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<!--Weave of 'Phrase Runtime Context Data' 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">imperative</a></li><li><a href="index.html#3">Chapter 3: Phrases</a></li><li><b>Phrase Runtime Context Data</b></li></ul></div>
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<p class="purpose">To store the circumstances in which a rule phrase should fire.</p>
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<ul class="toc"><li><a href="3-prcd.html#SP3">§3. Access</a></li><li><a href="3-prcd.html#SP7">§7. Specificity of phrase runtime contexts</a></li><li><a href="3-prcd.html#SP8">§8. Activity list on demand</a></li></ul><hr class="tocbar">
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. </b>Runtime context data is the context in which a phrase is allowed to run,
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though it's only used for rules. For example,
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</p>
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<blockquote>
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<p>Before taking a container when the player is in the Box Room: ...</p>
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</blockquote>
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<p class="commentary">has the opportunity to fire when the "Before taking" rulebook gets to it.
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But the rule only actually does so if the action is "taking a container"
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and the condition about the location applies, and these two stipulations
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form the PHRCD for the rule. For some simpler rules, like:
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</p>
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<blockquote>
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<p>When play begins: ...</p>
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</blockquote>
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<p class="commentary">the PHRCD remains empty, because they are guaranteed to fire whenever their
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rulebooks reach them.
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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">id_runtime_context_data</span><span class="plain-syntax"> {</span>
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<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">activity_context</span><span class="plain-syntax">; </span><span class="comment-syntax"> happens only while any activities go on?</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">activity_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">avl</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> #</span><span class="identifier-syntax">ifdef</span><span class="plain-syntax"> </span><span class="identifier-syntax">IF_MODULE</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">during_scene</span><span class="plain-syntax">; </span><span class="comment-syntax"> ...happens only during a scene matching this?</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">action_pattern</span><span class="plain-syntax"> *</span><span class="identifier-syntax">ap</span><span class="plain-syntax">; </span><span class="comment-syntax"> happens only if the action matches this pattern?</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">always_test_actor</span><span class="plain-syntax">; </span><span class="comment-syntax"> ...even if no AP was given, test that actor is player?</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">never_test_actor</span><span class="plain-syntax">; </span><span class="comment-syntax"> ...for instance, for a parametrised rather than action rulebook</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">marked_for_anyone</span><span class="plain-syntax">; </span><span class="comment-syntax"> any actor is allowed to perform this action</span>
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<span class="plain-syntax"> #</span><span class="identifier-syntax">endif</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">permit_all_outcomes</span><span class="plain-syntax">; </span><span class="comment-syntax"> waive the usual restrictions on rule outcomes</span>
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<span class="plain-syntax">} </span><span class="reserved-syntax">id_runtime_context_data</span><span class="plain-syntax">;</span>
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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">rule_context</span><span class="plain-syntax"> {</span>
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<span class="plain-syntax"> #</span><span class="identifier-syntax">ifdef</span><span class="plain-syntax"> </span><span class="identifier-syntax">IF_MODULE</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">action_name</span><span class="plain-syntax"> *</span><span class="identifier-syntax">action_context</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">scene</span><span class="plain-syntax"> *</span><span class="identifier-syntax">scene_context</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> #</span><span class="identifier-syntax">endif</span>
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<span class="plain-syntax"> #</span><span class="identifier-syntax">ifndef</span><span class="plain-syntax"> </span><span class="identifier-syntax">IF_MODULE</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">void</span><span class="plain-syntax"> *</span><span class="identifier-syntax">not_used</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> #</span><span class="identifier-syntax">endif</span>
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<span class="plain-syntax">} </span><span class="reserved-syntax">rule_context</span><span class="plain-syntax">;</span>
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<span class="reserved-syntax">rule_context</span><span class="plain-syntax"> </span><span class="function-syntax">Phrases::Context::no_rule_context</span><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="reserved-syntax">rule_context</span><span class="plain-syntax"> </span><span class="identifier-syntax">rc</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> #</span><span class="identifier-syntax">ifdef</span><span class="plain-syntax"> </span><span class="identifier-syntax">IF_MODULE</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">rc</span><span class="plain-syntax">.</span><span class="element-syntax">action_context</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="identifier-syntax">rc</span><span class="plain-syntax">.</span><span class="element-syntax">scene_context</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="identifier-syntax">endif</span>
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<span class="plain-syntax"> #</span><span class="identifier-syntax">ifndef</span><span class="plain-syntax"> </span><span class="identifier-syntax">IF_MODULE</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">rc</span><span class="plain-syntax">.</span><span class="element-syntax">not_used</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="identifier-syntax">endif</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">rc</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">Phrases::Context::phrase_fits_rule_context</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">Phrases::Context::phrase_fits_rule_context</span></span>:<br/>Booking Lists - <a href="2-bl.html#SP7">§7</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">id_body</span><span class="plain-syntax"> *</span><span class="identifier-syntax">idb</span><span class="plain-syntax">, </span><span class="reserved-syntax">rule_context</span><span class="plain-syntax"> </span><span class="identifier-syntax">rc</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> #</span><span class="identifier-syntax">ifdef</span><span class="plain-syntax"> </span><span class="identifier-syntax">IF_MODULE</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">rc</span><span class="plain-syntax">.</span><span class="identifier-syntax">scene_context</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">TRUE</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">idb</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">FALSE</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><a href="3-prcd.html#SP5" class="function-link"><span class="function-syntax">Phrases::Context::get_scene</span></a><span class="plain-syntax">(&(</span><span class="identifier-syntax">idb</span><span class="plain-syntax">-></span><span class="identifier-syntax">runtime_context_data</span><span class="plain-syntax">)) != </span><span class="identifier-syntax">rc</span><span class="plain-syntax">.</span><span class="element-syntax">scene_context</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><span class="identifier-syntax">endif</span>
