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<li><a href="index.html"><span class="selectedlink">words</span></a></li>
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<main role="main">
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<!--Weave of 'Preform' 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="../compiler.html">Shared Modules</a></li><li><a href="index.html">words</a></li><li><a href="index.html#4">Chapter 4: Parsing</a></li><li><b>Preform</b></li></ul></div>
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<p class="purpose">To parse the word stream against a general grammar defined by Preform.</p>
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<ul class="toc"><li><a href="4-prf.html#SP1">§1. Parsing</a></li></ul><hr class="tocbar">
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<p class="commentary firstcommentary"><a id="SP1"></a><b>§1. Parsing. </b>Speed is important in the following
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code, but not critical: I optimised it until profiling showed that Inform spent
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only about 6\% of its time here.
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">ptraci</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">; </span><span class="comment-syntax"> in this mode, we trace parsing to the debugging log</span>
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<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">preform_lookahead_mode</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">; </span><span class="comment-syntax"> in this mode, we are looking ahead</span>
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<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">fail_nonterminal_quantum</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">; </span><span class="comment-syntax"> jump forward by this many words in lookahead</span>
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<span class="reserved-syntax">void</span><span class="plain-syntax"> *</span><span class="identifier-syntax">preform_backtrack</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">; </span><span class="comment-syntax"> position to backtrack from in voracious internal</span>
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<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">Preform::parse_nt_against_word_range</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">Preform::parse_nt_against_word_range</span></span>:<br/><a href="4-prf.html#SP1_2_1_2_3_3_5">§1.2.1.2.3.3.5</a>, <a href="4-prf.html#SP1_2_1_2_3_3_3_1">§1.2.1.2.3.3.3.1</a>, <a href="4-prf.html#SP2">§2</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">nonterminal</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nt</span><span class="plain-syntax">, </span><span class="reserved-syntax">wording</span><span class="plain-syntax"> </span><span class="identifier-syntax">W</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> *</span><span class="identifier-syntax">result</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">void</span><span class="plain-syntax"> **</span><span class="identifier-syntax">result_p</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">time_t</span><span class="plain-syntax"> </span><span class="identifier-syntax">start_of_nt</span><span class="plain-syntax"> = </span><span class="identifier-syntax">time</span><span class="plain-syntax">(0);</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">nt</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"can't parse a null nonterminal"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> #</span><span class="identifier-syntax">ifdef</span><span class="plain-syntax"> </span><span class="identifier-syntax">INSTRUMENTED_PREFORM</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">nt</span><span class="plain-syntax">-></span><span class="element-syntax">nonterminal_tries</span><span class="plain-syntax">++;</span>
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<span class="plain-syntax"> #</span><span class="identifier-syntax">endif</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">success_rval</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">; </span><span class="comment-syntax"> what to return in the event of a successful match</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">fail_nonterminal_quantum</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</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">teppic</span><span class="plain-syntax"> = </span><span class="identifier-syntax">ptraci</span><span class="plain-syntax">; </span><span class="comment-syntax"> Teppic saves Ptraci</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">ptraci</span><span class="plain-syntax"> = </span><span class="identifier-syntax">nt</span><span class="plain-syntax">-></span><span class="element-syntax">watched</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">ptraci</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">preform_lookahead_mode</span><span class="plain-syntax">) </span><span class="identifier-syntax">ptraci</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="identifier-syntax">LOG</span><span class="plain-syntax">(</span><span class="string-syntax">"%V: <%W>\n"</span><span class="plain-syntax">, </span><span class="identifier-syntax">nt</span><span class="plain-syntax">-></span><span class="element-syntax">nonterminal_id</span><span class="plain-syntax">, </span><span class="identifier-syntax">W</span><span class="plain-syntax">);</span>
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<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">input_length</span><span class="plain-syntax"> = </span><a href="3-wrd.html#SP8" class="function-link"><span class="function-syntax">Wordings::length</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">W</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">nt</span><span class="plain-syntax">-></span><span class="identifier-syntax">max_nt_words</span><span class="plain-syntax"> == </span><span class="constant-syntax">0</span><span class="plain-syntax">) ||</span>
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<span class="plain-syntax"> ((</span><span class="identifier-syntax">input_length</span><span class="plain-syntax"> >= </span><span class="identifier-syntax">nt</span><span class="plain-syntax">-></span><span class="element-syntax">min_nt_words</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">input_length</span><span class="plain-syntax"> <= </span><span class="identifier-syntax">nt</span><span class="plain-syntax">-></span><span class="identifier-syntax">max_nt_words</span><span class="plain-syntax">))) {</span>
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<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="4-prf.html#SP1_2" class="named-paragraph-link"><span class="named-paragraph">Try to match the input text to the nonterminal</span><span class="named-paragraph-number">1.2</span></a></span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="4-prf.html#SP1_1" class="named-paragraph-link"><span class="named-paragraph">The nonterminal has failed to parse</span><span class="named-paragraph-number">1.1</span></a></span><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="SP1_1"></a><b>§1.1. </b>The routine ends here...
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</p>
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<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">The nonterminal has failed to parse</span><span class="named-paragraph-number">1.1</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="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">ptraci</span><span class="plain-syntax">) </span><span class="identifier-syntax">LOG</span><span class="plain-syntax">(</span><span class="string-syntax">"Failed %V (time %d)\n"</span><span class="plain-syntax">, </span><span class="identifier-syntax">nt</span><span class="plain-syntax">-></span><span class="element-syntax">nonterminal_id</span><span class="plain-syntax">, </span><span class="identifier-syntax">time</span><span class="plain-syntax">(0)-</span><span class="identifier-syntax">start_of_nt</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">ptraci</span><span class="plain-syntax"> = </span><span class="identifier-syntax">teppic</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">FALSE</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="4-prf.html#SP1">§1</a>, <a href="4-prf.html#SP1_2_1_2_1">§1.2.1.2.1</a>.</li></ul>
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<p class="commentary firstcommentary"><a id="SP_1"></a><b>§.1. </b>...unless a match was made, in which case it ends here. At this point <span class="extract"><span class="extract-syntax">Q</span></span>
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and <span class="extract"><span class="extract-syntax">QP</span></span> will hold the results of the match.
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</p>
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<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">The nonterminal has successfully parsed</span><span class="named-paragraph-number">.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="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">result</span><span class="plain-syntax">) *</span><span class="identifier-syntax">result</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Q</span><span class="plain-syntax">; </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">result_p</span><span class="plain-syntax">) *</span><span class="identifier-syntax">result_p</span><span class="plain-syntax"> = </span><span class="identifier-syntax">QP</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">most_recent_result</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Q</span><span class="plain-syntax">; </span><span class="identifier-syntax">most_recent_result_p</span><span class="plain-syntax"> = </span><span class="identifier-syntax">QP</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> #</span><span class="identifier-syntax">ifdef</span><span class="plain-syntax"> </span><span class="identifier-syntax">INSTRUMENTED_PREFORM</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">nt</span><span class="plain-syntax">-></span><span class="element-syntax">nonterminal_matches</span><span class="plain-syntax">++;</span>
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<span class="plain-syntax"> #</span><span class="identifier-syntax">endif</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">ptraci</span><span class="plain-syntax"> = </span><span class="identifier-syntax">teppic</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">success_rval</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="4-prf.html#SP1_2">§1.2</a> (twice), <a href="4-prf.html#SP1_2_1">§1.2.1</a>.</li></ul>
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<p class="commentary firstcommentary"><a id="SP1_2"></a><b>§1.2. </b>Here we see that a successful voracious NT returns the word number it got
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to, rather than <span class="extract"><span class="extract-syntax">TRUE</span></span>. Otherwise this is straightforward: we delegate to
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an internal NT, or try all possible productions for an external one.
