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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<title>27/hr</title>
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<meta name="viewport" content="width=device-width initial-scale=1">
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<h1><a href="../webs.html">Sources</a></h1>
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<ul>
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<li><a href="../compiler.html"><b>compiler tools</b></a></li>
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<h2>Compiler Webs</h2>
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<li><a href="../inbuild/index.html">inbuild</a></li>
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<h2>Inbuild Modules</h2>
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<li><a href="../inbuild-module/index.html">inbuild</a></li>
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<li><a href="../codegen-module/index.html">codegen</a></li>
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<h2>Foundation</h2>
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<ul>
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<li><a href="../../../inweb/docs/foundation-module/index.html">foundation</a></li>
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</ul>
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</nav>
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<main role="main">
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<!--Weave of '27/cm' generated by 7-->
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<ul class="crumbs"><li><a href="../webs.html">Source</a></li><li><a href="../compiler.html">Compiler Modules</a></li><li><a href="index.html">core</a></li><li><a href="index.html#27">Chapter 27: Bridge to Inter Module</a></li><li><b>Compilation Modules</b></li></ul><p class="purpose">To identify which parts of the source text come from which source (the main source text, the Standard Rules, or another extension).</p>
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<ul class="toc"><li><a href="#SP1">§1. Compilation modules</a></li><li><a href="#SP6">§6. Current module</a></li><li><a href="#SP7">§7. Relating to Inter</a></li></ul><hr class="tocbar">
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<p class="inwebparagraph"><a id="SP1"></a><b>§1. Compilation modules. </b>Inform is a language in which it is semantically relevant which source file the
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source text is coming from: unlike, say, C, where <code class="display"><span class="extract">#include</span></code> allows files to include
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each other in arbitrary ways. In Inform, all source text comes from one of the
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following places:
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</p>
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<p class="inwebparagraph"></p>
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<ul class="items"><li>(a) The main source text, as shown in the Source panel of the UI app;
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</li><li>(b) An extension file, including the Standard Rules extension;
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</li><li>(c) Invented text created by the compiler itself.
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</li></ul>
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<p class="inwebparagraph">The Inter hierarchy also splits, with named modules representing each possibility
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in (a) or (b) above. This section of code determines to which module any new
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definition (of, say, a property or kind) belongs.
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</p>
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<pre class="display">
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<span class="identifier">compilation_module</span><span class="plain"> *</span><span class="identifier">source_text_module</span><span class="plain"> = </span><span class="identifier">NULL</span><span class="plain">; </span><span class="comment">the one for the main text</span>
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<span class="identifier">compilation_module</span><span class="plain"> *</span><span class="identifier">SR_module</span><span class="plain"> = </span><span class="identifier">NULL</span><span class="plain">; </span><span class="comment">the one for the Standard Rules</span>
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<span class="identifier">compilation_module</span><span class="plain"> *</span><span class="functiontext">Modules::SR</span><span class="plain">(</span><span class="reserved">void</span><span class="plain">) {</span>
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<span class="reserved">return</span><span class="plain"> </span><span class="identifier">SR_module</span><span class="plain">;</span>
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<span class="plain">}</span>
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</pre>
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<p class="inwebparagraph"></p>
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<p class="endnote">The function Modules::SR is used in 21/rl (<a href="21-rl.html#SP26">§26</a>).</p>
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<p class="inwebparagraph"><a id="SP2"></a><b>§2. </b>We find these by performing a traverse of the parse tree, and looking for
