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<!--Weave of '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">assertions</a></li><li><a href="index.html#5">Chapter 5: Imperative Code</a></li><li><b>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="5-rcd.html#SP1">§1. Introduction</a></li><li><a href="5-rcd.html#SP3">§3. Specificity</a></li><li><a href="5-rcd.html#SP4">§4. Activity lists</a></li></ul><hr class="tocbar">
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. Introduction. </b>Runtime context data (RCD) is a set of restrictions on when a body of code can run.
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It's intended for rules, but in principle available for any imperative definition.
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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">can take effect only if the action is "taking a container" and the condition
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about the location applies. Those two restrictions are both stored in its RCD.
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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"> text used to parse...</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><span class="comment-syntax"> happens only while these 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="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 or parameter matches this</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">plugin_rcd</span><span class="plain-syntax">[</span><span class="identifier-syntax">MAX_PLUGINS</span><span class="plain-syntax">]; </span><span class="comment-syntax"> storage for plugins to attach, if they want to</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">id_runtime_context_data</span><span class="plain-syntax"> </span><span class="function-syntax">RuntimeContextData::new</span><button class="popup" onclick="togglePopup('usagePopup1')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup1">Usage of <span class="code-font"><span class="function-syntax">RuntimeContextData::new</span></span>:<br/>Imperative Definitions - <a href="5-id.html#SP7">§7</a><br/>Imperative Definition Families - <a href="5-idf.html#SP7">§7</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">void</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="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">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="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax">=0; </span><span class="identifier-syntax">i</span><span class="plain-syntax"><</span><span class="identifier-syntax">MAX_PLUGINS</span><span class="plain-syntax">; </span><span class="identifier-syntax">i</span><span class="plain-syntax">++) </span><span class="identifier-syntax">phrcd</span><span class="plain-syntax">.</span><span class="element-syntax">plugin_rcd</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</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">PluginCalls::new_rcd_notify</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="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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<span class="reserved-syntax">id_runtime_context_data</span><span class="plain-syntax"> *</span><span class="function-syntax">RuntimeContextData::of</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">RuntimeContextData::of</span></span>:<br/>Rules - <a href="6-rls.html#SP18">§18</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">imperative_defn</span><span class="plain-syntax"> *</span><span class="identifier-syntax">id</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">id</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> &(</span><span class="identifier-syntax">id</span><span class="plain-syntax">-></span><span class="element-syntax">body_of_defn</span><span class="plain-syntax">-></span><span class="element-syntax">runtime_context_data</span><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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</pre>
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<ul class="endnotetexts"><li>The structure id_runtime_context_data is accessed in 5/rf and here.</li></ul>
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<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>§2. </b>For the more interesting clauses, see <a href="../if-module/3-scn.html" class="internal">Scenes (in if)</a> and <a href="../if-module/4-rpoa.html" class="internal">Rules Predicated on Actions (in if)</a>,
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where the scenes and actions plugins make use of the following extensibility:
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</p>
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<pre class="definitions code-font"><span class="definition-keyword">define</span> <span class="identifier-syntax">RCD_PLUGIN_DATA</span><span class="plain-syntax">(</span><span class="identifier-syntax">id</span><span class="plain-syntax">, </span><span class="identifier-syntax">rcd</span><span class="plain-syntax">)</span>
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<span class="plain-syntax"> ((</span><span class="identifier-syntax">id</span><span class="plain-syntax">##</span><span class="identifier-syntax">_rcd_data</span><span class="plain-syntax"> *) </span><span class="identifier-syntax">rcd</span><span class="plain-syntax">-></span><span class="element-syntax">plugin_rcd</span><span class="plain-syntax">[</span><span class="identifier-syntax">id</span><span class="plain-syntax">##</span><span class="identifier-syntax">_plugin</span><span class="plain-syntax">-></span><span class="identifier-syntax">allocation_id</span><span class="plain-syntax">])</span>
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<span class="definition-keyword">define</span> <span class="identifier-syntax">CREATE_PLUGIN_RCD_DATA</span><span class="plain-syntax">(</span><span class="identifier-syntax">id</span><span class="plain-syntax">, </span><span class="identifier-syntax">rcd</span><span class="plain-syntax">, </span><span class="identifier-syntax">creator</span><span class="plain-syntax">)</span>
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<span class="plain-syntax"> (</span><span class="identifier-syntax">rcd</span><span class="plain-syntax">)-></span><span class="identifier-syntax">plugin_rcd</span><span class="plain-syntax">[</span><span class="identifier-syntax">id</span><span class="plain-syntax">##</span><span class="identifier-syntax">_plugin</span><span class="plain-syntax">-></span><span class="identifier-syntax">allocation_id</span><span class="plain-syntax">] = (</span><span class="reserved-syntax">void</span><span class="plain-syntax"> *) (</span><span class="identifier-syntax">creator</span><span class="plain-syntax">(</span><span class="identifier-syntax">rcd</span><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. Specificity. </b>The following is one of Inform's standardised comparison routines, which
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takes a pair of objects A, B and returns 1 if A makes a more specific
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description than B, 0 if they seem equally specific, or \(-1\) if B makes a
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more specific description than A. This is transitive, and intended to be
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used in sorting algorithms.