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</p>
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<pre class="definitions code-font"><span class="definition-keyword">define</span> <span class="constant-syntax">RANGE_OPTIMISATION_LENGTH</span><span class="plain-syntax"> </span><span class="constant-syntax">10</span>
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</pre>
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<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Try to match the input text to the nonterminal</span><span class="named-paragraph-number">1.2</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">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">unoptimised</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</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><a href="3-wrd.html#SP12" class="function-link"><span class="function-syntax">Wordings::empty</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">)) || (</span><span class="identifier-syntax">input_length</span><span class="plain-syntax"> >= </span><span class="constant-syntax">RANGE_OPTIMISATION_LENGTH</span><span class="plain-syntax">))</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">unoptimised</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</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">nt</span><span class="plain-syntax">-></span><span class="element-syntax">internal_definition</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">nt</span><span class="plain-syntax">-></span><span class="element-syntax">voracious</span><span class="plain-syntax">) </span><span class="identifier-syntax">unoptimised</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</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">unoptimised</span><span class="plain-syntax">) || (</span><a href="4-to.html#SP5" class="function-link"><span class="function-syntax">Optimiser::nt_bitmap_violates</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">, &(</span><span class="identifier-syntax">nt</span><span class="plain-syntax">-></span><span class="element-syntax">nonterminal_req</span><span class="plain-syntax">)) == </span><span class="identifier-syntax">FALSE</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">r</span><span class="plain-syntax">, </span><span class="identifier-syntax">Q</span><span class="plain-syntax">; </span><span class="reserved-syntax">void</span><span class="plain-syntax"> *</span><span class="identifier-syntax">QP</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</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><a href="3-wrd.html#SP8" class="function-link"><span class="function-syntax">Wordings::first_wn</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">) >= </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="identifier-syntax">r</span><span class="plain-syntax"> = (*(</span><span class="identifier-syntax">nt</span><span class="plain-syntax">-></span><span class="element-syntax">internal_definition</span><span class="plain-syntax">))(</span><span class="identifier-syntax">W</span><span class="plain-syntax">, &</span><span class="identifier-syntax">Q</span><span class="plain-syntax">, &</span><span class="identifier-syntax">QP</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">else</span><span class="plain-syntax"> { </span><span class="identifier-syntax">r</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">; </span><span class="identifier-syntax">Q</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</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">r</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">nt</span><span class="plain-syntax">-></span><span class="element-syntax">voracious</span><span class="plain-syntax">) </span><span class="identifier-syntax">success_rval</span><span class="plain-syntax"> = </span><span class="identifier-syntax">r</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">ptraci</span><span class="plain-syntax">) </span><span class="identifier-syntax">LOG</span><span class="plain-syntax">(</span><span class="string-syntax">"Succeeded %d\n"</span><span class="plain-syntax">, </span><span class="identifier-syntax">time</span><span class="plain-syntax">(0)-</span><span class="identifier-syntax">start_of_nt</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="4-prf.html#SP_1" class="named-paragraph-link"><span class="named-paragraph">The nonterminal has successfully parsed</span><span class="named-paragraph-number">.1</span></a></span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> } </span><span class="reserved-syntax">else</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">ptraci</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">"%V: <%W> violates "</span><span class="plain-syntax">, </span><span class="identifier-syntax">nt</span><span class="plain-syntax">-></span><span class="element-syntax">nonterminal_id</span><span class="plain-syntax">, </span><span class="identifier-syntax">W</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="4-to.html#SP16" class="function-link"><span class="function-syntax">Optimiser::log_range_requirement</span></a><span class="plain-syntax">(&(</span><span class="identifier-syntax">nt</span><span class="plain-syntax">-></span><span class="element-syntax">nonterminal_req</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">"\n"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> } </span><span class="reserved-syntax">else</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">unoptimised</span><span class="plain-syntax">) || (</span><a href="4-to.html#SP5" class="function-link"><span class="function-syntax">Optimiser::nt_bitmap_violates</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">, &(</span><span class="identifier-syntax">nt</span><span class="plain-syntax">-></span><span class="element-syntax">nonterminal_req</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">void</span><span class="plain-syntax"> *</span><span class="identifier-syntax">acc_result</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">production_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">pl</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="identifier-syntax">pl</span><span class="plain-syntax"> = </span><span class="identifier-syntax">nt</span><span class="plain-syntax">-></span><span class="element-syntax">first_production_list</span><span class="plain-syntax">; </span><span class="identifier-syntax">pl</span><span class="plain-syntax">; </span><span class="identifier-syntax">pl</span><span class="plain-syntax"> = </span><span class="identifier-syntax">pl</span><span class="plain-syntax">-></span><span class="element-syntax">next_production_list</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="constant-syntax">NATURAL_LANGUAGE_WORDS_TYPE</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nl</span><span class="plain-syntax"> = </span><span class="identifier-syntax">pl</span><span class="plain-syntax">-></span><span class="element-syntax">definition_language</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">primary_Preform_language</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) || (</span><span class="identifier-syntax">primary_Preform_language</span><span class="plain-syntax"> == </span><span class="identifier-syntax">nl</span><span class="plain-syntax">)) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">production</span><span class="plain-syntax"> *</span><span class="identifier-syntax">pr</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">last_v</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">for</span><span class="plain-syntax"> (</span><span class="identifier-syntax">pr</span><span class="plain-syntax"> = </span><span class="identifier-syntax">pl</span><span class="plain-syntax">-></span><span class="element-syntax">first_production</span><span class="plain-syntax">; </span><span class="identifier-syntax">pr</span><span class="plain-syntax">; </span><span class="identifier-syntax">pr</span><span class="plain-syntax"> = </span><span class="identifier-syntax">pr</span><span class="plain-syntax">-></span><span class="element-syntax">next_production</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">violates</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">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">unoptimised</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">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">pr</span><span class="plain-syntax">-></span><span class="element-syntax">production_req</span><span class="plain-syntax">.</span><span class="element-syntax">ditto_flag</span><span class="plain-syntax">) </span><span class="identifier-syntax">violates</span><span class="plain-syntax"> = </span><span class="identifier-syntax">last_v</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">violates</span><span class="plain-syntax"> = </span><a href="4-to.html#SP5" class="function-link"><span class="function-syntax">Optimiser::nt_bitmap_violates</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">, &(</span><span class="identifier-syntax">pr</span><span class="plain-syntax">-></span><span class="element-syntax">production_req</span><span class="plain-syntax">));</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">last_v</span><span class="plain-syntax"> = </span><span class="identifier-syntax">violates</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">violates</span><span class="plain-syntax"> == </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="4-prf.html#SP1_2_1" class="named-paragraph-link"><span class="named-paragraph">Parse the given production</span><span class="named-paragraph-number">1.2.1</span></a></span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> } </span><span class="reserved-syntax">else</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">ptraci</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">"production in %V: "</span><span class="plain-syntax">, </span><span class="identifier-syntax">nt</span><span class="plain-syntax">-></span><span class="element-syntax">nonterminal_id</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="4-lp.html#SP18" class="function-link"><span class="function-syntax">LoadPreform::log_production</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">pr</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">LOG</span><span class="plain-syntax">(</span><span class="string-syntax">": <%W> violates "</span><span class="plain-syntax">, </span><span class="identifier-syntax">W</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="4-to.html#SP16" class="function-link"><span class="function-syntax">Optimiser::log_range_requirement</span></a><span class="plain-syntax">(&(</span><span class="identifier-syntax">pr</span><span class="plain-syntax">-></span><span class="element-syntax">production_req</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">"\n"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> }</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">nt</span><span class="plain-syntax">-></span><span class="element-syntax">multiplicitous</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">acc_result</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">Q</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">; </span><span class="reserved-syntax">void</span><span class="plain-syntax"> *</span><span class="identifier-syntax">QP</span><span class="plain-syntax"> = </span><span class="identifier-syntax">acc_result</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="4-prf.html#SP_1" class="named-paragraph-link"><span class="named-paragraph">The nonterminal has successfully parsed</span><span class="named-paragraph-number">.1</span></a></span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> } </span><span class="reserved-syntax">else</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">ptraci</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">"%V: <%W> violates "</span><span class="plain-syntax">, </span><span class="identifier-syntax">nt</span><span class="plain-syntax">-></span><span class="element-syntax">nonterminal_id</span><span class="plain-syntax">, </span><span class="identifier-syntax">W</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="4-to.html#SP16" class="function-link"><span class="function-syntax">Optimiser::log_range_requirement</span></a><span class="plain-syntax">(&(</span><span class="identifier-syntax">nt</span><span class="plain-syntax">-></span><span class="element-syntax">nonterminal_req</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">"\n"</span><span class="plain-syntax">);</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="4-prf.html#SP1">§1</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP1_2_1"></a><b>§1.2.1. </b>So from here on we look only at the external case, where we're parsing the
|
|
text against a production.
|
|
</p>
|
|
|
|
