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<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../extensions.html">Kits</a></li><li><a href="index.html">Architecture16Kit</a></li><li><b>Character Set Template</b></li></ul></div>
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<p class="purpose">Code relating to the ZSCII character set.</p>
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<ul class="toc"><li><a href="S-cs.html#SP3">§3. ZSCII Casing Tables</a></li></ul><hr class="tocbar">
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. </b>The old Inform 7 template defined the following constant for the benefit,
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presumably, of conditional compilation. It's probably no longer useful.
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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">Constant</span><span class="plain-syntax"> </span><span class="identifier-syntax">ZSCII_Tables</span><span class="plain-syntax">;</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>§2. </b>We must create two arrays:
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</p>
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<ul class="items"><li>(i) <span class="extract"><span class="extract-syntax">CharCasingChart0</span></span>, a table indicating lower-case letters with
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transitions to convert them to upper case;
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</li><li>(ii) <span class="extract"><span class="extract-syntax">CharCasingChart1</span></span>, vice versa.
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</li></ul>
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<p class="commentary">Each array is a sequence of three-word records, consisting of the start of
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a character range, the size of the range (the number of characters in it),
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and the numerical offset to convert to the opposite case. For instance,
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the sequence \((97, 26, -32)\) means the 26 lower-case letters "a" to "z",
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and marks them as convertible to upper case by subtracting 32 from the
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character code (so "a", 97, becomes "A", 65). If the size of the
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range is negative, this indicates that only every alternate code is valid.
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(This makes for efficient storage since there are large parts of the
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Unicode number-space in which upper and lower case letters alternate.)
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</p>
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<p class="commentary">An offset of <span class="extract"><span class="extract-syntax">UNIC_NCT</span></span> means no case change is possible; and any character
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not included in the ranges below is not a letter.
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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">Constant</span><span class="plain-syntax"> </span><span class="identifier-syntax">UNIC_NCT</span><span class="plain-syntax"> = </span><span class="constant-syntax">10000</span><span class="plain-syntax">;</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP3" class="paragraph-anchor"></a><b>§3. ZSCII Casing Tables. </b></p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">Array</span><span class="plain-syntax"> </span><span class="identifier-syntax">CharCasingChart0</span><span class="plain-syntax"> --></span>
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<span class="plain-syntax"> </span><span class="constant-syntax">$0061</span><span class="plain-syntax"> ( </span><span class="constant-syntax">26</span><span class="plain-syntax">) ( -32) </span><span class="constant-syntax">$009b</span><span class="plain-syntax"> ( </span><span class="constant-syntax">3</span><span class="plain-syntax">) ( </span><span class="constant-syntax">3</span><span class="plain-syntax">) </span><span class="constant-syntax">$00a1</span><span class="plain-syntax"> ( </span><span class="constant-syntax">1</span><span class="plain-syntax">) </span><span class="identifier-syntax">UNIC_NCT</span>
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<span class="plain-syntax"> </span><span class="constant-syntax">$00a4</span><span class="plain-syntax"> ( </span><span class="constant-syntax">2</span><span class="plain-syntax">) ( </span><span class="constant-syntax">3</span><span class="plain-syntax">) </span><span class="constant-syntax">$00a6</span><span class="plain-syntax"> ( </span><span class="constant-syntax">1</span><span class="plain-syntax">) </span><span class="identifier-syntax">UNIC_NCT</span><span class="plain-syntax"> </span><span class="constant-syntax">$00a9</span><span class="plain-syntax"> ( </span><span class="constant-syntax">6</span><span class="plain-syntax">) ( </span><span class="constant-syntax">6</span><span class="plain-syntax">)</span>
