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<!--Weave of 'Numbered Words' 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>Numbered Words</b></li></ul></div>
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<p class="purpose">Some utilities for handling single words referred to by number.</p>
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<ul class="toc"><li><a href="4-nw.html#SP1">§1. Comparisons</a></li><li><a href="4-nw.html#SP3">§3. Correct use of text substitutions</a></li><li><a href="4-nw.html#SP5">§5. Casing and sentence division</a></li><li><a href="4-nw.html#SP8">§8. Dequoting literal text</a></li><li><a href="4-nw.html#SP9">§9. Dictionary words</a></li></ul><hr class="tocbar">
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<p class="commentary firstcommentary"><a id="SP1"></a><b>§1. Comparisons. </b>Comparison of the word at a given numbered position against some known
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word, say "rulebook", must be done very quickly. The whole point of the
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vocabulary bank identifying each distinct word was to enable this to be
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done by a single comparison of pointers: and to avoid the overhead of a
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function call, we perform this with macros.
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</p>
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<pre class="definitions code-font"><span class="definition-keyword">define</span> <span class="identifier-syntax">compare_word</span><span class="plain-syntax">(</span><span class="identifier-syntax">w</span><span class="plain-syntax">, </span><span class="identifier-syntax">voc</span><span class="plain-syntax">) (</span><a href="3-lxr.html#SP18" class="function-link"><span class="function-syntax">Lexer::word</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">w</span><span class="plain-syntax">) == (</span><span class="identifier-syntax">voc</span><span class="plain-syntax">))</span>
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<span class="definition-keyword">define</span> <span class="identifier-syntax">compare_words</span><span class="plain-syntax">(</span><span class="identifier-syntax">w1</span><span class="plain-syntax">, </span><span class="identifier-syntax">w2</span><span class="plain-syntax">) (</span><a href="3-lxr.html#SP18" class="function-link"><span class="function-syntax">Lexer::word</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">w1</span><span class="plain-syntax">) == </span><a href="3-lxr.html#SP18" class="function-link"><span class="function-syntax">Lexer::word</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">w2</span><span class="plain-syntax">))</span>
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<span class="definition-keyword">define</span> <span class="identifier-syntax">compare_words_cs</span><span class="plain-syntax">(</span><span class="identifier-syntax">w1</span><span class="plain-syntax">, </span><span class="identifier-syntax">w2</span><span class="plain-syntax">) (</span><span class="identifier-syntax">Wide::cmp</span><span class="plain-syntax">(</span><a href="3-lxr.html#SP18" class="function-link"><span class="function-syntax">Lexer::word_raw_text</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">w1</span><span class="plain-syntax">), </span><a href="3-lxr.html#SP18" class="function-link"><span class="function-syntax">Lexer::word_raw_text</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">w2</span><span class="plain-syntax">)) == </span><span class="constant-syntax">0</span><span class="plain-syntax">)</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP2"></a><b>§2. </b>We can also, more slowly, perform a direct string comparison. If carried
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out on the original, raw, text, this will be case sensitive — which is
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usually wrong for Inform purposes. On the treated text, however, we are
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comparing a case-normalised version of the original word, which is likely
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to be safely case insensitive comparison, provided that the content of <span class="extract"><span class="extract-syntax">t</span></span>
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is also normalised.
