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Graham Nelson 7cafd5bca2 Linking of functions
2020-04-11 21:39:43 +01:00

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>Patterns</title>
<meta name="viewport" content="width=device-width initial-scale=1">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta http-equiv="Content-Language" content="en-gb">
<link href="../inweb.css" rel="stylesheet" rev="stylesheet" type="text/css">
</head>
<body>
<nav role="navigation">
<h1><a href="../webs.html">Sources</a></h1>
<ul>
<li><a href="../inweb/index.html">inweb</a></li>
</ul>
<h2>Foundation</h2>
<ul>
<li><a href="../foundation-module/index.html">foundation-module</a></li>
<li><a href="../foundation-test/index.html">foundation-test</a></li>
</ul>
</nav>
<main role="main">
<!--Weave of 'Patterns' generated by 7-->
<ul class="crumbs"><li><a href="../webs.html">Source</a></li><li><a href="index.html">inweb</a></li><li><a href="index.html#1">Chapter 1: Top Level</a></li><li><b>Patterns</b></li></ul><p class="purpose">Managing weave patterns, which are bundled configuration settings for weaving.</p>
<ul class="toc"><li><a href="#SP1">&#167;1. Reading in</a></li><li><a href="#SP5">&#167;5. Obtaining files</a></li></ul><hr class="tocbar">
<p class="inwebparagraph"><a id="SP1"></a><b>&#167;1. Reading in. </b>Patterns are stored as directories in the file system, and are identified by
names such as <code class="display"><span class="extract">HTML</span></code>. On request, we need to find the directory corresponding
to such a name, and to read it in. This structure holds the result:
</p>
<pre class="display">
<span class="reserved">typedef</span><span class="plain"> </span><span class="reserved">struct</span><span class="plain"> </span><span class="reserved">weave_pattern</span><span class="plain"> {</span>
<span class="reserved">struct</span><span class="plain"> </span><span class="reserved">text_stream</span><span class="plain"> *</span><span class="identifier">pattern_name</span><span class="plain">; </span><span class="comment"> such as <code class="display"><span class="extract">HTML</span></code></span>
<span class="reserved">struct</span><span class="plain"> </span><span class="reserved">pathname</span><span class="plain"> *</span><span class="identifier">pattern_location</span><span class="plain">; </span><span class="comment"> the directory</span>
<span class="reserved">struct</span><span class="plain"> </span><span class="reserved">weave_pattern</span><span class="plain"> *</span><span class="identifier">based_on</span><span class="plain">; </span><span class="comment"> inherit from which other pattern?</span>
<span class="reserved">struct</span><span class="plain"> </span><span class="reserved">weave_format</span><span class="plain"> *</span><span class="identifier">pattern_format</span><span class="plain">; </span><span class="comment"> such as <code class="display"><span class="extract">DVI</span></code>: the desired final format</span>
<span class="reserved">struct</span><span class="plain"> </span><span class="reserved">linked_list</span><span class="plain"> *</span><span class="identifier">plugins</span><span class="plain">; </span><span class="comment"> of <code class="display"><span class="extract">weave_plugin</span></code>: any extras needed</span>
<span class="reserved">struct</span><span class="plain"> </span><span class="reserved">linked_list</span><span class="plain"> *</span><span class="identifier">payloads</span><span class="plain">; </span><span class="comment"> of <code class="display"><span class="extract">text_stream</span></code>: leafnames of associated files</span>
<span class="reserved">struct</span><span class="plain"> </span><span class="reserved">linked_list</span><span class="plain"> *</span><span class="identifier">up_payloads</span><span class="plain">; </span><span class="comment"> of <code class="display"><span class="extract">text_stream</span></code>: leafnames of associated files</span>
<span class="reserved">struct</span><span class="plain"> </span><span class="reserved">text_stream</span><span class="plain"> *</span><span class="identifier">tex_command</span><span class="plain">; </span><span class="comment"> shell command to use for <code class="display"><span class="extract">tex</span></code></span>
<span class="reserved">struct</span><span class="plain"> </span><span class="reserved">text_stream</span><span class="plain"> *</span><span class="identifier">pdftex_command</span><span class="plain">; </span><span class="comment"> shell command to use for <code class="display"><span class="extract">pdftex</span></code></span>
<span class="reserved">struct</span><span class="plain"> </span><span class="reserved">text_stream</span><span class="plain"> *</span><span class="identifier">open_command</span><span class="plain">; </span><span class="comment"> shell command to use for <code class="display"><span class="extract">open</span></code></span>
<span class="reserved">int</span><span class="plain"> </span><span class="identifier">embed_CSS</span><span class="plain">; </span><span class="comment"> embed CSS directly into any HTML files made?</span>
<span class="reserved">int</span><span class="plain"> </span><span class="identifier">hierarchical</span><span class="plain">; </span><span class="comment"> weave as one part of a collection of woven webs</span>
<span class="reserved">int</span><span class="plain"> </span><span class="identifier">show_abbrevs</span><span class="plain">; </span><span class="comment"> show section range abbreviations in the weave?</span>
<span class="reserved">int</span><span class="plain"> </span><span class="identifier">number_sections</span><span class="plain">; </span><span class="comment"> insert section numbers into the weave?</span>
<span class="reserved">struct</span><span class="plain"> </span><span class="reserved">text_stream</span><span class="plain"> *</span><span class="identifier">default_range</span><span class="plain">; </span><span class="comment"> for example, <code class="display"><span class="extract">sections</span></code></span>
<span class="reserved">struct</span><span class="plain"> </span><span class="reserved">web</span><span class="plain"> *</span><span class="identifier">patterned_for</span><span class="plain">; </span><span class="comment"> the web which caused this to be read in</span>
<span class="constant">MEMORY_MANAGEMENT</span>
<span class="plain">} </span><span class="reserved">weave_pattern</span><span class="plain">;</span>
</pre>
<p class="inwebparagraph"></p>
<p class="endnote">The structure weave_pattern is accessed in 1/pc, 3/ts, 3/ti, 3/tw, 5/fm, 5/tf, 5/hf, 5/rtt and here.</p>
<p class="inwebparagraph"><a id="SP2"></a><b>&#167;2. </b>When a given web needs a pattern with a given name, this is where it comes.