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level-0 headings, which are the nodes from which these blocks of source text hang:
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</p>
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<pre class="display">
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<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">Modules::traverse_to_define</span><span class="plain">(</span><span class="reserved">void</span><span class="plain">) {</span>
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<span class="identifier">ParseTree::traverse</span><span class="plain">(</span><span class="functiontext">Task::syntax_tree</span><span class="plain">(), </span><span class="functiontext">Modules::look_for_cu</span><span class="plain">);</span>
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<span class="plain">}</span>
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<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">Modules::look_for_cu</span><span class="plain">(</span><span class="identifier">parse_node</span><span class="plain"> *</span><span class="identifier">p</span><span class="plain">) {</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">ParseTree::get_type</span><span class="plain">(</span><span class="identifier">p</span><span class="plain">) == </span><span class="identifier">HEADING_NT</span><span class="plain">) {</span>
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<span class="identifier">heading</span><span class="plain"> *</span><span class="identifier">h</span><span class="plain"> = </span><span class="identifier">Headings::from_node</span><span class="plain">(</span><span class="identifier">p</span><span class="plain">);</span>
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<span class="reserved">if</span><span class="plain"> ((</span><span class="identifier">h</span><span class="plain">) && (</span><span class="identifier">h</span><span class="plain">-></span><span class="identifier">level</span><span class="plain"> == </span><span class="constant">0</span><span class="plain">)) </span><span class="functiontext">Modules::new</span><span class="plain">(</span><span class="identifier">p</span><span class="plain">);</span>
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<span class="plain">}</span>
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<span class="plain">}</span>
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<span class="identifier">compilation_module</span><span class="plain"> *</span><span class="functiontext">Modules::new</span><span class="plain">(</span><span class="identifier">parse_node</span><span class="plain"> *</span><span class="identifier">from</span><span class="plain">) {</span>
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<span class="identifier">source_location</span><span class="plain"> </span><span class="identifier">sl</span><span class="plain"> = </span><span class="identifier">Wordings::location</span><span class="plain">(</span><span class="identifier">ParseTree::get_text</span><span class="plain">(</span><span class="identifier">from</span><span class="plain">));</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">sl</span><span class="plain">.</span><span class="identifier">file_of_origin</span><span class="plain"> == </span><span class="identifier">NULL</span><span class="plain">) </span><span class="identifier">internal_error</span><span class="plain">(</span><span class="string">"null foo"</span><span class="plain">);</span>
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<span class="identifier">inform_extension</span><span class="plain"> *</span><span class="identifier">owner</span><span class="plain"> = </span><span class="identifier">Extensions::corresponding_to</span><span class="plain">(</span>
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<span class="identifier">Lexer::file_of_origin</span><span class="plain">(</span><span class="identifier">Wordings::first_wn</span><span class="plain">(</span><span class="identifier">ParseTree::get_text</span><span class="plain">(</span><span class="identifier">from</span><span class="plain">))));</span>
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<span class="identifier">compilation_module</span><span class="plain"> *</span><span class="identifier">C</span><span class="plain"> = </span><span class="identifier">Packaging::new_cm</span><span class="plain">();</span>
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<span class="identifier">C</span><span class="plain">-></span><span class="identifier">hanging_from</span><span class="plain"> = </span><span class="identifier">from</span><span class="plain">;</span>
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<span class="identifier">ParseTree::set_module</span><span class="plain">(</span><span class="identifier">from</span><span class="plain">, </span><span class="identifier">C</span><span class="plain">);</span>
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<span class="functiontext">Modules::propagate_downwards</span><span class="plain">(</span><span class="identifier">from</span><span class="plain">-></span><span class="element">down</span><span class="plain">, </span><span class="identifier">C</span><span class="plain">);</span>
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<span class="identifier">TEMPORARY_TEXT</span><span class="plain">(</span><span class="identifier">pname</span><span class="plain">);</span>
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<<span class="cwebmacro">Compose a name for the module package this will lead to</span> <span class="cwebmacronumber">2.1</span>><span class="plain">;</span>
