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<p class="purpose">To parse representations of periods of time or of historical repetition.</p>
<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>&#167;1. </b>Natural language can talk about the extension of a situation into the past
in a number of ways, but we will model just two of these:
</p>
<ul class="items"><li>(a) Something having been the case on a number of previous occasions, or
"times", as in: "for the third time";
</li><li>(b) Something having been the case on a number of previous turns, a unit
really only meaningful for turn-based simulations, as in: "for three turns".
</li></ul>
<pre class="definitions code-font"><span class="definition-keyword">define</span> <span class="constant-syntax">TIMES_UNIT</span><span class="plain-syntax"> </span><span class="constant-syntax">1</span><span class="plain-syntax"> </span><span class="comment-syntax"> used for "for the third time"</span>
<span class="definition-keyword">define</span> <span class="constant-syntax">TURNS_UNIT</span><span class="plain-syntax"> </span><span class="constant-syntax">2</span><span class="plain-syntax"> </span><span class="comment-syntax"> used for "for three turns"</span>
</pre>
<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>&#167;2. </b>And the following the constants are used to record how to measure the
threshold value &mdash; "for more than three turns" would be <span class="extract"><span class="extract-syntax">GT_REPM</span></span>, and so
on. The default, <span class="extract"><span class="extract-syntax">NO_REPM</span></span>, means that nothing is specified by way of
comparison &mdash; "four times" &mdash; and the meaning of that may depend on
context; Inform treats a <span class="extract"><span class="extract-syntax">NO_REPM</span></span> occurrence quite carefully &mdash; see
<a href="../runtime-module/5-chr.html" class="internal">Chronology (in runtime)</a>.
</p>
<pre class="definitions code-font"><span class="definition-keyword">enum</span> <span class="constant-syntax">EQ_REPM</span><span class="plain-syntax"> </span><span class="identifier-syntax">from</span><span class="plain-syntax"> </span><span class="constant-syntax">1</span>
<span class="definition-keyword">enum</span> <span class="constant-syntax">LT_REPM</span>
<span class="definition-keyword">enum</span> <span class="constant-syntax">LE_REPM</span>
<span class="definition-keyword">enum</span> <span class="constant-syntax">GT_REPM</span>
<span class="definition-keyword">enum</span> <span class="constant-syntax">GE_REPM</span>
<span class="definition-keyword">enum</span> <span class="constant-syntax">NO_REPM</span>
</pre>
<p class="commentary firstcommentary"><a id="SP3" class="paragraph-anchor"></a><b>&#167;3. </b>The following structure is used for the result of parsing some text for
a time period. For example, "X is 7 for the second time" would have as
its used wording "for the second time", and unused wording "X is 7".
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">typedef</span><span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">time_period</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">units</span><span class="plain-syntax">; </span><span class="comment-syntax"> one of the two above</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">length</span><span class="plain-syntax">; </span><span class="comment-syntax"> the duration or else the lower limit of an interval</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">until</span><span class="plain-syntax">; </span><span class="comment-syntax"> </span><span class="extract"><span class="extract-syntax">-1</span></span><span class="comment-syntax"> or else the upper limit of an interval</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">test_operator</span><span class="plain-syntax">; </span><span class="comment-syntax"> one of the </span><span class="extract"><span class="extract-syntax">*_REPM</span></span><span class="comment-syntax"> constants</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">wording</span><span class="plain-syntax"> </span><span class="identifier-syntax">used_wording</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">wording</span><span class="plain-syntax"> </span><span class="identifier-syntax">unused_wording</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">CLASS_DEFINITION</span>
<span class="plain-syntax">} </span><span class="reserved-syntax">time_period</span><span class="plain-syntax">;</span>
</pre>
<ul class="endnotetexts"><li>The structure time_period is private to this section.</li></ul>
<p class="commentary firstcommentary"><a id="SP4" class="paragraph-anchor"></a><b>&#167;4. </b>Logging:
</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">Occurrence::log</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">Occurrence::log</span></span>:<br/>Linguistics Module - <a href="1-lm.html#SP3_2">&#167;3.2</a><br/>Diagrams - <a href="1-dgr.html#SP3">&#167;3</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">OUTPUT_STREAM</span><span class="plain-syntax">, </span><span class="reserved-syntax">void</span><span class="plain-syntax"> *</span><span class="identifier-syntax">vtp</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">time_period</span><span class="plain-syntax"> *</span><span class="identifier-syntax">tp</span><span class="plain-syntax"> = (</span><span class="reserved-syntax">time_period</span><span class="plain-syntax"> *) </span><span class="identifier-syntax">vtp</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">"&lt;"</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">tp</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">test_operator</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">EQ_REPM:</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>
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">LT_REPM:</span><span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"&lt;"</span><span class="plain-syntax">); </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">LE_REPM:</span><span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"&lt;="</span><span class="plain-syntax">); </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">GT_REPM:</span><span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"&gt;"</span><span class="plain-syntax">); </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">GE_REPM:</span><span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"&gt;="</span><span class="plain-syntax">); </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">tp</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">until</span><span class="plain-syntax"> &gt;= </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">"%d"</span><span class="plain-syntax">, </span><span class="identifier-syntax">tp</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">until</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">"%d"</span><span class="plain-syntax">, </span><span class="identifier-syntax">tp</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">length</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">tp</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">units</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">TURNS_UNIT:</span><span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">" turns"</span><span class="plain-syntax">); </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">TIMES_UNIT:</span><span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">" times"</span><span class="plain-syntax">); </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">default:</span><span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">": &lt;invalid-units&gt;"</span><span class="plain-syntax">); </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"&gt;"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP5" class="paragraph-anchor"></a><b>&#167;5. </b>Access:
