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<!--Weave of 'Property Values' generated by Inweb-->
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<div class="breadcrumbs">
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<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../compiler.html">Inform7</a></li><li><a href="index.html">runtime</a></li><li><a href="index.html#6">Chapter 6: Completion Resources</a></li><li><b>Property Values</b></li></ul></div>
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<p class="purpose">Compiling Inter property value instructions for the properties of instances and kinds.</p>
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<ul class="toc"><li><a href="6-pv.html#SP1">§1. Of instances and kinds</a></li><li><a href="6-pv.html#SP2">§2. Of subjects</a></li></ul><hr class="tocbar">
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. Of instances and kinds. </b>These are the only two functions to call from outside this section:
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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">RTPropertyValues::compile_values_for_instance</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">RTPropertyValues::compile_values_for_instance</span></span>:<br/>Instances - <a href="5-ins.html#SP4">§4</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">instance</span><span class="plain-syntax"> *</span><span class="identifier-syntax">I</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><a href="6-pv.html#SP2" class="function-link"><span class="function-syntax">RTPropertyValues::emit_subject</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">Instances::as_subject</span><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">));</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">RTPropertyValues::compile_values_for_kind</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">RTPropertyValues::compile_values_for_kind</span></span>:<br/>Kind Constructors - <a href="5-kc.html#SP10_7">§10.7</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">K</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><a href="6-pv.html#SP2" class="function-link"><span class="function-syntax">RTPropertyValues::emit_subject</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">KindSubjects::from_kind</span><span class="plain-syntax">(</span><span class="identifier-syntax">K</span><span class="plain-syntax">));</span>
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<span class="plain-syntax"> </span><a href="6-pv.html#SP4" class="function-link"><span class="function-syntax">RTPropertyValues::check_kind_can_have_property</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">K</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="SP2" class="paragraph-anchor"></a><b>§2. Of subjects. </b>So this is the common code to handle both:
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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">RTPropertyValues::emit_subject</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">RTPropertyValues::emit_subject</span></span>:<br/><a href="6-pv.html#SP1">§1</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">subj</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">LOGIF</span><span class="plain-syntax">(</span><span class="identifier-syntax">OBJECT_COMPILATION</span><span class="plain-syntax">, </span><span class="string-syntax">"Compiling properties for $j\n"</span><span class="plain-syntax">, </span><span class="identifier-syntax">subj</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">current_sentence</span><span class="plain-syntax"> = </span><span class="identifier-syntax">subj</span><span class="plain-syntax">-></span><span class="identifier-syntax">infs_created_at</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">packaging_state</span><span class="plain-syntax"> </span><span class="identifier-syntax">save</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Packaging::enter</span><span class="plain-syntax">(</span><a href="6-pp.html#SP1" class="function-link"><span class="function-syntax">RTPropertyPermissions::home</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">subj</span><span class="plain-syntax">));</span>
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<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="6-pv.html#SP2_1" class="named-paragraph-link"><span class="named-paragraph">Append any inclusions the source text requested</span><span class="named-paragraph-number">2.1</span></a></span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><a href="6-pv.html#SP3" class="function-link"><span class="function-syntax">RTPropertyValues::begin_traverse</span></a><span class="plain-syntax">();</span>
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<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="6-pv.html#SP2_2" class="named-paragraph-link"><span class="named-paragraph">Emit inferred object properties</span><span class="named-paragraph-number">2.2</span></a></span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="6-pv.html#SP2_3" class="named-paragraph-link"><span class="named-paragraph">Emit permitted but unspecified object properties</span><span class="named-paragraph-number">2.3</span></a></span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Packaging::exit</span><span class="plain-syntax">(</span><a href="2-emt.html#SP1" class="function-link"><span class="function-syntax">Emit::tree</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">save</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">LOGIF</span><span class="plain-syntax">(</span><span class="identifier-syntax">OBJECT_COMPILATION</span><span class="plain-syntax">, </span><span class="string-syntax">"Compilation of $j complete\n"</span><span class="plain-syntax">, </span><span class="identifier-syntax">subj</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="SP2_1" class="paragraph-anchor"></a><b>§2.1. </b>This is an ugly business, but the I7 language supports the injection of raw
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Inter code into object bodies. In an ideal world we would revoke this ability;
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the Standard Rules do not use it.