</p>
<pre class="display">
<span class="reserved">weave_pattern</span><span class="plain"> *</span><span class="functiontext">Patterns::find<button class="popup" onclick="togglePopup('usagePopup9')">...<span class="popuptext" id="usagePopup9">Usage of <b>Patterns::find</b>:<br><a href="#SP3_1">&#167;3.1</a>, Program Control - <a href="1-pc.html#SP7_4_3">&#167;7.4.3</a></span></button></span><span class="reserved">web</span><span class="plain"> *</span><span class="identifier">W</span><span class="plain">, </span><span class="reserved">text_stream</span><span class="plain"> *</span><span class="identifier">name</span><span class="plain">) {</span>
<span class="reserved">filename</span><span class="plain"> *</span><span class="identifier">pattern_file</span><span class="plain"> = </span><span class="identifier">NULL</span><span class="plain">;</span>
<span class="reserved">weave_pattern</span><span class="plain"> *</span><span class="identifier">wp</span><span class="plain"> = </span><span class="identifier">CREATE</span><span class="plain">(</span><span class="reserved">weave_pattern</span><span class="plain">);</span>
&lt;<span class="cwebmacro">Initialise the pattern structure</span> <span class="cwebmacronumber">2.1</span>&gt;<span class="plain">;</span>
&lt;<span class="cwebmacro">Locate the pattern directory</span> <span class="cwebmacronumber">2.2</span>&gt;<span class="plain">;</span>
&lt;<span class="cwebmacro">Read in the pattern.txt file</span> <span class="cwebmacronumber">2.3</span>&gt;<span class="plain">;</span>
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">wp</span><span class="plain">;</span>
<span class="plain">}</span>
</pre>
<p class="inwebparagraph"></p>
<p class="inwebparagraph"><a id="SP2_1"></a><b>&#167;2.1. </b><code class="display">
&lt;<span class="cwebmacrodefn">Initialise the pattern structure</span> <span class="cwebmacronumber">2.1</span>&gt; =
</code></p>
<pre class="displaydefn">
<span class="identifier">wp</span><span class="plain">-&gt;</span><span class="element">pattern_name</span><span class="plain"> = </span><span class="functiontext"><a href="4-sm.html#SP3">Str::duplicate</a></span><span class="identifier">name</span><span class="plain">);</span>
<span class="identifier">wp</span><span class="plain">-&gt;</span><span class="element">pattern_location</span><span class="plain"> = </span><span class="identifier">NULL</span><span class="plain">;</span>
<span class="identifier">wp</span><span class="plain">-&gt;</span><span class="element">plugins</span><span class="plain"> = </span><span class="identifier">NEW_LINKED_LIST</span><span class="plain">(</span><span class="reserved">weave_plugin</span><span class="plain">);</span>
<span class="identifier">wp</span><span class="plain">-&gt;</span><span class="element">payloads</span><span class="plain"> = </span><span class="identifier">NEW_LINKED_LIST</span><span class="plain">(</span><span class="reserved">text_stream</span><span class="plain">);</span>
<span class="identifier">wp</span><span class="plain">-&gt;</span><span class="element">up_payloads</span><span class="plain"> = </span><span class="identifier">NEW_LINKED_LIST</span><span class="plain">(</span><span class="reserved">text_stream</span><span class="plain">);</span>
<span class="identifier">wp</span><span class="plain">-&gt;</span><span class="element">based_on</span><span class="plain"> = </span><span class="identifier">NULL</span><span class="plain">;</span>
<span class="identifier">wp</span><span class="plain">-&gt;</span><span class="element">embed_CSS</span><span class="plain"> = </span><span class="constant">FALSE</span><span class="plain">;</span>
<span class="identifier">wp</span><span class="plain">-&gt;</span><span class="element">hierarchical</span><span class="plain"> = </span><span class="constant">FALSE</span><span class="plain">;</span>
<span class="identifier">wp</span><span class="plain">-&gt;</span><span class="element">patterned_for</span><span class="plain"> = </span><span class="identifier">W</span><span class="plain">;</span>
<span class="identifier">wp</span><span class="plain">-&gt;</span><span class="element">show_abbrevs</span><span class="plain"> = </span><span class="constant">TRUE</span><span class="plain">;</span>
<span class="identifier">wp</span><span class="plain">-&gt;</span><span class="element">number_sections</span><span class="plain"> = </span><span class="constant">FALSE</span><span class="plain">;</span>
<span class="identifier">wp</span><span class="plain">-&gt;</span><span class="element">default_range</span><span class="plain"> = </span><span class="functiontext"><a href="4-sm.html#SP3">Str::duplicate</a></span><span class="identifier">I</span><span class="string">"0"</span><span class="plain">);</span>
<span class="identifier">wp</span><span class="plain">-&gt;</span><span class="element">tex_command</span><span class="plain"> = </span><span class="functiontext"><a href="4-sm.html#SP3">Str::duplicate</a></span><span class="identifier">I</span><span class="string">"tex"</span><span class="plain">);</span>
<span class="identifier">wp</span><span class="plain">-&gt;</span><span class="element">pdftex_command</span><span class="plain"> = </span><span class="functiontext"><a href="4-sm.html#SP3">Str::duplicate</a></span><span class="identifier">I</span><span class="string">"pdftex"</span><span class="plain">);</span>
<span class="identifier">wp</span><span class="plain">-&gt;</span><span class="element">open_command</span><span class="plain"> = </span><span class="functiontext"><a href="4-sm.html#SP3">Str::duplicate</a></span><span class="identifier">I</span><span class="string">"open"</span><span class="plain">);</span>
</pre>
<p class="inwebparagraph"></p>
<p class="endnote">This code is used in <a href="#SP2">&#167;2</a>.</p>
<p class="inwebparagraph"><a id="SP2_2"></a><b>&#167;2.2. </b><code class="display">
&lt;<span class="cwebmacrodefn">Locate the pattern directory</span> <span class="cwebmacronumber">2.2</span>&gt; =
</code></p>
<pre class="displaydefn">
<span class="identifier">wp</span><span class="plain">-&gt;</span><span class="element">pattern_location</span><span class="plain"> =</span>
<span class="functiontext"><a href="3-pth.html#SP4">Pathnames::subfolder</a></span>
<span class="functiontext"><a href="3-pth.html#SP4">Pathnames::subfolder</a></span><span class="identifier">W</span><span class="plain">-&gt;</span><span class="element">md</span><span class="plain">-&gt;</span><span class="element">path_to_web</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"Patterns"</span><span class="plain">),</span>
<span class="identifier">name</span><span class="plain">);</span>