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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="function-syntax">Word::compare_by_strcmp</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">Word::compare_by_strcmp</span></span>:<br/>Basic Nonterminals - <a href="4-bn.html#SP7">§7</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">w</span><span class="plain-syntax">, </span><span class="identifier-syntax">wchar_t</span><span class="plain-syntax"> *</span><span class="identifier-syntax">t</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">Wide::cmp</span><span class="plain-syntax">(</span><a href="3-lxr.html#SP18" class="function-link"><span class="function-syntax">Lexer::word_text</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">w</span><span class="plain-syntax">), </span><span class="identifier-syntax">t</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>
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<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">Word::compare_raw_by_strcmp</span><span class="plain-syntax">(</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">w</span><span class="plain-syntax">, </span><span class="identifier-syntax">wchar_t</span><span class="plain-syntax"> *</span><span class="identifier-syntax">t</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">Wide::cmp</span><span class="plain-syntax">(</span><a href="3-lxr.html#SP18" class="function-link"><span class="function-syntax">Lexer::word_raw_text</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">w</span><span class="plain-syntax">), </span><span class="identifier-syntax">t</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>
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</pre>
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<p class="commentary firstcommentary"><a id="SP3"></a><b>§3. Correct use of text substitutions. </b>If a "word" is going to be quoted literal text, then it has to use the
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characters <span class="extract"><span class="extract-syntax">[</span></span> and <span class="extract"><span class="extract-syntax">]</span></span> in a matched way, and without nesting them. The
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following verifies that.
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</p>
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<p class="commentary">These rules are quite strict. It could be argued that nested brackets should be
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allowed, allowing comments in text substitutions, but the result would be hard
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to read and tricky for the user interface applications to syntax-colour.
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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="function-syntax">Word::well_formed_text_routine</span><span class="plain-syntax">(</span><span class="identifier-syntax">wchar_t</span><span class="plain-syntax"> *</span><span class="identifier-syntax">fw</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">i</span><span class="plain-syntax">, </span><span class="identifier-syntax">escaped</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NOT_APPLICABLE</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">i</span><span class="plain-syntax">=0; </span><span class="identifier-syntax">fw</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">] != </span><span class="constant-syntax">0</span><span class="plain-syntax">; </span><span class="identifier-syntax">i</span><span class="plain-syntax">++) {</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">fw</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">] == </span><span class="constant-syntax">TEXT_SUBSTITUTION_BEGIN</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">escaped</span><span class="plain-syntax"> == </span><span class="identifier-syntax">TRUE</span><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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<span class="plain-syntax"> </span><span class="identifier-syntax">escaped</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>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">fw</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">] == </span><span class="constant-syntax">TEXT_SUBSTITUTION_END</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">escaped</span><span class="plain-syntax"> != </span><span class="identifier-syntax">TRUE</span><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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<span class="plain-syntax"> </span><span class="identifier-syntax">escaped</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>
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<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">escaped</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NOT_APPLICABLE</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">escaped</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">escaped</span><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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<span class="plain-syntax"> </span><span class="reserved-syntax">return</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>
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<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">Word::perhaps_ill_formed_text_routine</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">Word::perhaps_ill_formed_text_routine</span></span>:<br/>Vocabulary - <a href="2-vcb.html#SP16">§16</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">wchar_t</span><span class="plain-syntax"> *</span><span class="identifier-syntax">fw</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">i</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">i</span><span class="plain-syntax">=0; </span><span class="identifier-syntax">fw</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">] != </span><span class="constant-syntax">0</span><span class="plain-syntax">; </span><span class="identifier-syntax">i</span><span class="plain-syntax">++) {</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">fw</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">] == </span><span class="constant-syntax">TEXT_SUBSTITUTION_BEGIN</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</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">fw</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">] == </span><span class="constant-syntax">TEXT_SUBSTITUTION_END</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</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>
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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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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP4"></a><b>§4. </b>Not to be done lightly: the output can be enormous.
