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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>Codename Roadsign</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="../index.html">
<img src="../docs-src/Figures/Inform.png" height=72">
</a></h1>
<ul><li><a href="../compiler.html">compiler tools</a></li>
<li><a href="../other.html">other tools</a></li>
<li><a href="../extensions.html">extensions and kits</a></li>
<li><a href="../units.html">unit test tools</a></li>
</ul><h2>Other Tools</h2><ul>
<li><a href="../inblorb/index.html">inblorb</a></li>
<li><a href="index.html"><span class="selectedlink">indoc</span></a></li>
<li><a href="../inpolicy/index.html">inpolicy</a></li>
<li><a href="../inrtps/index.html">inrtps</a></li>
</ul><h2>Foundation</h2><ul>
<li><a href="../../../inweb/docs/foundation-module/index.html">foundation</a></li>
</ul>
</nav>
<main role="main">
<!--Weave of 'Codename Roadsign' generated by 7-->
<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../other.html">Other Tools</a></li><li><a href="index.html">indoc</a></li><li><a href="index.html#4">Chapter 4: Navigation Styles</a></li><li><b>Codename Roadsign</b></li></ul><p class="purpose">The "roadsign" style of navigational gadgets.</p>
<ul class="toc"><li><a href="#SP1">&#167;1. Creation</a></li><li><a href="#SP2">&#167;2. Top</a></li><li><a href="#SP5">&#167;5. Index top</a></li><li><a href="#SP6">&#167;6. Middle</a></li><li><a href="#SP7">&#167;7. Example top</a></li><li><a href="#SP8">&#167;8. Utility routines</a></li><li><a href="#SP12">&#167;12. Ecce romani</a></li></ul><hr class="tocbar">
<p class="inwebparagraph"><a id="SP1"></a><b>&#167;1. Creation. </b></p>
<pre class="display">
<span class="reserved">navigation_design</span><span class="plain"> *</span><span class="functiontext">Roadsign::create<button class="popup" onclick="togglePopup('usagePopup168')">...<span class="popuptext" id="usagePopup168">Usage of <b>Roadsign::create</b>:<br>Navigational Designs - <a href="4-nd.html#SP1">&#167;1</a></span></button></span><span class="plain">(</span><span class="reserved">void</span><span class="plain">) {</span>
<span class="reserved">navigation_design</span><span class="plain"> *</span><span class="identifier">ND</span><span class="plain"> = </span><span class="functiontext"><a href="4-nd.html#SP1">Nav::new</a></span><span class="plain">(</span><span class="identifier">I</span><span class="string">"roadsign"</span><span class="plain">, </span><span class="constant">TRUE</span><span class="plain">, </span><span class="constant">FALSE</span><span class="plain">);</span>
<span class="identifier">METHOD_ADD</span><span class="plain">(</span><span class="identifier">ND</span><span class="plain">, </span><span class="constant">RENDER_VOLUME_TITLE_MTID</span><span class="plain">, </span><span class="functiontext"><a href="#SP2">Roadsign::roadsign_volume_title</a></span><span class="plain">);</span>
<span class="identifier">METHOD_ADD</span><span class="plain">(</span><span class="identifier">ND</span><span class="plain">, </span><span class="constant">RENDER_CHAPTER_TITLE_MTID</span><span class="plain">, </span><span class="functiontext"><a href="#SP3">Roadsign::roadsign_chapter_title</a></span><span class="plain">);</span>
<span class="identifier">METHOD_ADD</span><span class="plain">(</span><span class="identifier">ND</span><span class="plain">, </span><span class="constant">RENDER_SECTION_TITLE_MTID</span><span class="plain">, </span><span class="functiontext"><a href="#SP4">Roadsign::roadsign_section_title</a></span><span class="plain">);</span>
<span class="identifier">METHOD_ADD</span><span class="plain">(</span><span class="identifier">ND</span><span class="plain">, </span><span class="constant">RENDER_INDEX_TOP_MTID</span><span class="plain">, </span><span class="functiontext"><a href="#SP5">Roadsign::roadsign_navigation_index_top</a></span><span class="plain">);</span>
<span class="identifier">METHOD_ADD</span><span class="plain">(</span><span class="identifier">ND</span><span class="plain">, </span><span class="constant">RENDER_NAV_MIDDLE_MTID</span><span class="plain">, </span><span class="functiontext"><a href="#SP6">Roadsign::roadsign_navigation_middle</a></span><span class="plain">);</span>
<span class="identifier">METHOD_ADD</span><span class="plain">(</span><span class="identifier">ND</span><span class="plain">, </span><span class="constant">RENDER_EXAMPLE_TOP_MTID</span><span class="plain">, </span><span class="functiontext"><a href="#SP7">Roadsign::roadsign_navigation_example_top</a></span><span class="plain">);</span>
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">ND</span><span class="plain">;</span>
<span class="plain">}</span>
</pre>
<p class="inwebparagraph"></p>
<p class="inwebparagraph"><a id="SP2"></a><b>&#167;2. Top. </b>At the front end of a section, before any of its text.
</p>
<pre class="display">
<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">Roadsign::roadsign_volume_title<button class="popup" onclick="togglePopup('usagePopup169')">...<span class="popuptext" id="usagePopup169">Usage of <b>Roadsign::roadsign_volume_title</b>:<br><a href="#SP1">&#167;1</a></span></button></span><span class="plain">(</span><span class="reserved">navigation_design</span><span class="plain"> *</span><span class="identifier">self</span><span class="plain">, </span><span class="reserved">text_stream</span><span class="plain"> *</span><span class="identifier">OUT</span><span class="plain">, </span><span class="reserved">volume</span><span class="plain"> *</span><span class="identifier">V</span><span class="plain">) {</span>
&lt;<span class="cwebmacro">Render a volume heading</span> <span class="cwebmacronumber">2.1</span>&gt;<span class="plain">;</span>
&lt;<span class="cwebmacro">Render a chapter-contents table</span> <span class="cwebmacronumber">2.2</span>&gt;<span class="plain">;</span>
<span class="identifier">HTML_OPEN</span><span class="plain">(</span><span class="string">"p"</span><span class="plain">); </span><span class="identifier">HTML_CLOSE</span><span class="plain">(</span><span class="string">"p"</span><span class="plain">);</span>
&lt;<span class="cwebmacro">Render the volume-top roadsign</span> <span class="cwebmacronumber">2.3</span>&gt;<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">Render a volume heading</span> <span class="cwebmacronumber">2.1</span>&gt; =
</code></p>
<pre class="displaydefn">
<span class="identifier">TEMPORARY_TEXT</span><span class="plain">(</span><span class="identifier">partn</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">no_volumes</span><span class="plain"> &gt; </span><span class="constant">1</span><span class="plain">) </span><span class="functiontext"><a href="#SP12">Roadsign::roman_numeral</a></span><span class="plain">(</span><span class="identifier">partn</span><span class="plain">, </span><span class="identifier">V</span><span class="plain">-&gt;</span><span class="element">allocation_id</span><span class="plain">);</span>
<span class="identifier">HTML_OPEN_WITH</span><span class="plain">(</span><span class="string">"p"</span><span class="plain">, </span><span class="string">"class=\"volumeheading\""</span><span class="plain">);</span>
<span class="identifier">WRITE</span><span class="plain">(</span><span class="string">"%S%S"</span><span class="plain">, </span><span class="identifier">partn</span><span class="plain">, </span><span class="identifier">V</span><span class="plain">-&gt;</span><span class="element">vol_title</span><span class="plain">);</span>
<span class="identifier">HTML_CLOSE</span><span class="plain">(</span><span class="string">"p"</span><span class="plain">);</span>
<span class="identifier">DISCARD_TEXT</span><span class="plain">(</span><span class="identifier">partn</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>Some cumbersome Perl to produce a balanced two-column chapter listing:
</p>
<p class="macrodefinition"><code class="display">
&lt;<span class="cwebmacrodefn">Render a chapter-contents table</span> <span class="cwebmacronumber">2.2</span>&gt; =
</code></p>
<pre class="displaydefn">
<span class="identifier">HTML_OPEN_WITH</span><span class="plain">(</span><span class="string">"table"</span><span class="plain">, </span><span class="string">"class=\"centredtable\""</span><span class="plain">);</span>
<span class="reserved">int</span><span class="plain"> </span><span class="identifier">nch</span><span class="plain"> = </span><span class="identifier">V</span><span class="plain">-&gt;</span><span class="element">vol_chapter_count</span><span class="plain">;</span>
<span class="reserved">int</span><span class="plain"> </span><span class="identifier">rows</span><span class="plain"> = </span><span class="identifier">nch</span><span class="plain">/2;</span>
