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<h1><a href="../index.html">
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<ul><li><a href="../index.html">home</a></li>
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</ul><h2>Compiler</h2><ul>
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<li><a href="../structure.html">structure</a></li>
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</ul><h2>Other Tools</h2><ul>
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<li><a href="../inblorbn.html">inblorb</a></li>
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</ul><h2>Related Projects</h2><ul>
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<li><a href="../../../inweb/index.html">inweb</a></li>
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<li><a href="../../../intest/index.html">intest</a></li>
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</ul>
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<main role="main">
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<!--Weave of 'Source Links' generated by Inweb-->
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<div class="breadcrumbs">
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<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../services.html">Services</a></li><li><a href="index.html">html</a></li><li><a href="index.html#2">Chapter 2: Intranet</a></li><li><b>Source Links</b></li></ul></div>
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<p class="purpose">To provide HTML links to an Inform source text, using the non-standard "source" protocol.</p>
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. </b>Index and Problem pages generated by <a href="../inform7/index.html" class="internal">inform7</a>, via the <a href="../index-module/index.html" class="internal">index</a> and
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<a href="../problems-module/index.html" class="internal">problems</a> modules, frequently need to have clickable icons linking to
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positions in the source text; when these are clicked in the Inform UI
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applications, the Source panel opens at the appropriate line.
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</p>
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<p class="commentary">This is done with a non-standard HTML protocol called <span class="extract"><span class="extract-syntax">source:</span></span>, one of
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two which the Inform UI apps must provide special handling for. For instance,
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line 21 of file <span class="extract"><span class="extract-syntax">Bits and Pieces/marbles.txt</span></span> has URL:
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="plain-syntax"> source:Bits and Pieces/marbles.txt#line14</span>
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</pre>
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<p class="commentary">When an Inform app is viewing an extension project, there can also be
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references to individual examples in that extension, and these are referred
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to as "cases" since they are test cases when the app is testing the extension.
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For example,
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="plain-syntax"> source:Locksmith.i7x?case=B#line7</span>
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</pre>
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<p class="commentary">refers to line 7 of Example B of <span class="extract"><span class="extract-syntax">Locksmith.i7x</span></span>.
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</p>
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<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>§2. </b>Locations are given relative to the current project bundle. However, if
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only a leafname is supplied, then this is read as a file within the <span class="extract"><span class="extract-syntax">Source</span></span>
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subfolder of the project bundle. (Thus it is not possible to have a
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source link to a source file at the root of the project bundle: but this is
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no loss, since source is not allowed to be kept there.) For instance,
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line 14 of file <span class="extract"><span class="extract-syntax">Source/story.ni</span></span> has URL
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="plain-syntax"> source:story.ni#line14</span>
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</pre>
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<p class="commentary">The following routine writes the clickable source-reference icon, and
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is the only place in Inform where <span class="extract"><span class="extract-syntax">source:</span></span> URLs are generated.
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="identifier-syntax">wchar_t</span><span class="plain-syntax"> </span><span class="identifier-syntax">source_link_case</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">SourceLinks::set_case</span><span class="plain-syntax">(</span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">p</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">source_link_case</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Characters::toupper</span><span class="plain-syntax">(</span><span class="identifier-syntax">Str::get_first_char</span><span class="plain-syntax">(</span><span class="identifier-syntax">p</span><span class="plain-syntax">));</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">SourceLinks::link</span><span class="plain-syntax">(</span><span class="identifier-syntax">OUTPUT_STREAM</span><span class="plain-syntax">, </span><span class="identifier-syntax">source_location</span><span class="plain-syntax"> </span><span class="identifier-syntax">sl</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">nonbreaking_space</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">sl</span><span class="plain-syntax">.</span><span class="identifier-syntax">file_of_origin</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">TEMPORARY_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">fn</span><span class="plain-syntax">)</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">fn</span><span class="plain-syntax">, </span><span class="string-syntax">"%f"</span><span class="plain-syntax">, </span><span class="identifier-syntax">TextFromFiles::get_filename</span><span class="plain-syntax">(</span><span class="identifier-syntax">sl</span><span class="plain-syntax">.</span><span class="identifier-syntax">file_of_origin</span><span class="plain-syntax">));</span>
