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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../compiler.html">Inter Modules</a></li><li><a href="index.html">index</a></li><li><a href="index.html#2">Chapter 2: Utilities</a></li><li><b>Localisation</b></li></ul></div>
<p class="purpose">Utility functions for standing text which may vary by language.</p>
<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>&#167;1. </b></p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">typedef</span><span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">localisation_dictionary</span><span class="plain-syntax"> {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">dictionary</span><span class="plain-syntax"> *</span><span class="identifier-syntax">texts</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">CLASS_DEFINITION</span>
<span class="plain-syntax">} </span><span class="reserved-syntax">localisation_dictionary</span><span class="plain-syntax">;</span>
<span class="reserved-syntax">localisation_dictionary</span><span class="plain-syntax"> *</span><span class="function-syntax">Localisation::new</span><span class="plain-syntax">(</span><span class="reserved-syntax">void</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">localisation_dictionary</span><span class="plain-syntax"> *</span><span class="identifier-syntax">D</span><span class="plain-syntax"> = </span><span class="identifier-syntax">CREATE</span><span class="plain-syntax">(</span><span class="reserved-syntax">localisation_dictionary</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">D</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">texts</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Dictionaries::new</span><span class="plain-syntax">(32, </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">D</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
<span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="function-syntax">Localisation::read</span><button class="popup" onclick="togglePopup('usagePopup1')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup1">Usage of <span class="code-font"><span class="function-syntax">Localisation::read</span></span>:<br/>Index Interpreter - <a href="2-ii.html#SP2">&#167;2</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">localisation_dictionary</span><span class="plain-syntax"> *</span><span class="identifier-syntax">D</span><span class="plain-syntax">, </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">context</span><span class="plain-syntax">, </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">key</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">TEMPORARY_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">true_key</span><span class="plain-syntax">)</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">true_key</span><span class="plain-syntax">, </span><span class="string-syntax">"%S-%S"</span><span class="plain-syntax">, </span><span class="identifier-syntax">context</span><span class="plain-syntax">, </span><span class="identifier-syntax">key</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">text</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Dictionaries::get_text</span><span class="plain-syntax">(</span><span class="identifier-syntax">D</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">texts</span><span class="plain-syntax">, </span><span class="identifier-syntax">true_key</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">DISCARD_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">true_key</span><span class="plain-syntax">)</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">text</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
<ul class="endnotetexts"><li>The structure localisation_dictionary is private to this section.</li></ul>
<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>&#167;2. </b>Here we read a localisation file for text used in the Index elements, and write
this into a given dictionary of key-value pairs.
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Localisation::stock_from_file</span><span class="plain-syntax">(</span><span class="identifier-syntax">filename</span><span class="plain-syntax"> *</span><span class="identifier-syntax">localisation_file</span><span class="plain-syntax">, </span><span class="reserved-syntax">localisation_dictionary</span><span class="plain-syntax"> *</span><span class="identifier-syntax">D</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">FILE</span><span class="plain-syntax"> *</span><span class="identifier-syntax">Input_File</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Filenames::fopen</span><span class="plain-syntax">(</span><span class="identifier-syntax">localisation_file</span><span class="plain-syntax">, </span><span class="string-syntax">"r"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Input_File</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">LOG</span><span class="plain-syntax">(</span><span class="string-syntax">"Filename was %f\n"</span><span class="plain-syntax">, </span><span class="identifier-syntax">localisation_file</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"unable to open localisation file for the index"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">col</span><span class="plain-syntax"> = </span><span class="constant-syntax">1</span><span class="plain-syntax">, </span><span class="identifier-syntax">cr</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">TEMPORARY_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">super_key</span><span class="plain-syntax">)</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">TEMPORARY_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">key</span><span class="plain-syntax">)</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">TEMPORARY_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">value</span><span class="plain-syntax">)</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">do</span><span class="plain-syntax"> {</span>
