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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">building</a></li><li><a href="index.html#2">Chapter 2: Blueprints</a></li><li><b>Identifier Finders</b></li></ul></div>
<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>&#167;1. </b>Suppose we have an identifier name, say <span class="extract"><span class="extract-syntax">BlkValueCreate</span></span>, which we think
refers to some symbol in an Inter tree. How do we find it, coming up with
the right <span class="extract"><span class="extract-syntax">inter_symbol</span></span>?
</p>
<p class="commentary">The answer must depend on context, so the question really has to be "with
the conventions given by this <span class="extract"><span class="extract-syntax">identifier_finder</span></span>, what <span class="extract"><span class="extract-syntax">inter_symbol</span></span>
does this name correspond to?".
</p>
<pre class="definitions code-font"><span class="definition-keyword">define</span> <span class="constant-syntax">MAX_IDENTIFIER_PRIORITIES</span><span class="plain-syntax"> </span><span class="constant-syntax">3</span>
</pre>
<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">identifier_finder</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">no_priorities</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">inter_symbols_table</span><span class="plain-syntax"> *</span><span class="identifier-syntax">priorities</span><span class="plain-syntax">[</span><span class="constant-syntax">MAX_IDENTIFIER_PRIORITIES</span><span class="plain-syntax">];</span>
<span class="plain-syntax">} </span><span class="reserved-syntax">identifier_finder</span><span class="plain-syntax">;</span>
</pre>
<ul class="endnotetexts"><li>The structure identifier_finder is private to this section.</li></ul>
<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>&#167;2. </b>The most basic set of conventions only allows us to see names visible
everywhere:
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">identifier_finder</span><span class="plain-syntax"> </span><span class="function-syntax">IdentifierFinders::common_names_only</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">identifier_finder</span><span class="plain-syntax"> </span><span class="identifier-syntax">finder</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">finder</span><span class="plain-syntax">.</span><span class="identifier-syntax">no_priorities</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</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">finder</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>But we can add to that by providing up to three symbols tables to search
in preference order (first match wins):
</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">IdentifierFinders::next_priority</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">IdentifierFinders::next_priority</span></span>:<br/>Emitting Inter Schemas - <a href="2-eis.html#SP2_1_3">&#167;2.1.3</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">identifier_finder</span><span class="plain-syntax"> *</span><span class="identifier-syntax">finder</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">inter_symbols_table</span><span class="plain-syntax"> *</span><span class="identifier-syntax">where</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">finder</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">no_priorities</span><span class="plain-syntax"> &gt;= </span><span class="constant-syntax">MAX_IDENTIFIER_PRIORITIES</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">"too many identifier finder priorities"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">finder</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">priorities</span><span class="plain-syntax">[</span><span class="identifier-syntax">finder</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">no_priorities</span><span class="plain-syntax">++] = </span><span class="identifier-syntax">where</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>And here goes.
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="identifier-syntax">inter_symbol</span><span class="plain-syntax"> *</span><span class="function-syntax">IdentifierFinders::find</span><button class="popup" onclick="togglePopup('usagePopup2')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup2">Usage of <span class="code-font"><span class="function-syntax">IdentifierFinders::find</span></span>:<br/><a href="2-if.html#SP5">&#167;5</a><br/>Emitting Inter Schemas - <a href="2-eis.html#SP2_1_3">&#167;2.1.3</a>, <a href="2-eis.html#SP3_1_10_2">&#167;3.1.10.2</a>, <a href="2-eis.html#SP3_1_11_1">&#167;3.1.11.1</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">inter_tree</span><span class="plain-syntax"> *</span><span class="identifier-syntax">I</span><span class="plain-syntax">, </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">name</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">identifier_finder</span><span class="plain-syntax"> </span><span class="identifier-syntax">finder</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::get_at</span><span class="plain-syntax">(</span><span class="identifier-syntax">name</span><span class="plain-syntax">, </span><span class="constant-syntax">0</span><span class="plain-syntax">) == </span><span class="constant-syntax">0x00A7</span><span class="plain-syntax">)</span>
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="2-if.html#SP4_1" class="named-paragraph-link"><span class="named-paragraph">Interpret this as an absolute URL</span><span class="named-paragraph-number">4.1</span></a></span>
<span class="plain-syntax"> </span><span class="reserved-syntax">else</span>
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="2-if.html#SP4_2" class="named-paragraph-link"><span class="named-paragraph">Interpret this as an identifier</span><span class="named-paragraph-number">4.2</span></a></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">"Defeated on %S\n"</span><span class="plain-syntax">, </span><span class="identifier-syntax">name</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 find identifier"</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">NULL</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP4_1" class="paragraph-anchor"></a><b>&#167;4.1. </b>If the name begins with this magic character, we interpret it as an absolute
URL within the tree &mdash; the conventions are then unimportant: either the symbol
exists where we said it is, or nothing is found. And in that case we will
halt with an internal error: so this must be done speculatively.