</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">Occurrence::operator</span><span class="plain-syntax">(</span><span class="reserved-syntax">time_period</span><span class="plain-syntax"> *</span><span class="identifier-syntax">tp</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">tp</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">NO_REPM</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">tp</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">test_operator</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">Occurrence::units</span><span class="plain-syntax">(</span><span class="reserved-syntax">time_period</span><span class="plain-syntax"> *</span><span class="identifier-syntax">tp</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">tp</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">TIMES_UNIT</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">tp</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">units</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">Occurrence::length</span><span class="plain-syntax">(</span><span class="reserved-syntax">time_period</span><span class="plain-syntax"> *</span><span class="identifier-syntax">tp</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">tp</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> -1;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">tp</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">length</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">Occurrence::until</span><span class="plain-syntax">(</span><span class="reserved-syntax">time_period</span><span class="plain-syntax"> *</span><span class="identifier-syntax">tp</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">tp</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> -1;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">tp</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">until</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
<span class="identifier-syntax">wording</span><span class="plain-syntax"> </span><span class="function-syntax">Occurrence::used_wording</span><span class="plain-syntax">(</span><span class="reserved-syntax">time_period</span><span class="plain-syntax"> *</span><span class="identifier-syntax">tp</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">tp</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"no time period"</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">tp</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">used_wording</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
<span class="identifier-syntax">wording</span><span class="plain-syntax"> </span><span class="function-syntax">Occurrence::unused_wording</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">Occurrence::unused_wording</span></span>:<br/>Verb Phrases - <a href="4-vp.html#SP5_4_1_1_1_3_4">&#167;5.4.1.1.1.3.4</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">time_period</span><span class="plain-syntax"> *</span><span class="identifier-syntax">tp</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">tp</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"no time period"</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">tp</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">unused_wording</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP6" class="paragraph-anchor"></a><b>&#167;6. </b>Sorting.
Sorting of time periods has to be by "specificity". A briefer time period
is in this sense more specific than a longer one, because it is more specific
about the time at which the behaviour occurs.
</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">Occurrence::compare_specificity</span><span class="plain-syntax">(</span><span class="reserved-syntax">time_period</span><span class="plain-syntax"> *</span><span class="identifier-syntax">tp1</span><span class="plain-syntax">, </span><span class="reserved-syntax">time_period</span><span class="plain-syntax"> *</span><span class="identifier-syntax">tp2</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">tp1</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) &amp;&amp; (</span><span class="identifier-syntax">tp2</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</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">tp1</span><span class="plain-syntax">) &amp;&amp; (</span><span class="identifier-syntax">tp2</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</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">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">tp2</span><span class="plain-syntax">) &amp;&amp; (</span><span class="identifier-syntax">tp1</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> -1;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">dc1</span><span class="plain-syntax"> = </span><a href="3-apoo.html#SP6" class="function-link"><span class="function-syntax">Occurrence::sorting_count</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">tp1</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">dc2</span><span class="plain-syntax"> = </span><a href="3-apoo.html#SP6" class="function-link"><span class="function-syntax">Occurrence::sorting_count</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">tp2</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">dc1</span><span class="plain-syntax"> &gt; </span><span class="identifier-syntax">dc2</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> -1;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">dc1</span><span class="plain-syntax"> &lt; </span><span class="identifier-syntax">dc2</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</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">return</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">int</span><span class="plain-syntax"> </span><span class="function-syntax">Occurrence::sorting_count</span><span class="plain-syntax">(</span><span class="reserved-syntax">time_period</span><span class="plain-syntax"> *</span><span class="identifier-syntax">tp</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">L</span><span class="plain-syntax"> = </span><span class="identifier-syntax">tp</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">length</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">L</span><span class="plain-syntax"> &lt; </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="identifier-syntax">L</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">tp</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">until</span><span class="plain-syntax"> &gt;= </span><span class="constant-syntax">0</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">tp</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">until</span><span class="plain-syntax"> - </span><span class="identifier-syntax">L</span><span class="plain-syntax"> + </span><span class="constant-syntax">1</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">switch</span><span class="plain-syntax"> (</span><span class="identifier-syntax">tp</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">test_operator</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">NO_REPM:</span><span class="plain-syntax"> </span><span class="reserved-syntax">return</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">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">EQ_REPM:</span><span class="plain-syntax"> </span><span class="reserved-syntax">return</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">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">LT_REPM:</span><span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">L</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">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">LE_REPM:</span><span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">L</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">GT_REPM:</span><span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">1000000</span><span class="plain-syntax"> - (</span><span class="identifier-syntax">L</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">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">GE_REPM:</span><span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">1000000</span><span class="plain-syntax"> - </span><span class="identifier-syntax">L</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP7" class="paragraph-anchor"></a><b>&#167;7. </b>Historical references are textual indications that a condition compares
the present state with past states: for example, "for more than the third time".