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Parse the given production</span><span class="named-paragraph-number">1.2.1</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">ptraci</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">LOG_INDENT</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="4-prf.html#SP1_2_1_1" class="named-paragraph-link"><span class="named-paragraph">Log the production match number</span><span class="named-paragraph-number">1.2.1.1</span></a></span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><a href="4-lp.html#SP18" class="function-link"><span class="function-syntax">LoadPreform::log_production</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">pr</span><span class="plain-syntax">, </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">); </span><span class="identifier-syntax">LOG</span><span class="plain-syntax">(</span><span class="string-syntax">"\n"</span><span class="plain-syntax">);</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">INSTRUMENTED_PREFORM</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">pr</span><span class="plain-syntax">-></span><span class="element-syntax">production_tries</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">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">slow_scan_needed</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">ifdef</span><span class="plain-syntax"> </span><span class="identifier-syntax">CORE_MODULE</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">added_to_result</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">endif</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">input_length</span><span class="plain-syntax"> >= </span><span class="identifier-syntax">pr</span><span class="plain-syntax">-></span><span class="element-syntax">min_pr_words</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">input_length</span><span class="plain-syntax"> <= </span><span class="identifier-syntax">pr</span><span class="plain-syntax">-></span><span class="identifier-syntax">max_pr_words</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">Q</span><span class="plain-syntax">; </span><span class="reserved-syntax">void</span><span class="plain-syntax"> *</span><span class="identifier-syntax">QP</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="4-prf.html#SP1_2_1_2" class="named-paragraph-link"><span class="named-paragraph">Actually parse the given production, going to Fail if we can't</span><span class="named-paragraph-number">1.2.1.2</span></a></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">INSTRUMENTED_PREFORM</span><span class="plain-syntax"> </span><span class="comment-syntax"> record the sentence containing the longest example</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">pr</span><span class="plain-syntax">-></span><span class="element-syntax">production_matches</span><span class="plain-syntax">++;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="3-wrd.html#SP8" class="function-link"><span class="function-syntax">Wordings::length</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">pr</span><span class="plain-syntax">-></span><span class="identifier-syntax">sample_text</span><span class="plain-syntax">) < </span><a href="3-wrd.html#SP8" class="function-link"><span class="function-syntax">Wordings::length</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">)) </span><span class="identifier-syntax">pr</span><span class="plain-syntax">-></span><span class="element-syntax">sample_text</span><span class="plain-syntax"> = </span><span class="identifier-syntax">W</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">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">ptraci</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="4-prf.html#SP1_2_1_1" class="named-paragraph-link"><span class="named-paragraph">Log the production match number</span><span class="named-paragraph-number">1.2.1.1</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">"succeeded (%s): "</span><span class="plain-syntax">, (</span><span class="identifier-syntax">slow_scan_needed</span><span class="plain-syntax">)?</span><span class="string-syntax">"slowly"</span><span class="plain-syntax">:</span><span class="string-syntax">"quickly"</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">"result: %d\n"</span><span class="plain-syntax">, </span><span class="identifier-syntax">Q</span><span class="plain-syntax">); </span><span class="identifier-syntax">LOG_OUTDENT</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="4-prf.html#SP_1" class="named-paragraph-link"><span class="named-paragraph">The nonterminal has successfully parsed</span><span class="named-paragraph-number">.1</span></a></span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Fail:</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">ptraci</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="4-prf.html#SP1_2_1_1" class="named-paragraph-link"><span class="named-paragraph">Log the production match number</span><span class="named-paragraph-number">1.2.1.1</span></a></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="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">added_to_result</span><span class="plain-syntax">) </span><span class="identifier-syntax">LOG</span><span class="plain-syntax">(</span><span class="string-syntax">"added to result (%s): $P\n"</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> (</span><span class="identifier-syntax">slow_scan_needed</span><span class="plain-syntax">)?</span><span class="string-syntax">"slowly"</span><span class="plain-syntax">:</span><span class="string-syntax">"quickly"</span><span class="plain-syntax">, </span><span class="identifier-syntax">added_to_result</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">endif</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">LOG</span><span class="plain-syntax">(</span><span class="string-syntax">"failed (%s)\n"</span><span class="plain-syntax">, (</span><span class="identifier-syntax">slow_scan_needed</span><span class="plain-syntax">)?</span><span class="string-syntax">"slowly"</span><span class="plain-syntax">:</span><span class="string-syntax">"quickly"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">LOG_OUTDENT</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="4-prf.html#SP1_2">§1.2</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP1_2_1_1"></a><b>§1.2.1.1. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Log the production match number</span><span class="named-paragraph-number">1.2.1.1</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">pr</span><span class="plain-syntax">-></span><span class="element-syntax">match_number</span><span class="plain-syntax"> >= </span><span class="constant-syntax">26</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">"production /%c%c/: "</span><span class="plain-syntax">, </span><span class="character-syntax">'a'</span><span class="plain-syntax">+</span><span class="identifier-syntax">pr</span><span class="plain-syntax">-></span><span class="element-syntax">match_number</span><span class="plain-syntax">-26, </span><span class="character-syntax">'a'</span><span class="plain-syntax">+</span><span class="identifier-syntax">pr</span><span class="plain-syntax">-></span><span class="element-syntax">match_number</span><span class="plain-syntax">-26);</span>
|
|
<span class="plain-syntax"> } </span><span class="reserved-syntax">else</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">"production /%c/: "</span><span class="plain-syntax">, </span><span class="character-syntax">'a'</span><span class="plain-syntax">+</span><span class="identifier-syntax">pr</span><span class="plain-syntax">-></span><span class="element-syntax">match_number</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> }</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="4-prf.html#SP1_2_1">§1.2.1</a> (three times).</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP1_2_1_2"></a><b>§1.2.1.2. </b>Okay. So, the strategy is: a fast scan checking the easy things; if that's
|
|
not sufficient, a slow scan checking the rest; then making sure brackets
|
|
match, if there were any, and last composing the intermediate results into
|
|
the final ones. For example, if the production is
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">adjust</span><span class="plain-syntax"> </span><span class="identifier-syntax">the</span><span class="plain-syntax"> </span><span class="function-syntax"><achingly-slow></span><span class="plain-syntax"> </span><span class="identifier-syntax">to</span><span class="plain-syntax"> </span><span class="identifier-syntax">the</span><span class="plain-syntax"> </span><span class="function-syntax"><exhaustive></span><span class="plain-syntax"> </span><span class="identifier-syntax">at</span><span class="plain-syntax"> </span><span class="identifier-syntax">once</span>
|
|
</pre>
|
|
<p class="commentary">then the fast scan verifies the presence of "adjust the" and "at once";
|
|
the slow scan next looks for all occurrences of "to the", the single strut
|
|
for this production; and only then does it test the two slow nonterminals
|
|
on the intervening words, if there are any.
|
|
</p>
|
|
|
|
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Actually parse the given production, going to Fail if we can't</span><span class="named-paragraph-number">1.2.1.2</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">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">checked</span><span class="plain-syntax">[</span><span class="constant-syntax">MAX_PTOKENS_PER_PRODUCTION</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">intermediates</span><span class="plain-syntax">[</span><span class="constant-syntax">MAX_RESULTS_PER_PRODUCTION</span><span class="plain-syntax">];</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">void</span><span class="plain-syntax"> *</span><span class="identifier-syntax">intermediate_ps</span><span class="plain-syntax">[</span><span class="constant-syntax">MAX_RESULTS_PER_PRODUCTION</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">parsed_open_pos</span><span class="plain-syntax"> = -1, </span><span class="identifier-syntax">parsed_close_pos</span><span class="plain-syntax"> = -1;</span>
|
|
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="4-prf.html#SP1_2_1_2_2" class="named-paragraph-link"><span class="named-paragraph">Try a fast scan through the production</span><span class="named-paragraph-number">1.2.1.2.2</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">slow_scan_needed</span><span class="plain-syntax">) </span><span class="named-paragraph-container code-font"><a href="4-prf.html#SP1_2_1_2_3" class="named-paragraph-link"><span class="named-paragraph">Try a slow scan through the production</span><span class="named-paragraph-number">1.2.1.2.3</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">parsed_open_pos</span><span class="plain-syntax"> >= </span><span class="constant-syntax">0</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">parsed_close_pos</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">if</span><span class="plain-syntax"> (</span><a href="3-wrd.html#SP18" class="function-link"><span class="function-syntax">Wordings::paired_brackets</span></a><span class="plain-syntax">(</span><a href="3-wrd.html#SP6" class="function-link"><span class="function-syntax">Wordings::new</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">parsed_open_pos</span><span class="plain-syntax">, </span><span class="identifier-syntax">parsed_close_pos</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">goto</span><span class="plain-syntax"> </span><span class="identifier-syntax">Fail</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="4-prf.html#SP1_2_1_2_1" class="named-paragraph-link"><span class="named-paragraph">Compose and store the result</span><span class="named-paragraph-number">1.2.1.2.1</span></a></span><span class="plain-syntax">;</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="4-prf.html#SP1_2_1">§1.2.1</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP1_2_1_2_1"></a><b>§1.2.1.2.1. </b>Once we have successfully matched the line, we need to compose the
|
|
intermediate results into a final result. If <span class="extract"><span class="extract-syntax">inweb</span></span> has compiled a compositor
|
|
routine for the nonterminal, we call it: note that it can then return <span class="extract"><span class="extract-syntax">FALSE</span></span>
|
|
to fail the production after all, and can even return <span class="extract"><span class="extract-syntax">FAIL_NONTERMINAL</span></span> to
|
|
abandon not just this production, but all of the productions. (This is quite
|
|
useful as a way to put exceptional syntaxes into the grammar, since it can
|
|
make subsequent productions only available in some cases.)
|
|
</p>
|
|
|
|
<p class="commentary">If there's no compositor then the integer result is the production's number,
|
|
and the pointer result is null.
|
|
</p>
|
|
|
|
<pre class="definitions code-font"><span class="definition-keyword">define</span> <span class="constant-syntax">FAIL_NONTERMINAL</span><span class="plain-syntax"> -100000</span>
|
|
<span class="definition-keyword">define</span> <span class="constant-syntax">FAIL_NONTERMINAL_TO</span><span class="plain-syntax"> </span><span class="constant-syntax">FAIL_NONTERMINAL</span><span class="plain-syntax">+1000</span>
|
|
</pre>
|
|
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Compose and store the result</span><span class="named-paragraph-number">1.2.1.2.1</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">nt</span><span class="plain-syntax">-></span><span class="element-syntax">result_compositor</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">intermediates</span><span class="plain-syntax">[0] = </span><span class="identifier-syntax">pr</span><span class="plain-syntax">-></span><span class="element-syntax">match_number</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">f</span><span class="plain-syntax"> = (*(</span><span class="identifier-syntax">nt</span><span class="plain-syntax">-></span><span class="element-syntax">result_compositor</span><span class="plain-syntax">))(&</span><span class="identifier-syntax">Q</span><span class="plain-syntax">, &</span><span class="identifier-syntax">QP</span><span class="plain-syntax">, </span><span class="identifier-syntax">intermediates</span><span class="plain-syntax">, </span><span class="identifier-syntax">intermediate_ps</span><span class="plain-syntax">, </span><span class="identifier-syntax">nt</span><span class="plain-syntax">-></span><span class="element-syntax">range_result</span><span class="plain-syntax">, </span><span class="identifier-syntax">W</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">f</span><span class="plain-syntax"> == </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">) </span><span class="reserved-syntax">goto</span><span class="plain-syntax"> </span><span class="identifier-syntax">Fail</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">nt</span><span class="plain-syntax">-></span><span class="element-syntax">multiplicitous</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">added_to_result</span><span class="plain-syntax"> = </span><span class="identifier-syntax">QP</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">acc_result</span><span class="plain-syntax"> = (</span><span class="reserved-syntax">void</span><span class="plain-syntax"> *) </span><span class="identifier-syntax">SyntaxTree::add_reading</span><span class="plain-syntax">((</span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *) </span><span class="identifier-syntax">acc_result</span><span class="plain-syntax">, </span><span class="identifier-syntax">QP</span><span class="plain-syntax">, </span><span class="identifier-syntax">W</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">goto</span><span class="plain-syntax"> </span><span class="identifier-syntax">Fail</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">f</span><span class="plain-syntax"> >= </span><span class="constant-syntax">FAIL_NONTERMINAL</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">f</span><span class="plain-syntax"> < </span><span class="constant-syntax">FAIL_NONTERMINAL_TO</span><span class="plain-syntax">)) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">fail_nonterminal_quantum</span><span class="plain-syntax"> = </span><span class="identifier-syntax">f</span><span class="plain-syntax"> - </span><span class="constant-syntax">FAIL_NONTERMINAL</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="4-prf.html#SP1_1" class="named-paragraph-link"><span class="named-paragraph">The nonterminal has failed to parse</span><span class="named-paragraph-number">1.1</span></a></span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Q</span><span class="plain-syntax"> = </span><span class="identifier-syntax">pr</span><span class="plain-syntax">-></span><span class="element-syntax">match_number</span><span class="plain-syntax">; </span><span class="identifier-syntax">QP</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="4-prf.html#SP1_2_1_2">§1.2.1.2</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP1_2_1_2_2"></a><b>§1.2.1.2.2. </b>In the fast scan, we check that all fixed words with known positions
|
|
are in those positions.
