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<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../compiler.html">Inform7</a></li><li><a href="index.html">runtime</a></li><li><a href="index.html#8">Chapter 8: Command Parser</a></li><li><b>Parsing</b></li></ul></div>
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. </b></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">RTParsing::understood_variable</span><span class="plain-syntax">(</span><span class="identifier-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">var</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><a href="5-vrb.html#SP2" class="function-link"><span class="function-syntax">RTVariables::set_I6_identifier</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">var</span><span class="plain-syntax">, </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><a href="5-vrb.html#SP1" class="function-link"><span class="function-syntax">RTVariables::nve_from_iname</span></a><span class="plain-syntax">(</span><a href="2-hrr.html#SP6" class="function-link"><span class="function-syntax">Hierarchy::find</span></a><span class="plain-syntax">(</span><span class="constant-syntax">PARSED_NUMBER_HL</span><span class="plain-syntax">)));</span>
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<span class="plain-syntax"> </span><a href="5-vrb.html#SP2" class="function-link"><span class="function-syntax">RTVariables::set_I6_identifier</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">var</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><a href="5-vrb.html#SP1" class="function-link"><span class="function-syntax">RTVariables::nve_from_iname</span></a><span class="plain-syntax">(</span><a href="2-hrr.html#SP6" class="function-link"><span class="function-syntax">Hierarchy::find</span></a><span class="plain-syntax">(</span><span class="constant-syntax">PARSED_NUMBER_HL</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 name property requires special care, partly over I6 eccentricities
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such as the way that single-letter dictionary words can be misinterpreted
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as characters (hence the double slash below), but also because something
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called "your ..." in the source text — "your nose", say — needs to
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be altered to "my ..." for purposes of parsing during play.
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</p>
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<p class="commentary">Note that <span class="extract"><span class="extract-syntax">name</span></span> is additive in I6 terms, meaning that its values
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accumulate from class down to instance: but we prevent this, by only
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compiling <span class="extract"><span class="extract-syntax">name</span></span> properties for instance objects directly. The practical
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consequence is that we have to imitate this inheritance when it comes
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to single-word grammar for things. Recall that a sentence like "Understand
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"cube" as the block" formally creates a grammar line which ought to
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be parsed as part of some elaborate <span class="extract"><span class="extract-syntax">parse_name</span></span> property: but that for
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efficiency's sake, we notice that "cube" is only one word and so put
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it into the <span class="extract"><span class="extract-syntax">name</span></span> property instead. And we need to perform the same trick
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for the kinds we inherit from.
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="function-syntax">RTParsing::name_property_array</span><span class="plain-syntax">(</span><span class="identifier-syntax">instance</span><span class="plain-syntax"> *</span><span class="identifier-syntax">I</span><span class="plain-syntax">, </span><span class="identifier-syntax">wording</span><span class="plain-syntax"> </span><span class="identifier-syntax">W</span><span class="plain-syntax">, </span><span class="identifier-syntax">wording</span><span class="plain-syntax"> </span><span class="identifier-syntax">PW</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">from_kind</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">package_request</span><span class="plain-syntax"> *</span><span class="identifier-syntax">PR</span><span class="plain-syntax"> =</span>
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<span class="plain-syntax"> </span><a href="2-hrr.html#SP6" class="function-link"><span class="function-syntax">Hierarchy::package_within</span></a><span class="plain-syntax">(</span><span class="constant-syntax">INLINE_PROPERTIES_HAP</span><span class="plain-syntax">, </span><a href="5-ins.html#SP4" class="function-link"><span class="function-syntax">RTInstances::package</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">));</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">inter_name</span><span class="plain-syntax"> *</span><span class="identifier-syntax">name_array</span><span class="plain-syntax"> = </span><a href="2-hrr.html#SP6" class="function-link"><span class="function-syntax">Hierarchy::make_iname_in</span></a><span class="plain-syntax">(</span><span class="constant-syntax">INLINE_PROPERTY_HL</span><span class="plain-syntax">, </span><span class="identifier-syntax">PR</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">packaging_state</span><span class="plain-syntax"> </span><span class="identifier-syntax">save</span><span class="plain-syntax"> = </span><a href="2-emt.html#SP18" class="function-link"><span class="function-syntax">Emit::named_array_begin</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">name_array</span><span class="plain-syntax">, </span><span