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<!--Weave of '2/tai' generated by 7-->
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<ul class="crumbs"><li><a href="../webs.html">★</a></li><li><a href="index.html">inflections</a></li><li><a href="index.html#2">Chapter 2: Machinery</a></li><li><b>Tries and Inflections</b></li></ul><p class="purpose">Using tries to inflect word endings.</p>
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<ul class="toc"><li><a href="#SP1">§1. Suffix inflections</a></li><li><a href="#SP2">§2. General tries</a></li></ul><hr class="tocbar">
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<p class="inwebparagraph"><a id="SP1"></a><b>§1. Suffix inflections. </b>The following inflects the ending of the supplied text. It does so by
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running the text through an avinue (a sequence of tries), whose result
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is an instruction on how to modify that text: for example, the result
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<code class="display"><span class="extract">"3ize"</span></code> tells us to strike out the last 3 characters and add "ize".
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The special character <code class="display"><span class="extract">+</span></code> means "duplicate the last character" and
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is useful for inflections which double consonants, such as "big" to
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"bigger", which can be done with the instruction <code class="display"><span class="extract">"0+er"</span></code>.
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</p>
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<p class="inwebparagraph">If there's no initial digit, the result replaces the original entirely;
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if the result is null, i.e., if the avinue finds nothing, the result is
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the same as the original.
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</p>
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<pre class="display">
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<span class="reserved">int</span><span class="plain"> </span><span class="functiontext">Inflections::suffix_inflection</span><span class="plain">(</span><span class="identifier">OUTPUT_STREAM</span><span class="plain">, </span><span class="identifier">match_avinue</span><span class="plain"> *</span><span class="identifier">T</span><span class="plain">, </span><span class="identifier">text_stream</span><span class="plain"> *</span><span class="identifier">from</span><span class="plain">) {</span>
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<span class="identifier">wchar_t</span><span class="plain"> *</span><span class="identifier">result</span><span class="plain"> = </span><span class="identifier">Tries::search_avinue</span><span class="plain">(</span><span class="identifier">T</span><span class="plain">, </span><span class="identifier">from</span><span class="plain">);</span>
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<span class="reserved">return</span><span class="plain"> </span><span class="functiontext">Inflections::follow_suffix_instruction</span><span class="plain">(</span><span class="identifier">OUT</span><span class="plain">, </span><span class="identifier">from</span><span class="plain">, </span><span class="identifier">result</span><span class="plain">);</span>
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<span class="plain">}</span>
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<span class="reserved">int</span><span class="plain"> </span><span class="functiontext">Inflections::follow_suffix_instruction</span><span class="plain">(</span><span class="identifier">OUTPUT_STREAM</span><span class="plain">, </span><span class="identifier">text_stream</span><span class="plain"> *</span><span class="identifier">from</span><span class="plain">, </span><span class="identifier">wchar_t</span><span class="plain"> *</span><span class="identifier">instruction</span><span class="plain">) {</span>
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<span class="reserved">int</span><span class="plain"> </span><span class="identifier">success</span><span class="plain"> = </span><span class="identifier">TRUE</span><span class="plain">;</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">instruction</span><span class="plain"> == </span><span class="identifier">NULL</span><span class="plain">) { </span><span class="identifier">success</span><span class="plain"> = </span><span class="identifier">FALSE</span><span class="plain">; </span><span class="identifier">instruction</span><span class="plain"> = </span><span class="identifier">L</span><span class="string">"0"</span><span class="plain">; }</span>
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<span class="reserved">int</span><span class="plain"> </span><span class="identifier">back</span><span class="plain"> = </span><span class="identifier">instruction</span><span class="plain">[0] - </span><span class="character">'0'</span><span class="plain">;</span>
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<span class="identifier">TEMPORARY_TEXT</span><span class="plain">(</span><span class="identifier">outcome</span><span class="plain">);</span>
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<span class="reserved">if</span><span class="plain"> ((</span><span class="identifier">back</span><span class="plain"> < 0) || (</span><span class="identifier">back</span><span class="plain"> > 9)) {</span>