|
|
</p>
|
|
|
|
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Try a fast scan through the production</span><span class="named-paragraph-number">1.2.1.2.2</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">ptoken</span><span class="plain-syntax"> *</span><span class="identifier-syntax">pt</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">wn</span><span class="plain-syntax"> = -1, </span><span class="identifier-syntax">tc</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="identifier-syntax">pt</span><span class="plain-syntax"> = </span><span class="identifier-syntax">pr</span><span class="plain-syntax">-></span><span class="element-syntax">first_ptoken</span><span class="plain-syntax">, </span><span class="identifier-syntax">tc</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">; </span><span class="identifier-syntax">pt</span><span class="plain-syntax">; </span><span class="identifier-syntax">pt</span><span class="plain-syntax"> = </span><span class="identifier-syntax">pt</span><span class="plain-syntax">-></span><span class="element-syntax">next_ptoken</span><span class="plain-syntax">, </span><span class="identifier-syntax">tc</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">pt</span><span class="plain-syntax">-></span><span class="element-syntax">ptoken_is_fast</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">p</span><span class="plain-syntax"> = </span><span class="identifier-syntax">pt</span><span class="plain-syntax">-></span><span class="element-syntax">ptoken_position</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">p</span><span class="plain-syntax"> > </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="identifier-syntax">wn</span><span class="plain-syntax"> = </span><a href="3-wrd.html#SP8" class="function-link"><span class="function-syntax">Wordings::first_wn</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">)+</span><span class="identifier-syntax">p</span><span class="plain-syntax">-1;</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">p</span><span class="plain-syntax"> < </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="identifier-syntax">wn</span><span class="plain-syntax"> = </span><a href="3-wrd.html#SP8" class="function-link"><span class="function-syntax">Wordings::last_wn</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">)+</span><span class="identifier-syntax">p</span><span class="plain-syntax">+1;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="4-prf.html#SP3" class="function-link"><span class="function-syntax">Preform::parse_fixed_word_ptoken</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">wn</span><span class="plain-syntax">, </span><span class="identifier-syntax">pt</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">slow_scan_needed</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">goto</span><span class="plain-syntax"> </span><span class="identifier-syntax">Fail</span><span class="plain-syntax">; </span><span class="comment-syntax"> the word should have been here, and it wasn't</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">pt</span><span class="plain-syntax">-></span><span class="element-syntax">ve_pt</span><span class="plain-syntax"> == </span><span class="identifier-syntax">OPENBRACKET_V</span><span class="plain-syntax">) </span><span class="identifier-syntax">parsed_open_pos</span><span class="plain-syntax"> = </span><span class="identifier-syntax">wn</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">pt</span><span class="plain-syntax">-></span><span class="element-syntax">ve_pt</span><span class="plain-syntax"> == </span><span class="identifier-syntax">CLOSEBRACKET_V</span><span class="plain-syntax">) </span><span class="identifier-syntax">parsed_close_pos</span><span class="plain-syntax"> = </span><span class="identifier-syntax">wn</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">checked</span><span class="plain-syntax">[</span><span class="identifier-syntax">tc</span><span class="plain-syntax">] = </span><span class="identifier-syntax">wn</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">slow_scan_needed</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">checked</span><span class="plain-syntax">[</span><span class="identifier-syntax">tc</span><span class="plain-syntax">] = -1;</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">slow_scan_needed</span><span class="plain-syntax"> == </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">wn</span><span class="plain-syntax"> != </span><a href="3-wrd.html#SP8" class="function-link"><span class="function-syntax">Wordings::last_wn</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">))) </span><span class="reserved-syntax">goto</span><span class="plain-syntax"> </span><span class="identifier-syntax">Fail</span><span class="plain-syntax">; </span><span class="comment-syntax"> input text goes on further</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="4-prf.html#SP1_2_1_2">§1.2.1.2</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP1_2_1_2_3"></a><b>§1.2.1.2.3. </b>The slow scan is more challenging. We want to loop through all possible
|
|
strut positions, where by "possible" we mean that
|
|
$$ s_i+\ell_i <= s_{i+1}, \quad i = 0, 1, ..., s $$
|
|
and that for each \(i\) the \(i\)-th strut matches the text beginning at \(s_i\).
|
|
</p>
|
|
|
|
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Try a slow scan through the production</span><span class="named-paragraph-number">1.2.1.2.3</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">spos</span><span class="plain-syntax">[</span><span class="constant-syntax">MAX_STRUTS_PER_PRODUCTION</span><span class="plain-syntax">]; </span><span class="comment-syntax"> word numbers for where we are trying the struts</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">NS</span><span class="plain-syntax"> = </span><span class="identifier-syntax">pr</span><span class="plain-syntax">-></span><span class="element-syntax">no_struts</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="4-prf.html#SP1_2_1_2_3_1" class="named-paragraph-link"><span class="named-paragraph">Start from the lexicographically earliest strut position</span><span class="named-paragraph-number">1.2.1.2.3.1</span></a></span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">ptoken</span><span class="plain-syntax"> *</span><span class="identifier-syntax">backtrack_token</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">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">backtrack_index</span><span class="plain-syntax"> = -1, </span><span class="identifier-syntax">backtrack_to</span><span class="plain-syntax"> = -1, </span><span class="identifier-syntax">backtrack_tc</span><span class="plain-syntax"> = -1;</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="4-prf.html#SP1_2_1_2_3_3" class="named-paragraph-link"><span class="named-paragraph">Try a slow scan with the current strut positions</span><span class="named-paragraph-number">1.2.1.2.3.3</span></a></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="identifier-syntax">FailThisStrutPosition:</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">backtrack_token</span><span class="plain-syntax">) </span><span class="reserved-syntax">continue</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="4-prf.html#SP1_2_1_2_3_2" class="named-paragraph-link"><span class="named-paragraph">Move on to the next strut position</span><span class="named-paragraph-number">1.2.1.2.3.2</span></a></span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="4-prf.html#SP1_2_1_2">§1.2.1.2</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP1_2_1_2_3_1"></a><b>§1.2.1.2.3.1. </b>We start by finding the lexicographically earliest, i.e., we find the earliest
|
|
possible position for \(s_0\), then the earliest position from \(s_0+\ell_0\) for
|
|
\(s_1\), and so on. (Our wildcards are not greedy: we match with shortest possible
|
|
text rather than longest.)
|
|
</p>
|
|
|
|
<p class="commentary">In all of the code below, the general case with <span class="extract"><span class="extract-syntax">NS</span></span> greater than 1 is actually
|
|
valid code for all cases, but experiment shows about a 5\% speed gain from
|
|
handling the popular case of one strut separately.
|
|
</p>
|
|
|
|
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Start from the lexicographically earliest strut position</span><span class="named-paragraph-number">1.2.1.2.3.1</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">NS</span><span class="plain-syntax"> == </span><span class="constant-syntax">1</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">spos</span><span class="plain-syntax">[0] = </span><a href="4-prf.html#SP2" class="function-link"><span class="function-syntax">Preform::next_strut_posn_after</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">, </span><span class="identifier-syntax">pr</span><span class="plain-syntax">-></span><span class="element-syntax">struts</span><span class="plain-syntax">[0], </span><span class="identifier-syntax">pr</span><span class="plain-syntax">-></span><span class="element-syntax">strut_lengths</span><span class="plain-syntax">[0], </span><a href="3-wrd.html#SP8" class="function-link"><span class="function-syntax">Wordings::first_wn</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">W</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">spos</span><span class="plain-syntax">[0] == -1) </span><span class="reserved-syntax">goto</span><span class="plain-syntax"> </span><span class="identifier-syntax">Fail</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">NS</span><span class="plain-syntax"> > </span><span class="constant-syntax">1</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">s</span><span class="plain-syntax">, </span><span class="identifier-syntax">from</span><span class="plain-syntax"> = </span><a href="3-wrd.html#SP8" class="function-link"><span class="function-syntax">Wordings::first_wn</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="identifier-syntax">s</span><span class="plain-syntax">=0; </span><span class="identifier-syntax">s</span><span class="plain-syntax"><</span><span class="identifier-syntax">NS</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">spos</span><span class="plain-syntax">[</span><span class="identifier-syntax">s</span><span class="plain-syntax">] = </span><a href="4-prf.html#SP2" class="function-link"><span class="function-syntax">Preform::next_strut_posn_after</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">, </span><span class="identifier-syntax">pr</span><span class="plain-syntax">-></span><span class="element-syntax">struts</span><span class="plain-syntax">[</span><span class="identifier-syntax">s</span><span class="plain-syntax">], </span><span class="identifier-syntax">pr</span><span class="plain-syntax">-></span><span class="element-syntax">strut_lengths</span><span class="plain-syntax">[</span><span class="identifier-syntax">s</span><span class="plain-syntax">], </span><span class="identifier-syntax">from</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">spos</span><span class="plain-syntax">[</span><span class="identifier-syntax">s</span><span class="plain-syntax">] == -1) </span><span class="reserved-syntax">goto</span><span class="plain-syntax"> </span><span class="identifier-syntax">Fail</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">from</span><span class="plain-syntax"> = </span><span class="identifier-syntax">spos</span><span class="plain-syntax">[</span><span class="identifier-syntax">s</span><span class="plain-syntax">] + </span><span class="identifier-syntax">pr</span><span class="plain-syntax">-></span><span class="identifier-syntax">strut_lengths</span><span class="plain-syntax">[</span><span class="identifier-syntax">s</span><span class="plain-syntax">] + </span><span class="constant-syntax">1</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="4-prf.html#SP1_2_1_2_3">§1.2.1.2.3</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP1_2_1_2_3_2"></a><b>§1.2.1.2.3.2. </b>In the general case, we move the final strut forward if we can; if we can't,
|
|
we move the penultimate one, then move the final one to the first subsequent
|
|
position valid for it; and so on. Ultimately this results in the first strut
|
|
being unable to move forwards, at which point, we've lost.