class="identifier-syntax">K_value</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_THROUGH_WORDING</span><span class="plain-syntax">(</span><span class="identifier-syntax">j</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">vocabulary_entry</span><span class="plain-syntax"> *</span><span class="identifier-syntax">ve</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Lexer::word</span><span class="plain-syntax">(</span><span class="identifier-syntax">j</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">ve</span><span class="plain-syntax"> = </span><span class="identifier-syntax">PreformUtilities::find_corresponding_word</span><span class="plain-syntax">(</span><span class="identifier-syntax">ve</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="function-syntax"><second-person-possessive-pronoun-table></span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="function-syntax"><first-person-possessive-pronoun-table></span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">wchar_t</span><span class="plain-syntax"> *</span><span class="identifier-syntax">p</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Vocabulary::get_exemplar</span><span class="plain-syntax">(</span><span class="identifier-syntax">ve</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">TEMPORARY_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">content</span><span class="plain-syntax">)</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">content</span><span class="plain-syntax">, </span><span class="string-syntax">"%w"</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><a href="2-emt.html#SP18" class="function-link"><span class="function-syntax">Emit::array_dword_entry</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">content</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">DISCARD_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">content</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">from_kind</span><span class="plain-syntax">) </span><span class="comment-syntax"> see test case PM_PluralsFromKind</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_THROUGH_WORDING</span><span class="plain-syntax">(</span><span class="identifier-syntax">j</span><span class="plain-syntax">, </span><span class="identifier-syntax">PW</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">additional</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">LOOP_THROUGH_WORDING</span><span class="plain-syntax">(</span><span class="identifier-syntax">k</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">compare_word</span><span class="plain-syntax">(</span><span class="identifier-syntax">j</span><span class="plain-syntax">, </span><span class="identifier-syntax">Lexer::word</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="identifier-syntax">additional</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">additional</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">TEMPORARY_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">content</span><span class="plain-syntax">)</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">content</span><span class="plain-syntax">, </span><span class="string-syntax">"%w"</span><span class="plain-syntax">, </span><span class="identifier-syntax">Lexer::word_text</span><span class="plain-syntax">(</span><span class="identifier-syntax">j</span><span class="plain-syntax">));</span>
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<span class="plain-syntax"> </span><a href="2-emt.html#SP18" class="function-link"><span class="function-syntax">Emit::array_plural_dword_entry</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">content</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">DISCARD_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">content</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">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">PARSING_DATA</span><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">)-></span><span class="identifier-syntax">understand_as_this_object</span><span class="plain-syntax">)</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">CommandGrammars::take_out_one_word_grammar</span><span class="plain-syntax">(</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">PARSING_DATA</span><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">)-></span><span class="identifier-syntax">understand_as_this_object</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">infs</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="identifier-syntax">infs</span><span class="plain-syntax"> = </span><span class="identifier-syntax">KindSubjects::from_kind</span><span class="plain-syntax">(</span><span class="identifier-syntax">Instances::to_kind</span><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">));</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">infs</span><span class="plain-syntax">; </span><span class="identifier-syntax">infs</span><span class="plain-syntax"> = </span><span class="identifier-syntax">InferenceSubjects::narrowest_broader_subject</span><span class="plain-syntax">(</span><span class="identifier-syntax">infs</span><span class="plain-syntax">)) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">PARSING_DATA_FOR_SUBJ</span><span class="plain-syntax">(</span><span class="identifier-syntax">infs</span><span class="plain-syntax">)) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">PARSING_DATA_FOR_SUBJ</span><span class="plain-syntax">(</span><span class="identifier-syntax">infs</span><span class="plain-syntax">)-></span><span class="identifier-syntax">understand_as_this_object</span><span class="plain-syntax">)</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">CommandGrammars::take_out_one_word_grammar</span><span class="plain-syntax">(</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">PARSING_DATA_FOR_SUBJ</span><span class="plain-syntax">(</span><span class="identifier-syntax">infs</span><span class="plain-syntax">)-></span><span class="identifier-syntax">understand_as_this_object</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><a href="2-emt.html#SP18" class="function-link"><span