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<span class="identifier">C</span><span class="plain">-></span><span class="identifier">inter_presence</span><span class="plain"> = </span><span class="identifier">Packaging::get_module</span><span class="plain">(</span><span class="functiontext">Emit::tree</span><span class="plain">(), </span><span class="identifier">pname</span><span class="plain">);</span>
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<span class="identifier">DISCARD_TEXT</span><span class="plain">(</span><span class="identifier">pname</span><span class="plain">);</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">owner</span><span class="plain">) {</span>
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<span class="functiontext">Hierarchy::markup</span><span class="plain">(</span><span class="identifier">C</span><span class="plain">-></span><span class="identifier">inter_presence</span><span class="plain">-></span><span class="identifier">the_package</span><span class="plain">, </span><span class="constant">EXT_AUTHOR_HMD</span><span class="plain">, </span><span class="identifier">owner</span><span class="plain">-></span><span class="identifier">as_copy</span><span class="plain">-></span><span class="identifier">edition</span><span class="plain">-></span><span class="identifier">work</span><span class="plain">-></span><span class="identifier">raw_author_name</span><span class="plain">);</span>
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<span class="functiontext">Hierarchy::markup</span><span class="plain">(</span><span class="identifier">C</span><span class="plain">-></span><span class="identifier">inter_presence</span><span class="plain">-></span><span class="identifier">the_package</span><span class="plain">, </span><span class="constant">EXT_TITLE_HMD</span><span class="plain">, </span><span class="identifier">owner</span><span class="plain">-></span><span class="identifier">as_copy</span><span class="plain">-></span><span class="identifier">edition</span><span class="plain">-></span><span class="identifier">work</span><span class="plain">-></span><span class="identifier">raw_title</span><span class="plain">);</span>
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<span class="identifier">TEMPORARY_TEXT</span><span class="plain">(</span><span class="identifier">V</span><span class="plain">);</span>
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<span class="identifier">semantic_version_number</span><span class="plain"> </span><span class="identifier">N</span><span class="plain"> = </span><span class="identifier">owner</span><span class="plain">-></span><span class="identifier">as_copy</span><span class="plain">-></span><span class="identifier">edition</span><span class="plain">-></span><span class="identifier">version</span><span class="plain">;</span>
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<span class="identifier">WRITE_TO</span><span class="plain">(</span><span class="identifier">V</span><span class="plain">, </span><span class="string">"%v"</span><span class="plain">, &</span><span class="identifier">N</span><span class="plain">);</span>
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<span class="functiontext">Hierarchy::markup</span><span class="plain">(</span><span class="identifier">C</span><span class="plain">-></span><span class="identifier">inter_presence</span><span class="plain">-></span><span class="identifier">the_package</span><span class="plain">, </span><span class="constant">EXT_VERSION_HMD</span><span class="plain">, </span><span class="identifier">V</span><span class="plain">);</span>
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<span class="identifier">DISCARD_TEXT</span><span class="plain">(</span><span class="identifier">V</span><span class="plain">);</span>
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<span class="plain">}</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">Extensions::is_standard</span><span class="plain">(</span><span class="identifier">owner</span><span class="plain">)) </span><span class="identifier">SR_module</span><span class="plain"> = </span><span class="identifier">C</span><span class="plain">;</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">owner</span><span class="plain"> == </span><span class="identifier">NULL</span><span class="plain">) </span><span class="identifier">source_text_module</span><span class="plain"> = </span><span class="identifier">C</span><span class="plain">;</span>
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<span class="reserved">return</span><span class="plain"> </span><span class="identifier">C</span><span class="plain">;</span>
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<span class="plain">}</span>
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</pre>
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<p class="inwebparagraph"></p>
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<p class="endnote">The function Modules::traverse_to_define is used in 1/htc (<a href="1-htc.html#SP2_3">§2.3</a>).</p>
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<p class="endnote">The function Modules::look_for_cu appears nowhere else.</p>
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<p class="endnote">The function Modules::new appears nowhere else.</p>
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<p class="inwebparagraph"><a id="SP2_1"></a><b>§2.1. </b>Here we must find a unique name, valid as an Inter identifier: the code
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compiled from the compilation module will go into a package of that name.