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<span class="plain-syntax"> </span><span class="constant-syntax">$00b5</span><span class="plain-syntax"> ( </span><span class="constant-syntax">5</span><span class="plain-syntax">) ( </span><span class="constant-syntax">5</span><span class="plain-syntax">) </span><span class="constant-syntax">$00bf</span><span class="plain-syntax"> ( </span><span class="constant-syntax">5</span><span class="plain-syntax">) ( </span><span class="constant-syntax">5</span><span class="plain-syntax">) </span><span class="constant-syntax">$00c9</span><span class="plain-syntax"> ( -3) ( </span><span class="constant-syntax">1</span><span class="plain-syntax">)</span>
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<span class="plain-syntax"> </span><span class="constant-syntax">$00cd</span><span class="plain-syntax"> ( </span><span class="constant-syntax">3</span><span class="plain-syntax">) ( </span><span class="constant-syntax">3</span><span class="plain-syntax">) </span><span class="constant-syntax">$00d3</span><span class="plain-syntax"> ( -3) ( </span><span class="constant-syntax">1</span><span class="plain-syntax">) </span><span class="constant-syntax">$00d7</span><span class="plain-syntax"> ( </span><span class="constant-syntax">2</span><span class="plain-syntax">) ( </span><span class="constant-syntax">2</span><span class="plain-syntax">)</span>
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<span class="plain-syntax"> </span><span class="constant-syntax">$00dc</span><span class="plain-syntax"> ( </span><span class="constant-syntax">1</span><span class="plain-syntax">) ( </span><span class="constant-syntax">1</span><span class="plain-syntax">) </span><span class="constant-syntax">$0000</span>
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<span class="plain-syntax">;</span>
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<span class="reserved-syntax">Array</span><span class="plain-syntax"> </span><span class="identifier-syntax">CharCasingChart1</span><span class="plain-syntax"> --></span>
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<span class="plain-syntax"> </span><span class="constant-syntax">$0041</span><span class="plain-syntax"> ( </span><span class="constant-syntax">26</span><span class="plain-syntax">) ( </span><span class="constant-syntax">32</span><span class="plain-syntax">) </span><span class="constant-syntax">$009e</span><span class="plain-syntax"> ( </span><span class="constant-syntax">3</span><span class="plain-syntax">) ( -3) </span><span class="constant-syntax">$00a7</span><span class="plain-syntax"> ( </span><span class="constant-syntax">2</span><span class="plain-syntax">) ( -3)</span>
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<span class="plain-syntax"> </span><span class="constant-syntax">$00af</span><span class="plain-syntax"> ( </span><span class="constant-syntax">6</span><span class="plain-syntax">) ( -6) </span><span class="constant-syntax">$00ba</span><span class="plain-syntax"> ( </span><span class="constant-syntax">5</span><span class="plain-syntax">) ( -5) </span><span class="constant-syntax">$00c4</span><span class="plain-syntax"> ( </span><span class="constant-syntax">5</span><span class="plain-syntax">) ( -5)</span>
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<span class="plain-syntax"> </span><span class="constant-syntax">$00ca</span><span class="plain-syntax"> ( -3) ( -1) </span><span class="constant-syntax">$00d0</span><span class="plain-syntax"> ( </span><span class="constant-syntax">3</span><span class="plain-syntax">) ( -3) </span><span class="constant-syntax">$00d4</span><span class="plain-syntax"> ( -3) ( -1)</span>
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<span class="plain-syntax"> </span><span class="constant-syntax">$00d9</span><span class="plain-syntax"> ( </span><span class="constant-syntax">2</span><span class="plain-syntax">) ( -2) </span><span class="constant-syntax">$00dd</span><span class="plain-syntax"> ( </span><span class="constant-syntax">1</span><span class="plain-syntax">) ( -1) </span><span class="constant-syntax">$0000</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" class="paragraph-anchor"></a><b>§4. </b>The following are the equivalent of <span class="extract"><span class="extract-syntax">tolower</span></span> and <span class="extract"><span class="extract-syntax">toupper</span></span>, the traditional
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C library functions for forcing letters into lower and upper case form, for
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the ZSCII character set.