<span class="reserved">if</span><span class="plain"> (2 * </span><span class="identifier">rows</span><span class="plain"> &lt; </span><span class="identifier">nch</span><span class="plain">) </span><span class="identifier">rows</span><span class="plain">++;</span>
<span class="reserved">for</span><span class="plain"> (</span><span class="reserved">int</span><span class="plain"> </span><span class="identifier">rc</span><span class="plain"> = </span><span class="constant">0</span><span class="plain">; </span><span class="identifier">rc</span><span class="plain"> &lt; </span><span class="identifier">rows</span><span class="plain">; </span><span class="identifier">rc</span><span class="plain">++) {</span>
<span class="reserved">chapter</span><span class="plain"> *</span><span class="identifier">C</span><span class="plain"> = </span><span class="identifier">V</span><span class="plain">-&gt;</span><span class="element">chapters</span><span class="plain">[</span><span class="identifier">rc</span><span class="plain">];</span>
<span class="reserved">chapter</span><span class="plain"> *</span><span class="identifier">OC</span><span class="plain"> = </span><span class="identifier">V</span><span class="plain">-&gt;</span><span class="element">chapters</span><span class="plain">[</span><span class="identifier">rc</span><span class="plain"> + </span><span class="identifier">rows</span><span class="plain">];</span>
<span class="identifier">HTML_OPEN</span><span class="plain">(</span><span class="string">"tr"</span><span class="plain">);</span>
<span class="identifier">HTML_OPEN</span><span class="plain">(</span><span class="string">"td"</span><span class="plain">);</span>
<span class="functiontext"><a href="5-htm.html#SP15">HTML::begin_link_with_class</a></span><span class="plain">(</span><span class="identifier">OUT</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"standardlink"</span><span class="plain">, </span><span class="identifier">C</span><span class="plain">-&gt;</span><span class="element">chapter_URL</span><span class="plain">);</span>
<span class="identifier">HTML_OPEN_WITH</span><span class="plain">(</span><span class="string">"span"</span><span class="plain">, </span><span class="string">"class=\"chapterlisting\""</span><span class="plain">);</span>
<span class="identifier">WRITE</span><span class="plain">(</span><span class="string">"%S"</span><span class="plain">, </span><span class="identifier">C</span><span class="plain">-&gt;</span><span class="element">chapter_full_title</span><span class="plain">);</span>
<span class="identifier">HTML_CLOSE</span><span class="plain">(</span><span class="string">"span"</span><span class="plain">);</span>
<span class="functiontext"><a href="5-htm.html#SP15">HTML::end_link</a></span><span class="plain">(</span><span class="identifier">OUT</span><span class="plain">);</span>
<span class="identifier">WRITE</span><span class="plain">(</span><span class="string">"&amp;#160;&amp;#160;&amp;#160;&lt;/td&gt;"</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">OC</span><span class="plain">) {</span>
<span class="identifier">HTML_OPEN</span><span class="plain">(</span><span class="string">"td"</span><span class="plain">);</span>
<span class="functiontext"><a href="5-htm.html#SP15">HTML::begin_link_with_class</a></span><span class="plain">(</span><span class="identifier">OUT</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"standardlink"</span><span class="plain">, </span><span class="identifier">OC</span><span class="plain">-&gt;</span><span class="element">chapter_URL</span><span class="plain">);</span>
<span class="identifier">HTML_OPEN_WITH</span><span class="plain">(</span><span class="string">"span"</span><span class="plain">, </span><span class="string">"class=\"chapterlisting\""</span><span class="plain">);</span>
<span class="identifier">WRITE</span><span class="plain">(</span><span class="string">"%S"</span><span class="plain">, </span><span class="identifier">OC</span><span class="plain">-&gt;</span><span class="element">chapter_full_title</span><span class="plain">);</span>
<span class="identifier">HTML_CLOSE</span><span class="plain">(</span><span class="string">"span"</span><span class="plain">);</span>
<span class="functiontext"><a href="5-htm.html#SP15">HTML::end_link</a></span><span class="plain">(</span><span class="identifier">OUT</span><span class="plain">);</span>
<span class="identifier">WRITE</span><span class="plain">(</span><span class="string">"&amp;#160;&amp;#160;&amp;#160;&lt;/td&gt;"</span><span class="plain">);</span>
<span class="plain">}</span>
<span class="identifier">HTML_CLOSE</span><span class="plain">(</span><span class="string">"tr"</span><span class="plain">);</span>
<span class="plain">}</span>
<span class="identifier">HTML_CLOSE</span><span class="plain">(</span><span class="string">"table"</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">Render the volume-top roadsign</span> <span class="cwebmacronumber">2.3</span>&gt; =
</code></p>
<pre class="displaydefn">
<span class="functiontext"><a href="#SP9">Roadsign::roadsign_begin</a></span><span class="plain">(</span><span class="identifier">OUT</span><span class="plain">, </span><span class="constant">1</span><span class="plain">);</span>
<span class="identifier">TEMPORARY_TEXT</span><span class="plain">(</span><span class="identifier">txt</span><span class="plain">);</span>
<span class="identifier">WRITE_TO</span><span class="plain">(</span><span class="identifier">txt</span><span class="plain">, </span><span class="string">"Start reading here: %c%S"</span><span class="plain">, </span><span class="constant">SECTION_SYMBOL</span><span class="plain">, </span><span class="identifier">V</span><span class="plain">-&gt;</span><span class="element">sections</span><span class="plain">[0]-&gt;</span><span class="element">title</span><span class="plain">);</span>
<span class="functiontext"><a href="#SP10">Roadsign::roadsign_add_direction</a></span><span class="plain">(</span><span class="identifier">OUT</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"arrow-right.png"</span><span class="plain">, </span><span class="identifier">txt</span><span class="plain">, </span><span class="identifier">V</span><span class="plain">-&gt;</span><span class="element">chapters</span><span class="plain">[0]-&gt;</span><span class="element">chapter_URL</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">no_volumes</span><span class="plain"> &gt; </span><span class="constant">1</span><span class="plain">) {</span>
<span class="reserved">for</span><span class="plain"> (</span><span class="reserved">int</span><span class="plain"> </span><span class="identifier">v</span><span class="plain"> = </span><span class="constant">0</span><span class="plain">; </span><span class="identifier">v</span><span class="plain"> &lt; </span><span class="identifier">no_volumes</span><span class="plain">; </span><span class="identifier">v</span><span class="plain">++) {</span>
<span class="identifier">TEMPORARY_TEXT</span><span class="plain">(</span><span class="identifier">icon</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">v</span><span class="plain"> &lt; </span><span class="identifier">V</span><span class="plain">-&gt;</span><span class="identifier">allocation_id</span><span class="plain">) </span><span class="identifier">WRITE_TO</span><span class="plain">(</span><span class="identifier">icon</span><span class="plain">, </span><span class="string">"arrow-up"</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">v</span><span class="plain"> &gt; </span><span class="identifier">V</span><span class="plain">-&gt;</span><span class="identifier">allocation_id</span><span class="plain">) </span><span class="identifier">WRITE_TO</span><span class="plain">(</span><span class="identifier">icon</span><span class="plain">, </span><span class="string">"arrow-down"</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="functiontext"><a href="4-sm.html#SP8">Str::len</a></span><span class="plain">(</span><span class="identifier">icon</span><span class="plain">) &gt; </span><span class="constant">0</span><span class="plain">) {</span>
<span class="reserved">volume</span><span class="plain"> *</span><span class="identifier">LV</span><span class="plain"> = </span><span class="identifier">volumes</span><span class="plain">[</span><span class="identifier">v</span><span class="plain">];</span>
<span class="identifier">TEMPORARY_TEXT</span><span class="plain">(</span><span class="identifier">txt</span><span class="plain">);</span>
<span class="functiontext"><a href="#SP12">Roadsign::roman_numeral</a></span><span class="plain">(</span><span class="identifier">txt</span><span class="plain">, </span><span class="identifier">v</span><span class="plain">);</span>