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<span class="plain-syntax"> #</span><span class="identifier-syntax">ifndef</span><span class="plain-syntax"> </span><span class="identifier-syntax">IF_MODULE</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><span class="identifier-syntax">endif</span>
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<span class="plain-syntax">}</span>
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<span class="plain-syntax">#</span><span class="identifier-syntax">ifdef</span><span class="plain-syntax"> </span><span class="identifier-syntax">IF_MODULE</span>
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<span class="reserved-syntax">rule_context</span><span class="plain-syntax"> </span><span class="function-syntax">Phrases::Context::action_context</span><span class="plain-syntax">(</span><span class="identifier-syntax">action_name</span><span class="plain-syntax"> *</span><span class="identifier-syntax">an</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">rule_context</span><span class="plain-syntax"> </span><span class="identifier-syntax">rc</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">rc</span><span class="plain-syntax">.</span><span class="element-syntax">action_context</span><span class="plain-syntax"> = </span><span class="identifier-syntax">an</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">rc</span><span class="plain-syntax">.</span><span class="element-syntax">scene_context</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">rc</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">rule_context</span><span class="plain-syntax"> </span><span class="function-syntax">Phrases::Context::scene_context</span><span class="plain-syntax">(</span><span class="identifier-syntax">scene</span><span class="plain-syntax"> *</span><span class="identifier-syntax">s</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">rule_context</span><span class="plain-syntax"> </span><span class="identifier-syntax">rc</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">rc</span><span class="plain-syntax">.</span><span class="element-syntax">action_context</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="identifier-syntax">rc</span><span class="plain-syntax">.</span><span class="element-syntax">scene_context</span><span class="plain-syntax"> = </span><span class="identifier-syntax">s</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">rc</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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<span class="plain-syntax">#</span><span class="identifier-syntax">endif</span>
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</pre>
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<ul class="endnotetexts"><li>The structure id_runtime_context_data is private to this section.</li><li>The structure rule_context 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>As we've seen, PHRCDs are really made by translating them from PHUDs, and
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the following only blanks out a PHRCD structure ready for that to happen.
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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">id_runtime_context_data</span><span class="plain-syntax"> </span><span class="function-syntax">Phrases::Context::new</span><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="reserved-syntax">id_runtime_context_data</span><span class="plain-syntax"> </span><span class="identifier-syntax">phrcd</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">phrcd</span><span class="plain-syntax">.</span><span class="identifier-syntax">activity_context</span><span class="plain-syntax"> = </span><span class="identifier-syntax">EMPTY_WORDING</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">phrcd</span><span class="plain-syntax">.</span><span class="identifier-syntax">avl</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="identifier-syntax">ifdef</span><span class="plain-syntax"> </span><span class="identifier-syntax">IF_MODULE</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">phrcd</span><span class="plain-syntax">.</span><span class="identifier-syntax">during_scene</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="identifier-syntax">phrcd</span><span class="plain-syntax">.</span><span class="identifier-syntax">ap</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="identifier-syntax">phrcd</span><span class="plain-syntax">.</span><span class="identifier-syntax">always_test_actor</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="identifier-syntax">phrcd</span><span class="plain-syntax">.</span><span class="identifier-syntax">never_test_actor</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="identifier-syntax">phrcd</span><span class="plain-syntax">.</span><span class="identifier-syntax">marked_for_anyone</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="identifier-syntax">endif</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">phrcd</span><span class="plain-syntax">.</span><span class="identifier-syntax">permit_all_outcomes</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">phrcd</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. Access. </b>Some access routines: first, for actor testing.
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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">Phrases::Context::set_always_test_actor</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">Phrases::Context::set_always_test_actor</span></span>:<br/>Rules - <a href="2-rls.html#SP18">§18</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">id_runtime_context_data</span><span class="plain-syntax"> *</span><span class="identifier-syntax">phrcd</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> #</span><span class="identifier-syntax">ifdef</span><span class="plain-syntax"> </span><span class="identifier-syntax">IF_MODULE</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">phrcd</span><span class="plain-syntax">-></span><span class="identifier-syntax">always_test_actor</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">endif</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Phrases::Context::clear_always_test_actor</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">Phrases::Context::clear_always_test_actor</span></span>:<br/>Rules - <a href="2-rls.html#SP18">§18</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">id_runtime_context_data</span><span class="plain-syntax"> *</span><span class="identifier-syntax">phrcd</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> #</span><span class="identifier-syntax">ifdef</span><span class="plain-syntax"> </span><span class="identifier-syntax">IF_MODULE</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">phrcd</span><span class="plain-syntax">-></span><span class="identifier-syntax">always_test_actor</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> #</span><span class="identifier-syntax">endif</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Phrases::Context::set_never_test_actor</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">Phrases::Context::set_never_test_actor</span></span>:<br/>Rules - <a href="2-rls.html#SP18">§18</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">id_runtime_context_data</span><span class="plain-syntax"> *</span><span class="identifier-syntax">phrcd</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> #</span><span class="identifier-syntax">ifdef</span><span class="plain-syntax"> </span><span class="identifier-syntax">IF_MODULE</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">phrcd</span><span class="plain-syntax">-></span><span class="identifier-syntax">never_test_actor</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">endif</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Phrases::Context::set_marked_for_anyone</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">Phrases::Context::set_marked_for_anyone</span></span>:<br/>Rules - <a href="2-rls.html#SP18">§18</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">id_runtime_context_data</span><span class="plain-syntax"> *</span><span class="identifier-syntax">phrcd</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">to</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> #</span><span class="identifier-syntax">ifdef</span><span class="plain-syntax"> </span><span class="identifier-syntax">IF_MODULE</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">phrcd</span><span class="plain-syntax">-></span><span class="identifier-syntax">marked_for_anyone</span><span class="plain-syntax"> = </span><span class="identifier-syntax">to</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> #</span><span class="identifier-syntax">endif</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">Phrases::Context::get_marked_for_anyone</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">Phrases::Context::get_marked_for_anyone</span></span>:<br/>Rules - <a href="2-rls.html#SP18">§18</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">id_runtime_context_data</span><span class="plain-syntax"> *</span><span class="identifier-syntax">phrcd</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> #</span><span class="identifier-syntax">ifdef</span><span class="plain-syntax"> </span><span class="identifier-syntax">IF_MODULE</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">phrcd</span><span class="plain-syntax">-></span><span class="element-syntax">marked_for_anyone</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> #</span><span class="identifier-syntax">endif</span>