Note that every HR contains one of the words below, so that if
&lt;historical-reference-possible&gt; fails on an excerpt then it
cannot contain any HR; this cuts down our parsing time considerably.
</p>
<pre class="Preform-displayed-code all-displayed-code code-font">
<span class="Preform-function-syntax">&lt;historical-reference-possible&gt;</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">::=</span>
<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">***</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">once/twice/thrice/turn/turns/time/times</span>
</pre>
<ul class="endnotetexts"><li>This is <a href="../words-module/4-ap.html" class="internal">Preform grammar</a>, not regular C code.</li></ul>
<p class="commentary firstcommentary"><a id="SP8" class="paragraph-anchor"></a><b>&#167;8. </b>Otherwise the grammar is straightforward:
</p>
<pre class="Preform-displayed-code all-displayed-code code-font">
<span class="Preform-function-syntax">&lt;historical-reference&gt;</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">::=</span>
<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">for</span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax">&lt;repetition-specification&gt;</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==&gt;</span><span class="Preform-plain-syntax"> { R[1], - }</span>
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax">&lt;repetition-specification&gt;</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==&gt;</span><span class="Preform-plain-syntax"> { R[1], - }</span>
<span class="Preform-function-syntax">&lt;repetition-specification&gt;</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">::=</span>
<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">only/exactly</span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax">&lt;repetitions&gt;</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==&gt;</span><span class="Preform-plain-syntax"> { EQ_REPM, - }</span>
<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">at</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">most</span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax">&lt;repetitions&gt;</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==&gt;</span><span class="Preform-plain-syntax"> { LE_REPM, - }</span>
<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">less/fewer</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">than</span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax">&lt;repetitions&gt;</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==&gt;</span><span class="Preform-plain-syntax"> { LT_REPM, - }</span>
<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">at</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">least</span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax">&lt;repetitions&gt;</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==&gt;</span><span class="Preform-plain-syntax"> { GE_REPM, - }</span>
<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">more</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">than</span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax">&lt;repetitions&gt;</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==&gt;</span><span class="Preform-plain-syntax"> { GT_REPM, - }</span>
<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">under</span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax">&lt;repetitions&gt;</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==&gt;</span><span class="Preform-plain-syntax"> { LT_REPM, - }</span>
<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">over</span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax">&lt;repetitions&gt;</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==&gt;</span><span class="Preform-plain-syntax"> { GT_REPM, - }</span>
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax">&lt;repetitions&gt;</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==&gt;</span><span class="Preform-plain-syntax"> { NO_REPM, - }</span>
<span class="Preform-function-syntax">&lt;repetitions&gt;</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">::=</span>
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax">&lt;iteration-repetitions&gt;</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==&gt;</span><span class="Preform-plain-syntax"> { 0, -, &lt;&lt;from&gt;&gt; = R[1], &lt;&lt;unit&gt;&gt; = TIMES_UNIT }</span>
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax">&lt;turn-repetitions&gt;</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==&gt;</span><span class="Preform-plain-syntax"> { 0, -, &lt;&lt;from&gt;&gt; = R[1], &lt;&lt;unit&gt;&gt; = TURNS_UNIT }</span>
<span class="Preform-function-syntax">&lt;iteration-repetitions&gt;</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">::=</span>
<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">once</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==&gt;</span><span class="Preform-plain-syntax"> { 1, - }</span>
<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">twice</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==&gt;</span><span class="Preform-plain-syntax"> { 2, - }</span>
<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">thrice</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==&gt;</span><span class="Preform-plain-syntax"> { 3, - }</span>
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax">&lt;reps&gt;</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">to</span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax">&lt;reps&gt;</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">time/times</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==&gt;</span><span class="Preform-plain-syntax"> { R[1], - , &lt;&lt;to&gt;&gt; = R[2] }</span>