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<span class="identifier">WRITE_TO</span><span class="plain">(</span><span class="identifier">outcome</span><span class="plain">, </span><span class="string">"%w"</span><span class="plain">, </span><span class="identifier">instruction</span><span class="plain">);</span>
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<span class="plain">} </span><span class="reserved">else</span><span class="plain"> {</span>
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<span class="reserved">for</span><span class="plain"> (</span><span class="reserved">int</span><span class="plain"> </span><span class="identifier">i</span><span class="plain"> = 0, </span><span class="identifier">len</span><span class="plain"> = </span><span class="identifier">Str::len</span><span class="plain">(</span><span class="identifier">from</span><span class="plain">); </span><span class="identifier">i</span><span class="plain"><</span><span class="identifier">len</span><span class="plain">-</span><span class="identifier">back</span><span class="plain">; </span><span class="identifier">i</span><span class="plain">++) </span><span class="identifier">PUT_TO</span><span class="plain">(</span><span class="identifier">outcome</span><span class="plain">, </span><span class="identifier">Str::get_at</span><span class="plain">(</span><span class="identifier">from</span><span class="plain">, </span><span class="identifier">i</span><span class="plain">));</span>
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<span class="reserved">int</span><span class="plain"> </span><span class="identifier">j</span><span class="plain"> = 1;</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">instruction</span><span class="plain">[</span><span class="identifier">j</span><span class="plain">] == </span><span class="character">'+'</span><span class="plain">) { </span><span class="reserved">int</span><span class="plain"> </span><span class="identifier">last</span><span class="plain"> = </span><span class="identifier">Str::get_last_char</span><span class="plain">(</span><span class="identifier">outcome</span><span class="plain">); </span><span class="identifier">PUT_TO</span><span class="plain">(</span><span class="identifier">outcome</span><span class="plain">, </span><span class="identifier">last</span><span class="plain">); </span><span class="identifier">j</span><span class="plain">++; }</span>
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<span class="reserved">for</span><span class="plain"> (; </span><span class="identifier">instruction</span><span class="plain">[</span><span class="identifier">j</span><span class="plain">]; </span><span class="identifier">j</span><span class="plain">++) </span><span class="identifier">PUT_TO</span><span class="plain">(</span><span class="identifier">outcome</span><span class="plain">, </span><span class="identifier">instruction</span><span class="plain">[</span><span class="identifier">j</span><span class="plain">]);</span>
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<span class="plain">}</span>
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<span class="identifier">LOOP_THROUGH_TEXT</span><span class="plain">(</span><span class="identifier">pos</span><span class="plain">, </span><span class="identifier">outcome</span><span class="plain">)</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">Str::get</span><span class="plain">(</span><span class="identifier">pos</span><span class="plain">) == </span><span class="character">'+'</span><span class="plain">) </span><span class="identifier">PUT</span><span class="plain">(</span><span class="character">' '</span><span class="plain">);</span>
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<span class="reserved">else</span><span class="plain"> </span><span class="identifier">PUT</span><span class="plain">(</span><span class="identifier">Str::get</span><span class="plain">(</span><span class="identifier">pos</span><span class="plain">));</span>
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<span class="identifier">DISCARD_TEXT</span><span class="plain">(</span><span class="identifier">outcome</span><span class="plain">);</span>
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<span class="reserved">return</span><span class="plain"> </span><span class="identifier">success</span><span class="plain">;</span>
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<span class="plain">}</span>
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</pre>
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<p class="inwebparagraph"></p>
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<p class="endnote">The function Inflections::suffix_inflection is used in <a href="#SP2">§2</a>, 3/plr (<a href="3-plr.html#SP4">§4</a>), 3/ga (<a href="3-ga.html#SP2">§2</a>, <a href="3-ga.html#SP3">§3</a>), 3/pp (<a href="3-pp.html#SP2">§2</a>).</p>
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<p class="endnote">The function Inflections::follow_suffix_instruction is used in 3/dcl (<a href="3-dcl.html#SP3">§3</a>).</p>
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<p class="inwebparagraph"><a id="SP2"></a><b>§2. General tries. </b>Here we take a word assemblage and apply suffix inflection to the first word
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alone, preserving the rest. However, if the result of this inflection contains
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any <code class="display"><span class="extract">+</span></code> signs, those become word boundaries. This allows for inflections which
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do more than simply fiddle with the final letters.