<span class="identifier">WRITE_TO</span><span class="plain">(</span><span class="identifier">txt</span><span class="plain">, </span><span class="string">"%S"</span><span class="plain">, </span><span class="identifier">LV</span><span class="plain">-&gt;</span><span class="element">vol_title</span><span class="plain">);</span>
<span class="identifier">TEMPORARY_TEXT</span><span class="plain">(</span><span class="identifier">img</span><span class="plain">);</span>
<span class="identifier">WRITE_TO</span><span class="plain">(</span><span class="identifier">img</span><span class="plain">, </span><span class="string">"%S.png"</span><span class="plain">, </span><span class="identifier">icon</span><span class="plain">);</span>
<span class="functiontext"><a href="#SP10">Roadsign::roadsign_add_direction</a></span><span class="plain">(</span><span class="identifier">OUT</span><span class="plain">, </span><span class="identifier">img</span><span class="plain">, </span><span class="identifier">txt</span><span class="plain">, </span><span class="identifier">LV</span><span class="plain">-&gt;</span><span class="element">vol_URL</span><span class="plain">);</span>
<span class="identifier">DISCARD_TEXT</span><span class="plain">(</span><span class="identifier">txt</span><span class="plain">);</span>
<span class="identifier">DISCARD_TEXT</span><span class="plain">(</span><span class="identifier">img</span><span class="plain">);</span>
<span class="plain">}</span>
<span class="identifier">DISCARD_TEXT</span><span class="plain">(</span><span class="identifier">icon</span><span class="plain">);</span>
<span class="plain">}</span>
<span class="plain">}</span>
<span class="reserved">if</span><span class="plain"> ((</span><span class="identifier">no_examples</span><span class="plain"> &gt; </span><span class="constant">0</span><span class="plain">) &amp;&amp; (</span><span class="identifier">NUMBER_CREATED</span><span class="plain">(</span><span class="reserved">index_lemma</span><span class="plain">) &gt; </span><span class="constant">0</span><span class="plain">)) {</span>
<span class="functiontext"><a href="#SP10">Roadsign::roadsign_add_direction</a></span><span class="plain">(</span><span class="identifier">OUT</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"arrow-down-right.png"</span><span class="plain">,</span>
<span class="identifier">I</span><span class="string">"Indexes of the examples and definitions"</span><span class="plain">, </span><span class="identifier">indoc_settings</span><span class="plain">-&gt;</span><span class="element">examples_alphabetical_leafname</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="identifier">no_examples</span><span class="plain"> &gt; </span><span class="constant">0</span><span class="plain">) {</span>
<span class="functiontext"><a href="#SP10">Roadsign::roadsign_add_direction</a></span><span class="plain">(</span><span class="identifier">OUT</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"arrow-down-right.png"</span><span class="plain">,</span>
<span class="identifier">I</span><span class="string">"Indexes of the examples"</span><span class="plain">, </span><span class="identifier">indoc_settings</span><span class="plain">-&gt;</span><span class="element">examples_alphabetical_leafname</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="identifier">NUMBER_CREATED</span><span class="plain">(</span><span class="reserved">index_lemma</span><span class="plain">) &gt; </span><span class="constant">0</span><span class="plain">) {</span>
<span class="functiontext"><a href="#SP10">Roadsign::roadsign_add_direction</a></span><span class="plain">(</span><span class="identifier">OUT</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"arrow-down-right.png"</span><span class="plain">,</span>
<span class="identifier">I</span><span class="string">"Index of definitions"</span><span class="plain">, </span><span class="identifier">indoc_settings</span><span class="plain">-&gt;</span><span class="element">definitions_index_leafname</span><span class="plain">);</span>
<span class="plain">}</span>
<span class="functiontext"><a href="#SP11">Roadsign::roadsign_end</a></span><span class="plain">(</span><span class="identifier">OUT</span><span class="plain">, </span><span class="constant">1</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></p>
<pre class="display">
<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">Roadsign::roadsign_chapter_title<button class="popup" onclick="togglePopup('usagePopup170')">...<span class="popuptext" id="usagePopup170">Usage of <b>Roadsign::roadsign_chapter_title</b>:<br><a href="#SP1">&#167;1</a></span></button></span><span class="plain">(</span><span class="reserved">navigation_design</span><span class="plain"> *</span><span class="identifier">self</span><span class="plain">, </span><span class="reserved">text_stream</span><span class="plain"> *</span><span class="identifier">OUT</span><span class="plain">, </span><span class="reserved">volume</span><span class="plain"> *</span><span class="identifier">V</span><span class="plain">, </span><span class="reserved">chapter</span><span class="plain"> *</span><span class="identifier">C</span><span class="plain">) {</span>
&lt;<span class="cwebmacro">Render a chapter heading</span> <span class="cwebmacronumber">3.1</span>&gt;<span class="plain">;</span>
&lt;<span class="cwebmacro">Render a section-contents listing</span> <span class="cwebmacronumber">3.2</span>&gt;<span class="plain">;</span>
<span class="functiontext"><a href="#SP8">Roadsign::roadsign_chapter_jumps</a></span><span class="plain">(</span><span class="identifier">OUT</span><span class="plain">, </span><span class="identifier">V</span><span class="plain">, </span><span class="identifier">C</span><span class="plain">, </span><span class="constant">0</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">Render a chapter heading</span> <span class="cwebmacronumber">3.1</span>&gt; =
</code></p>
<pre class="displaydefn">
<span class="identifier">HTML_OPEN_WITH</span><span class="plain">(</span><span class="string">"p"</span><span class="plain">, </span><span class="string">"class=\"chapterheading\""</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="functiontext"><a href="4-sm.html#SP8">Str::len</a></span><span class="plain">(</span><span class="identifier">C</span><span class="plain">-&gt;</span><span class="element">chapter_anchor</span><span class="plain">) &gt; </span><span class="constant">0</span><span class="plain">) </span><span class="functiontext"><a href="5-htm.html#SP15">HTML::anchor</a></span><span class="plain">(</span><span class="identifier">OUT</span><span class="plain">, </span><span class="identifier">C</span><span class="plain">-&gt;</span><span class="element">chapter_anchor</span><span class="plain">);</span>
<span class="identifier">WRITE</span><span class="plain">(</span><span class="string">"%S"</span><span class="plain">, </span><span class="identifier">C</span><span class="plain">-&gt;</span><span class="element">chapter_full_title</span><span class="plain">);</span>
<span class="identifier">HTML_CLOSE</span><span class="plain">(</span><span class="string">"p"</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">Render a section-contents listing</span> <span class="cwebmacronumber">3.2</span>&gt; =
</code></p>
<pre class="displaydefn">
<span class="identifier">HTML_OPEN_WITH</span><span class="plain">(</span><span class="string">"p"</span><span class="plain">, </span><span class="string">"class=\"chaptercontents\""</span><span class="plain">);</span>
<span class="reserved">int</span><span class="plain"> </span><span class="identifier">lcount</span><span class="plain"> = </span><span class="constant">0</span><span class="plain">;</span>
<span class="reserved">for</span><span class="plain"> (</span><span class="reserved">section</span><span class="plain"> *</span><span class="identifier">S</span><span class="plain"> = </span><span class="identifier">V</span><span class="plain">-&gt;</span><span class="element">sections</span><span class="plain">[0]; </span><span class="identifier">S</span><span class="plain">; </span><span class="identifier">S</span><span class="plain"> = </span><span class="identifier">S</span><span class="plain">-&gt;</span><span class="element">next_section</span><span class="plain">)</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">S</span><span class="plain">-&gt;</span><span class="element">in_which_chapter</span><span class="plain"> == </span><span class="identifier">C</span><span class="plain">) {</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">lcount</span><span class="plain">++ &gt; </span><span class="constant">0</span><span class="plain">) </span><span class="identifier">WRITE</span><span class="plain">(</span><span class="string">"; "</span><span class="plain">);</span>