class="function-syntax">Emit::array_end</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">save</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Produce::annotate_i</span><span class="plain-syntax">(</span><span class="identifier-syntax">name_array</span><span class="plain-syntax">, </span><span class="identifier-syntax">INLINE_ARRAY_IANN</span><span class="plain-syntax">, </span><span class="constant-syntax">1</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">Rvalues::from_iname</span><span class="plain-syntax">(</span><span class="identifier-syntax">name_array</span><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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<span class="identifier-syntax">inter_name</span><span class="plain-syntax"> *</span><span class="function-syntax">RTParsing::name_iname</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">RTParsing::name_iname</span></span>:<br/>General Parsing Routines - <a href="8-gpr.html#SP6">§6</a>, <a href="8-gpr.html#SP8">§8</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">return</span><span class="plain-syntax"> </span><a href="5-prp.html#SP6" class="function-link"><span class="function-syntax">RTProperties::iname</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">ParsingPlugin::name_property</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>We cache grammar occurring in the source text in conditions, and so forth:
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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">cached_understanding</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">understanding_text</span><span class="plain-syntax">; </span><span class="comment-syntax"> word range of the understanding text</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">inter_name</span><span class="plain-syntax"> *</span><span class="identifier-syntax">cu_iname</span><span class="plain-syntax">; </span><span class="comment-syntax"> the runtime name for this </span><span class="extract"><span class="extract-syntax">Consult_Grammar_N</span></span><span class="comment-syntax"> routine</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">cached_understanding</span><span class="plain-syntax">;</span>
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">RTParsing::compile_understanding</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">RTParsing::compile_understanding</span></span>:<br/>Runtime Support for Tables - <a href="5-rsft.html#SP4_1_1_1_1_4">§4.1.1.1.1.4</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">inter_ti</span><span class="plain-syntax"> *</span><span class="identifier-syntax">val1</span><span class="plain-syntax">, </span><span class="identifier-syntax">inter_ti</span><span class="plain-syntax"> *</span><span class="identifier-syntax">val2</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">if</span><span class="plain-syntax"> (</span><span class="function-syntax"><subject-pronoun></span><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">)) { *</span><span class="identifier-syntax">val1</span><span class="plain-syntax"> = </span><span class="identifier-syntax">LITERAL_IVAL</span><span class="plain-syntax">; *</span><span class="identifier-syntax">val2</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">; }</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">cached_understanding</span><span class="plain-syntax"> *</span><span class="identifier-syntax">cu</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_OVER</span><span class="plain-syntax">(</span><span class="identifier-syntax">cu</span><span class="plain-syntax">, </span><span class="reserved-syntax">cached_understanding</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::match</span><span class="plain-syntax">(</span><span class="identifier-syntax">cu</span><span class="plain-syntax">-></span><span class="element-syntax">understanding_text</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><a href="2-emt.html#SP19" class="function-link"><span class="function-syntax">Emit::to_ival</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">val1</span><span class="plain-syntax">, </span><span class="identifier-syntax">val2</span><span class="plain-syntax">, </span><span class="identifier-syntax">cu</span><span class="plain-syntax">-></span><span class="element-syntax">cu_iname</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="identifier-syntax">command_grammar</span><span class="plain-syntax"> *</span><span class="identifier-syntax">cg</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Understand::consultation</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">inter_name</span><span class="plain-syntax"> *</span><span class="identifier-syntax">iname</span><span class="plain-syntax"> = </span><a href="8-gpr.html#SP3" class="function-link"><span class="function-syntax">UnderstandGeneralTokens::consult_iname</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">cg</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">iname</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">cu</span><span class="plain-syntax"> = </span><span class="identifier-syntax">CREATE</span><span class="plain-syntax">(</span><span class="reserved-syntax">cached_understanding</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">cu</span><span class="plain-syntax">-></span><span class="element-syntax">understanding_text</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">cu</span><span class="plain-syntax">-></span><span class="element-syntax">cu_iname</span><span class="plain-syntax"> = </span><span class="identifier-syntax">iname</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><a href="2-emt.html#SP19" class="function-link"><span class="function-syntax">Emit::to_ival</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">val1</span><span class="plain-syntax">, </span><span class="identifier-syntax">val2</span><span class="plain-syntax">, </span><span class="identifier-syntax">iname</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>
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</pre>
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<ul class="endnotetexts"><li>The structure cached_understanding is private to this section.</li></ul>
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