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="2-lcl.html#SP2_1" class="named-paragraph-link"><span class="named-paragraph">Read next character from localisation stream</span><span class="named-paragraph-number">2.1</span></a></span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">cr</span><span class="plain-syntax"> == </span><span class="identifier-syntax">EOF</span><span class="plain-syntax">) </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">cr</span><span class="plain-syntax"> == </span><span class="character-syntax">'%'</span><span class="plain-syntax">) </span><span class="named-paragraph-container code-font"><a href="2-lcl.html#SP2_2" class="named-paragraph-link"><span class="named-paragraph">Read up to the next white space as a key</span><span class="named-paragraph-number">2.2</span></a></span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">cr</span><span class="plain-syntax"> == </span><span class="identifier-syntax">EOF</span><span class="plain-syntax">) </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Str::len</span><span class="plain-syntax">(</span><span class="identifier-syntax">key</span><span class="plain-syntax">) &gt; </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="identifier-syntax">PUT_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">value</span><span class="plain-syntax">, </span><span class="identifier-syntax">cr</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> } </span><span class="reserved-syntax">while</span><span class="plain-syntax"> (</span><span class="identifier-syntax">cr</span><span class="plain-syntax"> != </span><span class="identifier-syntax">EOF</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Str::len</span><span class="plain-syntax">(</span><span class="identifier-syntax">key</span><span class="plain-syntax">) &gt; </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="named-paragraph-container code-font"><a href="2-lcl.html#SP2_3" class="named-paragraph-link"><span class="named-paragraph">Write key-value pair</span><span class="named-paragraph-number">2.3</span></a></span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">DISCARD_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">super_key</span><span class="plain-syntax">)</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">DISCARD_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">key</span><span class="plain-syntax">)</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">DISCARD_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">value</span><span class="plain-syntax">)</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">fclose</span><span class="plain-syntax">(</span><span class="identifier-syntax">Input_File</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP2_1" class="paragraph-anchor"></a><b>&#167;2.1. </b>Localisation files are encoded as ISO Latin-1, not as Unicode UTF-8, so
ordinary <span class="extract"><span class="extract-syntax">fgetc</span></span> is used, and no BOM marker is parsed. Lines are assumed
to be terminated with either <span class="extract"><span class="extract-syntax">0x0a</span></span> or <span class="extract"><span class="extract-syntax">0x0d</span></span>. (Since blank lines are
harmless, we take no trouble over <span class="extract"><span class="extract-syntax">0a0d</span></span> or <span class="extract"><span class="extract-syntax">0d0a</span></span> combinations.)
</p>
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Read next character from localisation stream</span><span class="named-paragraph-number">2.1</span></span><span class="comment-syntax"> =</span>
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Input_File</span><span class="plain-syntax">) </span><span class="identifier-syntax">cr</span><span class="plain-syntax"> = </span><span class="identifier-syntax">fgetc</span><span class="plain-syntax">(</span><span class="identifier-syntax">Input_File</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="identifier-syntax">cr</span><span class="plain-syntax"> = </span><span class="identifier-syntax">EOF</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">col</span><span class="plain-syntax">++; </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">cr</span><span class="plain-syntax"> == </span><span class="constant-syntax">10</span><span class="plain-syntax">) || (</span><span class="identifier-syntax">cr</span><span class="plain-syntax"> == </span><span class="constant-syntax">13</span><span class="plain-syntax">)) </span><span class="identifier-syntax">col</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
</pre>
<ul class="endnotetexts"><li>This code is used in <a href="2-lcl.html#SP2">&#167;2</a>, <a href="2-lcl.html#SP2_2">&#167;2.2</a> (twice).</li></ul>
<p class="commentary firstcommentary"><a id="SP2_2" class="paragraph-anchor"></a><b>&#167;2.2. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Read up to the next white space as a key</span><span class="named-paragraph-number">2.2</span></span><span class="comment-syntax"> =</span>