|
|
</p>
|
|
|
|
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Move on to the next strut position</span><span class="named-paragraph-number">1.2.1.2.3.2</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">NS</span><span class="plain-syntax"> == </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="reserved-syntax">goto</span><span class="plain-syntax"> </span><span class="identifier-syntax">Fail</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">NS</span><span class="plain-syntax"> == </span><span class="constant-syntax">1</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">spos</span><span class="plain-syntax">[0] = </span><a href="4-prf.html#SP2" class="function-link"><span class="function-syntax">Preform::next_strut_posn_after</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">, </span><span class="identifier-syntax">pr</span><span class="plain-syntax">-></span><span class="element-syntax">struts</span><span class="plain-syntax">[0], </span><span class="identifier-syntax">pr</span><span class="plain-syntax">-></span><span class="element-syntax">strut_lengths</span><span class="plain-syntax">[0], </span><span class="identifier-syntax">spos</span><span class="plain-syntax">[0]+1);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">spos</span><span class="plain-syntax">[0] == -1) </span><span class="reserved-syntax">goto</span><span class="plain-syntax"> </span><span class="identifier-syntax">Fail</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">NS</span><span class="plain-syntax"> > </span><span class="constant-syntax">1</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">s</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="identifier-syntax">s</span><span class="plain-syntax">=</span><span class="identifier-syntax">NS</span><span class="plain-syntax">-1; </span><span class="identifier-syntax">s</span><span class="plain-syntax">>=0; </span><span class="identifier-syntax">s</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">n</span><span class="plain-syntax"> = </span><a href="4-prf.html#SP2" class="function-link"><span class="function-syntax">Preform::next_strut_posn_after</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">, </span><span class="identifier-syntax">pr</span><span class="plain-syntax">-></span><span class="element-syntax">struts</span><span class="plain-syntax">[</span><span class="identifier-syntax">s</span><span class="plain-syntax">], </span><span class="identifier-syntax">pr</span><span class="plain-syntax">-></span><span class="element-syntax">strut_lengths</span><span class="plain-syntax">[</span><span class="identifier-syntax">s</span><span class="plain-syntax">], </span><span class="identifier-syntax">spos</span><span class="plain-syntax">[</span><span class="identifier-syntax">s</span><span class="plain-syntax">]+1);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">n</span><span class="plain-syntax"> != -1) { </span><span class="identifier-syntax">spos</span><span class="plain-syntax">[</span><span class="identifier-syntax">s</span><span class="plain-syntax">] = </span><span class="identifier-syntax">n</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><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">s</span><span class="plain-syntax"> == -1) </span><span class="reserved-syntax">goto</span><span class="plain-syntax"> </span><span class="identifier-syntax">Fail</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">from</span><span class="plain-syntax"> = </span><span class="identifier-syntax">spos</span><span class="plain-syntax">[</span><span class="identifier-syntax">s</span><span class="plain-syntax">] + </span><span class="constant-syntax">1</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">for</span><span class="plain-syntax"> (; </span><span class="identifier-syntax">s</span><span class="plain-syntax"><</span><span class="identifier-syntax">NS</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">spos</span><span class="plain-syntax">[</span><span class="identifier-syntax">s</span><span class="plain-syntax">] = </span><a href="4-prf.html#SP2" class="function-link"><span class="function-syntax">Preform::next_strut_posn_after</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">, </span><span class="identifier-syntax">pr</span><span class="plain-syntax">-></span><span class="element-syntax">struts</span><span class="plain-syntax">[</span><span class="identifier-syntax">s</span><span class="plain-syntax">], </span><span class="identifier-syntax">pr</span><span class="plain-syntax">-></span><span class="element-syntax">strut_lengths</span><span class="plain-syntax">[</span><span class="identifier-syntax">s</span><span class="plain-syntax">], </span><span class="identifier-syntax">from</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">spos</span><span class="plain-syntax">[</span><span class="identifier-syntax">s</span><span class="plain-syntax">] == -1) </span><span class="reserved-syntax">goto</span><span class="plain-syntax"> </span><span class="identifier-syntax">Fail</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">from</span><span class="plain-syntax"> = </span><span class="identifier-syntax">spos</span><span class="plain-syntax">[</span><span class="identifier-syntax">s</span><span class="plain-syntax">] + </span><span class="identifier-syntax">pr</span><span class="plain-syntax">-></span><span class="identifier-syntax">strut_lengths</span><span class="plain-syntax">[</span><span class="identifier-syntax">s</span><span class="plain-syntax">] + </span><span class="constant-syntax">1</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="4-prf.html#SP1_2_1_2_3">§1.2.1.2.3</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP1_2_1_2_3_3"></a><b>§1.2.1.2.3.3. </b>We can now forget about struts, thankfully, and check the remaining unchecked
|
|
ptokens.
|
|
</p>
|
|
|
|
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Try a slow scan with the current strut positions</span><span class="named-paragraph-number">1.2.1.2.3.3</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">wn</span><span class="plain-syntax"> = </span><a href="3-wrd.html#SP8" class="function-link"><span class="function-syntax">Wordings::first_wn</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">), </span><span class="identifier-syntax">tc</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">ptoken</span><span class="plain-syntax"> *</span><span class="identifier-syntax">pt</span><span class="plain-syntax">, *</span><span class="identifier-syntax">nextpt</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">backtrack_token</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">pt</span><span class="plain-syntax"> = </span><span class="identifier-syntax">backtrack_token</span><span class="plain-syntax">; </span><span class="identifier-syntax">nextpt</span><span class="plain-syntax"> = </span><span class="identifier-syntax">backtrack_token</span><span class="plain-syntax">-></span><span class="element-syntax">next_ptoken</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">tc</span><span class="plain-syntax"> = </span><span class="identifier-syntax">backtrack_tc</span><span class="plain-syntax">; </span><span class="identifier-syntax">wn</span><span class="plain-syntax"> = </span><span class="identifier-syntax">backtrack_to</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">goto</span><span class="plain-syntax"> </span><span class="identifier-syntax">Reenter</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="identifier-syntax">pt</span><span class="plain-syntax"> = </span><span class="identifier-syntax">pr</span><span class="plain-syntax">-></span><span class="element-syntax">first_ptoken</span><span class="plain-syntax">, </span><span class="identifier-syntax">nextpt</span><span class="plain-syntax"> = (</span><span class="identifier-syntax">pt</span><span class="plain-syntax">)?(</span><span class="identifier-syntax">pt</span><span class="plain-syntax">-></span><span class="element-syntax">next_ptoken</span><span class="plain-syntax">):</span><span class="identifier-syntax">NULL</span><span class="plain-syntax">, </span><span class="identifier-syntax">tc</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">pt</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">pt</span><span class="plain-syntax"> = </span><span class="identifier-syntax">nextpt</span><span class="plain-syntax">, </span><span class="identifier-syntax">nextpt</span><span class="plain-syntax"> = (</span><span class="identifier-syntax">pt</span><span class="plain-syntax">)?(</span><span class="identifier-syntax">pt</span><span class="plain-syntax">-></span><span class="element-syntax">next_ptoken</span><span class="plain-syntax">):</span><span class="identifier-syntax">NULL</span><span class="plain-syntax">, </span><span class="identifier-syntax">tc</span><span class="plain-syntax">++) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Reenter:</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">known_pos</span><span class="plain-syntax"> = </span><span class="identifier-syntax">checked</span><span class="plain-syntax">[</span><span class="identifier-syntax">tc</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">known_pos</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">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">wn</span><span class="plain-syntax"> > </span><span class="identifier-syntax">known_pos</span><span class="plain-syntax">) </span><span class="reserved-syntax">goto</span><span class="plain-syntax"> </span><span class="identifier-syntax">Fail</span><span class="plain-syntax">; </span><span class="comment-syntax"> a theoretical possibility if strut lookahead overreaches</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">wn</span><span class="plain-syntax"> = </span><span class="identifier-syntax">known_pos</span><span class="plain-syntax">+1;</span>
|
|
