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<title>Translation</title>
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<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../intern.html">Inter Modules</a></li><li><a href="index.html">building</a></li><li><a href="index.html#1">Chapter 1: Architecture</a></li><li><b>Translation</b></li></ul></div>
<p class="purpose">A way to express rules for how to translate names from the Inter namespace into the target language's namespace.</p>
<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>&#167;1. </b>The <a href="../final-module/index.html" class="internal">final</a> code-generator produces output code in a high-level language
which itself has identifier names. Clearly it is free to choose those names
however it would like; the process of going from an Inter name to a name in
the output is called "translation".
</p>
<p class="commentary">Each <a href="1-hl.html#SP1" class="internal">hierarchy_location</a> comes with a <a href="1-trn.html#SP1" class="internal">name_translation</a>, which specifies
how translation is to be done on the resource at this location. This might,
for example, express the idea "when code-generating, give this resource an
identifier name which is made by suffixing <span class="extract"><span class="extract-syntax">_X</span></span> after the name of an
associated resource". Or more commonly, just "give this resource the same
identifier name as its Inter symbol name".
</p>
<p class="commentary">A variety of stipulations can be made, and with memory consumption unimportant
here, the following is really a union: almost all the fields will be left blank.
</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">name_translation</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">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">translate_to</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">then_make_unique</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">inter_name_generator</span><span class="plain-syntax"> *</span><span class="identifier-syntax">name_generator</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">derive</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">by_imposition</span><span class="plain-syntax">;</span>
<span class="plain-syntax">} </span><span class="reserved-syntax">name_translation</span><span class="plain-syntax">;</span>
</pre>
<ul class="endnotetexts"><li>The structure name_translation is accessed in 1/hl and here.</li></ul>
<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>&#167;2. </b>"Make the translated name the same as the Inter identifier".
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">name_translation</span><span class="plain-syntax"> </span><span class="function-syntax">Translation::same</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">Translation::same</span></span>:<br/><a href="1-trn.html#SP3">&#167;3</a>, <a href="1-trn.html#SP4">&#167;4</a>, <a href="1-trn.html#SP5">&#167;5</a>, <a href="1-trn.html#SP6">&#167;6</a>, <a href="1-trn.html#SP7">&#167;7</a>, <a href="1-trn.html#SP8">&#167;8</a>, <a href="1-trn.html#SP9">&#167;9</a><br/>Hierarchy Locations - <a href="1-hl.html#SP1">&#167;1</a>, <a href="1-hl.html#SP3">&#167;3</a></span></button><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">name_translation</span><span class="plain-syntax"> </span><span class="identifier-syntax">nt</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">nt</span><span class="plain-syntax">.</span><span class="element-syntax">translate_to</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">nt</span><span class="plain-syntax">.</span><span class="element-syntax">then_make_unique</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">nt</span><span class="plain-syntax">.</span><span class="element-syntax">name_generator</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">nt</span><span class="plain-syntax">.</span><span class="element-syntax">derive</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">nt</span><span class="plain-syntax">.</span><span class="element-syntax">by_imposition</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">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">nt</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP3" class="paragraph-anchor"></a><b>&#167;3. </b>"Make the translated name the same as the Inter identifier, but then add
some numbers to ensure that the same identifier doesn't occur twice".
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">name_translation</span><span class="plain-syntax"> </span><span class="function-syntax">Translation::uniqued</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">name_translation</span><span class="plain-syntax"> </span><span class="identifier-syntax">nt</span><span class="plain-syntax"> = </span><a href="1-trn.html#SP2" class="function-link"><span class="function-syntax">Translation::same</span></a><span class="plain-syntax">();</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">nt</span><span class="plain-syntax">.</span><span class="element-syntax">then_make_unique</span><span class="plain-syntax"> = </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">nt</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP4" class="paragraph-anchor"></a><b>&#167;4. </b>"Make the translated name something specific which I will impose later,
and never mind the original Inter identifier".
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">name_translation</span><span class="plain-syntax"> </span><span class="function-syntax">Translation::imposed</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">name_translation</span><span class="plain-syntax"> </span><span class="identifier-syntax">nt</span><span class="plain-syntax"> = </span><a href="1-trn.html#SP2" class="function-link"><span class="function-syntax">Translation::same</span></a><span class="plain-syntax">();</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">nt</span><span class="plain-syntax">.</span><span class="element-syntax">by_imposition</span><span class="plain-syntax"> = </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">nt</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP5" class="paragraph-anchor"></a><b>&#167;5. </b>"Make the translated name this text I am supplying now, and never mind the
original Inter identifier".