<span class="functiontext"><a href="5-htm.html#SP15">HTML::begin_link_with_class</a></span><span class="plain">(</span><span class="identifier">OUT</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"standardlink"</span><span class="plain">, </span><span class="identifier">S</span><span class="plain">-&gt;</span><span class="element">section_URL</span><span class="plain">);</span>
<span class="identifier">HTML_OPEN_WITH</span><span class="plain">(</span><span class="string">"span"</span><span class="plain">, </span><span class="string">"class=\"chaptercontentsitem\""</span><span class="plain">);</span>
<span class="identifier">WRITE</span><span class="plain">(</span><span class="string">"%c%S"</span><span class="plain">, </span><span class="constant">SECTION_SYMBOL</span><span class="plain">, </span><span class="identifier">S</span><span class="plain">-&gt;</span><span class="identifier">title</span><span class="plain">);</span>
<span class="identifier">HTML_CLOSE</span><span class="plain">(</span><span class="string">"span"</span><span class="plain">);</span>
<span class="functiontext"><a href="5-htm.html#SP15">HTML::end_link</a></span><span class="plain">(</span><span class="identifier">OUT</span><span class="plain">);</span>
<span class="plain">}</span>
<span class="identifier">HTML_CLOSE</span><span class="plain">(</span><span class="string">"p"</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">void</span><span class="plain"> </span><span class="functiontext">Roadsign::roadsign_section_title<button class="popup" onclick="togglePopup('usagePopup171')">...<span class="popuptext" id="usagePopup171">Usage of <b>Roadsign::roadsign_section_title</b>:<br><a href="#SP1">&#167;1</a></span></button></span><span class="plain">(</span><span class="reserved">navigation_design</span><span class="plain"> *</span><span class="identifier">self</span><span class="plain">, </span><span class="reserved">text_stream</span><span class="plain"> *</span><span class="identifier">OUT</span><span class="plain">, </span><span class="reserved">volume</span><span class="plain"> *</span><span class="identifier">V</span><span class="plain">, </span><span class="reserved">chapter</span><span class="plain"> *</span><span class="identifier">C</span><span class="plain">, </span><span class="reserved">section</span><span class="plain"> *</span><span class="identifier">S</span><span class="plain">) {</span>
<span class="identifier">HTML_OPEN_WITH</span><span class="plain">(</span><span class="string">"p"</span><span class="plain">, </span><span class="string">"class=\"sectionheading\""</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="functiontext"><a href="4-sm.html#SP8">Str::len</a></span><span class="plain">(</span><span class="identifier">S</span><span class="plain">-&gt;</span><span class="element">section_anchor</span><span class="plain">) &gt; </span><span class="constant">0</span><span class="plain">) </span><span class="functiontext"><a href="5-htm.html#SP15">HTML::anchor</a></span><span class="plain">(</span><span class="identifier">OUT</span><span class="plain">, </span><span class="identifier">S</span><span class="plain">-&gt;</span><span class="element">section_anchor</span><span class="plain">);</span>
<span class="identifier">WRITE</span><span class="plain">(</span><span class="string">"%c%S"</span><span class="plain">, </span><span class="constant">SECTION_SYMBOL</span><span class="plain">, </span><span class="identifier">S</span><span class="plain">-&gt;</span><span class="identifier">title</span><span class="plain">);</span>
<span class="identifier">HTML_CLOSE</span><span class="plain">(</span><span class="string">"p"</span><span class="plain">);</span>
<span class="plain">}</span>
</pre>
<p class="inwebparagraph"></p>
<p class="inwebparagraph"><a id="SP5"></a><b>&#167;5. Index top. </b>And this is a variant for index pages, such as the index of examples.
</p>
<pre class="display">
<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">Roadsign::roadsign_navigation_index_top<button class="popup" onclick="togglePopup('usagePopup172')">...<span class="popuptext" id="usagePopup172">Usage of <b>Roadsign::roadsign_navigation_index_top</b>:<br><a href="#SP1">&#167;1</a></span></button></span><span class="plain">(</span><span class="reserved">navigation_design</span><span class="plain"> *</span><span class="identifier">self</span><span class="plain">, </span><span class="reserved">text_stream</span><span class="plain"> *</span><span class="identifier">OUT</span><span class="plain">, </span><span class="reserved">text_stream</span><span class="plain"> *</span><span class="reserved">filename</span><span class="plain">, </span><span class="reserved">text_stream</span><span class="plain"> *</span><span class="identifier">title</span><span class="plain">) {</span>
<span class="identifier">HTML_OPEN_WITH</span><span class="plain">(</span><span class="string">"p"</span><span class="plain">, </span><span class="string">"class=\"chapterheading\""</span><span class="plain">);</span>
<span class="identifier">WRITE</span><span class="plain">(</span><span class="string">"%S"</span><span class="plain">, </span><span class="identifier">title</span><span class="plain">);</span>
<span class="identifier">HTML_CLOSE</span><span class="plain">(</span><span class="string">"p"</span><span class="plain">);</span>
<span class="functiontext"><a href="#SP9">Roadsign::roadsign_begin</a></span><span class="plain">(</span><span class="identifier">OUT</span><span class="plain">, </span><span class="constant">1</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">no_examples</span><span class="plain"> &gt; </span><span class="constant">0</span><span class="plain">) {</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="functiontext"><a href="4-sm.html#SP18">Str::ne</a></span><span class="plain">(</span><span class="reserved">filename</span><span class="plain">, </span><span class="identifier">indoc_settings</span><span class="plain">-&gt;</span><span class="element">examples_alphabetical_leafname</span><span class="plain">))</span>
<span class="functiontext"><a href="#SP10">Roadsign::roadsign_add_direction</a></span><span class="plain">(</span><span class="identifier">OUT</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"arrow-right.png"</span><span class="plain">,</span>
<span class="identifier">I</span><span class="string">"Examples in Alphabetical Order"</span><span class="plain">, </span><span class="identifier">indoc_settings</span><span class="plain">-&gt;</span><span class="element">examples_alphabetical_leafname</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="functiontext"><a href="4-sm.html#SP18">Str::ne</a></span><span class="plain">(</span><span class="reserved">filename</span><span class="plain">, </span><span class="identifier">indoc_settings</span><span class="plain">-&gt;</span><span class="element">examples_thematic_leafname</span><span class="plain">))</span>
<span class="functiontext"><a href="#SP10">Roadsign::roadsign_add_direction</a></span><span class="plain">(</span><span class="identifier">OUT</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"arrow-right.png"</span><span class="plain">,</span>
<span class="identifier">I</span><span class="string">"Examples in Thematic Order"</span><span class="plain">, </span><span class="identifier">indoc_settings</span><span class="plain">-&gt;</span><span class="element">examples_thematic_leafname</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="functiontext"><a href="4-sm.html#SP18">Str::ne</a></span><span class="plain">(</span><span class="reserved">filename</span><span class="plain">, </span><span class="identifier">indoc_settings</span><span class="plain">-&gt;</span><span class="element">examples_numerical_leafname</span><span class="plain">))</span>
<span class="functiontext"><a href="#SP10">Roadsign::roadsign_add_direction</a></span><span class="plain">(</span><span class="identifier">OUT</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"arrow-right.png"</span><span class="plain">,</span>
<span class="identifier">I</span><span class="string">"Examples in Numerical Order"</span><span class="plain">, </span><span class="identifier">indoc_settings</span><span class="plain">-&gt;</span><span class="element">examples_numerical_leafname</span><span class="plain">);</span>