<span class="identifier">pattern_file</span><span class="plain"> = </span><span class="functiontext"><a href="3-fln.html#SP2">Filenames::in_folder</a></span><span class="identifier">wp</span><span class="plain">-&gt;</span><span class="element">pattern_location</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"pattern.txt"</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="functiontext"><a href="4-tf.html#SP1">TextFiles::exists</a></span><span class="identifier">pattern_file</span><span class="plain">) == </span><span class="constant">FALSE</span><span class="plain">) {</span>
<span class="identifier">wp</span><span class="plain">-&gt;</span><span class="element">pattern_location</span><span class="plain"> = </span><span class="functiontext"><a href="3-pth.html#SP4">Pathnames::subfolder</a></span><span class="identifier">path_to_inweb_patterns</span><span class="plain">, </span><span class="identifier">name</span><span class="plain">);</span>
<span class="identifier">pattern_file</span><span class="plain"> = </span><span class="functiontext"><a href="3-fln.html#SP2">Filenames::in_folder</a></span><span class="identifier">wp</span><span class="plain">-&gt;</span><span class="element">pattern_location</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"pattern.txt"</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="functiontext"><a href="4-tf.html#SP1">TextFiles::exists</a></span><span class="identifier">pattern_file</span><span class="plain">) == </span><span class="constant">FALSE</span><span class="plain">)</span>
<span class="functiontext"><a href="3-em.html#SP2">Errors::fatal_with_text</a></span><span class="string">"no such weave pattern as '%S'"</span><span class="plain">, </span><span class="identifier">name</span><span class="plain">);</span>
<span class="plain">}</span>
</pre>
<p class="inwebparagraph"></p>
<p class="endnote">This code is used in <a href="#SP2">&#167;2</a>.</p>
<p class="inwebparagraph"><a id="SP2_3"></a><b>&#167;2.3. </b><code class="display">
&lt;<span class="cwebmacrodefn">Read in the pattern.txt file</span> <span class="cwebmacronumber">2.3</span>&gt; =
</code></p>
<pre class="displaydefn">
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">pattern_file</span><span class="plain">)</span>
<span class="functiontext"><a href="4-tf.html#SP5">TextFiles::read</a></span><span class="identifier">pattern_file</span><span class="plain">, </span><span class="constant">FALSE</span><span class="plain">, </span><span class="string">"can't open pattern.txt file"</span><span class="plain">,</span>
<span class="constant">TRUE</span><span class="plain">, </span><span class="functiontext"><a href="#SP3">Patterns::scan_pattern_line</a></span><span class="plain"> </span><span class="identifier">NULL</span><span class="plain">, </span><span class="identifier">wp</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">wp</span><span class="plain">-&gt;</span><span class="element">pattern_format</span><span class="plain"> == </span><span class="identifier">NULL</span><span class="plain">)</span>
<span class="functiontext"><a href="3-em.html#SP2">Errors::fatal_with_text</a></span><span class="string">"pattern did not specify a format"</span><span class="plain">, </span><span class="identifier">name</span><span class="plain">);</span>
</pre>
<p class="inwebparagraph"></p>
<p class="endnote">This code is used in <a href="#SP2">&#167;2</a>.</p>
<p class="inwebparagraph"><a id="SP3"></a><b>&#167;3. </b>The Foundation module provides a standard way to scan text files line by
line, and this is used to send each line in the <code class="display"><span class="extract">pattern.txt</span></code> file to the
following routine:
</p>
<pre class="display">
<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">Patterns::scan_pattern_line<button class="popup" onclick="togglePopup('usagePopup10')">...<span class="popuptext" id="usagePopup10">Usage of <b>Patterns::scan_pattern_line</b>:<br><a href="#SP2_3">&#167;2.3</a></span></button></span><span class="reserved">text_stream</span><span class="plain"> *</span><span class="identifier">line</span><span class="plain">, </span><span class="reserved">text_file_position</span><span class="plain"> *</span><span class="identifier">tfp</span><span class="plain">, </span><span class="reserved">void</span><span class="plain"> *</span><span class="identifier">X</span><span class="plain">) {</span>
<span class="reserved">weave_pattern</span><span class="plain"> *</span><span class="identifier">wp</span><span class="plain"> = (</span><span class="reserved">weave_pattern</span><span class="plain"> *) </span><span class="identifier">X</span><span class="plain">;</span>
<span class="reserved">match_results</span><span class="plain"> </span><span class="identifier">mr</span><span class="plain"> = </span><span class="functiontext"><a href="4-pm.html#SP9">Regexp::create_mr</a></span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="functiontext"><a href="4-pm.html#SP10">Regexp::match</a></span><span class="plain">&amp;</span><span class="identifier">mr</span><span class="plain">, </span><span class="identifier">line</span><span class="plain">, </span><span class="identifier">L</span><span class="string">" *from (%c+)"</span><span class="plain">)) </span>&lt;<span class="cwebmacro">This is a from command</span> <span class="cwebmacronumber">3.1</span>&gt;<span class="plain">;</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="functiontext"><a href="4-pm.html#SP10">Regexp::match</a></span><span class="plain">&amp;</span><span class="identifier">mr</span><span class="plain">, </span><span class="identifier">line</span><span class="plain">, </span><span class="identifier">L</span><span class="string">" *(%c+?) = (%c+)"</span><span class="plain">)) </span>&lt;<span class="cwebmacro">This is an X = Y command</span> <span class="cwebmacronumber">3.2</span>&gt;<span class="plain">;</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="functiontext"><a href="4-pm.html#SP10">Regexp::match</a></span><span class="plain">&amp;</span><span class="identifier">mr</span><span class="plain">, </span><span class="identifier">line</span><span class="plain">, </span><span class="identifier">L</span><span class="string">" *embed css *"</span><span class="plain">)) </span>&lt;<span class="cwebmacro">This is an embed CSS command</span> <span class="cwebmacronumber">3.3</span>&gt;<span class="plain">;</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="functiontext"><a href="4-pm.html#SP10">Regexp::match</a></span><span class="plain">&amp;</span><span class="identifier">mr</span><span class="plain">, </span><span class="identifier">line</span><span class="plain">, </span><span class="identifier">L</span><span class="string">" *hierarchical *"</span><span