<span class="plain-syntax"> } </span><span class="reserved-syntax">else</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">pt</span><span class="plain-syntax">-></span><span class="element-syntax">range_starts</span><span class="plain-syntax"> >= </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="identifier-syntax">nt</span><span class="plain-syntax">-></span><span class="element-syntax">range_result</span><span class="plain-syntax">[</span><span class="identifier-syntax">pt</span><span class="plain-syntax">-></span><span class="element-syntax">range_starts</span><span class="plain-syntax">] = </span><a href="3-wrd.html#SP6" class="function-link"><span class="function-syntax">Wordings::one_word</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">wn</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">switch</span><span class="plain-syntax"> (</span><span class="identifier-syntax">pt</span><span class="plain-syntax">-></span><span class="element-syntax">ptoken_category</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">FIXED_WORD_PTC:</span><span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="4-prf.html#SP1_2_1_2_3_3_1" class="named-paragraph-link"><span class="named-paragraph">Match a fixed word ptoken</span><span class="named-paragraph-number">1.2.1.2.3.3.1</span></a></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">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">SINGLE_WILDCARD_PTC:</span><span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="4-prf.html#SP1_2_1_2_3_3_2" class="named-paragraph-link"><span class="named-paragraph">Match a single wildcard ptoken</span><span class="named-paragraph-number">1.2.1.2.3.3.2</span></a></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">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">MULTIPLE_WILDCARD_PTC:</span><span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="4-prf.html#SP1_2_1_2_3_3_3" class="named-paragraph-link"><span class="named-paragraph">Match a multiple wildcard ptoken</span><span class="named-paragraph-number">1.2.1.2.3.3.3</span></a></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">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">POSSIBLY_EMPTY_WILDCARD_PTC:</span><span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="4-prf.html#SP1_2_1_2_3_3_4" class="named-paragraph-link"><span class="named-paragraph">Match a possibly empty wildcard ptoken</span><span class="named-paragraph-number">1.2.1.2.3.3.4</span></a></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">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">NONTERMINAL_PTC:</span><span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="4-prf.html#SP1_2_1_2_3_3_5" class="named-paragraph-link"><span class="named-paragraph">Match a nonterminal ptoken</span><span class="named-paragraph-number">1.2.1.2.3.3.5</span></a></span><span class="plain-syntax">; </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
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|
<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">pt</span><span class="plain-syntax">-></span><span class="element-syntax">range_ends</span><span class="plain-syntax"> >= </span><span class="constant-syntax">0</span><span class="plain-syntax">)</span>
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|
<span class="plain-syntax"> </span><span class="identifier-syntax">nt</span><span class="plain-syntax">-></span><span class="element-syntax">range_result</span><span class="plain-syntax">[</span><span class="identifier-syntax">pt</span><span class="plain-syntax">-></span><span class="element-syntax">range_ends</span><span class="plain-syntax">] = </span><a href="3-wrd.html#SP7" class="function-link"><span class="function-syntax">Wordings::up_to</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">nt</span><span class="plain-syntax">-></span><span class="element-syntax">range_result</span><span class="plain-syntax">[</span><span class="identifier-syntax">pt</span><span class="plain-syntax">-></span><span class="element-syntax">range_ends</span><span class="plain-syntax">], </span><span class="identifier-syntax">wn</span><span class="plain-syntax">-1);</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">wn</span><span class="plain-syntax"> != </span><a href="3-wrd.html#SP8" class="function-link"><span class="function-syntax">Wordings::last_wn</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">)+1) </span><span class="reserved-syntax">goto</span><span class="plain-syntax"> </span><span class="identifier-syntax">FailThisStrutPosition</span><span class="plain-syntax">;</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="4-prf.html#SP1_2_1_2_3">§1.2.1.2.3</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP1_2_1_2_3_3_1"></a><b>§1.2.1.2.3.3.1. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Match a fixed word ptoken</span><span class="named-paragraph-number">1.2.1.2.3.3.1</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">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">q</span><span class="plain-syntax"> = </span><a href="4-prf.html#SP3" class="function-link"><span class="function-syntax">Preform::parse_fixed_word_ptoken</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">wn</span><span class="plain-syntax">, </span><span class="identifier-syntax">pt</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">q</span><span class="plain-syntax"> == </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">) </span><span class="reserved-syntax">goto</span><span class="plain-syntax"> </span><span class="identifier-syntax">FailThisStrutPosition</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">pt</span><span class="plain-syntax">-></span><span class="element-syntax">ve_pt</span><span class="plain-syntax"> == </span><span class="identifier-syntax">OPENBRACKET_V</span><span class="plain-syntax">) </span><span class="identifier-syntax">parsed_open_pos</span><span class="plain-syntax"> = </span><span class="identifier-syntax">wn</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">pt</span><span class="plain-syntax">-></span><span class="element-syntax">ve_pt</span><span class="plain-syntax"> == </span><span class="identifier-syntax">CLOSEBRACKET_V</span><span class="plain-syntax">) </span><span class="identifier-syntax">parsed_close_pos</span><span class="plain-syntax"> = </span><span class="identifier-syntax">wn</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">wn</span><span class="plain-syntax">++;</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="4-prf.html#SP1_2_1_2_3_3">§1.2.1.2.3.3</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP1_2_1_2_3_3_2"></a><b>§1.2.1.2.3.3.2. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Match a single wildcard ptoken</span><span class="named-paragraph-number">1.2.1.2.3.3.2</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">wn</span><span class="plain-syntax">++;</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="4-prf.html#SP1_2_1_2_3_3">§1.2.1.2.3.3</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP1_2_1_2_3_3_3"></a><b>§1.2.1.2.3.3.3. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Match a multiple wildcard ptoken</span><span class="named-paragraph-number">1.2.1.2.3.3.3</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">wn</span><span class="plain-syntax"> > </span><a href="3-wrd.html#SP8" class="function-link"><span class="function-syntax">Wordings::last_wn</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">)) </span><span class="reserved-syntax">goto</span><span class="plain-syntax"> </span><span class="identifier-syntax">FailThisStrutPosition</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">wt</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="4-prf.html#SP1_2_1_2_3_3_3_1" class="named-paragraph-link"><span class="named-paragraph">Calculate how much to stretch this elastic ptoken</span><span class="named-paragraph-number">1.2.1.2.3.3.3.1</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">wn</span><span class="plain-syntax"> > </span><span class="identifier-syntax">wt</span><span class="plain-syntax">) </span><span class="reserved-syntax">goto</span><span class="plain-syntax"> </span><span class="identifier-syntax">FailThisStrutPosition</span><span class="plain-syntax">; </span><span class="comment-syntax"> zero length</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">pt</span><span class="plain-syntax">-></span><span class="element-syntax">balanced_wildcard</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">i</span><span class="plain-syntax">, </span><span class="identifier-syntax">bl</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">for</span><span class="plain-syntax"> (</span><span class="identifier-syntax">i</span><span class="plain-syntax">=</span><span class="identifier-syntax">wn</span><span class="plain-syntax">; </span><span class="identifier-syntax">i</span><span class="plain-syntax"><=</span><span class="identifier-syntax">wt</span><span class="plain-syntax">; </span><span class="identifier-syntax">i</span><span class="plain-syntax">++) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><a href="3-lxr.html#SP20" class="function-link"><span class="function-syntax">Lexer::word</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">i</span><span class="plain-syntax">) == </span><span class="identifier-syntax">OPENBRACKET_V</span><span class="plain-syntax">) || (</span><a href="3-lxr.html#SP20" class="function-link"><span class="function-syntax">Lexer::word</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">i</span><span class="plain-syntax">) == </span><span class="identifier-syntax">OPENBRACE_V</span><span class="plain-syntax">)) </span><span class="identifier-syntax">bl</span><span class="plain-syntax">++;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><a href="3-lxr.html#SP20" class="function-link"><span class="function-syntax">Lexer::word</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">i</span><span class="plain-syntax">) == </span><span class="identifier-syntax">CLOSEBRACKET_V</span><span class="plain-syntax">) || (</span><a href="3-lxr.html#SP20" class="function-link"><span class="function-syntax">Lexer::word</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">i</span><span class="plain-syntax">) == </span><span class="identifier-syntax">CLOSEBRACE_V</span><span class="plain-syntax">)) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">bl</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">bl</span><span class="plain-syntax"> < </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="reserved-syntax">goto</span><span class="plain-syntax"> </span><span class="identifier-syntax">FailThisStrutPosition</span><span class="plain-syntax">;</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">bl</span><span class="plain-syntax"> != </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="reserved-syntax">goto</span><span class="plain-syntax"> </span><span class="identifier-syntax">FailThisStrutPosition</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">wn</span><span class="plain-syntax"> = </span><span class="identifier-syntax">wt</span><span class="plain-syntax">+1;</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="4-prf.html#SP1_2_1_2_3_3">§1.2.1.2.3.3</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP1_2_1_2_3_3_4"></a><b>§1.2.1.2.3.3.4. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Match a possibly empty wildcard ptoken</span><span class="named-paragraph-number">1.2.1.2.3.3.4</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">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">wt</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="4-prf.html#SP1_2_1_2_3_3_3_1" class="named-paragraph-link"><span class="named-paragraph">Calculate how much to stretch this elastic ptoken</span><span class="named-paragraph-number">1.2.1.2.3.3.3.1</span></a></span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">wn</span><span class="plain-syntax"> = </span><span class="identifier-syntax">wt</span><span class="plain-syntax">+1;</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="4-prf.html#SP1_2_1_2_3_3">§1.2.1.2.3.3</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP1_2_1_2_3_3_5"></a><b>§1.2.1.2.3.3.5. </b>A voracious nonterminal is offered the entire rest of the word range, and
|
|
returns how much it ate. Otherwise, we offer the maximum amount of space
|
|
available: if, for word-count reasons, that's never going to match, then
|
|
we rely on the recursive call to <span class="extract"><span class="extract-syntax">Preform::parse_nt_against_word_range</span></span> returning a
|
|
quick no.