<span class="plain">}</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">NUMBER_CREATED</span><span class="plain">(</span><span class="reserved">index_lemma</span><span class="plain">) &gt; </span><span class="constant">0</span><span class="plain">)</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="functiontext"><a href="4-sm.html#SP18">Str::ne</a></span><span class="plain">(</span><span class="reserved">filename</span><span class="plain">, </span><span class="identifier">indoc_settings</span><span class="plain">-&gt;</span><span class="element">definitions_index_leafname</span><span class="plain">))</span>
<span class="functiontext"><a href="#SP10">Roadsign::roadsign_add_direction</a></span><span class="plain">(</span><span class="identifier">OUT</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"arrow-right.png"</span><span class="plain">,</span>
<span class="identifier">I</span><span class="string">"General Index"</span><span class="plain">, </span><span class="identifier">indoc_settings</span><span class="plain">-&gt;</span><span class="element">definitions_index_leafname</span><span class="plain">);</span>
<span class="reserved">for</span><span class="plain"> (</span><span class="reserved">int</span><span class="plain"> </span><span class="identifier">v</span><span class="plain"> = </span><span class="constant">0</span><span class="plain">; </span><span class="identifier">v</span><span class="plain"> &lt; </span><span class="identifier">no_volumes</span><span class="plain">; </span><span class="identifier">v</span><span class="plain">++) {</span>
<span class="reserved">volume</span><span class="plain"> *</span><span class="identifier">V</span><span class="plain"> = </span><span class="identifier">volumes</span><span class="plain">[</span><span class="identifier">v</span><span class="plain">];</span>
<span class="identifier">TEMPORARY_TEXT</span><span class="plain">(</span><span class="identifier">text</span><span class="plain">);</span>
<span class="functiontext"><a href="#SP12">Roadsign::roman_numeral</a></span><span class="plain">(</span><span class="identifier">text</span><span class="plain">, </span><span class="identifier">v</span><span class="plain">);</span>
<span class="identifier">WRITE_TO</span><span class="plain">(</span><span class="identifier">text</span><span class="plain">, </span><span class="string">"%S"</span><span class="plain">, </span><span class="identifier">V</span><span class="plain">-&gt;</span><span class="element">vol_title</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">no_volumes</span><span class="plain"> == </span><span class="constant">1</span><span class="plain">) </span><span class="functiontext"><a href="4-sm.html#SP16">Str::copy</a></span><span class="plain">(</span><span class="identifier">text</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"Contents"</span><span class="plain">);</span>
<span class="functiontext"><a href="#SP10">Roadsign::roadsign_add_direction</a></span><span class="plain">(</span><span class="identifier">OUT</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"arrow-up-left.png"</span><span class="plain">, </span><span class="identifier">text</span><span class="plain">, </span><span class="identifier">V</span><span class="plain">-&gt;</span><span class="element">vol_URL</span><span class="plain">);</span>
<span class="identifier">DISCARD_TEXT</span><span class="plain">(</span><span class="identifier">text</span><span class="plain">);</span>
<span class="plain">}</span>
<span class="functiontext"><a href="#SP11">Roadsign::roadsign_end</a></span><span class="plain">(</span><span class="identifier">OUT</span><span class="plain">, </span><span class="constant">1</span><span class="plain">);</span>
<span class="functiontext"><a href="2-haj.html#SP12">HTMLUtilities::ruled_line</a></span><span class="plain">(</span><span class="identifier">OUT</span><span class="plain">);</span>
<span class="plain">}</span>
</pre>
<p class="inwebparagraph"></p>
<p class="inwebparagraph"><a id="SP6"></a><b>&#167;6. Middle. </b>At the middle part, when the text is over, but before any example cues.
</p>
<pre class="display">
<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">Roadsign::roadsign_navigation_middle<button class="popup" onclick="togglePopup('usagePopup173')">...<span class="popuptext" id="usagePopup173">Usage of <b>Roadsign::roadsign_navigation_middle</b>:<br><a href="#SP1">&#167;1</a></span></button></span><span class="plain">(</span><span class="reserved">navigation_design</span><span class="plain"> *</span><span class="identifier">self</span><span class="plain">, </span><span class="reserved">text_stream</span><span class="plain"> *</span><span class="identifier">OUT</span><span class="plain">, </span><span class="reserved">volume</span><span class="plain"> *</span><span class="identifier">V</span><span class="plain">, </span><span class="reserved">section</span><span class="plain"> *</span><span class="identifier">S</span><span class="plain">) {</span>
<span class="functiontext"><a href="2-haj.html#SP12">HTMLUtilities::ruled_line</a></span><span class="plain">(</span><span class="identifier">OUT</span><span class="plain">);</span>
<span class="functiontext"><a href="5-htm.html#SP13">HTML::begin_div_with_class_S</a></span><span class="plain">(</span><span class="identifier">OUT</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"roadsigns"</span><span class="plain">);</span>
<span class="reserved">chapter</span><span class="plain"> *</span><span class="identifier">C</span><span class="plain"> = </span><span class="identifier">S</span><span class="plain">-&gt;</span><span class="element">in_which_chapter</span><span class="plain">;</span>
<span class="functiontext"><a href="#SP9">Roadsign::roadsign_begin</a></span><span class="plain">(</span><span class="identifier">OUT</span><span class="plain">, </span><span class="constant">0</span><span class="plain">);</span>
&lt;<span class="cwebmacro">Add home, back and forward directions to the roadsign</span> <span class="cwebmacronumber">6.1</span>&gt;<span class="plain">;</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">indoc_settings</span><span class="plain">-&gt;</span><span class="element">examples_mode</span><span class="plain"> == </span><span class="constant">EXMODE_open_internal</span><span class="plain">)</span>
&lt;<span class="cwebmacro">Add directions to this section's examples to the roadsign</span> <span class="cwebmacronumber">6.2</span>&gt;<span class="character">;</span>
<span class="functiontext"><a href="#SP11">Roadsign::roadsign_end</a></span><span class="plain">(</span><span class="identifier">OUT</span><span class="plain">, </span><span class="constant">0</span><span class="plain">);</span>
<span class="functiontext"><a href="2-haj.html#SP12">HTMLUtilities::ruled_line</a></span><span class="plain">(</span><span class="identifier">OUT</span><span class="plain">);</span>
<span class="functiontext"><a href="5-htm.html#SP13">HTML::end_div</a></span><span class="plain">(</span><span class="identifier">OUT</span><span class="plain">);</span>
<span class="plain">}</span>
</pre>
<p class="inwebparagraph"></p>
<p class="inwebparagraph"><a id="SP6_1"></a><b>&#167;6.1. </b><code class="display">
&lt;<span class="cwebmacrodefn">Add home, back and forward directions to the roadsign</span> <span class="cwebmacronumber">6.1</span>&gt; =
</code></p>
<pre class="displaydefn">
<span class="identifier">TEMPORARY_TEXT</span><span class="plain">(</span><span class="identifier">txt</span><span class="plain">);</span>
<span class="identifier">WRITE_TO</span><span class="plain">(</span><span class="identifier">txt</span><span class="plain">, </span><span class="string">"Start of %S"</span><span class="plain">, </span><span class="identifier">C</span><span class="plain">-&gt;</span><span class="element">chapter_full_title</span><span class="plain">);</span>
<span class="functiontext"><a href="#SP10">Roadsign::roadsign_add_direction</a></span><span class="plain">(</span><span class="identifier">OUT</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"arrow-up.png"</span><span class="plain">, </span><span class="identifier">txt</span><span class="plain">, </span><span class="identifier">C</span><span class="plain">-&gt;</span><span class="element">chapter_URL</span><span class="plain">);</span>
<span class="identifier">DISCARD_TEXT</span><span class="plain">(</span><span class="identifier">txt</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">S</span><span class="plain">-&gt;</span><span class="element">previous_section</span><span class="plain">) {</span>
<span class="reserved">chapter</span><span class="plain"> *</span><span class="identifier">to_chap</span><span class="plain"> = </span><span class="identifier">S</span><span class="plain">-&gt;</span><span class="element">previous_section</span><span class="plain">-&gt;</span><span class="element">in_which_chapter</span><span class="plain">;</span>