class="plain">)) </span>&lt;<span class="cwebmacro">This is a hierarchical command</span> <span class="cwebmacronumber">3.4</span>&gt;<span class="plain">;</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="functiontext"><a href="4-pm.html#SP10">Regexp::match</a></span><span class="plain">&amp;</span><span class="identifier">mr</span><span class="plain">, </span><span class="identifier">line</span><span class="plain">, </span><span class="identifier">L</span><span class="string">" *plugin (%c+)"</span><span class="plain">)) </span>&lt;<span class="cwebmacro">This is a plugin command</span> <span class="cwebmacronumber">3.5</span>&gt;<span class="plain">;</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="functiontext"><a href="4-pm.html#SP10">Regexp::match</a></span><span class="plain">&amp;</span><span class="identifier">mr</span><span class="plain">, </span><span class="identifier">line</span><span class="plain">, </span><span class="identifier">L</span><span class="string">" *use (%c+)"</span><span class="plain">)) </span>&lt;<span class="cwebmacro">This is a use command</span> <span class="cwebmacronumber">3.6</span>&gt;<span class="plain">;</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="functiontext"><a href="4-pm.html#SP10">Regexp::match</a></span><span class="plain">&amp;</span><span class="identifier">mr</span><span class="plain">, </span><span class="identifier">line</span><span class="plain">, </span><span class="identifier">L</span><span class="string">" *use-up (%c+)"</span><span class="plain">)) </span>&lt;<span class="cwebmacro">This is a use-up command</span> <span class="cwebmacronumber">3.7</span>&gt;<span class="plain">;</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="functiontext"><a href="4-pm.html#SP10">Regexp::match</a></span><span class="plain">&amp;</span><span class="identifier">mr</span><span class="plain">, </span><span class="identifier">line</span><span class="plain">, </span><span class="identifier">L</span><span class="string">" *%C%c*"</span><span class="plain">))</span>
<span class="functiontext"><a href="3-em.html#SP5">Errors::in_text_file</a></span><span class="string">"unrecognised pattern command"</span><span class="plain">, </span><span class="identifier">tfp</span><span class="plain">);</span>
<span class="functiontext"><a href="4-pm.html#SP9">Regexp::dispose_of</a></span><span class="plain">&amp;</span><span class="identifier">mr</span><span class="plain">);</span>
<span class="plain">}</span>
</pre>
<p class="inwebparagraph"></p>
<p class="inwebparagraph"><a id="SP3_1"></a><b>&#167;3.1. </b><code class="display">
&lt;<span class="cwebmacrodefn">This is a from command</span> <span class="cwebmacronumber">3.1</span>&gt; =
</code></p>
<pre class="displaydefn">
<span class="identifier">wp</span><span class="plain">-&gt;</span><span class="element">based_on</span><span class="plain"> = </span><span class="functiontext"><a href="#SP2">Patterns::find</a></span><span class="identifier">wp</span><span class="plain">-&gt;</span><span class="element">patterned_for</span><span class="plain">, </span><span class="identifier">mr</span><span class="plain">.</span><span class="element">exp</span><span class="plain">[0]);</span>
<span class="functiontext"><a href="4-pm.html#SP9">Regexp::dispose_of</a></span><span class="plain">&amp;</span><span class="identifier">mr</span><span class="plain">);</span>
<span class="reserved">return</span><span class="plain">;</span>
</pre>
<p class="inwebparagraph"></p>
<p class="endnote">This code is used in <a href="#SP3">&#167;3</a>.</p>
<p class="inwebparagraph"><a id="SP3_2"></a><b>&#167;3.2. </b><code class="display">
&lt;<span class="cwebmacrodefn">This is an X = Y command</span> <span class="cwebmacronumber">3.2</span>&gt; =
</code></p>
<pre class="displaydefn">
<span class="reserved">if</span><span class="plain"> (</span><span class="functiontext"><a href="4-sm.html#SP18">Str::eq</a></span><span class="identifier">mr</span><span class="plain">.</span><span class="element">exp</span><span class="plain">[0], </span><span class="identifier">I</span><span class="string">"format"</span><span class="plain">)) {</span>
<span class="identifier">wp</span><span class="plain">-&gt;</span><span class="element">pattern_format</span><span class="plain"> = </span><span class="functiontext"><a href="5-fm.html#SP1">Formats::find_by_name</a></span><span class="identifier">mr</span><span class="plain">.</span><span class="element">exp</span><span class="plain">[1]);</span>
<span class="plain">} </span><span class="reserved">else</span><span class="plain"> </span><span class="reserved">if</span><span class="plain"> (</span><span class="functiontext"><a href="4-sm.html#SP18">Str::eq</a></span><span class="identifier">mr</span><span class="plain">.</span><span class="element">exp</span><span class="plain">[0], </span><span class="identifier">I</span><span class="string">"abbrevs"</span><span class="plain">)) {</span>
<span class="identifier">wp</span><span class="plain">-&gt;</span><span class="element">show_abbrevs</span><span class="plain"> = </span><span class="functiontext"><a href="#SP4">Patterns::yes_or_no</a></span><span class="identifier">mr</span><span class="plain">.</span><span class="element">exp</span><span class="plain">[1], </span><span class="identifier">tfp</span><span class="plain">);</span>
<span class="plain">} </span><span class="reserved">else</span><span class="plain"> </span><span class="reserved">if</span><span class="plain"> (</span><span class="functiontext"><a href="4-sm.html#SP18">Str::eq</a></span><span class="identifier">mr</span><span class="plain">.</span><span class="element">exp</span><span class="plain">[0], </span><span class="identifier">I</span><span class="string">"numbered"</span><span class="plain">)) {</span>
<span class="identifier">wp</span><span class="plain">-&gt;</span><span class="element">number_sections</span><span class="plain"> = </span><span class="functiontext"><a href="#SP4">Patterns::yes_or_no</a></span><span class="identifier">mr</span><span class="plain">.</span><span class="element">exp</span><span class="plain">[1], </span><span class="identifier">tfp</span><span class="plain">);</span>
<span class="plain">} </span><span class="reserved">else</span><span class="plain"> </span><span class="reserved">if</span><span class="plain"> (</span><span class="functiontext"><a href="4-sm.html#SP18">Str::eq</a></span><span class="identifier">mr</span><span class="plain">.</span><span class="element">exp</span><span class="plain">[0], </span><span class="identifier">I</span><span class="string">"default-range"</span><span class="plain">)) {</span>
