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<!--Weave of 'Conditions and Phrases' 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 Modules</a></li><li><a href="index.html">core</a></li><li><a href="index.html#10">Chapter 10: The S-Parser</a></li><li><b>Conditions and Phrases</b></li></ul></div>
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<p class="purpose">To parse the text of To... phrases, say phrases and conditions.</p>
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<ul class="toc"><li><a href="10-cap.html#SP1">§1. Conditions</a></li><li><a href="10-cap.html#SP9">§9. Command phrases</a></li></ul><hr class="tocbar">
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. Conditions. </b>A condition is an excerpt of text which measures the truth of something.
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We will call a condition "pure" if it is self-sufficient, rather than
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referring anaphorically to some implied subject. For instance,
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</p>
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<blockquote>
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<p>if the bucket is an open container, ...</p>
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</blockquote>
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<p class="commentary">contains a pure condition, but
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</p>
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<blockquote>
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<p>if an open container, ...</p>
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</blockquote>
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<p class="commentary">is impure. We are very wary of impure conditions, and don't allow the
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logical operations or chronological restrictions to apply to them. So the
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only valid impure conditions are description noun phrases.
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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"><s-condition-uncached></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"><s-condition-pure></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"> { pass 1 }</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-descriptive-np></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> { pass 1 }</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="SP2" class="paragraph-anchor"></a><b>§2. </b>Now for pure conditions. Note that logical "and" and "or" are implemented
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directly right here, rather than being phrases defined in the Standard Rules,
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and that they aren't the same as the "and" and "or" used a list dividers.
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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"><s-condition-pure></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-function-syntax"><s-condition-pure></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"> { pass 1 }</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-condition-pure></span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">,</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">and</span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-condition-pure></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"> { -, Conditions::new_LOGICAL_AND(RP[1], RP[2]) }</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-condition-pure></span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">and</span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-condition-pure></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"> { -, Conditions::new_LOGICAL_AND(RP[1], RP[2]) }</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-condition-pure></span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">,</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">or</span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-condition-pure></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"> { -, Conditions::new_LOGICAL_OR(RP[1], RP[2]) }</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-condition-pure></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"><s-condition-pure></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"> { -, Conditions::new_LOGICAL_OR(RP[1], RP[2]) }</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-condition-with-chronology></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"> { pass 1 }</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-condition-atomic></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> { pass 1 }</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="SP3" class="paragraph-anchor"></a><b>§3. </b>Chronological restrictions include, for instance,
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</p>
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<blockquote>
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<p>if the gate is open for the first time, ...</p>
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</blockquote>
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<p class="commentary">where the condition is divided as
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</p>
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<blockquote>
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<p>if the gate is open / for the first time</p>
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</blockquote>
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<p class="commentary">and <s-condition-atomic> is used to parse the first half. While it's possible
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to express this in Preform grammar, the result doesn't run quickly, so I've
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implemented this as a hand-coded nonterminal instead.
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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"><s-condition-with-chronology></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-identifier-syntax">ifdef</span><span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">IF_MODULE</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">time_period</span><span class="Preform-plain-syntax"> *</span><span class="Preform-identifier-syntax">tp</span><span class="Preform-plain-syntax"> = </span><span class="Preform-identifier-syntax">Occurrence::parse</span><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">tp</span><span class="Preform-plain-syntax">) {</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">wording</span><span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">RW</span><span class="Preform-plain-syntax"> = </span><span class="Preform-identifier-syntax">Occurrence::unused_wording</span><span class="Preform-plain-syntax">(</span><span class="Preform-identifier-syntax">tp</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">Wordings::nonempty</span><span class="Preform-plain-syntax">(</span><span class="Preform-identifier-syntax">RW</span><span class="Preform-plain-syntax">)) && (</span><span class="Preform-function-syntax"><s-condition-atomic></span><span class="Preform-plain-syntax">(</span><span class="Preform-identifier-syntax">RW</span><span class="Preform-plain-syntax">))) {</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">parse_node</span><span class="Preform-plain-syntax"> *</span><span class="Preform-identifier-syntax">atomic_cnd</span><span class="Preform-plain-syntax"> = </span><span