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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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<!--Weave of 'Literal Text' 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="../intern.html">Inter Modules</a></li><li><a href="index.html">pipeline</a></li><li><a href="index.html#5">Chapter 5: Synoptic Module</a></li><li><b>Literal Text</b></li></ul></div>
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<p class="purpose">To alphabetise literal texts, deduplicate them, and store a canonical set in the synoptic/texts submodule.</p>
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. </b>Before this runs, literal text constants are scattered all over the Inter tree.
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At the end, they are all moved into a submodule of the synoptic module called
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<span class="extract"><span class="extract-syntax">texts</span></span>, and are presented in alphabetical order (case sensitively) without
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duplicates.
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</p>
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<p class="commentary">This is not done to save memory, though it does that too, but because we want
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runtime code to be able to compare literal texts by performing an unsigned
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comparison on their addresses. The following works:
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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="identifier-syntax">let</span><span class="plain-syntax"> </span><span class="identifier-syntax">Q</span><span class="plain-syntax"> </span><span class="identifier-syntax">be</span><span class="plain-syntax"> </span><span class="string-syntax">"Rhayader"</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">if</span><span class="plain-syntax"> </span><span class="identifier-syntax">Q</span><span class="plain-syntax"> </span><span class="identifier-syntax">is</span><span class="plain-syntax"> </span><span class="string-syntax">"Rhayader"</span><span class="plain-syntax">:</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">say</span><span class="plain-syntax"> </span><span class="string-syntax">"Q is still Q, so you can relax."</span>
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</pre>
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<p class="commentary">because the two instances of <span class="extract"><span class="extract-syntax">"Rhayader"</span></span> compile to the same data in memory.
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Dynamic texts must of course be compared more expensively.
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</p>
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<p class="commentary">This cannot be arranged in the main body of the Inform compiler because these
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two instances might be much further apart than in this example — one might be
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in a kit, and the other in an unrelated extension, say.
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</p>
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<p class="commentary">Our inventory <span class="extract"><span class="extract-syntax">inv</span></span> already contains a list <span class="extract"><span class="extract-syntax">inv->text_nodes</span></span> of constant
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definitions whose value is a literal text.
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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">SynopticText::compile</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">SynopticText::compile</span></span>:<br/>Make Synoptic Module Stage - <a href="5-msms.html#SP1">§1</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">inter_tree</span><span class="plain-syntax"> *</span><span class="identifier-syntax">I</span><span class="plain-syntax">, </span><span class="reserved-syntax">pipeline_step</span><span class="plain-syntax"> *</span><span class="identifier-syntax">step</span><span class="plain-syntax">, </span><span class="reserved-syntax">tree_inventory</span><span class="plain-syntax"> *</span><span class="identifier-syntax">inv</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">InterNodeList::array_len</span><span class="plain-syntax">(</span><span class="identifier-syntax">inv</span><span class="plain-syntax">-></span><span class="element-syntax">text_nodes</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="identifier-syntax">InterNodeList::array_sort</span><span class="plain-syntax">(</span><span class="identifier-syntax">inv</span><span class="plain-syntax">-></span><span class="element-syntax">text_nodes</span><span class="plain-syntax">, </span><a href="5-lt.html#SP2" class="function-link"><span class="function-syntax">SynopticText::cmp</span></a><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">inter_package</span><span class="plain-syntax"> *</span><span class="identifier-syntax">texts_pack</span><span class="plain-syntax"> =</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Packaging::incarnate</span><span class="plain-syntax">(</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">LargeScale::synoptic_submodule</span><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">LargeScale::register_submodule_identity</span><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="string-syntax">"text"</span><span class="plain-syntax">)));</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">inter_bookmark</span><span class="plain-syntax"> </span><span class="identifier-syntax">IBM</span><span class="plain-syntax"> = </span><span class="identifier-syntax">InterBookmark::at_end_of_this_package</span><span class="plain-syntax">(</span><span class="identifier-syntax">texts_pack</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">latest_text</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">inter_symbol</span><span class="plain-syntax"> *</span><span class="identifier-syntax">latest_s</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="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax">=0, </span><span class="identifier-syntax">j</span><span class="plain-syntax">=0; </span><span class="identifier-syntax">i</span><span class="function-syntax"><InterNodeList::array_len(inv-></span><span class="element-syntax">text_nodes</span><span class="plain-syntax">); </span><span class="identifier-syntax">i</span><span class="plain-syntax">++) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</span><span class="plain-syntax"> = </span><span class="identifier-syntax">inv</span><span class="plain-syntax">-></span><span class="element-syntax">text_nodes</span><span class="plain-syntax">-></span><span class="identifier-syntax">list</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">].</span><span class="identifier-syntax">node</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">inter_package</span><span class="plain-syntax"> *</span><span class="identifier-syntax">pack</span><span class="plain-syntax"> = </span><span class="identifier-syntax">InterPackage::container</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">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax"> = </span><a href="5-lt.html#SP2" class="function-link"><span class="function-syntax">SynopticText::text_quoted_here</span></a><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">latest_text</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) || (</span><span class="identifier-syntax">Str::ne</span><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="identifier-syntax">latest_text</span><span class="plain-syntax">)))</span>
