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<!--Weave of 'Named Action Patterns' 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="../inform7n.html">Inform7</a></li><li><a href="index.html">if</a></li><li><a href="index.html#4">Chapter 4: Actions</a></li><li><b>Named Action Patterns</b></li></ul></div>
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<p class="purpose">A named action pattern is a categorisation of behaviour.</p>
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. </b>Behaviour such as "acting suspiciously" is stored as a named action pattern,
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which is little more than a list of action patterns; a given action falls under
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this category if it matches one of the patterns.
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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">named_action_pattern</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">noun</span><span class="plain-syntax"> *</span><span class="identifier-syntax">as_noun</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">linked_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">patterns</span><span class="plain-syntax">; </span><span class="comment-syntax"> of </span><span class="extract"><span class="extract-syntax">action_pattern</span></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">text_of_declaration</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">nap_compilation_data</span><span class="plain-syntax"> </span><span class="identifier-syntax">compilation_data</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">CLASS_DEFINITION</span>
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<span class="plain-syntax">} </span><span class="reserved-syntax">named_action_pattern</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">named_action_pattern_entry</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="reserved-syntax">action_pattern</span><span class="plain-syntax"> *</span><span class="identifier-syntax">behaviour</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">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">where_decided</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">CLASS_DEFINITION</span>
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<span class="plain-syntax">} </span><span class="reserved-syntax">named_action_pattern_entry</span><span class="plain-syntax">;</span>
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</pre>
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<ul class="endnotetexts"><li>The structure named_action_pattern is accessed in 4/ap, 4/anaa, 4/act, 4/as, 4/ann, 4/anl, 4/gng, 5/pp, 5/cg, 5/cgl, 5/ts and here.</li><li>The structure named_action_pattern_entry 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>We are allowed to give names to certain kinds of behaviour by "characterising"
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an action.
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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">NamedActionPatterns::characterise</span><span class="plain-syntax">(</span><span class="reserved-syntax">action_pattern</span><span class="plain-syntax"> *</span><span class="identifier-syntax">ap</span><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="identifier-syntax">LOGIF</span><span class="plain-syntax">(</span><span class="identifier-syntax">ACTION_PATTERN_PARSING</span><span class="plain-syntax">, </span><span class="string-syntax">"Characterising the action:\n$A...as %W\n"</span><span class="plain-syntax">, </span><span class="identifier-syntax">ap</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">if</span><span class="plain-syntax"> (</span><span class="function-syntax"><article></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">StandardProblems::sentence_problem</span><span class="plain-syntax">(</span><span class="identifier-syntax">Task::syntax_tree</span><span class="plain-syntax">(), </span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_NamedAPIsArticle</span><span class="plain-syntax">),</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"there's only an article here"</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"not a name, so I'm not sure what this action is supposed to be."</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>
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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><a href="4-apc.html#SP7" class="function-link"><span class="function-syntax">APClauses::spec</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">ap</span><span class="plain-syntax">, </span><span class="constant-syntax">ACTOR_AP_CLAUSE</span><span class="plain-syntax">)) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">StandardProblems::sentence_problem</span><span class="plain-syntax">(</span><span class="identifier-syntax">Task::syntax_tree</span><span class="plain-syntax">(), </span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_NamedAPWithActor</span><span class="plain-syntax">),</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"behaviour characterised by named action patterns can only specify the action"</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"not the actor: as a result, it cannot include requests to other people to "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"do things."</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>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax"> </span><a href="4-nap.html#SP3" class="function-link"><span class="function-syntax">NamedActionPatterns::add</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">ap</span><span class="plain-syntax">, </span><span class="identifier-syntax">W</span><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP3" class="paragraph-anchor"></a><b>§3. </b>So, then, the following adds an action pattern to a NAP identified only by its name, <span class="extract"><span class="extract-syntax">W</span></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="reserved-syntax">named_action_pattern</span><span class="plain-syntax"> *</span><span class="function-syntax">NamedActionPatterns::add</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">NamedActionPatterns::add</span></span>:<br/><a href="4-nap.html#SP2">§2</a><br/>Parse Clauses - <a href="4-pc.html#SP3_4">§3.4</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">action_pattern</span><span class="plain-syntax"> *</span><span class="identifier-syntax">ap</span><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">named_action_pattern</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nap</span><span class="plain-syntax"> = </span><a href="4-nap.html#SP3" class="function-link"><span class="function-syntax">NamedActionPatterns::by_name</span></a><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">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">nap</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="identifier-syntax">nap</span><span class="plain-syntax"> = </span><a href="4-nap.html#SP3" class="function-link"><span class="function-syntax">NamedActionPatterns::new</span></a><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">named_action_pattern_entry</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nape</span><span