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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="identifier-syntax">VM_UpperToLowerCase</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">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">c</span><span class="plain-syntax"> < </span><span class="character-syntax">'A'</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</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">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">c</span><span class="plain-syntax"> <= </span><span class="character-syntax">'Z'</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">c</span><span class="plain-syntax"> + </span><span class="constant-syntax">32</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">c</span><span class="plain-syntax"> < </span><span class="constant-syntax">158</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</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">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">c</span><span class="plain-syntax"> <= </span><span class="constant-syntax">160</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">c</span><span class="plain-syntax"> - </span><span class="constant-syntax">3</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">c</span><span class="plain-syntax"> < </span><span class="constant-syntax">167</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</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">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">c</span><span class="plain-syntax"> <= </span><span class="constant-syntax">168</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">c</span><span class="plain-syntax"> - </span><span class="constant-syntax">3</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">c</span><span class="plain-syntax"> < </span><span class="constant-syntax">175</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</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">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">c</span><span class="plain-syntax"> <= </span><span class="constant-syntax">180</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">c</span><span class="plain-syntax"> - </span><span class="constant-syntax">6</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">c</span><span class="plain-syntax"> < </span><span class="constant-syntax">186</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</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">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">c</span><span class="plain-syntax"> <= </span><span class="constant-syntax">190</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">c</span><span class="plain-syntax"> - </span><span class="constant-syntax">5</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">c</span><span class="plain-syntax"> < </span><span class="constant-syntax">196</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</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">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">c</span><span class="plain-syntax"> <= </span><span class="constant-syntax">200</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">c</span><span class="plain-syntax"> - </span><span class="constant-syntax">5</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">c</span><span class="plain-syntax"> == </span><span class="constant-syntax">202</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">c</span><span class="plain-syntax"> - </span><span class="constant-syntax">1</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">c</span><span class="plain-syntax"> == </span><span class="constant-syntax">204</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">c</span><span class="plain-syntax"> - </span><span class="constant-syntax">1</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">c</span><span class="plain-syntax"> < </span><span class="constant-syntax">208</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</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">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">c</span><span class="plain-syntax"> <= </span><span class="constant-syntax">210</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">c</span><span class="plain-syntax"> - </span><span class="constant-syntax">3</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">c</span><span class="plain-syntax"> == </span><span class="constant-syntax">212</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">c</span><span class="plain-syntax"> - </span><span class="constant-syntax">1</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">c</span><span class="plain-syntax"> == </span><span class="constant-syntax">214</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">c</span><span class="plain-syntax"> - </span><span class="constant-syntax">1</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">c</span><span class="plain-syntax"> == </span><span class="constant-syntax">217</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">c</span><span class="plain-syntax"> - </span><span class="constant-syntax">2</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">c</span><span class="plain-syntax"> == </span><span class="constant-syntax">218</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">c</span><span class="plain-syntax"> - </span><span class="constant-syntax">2</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">c</span><span class="plain-syntax"> == </span><span class="constant-syntax">221</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">c</span><span class="plain-syntax"> - </span><span class="constant-syntax">1</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">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="identifier-syntax">VM_LowerToUpperCase</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">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">c</span><span class="plain-syntax"> < </span><span class="character-syntax">'a'</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</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">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">c</span><span class="plain-syntax"> <= </span><span class="character-syntax">'z'</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">c</span><span class="plain-syntax"> - </span><span class="constant-syntax">32</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">c</span><span class="plain-syntax"> < </span><span class="constant-syntax">155</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</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">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">c</span><span class="plain-syntax"> <= </span><span class="constant-syntax">157</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">c</span><span class="plain-syntax"> + </span><span class="constant-syntax">3</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">c</span><span class="plain-syntax"> < </span><span class="constant-syntax">164</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</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">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">c</span><span class="plain-syntax"> <= </span><span class="constant-syntax">165</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">c</span><span class="plain-syntax"> + </span><span