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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">void</span><span class="plain-syntax"> </span><span class="function-syntax">Word::log_lexer_output</span><span class="plain-syntax">(</span><span class="reserved-syntax">void</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">LOG</span><span class="plain-syntax">(</span><span class="string-syntax">"Entire lexer output to date:\n"</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="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax">=0; </span><span class="identifier-syntax">i</span><span class="plain-syntax"><</span><span class="identifier-syntax">lexer_wordcount</span><span class="plain-syntax">; </span><span class="identifier-syntax">i</span><span class="plain-syntax">++)</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">LOG</span><span class="plain-syntax">(</span><span class="string-syntax">"%d: <%+N> <%N> <%02x>\n"</span><span class="plain-syntax">, </span><span class="identifier-syntax">i</span><span class="plain-syntax">, </span><span class="identifier-syntax">i</span><span class="plain-syntax">, </span><span class="identifier-syntax">i</span><span class="plain-syntax">, </span><a href="3-lxr.html#SP18" class="function-link"><span class="function-syntax">Lexer::break_before</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">i</span><span class="plain-syntax">));</span>
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<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>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP5"></a><b>§5. Casing and sentence division. </b>Casing is only sometimes informative in English: for the first word in
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a sentence, we expect to find an upper-case letter, so that there is no
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easy way to tell the name of a person or institution from a common noun.
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But in other cases an upper case initial letter is unexpected, and can
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tell us something.
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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="function-syntax">Word::unexpectedly_upper_case</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">Word::unexpectedly_upper_case</span></span>:<br/>Word Assemblages - <a href="2-wa.html#SP11">§11</a><br/>Preform - <a href="4-prf.html#SP52">§52</a><br/>Basic Nonterminals - <a href="4-bn.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>
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<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"><1) </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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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">compare_word</span><span class="plain-syntax">(</span><span class="identifier-syntax">wn</span><span class="plain-syntax">-1, </span><span class="identifier-syntax">FULLSTOP_V</span><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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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">compare_word</span><span class="plain-syntax">(</span><span class="identifier-syntax">wn</span><span class="plain-syntax">-1, </span><span class="identifier-syntax">PARBREAK_V</span><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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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">compare_word</span><span class="plain-syntax">(</span><span class="identifier-syntax">wn</span><span class="plain-syntax">-1, </span><span class="identifier-syntax">COLON_V</span><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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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">isupper</span><span class="plain-syntax">(*(</span><a href="3-lxr.html#SP18" class="function-link"><span class="function-syntax">Lexer::word_raw_text</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">if</span><span class="plain-syntax"> (</span><a href="4-nw.html#SP7" class="function-link"><span class="function-syntax">Word::text_ending_sentence</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">wn</span><span class="plain-syntax">-1)) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">TRUE</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"> </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP6"></a><b>§6. </b>Is the word at <span class="extract"><span class="extract-syntax">wn</span></span> in single quotes? Count the number at the ends.
|
|
</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">Word::singly_quoted</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">) {</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"><1) </span><span class="reserved-syntax">return</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">wchar_t</span><span class="plain-syntax"> *</span><span class="identifier-syntax">p</span><span class="plain-syntax"> = </span><a href="3-lxr.html#SP18" class="function-link"><span class="function-syntax">Lexer::word_raw_text</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">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">qc</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">p</span><span class="plain-syntax">[0] == </span><span class="character-syntax">'\''</span><span class="plain-syntax">) </span><span class="identifier-syntax">qc</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">Wide::len</span><span class="plain-syntax">(</span><span class="identifier-syntax">p</span><span class="plain-syntax">) > </span><span class="constant-syntax">1</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">p</span><span class="plain-syntax">[</span><span class="identifier-syntax">Wide::len</span><span class="plain-syntax">(</span><span class="identifier-syntax">p</span><span class="plain-syntax">)-1] == </span><span class="character-syntax">'\''</span><span class="plain-syntax">)) </span><span class="identifier-syntax">qc</span><span class="plain-syntax">++;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">qc</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP7"></a><b>§7. </b>Does the word at <span class="extract"><span class="extract-syntax">wn</span></span> appear to be a piece of quoted text which, because
|
|
it ends with punctuation, may also end the sentence which quotes it?