<span class="identifier">TEMPORARY_TEXT</span><span class="plain">(</span><span class="identifier">link</span><span class="plain">);</span>
<span class="identifier">WRITE_TO</span><span class="plain">(</span><span class="identifier">link</span><span class="plain">, </span><span class="string">"Back to "</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">to_chap</span><span class="plain"> != </span><span class="identifier">C</span><span class="plain">)</span>
<span class="identifier">WRITE_TO</span><span class="plain">(</span><span class="identifier">link</span><span class="plain">, </span><span class="string">"Chapter %d: %S: "</span><span class="plain">, </span><span class="identifier">to_chap</span><span class="plain">-&gt;</span><span class="element">chapter_number</span><span class="plain">, </span><span class="identifier">to_chap</span><span class="plain">-&gt;</span><span class="element">chapter_title</span><span class="plain">);</span>
<span class="identifier">WRITE_TO</span><span class="plain">(</span><span class="identifier">link</span><span class="plain">, </span><span class="string">"%c%S"</span><span class="plain">, </span><span class="constant">SECTION_SYMBOL</span><span class="plain">, </span><span class="identifier">S</span><span class="plain">-&gt;</span><span class="element">previous_section</span><span class="plain">-&gt;</span><span class="element">title</span><span class="plain">);</span>
<span class="functiontext"><a href="#SP10">Roadsign::roadsign_add_direction</a></span><span class="plain">(</span><span class="identifier">OUT</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"arrow-left.png"</span><span class="plain">,</span>
<span class="identifier">link</span><span class="plain">, </span><span class="identifier">S</span><span class="plain">-&gt;</span><span class="element">previous_section</span><span class="plain">-&gt;</span><span class="element">section_URL</span><span class="plain">);</span>
<span class="identifier">DISCARD_TEXT</span><span class="plain">(</span><span class="identifier">link</span><span class="plain">);</span>
<span class="plain">}</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">S</span><span class="plain">-&gt;</span><span class="element">next_section</span><span class="plain">) {</span>
<span class="reserved">chapter</span><span class="plain"> *</span><span class="identifier">to_chap</span><span class="plain"> = </span><span class="identifier">S</span><span class="plain">-&gt;</span><span class="element">next_section</span><span class="plain">-&gt;</span><span class="element">in_which_chapter</span><span class="plain">;</span>
<span class="identifier">TEMPORARY_TEXT</span><span class="plain">(</span><span class="identifier">link</span><span class="plain">);</span>
<span class="identifier">WRITE_TO</span><span class="plain">(</span><span class="identifier">link</span><span class="plain">, </span><span class="string">"Onward to "</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">to_chap</span><span class="plain"> != </span><span class="identifier">C</span><span class="plain">)</span>
<span class="identifier">WRITE_TO</span><span class="plain">(</span><span class="identifier">link</span><span class="plain">, </span><span class="string">"Chapter %d: %S: "</span><span class="plain">, </span><span class="identifier">to_chap</span><span class="plain">-&gt;</span><span class="element">chapter_number</span><span class="plain">, </span><span class="identifier">to_chap</span><span class="plain">-&gt;</span><span class="element">chapter_title</span><span class="plain">);</span>
<span class="identifier">WRITE_TO</span><span class="plain">(</span><span class="identifier">link</span><span class="plain">, </span><span class="string">"%c%S"</span><span class="plain">, </span><span class="constant">SECTION_SYMBOL</span><span class="plain">, </span><span class="identifier">S</span><span class="plain">-&gt;</span><span class="element">next_section</span><span class="plain">-&gt;</span><span class="element">title</span><span class="plain">);</span>
<span class="functiontext"><a href="#SP10">Roadsign::roadsign_add_direction</a></span><span class="plain">(</span><span class="identifier">OUT</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"arrow-right.png"</span><span class="plain">,</span>
<span class="identifier">link</span><span class="plain">, </span><span class="identifier">S</span><span class="plain">-&gt;</span><span class="element">next_section</span><span class="plain">-&gt;</span><span class="element">section_URL</span><span class="plain">);</span>
<span class="identifier">DISCARD_TEXT</span><span class="plain">(</span><span class="identifier">link</span><span class="plain">);</span>
<span class="plain">}</span>
</pre>
<p class="inwebparagraph"></p>
<p class="endnote">This code is used in <a href="#SP6">&#167;6</a>.</p>
<p class="inwebparagraph"><a id="SP6_2"></a><b>&#167;6.2. </b><code class="display">
&lt;<span class="cwebmacrodefn">Add directions to this section's examples to the roadsign</span> <span class="cwebmacronumber">6.2</span>&gt; =
</code></p>
<pre class="displaydefn">
<span class="reserved">example</span><span class="plain"> *</span><span class="identifier">E</span><span class="plain">;</span>
<span class="identifier">LOOP_OVER</span><span class="plain">(</span><span class="identifier">E</span><span class="plain">, </span><span class="reserved">example</span><span class="plain">) {</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">E</span><span class="plain">-&gt;</span><span class="element">example_belongs_to_section</span><span class="plain">[</span><span class="identifier">V</span><span class="plain">-&gt;</span><span class="element">allocation_id</span><span class="plain">] == </span><span class="identifier">S</span><span class="plain">) {</span>
<span class="identifier">TEMPORARY_TEXT</span><span class="plain">(</span><span class="identifier">stars</span><span class="plain">);</span>
<span class="reserved">for</span><span class="plain"> (</span><span class="reserved">int</span><span class="plain"> </span><span class="identifier">starcc</span><span class="plain">=0; </span><span class="identifier">starcc</span><span class="plain"> &lt; </span><span class="identifier">E</span><span class="plain">-&gt;</span><span class="element">ex_star_count</span><span class="plain">; </span><span class="identifier">starcc</span><span class="plain">++)</span>
<span class="functiontext"><a href="2-haj.html#SP13">HTMLUtilities::asterisk_image</a></span><span class="plain">(</span><span class="identifier">stars</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"asterisk.png"</span><span class="plain">);</span>
<span class="identifier">TEMPORARY_TEXT</span><span class="plain">(</span><span class="identifier">pn</span><span class="plain">);</span>
<span class="functiontext"><a href="4-sm.html#SP16">Str::copy</a></span><span class="plain">(</span><span class="identifier">pn</span><span class="plain">, </span><span class="identifier">E</span><span class="plain">-&gt;</span><span class="element">ex_public_name</span><span class="plain">);</span>
<span class="functiontext"><a href="2-rr.html#SP5">Rawtext::escape_HTML_characters_in</a></span><span class="plain">(</span><span class="identifier">pn</span><span class="plain">);</span>
<span class="identifier">TEMPORARY_TEXT</span><span class="plain">(</span><span class="identifier">text</span><span class="plain">);</span>
<span class="identifier">WRITE_TO</span><span class="plain">(</span><span class="identifier">text</span><span class="plain">, </span><span class="string">"Example %d: %S &lt;b&gt;%S&lt;/b&gt;&amp;#160;&amp;#160;&amp;#160; %S"</span><span class="plain">,</span>
<span class="identifier">E</span><span class="plain">-&gt;</span><span class="element">example_position</span><span class="plain">[0], </span><span class="identifier">stars</span><span class="plain">, </span><span class="identifier">pn</span><span class="plain">, </span><span class="identifier">E</span><span class="plain">-&gt;</span><span class="element">ex_outline</span><span class="plain">);</span>
<span class="identifier">TEMPORARY_TEXT</span><span class="plain">(</span><span class="identifier">url</span><span class="plain">);</span>
<span class="functiontext"><a href="2-exm.html#SP11">Examples::goto_example_url</a></span><span class="plain">(</span><span class="identifier">url</span><span class="plain">, </span><span class="identifier">E</span><span class="plain">, </span><span class="identifier">V</span><span class="plain">);</span>
<span class="functiontext"><a href="#SP10">Roadsign::roadsign_add_direction</a></span><span class="plain">(</span><span class="identifier">OUT</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"arrow-down.png"</span><span class="plain">, </span><span class="identifier">text</span><span class="plain">, </span><span class="identifier">url</span><span class="plain">);</span>