<span class="identifier">wp</span><span class="plain">-&gt;</span><span class="element">default_range</span><span class="plain"> = </span><span class="functiontext"><a href="4-sm.html#SP3">Str::duplicate</a></span><span class="identifier">mr</span><span class="plain">.</span><span class="element">exp</span><span class="plain">[1]);</span>
<span class="plain">} </span><span class="reserved">else</span><span class="plain"> </span><span class="reserved">if</span><span class="plain"> (</span><span class="functiontext"><a href="4-sm.html#SP18">Str::eq</a></span><span class="identifier">mr</span><span class="plain">.</span><span class="element">exp</span><span class="plain">[0], </span><span class="identifier">I</span><span class="string">"tex-command"</span><span class="plain">)) {</span>
<span class="identifier">wp</span><span class="plain">-&gt;</span><span class="element">tex_command</span><span class="plain"> = </span><span class="functiontext"><a href="4-sm.html#SP3">Str::duplicate</a></span><span class="identifier">mr</span><span class="plain">.</span><span class="element">exp</span><span class="plain">[1]);</span>
<span class="plain">} </span><span class="reserved">else</span><span class="plain"> </span><span class="reserved">if</span><span class="plain"> (</span><span class="functiontext"><a href="4-sm.html#SP18">Str::eq</a></span><span class="identifier">mr</span><span class="plain">.</span><span class="element">exp</span><span class="plain">[0], </span><span class="identifier">I</span><span class="string">"pdftex-command"</span><span class="plain">)) {</span>
<span class="identifier">wp</span><span class="plain">-&gt;</span><span class="element">pdftex_command</span><span class="plain"> = </span><span class="functiontext"><a href="4-sm.html#SP3">Str::duplicate</a></span><span class="identifier">mr</span><span class="plain">.</span><span class="element">exp</span><span class="plain">[1]);</span>
<span class="plain">} </span><span class="reserved">else</span><span class="plain"> </span><span class="reserved">if</span><span class="plain"> (</span><span class="functiontext"><a href="4-sm.html#SP18">Str::eq</a></span><span class="identifier">mr</span><span class="plain">.</span><span class="element">exp</span><span class="plain">[0], </span><span class="identifier">I</span><span class="string">"open-command"</span><span class="plain">)) {</span>
<span class="identifier">wp</span><span class="plain">-&gt;</span><span class="element">open_command</span><span class="plain"> = </span><span class="functiontext"><a href="4-sm.html#SP3">Str::duplicate</a></span><span class="identifier">mr</span><span class="plain">.</span><span class="element">exp</span><span class="plain">[1]);</span>
<span class="plain">} </span><span class="reserved">else</span><span class="plain"> </span><span class="reserved">if</span><span class="plain"> ((</span><span class="functiontext"><a href="8-bdfw.html#SP6">Bibliographic::data_exists</a></span><span class="identifier">wp</span><span class="plain">-&gt;</span><span class="element">patterned_for</span><span class="plain">-&gt;</span><span class="element">md</span><span class="plain">, </span><span class="identifier">mr</span><span class="plain">.</span><span class="element">exp</span><span class="plain">[0])) ||</span>
<span class="plain">(</span><span class="functiontext"><a href="4-sm.html#SP18">Str::eq</a></span><span class="identifier">mr</span><span class="plain">.</span><span class="element">exp</span><span class="plain">[0], </span><span class="identifier">I</span><span class="string">"Booklet Title"</span><span class="plain">))) {</span>
<span class="functiontext"><a href="8-bdfw.html#SP7">Bibliographic::set_datum</a></span><span class="identifier">wp</span><span class="plain">-&gt;</span><span class="element">patterned_for</span><span class="plain">-&gt;</span><span class="element">md</span><span class="plain">, </span><span class="identifier">mr</span><span class="plain">.</span><span class="element">exp</span><span class="plain">[0], </span><span class="identifier">mr</span><span class="plain">.</span><span class="element">exp</span><span class="plain">[1]);</span>
<span class="plain">} </span><span class="reserved">else</span><span class="plain"> {</span>
<span class="identifier">PRINT</span><span class="plain">(</span><span class="string">"Setting: %S\n"</span><span class="plain">, </span><span class="identifier">mr</span><span class="plain">.</span><span class="element">exp</span><span class="plain">[0]);</span>
<span class="functiontext"><a href="3-em.html#SP5">Errors::in_text_file</a></span><span class="string">"no such pattern setting"</span><span class="plain">, </span><span class="identifier">tfp</span><span class="plain">);</span>
<span class="plain">}</span>
<span class="functiontext"><a href="4-pm.html#SP9">Regexp::dispose_of</a></span><span class="plain">&amp;</span><span class="identifier">mr</span><span class="plain">);</span>
<span class="reserved">return</span><span class="plain">;</span>
</pre>
<p class="inwebparagraph"></p>
<p class="endnote">This code is used in <a href="#SP3">&#167;3</a>.</p>
<p class="inwebparagraph"><a id="SP3_3"></a><b>&#167;3.3. </b><code class="display">
&lt;<span class="cwebmacrodefn">This is an embed CSS command</span> <span class="cwebmacronumber">3.3</span>&gt; =
</code></p>
<pre class="displaydefn">
<span class="identifier">wp</span><span class="plain">-&gt;</span><span class="element">embed_CSS</span><span class="plain"> = </span><span class="constant">TRUE</span><span class="plain">;</span>
<span class="functiontext"><a href="4-pm.html#SP9">Regexp::dispose_of</a></span><span class="plain">&amp;</span><span class="identifier">mr</span><span class="plain">);</span>
<span class="reserved">return</span><span class="plain">;</span>
</pre>
<p class="inwebparagraph"></p>
<p class="endnote">This code is used in <a href="#SP3">&#167;3</a>.</p>
<p class="inwebparagraph"><a id="SP3_4"></a><b>&#167;3.4. </b><code class="display">
&lt;<span class="cwebmacrodefn">This is a hierarchical command</span> <span class="cwebmacronumber">3.4</span>&gt; =
</code></p>
<pre class="displaydefn">
<span class="identifier">wp</span><span class="plain">-&gt;</span><span class="element">hierarchical</span><span class="plain"> = </span><span class="constant">TRUE</span><span class="plain">;</span>
<span class="functiontext"><a href="4-pm.html#SP9">Regexp::dispose_of</a></span><span class="plain">&amp;</span><span class="identifier">mr</span><span class="plain">);</span>
<span class="reserved">return</span><span class="plain">;</span>
</pre>
<p class="inwebparagraph"></p>
<p class="endnote">This code is used in <a href="#SP3">&#167;3</a>.</p>
<p class="inwebparagraph"><a id="SP3_5"></a><b>&#167;3.5. </b>"Plugins" here refer to <a href="5-wp.html" class="internal">Weave Plugins</a>.