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax">&lt;reps&gt;</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">time/times</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==&gt;</span><span class="Preform-plain-syntax"> { R[1], - }</span>
<span class="Preform-function-syntax">&lt;turn-repetitions&gt;</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">::=</span>
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax">&lt;reps&gt;</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">to</span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax">&lt;reps&gt;</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">turn/turns</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==&gt;</span><span class="Preform-plain-syntax"> { R[1], - , &lt;&lt;to&gt;&gt; = R[2] }</span>
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax">&lt;reps&gt;</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">turn/turns</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==&gt;</span><span class="Preform-plain-syntax"> { R[1], - }</span>
<span class="Preform-function-syntax">&lt;reps&gt;</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">::=</span>
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax">&lt;definite-article&gt;</span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax">&lt;ordinal-number&gt;</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==&gt;</span><span class="Preform-plain-syntax"> { R[2], - }</span>
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax">&lt;ordinal-number&gt;</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==&gt;</span><span class="Preform-plain-syntax"> { R[1], - }</span>
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax">&lt;cardinal-number&gt;</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==&gt;</span><span class="Preform-plain-syntax"> { R[1], - }</span>
</pre>
<ul class="endnotetexts"><li>This is <a href="../words-module/4-ap.html" class="internal">Preform grammar</a>, not regular C code.</li></ul>
<p class="commentary firstcommentary"><a id="SP9" class="paragraph-anchor"></a><b>&#167;9. </b>And so, finally, here is code to parse using the above grammar:
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">time_period</span><span class="plain-syntax"> *</span><span class="function-syntax">Occurrence::parse</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">Occurrence::parse</span></span>:<br/>Verb Phrases - <a href="4-vp.html#SP5_4_1_1_1_3_4">&#167;5.4.1.1.1.3.4</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">wording</span><span class="plain-syntax"> </span><span class="identifier-syntax">W</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="function-syntax">&lt;historical-reference-possible&gt;</span><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">)) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_THROUGH_WORDING</span><span class="plain-syntax">(</span><span class="identifier-syntax">k</span><span class="plain-syntax">, </span><span class="identifier-syntax">W</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="function-syntax">&lt;&lt;to&gt;&gt;</span><span class="plain-syntax"> = -1;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">wording</span><span class="plain-syntax"> </span><span class="identifier-syntax">HW</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Wordings::from</span><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">, </span><span class="identifier-syntax">k</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="function-syntax">&lt;historical-reference&gt;</span><span class="plain-syntax">(</span><span class="identifier-syntax">HW</span><span class="plain-syntax">)) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">time_period</span><span class="plain-syntax"> *</span><span class="identifier-syntax">tp</span><span class="plain-syntax"> = </span><span class="identifier-syntax">CREATE</span><span class="plain-syntax">(</span><span class="reserved-syntax">time_period</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">tp</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">test_operator</span><span class="plain-syntax"> = </span><span class="function-syntax">&lt;&lt;r&gt;&gt;</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">tp</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">length</span><span class="plain-syntax"> = </span><span class="function-syntax">&lt;&lt;from&gt;&gt;</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">tp</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">until</span><span class="plain-syntax"> = </span><span class="function-syntax">&lt;&lt;to&gt;&gt;</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">tp</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">units</span><span class="plain-syntax"> = </span><span class="function-syntax">&lt;&lt;unit&gt;&gt;</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">tp</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">used_wording</span><span class="plain-syntax"> = </span><span class="identifier-syntax">HW</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">tp</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">unused_wording</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Wordings::up_to</span><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">, </span><span class="identifier-syntax">k</span><span class="plain-syntax">-1);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">LOGIF</span><span class="plain-syntax">(</span><span class="identifier-syntax">TIME_PERIODS</span><span class="plain-syntax">, </span><span class="string-syntax">"Parsed time period: &lt;%W&gt; = $t\n"</span><span class="plain-syntax">, </span><span class="identifier-syntax">HW</span><span class="plain-syntax">, </span><span class="identifier-syntax">tp</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">tp</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
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