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<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="2-sl.html#SP2_1" class="named-paragraph-link"><span class="named-paragraph">Truncate the path according to the current abbreviation</span><span class="named-paragraph-number">2.1</span></a></span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="2-sl.html#SP2_2" class="named-paragraph-link"><span class="named-paragraph">Remove indication that the path is inside the Source directory</span><span class="named-paragraph-number">2.2</span></a></span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">nonbreaking_space</span><span class="plain-syntax">) </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"&nbsp;"</span><span class="plain-syntax">); </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">" "</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">source_link_case</span><span class="plain-syntax">)</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">HTML_OPEN_WITH</span><span class="plain-syntax">(</span><span class="string-syntax">"a"</span><span class="plain-syntax">, </span><span class="string-syntax">"href=\"source:%S?case=%c#line%d\""</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">fn</span><span class="plain-syntax">, </span><span class="identifier-syntax">source_link_case</span><span class="plain-syntax">, </span><span class="identifier-syntax">sl</span><span class="plain-syntax">.</span><span class="identifier-syntax">line_number</span><span class="plain-syntax">)</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">else</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">HTML_OPEN_WITH</span><span class="plain-syntax">(</span><span class="string-syntax">"a"</span><span class="plain-syntax">, </span><span class="string-syntax">"href=\"source:%S#line%d\""</span><span class="plain-syntax">, </span><span class="identifier-syntax">fn</span><span class="plain-syntax">, </span><span class="identifier-syntax">sl</span><span class="plain-syntax">.</span><span class="identifier-syntax">line_number</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">HTML_TAG_WITH</span><span class="plain-syntax">(</span><span class="string-syntax">"img"</span><span class="plain-syntax">, </span><span class="string-syntax">"border=0 src=inform:/doc_images/Reveal.png"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">HTML_CLOSE</span><span class="plain-syntax">(</span><span class="string-syntax">"a"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">DISCARD_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">fn</span><span class="plain-syntax">)</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP2_1" class="paragraph-anchor"></a><b>§2.1. </b>This rather clumsily simplifies links to make them relative.
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</p>
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<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Truncate the path according to the current abbreviation</span><span class="named-paragraph-number">2.1</span></span><span class="comment-syntax"> =</span>
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="plain-syntax"> </span><span class="identifier-syntax">pathname</span><span class="plain-syntax"> *</span><span class="identifier-syntax">abbrev</span><span class="plain-syntax"> = </span><span class="identifier-syntax">HTML::get_link_abbreviation_path</span><span class="plain-syntax">();</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">abbrev</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">TEMPORARY_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">pp</span><span class="plain-syntax">)</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">pp</span><span class="plain-syntax">, </span><span class="string-syntax">"%p"</span><span class="plain-syntax">, </span><span class="identifier-syntax">abbrev</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">N</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Str::len</span><span class="plain-syntax">(</span><span class="identifier-syntax">pp</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Str::prefix_eq</span><span class="plain-syntax">(</span><span class="identifier-syntax">fn</span><span class="plain-syntax">, </span><span class="identifier-syntax">pp</span><span class="plain-syntax">, </span><span class="identifier-syntax">N</span><span class="plain-syntax">)) </span><span class="identifier-syntax">Str::delete_n_characters</span><span class="plain-syntax">(</span><span class="identifier-syntax">fn</span><span class="plain-syntax">, </span><span class="identifier-syntax">N</span><span class="plain-syntax">+1);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">DISCARD_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">pp</span><span class="plain-syntax">)</span>
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<span class="plain-syntax"> }</span>
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</pre>
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<ul class="endnotetexts"><li>This code is used in <a href="2-sl.html#SP2">§2</a>.</li></ul>
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<p class="commentary firstcommentary"><a id="SP2_2" class="paragraph-anchor"></a><b>§2.2. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Remove indication that the path is inside the Source directory</span><span class="named-paragraph-number">2.2</span></span><span class="comment-syntax"> =</span>
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">Str::begins_with_wide_string</span><span class="plain-syntax">(</span><span class="identifier-syntax">fn</span><span class="plain-syntax">, </span><span class="identifier-syntax">L</span><span class="string-syntax">"Source"</span><span class="plain-syntax">)) &&</span>
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<span class="plain-syntax"> (</span><span class="identifier-syntax">Platform::is_folder_separator</span><span class="plain-syntax">(</span><span class="identifier-syntax">Str::get_at</span><span class="plain-syntax">(</span><span class="identifier-syntax">fn</span><span class="plain-syntax">, </span><span class="constant-syntax">6</span><span class="plain-syntax">))))</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Str::delete_n_characters</span><span class="plain-syntax">(</span><span class="identifier-syntax">fn</span><span class="plain-syntax">, </span><span class="constant-syntax">7</span><span class="plain-syntax">);</span>
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</pre>
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<ul class="endnotetexts"><li>This code is used in <a href="2-sl.html#SP2">§2</a>.</li></ul>
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