<span class="identifier">DISCARD_TEXT</span><span class="plain">(</span><span class="identifier">text</span><span class="plain">);</span>
<span class="identifier">DISCARD_TEXT</span><span class="plain">(</span><span class="identifier">stars</span><span class="plain">);</span>
<span class="identifier">DISCARD_TEXT</span><span class="plain">(</span><span class="identifier">url</span><span class="plain">);</span>
<span class="plain">}</span>
<span class="plain">}</span>
</pre>
<p class="inwebparagraph"></p>
<p class="endnote">This code is used in <a href="#SP6">&#167;6</a>.</p>
<p class="inwebparagraph"><a id="SP7"></a><b>&#167;7. Example top. </b>This is reached before the first example is rendered, provided at least
one example will be:
</p>
<pre class="display">
<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">Roadsign::roadsign_navigation_example_top<button class="popup" onclick="togglePopup('usagePopup174')">...<span class="popuptext" id="usagePopup174">Usage of <b>Roadsign::roadsign_navigation_example_top</b>:<br><a href="#SP1">&#167;1</a></span></button></span><span class="plain">(</span><span class="reserved">navigation_design</span><span class="plain"> *</span><span class="identifier">self</span><span class="plain">, </span><span class="reserved">text_stream</span><span class="plain"> *</span><span class="identifier">OUT</span><span class="plain">, </span><span class="reserved">volume</span><span class="plain"> *</span><span class="identifier">V</span><span class="plain">, </span><span class="reserved">section</span><span class="plain"> *</span><span class="identifier">S</span><span class="plain">) {</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">indoc_settings</span><span class="plain">-&gt;</span><span class="element">examples_granularity</span><span class="plain"> == </span><span class="constant">CHAPTER_GRANULARITY</span><span class="plain">)</span>
<span class="functiontext"><a href="#SP8">Roadsign::roadsign_chapter_jumps</a></span><span class="plain">(</span><span class="identifier">OUT</span><span class="plain">, </span><span class="identifier">V</span><span class="plain">, </span><span class="identifier">S</span><span class="plain">-&gt;</span><span class="element">in_which_chapter</span><span class="plain">, </span><span class="constant">TRUE</span><span class="plain">);</span>
<span class="plain">}</span>
</pre>
<p class="inwebparagraph"></p>
<p class="inwebparagraph"><a id="SP8"></a><b>&#167;8. Utility routines. </b></p>
<pre class="display">
<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">Roadsign::roadsign_chapter_jumps<button class="popup" onclick="togglePopup('usagePopup175')">...<span class="popuptext" id="usagePopup175">Usage of <b>Roadsign::roadsign_chapter_jumps</b>:<br><a href="#SP3">&#167;3</a>, <a href="#SP7">&#167;7</a></span></button></span><span class="plain">(</span><span class="constant">OUTPUT_STREAM</span><span class="plain">, </span><span class="reserved">volume</span><span class="plain"> *</span><span class="identifier">V</span><span class="plain">, </span><span class="reserved">chapter</span><span class="plain"> *</span><span class="identifier">C</span><span class="plain">, </span><span class="reserved">int</span><span class="plain"> </span><span class="identifier">bottom</span><span class="plain">) {</span>
<span class="functiontext"><a href="#SP9">Roadsign::roadsign_begin</a></span><span class="plain">(</span><span class="identifier">OUT</span><span class="plain">, </span><span class="constant">1</span><span class="plain">);</span>
<span class="reserved">int</span><span class="plain"> </span><span class="identifier">chc</span><span class="plain"> = </span><span class="identifier">V</span><span class="plain">-&gt;</span><span class="element">vol_chapter_count</span><span class="plain">;</span>
<span class="reserved">if</span><span class="plain"> ((</span><span class="identifier">chc</span><span class="plain"> &gt; </span><span class="constant">1</span><span class="plain">) &amp;&amp; (</span><span class="identifier">bottom</span><span class="plain"> == </span><span class="constant">FALSE</span><span class="plain">)) {</span>
<span class="identifier">TEMPORARY_TEXT</span><span class="plain">(</span><span class="identifier">text</span><span class="plain">);</span>
<span class="identifier">WRITE_TO</span><span class="plain">(</span><span class="identifier">text</span><span class="plain">, </span><span class="string">"Contents of &lt;i&gt;%S&lt;/i&gt;"</span><span class="plain">, </span><span class="identifier">V</span><span class="plain">-&gt;</span><span class="element">vol_title</span><span class="plain">);</span>
<span class="functiontext"><a href="#SP10">Roadsign::roadsign_add_direction</a></span><span class="plain">(</span><span class="identifier">OUT</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"arrow-up-left.png"</span><span class="plain">, </span><span class="identifier">text</span><span class="plain">, </span><span class="identifier">V</span><span class="plain">-&gt;</span><span class="element">vol_URL</span><span class="plain">);</span>
<span class="identifier">DISCARD_TEXT</span><span class="plain">(</span><span class="identifier">text</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">C</span><span class="plain">-&gt;</span><span class="element">previous_chapter</span><span class="plain">)</span>
<span class="functiontext"><a href="#SP10">Roadsign::roadsign_add_direction</a></span><span class="plain">(</span><span class="identifier">OUT</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"arrow-left.png"</span><span class="plain">,</span>
<span class="identifier">C</span><span class="plain">-&gt;</span><span class="element">previous_chapter</span><span class="plain">-&gt;</span><span class="element">chapter_full_title</span><span class="plain">, </span><span class="identifier">C</span><span class="plain">-&gt;</span><span class="element">previous_chapter</span><span class="plain">-&gt;</span><span class="element">chapter_URL</span><span class="plain">);</span>
<span class="plain">}</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">bottom</span><span class="plain"> == </span><span class="constant">1</span><span class="plain">)</span>
<span class="functiontext"><a href="#SP10">Roadsign::roadsign_add_direction</a></span><span class="plain">(</span><span class="identifier">OUT</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"arrow-up.png"</span><span class="plain">,</span>
<span class="identifier">I</span><span class="string">"Start of this chapter"</span><span class="plain">, </span><span class="identifier">C</span><span class="plain">-&gt;</span><span class="element">chapter_URL</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">C</span><span class="plain">-&gt;</span><span class="element">next_chapter</span><span class="plain">)</span>
<span class="functiontext"><a href="#SP10">Roadsign::roadsign_add_direction</a></span><span class="plain">(</span><span class="identifier">OUT</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"arrow-right.png"</span><span class="plain">,</span>
<span class="identifier">C</span><span class="plain">-&gt;</span><span class="element">next_chapter</span><span class="plain">-&gt;</span><span class="element">chapter_full_title</span><span class="plain">, </span><span class="identifier">C</span><span class="plain">-&gt;</span><span class="element">next_chapter</span><span class="plain">-&gt;</span><span class="element">chapter_URL</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">no_examples</span><span class="plain"> &gt; </span><span class="constant">0</span><span class="plain">)</span>
<span class="functiontext"><a href="#SP10">Roadsign::roadsign_add_direction</a></span><span class="plain">(</span><span class="identifier">OUT</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"arrow-down-right.png"</span><span class="plain">,</span>
<span class="identifier">I</span><span class="string">"Indexes of the examples"</span><span class="plain">,</span>
<span class="identifier">indoc_settings</span><span class="plain">-&gt;</span><span class="element">examples_alphabetical_leafname</span><span class="plain">);</span>
<span class="functiontext"><a href="#SP11">Roadsign::roadsign_end</a></span><span class="plain">(</span><span class="identifier">OUT</span><span class="plain">, </span><span class="constant">1</span><span class="plain">);</span>
<span class="plain">}</span>
</pre>
<p class="inwebparagraph"></p>
<p class="inwebparagraph"><a id="SP9"></a><b>&#167;9. </b>And at a lower level: here's how a roadsign is made, as a table of links.