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</p>
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<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Append any inclusions the source text requested</span><span class="named-paragraph-number">2.1</span></span><span class="comment-syntax"> =</span>
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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">inter_name</span><span class="plain-syntax"> *</span><span class="identifier-syntax">iname</span><span class="plain-syntax"> = </span><a href="6-pp.html#SP1" class="function-link"><span class="function-syntax">RTPropertyPermissions::owner</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">subj</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">iname</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">"unsupported subject for emission"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="2-int.html#SP2" class="function-link"><span class="function-syntax">Interventions::make_for_subject</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">iname</span><span class="plain-syntax">, </span><span class="identifier-syntax">subj</span><span class="plain-syntax">);</span>
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</pre>
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<ul class="endnotetexts"><li>This code is used in <a href="6-pv.html#SP2">§2</a>.</li></ul>
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<p class="commentary firstcommentary"><a id="SP2_2" class="paragraph-anchor"></a><b>§2.2. </b>Now, here goes with the properties:
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</p>
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<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Emit inferred object properties</span><span class="named-paragraph-number">2.2</span></span><span class="comment-syntax"> =</span>
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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">inference</span><span class="plain-syntax"> *</span><span class="identifier-syntax">inf</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">KNOWLEDGE_LOOP</span><span class="plain-syntax">(</span><span class="identifier-syntax">inf</span><span class="plain-syntax">, </span><span class="identifier-syntax">subj</span><span class="plain-syntax">, </span><span class="identifier-syntax">property_inf</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">property</span><span class="plain-syntax"> *</span><span class="identifier-syntax">prn</span><span class="plain-syntax"> = </span><span class="identifier-syntax">PropertyInferences::get_property</span><span class="plain-syntax">(</span><span class="identifier-syntax">inf</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">current_sentence</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Inferences::where_inferred</span><span class="plain-syntax">(</span><span class="identifier-syntax">inf</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">LOGIF</span><span class="plain-syntax">(</span><span class="identifier-syntax">OBJECT_COMPILATION</span><span class="plain-syntax">, </span><span class="string-syntax">"Compiling property $Y\n"</span><span class="plain-syntax">, </span><span class="identifier-syntax">prn</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="6-pv.html#SP2_2_1" class="named-paragraph-link"><span class="named-paragraph">Emit the value of this property of the subject</span><span class="named-paragraph-number">2.2.1</span></a></span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> }</span>
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</pre>
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<ul class="endnotetexts"><li>This code is used in <a href="6-pv.html#SP2">§2</a>.</li></ul>
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<p class="commentary firstcommentary"><a id="SP2_3" class="paragraph-anchor"></a><b>§2.3. </b>We now wander through the permitted properties, even those which we have
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no actual knowledge about.
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</p>
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<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Emit permitted but unspecified object properties</span><span class="named-paragraph-number">2.3</span></span><span class="comment-syntax"> =</span>
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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="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="identifier-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">infs</span><span class="plain-syntax"> = </span><span class="identifier-syntax">subj</span><span class="plain-syntax">; </span><span class="identifier-syntax">infs</span><span class="plain-syntax">; </span><span class="identifier-syntax">infs</span><span class="plain-syntax"> =</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">InferenceSubjects::narrowest_broader_subject</span><span class="plain-syntax">(</span><span class="identifier-syntax">infs</span><span class="plain-syntax">)) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">property_permission</span><span class="plain-syntax"> *</span><span class="identifier-syntax">pp</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_OVER_PERMISSIONS_FOR_INFS</span><span class="plain-syntax">(</span><span class="identifier-syntax">pp</span><span class="plain-syntax">, </span><span class="identifier-syntax">infs</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">property</span><span class="plain-syntax"> *</span><span class="identifier-syntax">prn</span><span class="plain-syntax"> = </span><span class="identifier-syntax">PropertyPermissions::get_property</span><span class="plain-syntax">(</span><span class="identifier-syntax">pp</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">infs</span><span class="plain-syntax"> == </span><span class="identifier-syntax">subj</span><span class="plain-syntax">) ||</span>
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<span class="plain-syntax"> (</span><span class="identifier-syntax">Kinds::Behaviour::uses_block_values</span><span class="plain-syntax">(</span><span class="identifier-syntax">ValueProperties::kind</span><span class="plain-syntax">(</span><span class="identifier-syntax">prn</span><span class="plain-syntax">))))</span>
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<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="6-pv.html#SP2_2_1" class="named-paragraph-link"><span class="named-paragraph">Emit the value of this property of the subject</span><span class="named-paragraph-number">2.2.1</span></a></span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax"> }</span>
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</pre>
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<ul class="endnotetexts"><li>This code is used in <a href="6-pv.html#SP2">§2</a>.</li></ul>
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<p class="commentary firstcommentary"><a id="SP2_2_1" class="paragraph-anchor"></a><b>§2.2.1. </b>Either way, then, we end up here. The following works out what initial
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value the property will have, and compiles a clause as appropriate.