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</p>
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<p class="macrodefinition"><code class="display">
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<<span class="cwebmacrodefn">Compose a name for the module package this will lead to</span> <span class="cwebmacronumber">2.1</span>> =
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</code></p>
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<pre class="displaydefn">
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">Extensions::is_standard</span><span class="plain">(</span><span class="identifier">owner</span><span class="plain">)) </span><span class="identifier">WRITE_TO</span><span class="plain">(</span><span class="identifier">pname</span><span class="plain">, </span><span class="string">"standard_rules"</span><span class="plain">);</span>
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<span class="reserved">else</span><span class="plain"> </span><span class="reserved">if</span><span class="plain"> (</span><span class="identifier">owner</span><span class="plain"> == </span><span class="identifier">NULL</span><span class="plain">) </span><span class="identifier">WRITE_TO</span><span class="plain">(</span><span class="identifier">pname</span><span class="plain">, </span><span class="string">"source_text"</span><span class="plain">);</span>
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<span class="reserved">else</span><span class="plain"> {</span>
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<span class="identifier">WRITE_TO</span><span class="plain">(</span><span class="identifier">pname</span><span class="plain">, </span><span class="string">"%X"</span><span class="plain">, </span><span class="identifier">owner</span><span class="plain">-></span><span class="identifier">as_copy</span><span class="plain">-></span><span class="identifier">edition</span><span class="plain">-></span><span class="identifier">work</span><span class="plain">);</span>
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<span class="identifier">LOOP_THROUGH_TEXT</span><span class="plain">(</span><span class="identifier">pos</span><span class="plain">, </span><span class="identifier">pname</span><span class="plain">)</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">Str::get</span><span class="plain">(</span><span class="identifier">pos</span><span class="plain">) == </span><span class="character">' '</span><span class="plain">)</span>
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<span class="identifier">Str::put</span><span class="plain">(</span><span class="identifier">pos</span><span class="plain">, </span><span class="character">'_'</span><span class="plain">);</span>
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<span class="reserved">else</span>
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<span class="identifier">Str::put</span><span class="plain">(</span><span class="identifier">pos</span><span class="plain">, </span><span class="identifier">Characters::tolower</span><span class="plain">(</span><span class="identifier">Str::get</span><span class="plain">(</span><span class="identifier">pos</span><span class="plain">)));</span>
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<span class="plain">}</span>
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</pre>
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<p class="inwebparagraph"></p>
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<p class="endnote">This code is used in <a href="#SP2">§2</a>.</p>
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<p class="inwebparagraph"><a id="SP3"></a><b>§3. </b>We are eventually going to need to be able to look at a given node in the parse
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tree and say which compilation module it belongs to. If there were a fast way
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to go up in the tree, that would be easy — we could simply run upward until we
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reach a level-0 heading. But the node links all run downwards. Instead, we'll
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"mark" nodes in the tree, annotating them with the compilation module which owns
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them. This is done by "propagating downwards", as follows.
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</p>
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<p class="inwebparagraph"><a id="SP4"></a><b>§4. </b></p>
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<pre class="display">
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<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">Modules::propagate_downwards</span><span class="plain">(</span><span class="identifier">parse_node</span><span class="plain"> *</span><span class="identifier">P</span><span class="plain">, </span><span class="identifier">compilation_module</span><span class="plain"> *</span><span class="identifier">C</span><span class="plain">) {</span>
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<span class="reserved">while</span><span class="plain"> (</span><span class="identifier">P</span><span class="plain">) {</span>
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<span class="identifier">ParseTree::set_module</span><span class="plain">(</span><span class="identifier">P</span><span class="plain">, </span><span class="identifier">C</span><span class="plain">);</span>
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<span class="functiontext">Modules::propagate_downwards</span><span class="plain">(</span><span class="identifier">P</span><span class="plain">-></span><span class="element">down</span><span class="plain">, </span><span class="identifier">C</span><span class="plain">);</span>
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<span class="identifier">P</span><span class="plain"> = </span><span class="identifier">P</span><span class="plain">-></span><span class="element">next</span><span class="plain">;</span>
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<span class="plain">}</span>
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<span class="plain">}</span>
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</pre>
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<p class="inwebparagraph"></p>
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<p class="endnote">The function Modules::propagate_downwards is used in <a href="#SP2">§2</a>.</p>
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<p class="inwebparagraph"><a id="SP5"></a><b>§5. </b>As promised, then, given a parse node, we have to return its compilation module:
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but that's now easy, as we just have to read off the annotation made above —
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</p>
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<pre class="display">
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<span class="identifier">compilation_module</span><span class="plain"> *</span><span class="functiontext">Modules::find</span><span class="plain">(</span><span class="identifier">parse_node</span><span class="plain"> *</span><span class="identifier">from</span><span class="plain">) {</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">from</span><span class="plain"> == </span><span class="identifier">NULL</span><span class="plain">) </span><span class="reserved">return</span><span class="plain"> </span><span class="identifier">NULL</span><span class="plain">;</span>
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<span class="reserved">return</span><span class="plain"> </span><span class="identifier">ParseTree::get_module</span><span class="plain">(</span><span class="identifier">from</span><span class="plain">);</span>
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<span class="plain">}</span>
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</pre>
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<p class="inwebparagraph"></p>
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<p class="endnote">The function Modules::find is used in <a href="#SP6">§6</a>, 5/nv (<a href="5-nv.html#SP16">§16</a>), 6/bp (<a href="6-bp.html#SP31">§31</a>), 15/pr (<a href="15-pr.html#SP5_3">§5.3</a>), 19/tb (<a href="19-tb.html#SP9">§9</a>), 21/rl (<a href="21-rl.html#SP26">§26</a>), 22/ph (<a href="22-ph.html#SP6_8">§6.8</a>), 22/tp (<a href="22-tp.html#SP7">§7</a>), 27/hr (<a href="27-hr.html#SP4">§4</a>).</p>
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<p class="inwebparagraph"><a id="SP6"></a><b>§6. Current module. </b>Inform has a concept of the "current module" it's working on, much as it has
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a concept of "current sentence".