|
|
<span class="plain-syntax"> #</span><span class="identifier-syntax">ifndef</span><span class="plain-syntax"> </span><span class="identifier-syntax">IF_MODULE</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><span class="identifier-syntax">endif</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP4" class="paragraph-anchor"></a><b>§4. </b>The required (or not) action:
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax">#</span><span class="identifier-syntax">ifdef</span><span class="plain-syntax"> </span><span class="identifier-syntax">IF_MODULE</span>
|
|
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">Phrases::Context::within_action_context</span><span class="plain-syntax">(</span><span class="reserved-syntax">id_runtime_context_data</span><span class="plain-syntax"> *</span><span class="identifier-syntax">phrcd</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">action_name</span><span class="plain-syntax"> *</span><span class="identifier-syntax">an</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">phrcd</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">FALSE</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">ActionPatterns::covers_action</span><span class="plain-syntax">(</span><span class="identifier-syntax">phrcd</span><span class="plain-syntax">-></span><span class="element-syntax">ap</span><span class="plain-syntax">, </span><span class="identifier-syntax">an</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax">}</span>
|
|
<span class="plain-syntax">#</span><span class="identifier-syntax">endif</span>
|
|
|
|
<span class="plain-syntax">#</span><span class="identifier-syntax">ifdef</span><span class="plain-syntax"> </span><span class="identifier-syntax">IF_MODULE</span>
|
|
<span class="identifier-syntax">action_name</span><span class="plain-syntax"> *</span><span class="function-syntax">Phrases::Context::required_action</span><span class="plain-syntax">(</span><span class="reserved-syntax">id_runtime_context_data</span><span class="plain-syntax"> *</span><span class="identifier-syntax">phrcd</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">phrcd</span><span class="plain-syntax">-></span><span class="element-syntax">ap</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">ActionPatterns::single_positive_action</span><span class="plain-syntax">(</span><span class="identifier-syntax">phrcd</span><span class="plain-syntax">-></span><span class="element-syntax">ap</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>
|
|
<span class="plain-syntax">#</span><span class="identifier-syntax">endif</span>
|
|
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Phrases::Context::suppress_action_testing</span><button class="popup" onclick="togglePopup('usagePopup7')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup7">Usage of <span class="code-font"><span class="function-syntax">Phrases::Context::suppress_action_testing</span></span>:<br/>Rules - <a href="2-rls.html#SP18">§18</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">id_runtime_context_data</span><span class="plain-syntax"> *</span><span class="identifier-syntax">phrcd</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> #</span><span class="identifier-syntax">ifdef</span><span class="plain-syntax"> </span><span class="identifier-syntax">IF_MODULE</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">phrcd</span><span class="plain-syntax">-></span><span class="element-syntax">ap</span><span class="plain-syntax">) </span><span class="identifier-syntax">ActionPatterns::suppress_action_testing</span><span class="plain-syntax">(</span><span class="identifier-syntax">phrcd</span><span class="plain-syntax">-></span><span class="element-syntax">ap</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> #</span><span class="identifier-syntax">endif</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP5" class="paragraph-anchor"></a><b>§5. </b>The reason we store a whole specification, rather than a scene constant,
|
|
here is that we sometimes want rules which happen during "a recurring scene",
|
|
or some other description of scenes in general. The following routine
|
|
extracts a single specified scene if there is one:
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax">#</span><span class="identifier-syntax">ifdef</span><span class="plain-syntax"> </span><span class="identifier-syntax">IF_MODULE</span>
|
|
<span class="identifier-syntax">scene</span><span class="plain-syntax"> *</span><span class="function-syntax">Phrases::Context::get_scene</span><button class="popup" onclick="togglePopup('usagePopup8')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup8">Usage of <span class="code-font"><span class="function-syntax">Phrases::Context::get_scene</span></span>:<br/><a href="3-prcd.html#SP1">§1</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">id_runtime_context_data</span><span class="plain-syntax"> *</span><span class="identifier-syntax">phrcd</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">phrcd</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>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Rvalues::is_rvalue</span><span class="plain-syntax">(</span><span class="identifier-syntax">phrcd</span><span class="plain-syntax">-></span><span class="element-syntax">during_scene</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">q</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Rvalues::to_instance</span><span class="plain-syntax">(</span><span class="identifier-syntax">phrcd</span><span class="plain-syntax">-></span><span class="element-syntax">during_scene</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">q</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">Scenes::from_named_constant</span><span class="plain-syntax">(</span><span class="identifier-syntax">q</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>
|
|
<span class="plain-syntax">#</span><span class="identifier-syntax">endif</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP6" class="paragraph-anchor"></a><b>§6. </b>This is to do with named outcomes of rules, whereby certain outcomes are
|
|
normally limited to the use of rules in particular rulebooks.
|
|
</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">Phrases::Context::outcome_restrictions_waived</span><button class="popup" onclick="togglePopup('usagePopup9')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup9">Usage of <span class="code-font"><span class="function-syntax">Phrases::Context::outcome_restrictions_waived</span></span>:<br/>Compile Phrases - <a href="6-cp.html#SP4_3_3">§4.3.3</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">void</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">id_body_being_compiled</span><span class="plain-syntax">) &&</span>
|
|
<span class="plain-syntax"> (</span><span class="identifier-syntax">id_body_being_compiled</span><span class="plain-syntax">-></span><span class="identifier-syntax">runtime_context_data</span><span class="plain-syntax">.</span><span class="element-syntax">permit_all_outcomes</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">TRUE</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="SP7" class="paragraph-anchor"></a><b>§7. Specificity of phrase runtime contexts. </b>The following is one of Inform's standardised comparison routines, which
|
|
takes a pair of objects A, B and returns 1 if A makes a more specific
|
|
description than B, 0 if they seem equally specific, or \(-1\) if B makes a
|
|
more specific description than A. This is transitive, and intended to be
|
|
used in sorting algorithms.