class="constant-syntax">3</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">c</span><span class="plain-syntax"> < </span><span class="constant-syntax">169</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</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">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">c</span><span class="plain-syntax"> <= </span><span class="constant-syntax">174</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">c</span><span class="plain-syntax"> + </span><span class="constant-syntax">6</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">c</span><span class="plain-syntax"> < </span><span class="constant-syntax">181</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</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">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">c</span><span class="plain-syntax"> <= </span><span class="constant-syntax">185</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">c</span><span class="plain-syntax"> + </span><span class="constant-syntax">5</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">c</span><span class="plain-syntax"> < </span><span class="constant-syntax">191</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</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">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">c</span><span class="plain-syntax"> <= </span><span class="constant-syntax">195</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">c</span><span class="plain-syntax"> + </span><span class="constant-syntax">5</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">c</span><span class="plain-syntax"> == </span><span class="constant-syntax">201</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">c</span><span class="plain-syntax"> + </span><span class="constant-syntax">1</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">c</span><span class="plain-syntax"> == </span><span class="constant-syntax">203</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">c</span><span class="plain-syntax"> + </span><span class="constant-syntax">1</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">c</span><span class="plain-syntax"> < </span><span class="constant-syntax">205</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</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">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">c</span><span class="plain-syntax"> <= </span><span class="constant-syntax">207</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">c</span><span class="plain-syntax"> + </span><span class="constant-syntax">3</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">c</span><span class="plain-syntax"> == </span><span class="constant-syntax">211</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">c</span><span class="plain-syntax"> + </span><span class="constant-syntax">1</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">c</span><span class="plain-syntax"> == </span><span class="constant-syntax">213</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">c</span><span class="plain-syntax"> + </span><span class="constant-syntax">1</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">c</span><span class="plain-syntax"> == </span><span class="constant-syntax">215</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">c</span><span class="plain-syntax"> + </span><span class="constant-syntax">2</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">c</span><span class="plain-syntax"> == </span><span class="constant-syntax">216</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">c</span><span class="plain-syntax"> + </span><span class="constant-syntax">2</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">c</span><span class="plain-syntax"> == </span><span class="constant-syntax">220</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">c</span><span class="plain-syntax"> + </span><span class="constant-syntax">1</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">c</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" class="paragraph-anchor"></a><b>§5. </b>It's convenient to provide this relatively fast routine to reverse the
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case of a letter, since this is an operation used frequently in regular
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expression matching.
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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="identifier-syntax">TEXT_TY_RevCase</span><span class="plain-syntax"> </span><span class="identifier-syntax">ch</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">ch</span><span class="plain-syntax"><</span><span class="character-syntax">'A'</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">ch</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">ch</span><span class="plain-syntax"> >= </span><span class="character-syntax">'a'</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">ch</span><span class="plain-syntax"> <= </span><span class="character-syntax">'z'</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">ch</span><span class="plain-syntax">-</span><span class="character-syntax">'a'</span><span class="plain-syntax">+</span><span class="character-syntax">'A'</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">ch</span><span class="plain-syntax"> >= </span><span class="character-syntax">'A'</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">ch</span><span class="plain-syntax"> <= </span><span class="character-syntax">'Z'</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">ch</span><span class="plain-syntax">-</span><span class="character-syntax">'A'</span><span class="plain-syntax">+</span><span class="character-syntax">'a'</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">ch</span><span class="plain-syntax"><128) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">ch</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">ch</span><span class="plain-syntax"> >= </span><span class="constant-syntax">155</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">ch</span><span class="plain-syntax"> <= </span><span class="constant-syntax">157</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">ch</span><span class="plain-syntax">+3; </span><span class="comment-syntax">a, o, u umlaut in ZSCII</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">ch</span><span class="plain-syntax"> >= </span><span class="constant-syntax">158</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">ch</span><span class="plain-syntax"> <= </span><span class="constant-syntax">160</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">ch</span><span class="plain-syntax">-3; </span><span class="comment-syntax">A, O, U umlaut</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">ch</span><span class="plain-syntax"> >= </span><span class="constant-syntax">164</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">ch</span><span class="plain-syntax"> <= </span><span class="constant-syntax">165</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">ch</span><span class="plain-syntax">+3; </span><span class="comment-syntax">e, i umlaut</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">ch</span><span class="plain-syntax"> >= </span><span class="constant-syntax">167</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">ch</span><span class="plain-syntax"> <= </span><span