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</p>
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<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Emit the value of this property of the subject</span><span class="named-paragraph-number">2.2.1</span></span><span class="comment-syntax"> =</span>
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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="reserved-syntax">if</span><span class="plain-syntax"> ((</span><a href="6-pv.html#SP3" class="function-link"><span class="function-syntax">RTPropertyValues::visited_in_traverse</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">prn</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><a href="5-prp.html#SP3" class="function-link"><span class="function-syntax">RTProperties::can_be_compiled</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">prn</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">Properties::is_either_or</span><span class="plain-syntax">(</span><span class="identifier-syntax">prn</span><span class="plain-syntax">)) &&</span>
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<span class="plain-syntax"> (</span><a href="5-prp.html#SP4" class="function-link"><span class="function-syntax">RTProperties::stored_in_negation</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">prn</span><span class="plain-syntax">)))</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">prn</span><span class="plain-syntax"> = </span><span class="identifier-syntax">EitherOrProperties::get_negation</span><span class="plain-syntax">(</span><span class="identifier-syntax">prn</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">packaging_state</span><span class="plain-syntax"> </span><span class="identifier-syntax">save</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Packaging::enter</span><span class="plain-syntax">(</span><a href="6-pp.html#SP1" class="function-link"><span class="function-syntax">RTPropertyPermissions::home</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">subj</span><span class="plain-syntax">));</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">value_holster</span><span class="plain-syntax"> </span><span class="identifier-syntax">VH</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Holsters::new</span><span class="plain-syntax">(</span><span class="identifier-syntax">INTER_DATA_VHMODE</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Properties::compile_inferred_value</span><span class="plain-syntax">(&</span><span class="identifier-syntax">VH</span><span class="plain-syntax">, </span><span class="identifier-syntax">subj</span><span class="plain-syntax">, </span><span class="identifier-syntax">prn</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">inter_ti</span><span class="plain-syntax"> </span><span class="identifier-syntax">v1</span><span class="plain-syntax"> = </span><span class="identifier-syntax">LITERAL_IVAL</span><span class="plain-syntax">, </span><span class="identifier-syntax">v2</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Holsters::unholster_pair</span><span class="plain-syntax">(&</span><span class="identifier-syntax">VH</span><span class="plain-syntax">, &</span><span class="identifier-syntax">v1</span><span class="plain-syntax">, &</span><span class="identifier-syntax">v2</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="2-emt.html#SP18" class="function-link"><span class="function-syntax">Emit::propertyvalue</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">prn</span><span class="plain-syntax">, </span><a href="6-pp.html#SP1" class="function-link"><span class="function-syntax">RTPropertyPermissions::owner</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">subj</span><span class="plain-syntax">), </span><span class="identifier-syntax">v1</span><span class="plain-syntax">, </span><span class="identifier-syntax">v2</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Packaging::exit</span><span class="plain-syntax">(</span><a href="2-emt.html#SP1" class="function-link"><span class="function-syntax">Emit::tree</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">save</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> }</span>
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</pre>
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<ul class="endnotetexts"><li>This code is used in <a href="6-pv.html#SP2_2">§2.2</a>, <a href="6-pv.html#SP2_3">§2.3</a>.</li></ul>
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<p class="commentary firstcommentary"><a id="SP3" class="paragraph-anchor"></a><b>§3. </b>The following provides a mechanism to tell whether we have visited a property
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|
before. (Where visiting an either/or property also visits its negation.) This
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ensures that we cannot compile the same property of the same subject twice.