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<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="5-lt.html#SP1_1" class="named-paragraph-link"><span class="named-paragraph">A new entry, not a duplicated one</span><span class="named-paragraph-number">1.1</span></a></span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="5-lt.html#SP1_2" class="named-paragraph-link"><span class="named-paragraph">Change the value in P from a literal text to an alias for the latest text</span><span class="named-paragraph-number">1.2</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>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP1_1" class="paragraph-anchor"></a><b>§1.1. </b>If the list reads <span class="extract"><span class="extract-syntax">"apple", "apple", "banana", "cauliflower", "cauliflower"</span></span>,
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this will be executed on the first <span class="extract"><span class="extract-syntax">"apple"</span></span>, on <span class="extract"><span class="extract-syntax">"banana"</span></span> and the first
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<span class="extract"><span class="extract-syntax">"cauliflower"</span></span>. They will lead to definitions in the texts module like so:
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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">constant</span><span class="plain-syntax"> alphabetised_text_0 </span><span class="identifier-syntax">K_unchecked</span><span class="plain-syntax"> = </span><span class="string-syntax">"apple"</span><span class="plain-syntax"> </span><span class="identifier-syntax">__text_literal</span><span class="plain-syntax">=1</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">constant</span><span class="plain-syntax"> alphabetised_text_1 </span><span class="identifier-syntax">K_unchecked</span><span class="plain-syntax"> = </span><span class="string-syntax">"banana"</span><span class="plain-syntax"> </span><span class="identifier-syntax">__text_literal</span><span class="plain-syntax">=1</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">constant</span><span class="plain-syntax"> alphabetised_text_2 </span><span class="identifier-syntax">K_unchecked</span><span class="plain-syntax"> = </span><span class="string-syntax">"cauliflower"</span><span class="plain-syntax"> </span><span class="identifier-syntax">__text_literal</span><span class="plain-syntax">=1</span>
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</pre>
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<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">A new entry, not a duplicated one</span><span class="named-paragraph-number">1.1</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="identifier-syntax">TEMPORARY_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">A</span><span class="plain-syntax">)</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">A</span><span class="plain-syntax">, </span><span class="string-syntax">"alphabetised_text_%d"</span><span class="plain-syntax">, </span><span class="identifier-syntax">j</span><span class="plain-syntax">++);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">inter_symbol</span><span class="plain-syntax"> *</span><span class="identifier-syntax">alpha_s</span><span class="plain-syntax"> = </span><a href="5-su.html#SP3" class="function-link"><span class="function-syntax">Synoptic::new_symbol</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">texts_pack</span><span class="plain-syntax">, </span><span class="identifier-syntax">A</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">DISCARD_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">A</span><span class="plain-syntax">)</span>
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<span class="plain-syntax"> </span><a href="5-su.html#SP4" class="function-link"><span class="function-syntax">Synoptic::textual_constant</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">, </span><span class="identifier-syntax">step</span><span class="plain-syntax">, </span><span class="identifier-syntax">alpha_s</span><span class="plain-syntax">, </span><span class="identifier-syntax">S</span><span class="plain-syntax">, &</span><span class="identifier-syntax">IBM</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">latest_s</span><span class="plain-syntax"> = </span><span class="identifier-syntax">alpha_s</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">latest_text</span><span class="plain-syntax"> = </span><span class="identifier-syntax">S</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="5-lt.html#SP1">§1</a>.</li></ul>
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<p class="commentary firstcommentary"><a id="SP1_2" class="paragraph-anchor"></a><b>§1.2. </b>This is run on every P in the list. It begins as, for example,
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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">constant</span><span class="plain-syntax"> (text_literal) whatever = </span><span class="string-syntax">"banana"</span>
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</pre>
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<p class="commentary">and becomes:
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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">constant</span><span class="plain-syntax"> whatever = ref_to_text</span>
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</pre>
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<p class="commentary">where <span class="extract"><span class="extract-syntax">ref_text_2</span></span> in the current package is equated to <span class="extract"><span class="extract-syntax">alphabetised_text_1</span></span>
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in <span class="extract"><span class="extract-syntax">texts</span></span>.