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</p>
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<p class="commentary">In this case, laws I to V are applied in turn until one is decisive. If
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all of them fail to decide, we return 0.
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">RuntimeContextData::compare_specificity</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">RuntimeContextData::compare_specificity</span></span>:<br/>Rules - <a href="6-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>
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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">rcd2</span><span class="plain-syntax">) {</span>
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<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">NULL</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>
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<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">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>
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<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">EMPTY_WORDING</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>
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<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="5-rcd.html#SP3_1" class="named-paragraph-link"><span class="named-paragraph">Extract these from the PHRCDs under comparison</span><span class="named-paragraph-number">3.1</span></a></span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="5-rcd.html#SP3_2" class="named-paragraph-link"><span class="named-paragraph">Apply comparison law I</span><span class="named-paragraph-number">3.2</span></a></span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="5-rcd.html#SP3_3" class="named-paragraph-link"><span class="named-paragraph">Apply comparison law II</span><span class="named-paragraph-number">3.3</span></a></span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="5-rcd.html#SP3_4" class="named-paragraph-link"><span class="named-paragraph">Apply comparison law III</span><span class="named-paragraph-number">3.4</span></a></span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="5-rcd.html#SP3_5" class="named-paragraph-link"><span class="named-paragraph">Apply comparison law IV</span><span class="named-paragraph-number">3.5</span></a></span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="5-rcd.html#SP3_6" class="named-paragraph-link"><span class="named-paragraph">Apply comparison law V</span><span class="named-paragraph-number">3.6</span></a></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="constant-syntax">0</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_1" class="paragraph-anchor"></a><b>§3.1. </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">3.1</span></span><span class="comment-syntax"> =</span>
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">rcd1</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">sc1</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Scenes::get_rcd_spec</span><span class="plain-syntax">(</span><span class="identifier-syntax">rcd1</span><span class="plain-syntax">); </span><span class="identifier-syntax">ap1</span><span class="plain-syntax"> = </span><span class="identifier-syntax">ActionRules::get_ap</span><span class="plain-syntax">(</span><span class="identifier-syntax">rcd1</span><span class="plain-syntax">);</span>
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<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>
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<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">rcd2</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">sc2</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Scenes::get_rcd_spec</span><span class="plain-syntax">(</span><span class="identifier-syntax">rcd2</span><span class="plain-syntax">); </span><span class="identifier-syntax">ap2</span><span class="plain-syntax"> = </span><span class="identifier-syntax">ActionRules::get_ap</span><span class="plain-syntax">(</span><span class="identifier-syntax">rcd2</span><span class="plain-syntax">);</span>
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<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>
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<span class="plain-syntax"> }</span>
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</pre>
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<ul class="endnotetexts"><li>This code is used in <a href="5-rcd.html#SP3">§3</a>.</li></ul>
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<p class="commentary firstcommentary"><a id="SP3_2" class="paragraph-anchor"></a><b>§3.2. </b>More constraints beats fewer.