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</p>
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<pre class="display">
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<span class="identifier">word_assemblage</span><span class="plain"> </span><span class="functiontext">Inflections::apply_trie_to_wa</span><span class="plain">(</span><span class="identifier">word_assemblage</span><span class="plain"> </span><span class="identifier">wa</span><span class="plain">, </span><span class="identifier">match_avinue</span><span class="plain"> *</span><span class="identifier">T</span><span class="plain">) {</span>
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<span class="identifier">vocabulary_entry</span><span class="plain"> **</span><span class="identifier">words</span><span class="plain">;</span>
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<span class="reserved">int</span><span class="plain"> </span><span class="identifier">no_words</span><span class="plain">;</span>
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<span class="identifier">WordAssemblages::as_array</span><span class="plain">(&</span><span class="identifier">wa</span><span class="plain">, &</span><span class="identifier">words</span><span class="plain">, &</span><span class="identifier">no_words</span><span class="plain">);</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">no_words</span><span class="plain"> == 0) </span><span class="reserved">return</span><span class="plain"> </span><span class="identifier">wa</span><span class="plain">;</span>
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<span class="identifier">TEMPORARY_TEXT</span><span class="plain">(</span><span class="identifier">unsuffixed</span><span class="plain">);</span>
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<span class="identifier">TEMPORARY_TEXT</span><span class="plain">(</span><span class="identifier">suffixed</span><span class="plain">);</span>
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<span class="identifier">WRITE_TO</span><span class="plain">(</span><span class="identifier">unsuffixed</span><span class="plain">, </span><span class="string">"%V"</span><span class="plain">, </span><span class="identifier">words</span><span class="plain">[0]);</span>
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<span class="reserved">int</span><span class="plain"> </span><span class="identifier">s</span><span class="plain"> = </span><span class="functiontext">Inflections::suffix_inflection</span><span class="plain">(</span><span class="identifier">suffixed</span><span class="plain">, </span><span class="identifier">T</span><span class="plain">, </span><span class="identifier">unsuffixed</span><span class="plain">);</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">s</span><span class="plain"> == </span><span class="identifier">FALSE</span><span class="plain">) {</span>
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<span class="identifier">LOOP_THROUGH_TEXT</span><span class="plain">(</span><span class="identifier">pos</span><span class="plain">, </span><span class="identifier">unsuffixed</span><span class="plain">)</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">Str::get</span><span class="plain">(</span><span class="identifier">pos</span><span class="plain">) == </span><span class="character">'+'</span><span class="plain">) </span><span class="identifier">PUT_TO</span><span class="plain">(</span><span class="identifier">suffixed</span><span class="plain">, </span><span class="character">' '</span><span class="plain">);</span>
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<span class="reserved">else</span><span class="plain"> </span><span class="identifier">PUT_TO</span><span class="plain">(</span><span class="identifier">suffixed</span><span class="plain">, </span><span class="identifier">Str::get</span><span class="plain">(</span><span class="identifier">pos</span><span class="plain">));</span>
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<span class="plain">}</span>
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<span class="identifier">wording</span><span class="plain"> </span><span class="identifier">W</span><span class="plain"> = </span><span class="identifier">Feeds::feed_stream</span><span class="plain">(</span><span class="identifier">suffixed</span><span class="plain">);</span>
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<span class="identifier">WordAssemblages::truncate</span><span class="plain">(&</span><span class="identifier">wa</span><span class="plain">, 1);</span>
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<span class="identifier">DISCARD_TEXT</span><span class="plain">(</span><span class="identifier">suffixed</span><span class="plain">);</span>
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<span class="identifier">DISCARD_TEXT</span><span class="plain">(</span><span class="identifier">unsuffixed</span><span class="plain">);</span>
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<span class="reserved">return</span><span class="plain"> </span><span class="identifier">WordAssemblages::join</span><span class="plain">(</span><span class="identifier">WordAssemblages::from_wording</span><span class="plain">(</span><span class="identifier">W</span><span class="plain">), </span><span class="identifier">wa</span><span class="plain">);</span>
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<span class="plain">}</span>
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</pre>
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<p class="inwebparagraph"></p>
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<p class="endnote">The function Inflections::apply_trie_to_wa is used in 2/nc (<a href="2-nc.html#SP4_1_1">§4.1.1</a>), 3/vc (<a href="3-vc.html#SP4_2_1">§4.2.1</a>).</p>
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<hr class="tocbar">
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<ul class="toc"><li><a href="2-np.html">Back to 'Non-Parsing Preform'</a></li><li><a href="2-nc.html">Continue with 'Name Clusters'</a></li></ul><hr class="tocbar">
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<!--End of weave-->
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