overriding_a_built_in_extension</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">overridden_by_an_extension_already_found</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>
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</pre>
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<ul class="endnotetexts"><li>This code is used in <a href="7-cns.html#SP6">§6</a>.</li></ul>
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<p class="commentary firstcommentary"><a id="SP6_2" class="paragraph-anchor"></a><b>§6.2. </b>Assuming the new extension was not overridden in this way, we come here.
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Because we didn't check the version number text for validity, it might
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through being invalid be longer than we expect: in case this is so, we
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truncate it.
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</p>
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<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Add to the census data</span><span class="named-paragraph-number">6.2</span></span><span class="comment-syntax"> =</span>
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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="reserved-syntax">extension_census_datum</span><span class="plain-syntax"> *</span><span class="identifier-syntax">ecd</span><span class="plain-syntax"> = </span><span class="identifier-syntax">CREATE</span><span class="plain-syntax">(</span><span class="reserved-syntax">extension_census_datum</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">ecd</span><span class="plain-syntax">-></span><span class="element-syntax">found_as</span><span class="plain-syntax"> = </span><span class="identifier-syntax">R</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">ecd</span><span class="plain-syntax">-></span><span class="element-syntax">overriding_a_built_in_extension</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">ecd</span><span class="plain-syntax">-></span><span class="element-syntax">next</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
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</pre>
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<ul class="endnotetexts"><li>This code is used in <a href="7-cns.html#SP6">§6</a>.</li></ul>
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