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</p>
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<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">3.2</span></span><span class="comment-syntax"> =</span>
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="plain-syntax"> </span><span class="identifier-syntax">Specifications::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>
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<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="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="reserved-syntax">int</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="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="5-rcd.html#SP3">§3</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP3_3" class="paragraph-anchor"></a><b>§3.3. </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">3.3</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">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>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="5-rcd.html#SP3">§3</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP3_4" class="paragraph-anchor"></a><b>§3.4. </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">3.4</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">Specifications::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="5-rcd.html#SP5" class="function-link"><span class="function-syntax">RuntimeContextData::activity_list_count</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="5-rcd.html#SP5" class="function-link"><span class="function-syntax">RuntimeContextData::activity_list_count</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="5-rcd.html#SP3">§3</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP3_5" class="paragraph-anchor"></a><b>§3.5. </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">3.5</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">Specifications::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="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>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="5-rcd.html#SP3">§3</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP3_6" class="paragraph-anchor"></a><b>§3.6. </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">3.6</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">Specifications::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="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>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="5-rcd.html#SP3">§3</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP4" class="paragraph-anchor"></a><b>§4. Activity lists. </b>The activity list part of a RCD is a list of activities, one of which must
|
|
be currently running for the rule to fire. For example, in:
|
|
</p>
|
|
|
|
<blockquote>
|
|
<p>Rule for printing the name of the lemon sherbet while listing contents: ...</p>
|
|
</blockquote>
|
|
|
|
<p class="commentary">the activity list is just "listing contents". 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="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>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>The structure activity_list is accessed in 2/ptmn, 2/cs, 2/ps, 2/is, 3/dlr, 3/pr, 3/tr, 3/nuor, 3/uor, 3/tr2, 3/dbtr, 3/rpr, 3/nar, 3/nlpr, 3/nrr, 3/npr, 3/nvr, 3/nar2, 4/rpt, 4/tc, 4/ass, 4/npa, 4/rk, 4/ass2, 4/imp, 5/id, 5/adf, 6/rlb, 6/act, 7/tbl, 7/eqt, 8/tcp, 8/abp, 8/cu and here.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP5" class="paragraph-anchor"></a><b>§5. </b>The "count" of an activity list is a measure of its complexity:
|
|
</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">RuntimeContextData::activity_list_count</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">RuntimeContextData::activity_list_count</span></span>:<br/><a href="5-rcd.html#SP3_4">§3.4</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>
|
|
<p class="commentary firstcommentary"><a id="SP6" class="paragraph-anchor"></a><b>§6. </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">RuntimeContextData::ensure_avl</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">RuntimeContextData::ensure_avl</span></span>:<br/>Rulebooks - <a href="6-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="reserved-syntax">imperative_defn</span><span class="plain-syntax"> *</span><span class="identifier-syntax">id</span><span class="plain-syntax"> = </span><a href="6-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="reserved-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="element-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="element-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="element-syntax">at</span><span class="plain-syntax">;</span>
|
|
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">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">id_stack_frame</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Frames::make_current</span><span class="plain-syntax">(</span><span class="identifier-syntax">phsf</span><span class="plain-syntax">);</span>
|
|
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Frames::set_shared_variable_access_list</span><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="5-rcd.html#SP7" class="function-link"><span class="function-syntax">RuntimeContextData::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="SP7" class="paragraph-anchor"></a><b>§7. </b>Which calls down to:
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">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="reserved-syntax">activity_list</span><span class="plain-syntax"> *</span><span class="function-syntax">RuntimeContextData::parse_avl</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">RuntimeContextData::parse_avl</span></span>:<br/><a href="5-rcd.html#SP6">§6</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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<p class="commentary firstcommentary"><a id="SP8" class="paragraph-anchor"></a><b>§8. </b>Which in turn uses the following Preform grammar.
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</p>
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<p class="commentary">The direct handling of "something" below is to avoid Inform from reading it
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as "some thing", with the implication that a <span class="extract"><span class="extract-syntax">K_thing</span></span> value is meant. When
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people talk about "factorising something", where "factorising" is an activity
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on numbers, for example, they mean "something" to stand for "any number", not
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for "any physical object". Kind-checking means that only a number is possible
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anyway, so we can safely just ignore the word "something".