|
|
</p>
|
|
|
|
<p class="commentary">In this case, laws I to V are applied in turn until one is decisive. If
|
|
all of them fail to decide, we return 0.
|
|
</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">Phrases::Context::compare_specificity</span><button class="popup" onclick="togglePopup('usagePopup10')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup10">Usage of <span class="code-font"><span class="function-syntax">Phrases::Context::compare_specificity</span></span>:<br/>Rules - <a href="2-rls.html#SP14">§14</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">id_runtime_context_data</span><span class="plain-syntax"> *</span><span class="identifier-syntax">rcd1</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">id_runtime_context_data</span><span class="plain-syntax"> *</span><span class="identifier-syntax">rcd2</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> #</span><span class="identifier-syntax">ifdef</span><span class="plain-syntax"> </span><span class="identifier-syntax">IF_MODULE</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">action_pattern</span><span class="plain-syntax"> *</span><span class="identifier-syntax">ap1</span><span class="plain-syntax">, *</span><span class="identifier-syntax">ap2</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">sc1</span><span class="plain-syntax">, *</span><span class="identifier-syntax">sc2</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> #</span><span class="identifier-syntax">endif</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">wording</span><span class="plain-syntax"> </span><span class="identifier-syntax">AL1W</span><span class="plain-syntax">, </span><span class="identifier-syntax">AL2W</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="3-prcd.html#SP7_1" class="named-paragraph-link"><span class="named-paragraph">Extract these from the PHRCDs under comparison</span><span class="named-paragraph-number">7.1</span></a></span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="3-prcd.html#SP7_2" class="named-paragraph-link"><span class="named-paragraph">Apply comparison law I</span><span class="named-paragraph-number">7.2</span></a></span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="3-prcd.html#SP7_3" class="named-paragraph-link"><span class="named-paragraph">Apply comparison law II</span><span class="named-paragraph-number">7.3</span></a></span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="3-prcd.html#SP7_4" class="named-paragraph-link"><span class="named-paragraph">Apply comparison law III</span><span class="named-paragraph-number">7.4</span></a></span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="3-prcd.html#SP7_5" class="named-paragraph-link"><span class="named-paragraph">Apply comparison law IV</span><span class="named-paragraph-number">7.5</span></a></span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="3-prcd.html#SP7_6" class="named-paragraph-link"><span class="named-paragraph">Apply comparison law V</span><span class="named-paragraph-number">7.6</span></a></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_1" class="paragraph-anchor"></a><b>§7.1. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Extract these from the PHRCDs under comparison</span><span class="named-paragraph-number">7.1</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">rcd1</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> #</span><span class="identifier-syntax">ifdef</span><span class="plain-syntax"> </span><span class="identifier-syntax">IF_MODULE</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">sc1</span><span class="plain-syntax"> = </span><span class="identifier-syntax">rcd1</span><span class="plain-syntax">-></span><span class="element-syntax">during_scene</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">ap1</span><span class="plain-syntax"> = </span><span class="identifier-syntax">rcd1</span><span class="plain-syntax">-></span><span class="element-syntax">ap</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> #</span><span class="identifier-syntax">endif</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">AL1W</span><span class="plain-syntax"> = </span><span class="identifier-syntax">rcd1</span><span class="plain-syntax">-></span><span class="element-syntax">activity_context</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="identifier-syntax">ifdef</span><span class="plain-syntax"> </span><span class="identifier-syntax">IF_MODULE</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">sc1</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">ap1</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> #</span><span class="identifier-syntax">endif</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">AL1W</span><span class="plain-syntax"> = </span><span class="identifier-syntax">EMPTY_WORDING</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">rcd2</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> #</span><span class="identifier-syntax">ifdef</span><span class="plain-syntax"> </span><span class="identifier-syntax">IF_MODULE</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">sc2</span><span class="plain-syntax"> = </span><span class="identifier-syntax">rcd2</span><span class="plain-syntax">-></span><span class="element-syntax">during_scene</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">ap2</span><span class="plain-syntax"> = </span><span class="identifier-syntax">rcd2</span><span class="plain-syntax">-></span><span class="element-syntax">ap</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> #</span><span class="identifier-syntax">endif</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">AL2W</span><span class="plain-syntax"> = </span><span class="identifier-syntax">rcd2</span><span class="plain-syntax">-></span><span class="element-syntax">activity_context</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="identifier-syntax">ifdef</span><span class="plain-syntax"> </span><span class="identifier-syntax">IF_MODULE</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">sc2</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">ap2</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> #</span><span class="identifier-syntax">endif</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">AL2W</span><span class="plain-syntax"> = </span><span class="identifier-syntax">EMPTY_WORDING</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="3-prcd.html#SP7">§7</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP7_2" class="paragraph-anchor"></a><b>§7.2. </b>More constraints beats fewer.