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</p>
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<pre class="display">
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<span class="identifier">compilation_module</span><span class="plain"> *</span><span class="identifier">current_CM</span><span class="plain"> = </span><span class="identifier">NULL</span><span class="plain">;</span>
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<span class="identifier">compilation_module</span><span class="plain"> *</span><span class="functiontext">Modules::current</span><span class="plain">(</span><span class="reserved">void</span><span class="plain">) {</span>
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<span class="reserved">return</span><span class="plain"> </span><span class="identifier">current_CM</span><span class="plain">;</span>
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<span class="plain">}</span>
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<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">Modules::set_current_to</span><span class="plain">(</span><span class="identifier">compilation_module</span><span class="plain"> *</span><span class="identifier">CM</span><span class="plain">) {</span>
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<span class="identifier">current_CM</span><span class="plain"> = </span><span class="identifier">CM</span><span class="plain">;</span>
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<span class="plain">}</span>
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<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">Modules::set_current</span><span class="plain">(</span><span class="identifier">parse_node</span><span class="plain"> *</span><span class="identifier">P</span><span class="plain">) {</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">P</span><span class="plain">) </span><span class="identifier">current_CM</span><span class="plain"> = </span><span class="functiontext">Modules::find</span><span class="plain">(</span><span class="identifier">P</span><span class="plain">);</span>
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<span class="reserved">else</span><span class="plain"> </span><span class="identifier">current_CM</span><span class="plain"> = </span><span class="identifier">NULL</span><span class="plain">;</span>
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<span class="plain">}</span>
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</pre>
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<p class="inwebparagraph"></p>
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<p class="endnote">The function Modules::current is used in 9/tfa (<a href="9-tfa.html#SP7_2">§7.2</a>), 15/ma (<a href="15-ma.html#SP11_3">§11.3</a>), 17/ts (<a href="17-ts.html#SP5">§5</a>, <a href="17-ts.html#SP11_1">§11.1</a>), 22/tp (<a href="22-tp.html#SP7">§7</a>), 23/ad (<a href="23-ad.html#SP5">§5</a>), 26/jl (<a href="26-jl.html#SP4">§4</a>).</p>
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<p class="endnote">The function Modules::set_current_to is used in 9/tfa (<a href="9-tfa.html#SP7_2">§7.2</a>), 17/ts (<a href="17-ts.html#SP11_1">§11.1</a>), 23/ad (<a href="23-ad.html#SP5">§5</a>).</p>
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<p class="endnote">The function Modules::set_current is used in 9/tfa (<a href="9-tfa.html#SP7_2">§7.2</a>), 23/ad (<a href="23-ad.html#SP5">§5</a>), 25/cp (<a href="25-cp.html#SP3">§3</a>).</p>
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<p class="inwebparagraph"><a id="SP7"></a><b>§7. Relating to Inter. </b>Creating the necessary package, of type <code class="display"><span class="extract">_module</span></code>, is the work of the
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Packaging code.
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</p>
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<pre class="display">
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<span class="identifier">module_package</span><span class="plain"> *</span><span class="functiontext">Modules::inter_presence</span><span class="plain">(</span><span class="identifier">compilation_module</span><span class="plain"> *</span><span class="identifier">C</span><span class="plain">) {</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">C</span><span class="plain"> == </span><span class="identifier">NULL</span><span class="plain">) </span><span class="identifier">internal_error</span><span class="plain">(</span><span class="string">"no module"</span><span class="plain">);</span>
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<span class="reserved">return</span><span class="plain"> </span><span class="identifier">C</span><span class="plain">-></span><span class="identifier">inter_presence</span><span class="plain">;</span>
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<span class="plain">}</span>
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</pre>
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<p class="inwebparagraph"></p>
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<p class="endnote">The function Modules::inter_presence appears nowhere else.</p>
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