class="constant-syntax">168</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">ch</span><span class="plain-syntax">-3; </span><span class="comment-syntax">E, I umlaut</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">ch</span><span class="plain-syntax"> >= </span><span class="constant-syntax">169</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">ch</span><span class="plain-syntax"> <= </span><span class="constant-syntax">174</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">ch</span><span class="plain-syntax">+6; </span><span class="comment-syntax">a, e, i, o, u, y acute</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">ch</span><span class="plain-syntax"> >= </span><span class="constant-syntax">175</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">ch</span><span class="plain-syntax"> <= </span><span class="constant-syntax">180</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">ch</span><span class="plain-syntax">-6; </span><span class="comment-syntax">A, E, I, O, U, Y acute</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">ch</span><span class="plain-syntax"> >= </span><span class="constant-syntax">181</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">ch</span><span class="plain-syntax"> <= </span><span class="constant-syntax">185</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">ch</span><span class="plain-syntax">+5; </span><span class="comment-syntax">a, e, i, o, u grave</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">ch</span><span class="plain-syntax"> >= </span><span class="constant-syntax">186</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">ch</span><span class="plain-syntax"> <= </span><span class="constant-syntax">190</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">ch</span><span class="plain-syntax">-5; </span><span class="comment-syntax">A, E, I, O, U grave</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">ch</span><span class="plain-syntax"> >= </span><span class="constant-syntax">191</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">ch</span><span class="plain-syntax"> <= </span><span class="constant-syntax">195</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">ch</span><span class="plain-syntax">+5; </span><span class="comment-syntax">a, e, i, o, u circumflex</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">ch</span><span class="plain-syntax"> >= </span><span class="constant-syntax">196</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">ch</span><span class="plain-syntax"> <= </span><span class="constant-syntax">200</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">ch</span><span class="plain-syntax">-5; </span><span class="comment-syntax">A, E, I, O, U circumflex</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">ch</span><span class="plain-syntax"> == </span><span class="constant-syntax">201</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">202</span><span class="plain-syntax">; </span><span class="comment-syntax">a circle</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">ch</span><span class="plain-syntax"> == </span><span class="constant-syntax">202</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">201</span><span class="plain-syntax">; </span><span class="comment-syntax">A circle</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">ch</span><span class="plain-syntax"> == </span><span class="constant-syntax">203</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">204</span><span class="plain-syntax">; </span><span class="comment-syntax">o slash</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">ch</span><span class="plain-syntax"> == </span><span class="constant-syntax">204</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">203</span><span class="plain-syntax">; </span><span class="comment-syntax">O slash</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">ch</span><span class="plain-syntax"> >= </span><span class="constant-syntax">205</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">ch</span><span class="plain-syntax"> <= </span><span class="constant-syntax">207</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">ch</span><span class="plain-syntax">+3; </span><span class="comment-syntax">a, n, o tilde</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">ch</span><span class="plain-syntax"> >= </span><span class="constant-syntax">208</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">ch</span><span class="plain-syntax"> <= </span><span class="constant-syntax">210</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">ch</span><span class="plain-syntax">-3; </span><span class="comment-syntax">A, N, O tilde</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">ch</span><span class="plain-syntax"> == </span><span class="constant-syntax">211</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">212</span><span class="plain-syntax">; </span><span class="comment-syntax">ae ligature</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">ch</span><span class="plain-syntax"> == </span><span class="constant-syntax">212</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">211</span><span class="plain-syntax">; </span><span class="comment-syntax">AE ligature</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">ch</span><span class="plain-syntax"> == </span><span class="constant-syntax">213</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">214</span><span class="plain-syntax">; </span><span class="comment-syntax">c cedilla</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">ch</span><span class="plain-syntax"> == </span><span class="constant-syntax">214</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">213</span><span class="plain-syntax">; </span><span class="comment-syntax">C cedilla</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">ch</span><span class="plain-syntax"> == </span><span class="constant-syntax">215</span><span class="plain-syntax"> </span><span class="reserved-syntax">or</span><span class="plain-syntax"> </span><span class="constant-syntax">216</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">ch</span><span class="plain-syntax">+2; </span><span class="comment-syntax">thorn, eth</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">ch</span><span class="plain-syntax"> == </span><span class="constant-syntax">217</span><span class="plain-syntax"> </span><span class="reserved-syntax">or</span><span class="plain-syntax"> </span><span class="constant-syntax">218</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">ch</span><span class="plain-syntax">-2; </span><span class="comment-syntax">Thorn, Eth</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">ch</span><span class="plain-syntax"> == </span><span class="constant-syntax">220</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">221</span><span class="plain-syntax">; </span><span class="comment-syntax">oe ligature</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">ch</span><span class="plain-syntax"> == </span><span class="constant-syntax">221</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">220</span><span class="plain-syntax">; </span><span class="comment-syntax">OE ligature</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">ch</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">];</span>
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</pre>
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