class="Preform-function-syntax"><<rp>></span><span class="Preform-plain-syntax">;</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">parse_node</span><span class="Preform-plain-syntax"> *</span><span class="Preform-identifier-syntax">spec</span><span class="Preform-plain-syntax"> = </span><span class="Preform-identifier-syntax">atomic_cnd</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">Node::is</span><span class="Preform-plain-syntax">(</span><span class="Preform-identifier-syntax">spec</span><span class="Preform-plain-syntax">, </span><span class="Preform-constant-syntax">CONSTANT_NT</span><span class="Preform-plain-syntax">)) {</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">action_pattern</span><span class="Preform-plain-syntax"> *</span><span class="Preform-identifier-syntax">ap</span><span class="Preform-plain-syntax"> = </span><a href="14-rv.html#SP2" class="function-link"><span class="Preform-function-syntax">Rvalues::to_action_pattern</span></a><span class="Preform-plain-syntax">(</span><span class="Preform-identifier-syntax">spec</span><span class="Preform-plain-syntax">);</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">spec</span><span class="Preform-plain-syntax"> = </span><a href="14-cn.html#SP10" class="function-link"><span class="Preform-function-syntax">Conditions::new_TEST_ACTION</span></a><span class="Preform-plain-syntax">(</span><span class="Preform-identifier-syntax">ap</span><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>
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<span class="Preform-plain-syntax"> ==> { -, </span><a href="14-cn.html#SP11" class="function-link"><span class="Preform-function-syntax">Conditions::attach_historic_requirement</span></a><span class="Preform-plain-syntax">(</span><span class="Preform-identifier-syntax">spec</span><span class="Preform-plain-syntax">, </span><span class="Preform-identifier-syntax">tp</span><span class="Preform-plain-syntax">) };</span>
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<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>
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<span class="Preform-plain-syntax"> #</span><span class="Preform-identifier-syntax">endif</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="SP4" class="paragraph-anchor"></a><b>§4. </b>The syntax for the logical operation "not" is more complicated, because
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it only sometimes work by simply preceding the text with "not". Consider
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this, for instance:
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</p>
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<blockquote>
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<p>if not we are carrying the torch, ...</p>
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</blockquote>
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<p class="commentary">As a result, we can't handle negation in <s-condition-pure>, and have to
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work into the grammar below on a case by case basis. And where we do allow
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"not", we always check the positive sense first — people do sometimes
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create phrase options like "not printing anything", for example, which
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begin with the word "not".
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</p>
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<p class="commentary">As a condition, an action pattern is implicitly considered as a test of
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what the current action is:
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</p>
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<blockquote>
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<p>if examining an open door, ...</p>
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</blockquote>
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<p class="commentary">This wouldn't work so well for the past tense form:
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</p>
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<blockquote>
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<p>if examined an open door, ...</p>
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</blockquote>
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<p class="commentary">because it seems too clunky as neither quite active nor passive. Who examined
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the open door? So Inform uses the following version instead:
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</p>
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<blockquote>
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<p>if we have examined an open door, ...</p>
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</blockquote>
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<p class="commentary">thus adopting the "science we". Not very elegant, but the alternatives were
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difficult to parse. "We are" is allowed for consistency's sake, but does
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nothing, i.e., "we are taking" and "taking" are synonymous. Translators
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to other languages may want to find more elegant solutions.
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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"><s-condition-atomic></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"><s-phrase-option-in-use></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"> { pass 1 }</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"><s-phrase-option-in-use></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"> { -, Conditions::negate(RP[1]) }</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-nonexistential-phrase-to-decide></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"> { pass 1 }</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-past-action-pattern-as-condition></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"> { pass 1 }</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-past-action-pattern-as-negated-condition></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"> { -, Conditions::negate(RP[1]) }</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-action-pattern-as-condition></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"> { pass 1 }</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-action-pattern-as-negated-condition></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"> { -, Conditions::negate(RP[1]) }</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-sentence></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"> { pass 1 }</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-existential-phrase-to-decide></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> { pass 1 }</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>
|
|
<p class="commentary firstcommentary"><a id="SP5" class="paragraph-anchor"></a><b>§5. </b>As before, we try to get better sensitivity to ambiguities by dividing the
|
|
test for a phrase-to-decide into two, so that the following is used at a
|
|
different point if the excerpt begins "there is" than if it doesn't. The
|
|
point of this is that some phrases to decide have wording which coincides
|
|
with a description, and in general the phrase should win, but in the case
|
|
of "there is" we make the presumption that the author intends a sentence
|
|
testing the existence of something.
