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<main role="main">
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<!--Weave of 'Unicode Literals' 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="../inform7n.html">Inform7</a></li><li><a href="index.html">values</a></li><li><a href="index.html#3">Chapter 3: Literals</a></li><li><b>Unicode Literals</b></li></ul></div>
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<p class="purpose">To manage the names assigned to Unicode character values.</p>
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. </b>The following is called only on excerpts from the source where it is a
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fairly safe bet that a Unicode character is referred to. For example, when
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the player types either of these:
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</p>
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<blockquote>
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<p>"[unicode 321]odz Churchyard"</p>
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</blockquote>
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<blockquote>
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<p>"[unicode Latin capital letter L with stroke]odz Churchyard"</p>
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</blockquote>
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<p class="commentary">...then the text after the word "unicode" is parsed by <s-unicode-character>.
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</p>
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<pre class="Preform-displayed-code all-displayed-code code-font">
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<span class="Preform-function-syntax"><s-unicode-character></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">::=</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><cardinal-number-unlimited></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> { -, Rvalues::from_Unicode(UnicodeLiterals::max(R[1]), W) }</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><unicode-character-name></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> { -, Rvalues::from_Unicode(R[1], W) }</span>
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<span class="Preform-function-syntax"><unicode-character-name></span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">internal</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">{</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">parse_node</span><span class="Preform-plain-syntax"> *</span><span class="Preform-identifier-syntax">p</span><span class="Preform-plain-syntax"> = </span><span class="Preform-identifier-syntax">Lexicon::retrieve</span><span class="Preform-plain-syntax">(</span><span class="Preform-identifier-syntax">MISCELLANEOUS_MC</span><span class="Preform-plain-syntax">, </span><span class="Preform-identifier-syntax">W</span><span class="Preform-plain-syntax">);</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">if</span><span class="Preform-plain-syntax"> ((</span><span class="Preform-identifier-syntax">p</span><span class="Preform-plain-syntax">) && (</span><span class="Preform-identifier-syntax">Node::get_type</span><span class="Preform-plain-syntax">(</span><span class="Preform-identifier-syntax">p</span><span class="Preform-plain-syntax">) == </span><span class="Preform-identifier-syntax">PROPER_NOUN_NT</span><span class="Preform-plain-syntax">)) {</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">int</span><span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">N</span><span class="Preform-plain-syntax"> = </span><span class="Preform-identifier-syntax">Vocabulary::get_literal_number_value</span><span class="Preform-plain-syntax">(</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">Lexer::word</span><span class="Preform-plain-syntax">(</span><span class="Preform-identifier-syntax">Wordings::first_wn</span><span class="Preform-plain-syntax">(</span><span class="Preform-identifier-syntax">Node::get_text</span><span class="Preform-plain-syntax">(</span><span class="Preform-identifier-syntax">p</span><span class="Preform-plain-syntax">))));</span>
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<span class="Preform-plain-syntax"> ==> { </span><span class="Preform-identifier-syntax">N</span><span class="Preform-plain-syntax">, - };</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">return</span><span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">TRUE</span><span class="Preform-plain-syntax">;</span>
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<span class="Preform-plain-syntax"> }</span>
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<span class="Preform-plain-syntax"> ==> { </span><span class="Preform-identifier-syntax">fail</span><span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">nonterminal</span><span class="Preform-plain-syntax"> };</span>
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<span class="Preform-plain-syntax">}</span>
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</pre>
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<ul class="endnotetexts"><li>This is <a href="../words-module/4-ap.html" class="internal">Preform grammar</a>, not regular C code.</li></ul>
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<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>§2. </b>And here is the range check:
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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">UnicodeLiterals::max</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">UnicodeLiterals::max</span></span>:<br/><a href="3-ul.html#SP1">§1</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">cc</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">cc</span><span class="plain-syntax"> < </span><span class="constant-syntax">0</span><span class="plain-syntax">) || (</span><span class="identifier-syntax">cc</span><span class="plain-syntax"> >= </span><span class="constant-syntax">0x10000</span><span class="plain-syntax">)) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">StandardProblems::sentence_problem</span><span class="plain-syntax">(</span><span class="identifier-syntax">Task::syntax_tree</span><span class="plain-syntax">(), </span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_UnicodeOutOfRange</span><span class="plain-syntax">),</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"Inform can only handle Unicode characters in the 16-bit range"</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"from 0 to 65535."</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="constant-syntax">65</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">cc</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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</pre>
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