|
|
</p>
|
|
|
|
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Match a nonterminal ptoken</span><span class="named-paragraph-number">1.2.1.2.3.3.5</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">wn</span><span class="plain-syntax"> > </span><a href="3-wrd.html#SP8" class="function-link"><span class="function-syntax">Wordings::last_wn</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">)) && (</span><span class="identifier-syntax">pt</span><span class="plain-syntax">-></span><span class="element-syntax">nt_pt</span><span class="plain-syntax">-></span><span class="element-syntax">min_nt_words</span><span class="plain-syntax"> > </span><span class="constant-syntax">0</span><span class="plain-syntax">)) </span><span class="reserved-syntax">goto</span><span class="plain-syntax"> </span><span class="identifier-syntax">FailThisStrutPosition</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">wt</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">pt</span><span class="plain-syntax">-></span><span class="element-syntax">nt_pt</span><span class="plain-syntax">-></span><span class="element-syntax">voracious</span><span class="plain-syntax">) </span><span class="identifier-syntax">wt</span><span class="plain-syntax"> = </span><a href="3-wrd.html#SP8" class="function-link"><span class="function-syntax">Wordings::last_wn</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">W</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">pt</span><span class="plain-syntax">-></span><span class="element-syntax">nt_pt</span><span class="plain-syntax">-></span><span class="element-syntax">min_nt_words</span><span class="plain-syntax"> > </span><span class="constant-syntax">0</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">pt</span><span class="plain-syntax">-></span><span class="element-syntax">nt_pt</span><span class="plain-syntax">-></span><span class="element-syntax">min_nt_words</span><span class="plain-syntax"> == </span><span class="identifier-syntax">pt</span><span class="plain-syntax">-></span><span class="element-syntax">nt_pt</span><span class="plain-syntax">-></span><span class="identifier-syntax">max_nt_words</span><span class="plain-syntax">))</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">wt</span><span class="plain-syntax"> = </span><span class="identifier-syntax">wn</span><span class="plain-syntax"> + </span><span class="identifier-syntax">pt</span><span class="plain-syntax">-></span><span class="element-syntax">nt_pt</span><span class="plain-syntax">-></span><span class="element-syntax">min_nt_words</span><span class="plain-syntax"> - </span><span class="constant-syntax">1</span><span class="plain-syntax">;</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="4-prf.html#SP1_2_1_2_3_3_3_1" class="named-paragraph-link"><span class="named-paragraph">Calculate how much to stretch this elastic ptoken</span><span class="named-paragraph-number">1.2.1.2.3.3.3.1</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">pt</span><span class="plain-syntax"> == </span><span class="identifier-syntax">backtrack_token</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">ptraci</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">"Reached backtrack position %V: <%W>\n"</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">pt</span><span class="plain-syntax">-></span><span class="element-syntax">nt_pt</span><span class="plain-syntax">-></span><span class="element-syntax">nonterminal_id</span><span class="plain-syntax">, </span><a href="3-wrd.html#SP6" class="function-link"><span class="function-syntax">Wordings::new</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">wn</span><span class="plain-syntax">, </span><span class="identifier-syntax">wt</span><span class="plain-syntax">));</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">preform_backtrack</span><span class="plain-syntax"> = </span><span class="identifier-syntax">intermediate_ps</span><span class="plain-syntax">[</span><span class="identifier-syntax">pt</span><span class="plain-syntax">-></span><span class="element-syntax">result_index</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">ptraci</span><span class="plain-syntax">) </span><span class="identifier-syntax">LOG_INDENT</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">q</span><span class="plain-syntax"> = </span><a href="4-prf.html#SP1" class="function-link"><span class="function-syntax">Preform::parse_nt_against_word_range</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">pt</span><span class="plain-syntax">-></span><span class="element-syntax">nt_pt</span><span class="plain-syntax">, </span><a href="3-wrd.html#SP6" class="function-link"><span class="function-syntax">Wordings::new</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">wn</span><span class="plain-syntax">, </span><span class="identifier-syntax">wt</span><span class="plain-syntax">),</span>
|
|
<span class="plain-syntax"> &(</span><span class="identifier-syntax">intermediates</span><span class="plain-syntax">[</span><span class="identifier-syntax">pt</span><span class="plain-syntax">-></span><span class="element-syntax">result_index</span><span class="plain-syntax">]), &(</span><span class="identifier-syntax">intermediate_ps</span><span class="plain-syntax">[</span><span class="identifier-syntax">pt</span><span class="plain-syntax">-></span><span class="element-syntax">result_index</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">ptraci</span><span class="plain-syntax">) </span><span class="identifier-syntax">LOG_OUTDENT</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">pt</span><span class="plain-syntax"> == </span><span class="identifier-syntax">backtrack_token</span><span class="plain-syntax">) { </span><span class="identifier-syntax">preform_backtrack</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">; </span><span class="identifier-syntax">backtrack_token</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">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">pt</span><span class="plain-syntax">-></span><span class="element-syntax">nt_pt</span><span class="plain-syntax">-></span><span class="element-syntax">voracious</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">q</span><span class="plain-syntax"> > </span><span class="constant-syntax">0</span><span class="plain-syntax">) { </span><span class="identifier-syntax">wt</span><span class="plain-syntax"> = </span><span class="identifier-syntax">q</span><span class="plain-syntax">; </span><span class="identifier-syntax">q</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">else</span><span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">q</span><span class="plain-syntax"> < </span><span class="constant-syntax">0</span><span class="plain-syntax">) { </span><span class="identifier-syntax">wt</span><span class="plain-syntax"> = -</span><span class="identifier-syntax">q</span><span class="plain-syntax">; </span><span class="identifier-syntax">q</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">backtrack_index</span><span class="plain-syntax"> = </span><span class="identifier-syntax">pt</span><span class="plain-syntax">-></span><span class="element-syntax">result_index</span><span class="plain-syntax">; </span><span class="identifier-syntax">backtrack_to</span><span class="plain-syntax"> = </span><span class="identifier-syntax">wn</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">backtrack_token</span><span class="plain-syntax"> = </span><span class="identifier-syntax">pt</span><span class="plain-syntax">; </span><span class="identifier-syntax">backtrack_tc</span><span class="plain-syntax"> = </span><span class="identifier-syntax">tc</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">ptraci</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">"Set backtrack position %V: <%W>\n"</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">pt</span><span class="plain-syntax">-></span><span class="element-syntax">nt_pt</span><span class="plain-syntax">-></span><span class="element-syntax">nonterminal_id</span><span class="plain-syntax">, </span><a href="3-wrd.html#SP6" class="function-link"><span class="function-syntax">Wordings::new</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">wn</span><span class="plain-syntax">, </span><span class="identifier-syntax">wt</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">wt</span><span class="plain-syntax"> = </span><span class="identifier-syntax">wn</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">pt</span><span class="plain-syntax">-></span><span class="element-syntax">negated_ptoken</span><span class="plain-syntax">) </span><span class="identifier-syntax">q</span><span class="plain-syntax"> = </span><span class="identifier-syntax">q</span><span class="plain-syntax">?</span><span class="identifier-syntax">FALSE:TRUE</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">q</span><span class="plain-syntax"> == </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">) </span><span class="reserved-syntax">goto</span><span class="plain-syntax"> </span><span class="identifier-syntax">FailThisStrutPosition</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">pt</span><span class="plain-syntax">-></span><span class="element-syntax">nt_pt</span><span class="plain-syntax">-></span><span class="identifier-syntax">max_nt_words</span><span class="plain-syntax"> > </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="identifier-syntax">wn</span><span class="plain-syntax"> = </span><span class="identifier-syntax">wt</span><span class="plain-syntax">+1;</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="4-prf.html#SP1_2_1_2_3_3">§1.2.1.2.3.3</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP1_2_1_2_3_3_3_1"></a><b>§1.2.1.2.3.3.3.1. </b>How much text from the input should this ptoken match? We feed it as much
|
|
as possible, and to calculate that, we must either be at the end of the run,
|
|
or else know exactly where the next ptoken starts: because its position is
|
|
known, or because it's a strut.
|
|
</p>
|
|
|
|
<p class="commentary">This is why two elastic nonterminals in a row won't parse correctly:
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">frog</span><span class="plain-syntax"> </span><span class="function-syntax"><amphibian></span><span class="plain-syntax"> </span><span class="function-syntax"><pond-preference></span><span class="plain-syntax"> </span><span class="identifier-syntax">toad</span>
|
|
</pre>
|
|
<p class="commentary">Preform is unable to work out where the central boundary will occur. In theory
|
|
it should try every possibility. But that's inefficient: in practice the
|
|
solution is to write the grammar to minimise these cases, and then to set up
|
|
<amphibian> as a voracious token, so that it decides the boundary position
|
|
for itself. (If <amphibian> is not voracious, the following calculation
|
|
probably gives the wrong answer.)