</p>
<pre class="display">
<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">Roadsign::roadsign_begin<button class="popup" onclick="togglePopup('usagePopup176')">...<span class="popuptext" id="usagePopup176">Usage of <b>Roadsign::roadsign_begin</b>:<br><a href="#SP2_3">&#167;2.3</a>, <a href="#SP5">&#167;5</a>, <a href="#SP6">&#167;6</a>, <a href="#SP8">&#167;8</a></span></button></span><span class="plain">(</span><span class="constant">OUTPUT_STREAM</span><span class="plain">, </span><span class="reserved">int</span><span class="plain"> </span><span class="identifier">centred</span><span class="plain">) {</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">centred</span><span class="plain">) </span><span class="identifier">HTML_OPEN_WITH</span><span class="plain">(</span><span class="string">"table"</span><span class="plain">, </span><span class="string">"class=\"centredtable\""</span><span class="plain">)</span>
<span class="reserved">else</span><span class="plain"> </span><span class="identifier">HTML_OPEN</span><span class="plain">(</span><span class="string">"table"</span><span class="plain">);</span>
<span class="plain">}</span>
</pre>
<p class="inwebparagraph"></p>
<p class="inwebparagraph"><a id="SP10"></a><b>&#167;10. </b>This is a 2-column table: the link image in column 1, the text in column 2.
</p>
<pre class="display">
<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">Roadsign::roadsign_add_direction<button class="popup" onclick="togglePopup('usagePopup177')">...<span class="popuptext" id="usagePopup177">Usage of <b>Roadsign::roadsign_add_direction</b>:<br><a href="#SP2_3">&#167;2.3</a>, <a href="#SP5">&#167;5</a>, <a href="#SP6_1">&#167;6.1</a>, <a href="#SP6_2">&#167;6.2</a>, <a href="#SP8">&#167;8</a></span></button></span><span class="plain">(</span><span class="constant">OUTPUT_STREAM</span><span class="plain">, </span><span class="reserved">text_stream</span><span class="plain"> *</span><span class="identifier">icon</span><span class="plain">, </span><span class="reserved">text_stream</span><span class="plain"> *</span><span class="identifier">text</span><span class="plain">, </span><span class="reserved">text_stream</span><span class="plain"> *</span><span class="identifier">url</span><span class="plain">) {</span>
<span class="identifier">HTML_OPEN</span><span class="plain">(</span><span class="string">"tr"</span><span class="plain">);</span>
<span class="identifier">HTML_OPEN_WITH</span><span class="plain">(</span><span class="string">"td"</span><span class="plain">, </span><span class="string">"class=\"roadsigndirection\""</span><span class="plain">);</span>
<span class="functiontext"><a href="5-htm.html#SP15">HTML::begin_link_with_class</a></span><span class="plain">(</span><span class="identifier">OUT</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"standardlink"</span><span class="plain">, </span><span class="identifier">url</span><span class="plain">);</span>
<span class="functiontext"><a href="2-haj.html#SP13">HTMLUtilities::image_element</a></span><span class="plain">(</span><span class="identifier">OUT</span><span class="plain">, </span><span class="identifier">icon</span><span class="plain">);</span>
<span class="functiontext"><a href="5-htm.html#SP15">HTML::end_link</a></span><span class="plain">(</span><span class="identifier">OUT</span><span class="plain">);</span>
<span class="identifier">HTML_CLOSE</span><span class="plain">(</span><span class="string">"td"</span><span class="plain">);</span>
<span class="identifier">HTML_OPEN</span><span class="plain">(</span><span class="string">"td"</span><span class="plain">);</span>
<span class="functiontext"><a href="5-htm.html#SP15">HTML::begin_link_with_class</a></span><span class="plain">(</span><span class="identifier">OUT</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"standardlink"</span><span class="plain">, </span><span class="identifier">url</span><span class="plain">);</span>
<span class="identifier">WRITE</span><span class="plain">(</span><span class="string">"%S"</span><span class="plain">, </span><span class="identifier">text</span><span class="plain">);</span>
<span class="functiontext"><a href="5-htm.html#SP15">HTML::end_link</a></span><span class="plain">(</span><span class="identifier">OUT</span><span class="plain">);</span>
<span class="identifier">HTML_CLOSE</span><span class="plain">(</span><span class="string">"td"</span><span class="plain">);</span>
<span class="identifier">HTML_CLOSE</span><span class="plain">(</span><span class="string">"tr"</span><span class="plain">);</span>
<span class="plain">}</span>
</pre>
<p class="inwebparagraph"></p>
<p class="inwebparagraph"><a id="SP11"></a><b>&#167;11. </b></p>
<pre class="display">
<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">Roadsign::roadsign_end<button class="popup" onclick="togglePopup('usagePopup178')">...<span class="popuptext" id="usagePopup178">Usage of <b>Roadsign::roadsign_end</b>:<br><a href="#SP2_3">&#167;2.3</a>, <a href="#SP5">&#167;5</a>, <a href="#SP6">&#167;6</a>, <a href="#SP8">&#167;8</a></span></button></span><span class="plain">(</span><span class="constant">OUTPUT_STREAM</span><span class="plain">, </span><span class="reserved">int</span><span class="plain"> </span><span class="identifier">cent</span><span class="plain">) {</span>
<span class="identifier">HTML_CLOSE</span><span class="plain">(</span><span class="string">"table"</span><span class="plain">);</span>
<span class="plain">}</span>
</pre>
<p class="inwebparagraph"></p>
<p class="inwebparagraph"><a id="SP12"></a><b>&#167;12. Ecce romani. </b></p>
<pre class="display">
<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">Roadsign::roman_numeral<button class="popup" onclick="togglePopup('usagePopup179')">...<span class="popuptext" id="usagePopup179">Usage of <b>Roadsign::roman_numeral</b>:<br><a href="#SP2_1">&#167;2.1</a>, <a href="#SP2_3">&#167;2.3</a>, <a href="#SP5">&#167;5</a>, Codename Unsigned - <a href="4-cu.html#SP2_1">&#167;2.1</a></span></button></span><span class="plain">(</span><span class="constant">OUTPUT_STREAM</span><span class="plain">, </span><span class="reserved">int</span><span class="plain"> </span><span class="identifier">v</span><span class="plain">) {</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">v</span><span class="plain"> == </span><span class="constant">0</span><span class="plain">) </span><span class="identifier">WRITE</span><span class="plain">(</span><span class="string">"Part I. "</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">v</span><span class="plain"> == </span><span class="constant">1</span><span class="plain">) </span><span class="identifier">WRITE</span><span class="plain">(</span><span class="string">"Part II. "</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">v</span><span class="plain"> == </span><span class="constant">2</span><span class="plain">) </span><span class="identifier">WRITE</span><span class="plain">(</span><span class="string">"Part III. "</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">v</span><span class="plain"> == </span><span class="constant">3</span><span class="plain">) </span><span class="identifier">WRITE</span><span class="plain">(</span><span class="string">"Part IV. "</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">v</span><span class="plain"> == </span><span class="constant">4</span><span class="plain">) </span><span class="identifier">WRITE</span><span class="plain">(</span><span class="string">"Part V. "</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">v</span><span class="plain"> == </span><span class="constant">5</span><span class="plain">) </span><span class="identifier">WRITE</span><span class="plain">(</span><span class="string">"Part VI. "</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">v</span><span class="plain"> == </span><span class="constant">6</span><span class="plain">) </span><span class="identifier">WRITE</span><span class="plain">(</span><span class="string">"Part VII. "</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">v</span><span class="plain"> == </span><span class="constant">7</span><span class="plain">) </span><span class="identifier">WRITE</span><span class="plain">(</span><span class="string">"Part VIII. "</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">v</span><span class="plain"> == </span><span class="constant">8</span><span class="plain">) </span><span class="identifier">WRITE</span><span class="plain">(</span><span class="string">"Part IX. "</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">v</span><span class="plain"> == </span><span class="constant">9</span><span class="plain">) </span><span class="identifier">WRITE</span><span class="plain">(</span><span class="string">"Part X. "</span><span class="plain">);</span>
<span class="plain">}</span>
</pre>
<p class="inwebparagraph"></p>
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