</p>
<p class="macrodefinition"><code class="display">
&lt;<span class="cwebmacrodefn">This is a plugin command</span> <span class="cwebmacronumber">3.5</span>&gt; =
</code></p>
<pre class="displaydefn">
<span class="reserved">text_stream</span><span class="plain"> *</span><span class="identifier">leafname</span><span class="plain"> = </span><span class="functiontext"><a href="4-sm.html#SP3">Str::duplicate</a></span><span class="identifier">mr</span><span class="plain">.</span><span class="element">exp</span><span class="plain">[0]);</span>
<span class="identifier">ADD_TO_LINKED_LIST</span><span class="plain">(</span><span class="identifier">leafname</span><span class="plain">, </span><span class="reserved">text_stream</span><span class="plain">, </span><span class="identifier">wp</span><span class="plain">-&gt;</span><span class="element">plugins</span><span class="plain">);</span>
<span class="functiontext"><a href="4-pm.html#SP9">Regexp::dispose_of</a></span><span class="plain">&amp;</span><span class="identifier">mr</span><span class="plain">);</span>
<span class="reserved">return</span><span class="plain">;</span>
</pre>
<p class="inwebparagraph"></p>
<p class="endnote">This code is used in <a href="#SP3">&#167;3</a>.</p>
<p class="inwebparagraph"><a id="SP3_6"></a><b>&#167;3.6. </b>"Payloads" are associated files such as images which may be needed for an
HTML weave to look right. We identify them here only by leafname: their
actual location will depend on where the pattern directory is.
</p>
<p class="macrodefinition"><code class="display">
&lt;<span class="cwebmacrodefn">This is a use command</span> <span class="cwebmacronumber">3.6</span>&gt; =
</code></p>
<pre class="displaydefn">
<span class="reserved">text_stream</span><span class="plain"> *</span><span class="identifier">leafname</span><span class="plain"> = </span><span class="functiontext"><a href="4-sm.html#SP3">Str::duplicate</a></span><span class="identifier">mr</span><span class="plain">.</span><span class="element">exp</span><span class="plain">[0]);</span>
<span class="identifier">ADD_TO_LINKED_LIST</span><span class="plain">(</span><span class="identifier">leafname</span><span class="plain">, </span><span class="reserved">text_stream</span><span class="plain">, </span><span class="identifier">wp</span><span class="plain">-&gt;</span><span class="element">payloads</span><span class="plain">);</span>
<span class="functiontext"><a href="4-pm.html#SP9">Regexp::dispose_of</a></span><span class="plain">&amp;</span><span class="identifier">mr</span><span class="plain">);</span>
<span class="reserved">return</span><span class="plain">;</span>
</pre>
<p class="inwebparagraph"></p>
<p class="endnote">This code is used in <a href="#SP3">&#167;3</a>.</p>
<p class="inwebparagraph"><a id="SP3_7"></a><b>&#167;3.7. </b><code class="display">
&lt;<span class="cwebmacrodefn">This is a use-up command</span> <span class="cwebmacronumber">3.7</span>&gt; =
</code></p>
<pre class="displaydefn">
<span class="reserved">text_stream</span><span class="plain"> *</span><span class="identifier">leafname</span><span class="plain"> = </span><span class="functiontext"><a href="4-sm.html#SP3">Str::duplicate</a></span><span class="identifier">mr</span><span class="plain">.</span><span class="element">exp</span><span class="plain">[0]);</span>
<span class="identifier">ADD_TO_LINKED_LIST</span><span class="plain">(</span><span class="identifier">leafname</span><span class="plain">, </span><span class="reserved">text_stream</span><span class="plain">, </span><span class="identifier">wp</span><span class="plain">-&gt;</span><span class="element">up_payloads</span><span class="plain">);</span>
<span class="functiontext"><a href="4-pm.html#SP9">Regexp::dispose_of</a></span><span class="plain">&amp;</span><span class="identifier">mr</span><span class="plain">);</span>
<span class="reserved">return</span><span class="plain">;</span>
</pre>
<p class="inwebparagraph"></p>
<p class="endnote">This code is used in <a href="#SP3">&#167;3</a>.</p>
<p class="inwebparagraph"><a id="SP4"></a><b>&#167;4. </b></p>
<pre class="display">
<span class="reserved">int</span><span class="plain"> </span><span class="functiontext">Patterns::yes_or_no<button class="popup" onclick="togglePopup('usagePopup11')">...<span class="popuptext" id="usagePopup11">Usage of <b>Patterns::yes_or_no</b>:<br><a href="#SP3_2">&#167;3.2</a></span></button></span><span class="reserved">text_stream</span><span class="plain"> *</span><span class="identifier">arg</span><span class="plain">, </span><span class="reserved">text_file_position</span><span class="plain"> *</span><span class="identifier">tfp</span><span class="plain">) {</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="functiontext"><a href="4-sm.html#SP18">Str::eq</a></span><span class="identifier">arg</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"yes"</span><span class="plain">)) </span><span class="reserved">return</span><span class="plain"> </span><span class="constant">TRUE</span><span class="plain">;</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="functiontext"><a href="4-sm.html#SP18">Str::eq</a></span><span class="identifier">arg</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"no"</span><span class="plain">)) </span><span class="reserved">return</span><span class="plain"> </span><span class="constant">FALSE</span><span class="plain">;</span>
<span class="functiontext"><a href="3-em.html#SP5">Errors::in_text_file</a></span><span class="string">"setting must be 'yes' or 'no'"</span><span class="plain">, </span><span class="identifier">tfp</span><span class="plain">);</span>
<span class="reserved">return</span><span class="plain"> </span><span class="constant">FALSE</span><span class="plain">;</span>
<span class="plain">}</span>
</pre>
<p class="inwebparagraph"></p>
<p class="inwebparagraph"><a id="SP5"></a><b>&#167;5. Obtaining files. </b>Patterns provide not merely some configuration settings (above): they also
provide template or style files of various kinds. When Inweb wants to find
a pattern file with a given leafname, it looks for it in the pattern
directory. If that fails, it then looks in the directory of the pattern
inherited from.