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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"><run-time-context></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">::=</span>
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<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="5-rcd.html#SP8_1" class="named-paragraph-link"><span class="named-paragraph">Flip the activity list parities</span><span class="named-paragraph-number">8.1</span></a></span><span class="Preform-constant-syntax">;</span>
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<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>
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|
<span class="Preform-function-syntax"><activity-list-unnegated></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">::=</span>
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<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>
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<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="5-rcd.html#SP8_2" class="named-paragraph-link"><span class="named-paragraph">Join the activity lists</span><span class="named-paragraph-number">8.2</span></a></span><span class="Preform-constant-syntax">;</span>
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<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>
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|
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|
<span class="Preform-function-syntax"><activity-tail></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">::=</span>
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|
<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>
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|
<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>
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|
<span class="Preform-function-syntax"><activity-list-entry></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">::=</span>
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|
<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="5-rcd.html#SP8_3" class="named-paragraph-link"><span class="named-paragraph">Make one-entry AL without operand</span><span class="named-paragraph-number">8.3</span></a></span>
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|
<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="5-rcd.html#SP8_4" class="named-paragraph-link"><span class="named-paragraph">Make one-entry AL with operand</span><span class="named-paragraph-number">8.4</span></a></span>
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<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="5-rcd.html#SP8_4" class="named-paragraph-link"><span class="named-paragraph">Make one-entry AL with operand</span><span class="named-paragraph-number">8.4</span></a></span>
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|
<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="5-rcd.html#SP8_5" class="named-paragraph-link"><span class="named-paragraph">Make one-entry AL with unparsed text</span><span class="named-paragraph-number">8.5</span></a></span>
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|
<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="5-rcd.html#SP8_6" class="named-paragraph-link"><span class="named-paragraph">Make one-entry AL with condition</span><span class="named-paragraph-number">8.6</span></a></span>
|
|
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|
<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>
|
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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>
|
|
<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>
|
|
<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>
|
|
<span class="Preform-plain-syntax">}</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>
|
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<p class="commentary firstcommentary"><a id="SP8_1" class="paragraph-anchor"></a><b>§8.1. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Flip the activity list parities</span><span class="named-paragraph-number">8.1</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>
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|
<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>
|
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</pre>
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|
<ul class="endnotetexts"><li>This code is used in <a href="5-rcd.html#SP8">§8</a>.</li></ul>
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|
<p class="commentary firstcommentary"><a id="SP8_2" class="paragraph-anchor"></a><b>§8.2. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Join the activity lists</span><span class="named-paragraph-number">8.2</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="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="5-rcd.html#SP8">§8</a>.</li></ul>
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|
<p class="commentary firstcommentary"><a id="SP8_3" class="paragraph-anchor"></a><b>§8.3. </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">8.3</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">al</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="5-rcd.html#SP8_3_1" class="named-paragraph-link"><span class="named-paragraph">Make one-entry AL</span><span class="named-paragraph-number">8.3.1</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>
|
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</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="5-rcd.html#SP8">§8</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP8_4" class="paragraph-anchor"></a><b>§8.4. </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">8.4</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
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<pre class="displayed-code all-displayed-code code-font">
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<span class="plain-syntax"> </span><span class="reserved-syntax">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>
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|
<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>
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|
<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>
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|
<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="5-rcd.html#SP8_3_1" class="named-paragraph-link"><span class="named-paragraph">Make one-entry AL</span><span class="named-paragraph-number">8.3.1</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">activity</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">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>
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</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="5-rcd.html#SP8">§8</a> (twice).</li></ul>
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|
<p class="commentary firstcommentary"><a id="SP8_5" class="paragraph-anchor"></a><b>§8.5. </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">8.5</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">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>
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|
<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="5-rcd.html#SP8_3_1" class="named-paragraph-link"><span class="named-paragraph">Make one-entry AL</span><span class="named-paragraph-number">8.3.1</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>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="5-rcd.html#SP8">§8</a>.</li></ul>
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|
<p class="commentary firstcommentary"><a id="SP8_6" class="paragraph-anchor"></a><b>§8.6. </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">8.6</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">RP</span><span class="plain-syntax">[2];</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">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="5-rcd.html#SP8_3_1" class="named-paragraph-link"><span class="named-paragraph">Make one-entry AL</span><span class="named-paragraph-number">8.3.1</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="5-rcd.html#SP8">§8</a>.</li></ul>
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<p class="commentary firstcommentary"><a id="SP8_3_1" class="paragraph-anchor"></a><b>§8.3.1. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Make one-entry AL</span><span class="named-paragraph-number">8.3.1</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="5-rcd.html#SP8_3">§8.3</a>, <a href="5-rcd.html#SP8_4">§8.4</a>, <a href="5-rcd.html#SP8_5">§8.5</a>, <a href="5-rcd.html#SP8_6">§8.6</a>.</li></ul>
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