class="plain-syntax"> = </span><span class="identifier-syntax">CREATE</span><span class="plain-syntax">(</span><span class="reserved-syntax">named_action_pattern_entry</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">nape</span><span class="plain-syntax">-></span><span class="identifier-syntax">behaviour</span><span class="plain-syntax"> = </span><span class="identifier-syntax">ap</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">nape</span><span class="plain-syntax">-></span><span class="identifier-syntax">where_decided</span><span class="plain-syntax"> = </span><span class="identifier-syntax">current_sentence</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">ADD_TO_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">nape</span><span class="plain-syntax">, </span><span class="reserved-syntax">named_action_pattern_entry</span><span class="plain-syntax">, </span><span class="identifier-syntax">nap</span><span class="plain-syntax">-></span><span class="element-syntax">patterns</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">nap</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">named_action_pattern</span><span class="plain-syntax"> *</span><span class="function-syntax">NamedActionPatterns::by_name</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">NamedActionPatterns::by_name</span></span>:<br/><a href="4-nap.html#SP4">§4</a><br/>Actions - <a href="4-act.html#SP5">§5</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="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">p</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Lexicon::retrieve</span><span class="plain-syntax">(</span><span class="identifier-syntax">NAMED_AP_MC</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">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">p</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="4-ak.html#SP6" class="function-link"><span class="function-syntax">ARvalues::to_named_action_pattern</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">p</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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<span class="reserved-syntax">named_action_pattern</span><span class="plain-syntax"> *</span><span class="function-syntax">NamedActionPatterns::new</span><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">named_action_pattern</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nap</span><span class="plain-syntax"> = </span><span class="identifier-syntax">CREATE</span><span class="plain-syntax">(</span><span class="reserved-syntax">named_action_pattern</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">nap</span><span class="plain-syntax">-></span><span class="element-syntax">patterns</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NEW_LINKED_LIST</span><span class="plain-syntax">(</span><span class="reserved-syntax">named_action_pattern_entry</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">nap</span><span class="plain-syntax">-></span><span class="element-syntax">text_of_declaration</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">nap</span><span class="plain-syntax">-></span><span class="element-syntax">compilation_data</span><span class="plain-syntax"> = </span><span class="identifier-syntax">RTNamedActionPatterns::new</span><span class="plain-syntax">(</span><span class="identifier-syntax">nap</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">nap</span><span class="plain-syntax">-></span><span class="element-syntax">as_noun</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Nouns::new_proper_noun</span><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">, </span><span class="identifier-syntax">NEUTER_GENDER</span><span class="plain-syntax">, </span><span class="identifier-syntax">ADD_TO_LEXICON_NTOPT</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">NAMED_AP_MC</span><span class="plain-syntax">, </span><a href="4-ak.html#SP6" class="function-link"><span class="function-syntax">ARvalues::from_named_action_pattern</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">nap</span><span class="plain-syntax">), </span><span class="identifier-syntax">Task::language_of_syntax</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">nap</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP4" class="paragraph-anchor"></a><b>§4. </b>A Preform version of the parser-by-name:
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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"><named-action-pattern></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">{</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">named_action_pattern</span><span class="Preform-plain-syntax"> *</span><span class="Preform-identifier-syntax">nap</span><span class="Preform-plain-syntax"> = </span><a href="4-nap.html#SP3" class="function-link"><span class="Preform-function-syntax">NamedActionPatterns::by_name</span></a><span class="Preform-plain-syntax">(</span><span class="Preform-identifier-syntax">W</span><span class="Preform-plain-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">nap</span><span class="Preform-plain-syntax">) {</span>
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<span class="Preform-plain-syntax"> ==> { -, </span><span class="Preform-identifier-syntax">nap</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>
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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="SP5" class="paragraph-anchor"></a><b>§5. </b>And here we test whether a given action name appears in a NAP, which it does
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if and only if it appears in one of the patterns in the list:
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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">NamedActionPatterns::covers_action</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">NamedActionPatterns::covers_action</span></span>:<br/>Action Name Lists - <a href="4-anl.html#SP13">§13</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">named_action_pattern</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nap</span><span class="plain-syntax">, </span><span class="reserved-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">named_action_pattern_entry</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nape</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">nap</span><span class="plain-syntax">)</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_OVER_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">nape</span><span class="plain-syntax">, </span><span class="reserved-syntax">named_action_pattern_entry</span><span class="plain-syntax">, </span><span class="identifier-syntax">nap</span><span class="plain-syntax">-></span><span class="element-syntax">patterns</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="4-ap2.html#SP7" class="function-link"><span class="function-syntax">ActionPatterns::covers_action</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">nape</span><span class="plain-syntax">-></span><span class="element-syntax">behaviour</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">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">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>
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</pre>
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