</p>
<p class="inwebparagraph">Note that if you're rash enough to set up a cycle of patterns inheriting
from each other then this routine will lock up into an infinite loop.
</p>
<pre class="display">
<span class="reserved">filename</span><span class="plain"> *</span><span class="functiontext">Patterns::obtain_filename<button class="popup" onclick="togglePopup('usagePopup12')">...<span class="popuptext" id="usagePopup12">Usage of <b>Patterns::obtain_filename</b>:<br><a href="#SP6">&#167;6</a>, The Swarm - <a href="3-ts.html#SP4">&#167;4</a><br>The Indexer - <a href="3-ti.html#SP1">&#167;1</a>, <a href="3-ti.html#SP2">&#167;2</a>, <a href="3-ti.html#SP2_1_3">&#167;2.1.3</a>, <a href="3-ti.html#SP5_1">&#167;5.1</a><br>TeX Format - <a href="5-tf.html#SP3_1">&#167;3.1</a><br>HTML Formats - <a href="5-hf.html#SP6">&#167;6</a>, <a href="5-hf.html#SP9">&#167;9</a>, <a href="5-hf.html#SP32">&#167;32</a></span></button></span><span class="reserved">weave_pattern</span><span class="plain"> *</span><span class="identifier">pattern</span><span class="plain">, </span><span class="reserved">text_stream</span><span class="plain"> *</span><span class="identifier">leafname</span><span class="plain">) {</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="functiontext"><a href="4-sm.html#SP20">Str::prefix_eq</a></span><span class="identifier">leafname</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"../"</span><span class="plain">, </span><span class="constant">3</span><span class="plain">)) {</span>
<span class="functiontext"><a href="4-sm.html#SP24">Str::delete_first_character</a></span><span class="identifier">leafname</span><span class="plain">);</span>
<span class="functiontext"><a href="4-sm.html#SP24">Str::delete_first_character</a></span><span class="identifier">leafname</span><span class="plain">);</span>
<span class="functiontext"><a href="4-sm.html#SP24">Str::delete_first_character</a></span><span class="identifier">leafname</span><span class="plain">);</span>
<span class="plain">}</span>
<span class="reserved">filename</span><span class="plain"> *</span><span class="identifier">F</span><span class="plain"> = </span><span class="functiontext"><a href="3-fln.html#SP2">Filenames::in_folder</a></span><span class="identifier">pattern</span><span class="plain">-&gt;</span><span class="element">pattern_location</span><span class="plain">, </span><span class="identifier">leafname</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="functiontext"><a href="4-tf.html#SP1">TextFiles::exists</a></span><span class="identifier">F</span><span class="plain">)) </span><span class="reserved">return</span><span class="plain"> </span><span class="identifier">F</span><span class="plain">;</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">pattern</span><span class="plain">-&gt;</span><span class="element">based_on</span><span class="plain">) </span><span class="reserved">return</span><span class="plain"> </span><span class="functiontext"><a href="#SP5">Patterns::obtain_filename</a></span><span class="identifier">pattern</span><span class="plain">-&gt;</span><span class="element">based_on</span><span class="plain">, </span><span class="identifier">leafname</span><span class="plain">);</span>
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">NULL</span><span class="plain">;</span>
<span class="plain">}</span>
</pre>
<p class="inwebparagraph"></p>
<p class="inwebparagraph"><a id="SP6"></a><b>&#167;6. </b>When we eventually want to deal with the <code class="display"><span class="extract">use P</span></code> commands, which call
for payloads to be copied into weave, we make good use of the above:
</p>
<pre class="display">
<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">Patterns::copy_payloads_into_weave<button class="popup" onclick="togglePopup('usagePopup13')">...<span class="popuptext" id="usagePopup13">Usage of <b>Patterns::copy_payloads_into_weave</b>:<br>The Swarm - <a href="3-ts.html#SP4">&#167;4</a></span></button></span><span class="reserved">web</span><span class="plain"> *</span><span class="identifier">W</span><span class="plain">, </span><span class="reserved">weave_pattern</span><span class="plain"> *</span><span class="identifier">pattern</span><span class="plain">) {</span>
<span class="reserved">text_stream</span><span class="plain"> *</span><span class="identifier">leafname</span><span class="plain">;</span>
<span class="identifier">LOOP_OVER_LINKED_LIST</span><span class="plain">(</span><span class="identifier">leafname</span><span class="plain">, </span><span class="reserved">text_stream</span><span class="plain">, </span><span class="identifier">pattern</span><span class="plain">-&gt;</span><span class="element">payloads</span><span class="plain">) {</span>
<span class="reserved">filename</span><span class="plain"> *</span><span class="identifier">F</span><span class="plain"> = </span><span class="functiontext"><a href="#SP5">Patterns::obtain_filename</a></span><span class="identifier">pattern</span><span class="plain">, </span><span class="identifier">leafname</span><span class="plain">);</span>
<span class="functiontext"><a href="#SP7">Patterns::copy_file_into_weave</a></span><span class="identifier">W</span><span class="plain">, </span><span class="identifier">F</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">W</span><span class="plain">-&gt;</span><span class="element">as_ebook</span><span class="plain">) {</span>
<span class="reserved">filename</span><span class="plain"> *</span><span class="identifier">rel</span><span class="plain"> = </span><span class="functiontext"><a href="3-fln.html#SP2">Filenames::in_folder</a></span><span class="identifier">NULL</span><span class="plain">, </span><span class="identifier">leafname</span><span class="plain">);</span>