|
|
</p>
|
|
|
|
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Apply comparison law I</span><span class="named-paragraph-number">7.2</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">c_s_stage_law</span><span class="plain-syntax"> = </span><span class="identifier-syntax">I</span><span class="string-syntax">"I - Number of aspects constrained"</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">rct1</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">, </span><span class="identifier-syntax">rct2</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> #</span><span class="identifier-syntax">ifdef</span><span class="plain-syntax"> </span><span class="identifier-syntax">IF_MODULE</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">rct1</span><span class="plain-syntax"> = </span><span class="identifier-syntax">APClauses::count_aspects</span><span class="plain-syntax">(</span><span class="identifier-syntax">ap1</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">rct2</span><span class="plain-syntax"> = </span><span class="identifier-syntax">APClauses::count_aspects</span><span class="plain-syntax">(</span><span class="identifier-syntax">ap2</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">sc1</span><span class="plain-syntax">) </span><span class="identifier-syntax">rct1</span><span class="plain-syntax">++; </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">sc2</span><span class="plain-syntax">) </span><span class="identifier-syntax">rct2</span><span class="plain-syntax">++;</span>
|
|
<span class="plain-syntax"> #</span><span class="identifier-syntax">endif</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Wordings::nonempty</span><span class="plain-syntax">(</span><span class="identifier-syntax">AL1W</span><span class="plain-syntax">)) </span><span class="identifier-syntax">rct1</span><span class="plain-syntax">++; </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Wordings::nonempty</span><span class="plain-syntax">(</span><span class="identifier-syntax">AL2W</span><span class="plain-syntax">)) </span><span class="identifier-syntax">rct2</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">rct1</span><span class="plain-syntax"> > </span><span class="identifier-syntax">rct2</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">rct1</span><span class="plain-syntax"> < </span><span class="identifier-syntax">rct2</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> -1;</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="3-prcd.html#SP7">§7</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP7_3" class="paragraph-anchor"></a><b>§7.3. </b>If both have scene requirements, a narrow requirement beats a broad one.
|
|
</p>
|
|
|
|
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Apply comparison law II</span><span class="named-paragraph-number">7.3</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">ifdef</span><span class="plain-syntax"> </span><span class="identifier-syntax">IF_MODULE</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">sc1</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">sc2</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">rv</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Specifications::compare_specificity</span><span class="plain-syntax">(</span><span class="identifier-syntax">sc1</span><span class="plain-syntax">, </span><span class="identifier-syntax">sc2</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</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">rv</span><span class="plain-syntax"> != </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">rv</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> #</span><span class="identifier-syntax">endif</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="3-prcd.html#SP7">§7</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP7_4" class="paragraph-anchor"></a><b>§7.4. </b>More when/while conditions beats fewer.
|
|
</p>
|
|
|
|
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Apply comparison law III</span><span class="named-paragraph-number">7.4</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">c_s_stage_law</span><span class="plain-syntax"> = </span><span class="identifier-syntax">I</span><span class="string-syntax">"III - When/while requirement"</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">Wordings::nonempty</span><span class="plain-syntax">(</span><span class="identifier-syntax">AL1W</span><span class="plain-syntax">)) && (</span><span class="identifier-syntax">Wordings::empty</span><span class="plain-syntax">(</span><span class="identifier-syntax">AL2W</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">Wordings::empty</span><span class="plain-syntax">(</span><span class="identifier-syntax">AL1W</span><span class="plain-syntax">)) && (</span><span class="identifier-syntax">Wordings::nonempty</span><span class="plain-syntax">(</span><span class="identifier-syntax">AL2W</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">Wordings::nonempty</span><span class="plain-syntax">(</span><span class="identifier-syntax">AL1W</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">n1</span><span class="plain-syntax"> = </span><a href="3-prcd.html#SP9" class="function-link"><span class="function-syntax">Phrases::Context::count_avl</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">rcd1</span><span class="plain-syntax">-></span><span class="element-syntax">avl</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">n2</span><span class="plain-syntax"> = </span><a href="3-prcd.html#SP9" class="function-link"><span class="function-syntax">Phrases::Context::count_avl</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">rcd2</span><span class="plain-syntax">-></span><span class="element-syntax">avl</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">n1</span><span class="plain-syntax"> > </span><span class="identifier-syntax">n2</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">n2</span><span class="plain-syntax"> > </span><span class="identifier-syntax">n1</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> -1;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="3-prcd.html#SP7">§7</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP7_5" class="paragraph-anchor"></a><b>§7.5. </b>A more specific action (or parameter) beats a less specific one.
|
|
</p>
|
|
|
|
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Apply comparison law IV</span><span class="named-paragraph-number">7.5</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">c_s_stage_law</span><span class="plain-syntax"> = </span><span class="identifier-syntax">I</span><span class="string-syntax">"IV - Action requirement"</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> #</span><span class="identifier-syntax">ifdef</span><span class="plain-syntax"> </span><span class="identifier-syntax">IF_MODULE</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">rv</span><span class="plain-syntax"> = </span><span class="identifier-syntax">ActionPatterns::compare_specificity</span><span class="plain-syntax">(</span><span class="identifier-syntax">ap1</span><span class="plain-syntax">, </span><span class="identifier-syntax">ap2</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">rv</span><span class="plain-syntax"> != </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">rv</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> #</span><span class="identifier-syntax">endif</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="3-prcd.html#SP7">§7</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP7_6" class="paragraph-anchor"></a><b>§7.6. </b>A rule with a scene requirement beats one without.
|
|
</p>
|
|
|
|
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Apply comparison law V</span><span class="named-paragraph-number">7.6</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">c_s_stage_law</span><span class="plain-syntax"> = </span><span class="identifier-syntax">I</span><span class="string-syntax">"V - Scene requirement"</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> #</span><span class="identifier-syntax">ifdef</span><span class="plain-syntax"> </span><span class="identifier-syntax">IF_MODULE</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">sc1</span><span class="plain-syntax"> != </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">sc2</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">sc1</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">sc2</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="identifier-syntax">endif</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="3-prcd.html#SP7">§7</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP8" class="paragraph-anchor"></a><b>§8. Activity list on demand. </b>There's a tricky race condition here: the activity list has to be parsed
|
|
with the correct rulebook variables or it won't parse; but the rulebook
|
|
variables won't be known until the rule is booked; and in order to book
|
|
the rule, Inform needs to sort it into logical sequence with others
|
|
already in the same rulebook; and that requires knowledge of the
|
|
conditions of usage; which in turn requires the activity list. So the
|
|
following function is called at the last possible moment in the booking
|
|
process.