|
|
</p>
|
|
|
|
<pre class="Preform-displayed-code all-displayed-code code-font">
|
|
<span class="Preform-function-syntax"><s-nonexistential-phrase-to-decide></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">::=</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><existential-verb-phrase></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"> { fail }</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-phrase-to-decide></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"> { pass 1 }</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">not</span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-phrase-to-decide></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> { -, Conditions::negate(RP[1]) }</span>
|
|
|
|
<span class="Preform-function-syntax"><s-existential-phrase-to-decide></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">::=</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">^<existential-verb-phrase></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"> { fail }</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-phrase-to-decide></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"> { pass 1 }</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">not</span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-phrase-to-decide></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> { -, Conditions::negate(RP[1]) }</span>
|
|
|
|
<span class="Preform-function-syntax"><existential-verb-phrase></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">::=</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><np-existential></span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">is/are</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">...</span>
|
|
|
|
<span class="Preform-function-syntax"><s-phrase-to-decide></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>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">parse_node</span><span class="Preform-plain-syntax"> *</span><span class="Preform-identifier-syntax">p</span><span class="Preform-plain-syntax"> = </span><span class="Preform-identifier-syntax">Lexicon::retrieve</span><span class="Preform-plain-syntax">(</span><span class="Preform-constant-syntax">COND_PHRASE_MC</span><span class="Preform-plain-syntax">, </span><span class="Preform-identifier-syntax">W</span><span class="Preform-plain-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">p</span><span class="Preform-plain-syntax">) {</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">parse_node</span><span class="Preform-plain-syntax"> *</span><span class="Preform-identifier-syntax">spec</span><span class="Preform-plain-syntax"> = </span><span class="Preform-identifier-syntax">Node::new_with_words</span><span class="Preform-plain-syntax">(</span><span class="Preform-constant-syntax">PHRASE_TO_DECIDE_VALUE_NT</span><span class="Preform-plain-syntax">, </span><span class="Preform-identifier-syntax">W</span><span class="Preform-plain-syntax">);</span>
|
|
<span class="Preform-plain-syntax"> </span><a href="10-cap.html#SP12" class="function-link"><span class="Preform-function-syntax">ExParser::add_ilist</span></a><span class="Preform-plain-syntax">(</span><span class="Preform-identifier-syntax">spec</span><span class="Preform-plain-syntax">, </span><span class="Preform-identifier-syntax">p</span><span class="Preform-plain-syntax">);</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">parse_node</span><span class="Preform-plain-syntax"> *</span><span class="Preform-identifier-syntax">tval</span><span class="Preform-plain-syntax"> = </span><span class="Preform-identifier-syntax">Node::new_with_words</span><span class="Preform-plain-syntax">(</span><span class="Preform-constant-syntax">TEST_VALUE_NT</span><span class="Preform-plain-syntax">, </span><span class="Preform-identifier-syntax">W</span><span class="Preform-plain-syntax">);</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">tval</span><span class="Preform-plain-syntax">-></span><span class="Preform-element-syntax">down</span><span class="Preform-plain-syntax"> = </span><span class="Preform-identifier-syntax">spec</span><span class="Preform-plain-syntax">;</span>
|
|
<span class="Preform-plain-syntax"> ==> { -, </span><span class="Preform-identifier-syntax">tval</span><span class="Preform-plain-syntax"> };</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-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>
|
|
<p class="commentary firstcommentary"><a id="SP6" class="paragraph-anchor"></a><b>§6. </b>The following only matches the phrase option names for the phrase currently
|
|
being compiled; all others are out of scope.
|
|
</p>
|
|
|
|
<pre class="Preform-displayed-code all-displayed-code code-font">
|
|
<span class="Preform-function-syntax"><s-phrase-option-in-use></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>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">if</span><span class="Preform-plain-syntax"> (</span><span class="Preform-identifier-syntax">phrase_being_compiled</span><span class="Preform-plain-syntax">) {</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">int</span><span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">i</span><span class="Preform-plain-syntax"> = </span><a href="22-tp.html#SP11" class="function-link"><span class="Preform-function-syntax">Routines::ToPhrases::parse_phrase_option_used</span></a><span class="Preform-plain-syntax">(</span><span class="Preform-identifier-syntax">phrase_being_compiled</span><span class="Preform-plain-syntax">, </span><span class="Preform-identifier-syntax">W</span><span class="Preform-plain-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">i</span><span class="Preform-plain-syntax"> >= </span><span class="Preform-constant-syntax">0</span><span class="Preform-plain-syntax">) {</span>
|
|
<span class="Preform-plain-syntax"> ==> { -, </span><a href="14-cn.html#SP9" class="function-link"><span class="Preform-function-syntax">Conditions::new_TEST_PHRASE_OPTION</span></a><span class="Preform-plain-syntax">(</span><span class="Preform-identifier-syntax">i</span><span class="Preform-plain-syntax">) };</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-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>
|
|
<p class="commentary firstcommentary"><a id="SP7" class="paragraph-anchor"></a><b>§7. </b>We have already seen action patterns used as nouns; here they are used as
|
|
conditions, so this is where the condition in
|
|
</p>
|
|
|
|
<blockquote>
|
|
<p>if taking the box, ...</p>
|
|
</blockquote>
|
|
|
|
<p class="commentary">is handled. The following nonterminal exists to enter the AP to the meaning list.