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">property_traverse_count</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
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|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">RTPropertyValues::begin_traverse</span><button class="popup" onclick="togglePopup('usagePopup4')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup4">Usage of <span class="code-font"><span class="function-syntax">RTPropertyValues::begin_traverse</span></span>:<br/><a href="6-pv.html#SP2">§2</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">void</span><span class="plain-syntax">) {</span>
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|
<span class="plain-syntax"> </span><span class="identifier-syntax">property_traverse_count</span><span class="plain-syntax">++;</span>
|
|
<span class="plain-syntax">}</span>
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|
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|
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">RTPropertyValues::visited_in_traverse</span><button class="popup" onclick="togglePopup('usagePopup5')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup5">Usage of <span class="code-font"><span class="function-syntax">RTPropertyValues::visited_in_traverse</span></span>:<br/><a href="6-pv.html#SP2_2_1">§2.2.1</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">property</span><span class="plain-syntax"> *</span><span class="identifier-syntax">prn</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">prn</span><span class="plain-syntax">-></span><span class="identifier-syntax">compilation_data</span><span class="plain-syntax">.</span><span class="element-syntax">visited_on_traverse</span><span class="plain-syntax"> == </span><span class="identifier-syntax">property_traverse_count</span><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>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">prn</span><span class="plain-syntax">-></span><span class="identifier-syntax">compilation_data</span><span class="plain-syntax">.</span><span class="element-syntax">visited_on_traverse</span><span class="plain-syntax"> = </span><span class="identifier-syntax">property_traverse_count</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">Properties::is_either_or</span><span class="plain-syntax">(</span><span class="identifier-syntax">prn</span><span class="plain-syntax">)) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">property</span><span class="plain-syntax"> *</span><span class="identifier-syntax">prnbar</span><span class="plain-syntax"> = </span><span class="identifier-syntax">EitherOrProperties::get_negation</span><span class="plain-syntax">(</span><span class="identifier-syntax">prn</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">prnbar</span><span class="plain-syntax">) </span><span class="identifier-syntax">prnbar</span><span class="plain-syntax">-></span><span class="identifier-syntax">compilation_data</span><span class="plain-syntax">.</span><span class="element-syntax">visited_on_traverse</span><span class="plain-syntax"> = </span><span class="identifier-syntax">property_traverse_count</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">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP4" class="paragraph-anchor"></a><b>§4. </b>This is a rather annoying provision, like everything to do with Inter
|
|
translation. But we don't want to hand the problem downstream to the code
|
|
generator; we want to deal with it now. The issue arises with source text like:
|
|
</p>
|
|
|
|
<blockquote>
|
|
<p>A keyword is a kind of value. The keywords are xyzzy, plugh. A keyword can be mentioned.</p>
|
|
</blockquote>
|
|
|
|
<p class="commentary">where "mentioned" is implemented for objects as an attribute in Inter.
|
|
</p>
|
|
|
|
<p class="commentary">That would make it impossible for the code-generator to store the property
|
|
instead in a flat array, which is how it will want to handle properties of
|
|
values. There are ways we could fix this, but property lookup needs to be fast,
|
|
and it seems best to reject the extra complexity needed.