|
|
</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">Phrases::Context::ensure_avl</span><button class="popup" onclick="togglePopup('usagePopup11')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup11">Usage of <span class="code-font"><span class="function-syntax">Phrases::Context::ensure_avl</span></span>:<br/>Rulebooks - <a href="2-rlb.html#SP12">§12</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">rule</span><span class="plain-syntax"> *</span><span class="identifier-syntax">R</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">imperative_defn</span><span class="plain-syntax"> *</span><span class="identifier-syntax">id</span><span class="plain-syntax"> = </span><a href="2-rls.html#SP9" class="function-link"><span class="function-syntax">Rules::get_imperative_definition</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">R</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">id</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">id_body</span><span class="plain-syntax"> *</span><span class="identifier-syntax">idb</span><span class="plain-syntax"> = </span><span class="identifier-syntax">id</span><span class="plain-syntax">-></span><span class="identifier-syntax">body_of_defn</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">id_runtime_context_data</span><span class="plain-syntax"> *</span><span class="identifier-syntax">rcd</span><span class="plain-syntax"> = &(</span><span class="identifier-syntax">idb</span><span class="plain-syntax">-></span><span class="identifier-syntax">runtime_context_data</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">Wordings::nonempty</span><span class="plain-syntax">(</span><span class="identifier-syntax">rcd</span><span class="plain-syntax">-></span><span class="element-syntax">activity_context</span><span class="plain-syntax">)) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">save_cs</span><span class="plain-syntax"> = </span><span class="identifier-syntax">current_sentence</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">current_sentence</span><span class="plain-syntax"> = </span><span class="identifier-syntax">id</span><span class="plain-syntax">-></span><span class="identifier-syntax">at</span><span class="plain-syntax">;</span>
|
|
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">ph_stack_frame</span><span class="plain-syntax"> *</span><span class="identifier-syntax">phsf</span><span class="plain-syntax"> = &(</span><span class="identifier-syntax">idb</span><span class="plain-syntax">-></span><span class="element-syntax">compilation_data</span><span class="plain-syntax">.</span><span class="identifier-syntax">stack_frame</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="4-sf.html#SP7" class="function-link"><span class="function-syntax">Frames::make_current</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">phsf</span><span class="plain-syntax">);</span>
|
|
|
|
<span class="plain-syntax"> </span><a href="4-sf.html#SP10" class="function-link"><span class="function-syntax">Frames::set_stvol</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">phsf</span><span class="plain-syntax">, </span><span class="identifier-syntax">R</span><span class="plain-syntax">-></span><span class="element-syntax">variables_visible_in_definition</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">rcd</span><span class="plain-syntax">-></span><span class="element-syntax">avl</span><span class="plain-syntax"> = </span><a href="3-prcd.html#SP13" class="function-link"><span class="function-syntax">Phrases::Context::parse_avl</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">rcd</span><span class="plain-syntax">-></span><span class="element-syntax">activity_context</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">current_sentence</span><span class="plain-syntax"> = </span><span class="identifier-syntax">save_cs</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP9" class="paragraph-anchor"></a><b>§9. </b></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">activity_list</span><span class="plain-syntax"> {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">activity</span><span class="plain-syntax"> *</span><span class="reserved-syntax">activity</span><span class="plain-syntax">; </span><span class="comment-syntax"> what activity</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">acting_on</span><span class="plain-syntax">; </span><span class="comment-syntax"> the parameter</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">only_when</span><span class="plain-syntax">; </span><span class="comment-syntax"> condition for when this applies</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">ACL_parity</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"> if meant positively, </span><span class="extract"><span class="extract-syntax">-1</span></span><span class="comment-syntax"> if negatively</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">activity_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">next</span><span class="plain-syntax">; </span><span class="comment-syntax"> next in activity list</span>
|
|
<span class="plain-syntax">} </span><span class="reserved-syntax">activity_list</span><span class="plain-syntax">;</span>
|
|
|
|
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">Phrases::Context::count_avl</span><button class="popup" onclick="togglePopup('usagePopup12')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup12">Usage of <span class="code-font"><span class="function-syntax">Phrases::Context::count_avl</span></span>:<br/><a href="3-prcd.html#SP7_4">§7.4</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">activity_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">avl</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">n</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">while</span><span class="plain-syntax"> (</span><span class="identifier-syntax">avl</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">n</span><span class="plain-syntax"> += </span><span class="constant-syntax">10</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">avl</span><span class="plain-syntax">-></span><span class="element-syntax">only_when</span><span class="plain-syntax">) </span><span class="identifier-syntax">n</span><span class="plain-syntax"> += </span><span class="identifier-syntax">Conditions::count</span><span class="plain-syntax">(</span><span class="identifier-syntax">avl</span><span class="plain-syntax">-></span><span class="element-syntax">only_when</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">avl</span><span class="plain-syntax"> = </span><span class="identifier-syntax">avl</span><span class="plain-syntax">-></span><span class="element-syntax">next</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">n</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>The structure activity_list is accessed in 2/rlb, 2/act, 4/lv, 4/sv, 4/sf, 5/dtd, 5/cdp, 6/inv, 6/pi, 6/cii, 6/cp, 6/cste and here.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP10" class="paragraph-anchor"></a><b>§10. </b>Run-time contexts are seen in the "while" clauses at the end of rules.
|
|
For example:
|
|
</p>
|
|
|
|
<blockquote>
|
|
<p>Rule for printing the name of the lemon sherbet while listing contents: ...</p>
|
|
</blockquote>
|
|
|
|
<p class="commentary">Here "listing contents" is the context. These are like action patterns, but
|
|
much simpler to parse — an or-divided list of activities can be given, with or
|
|
without operands; "not" can be used to negate the list; and ordinary
|
|
conditions are also allowed, as here:
|
|
</p>
|
|
|
|
<blockquote>
|
|
<p>Rule for printing the name of the sack while the sack is not carried: ...</p>
|
|
</blockquote>
|
|
|
|
<p class="commentary">where "the sack is not carried" is also a <run-time-context> even though
|
|
it mentions no activities.