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">name_translation</span><span class="plain-syntax"> </span><span class="function-syntax">Translation::to</span><span class="plain-syntax">(</span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">name_translation</span><span class="plain-syntax"> </span><span class="identifier-syntax">nt</span><span class="plain-syntax"> = </span><a href="1-trn.html#SP2" class="function-link"><span class="function-syntax">Translation::same</span></a><span class="plain-syntax">();</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">nt</span><span class="plain-syntax">.</span><span class="element-syntax">translate_to</span><span class="plain-syntax"> = </span><span class="identifier-syntax">S</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">nt</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP6" class="paragraph-anchor"></a><b>&#167;6. </b>"Make the translated name this text I am supplying now, but then add
some numbers to ensure that the same identifier doesn't occur twice".
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">name_translation</span><span class="plain-syntax"> </span><span class="function-syntax">Translation::to_uniqued</span><span class="plain-syntax">(</span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">name_translation</span><span class="plain-syntax"> </span><span class="identifier-syntax">nt</span><span class="plain-syntax"> = </span><a href="1-trn.html#SP2" class="function-link"><span class="function-syntax">Translation::same</span></a><span class="plain-syntax">();</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">nt</span><span class="plain-syntax">.</span><span class="element-syntax">translate_to</span><span class="plain-syntax"> = </span><span class="identifier-syntax">S</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">nt</span><span class="plain-syntax">.</span><span class="element-syntax">then_make_unique</span><span class="plain-syntax"> = </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">nt</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP7" class="paragraph-anchor"></a><b>&#167;7. </b>"Start with the original identifier, but then add <span class="extract"><span class="extract-syntax">S</span></span> as a prefix."
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">name_translation</span><span class="plain-syntax"> </span><span class="function-syntax">Translation::prefix</span><span class="plain-syntax">(</span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">name_translation</span><span class="plain-syntax"> </span><span class="identifier-syntax">nt</span><span class="plain-syntax"> = </span><a href="1-trn.html#SP2" class="function-link"><span class="function-syntax">Translation::same</span></a><span class="plain-syntax">();</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">nt</span><span class="plain-syntax">.</span><span class="element-syntax">name_generator</span><span class="plain-syntax"> = </span><a href="1-in.html#SP2" class="function-link"><span class="function-syntax">InterNames::multiple_use_generator</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</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">nt</span><span class="plain-syntax">.</span><span class="element-syntax">derive</span><span class="plain-syntax"> = </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">nt</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP8" class="paragraph-anchor"></a><b>&#167;8. </b>"Start with the original identifier, but then add <span class="extract"><span class="extract-syntax">S</span></span> as a suffix."
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">name_translation</span><span class="plain-syntax"> </span><span class="function-syntax">Translation::suffix</span><span class="plain-syntax">(</span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">name_translation</span><span class="plain-syntax"> </span><span class="identifier-syntax">nt</span><span class="plain-syntax"> = </span><a href="1-trn.html#SP2" class="function-link"><span class="function-syntax">Translation::same</span></a><span class="plain-syntax">();</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">nt</span><span class="plain-syntax">.</span><span class="element-syntax">name_generator</span><span class="plain-syntax"> = </span><a href="1-in.html#SP2" class="function-link"><span class="function-syntax">InterNames::multiple_use_generator</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">NULL</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">, </span><span class="identifier-syntax">S</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">nt</span><span class="plain-syntax">.</span><span class="element-syntax">derive</span><span class="plain-syntax"> = </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">nt</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP9" class="paragraph-anchor"></a><b>&#167;9. </b>"Generate a series of translated names from <span class="extract"><span class="extract-syntax">S</span></span> by adding sequence numbers,
and never mind the original Inter identifier".
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">name_translation</span><span class="plain-syntax"> </span><span class="function-syntax">Translation::generate</span><span class="plain-syntax">(</span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">name_translation</span><span class="plain-syntax"> </span><span class="identifier-syntax">nt</span><span class="plain-syntax"> = </span><a href="1-trn.html#SP2" class="function-link"><span class="function-syntax">Translation::same</span></a><span class="plain-syntax">();</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">nt</span><span class="plain-syntax">.</span><span class="element-syntax">name_generator</span><span class="plain-syntax"> = </span><a href="1-in.html#SP2" class="function-link"><span class="function-syntax">InterNames::multiple_use_generator</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">NULL</span><span class="plain-syntax">, </span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</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">nt</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
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