|
|
</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">RTPropertyValues::check_kind_can_have_property</span><button class="popup" onclick="togglePopup('usagePopup6')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup6">Usage of <span class="code-font"><span class="function-syntax">RTPropertyValues::check_kind_can_have_property</span></span>:<br/><a href="6-pv.html#SP1">§1</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">kind</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="identifier-syntax">Kinds::Behaviour::is_object</span><span class="plain-syntax">(</span><span class="identifier-syntax">K</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</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">Kinds::Behaviour::definite</span><span class="plain-syntax">(</span><span class="identifier-syntax">K</span><span class="plain-syntax">) == </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">property</span><span class="plain-syntax"> *</span><span class="identifier-syntax">prn</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">property_permission</span><span class="plain-syntax"> *</span><span class="identifier-syntax">pp</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">instance</span><span class="plain-syntax"> *</span><span class="identifier-syntax">I_of</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">infs</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_OVER_INSTANCES</span><span class="plain-syntax">(</span><span class="identifier-syntax">I_of</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">for</span><span class="plain-syntax"> (</span><span class="identifier-syntax">infs</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Instances::as_subject</span><span class="plain-syntax">(</span><span class="identifier-syntax">I_of</span><span class="plain-syntax">); </span><span class="identifier-syntax">infs</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">infs</span><span class="plain-syntax"> = </span><span class="identifier-syntax">InferenceSubjects::narrowest_broader_subject</span><span class="plain-syntax">(</span><span class="identifier-syntax">infs</span><span class="plain-syntax">))</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_OVER_PERMISSIONS_FOR_INFS</span><span class="plain-syntax">(</span><span class="identifier-syntax">pp</span><span class="plain-syntax">, </span><span class="identifier-syntax">infs</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">prn</span><span class="plain-syntax"> = </span><span class="identifier-syntax">PropertyPermissions::get_property</span><span class="plain-syntax">(</span><span class="identifier-syntax">pp</span><span class="plain-syntax">))) &&</span>
|
|
<span class="plain-syntax"> (</span><a href="5-prp.html#SP3" class="function-link"><span class="function-syntax">RTProperties::can_be_compiled</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">prn</span><span class="plain-syntax">)) &&</span>
|
|
<span class="plain-syntax"> (</span><span class="identifier-syntax">problem_count</span><span class="plain-syntax"> == </span><span class="constant-syntax">0</span><span class="plain-syntax">) &&</span>
|
|
<span class="plain-syntax"> (</span><a href="5-prp.html#SP5" class="function-link"><span class="function-syntax">RTProperties::has_been_translated</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">prn</span><span class="plain-syntax">)) &&</span>
|
|
<span class="plain-syntax"> (</span><span class="identifier-syntax">Properties::is_either_or</span><span class="plain-syntax">(</span><span class="identifier-syntax">prn</span><span class="plain-syntax">)))</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="6-pv.html#SP4_1" class="named-paragraph-link"><span class="named-paragraph">Bitch about our implementation woes, like it's not our fault</span><span class="named-paragraph-number">4.1</span></a></span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP4_1" class="paragraph-anchor"></a><b>§4.1. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Bitch about our implementation woes, like it's not our fault</span><span class="named-paragraph-number">4.1</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">current_sentence</span><span class="plain-syntax"> = </span><span class="identifier-syntax">PropertyPermissions::where_granted</span><span class="plain-syntax">(</span><span class="identifier-syntax">pp</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_source</span><span class="plain-syntax">(1, </span><span class="identifier-syntax">current_sentence</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_property</span><span class="plain-syntax">(2, </span><span class="identifier-syntax">prn</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_kind</span><span class="plain-syntax">(3, </span><span class="identifier-syntax">K</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">StandardProblems::handmade_problem</span><span class="plain-syntax">(</span><span class="identifier-syntax">Task::syntax_tree</span><span class="plain-syntax">(), </span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_AnomalousProperty</span><span class="plain-syntax">));</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::issue_problem_segment</span><span class="plain-syntax">(</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"Sorry, but I'm going to have to disallow the sentence %1, even "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"though it asks for something reasonable. A very small number "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"of either-or properties with meanings special to Inform, like '%2', "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"are restricted so that only kinds of object can have them. Since "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"%3 isn't a kind of object, it can't be said to be %2. %P"</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"Probably you only need to call the property something else. The "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"built-in meaning would only make sense if it were a kind of object "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"in any case, so nothing is lost. Sorry for the inconvenience, all "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"the same; there are good implementation reasons."</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::issue_problem_end</span><span class="plain-syntax">();</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="6-pv.html#SP4">§4</a>.</li></ul>
|
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