|
|
</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">Word::text_ending_sentence</span><button class="popup" onclick="togglePopup('usagePopup4')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup4">Usage of <span class="code-font"><span class="function-syntax">Word::text_ending_sentence</span></span>:<br/><a href="4-nw.html#SP5">§5</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="plain-syntax"> </span><span class="identifier-syntax">wchar_t</span><span class="plain-syntax"> *</span><span class="identifier-syntax">p</span><span class="plain-syntax"> = </span><a href="3-lxr.html#SP18" class="function-link"><span class="function-syntax">Lexer::word_raw_text</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">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">p</span><span class="plain-syntax">[0] != </span><span class="character-syntax">'"'</span><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>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">p</span><span class="plain-syntax"> += </span><span class="identifier-syntax">Wide::len</span><span class="plain-syntax">(</span><span class="identifier-syntax">p</span><span class="plain-syntax">) - </span><span class="constant-syntax">2</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">[0] == </span><span class="character-syntax">'.'</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">p</span><span class="plain-syntax">[1] == </span><span class="character-syntax">'"'</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</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">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">p</span><span class="plain-syntax">[0] == </span><span class="character-syntax">'?'</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">p</span><span class="plain-syntax">[1] == </span><span class="character-syntax">'"'</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</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">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">p</span><span class="plain-syntax">[0] == </span><span class="character-syntax">'!'</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">p</span><span class="plain-syntax">[1] == </span><span class="character-syntax">'"'</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</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">p</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">[0] == </span><span class="character-syntax">'.'</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">p</span><span class="plain-syntax">[1] == </span><span class="character-syntax">')'</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">p</span><span class="plain-syntax">[2] == </span><span class="character-syntax">'"'</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</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">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">p</span><span class="plain-syntax">[0] == </span><span class="character-syntax">'?'</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">p</span><span class="plain-syntax">[1] == </span><span class="character-syntax">')'</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">p</span><span class="plain-syntax">[2] == </span><span class="character-syntax">'"'</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</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">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">p</span><span class="plain-syntax">[0] == </span><span class="character-syntax">'!'</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">p</span><span class="plain-syntax">[1] == </span><span class="character-syntax">')'</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">p</span><span class="plain-syntax">[2] == </span><span class="character-syntax">'"'</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</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">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">p</span><span class="plain-syntax">[0] == </span><span class="character-syntax">'.'</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">p</span><span class="plain-syntax">[1] == </span><span class="character-syntax">'\''</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">p</span><span class="plain-syntax">[2] == </span><span class="character-syntax">'"'</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</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">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">p</span><span class="plain-syntax">[0] == </span><span class="character-syntax">'?'</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">p</span><span class="plain-syntax">[1] == </span><span class="character-syntax">'\''</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">p</span><span class="plain-syntax">[2] == </span><span class="character-syntax">'"'</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</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">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">p</span><span class="plain-syntax">[0] == </span><span class="character-syntax">'!'</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">p</span><span class="plain-syntax">[1] == </span><span class="character-syntax">'\''</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">p</span><span class="plain-syntax">[2] == </span><span class="character-syntax">'"'</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP8"></a><b>§8. Dequoting literal text. </b>A utility for stripping double-quotes from literal text, along with
|
|
initial or trailing spaces inside those quotes.