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</p>
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<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Change the value in P from a literal text to an alias for the latest text</span><span class="named-paragraph-number">1.2</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="identifier-syntax">inter_symbol</span><span class="plain-syntax"> *</span><span class="identifier-syntax">ref_s</span><span class="plain-syntax"> = </span><a href="5-su.html#SP3" class="function-link"><span class="function-syntax">Synoptic::new_symbol</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">pack</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"ref_to_text"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Wiring::wire_to</span><span class="plain-syntax">(</span><span class="identifier-syntax">ref_s</span><span class="plain-syntax">, </span><span class="identifier-syntax">latest_s</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">inter_pair</span><span class="plain-syntax"> </span><span class="identifier-syntax">val</span><span class="plain-syntax"> = </span><span class="identifier-syntax">InterValuePairs::symbolic_in</span><span class="plain-syntax">(</span><span class="identifier-syntax">InterPackage::container</span><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">), </span><span class="identifier-syntax">ref_s</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">ConstantInstruction::set_constant</span><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="identifier-syntax">val</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">ConstantInstruction::set_type</span><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="identifier-syntax">InterTypes::unchecked</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="5-lt.html#SP1">§1</a>.</li></ul>
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<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>§2. </b>Here we extract the actual text from a node defining a constant literal text,
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and use that to define a sorting function on nodes:
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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">SynopticText::text_quoted_here</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">SynopticText::text_quoted_here</span></span>:<br/><a href="5-lt.html#SP1">§1</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">inter_tree_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">ConstantInstruction::list_format</span><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">) == </span><span class="identifier-syntax">CONST_LIST_FORMAT_NONE</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">inter_pair</span><span class="plain-syntax"> </span><span class="identifier-syntax">val</span><span class="plain-syntax"> = </span><span class="identifier-syntax">ConstantInstruction::constant</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">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">InterValuePairs::to_text</span><span class="plain-syntax">(</span><span class="identifier-syntax">Inode::tree</span><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">), </span><span class="identifier-syntax">val</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">NULL</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">SynopticText::cmp</span><button class="popup" onclick="togglePopup('usagePopup3')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup3">Usage of <span class="code-font"><span class="function-syntax">SynopticText::cmp</span></span>:<br/><a href="5-lt.html#SP1">§1</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">const</span><span class="plain-syntax"> </span><span class="reserved-syntax">void</span><span class="plain-syntax"> *</span><span class="identifier-syntax">ent1</span><span class="plain-syntax">, </span><span class="reserved-syntax">const</span><span class="plain-syntax"> </span><span class="reserved-syntax">void</span><span class="plain-syntax"> *</span><span class="identifier-syntax">ent2</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">ina_entry</span><span class="plain-syntax"> *</span><span class="identifier-syntax">E1</span><span class="plain-syntax"> = (</span><span class="identifier-syntax">ina_entry</span><span class="plain-syntax"> *) </span><span class="identifier-syntax">ent1</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">ina_entry</span><span class="plain-syntax"> *</span><span class="identifier-syntax">E2</span><span class="plain-syntax"> = (</span><span class="identifier-syntax">ina_entry</span><span class="plain-syntax"> *) </span><span class="identifier-syntax">ent2</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">E1</span><span class="plain-syntax"> == </span><span class="identifier-syntax">E2</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="identifier-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P1</span><span class="plain-syntax"> = </span><span class="identifier-syntax">E1</span><span class="plain-syntax">-></span><span class="identifier-syntax">node</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P2</span><span class="plain-syntax"> = </span><span class="identifier-syntax">E2</span><span class="plain-syntax">-></span><span class="identifier-syntax">node</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">S1</span><span class="plain-syntax"> = </span><a href="5-lt.html#SP2" class="function-link"><span class="function-syntax">SynopticText::text_quoted_here</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">P1</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">S2</span><span class="plain-syntax"> = </span><a href="5-lt.html#SP2" class="function-link"><span class="function-syntax">SynopticText::text_quoted_here</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">P2</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">Str::cmp</span><span class="plain-syntax">(</span><span class="identifier-syntax">S1</span><span class="plain-syntax">, </span><span class="identifier-syntax">S2</span><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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</pre>
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