<span class="functiontext"><a href="5-ee.html#SP5">Epub::note_image</a></span><span class="identifier">W</span><span class="plain">-&gt;</span><span class="element">as_ebook</span><span class="plain">, </span><span class="identifier">rel</span><span class="plain">);</span>
<span class="plain">}</span>
<span class="plain">}</span>
<span class="identifier">LOOP_OVER_LINKED_LIST</span><span class="plain">(</span><span class="identifier">leafname</span><span class="plain">, </span><span class="reserved">text_stream</span><span class="plain">, </span><span class="identifier">pattern</span><span class="plain">-&gt;</span><span class="element">up_payloads</span><span class="plain">) {</span>
<span class="reserved">filename</span><span class="plain"> *</span><span class="identifier">F</span><span class="plain"> = </span><span class="functiontext"><a href="#SP5">Patterns::obtain_filename</a></span><span class="identifier">pattern</span><span class="plain">, </span><span class="identifier">leafname</span><span class="plain">);</span>
<span class="functiontext"><a href="#SP7">Patterns::copy_up_file_into_weave</a></span><span class="identifier">W</span><span class="plain">, </span><span class="identifier">F</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">W</span><span class="plain">-&gt;</span><span class="element">as_ebook</span><span class="plain">) {</span>
<span class="reserved">filename</span><span class="plain"> *</span><span class="identifier">rel</span><span class="plain"> = </span><span class="functiontext"><a href="3-fln.html#SP2">Filenames::in_folder</a></span><span class="identifier">NULL</span><span class="plain">, </span><span class="identifier">leafname</span><span class="plain">);</span>
<span class="functiontext"><a href="5-ee.html#SP5">Epub::note_image</a></span><span class="identifier">W</span><span class="plain">-&gt;</span><span class="element">as_ebook</span><span class="plain">, </span><span class="identifier">rel</span><span class="plain">);</span>
<span class="plain">}</span>
<span class="plain">}</span>
<span class="plain">}</span>
</pre>
<p class="inwebparagraph"></p>
<p class="inwebparagraph"><a id="SP7"></a><b>&#167;7. </b></p>
<pre class="display">
<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">Patterns::copy_file_into_weave<button class="popup" onclick="togglePopup('usagePopup14')">...<span class="popuptext" id="usagePopup14">Usage of <b>Patterns::copy_file_into_weave</b>:<br><a href="#SP6">&#167;6</a>, HTML Formats - <a href="5-hf.html#SP6">&#167;6</a>, <a href="5-hf.html#SP9">&#167;9</a>, <a href="5-hf.html#SP19">&#167;19</a><br>Weave Plugins - <a href="5-wp.html#SP3">&#167;3</a></span></button></span><span class="reserved">web</span><span class="plain"> *</span><span class="identifier">W</span><span class="plain">, </span><span class="reserved">filename</span><span class="plain"> *</span><span class="identifier">F</span><span class="plain">) {</span>
<span class="reserved">pathname</span><span class="plain"> *</span><span class="identifier">H</span><span class="plain"> = </span><span class="identifier">W</span><span class="plain">-&gt;</span><span class="element">redirect_weaves_to</span><span class="plain">;</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">H</span><span class="plain"> == </span><span class="identifier">NULL</span><span class="plain">) </span><span class="identifier">H</span><span class="plain"> = </span><span class="functiontext"><a href="2-tr.html#SP7">Reader::woven_folder</a></span><span class="identifier">W</span><span class="plain">);</span>
<span class="functiontext"><a href="3-shl.html#SP3">Shell::copy</a></span><span class="identifier">F</span><span class="plain">, </span><span class="identifier">H</span><span class="plain">, </span><span class="string">""</span><span class="plain">);</span>
<span class="plain">}</span>
<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">Patterns::copy_up_file_into_weave<button class="popup" onclick="togglePopup('usagePopup15')">...<span class="popuptext" id="usagePopup15">Usage of <b>Patterns::copy_up_file_into_weave</b>:<br><a href="#SP6">&#167;6</a>, HTML Formats - <a href="5-hf.html#SP6">&#167;6</a>, <a href="5-hf.html#SP9">&#167;9</a></span></button></span><span class="reserved">web</span><span class="plain"> *</span><span class="identifier">W</span><span class="plain">, </span><span class="reserved">filename</span><span class="plain"> *</span><span class="identifier">F</span><span class="plain">) {</span>
<span class="reserved">pathname</span><span class="plain"> *</span><span class="identifier">H</span><span class="plain"> = </span><span class="identifier">W</span><span class="plain">-&gt;</span><span class="element">redirect_weaves_to</span><span class="plain">;</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">H</span><span class="plain"> == </span><span class="identifier">NULL</span><span class="plain">) </span><span class="identifier">H</span><span class="plain"> = </span><span class="functiontext"><a href="2-tr.html#SP7">Reader::woven_folder</a></span><span class="identifier">W</span><span class="plain">);</span>
<span class="identifier">H</span><span class="plain"> = </span><span class="functiontext"><a href="3-pth.html#SP7">Pathnames::up</a></span><span class="identifier">H</span><span class="plain">);</span>
<span class="functiontext"><a href="3-shl.html#SP3">Shell::copy</a></span><span class="identifier">F</span><span class="plain">, </span><span class="identifier">H</span><span class="plain">, </span><span class="string">""</span><span class="plain">);</span>
<span class="plain">}</span>
</pre>
<p class="inwebparagraph"></p>
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