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Str::len</span><span class="plain-syntax">(</span><span class="identifier-syntax">key</span><span class="plain-syntax">) &gt; </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="named-paragraph-container code-font"><a href="2-lcl.html#SP2_3" class="named-paragraph-link"><span class="named-paragraph">Write key-value pair</span><span class="named-paragraph-number">2.3</span></a></span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Str::clear</span><span class="plain-syntax">(</span><span class="identifier-syntax">key</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Str::clear</span><span class="plain-syntax">(</span><span class="identifier-syntax">value</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">double_mode</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">while</span><span class="plain-syntax"> (</span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="2-lcl.html#SP2_1" class="named-paragraph-link"><span class="named-paragraph">Read next character from localisation stream</span><span class="named-paragraph-number">2.1</span></a></span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">cr</span><span class="plain-syntax"> == </span><span class="character-syntax">'%'</span><span class="plain-syntax">) &amp;&amp; (</span><span class="identifier-syntax">Str::len</span><span class="plain-syntax">(</span><span class="identifier-syntax">key</span><span class="plain-syntax">) == </span><span class="constant-syntax">0</span><span class="plain-syntax">)) { </span><span class="identifier-syntax">double_mode</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">; </span><span class="reserved-syntax">continue</span><span class="plain-syntax">; }</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">cr</span><span class="plain-syntax"> == </span><span class="character-syntax">'='</span><span class="plain-syntax">) || (</span><span class="identifier-syntax">cr</span><span class="plain-syntax"> == </span><span class="identifier-syntax">EOF</span><span class="plain-syntax">)) </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Characters::is_whitespace</span><span class="plain-syntax">(</span><span class="identifier-syntax">cr</span><span class="plain-syntax">)) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">double_mode</span><span class="plain-syntax">) </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">continue</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">PUT_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">key</span><span class="plain-syntax">, </span><span class="identifier-syntax">cr</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">double_mode</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Str::clear</span><span class="plain-syntax">(</span><span class="identifier-syntax">super_key</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">super_key</span><span class="plain-syntax">, </span><span class="string-syntax">"%S"</span><span class="plain-syntax">, </span><span class="identifier-syntax">key</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Str::clear</span><span class="plain-syntax">(</span><span class="identifier-syntax">key</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">cr</span><span class="plain-syntax"> == </span><span class="character-syntax">'='</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">while</span><span class="plain-syntax"> (</span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="2-lcl.html#SP2_1" class="named-paragraph-link"><span class="named-paragraph">Read next character from localisation stream</span><span class="named-paragraph-number">2.1</span></a></span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Characters::is_whitespace</span><span class="plain-syntax">(</span><span class="identifier-syntax">cr</span><span class="plain-syntax">)) </span><span class="reserved-syntax">continue</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax"> }</span>
</pre>
<ul class="endnotetexts"><li>This code is used in <a href="2-lcl.html#SP2">&#167;2</a>.</li></ul>
<p class="commentary firstcommentary"><a id="SP2_3" class="paragraph-anchor"></a><b>&#167;2.3. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Write key-value pair</span><span class="named-paragraph-number">2.3</span></span><span class="comment-syntax"> =</span>
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="plain-syntax"> </span><span class="identifier-syntax">TEMPORARY_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">true_key</span><span class="plain-syntax">)</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">true_key</span><span class="plain-syntax">, </span><span class="string-syntax">"%S-%S"</span><span class="plain-syntax">, </span><span class="identifier-syntax">super_key</span><span class="plain-syntax">, </span><span class="identifier-syntax">key</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">to</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Dictionaries::create_text</span><span class="plain-syntax">(</span><span class="identifier-syntax">D</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">texts</span><span class="plain-syntax">, </span><span class="identifier-syntax">true_key</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Str::trim_white_space</span><span class="plain-syntax">(</span><span class="identifier-syntax">value</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Str::trim_all_white_space_at_end</span><span class="plain-syntax">(</span><span class="identifier-syntax">value</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">to</span><span class="plain-syntax">, </span><span class="string-syntax">"%S"</span><span class="plain-syntax">, </span><span class="identifier-syntax">value</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">DISCARD_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">true_key</span><span class="plain-syntax">)</span>
</pre>
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