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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">knowledge</a></li><li><a href="index.html#2">Chapter 2: Instances and Variables</a></li><li><b>Preform for Instances</b></li></ul></div>
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<p class="purpose">To manage constant values of enumerated kinds or kinds of object.</p>
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. </b>Ordinarily these constants are read by the S-parser in the normal way that
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all constants are read — see <a href="../values-module/index.html" class="internal">values</a> — but it's occasionally useful to
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bypass that and just parse text as an instance name and nothing else.
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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">instance</span><span class="plain-syntax"> *</span><span class="function-syntax">InstancesPreform::parse_object</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">InstancesPreform::parse_object</span></span>:<br/><a href="2-pfi.html#SP2">§2</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>
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<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">W</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">if</span><span class="plain-syntax"> (</span><span class="function-syntax"><s-literal></span><span class="plain-syntax">(</span><span class="identifier-syntax">W</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="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">NOUN_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="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="identifier-syntax">noun_usage</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nu</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Nouns::disambiguate</span><span class="plain-syntax">(</span><span class="identifier-syntax">p</span><span class="plain-syntax">, </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">noun</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nt</span><span class="plain-syntax"> = </span><span class="identifier-syntax">nu</span><span class="plain-syntax">-></span><span class="identifier-syntax">noun_used</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">Nouns::is_proper</span><span class="plain-syntax">(</span><span class="identifier-syntax">nt</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">pn</span><span class="plain-syntax"> = </span><span class="identifier-syntax">RETRIEVE_POINTER_parse_node</span><span class="plain-syntax">(</span><span class="identifier-syntax">Nouns::meaning</span><span class="plain-syntax">(</span><span class="identifier-syntax">nt</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">Node::is</span><span class="plain-syntax">(</span><span class="identifier-syntax">pn</span><span class="plain-syntax">, </span><span class="identifier-syntax">CONSTANT_NT</span><span class="plain-syntax">)) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">K</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Node::get_kind_of_value</span><span class="plain-syntax">(</span><span class="identifier-syntax">pn</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">Kinds::Behaviour::is_object</span><span class="plain-syntax">(</span><span class="identifier-syntax">K</span><span class="plain-syntax">))</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">Node::get_constant_instance</span><span class="plain-syntax">(</span><span class="identifier-syntax">pn</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax"> }</span>
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<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="SP2" class="paragraph-anchor"></a><b>§2. </b>The first internal matches only instances of kinds within the objects;
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the second matches the others; and the third all instances, of whatever kind.
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="function-syntax"><instance-of-object></span><span class="plain-syntax"> </span><span class="identifier-syntax">internal</span><span class="plain-syntax"> {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">instance</span><span class="plain-syntax"> *</span><span class="identifier-syntax">I</span><span class="plain-syntax"> = </span><a href="2-pfi.html#SP1" class="function-link"><span class="function-syntax">InstancesPreform::parse_object</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">I</span><span class="plain-syntax">) { ==> { -, </span><span class="identifier-syntax">I</span><span class="plain-syntax"> }; </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">; }</span>
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<span class="plain-syntax"> ==> { </span><span class="identifier-syntax">fail</span><span class="plain-syntax"> </span><span class="identifier-syntax">nonterminal</span><span class="plain-syntax"> };</span>
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<span class="plain-syntax">}</span>
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<span class="function-syntax"><instance-of-non-object></span><span class="plain-syntax"> </span><span class="identifier-syntax">internal</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_CONSTANT_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">instance</span><span class="plain-syntax"> *</span><span class="identifier-syntax">I</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Rvalues::to_instance</span><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">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">I</span><span class="plain-syntax">) { ==> { -, </span><span class="identifier-syntax">I</span><span class="plain-syntax"> }; </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">; }</span>
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<span class="plain-syntax"> ==> { </span><span class="identifier-syntax">fail</span><span class="plain-syntax"> </span><span class="identifier-syntax">nonterminal</span><span class="plain-syntax"> };</span>
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<span class="plain-syntax">}</span>
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<span class="function-syntax"><instance></span><span class="plain-syntax"> </span><span class="identifier-syntax">internal</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"><s-literal></span><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">)) { ==> { </span><span class="identifier-syntax">fail</span><span class="plain-syntax"> </span><span class="identifier-syntax">nonterminal</span><span class="plain-syntax"> }; }</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">W</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Articles::remove_the</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">instance</span><span class="plain-syntax"> *</span><span class="identifier-syntax">I</span><span class="plain-syntax"> = </span><a href="2-pfi.html#SP1" class="function-link"><span class="function-syntax">InstancesPreform::parse_object</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">I</span><span class="plain-syntax">) { ==> { -, </span><span class="identifier-syntax">I</span><span class="plain-syntax"> }; </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">; }</span>
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<span class="plain-syntax"> </span><span class="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_CONSTANT_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="identifier-syntax">I</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Rvalues::to_instance</span><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">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">I</span><span class="plain-syntax">) { ==> { -, </span><span class="identifier-syntax">I</span><span class="plain-syntax"> }; </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">; }</span>
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<span class="plain-syntax"> ==> { </span><span class="identifier-syntax">fail</span><span class="plain-syntax"> </span><span class="identifier-syntax">nonterminal</span><span class="plain-syntax"> };</span>
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<span class="plain-syntax">}</span>
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