|
|
</p>
|
|
|
|
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Calculate how much to stretch this elastic ptoken</span><span class="named-paragraph-number">1.2.1.2.3.3.3.1</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">ptoken</span><span class="plain-syntax"> *</span><span class="identifier-syntax">lookahead</span><span class="plain-syntax"> = </span><span class="identifier-syntax">nextpt</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">lookahead</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="identifier-syntax">wt</span><span class="plain-syntax"> = </span><a href="3-wrd.html#SP8" class="function-link"><span class="function-syntax">Wordings::last_wn</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">else</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">p</span><span class="plain-syntax"> = </span><span class="identifier-syntax">lookahead</span><span class="plain-syntax">-></span><span class="element-syntax">ptoken_position</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">p</span><span class="plain-syntax"> > </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="identifier-syntax">wt</span><span class="plain-syntax"> = </span><a href="3-wrd.html#SP8" class="function-link"><span class="function-syntax">Wordings::first_wn</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">)+</span><span class="identifier-syntax">p</span><span class="plain-syntax">-2;</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">p</span><span class="plain-syntax"> < </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="identifier-syntax">wt</span><span class="plain-syntax"> = </span><a href="3-wrd.html#SP8" class="function-link"><span class="function-syntax">Wordings::last_wn</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">)+</span><span class="identifier-syntax">p</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">lookahead</span><span class="plain-syntax">-></span><span class="element-syntax">strut_number</span><span class="plain-syntax"> >= </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="identifier-syntax">wt</span><span class="plain-syntax"> = </span><span class="identifier-syntax">spos</span><span class="plain-syntax">[</span><span class="identifier-syntax">lookahead</span><span class="plain-syntax">-></span><span class="element-syntax">strut_number</span><span class="plain-syntax">]-1;</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">lookahead</span><span class="plain-syntax">-></span><span class="element-syntax">nt_pt</span><span class="plain-syntax">)</span>
|
|
<span class="plain-syntax"> && (</span><span class="identifier-syntax">pt</span><span class="plain-syntax">-></span><span class="element-syntax">negated_ptoken</span><span class="plain-syntax"> == </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">)</span>
|
|
<span class="plain-syntax"> && (</span><a href="4-to.html#SP17" class="function-link"><span class="function-syntax">Optimiser::ptoken_width</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">pt</span><span class="plain-syntax">) == </span><span class="constant-syntax">PTOKEN_ELASTIC</span><span class="plain-syntax">)) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">wt</span><span class="plain-syntax"> = -1;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">nonterminal</span><span class="plain-syntax"> *</span><span class="identifier-syntax">target</span><span class="plain-syntax"> = </span><span class="identifier-syntax">lookahead</span><span class="plain-syntax">-></span><span class="element-syntax">nt_pt</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">save_preform_lookahead_mode</span><span class="plain-syntax"> = </span><span class="identifier-syntax">preform_lookahead_mode</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">preform_lookahead_mode</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">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">j</span><span class="plain-syntax"> = </span><span class="identifier-syntax">wn</span><span class="plain-syntax">+1; </span><span class="identifier-syntax">j</span><span class="plain-syntax"> <= </span><a href="3-wrd.html#SP8" class="function-link"><span class="function-syntax">Wordings::last_wn</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">); </span><span class="identifier-syntax">j</span><span class="plain-syntax">++) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="4-prf.html#SP1" class="function-link"><span class="function-syntax">Preform::parse_nt_against_word_range</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">target</span><span class="plain-syntax">, </span><a href="3-wrd.html#SP6" class="function-link"><span class="function-syntax">Wordings::new</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">j</span><span class="plain-syntax">, </span><a href="3-wrd.html#SP8" class="function-link"><span class="function-syntax">Wordings::last_wn</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">W</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="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">pt</span><span class="plain-syntax">-></span><span class="element-syntax">nt_pt</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) ||</span>
|
|
<span class="plain-syntax"> (</span><a href="4-prf.html#SP1" class="function-link"><span class="function-syntax">Preform::parse_nt_against_word_range</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">pt</span><span class="plain-syntax">-></span><span class="element-syntax">nt_pt</span><span class="plain-syntax">, </span><a href="3-wrd.html#SP6" class="function-link"><span class="function-syntax">Wordings::new</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">wn</span><span class="plain-syntax">, </span><span class="identifier-syntax">j</span><span class="plain-syntax">-1), </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">wt</span><span class="plain-syntax"> = </span><span class="identifier-syntax">j</span><span class="plain-syntax">-1; </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> } </span><span class="reserved-syntax">else</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">fail_nonterminal_quantum</span><span class="plain-syntax"> > </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="identifier-syntax">j</span><span class="plain-syntax"> += </span><span class="identifier-syntax">fail_nonterminal_quantum</span><span class="plain-syntax"> - </span><span class="constant-syntax">1</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">preform_lookahead_mode</span><span class="plain-syntax"> = </span><span class="identifier-syntax">save_preform_lookahead_mode</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">wt</span><span class="plain-syntax"> < </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="reserved-syntax">goto</span><span class="plain-syntax"> </span><span class="identifier-syntax">FailThisStrutPosition</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">wt</span><span class="plain-syntax"> = </span><span class="identifier-syntax">wn</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="4-prf.html#SP1_2_1_2_3_3_3">§1.2.1.2.3.3.3</a>, <a href="4-prf.html#SP1_2_1_2_3_3_4">§1.2.1.2.3.3.4</a>, <a href="4-prf.html#SP1_2_1_2_3_3_5">§1.2.1.2.3.3.5</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP2"></a><b>§2. </b>Here we find the next possible match position for the strut beginning <span class="extract"><span class="extract-syntax">start</span></span>
|
|
and of width <span class="extract"><span class="extract-syntax">len</span></span> in words, which begins at word <span class="extract"><span class="extract-syntax">from</span></span> or after. Note that
|
|
the strut might run up right to the end of the input text: for example, in
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">neckties</span><span class="plain-syntax"> ... </span><span class="identifier-syntax">tied</span><span class="plain-syntax"> ***</span>
|
|
</pre>
|
|
<p class="commentary">the word "tied" is a strut, because the <span class="extract"><span class="extract-syntax">***</span></span> makes its position uncertain,
|
|
but since <span class="extract"><span class="extract-syntax">***</span></span> might match the empty text, "tied" might legally be the
|
|
last word in the input text.
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">Preform::next_strut_posn_after</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">Preform::next_strut_posn_after</span></span>:<br/><a href="4-prf.html#SP1_2_1_2_3_1">§1.2.1.2.3.1</a>, <a href="4-prf.html#SP1_2_1_2_3_2">§1.2.1.2.3.2</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">wording</span><span class="plain-syntax"> </span><span class="identifier-syntax">W</span><span class="plain-syntax">, </span><span class="reserved-syntax">ptoken</span><span class="plain-syntax"> *</span><span class="identifier-syntax">start</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">len</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">from</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">last_legal_position</span><span class="plain-syntax"> = </span><a href="3-wrd.html#SP8" class="function-link"><span class="function-syntax">Wordings::last_wn</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">) - </span><span class="identifier-syntax">len</span><span class="plain-syntax"> + </span><span class="constant-syntax">1</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">from</span><span class="plain-syntax"> <= </span><span class="identifier-syntax">last_legal_position</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">ptoken</span><span class="plain-syntax"> *</span><span class="identifier-syntax">pt</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">pos</span><span class="plain-syntax"> = </span><span class="identifier-syntax">from</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="identifier-syntax">pt</span><span class="plain-syntax"> = </span><span class="identifier-syntax">start</span><span class="plain-syntax">; </span><span class="identifier-syntax">pt</span><span class="plain-syntax">; </span><span class="identifier-syntax">pt</span><span class="plain-syntax"> = </span><span class="identifier-syntax">pt</span><span class="plain-syntax">-></span><span class="element-syntax">next_ptoken</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">pt</span><span class="plain-syntax">-></span><span class="element-syntax">ptoken_category</span><span class="plain-syntax"> == </span><span class="constant-syntax">FIXED_WORD_PTC</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="4-prf.html#SP3" class="function-link"><span class="function-syntax">Preform::parse_fixed_word_ptoken</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">pos</span><span class="plain-syntax">, </span><span class="identifier-syntax">pt</span><span class="plain-syntax">)) </span><span class="identifier-syntax">pos</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">break</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> } </span><span class="reserved-syntax">else</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">q</span><span class="plain-syntax"> = </span><a href="4-prf.html#SP1" class="function-link"><span class="function-syntax">Preform::parse_nt_against_word_range</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">pt</span><span class="plain-syntax">-></span><span class="element-syntax">nt_pt</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><a href="3-wrd.html#SP6" class="function-link"><span class="function-syntax">Wordings::new</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">pos</span><span class="plain-syntax">, </span><span class="identifier-syntax">pos</span><span class="plain-syntax">+</span><span class="identifier-syntax">pt</span><span class="plain-syntax">-></span><span class="element-syntax">nt_pt</span><span class="plain-syntax">-></span><span class="identifier-syntax">max_nt_words</span><span class="plain-syntax">-1),</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="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">pt</span><span class="plain-syntax">-></span><span class="element-syntax">negated_ptoken</span><span class="plain-syntax">) </span><span class="identifier-syntax">q</span><span class="plain-syntax"> = </span><span class="identifier-syntax">q</span><span class="plain-syntax">?</span><span class="identifier-syntax">FALSE:TRUE</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">q</span><span class="plain-syntax">) </span><span class="identifier-syntax">pos</span><span class="plain-syntax"> += </span><span class="identifier-syntax">pt</span><span class="plain-syntax">-></span><span class="element-syntax">nt_pt</span><span class="plain-syntax">-></span><span class="identifier-syntax">max_nt_words</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">break</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">pos</span><span class="plain-syntax">-</span><span class="identifier-syntax">from</span><span class="plain-syntax"> >= </span><span class="identifier-syntax">len</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">from</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">from</span><span class="plain-syntax">++;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> -1;</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP3"></a><b>§3. </b>Finally, a single fixed word, with its annotations and alternatives.
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">Preform::parse_fixed_word_ptoken</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">Preform::parse_fixed_word_ptoken</span></span>:<br/><a href="4-prf.html#SP1_2_1_2_2">§1.2.1.2.2</a>, <a href="4-prf.html#SP1_2_1_2_3_3_1">§1.2.1.2.3.3.1</a>, <a href="4-prf.html#SP2">§2</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">wn</span><span class="plain-syntax">, </span><span class="reserved-syntax">ptoken</span><span class="plain-syntax"> *</span><span class="identifier-syntax">pt</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">vocabulary_entry</span><span class="plain-syntax"> *</span><span class="identifier-syntax">ve</span><span class="plain-syntax"> = </span><a href="3-lxr.html#SP20" class="function-link"><span class="function-syntax">Lexer::word</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">wn</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">m</span><span class="plain-syntax"> = </span><span class="identifier-syntax">pt</span><span class="plain-syntax">-></span><span class="element-syntax">disallow_unexpected_upper</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">ptoken</span><span class="plain-syntax"> *</span><span class="identifier-syntax">alt</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="identifier-syntax">alt</span><span class="plain-syntax"> = </span><span class="identifier-syntax">pt</span><span class="plain-syntax">; </span><span class="identifier-syntax">alt</span><span class="plain-syntax">; </span><span class="identifier-syntax">alt</span><span class="plain-syntax"> = </span><span class="identifier-syntax">alt</span><span class="plain-syntax">-></span><span class="element-syntax">alternative_ptoken</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">ve</span><span class="plain-syntax"> == </span><span class="identifier-syntax">alt</span><span class="plain-syntax">-></span><span class="element-syntax">ve_pt</span><span class="plain-syntax">) &&</span>
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<span class="plain-syntax"> ((</span><span class="identifier-syntax">m</span><span class="plain-syntax"> == </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">) || (</span><a href="2-nw.html#SP4" class="function-link"><span class="function-syntax">Word::unexpectedly_upper_case</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">wn</span><span class="plain-syntax">) == </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">)))</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> (</span><span class="identifier-syntax">pt</span><span class="plain-syntax">-></span><span class="element-syntax">negated_ptoken</span><span class="plain-syntax">)?</span><span class="identifier-syntax">FALSE:TRUE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> (</span><span class="identifier-syntax">pt</span><span class="plain-syntax">-></span><span class="element-syntax">negated_ptoken</span><span class="plain-syntax">)?</span><span class="identifier-syntax">TRUE:FALSE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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</pre>
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