|
|
</p>
|
|
|
|
<pre class="Preform-displayed-code all-displayed-code code-font">
|
|
<span class="Preform-function-syntax"><run-time-context></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">::=</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">not</span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><activity-list-unnegated></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> { 0, RP[1] }; </span><span class="named-paragraph-container code-font"><a href="3-prcd.html#SP10_2" class="named-paragraph-link"><span class="named-paragraph">Flip the activity list parities</span><span class="named-paragraph-number">10.2</span></a></span><span class="Preform-constant-syntax">;</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><activity-list-unnegated></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> { 0, RP[1] }</span>
|
|
|
|
<span class="Preform-function-syntax"><activity-list-unnegated></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">::=</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">...</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> { lookahead }</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><activity-list-entry></span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><activity-tail></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="3-prcd.html#SP10_3" class="named-paragraph-link"><span class="named-paragraph">Join the activity lists</span><span class="named-paragraph-number">10.3</span></a></span><span class="Preform-constant-syntax">;</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><activity-list-entry></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> { 0, RP[1] }</span>
|
|
|
|
<span class="Preform-function-syntax"><activity-tail></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">_or</span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><run-time-context></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> { 0, RP[1] }</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">_,/or</span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><run-time-context></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> { 0, RP[1] }</span>
|
|
|
|
<span class="Preform-function-syntax"><activity-list-entry></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">::=</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><activity-name></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="3-prcd.html#SP10_4" class="named-paragraph-link"><span class="named-paragraph">Make one-entry AL without operand</span><span class="named-paragraph-number">10.4</span></a></span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><activity-name></span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">of/for</span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><activity-operand></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="3-prcd.html#SP10_5" class="named-paragraph-link"><span class="named-paragraph">Make one-entry AL with operand</span><span class="named-paragraph-number">10.5</span></a></span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><activity-name></span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><activity-operand></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="3-prcd.html#SP10_5" class="named-paragraph-link"><span class="named-paragraph">Make one-entry AL with operand</span><span class="named-paragraph-number">10.5</span></a></span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">^<if-parsing-al-conditions></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">...</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="3-prcd.html#SP10_6" class="named-paragraph-link"><span class="named-paragraph">Make one-entry AL with unparsed text</span><span class="named-paragraph-number">10.6</span></a></span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><if-parsing-al-conditions></span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-condition></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="3-prcd.html#SP10_7" class="named-paragraph-link"><span class="named-paragraph">Make one-entry AL with condition</span><span class="named-paragraph-number">10.7</span></a></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="SP10_1" class="paragraph-anchor"></a><b>§10.1. </b>The optional operand handles "something" itself in productions (a) and (b)
|
|
in order to prevent it from being read as a description at production (c). This
|
|
prevents "something" from being read as "some thing", that is, it prevents
|
|
Inform from thinking that the operand value must have kind "thing".
|
|
</p>
|
|
|
|
<p class="commentary">If we do reach (c), the expression is required to be a value, or description of
|
|
values, of the kind to which the activity applies.
|
|
</p>
|
|
|
|
<pre class="Preform-displayed-code all-displayed-code code-font">
|
|
<span class="Preform-function-syntax"><activity-operand></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">::=</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">something/anything</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> { FALSE, Specifications::new_UNKNOWN(W) }</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">something/anything</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">else</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> { FALSE, Specifications::new_UNKNOWN(W) }</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-type-expression-or-value></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> { TRUE, RP[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="SP10_2" class="paragraph-anchor"></a><b>§10.2. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Flip the activity list parities</span><span class="named-paragraph-number">10.2</span></span><span class="Preform-comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">activity_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">al</span><span class="plain-syntax"> = *</span><span class="identifier-syntax">XP</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">al</span><span class="plain-syntax">; </span><span class="identifier-syntax">al</span><span class="plain-syntax">=</span><span class="identifier-syntax">al</span><span class="plain-syntax">-></span><span class="element-syntax">next</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">al</span><span class="plain-syntax">-></span><span class="element-syntax">ACL_parity</span><span class="plain-syntax"> = (</span><span class="identifier-syntax">al</span><span class="plain-syntax">-></span><span class="element-syntax">ACL_parity</span><span class="plain-syntax">)?</span><span class="identifier-syntax">FALSE:TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="3-prcd.html#SP10">§10</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP10_3" class="paragraph-anchor"></a><b>§10.3. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Join the activity lists</span><span class="named-paragraph-number">10.3</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">activity_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">al1</span><span class="plain-syntax"> = </span><span class="identifier-syntax">RP</span><span class="plain-syntax">[1], *</span><span class="identifier-syntax">al2</span><span class="plain-syntax"> = </span><span class="identifier-syntax">RP</span><span class="plain-syntax">[2];</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">al1</span><span class="plain-syntax">-></span><span class="element-syntax">next</span><span class="plain-syntax"> = </span><span class="identifier-syntax">al2</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> ==> { -, </span><span class="identifier-syntax">al1</span><span class="plain-syntax"> };</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="3-prcd.html#SP10">§10</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP10_4" class="paragraph-anchor"></a><b>§10.4. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Make one-entry AL without operand</span><span class="named-paragraph-number">10.4</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">activity_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">al</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="3-prcd.html#SP10_4_1" class="named-paragraph-link"><span class="named-paragraph">Make one-entry AL</span><span class="named-paragraph-number">10.4.1</span></a></span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">al</span><span class="plain-syntax">-></span><span class="element-syntax">activity</span><span class="plain-syntax"> = </span><span class="identifier-syntax">RP</span><span class="plain-syntax">[1];</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="3-prcd.html#SP10">§10</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP10_5" class="paragraph-anchor"></a><b>§10.5. