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<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../compiler.html">Services</a></li><li><a href="index.html">calculus</a></li><li><a href="index.html#2">Chapter 2: Predicates</a></li><li><b>Unary Predicates</b></li></ul></div>
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<p class="purpose">A lightweight structure to record uses of an adjective, either positively or negatively.</p>
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. </b>We store this as a linguistic constant, which points to the adjective and
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also records its sense, i.e., positive or negative:
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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">typedef</span><span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">unary_predicate</span><span class="plain-syntax"> {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">lcon_ti</span><span class="plain-syntax"> </span><span class="identifier-syntax">lcon</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">} </span><span class="reserved-syntax">unary_predicate</span><span class="plain-syntax">;</span>
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</pre>
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<ul class="endnotetexts"><li>The structure unary_predicate is private to this section.</li></ul>
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<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>§2. </b></p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">unary_predicate</span><span class="plain-syntax"> *</span><span class="function-syntax">UnaryPredicates::new</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">UnaryPredicates::new</span></span>:<br/>Terms - <a href="3-trm.html#SP8">§8</a><br/>Atomic Propositions - <a href="3-ap.html#SP19">§19</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">adjective</span><span class="plain-syntax"> *</span><span class="identifier-syntax">aph</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">pos</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">unary_predicate</span><span class="plain-syntax"> *</span><span class="identifier-syntax">au</span><span class="plain-syntax"> = </span><span class="identifier-syntax">CREATE</span><span class="plain-syntax">(</span><span class="reserved-syntax">unary_predicate</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">au</span><span class="plain-syntax">-></span><span class="element-syntax">lcon</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Stock::to_lcon</span><span class="plain-syntax">(</span><span class="identifier-syntax">aph</span><span class="plain-syntax">-></span><span class="identifier-syntax">in_stock</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">pos</span><span class="plain-syntax">) </span><span class="identifier-syntax">au</span><span class="plain-syntax">-></span><span class="element-syntax">lcon</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Lcon::set_sense</span><span class="plain-syntax">(</span><span class="identifier-syntax">au</span><span class="plain-syntax">-></span><span class="element-syntax">lcon</span><span class="plain-syntax">, </span><span class="identifier-syntax">POSITIVE_SENSE</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="identifier-syntax">au</span><span class="plain-syntax">-></span><span class="element-syntax">lcon</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Lcon::set_sense</span><span class="plain-syntax">(</span><span class="identifier-syntax">au</span><span class="plain-syntax">-></span><span class="element-syntax">lcon</span><span class="plain-syntax">, </span><span class="identifier-syntax">NEGATIVE_SENSE</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">au</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">unary_predicate</span><span class="plain-syntax"> *</span><span class="function-syntax">UnaryPredicates::copy</span><span class="plain-syntax">(</span><span class="reserved-syntax">unary_predicate</span><span class="plain-syntax"> *</span><span class="identifier-syntax">au_from</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">unary_predicate</span><span class="plain-syntax"> *</span><span class="identifier-syntax">au</span><span class="plain-syntax"> = </span><span class="identifier-syntax">CREATE</span><span class="plain-syntax">(</span><span class="reserved-syntax">unary_predicate</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">au</span><span class="plain-syntax">-></span><span class="element-syntax">lcon</span><span class="plain-syntax"> = </span><span class="identifier-syntax">au_from</span><span class="plain-syntax">-></span><span class="element-syntax">lcon</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">au</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP3" class="paragraph-anchor"></a><b>§3. </b>Logging:
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">UnaryPredicates::log</span><span class="plain-syntax">(</span><span class="reserved-syntax">unary_predicate</span><span class="plain-syntax"> *</span><span class="identifier-syntax">au</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">adjective</span><span class="plain-syntax"> *</span><span class="identifier-syntax">aph</span><span class="plain-syntax"> = </span><a href="2-up.html#SP4" class="function-link"><span class="function-syntax">UnaryPredicates::get_adj</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">au</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">Lcon::get_sense</span><span class="plain-syntax">(</span><span class="identifier-syntax">au</span><span class="plain-syntax">-></span><span class="element-syntax">lcon</span><span class="plain-syntax">) == </span><span class="identifier-syntax">NEGATIVE_SENSE</span><span class="plain-syntax">) </span><span class="identifier-syntax">LOG</span><span class="plain-syntax">(</span><span class="string-syntax">"~"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">wording</span><span class="plain-syntax"> </span><span class="identifier-syntax">W</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Adjectives::get_nominative_singular</span><span class="plain-syntax">(</span><span class="identifier-syntax">aph</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">LOG</span><span class="plain-syntax">(</span><span class="string-syntax">"<adj:%W>"</span><span class="plain-syntax">, </span><span class="identifier-syntax">W</span><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP4" class="paragraph-anchor"></a><b>§4. </b>Access:
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="identifier-syntax">adjective</span><span class="plain-syntax"> *</span><span class="function-syntax">UnaryPredicates::get_adj</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">UnaryPredicates::get_adj</span></span>:<br/><a href="2-up.html#SP3">§3</a><br/>Terms - <a href="3-trm.html#SP7">§7</a><br/>Atomic Propositions - <a href="3-ap.html#SP24_1">§24.1</a><br/>Binding and Substitution - <a href="3-bas.html#SP17">§17</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">unary_predicate</span><span class="plain-syntax"> *</span><span class="identifier-syntax">au</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">au</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="identifier-syntax">NULL</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">Adjectives::from_lcon</span><span class="plain-syntax">(</span><span class="identifier-syntax">au</span><span class="plain-syntax">-></span><span class="element-syntax">lcon</span><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">UnaryPredicates::get_parity</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">UnaryPredicates::get_parity</span></span>:<br/>Atomic Propositions - <a href="3-ap.html#SP24_1">§24.1</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">unary_predicate</span><span class="plain-syntax"> *</span><span class="identifier-syntax">au</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">au</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">"null adjective tested for positivity"</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">Lcon::get_sense</span><span class="plain-syntax">(</span><span class="identifier-syntax">au</span><span class="plain-syntax">-></span><span class="element-syntax">lcon</span><span class="plain-syntax">) == </span><span class="identifier-syntax">NEGATIVE_SENSE</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP5" class="paragraph-anchor"></a><b>§5. </b>And this is the only non-trivial thing one can do with an adjective use:
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reverse its sense.
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">UnaryPredicates::flip_parity</span><span class="plain-syntax">(</span><span class="reserved-syntax">unary_predicate</span><span class="plain-syntax"> *</span><span class="identifier-syntax">au</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">au</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">"null adjective flipped"</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">Lcon::get_sense</span><span class="plain-syntax">(</span><span class="identifier-syntax">au</span><span class="plain-syntax">-></span><span class="element-syntax">lcon</span><span class="plain-syntax">) == </span><span class="identifier-syntax">NEGATIVE_SENSE</span><span class="plain-syntax">)</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">au</span><span class="plain-syntax">-></span><span class="element-syntax">lcon</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Lcon::set_sense</span><span class="plain-syntax">(</span><span class="identifier-syntax">au</span><span class="plain-syntax">-></span><span class="element-syntax">lcon</span><span class="plain-syntax">, </span><span class="identifier-syntax">POSITIVE_SENSE</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">else</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">au</span><span class="plain-syntax">-></span><span class="element-syntax">lcon</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Lcon::set_sense</span><span class="plain-syntax">(</span><span class="identifier-syntax">au</span><span class="plain-syntax">-></span><span class="element-syntax">lcon</span><span class="plain-syntax">, </span><span class="identifier-syntax">NEGATIVE_SENSE</span><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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