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Word::dequote</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">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">wchar_t</span><span class="plain-syntax"> *</span><span class="identifier-syntax">previous_text</span><span class="plain-syntax"> = </span><a href="3-lxr.html#SP18" class="function-link"><span class="function-syntax">Lexer::word_text</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="identifier-syntax">wchar_t</span><span class="plain-syntax"> *</span><span class="identifier-syntax">dequoted_text</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">previous_text</span><span class="plain-syntax">[0] != </span><span class="character-syntax">'"'</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><a href="3-lxr.html#SP18" class="function-link"><span class="function-syntax">Lexer::set_word_raw_text</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">wn</span><span class="plain-syntax">, </span><a href="3-lxr.html#SP14" class="function-link"><span class="function-syntax">Lexer::copy_to_memory</span></a><span class="plain-syntax">(</span><a href="3-lxr.html#SP18" class="function-link"><span class="function-syntax">Lexer::word_raw_text</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="identifier-syntax">dequoted_text</span><span class="plain-syntax"> = </span><span class="identifier-syntax">previous_text</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">dequoted_text</span><span class="plain-syntax">) == </span><span class="character-syntax">' '</span><span class="plain-syntax">) </span><span class="identifier-syntax">dequoted_text</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">Wide::len</span><span class="plain-syntax">(</span><span class="identifier-syntax">dequoted_text</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">dequoted_text</span><span class="plain-syntax">+</span><span class="identifier-syntax">Wide::len</span><span class="plain-syntax">(</span><span class="identifier-syntax">dequoted_text</span><span class="plain-syntax">)-1) == </span><span class="character-syntax">'"'</span><span class="plain-syntax">))</span>
|
|
<span class="plain-syntax"> *(</span><span class="identifier-syntax">dequoted_text</span><span class="plain-syntax">+</span><span class="identifier-syntax">Wide::len</span><span class="plain-syntax">(</span><span class="identifier-syntax">dequoted_text</span><span class="plain-syntax">)-1) = </span><span class="constant-syntax">0</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">Wide::len</span><span class="plain-syntax">(</span><span class="identifier-syntax">dequoted_text</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">dequoted_text</span><span class="plain-syntax">+</span><span class="identifier-syntax">Wide::len</span><span class="plain-syntax">(</span><span class="identifier-syntax">dequoted_text</span><span class="plain-syntax">)-1) == </span><span class="character-syntax">' '</span><span class="plain-syntax">))</span>
|
|
<span class="plain-syntax"> *(</span><span class="identifier-syntax">dequoted_text</span><span class="plain-syntax">+</span><span class="identifier-syntax">Wide::len</span><span class="plain-syntax">(</span><span class="identifier-syntax">dequoted_text</span><span class="plain-syntax">)-1) = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><a href="3-lxr.html#SP18" class="function-link"><span class="function-syntax">Lexer::set_word_text</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">wn</span><span class="plain-syntax">, </span><span class="identifier-syntax">dequoted_text</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">LOGIF</span><span class="plain-syntax">(</span><span class="identifier-syntax">VOCABULARY</span><span class="plain-syntax">, </span><span class="string-syntax">"Dequoting word %d <%w> to <%w>\n"</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">previous_text</span><span class="plain-syntax">, </span><span class="identifier-syntax">dequoted_text</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="2-vcb.html#SP4" class="function-link"><span class="function-syntax">Vocabulary::identify_word</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">wn</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="2-vcb.html#SP7" class="function-link"><span class="function-syntax">Vocabulary::set_raw_exemplar_to_text</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">wn</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP9"></a><b>§9. Dictionary words. </b>We take a wide Unicode string and compile an I6 dictionary word constant
|
|
to lodge the same text into the virtual machine's parsing dictionary.
|
|
</p>
|
|
|
|
<p class="commentary">A legal I6 dictionary word can take several forms: it can be in single
|
|
quotes, <span class="extract"><span class="extract-syntax">'thus'</span></span>, but only if it is more than one character long, since
|
|
<span class="extract"><span class="extract-syntax">'t'</span></span> would be the character value of lower-case T instead. (Or it can be
|
|
double-quoted <span class="extract"><span class="extract-syntax">"so"</span></span>, but only in grammar or properties; this usage is
|
|
deprecated and we avoid it.) Within the dictionary word, <span class="extract"><span class="extract-syntax">^</span></span> is an escape
|
|
character meaning a literal single quote, and the notation <span class="extract"><span class="extract-syntax">@{xx}</span></span> is an
|
|
escape meaning the character with hexadecimal value <span class="extract"><span class="extract-syntax">xx</span></span>.