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Make one-entry AL with operand</span><span class="named-paragraph-number">10.5</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">activity</span><span class="plain-syntax"> *</span><span class="identifier-syntax">an</span><span class="plain-syntax"> = </span><span class="identifier-syntax">RP</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">an</span><span class="plain-syntax">-></span><span class="element-syntax">activity_on_what_kind</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">FALSE</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">R</span><span class="plain-syntax">[2]) && (</span><span class="identifier-syntax">Dash::validate_parameter</span><span class="plain-syntax">(</span><span class="identifier-syntax">RP</span><span class="plain-syntax">[2], </span><span class="identifier-syntax">an</span><span class="plain-syntax">-></span><span class="element-syntax">activity_on_what_kind</span><span class="plain-syntax">) == </span><span class="identifier-syntax">FALSE</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><span class="reserved-syntax">activity_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">al</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="3-prcd.html#SP10_4_1" class="named-paragraph-link"><span class="named-paragraph">Make one-entry AL</span><span class="named-paragraph-number">10.4.1</span></a></span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">al</span><span class="plain-syntax">-></span><span class="element-syntax">activity</span><span class="plain-syntax"> = </span><span class="identifier-syntax">an</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">al</span><span class="plain-syntax">-></span><span class="element-syntax">acting_on</span><span class="plain-syntax"> = </span><span class="identifier-syntax">RP</span><span class="plain-syntax">[2];</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="3-prcd.html#SP10">§10</a> (twice).</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP10_6" class="paragraph-anchor"></a><b>§10.6. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Make one-entry AL with unparsed text</span><span class="named-paragraph-number">10.6</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">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">cond</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Specifications::new_UNKNOWN</span><span class="plain-syntax">(</span><span class="identifier-syntax">EMPTY_WORDING</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">activity_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">al</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="3-prcd.html#SP10_4_1" class="named-paragraph-link"><span class="named-paragraph">Make one-entry AL</span><span class="named-paragraph-number">10.4.1</span></a></span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">al</span><span class="plain-syntax">-></span><span class="element-syntax">only_when</span><span class="plain-syntax"> = </span><span class="identifier-syntax">cond</span><span class="plain-syntax">;</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="3-prcd.html#SP10">§10</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP10_7" class="paragraph-anchor"></a><b>§10.7. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Make one-entry AL with condition</span><span class="named-paragraph-number">10.7</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">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">cond</span><span class="plain-syntax"> = </span><span class="identifier-syntax">RP</span><span class="plain-syntax">[2];</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Dash::validate_conditional_clause</span><span class="plain-syntax">(</span><span class="identifier-syntax">cond</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="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">activity_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">al</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="3-prcd.html#SP10_4_1" class="named-paragraph-link"><span class="named-paragraph">Make one-entry AL</span><span class="named-paragraph-number">10.4.1</span></a></span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">al</span><span class="plain-syntax">-></span><span class="element-syntax">only_when</span><span class="plain-syntax"> = </span><span class="identifier-syntax">cond</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="3-prcd.html#SP10">§10</a>.</li></ul>
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<p class="commentary firstcommentary"><a id="SP10_4_1" class="paragraph-anchor"></a><b>§10.4.1. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Make one-entry AL</span><span class="named-paragraph-number">10.4.1</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">al</span><span class="plain-syntax"> = </span><span class="identifier-syntax">CREATE</span><span class="plain-syntax">(</span><span class="reserved-syntax">activity_list</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">al</span><span class="plain-syntax">-></span><span class="element-syntax">acting_on</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="identifier-syntax">al</span><span class="plain-syntax">-></span><span class="element-syntax">only_when</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="identifier-syntax">al</span><span class="plain-syntax">-></span><span class="element-syntax">next</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="identifier-syntax">al</span><span class="plain-syntax">-></span><span class="element-syntax">ACL_parity</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><span class="identifier-syntax">al</span><span class="plain-syntax">-></span><span class="element-syntax">activity</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="identifier-syntax">al</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="3-prcd.html#SP10_4">§10.4</a>, <a href="3-prcd.html#SP10_5">§10.5</a>, <a href="3-prcd.html#SP10_6">§10.6</a>, <a href="3-prcd.html#SP10_7">§10.7</a>.</li></ul>
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<p class="commentary firstcommentary"><a id="SP11" class="paragraph-anchor"></a><b>§11. </b></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">parsing_al_conditions</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP12" class="paragraph-anchor"></a><b>§12. </b>It's convenient not to look too closely at the condition sometimes.
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</p>
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<pre class="Preform-displayed-code all-displayed-code code-font">
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<span class="Preform-function-syntax"><if-parsing-al-conditions></span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">internal</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">0</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">{</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">if</span><span class="Preform-plain-syntax"> (</span><span class="Preform-identifier-syntax">parsing_al_conditions</span><span class="Preform-plain-syntax">) </span><span class="Preform-reserved-syntax">return</span><span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">TRUE</span><span class="Preform-plain-syntax">;</span>
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<span class="Preform-plain-syntax"> ==> { </span><span class="Preform-identifier-syntax">fail</span><span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">nonterminal</span><span class="Preform-plain-syntax"> };</span>
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<span class="Preform-plain-syntax">}</span>
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</pre>
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<ul class="endnotetexts"><li>This is <a href="../words-module/4-ap.html" class="internal">Preform grammar</a>, not regular C code.</li></ul>
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<p class="commentary firstcommentary"><a id="SP13" class="paragraph-anchor"></a><b>§13. </b>All of which sets up the context for:
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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">activity_list</span><span class="plain-syntax"> *</span><span class="function-syntax">Phrases::Context::parse_avl</span><button class="popup" onclick="togglePopup('usagePopup13')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup13">Usage of <span class="code-font"><span class="function-syntax">Phrases::Context::parse_avl</span></span>:<br/><a href="3-prcd.html#SP8">§8</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>
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">save_pac</span><span class="plain-syntax"> = </span><span class="identifier-syntax">parsing_al_conditions</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">parsing_al_conditions</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><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">rv</span><span class="plain-syntax"> = </span><span class="function-syntax"><run-time-context></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><span class="identifier-syntax">parsing_al_conditions</span><span class="plain-syntax"> = </span><span class="identifier-syntax">save_pac</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">rv</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="function-syntax"><<rp>></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">NULL</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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</pre>
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