</p>
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Interpret this as an absolute URL</span><span class="named-paragraph-number">4.1</span></span><span class="comment-syntax"> =</span>
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="plain-syntax"> </span><span class="identifier-syntax">TEMPORARY_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">SR</span><span class="plain-syntax">)</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Str::copy</span><span class="plain-syntax">(</span><span class="identifier-syntax">SR</span><span class="plain-syntax">, </span><span class="identifier-syntax">name</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Str::delete_first_character</span><span class="plain-syntax">(</span><span class="identifier-syntax">SR</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Str::delete_last_character</span><span class="plain-syntax">(</span><span class="identifier-syntax">SR</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">inter_symbol</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax"> = </span><span class="identifier-syntax">InterSymbolsTable::URL_to_symbol</span><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">, </span><span class="identifier-syntax">SR</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">SR</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">S</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">S</span><span class="plain-syntax">;</span>
</pre>
<ul class="endnotetexts"><li>This code is used in <a href="2-if.html#SP4">&#167;4</a>.</li></ul>
<p class="commentary firstcommentary"><a id="SP4_2" class="paragraph-anchor"></a><b>&#167;4.2. </b>Here, though, if all attempts to find the identifier fail, we in effect
force it to exist by creating a plug with this name, and then returning that.
So the above internal error cannot occur.
</p>
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Interpret this as an identifier</span><span class="named-paragraph-number">4.2</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">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">; </span><span class="identifier-syntax">i</span><span class="plain-syntax"> &lt; </span><span class="identifier-syntax">finder</span><span class="plain-syntax">.</span><span class="element-syntax">no_priorities</span><span class="plain-syntax">; </span><span class="identifier-syntax">i</span><span class="plain-syntax">++) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">inter_symbol</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax"> = </span><span class="identifier-syntax">InterSymbolsTable::symbol_from_name</span><span class="plain-syntax">(</span><span class="identifier-syntax">finder</span><span class="plain-syntax">.</span><span class="element-syntax">priorities</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">], </span><span class="identifier-syntax">name</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">S</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">S</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">inter_symbol</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax"> = </span><a href="1-ls.html#SP8" class="function-link"><span class="function-syntax">LargeScale::find_architectural_symbol</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">, </span><span class="identifier-syntax">name</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">S</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</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">S</span><span class="plain-syntax"> = </span><span class="identifier-syntax">InterSymbolsTable::symbol_from_name</span><span class="plain-syntax">(</span><a href="1-ls.html#SP6" class="function-link"><span class="function-syntax">LargeScale::connectors_scope</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">), </span><span class="identifier-syntax">name</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">S</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</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">S</span><span class="plain-syntax"> = </span><span class="identifier-syntax">InterSymbolsTable::symbol_from_name</span><span class="plain-syntax">(</span><a href="1-ls.html#SP4" class="function-link"><span class="function-syntax">LargeScale::main_scope</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">), </span><span class="identifier-syntax">name</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">S</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</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">S</span><span class="plain-syntax"> = </span><a href="1-in.html#SP9" class="function-link"><span class="function-syntax">InterNames::to_symbol</span></a><span class="plain-syntax">(</span><a href="1-hl.html#SP20" class="function-link"><span class="function-syntax">HierarchyLocations::find_by_name</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">, </span><span class="identifier-syntax">name</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">S</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">S</span><span class="plain-syntax">;</span>
</pre>
<ul class="endnotetexts"><li>This code is used in <a href="2-if.html#SP4">&#167;4</a>.</li></ul>
<p class="commentary firstcommentary"><a id="SP5" class="paragraph-anchor"></a><b>&#167;5. </b>A small variation. Note that a token can be marked explicitly with an iname
to which it corresponds; if it has been, then this overrides the finding process,
because the symbol which that iname incarnates as must be the right one.
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="identifier-syntax">inter_symbol</span><span class="plain-syntax"> *</span><span class="function-syntax">IdentifierFinders::find_token</span><button class="popup" onclick="togglePopup('usagePopup3')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup3">Usage of <span class="code-font"><span class="function-syntax">IdentifierFinders::find_token</span></span>:<br/>Emitting Inter Schemas - <a href="2-eis.html#SP3_1_2_1">&#167;3.1.2.1</a>, <a href="2-eis.html#SP3_1_7_2">&#167;3.1.7.2</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">inter_tree</span><span class="plain-syntax"> *</span><span class="identifier-syntax">I</span><span class="plain-syntax">, </span><span class="reserved-syntax">inter_schema_token</span><span class="plain-syntax"> *</span><span class="identifier-syntax">t</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">identifier_finder</span><span class="plain-syntax"> </span><span class="identifier-syntax">finder</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">t</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">as_quoted</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="1-in.html#SP9" class="function-link"><span class="function-syntax">InterNames::to_symbol</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">t</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">as_quoted</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> #</span><span class="identifier-syntax">ifdef</span><span class="plain-syntax"> </span><span class="identifier-syntax">CORE_MODULE</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">local_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">lvar</span><span class="plain-syntax"> = </span><span class="identifier-syntax">LocalVariables::by_identifier</span><span class="plain-syntax">(</span><span class="identifier-syntax">t</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">material</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">lvar</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">LocalVariables::declare</span><span class="plain-syntax">(</span><span class="identifier-syntax">lvar</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> #</span><span class="identifier-syntax">endif</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="2-if.html#SP4" class="function-link"><span class="function-syntax">IdentifierFinders::find</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">, </span><span class="identifier-syntax">t</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">material</span><span class="plain-syntax">, </span><span class="identifier-syntax">finder</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
</pre>
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