|
|
</p>
|
|
|
|
<p class="commentary">Optionally, a dictionary word can end with a pair of slashes and then,
|
|
optionally again, markers to indicate that the word is (for instance) a
|
|
plural: thus <span class="extract"><span class="extract-syntax">'newts//p'</span></span>. Using no markers, as in <span class="extract"><span class="extract-syntax">'toads//'</span></span>, makes a
|
|
word equivalent to that without a marker, but avoids the single-letter
|
|
problem — so the preferred modern way to write a single-character I6
|
|
dictionary word is <span class="extract"><span class="extract-syntax">'t//'</span></span>, and this is what the following routine does.
|
|
(Note the exceptional case where the word consists only of a <span class="extract"><span class="extract-syntax">'/'</span></span>: here
|
|
we cannot write <span class="extract"><span class="extract-syntax">'///'</span></span> because I6 reads this as <span class="extract"><span class="extract-syntax">//</span></span> plus an invalid
|
|
marker <span class="extract"><span class="extract-syntax">/</span></span>, and throws an error. We escape the single <span class="extract"><span class="extract-syntax">/</span></span> to avoid this.
|
|
In all other cases there's no need to escape a <span class="extract"><span class="extract-syntax">/</span></span>.)
|
|
</p>
|
|
|
|
<p class="commentary">Dictionary words with a literal <span class="extract"><span class="extract-syntax">~</span></span> in are, as it happens, not parsable
|
|
by the Z-machine, but the code below — employing the <span class="extract"><span class="extract-syntax">@{7E}</span></span>
|
|
escape — is in principle legal, and it does work on Glulx.
|
|
</p>
|
|
|
|
<p class="commentary">Very long words can safely be truncated since the virtual machines do not
|
|
have indefinitely long dictionary resolution anyway, and we had better do
|
|
so because I6 rejects overlong text between single quotation marks.
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Word::compile_to_I6_dictionary</span><button class="popup" onclick="togglePopup('usagePopup5')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup5">Usage of <span class="code-font"><span class="function-syntax">Word::compile_to_I6_dictionary</span></span>:<br/>Lexer - <a href="3-lxr.html#SP18">§18</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">OUTPUT_STREAM</span><span class="plain-syntax">, </span><span class="identifier-syntax">wchar_t</span><span class="plain-syntax"> *</span><span class="identifier-syntax">p</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">pluralise</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">c</span><span class="plain-syntax">, </span><span class="identifier-syntax">n</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">WRITE</span><span class="plain-syntax">(</span><span class="string-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">c</span><span class="plain-syntax">=0; </span><span class="identifier-syntax">p</span><span class="plain-syntax">[</span><span class="identifier-syntax">c</span><span class="plain-syntax">] != </span><span class="constant-syntax">0</span><span class="plain-syntax">; </span><span class="identifier-syntax">c</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">p</span><span class="plain-syntax">[</span><span class="identifier-syntax">c</span><span class="plain-syntax">]) {</span>
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|
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="character-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">[1] == </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"@{2F}"</span><span class="plain-syntax">); </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"/"</span><span class="plain-syntax">); </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="character-syntax">'\''</span><span class="plain-syntax">: </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"^"</span><span class="plain-syntax">); </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="character-syntax">'^'</span><span class="plain-syntax">: </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"@{5E}"</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="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="character-syntax">'~'</span><span class="plain-syntax">: </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"@{7E}"</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="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="character-syntax">'@'</span><span class="plain-syntax">: </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"@{40}"</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="identifier-syntax">default:</span><span class="plain-syntax"> </span><span class="identifier-syntax">PUT</span><span class="plain-syntax">(</span><span class="identifier-syntax">p</span><span class="plain-syntax">[</span><span class="identifier-syntax">c</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">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">n</span><span class="plain-syntax">++ > </span><span class="constant-syntax">32</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>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">pluralise</span><span class="plain-syntax">) </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"//p"</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="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Wide::len</span><span class="plain-syntax">(</span><span class="identifier-syntax">p</span><span class="plain-syntax">) == </span><span class="constant-syntax">1</span><span class="plain-syntax">) </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"//"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"'"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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</pre>
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