|
|
</p>
|
|
|
|
<pre class="Preform-displayed-code all-displayed-code code-font">
|
|
<span class="Preform-function-syntax"><s-action-pattern-as-condition></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">::=</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><we-are-action-pattern></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> { -, Conditions::new_TEST_ACTION(RP[1], W) }</span>
|
|
|
|
<span class="Preform-function-syntax"><s-action-pattern-as-negated-condition></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">::=</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><action-pattern-negated></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> { -, Conditions::new_TEST_ACTION(RP[1], W) }</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This is <a href="../words-module/4-ap.html" class="internal">Preform grammar</a>, not regular C code.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP8" class="paragraph-anchor"></a><b>§8. </b>And similarly:
|
|
</p>
|
|
|
|
<pre class="Preform-displayed-code all-displayed-code code-font">
|
|
<span class="Preform-function-syntax"><s-past-action-pattern-as-condition></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">::=</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><action-pattern-past></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="10-cap.html#SP8_1" class="named-paragraph-link"><span class="named-paragraph">Convert stored past action pattern to condition node</span><span class="named-paragraph-number">8.1</span></a></span>
|
|
|
|
<span class="Preform-function-syntax"><s-past-action-pattern-as-negated-condition></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">::=</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><action-pattern-past-negated></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="10-cap.html#SP8_1" class="named-paragraph-link"><span class="named-paragraph">Convert stored past action pattern to condition node</span><span class="named-paragraph-number">8.1</span></a></span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This is <a href="../words-module/4-ap.html" class="internal">Preform grammar</a>, not regular C code.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP8_1" class="paragraph-anchor"></a><b>§8.1. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Convert stored past action pattern to condition node</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="identifier-syntax">ifdef</span><span class="plain-syntax"> </span><span class="identifier-syntax">IF_MODULE</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">action_pattern</span><span class="plain-syntax"> *</span><span class="identifier-syntax">ap</span><span class="plain-syntax"> = </span><span class="identifier-syntax">RP</span><span class="plain-syntax">[1];</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">PL::Actions::Patterns::makes_callings</span><span class="plain-syntax">(</span><span class="identifier-syntax">ap</span><span class="plain-syntax">)) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">StandardProblems::sentence_problem</span><span class="plain-syntax">(</span><a href="1-wtc.html#SP6" class="function-link"><span class="function-syntax">Task::syntax_tree</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_PastActionCalled</span><span class="plain-syntax">),</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"a description of an action cannot both refer to past "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"history and also use '(called ...)'"</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"because that would require Inform in general to remember "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"too much information about past events."</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">C</span><span class="plain-syntax"> = </span><a href="14-cn.html#SP10" class="function-link"><span class="function-syntax">Conditions::new_TEST_ACTION</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>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">C</span><span class="plain-syntax"> = </span><a href="14-cn.html#SP11" class="function-link"><span class="function-syntax">Conditions::attach_tense</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">C</span><span class="plain-syntax">, </span><span class="identifier-syntax">HASBEEN_TENSE</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> ==> { -, </span><span class="identifier-syntax">C</span><span class="plain-syntax"> };</span>
|
|
<span class="plain-syntax"> #</span><span class="identifier-syntax">endif</span>
|
|
<span class="plain-syntax"> #</span><span class="identifier-syntax">ifndef</span><span class="plain-syntax"> </span><span class="identifier-syntax">IF_MODULE</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> #</span><span class="identifier-syntax">endif</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="10-cap.html#SP8">§8</a> (twice).</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP9" class="paragraph-anchor"></a><b>§9. Command phrases. </b>The final clutch of nonterminals in the S-grammar handles individual commands,
|
|
written in their semicolon-divided list in the body of a rule or "To..."
|
|
definition. For instance, in the not very sensible rule:
|
|
</p>
|
|
|
|
<blockquote>
|
|
<p>Instead of jumping: now the score is 10; say "Greetings!" instead.</p>
|
|
</blockquote>
|
|
|
|
<p class="commentary">Inform will use <s-command> to parse the text of the two commands in the rule
|
|
body. <s-command> parses the text with little attempt to judge whether the
|
|
parameters of the phrase match; it simply records possibilities for
|
|
typechecking to choose between much later on.
|
|
</p>
|
|
|
|
<pre class="Preform-displayed-code all-displayed-code code-font">
|
|
<span class="Preform-function-syntax"><s-command></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-function-syntax"><s-command></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"> { pass 1 }</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-to-phrase></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> { pass 1 }</span>
|
|
|
|
<span class="Preform-function-syntax"><s-say-command></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-function-syntax"><s-say-command></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"> { pass 1 }</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-adaptive-text></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"> { pass 1 }</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-text-substitution></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> { pass 1 }</span>
|
|
|
|
<span class="Preform-function-syntax"><s-adaptive-text></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">::=</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-local-variable></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"> { fail }</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><adaptive-verb></span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">verb</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"> { -, ExParser::say_verb(RP[1], R[1], NULL, W) }</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><adaptive-adjective></span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">adjective</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"> { -, ExParser::say_adjective(RP[1], W) }</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><adaptive-verb></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"> { -, ExParser::say_verb(RP[1], R[1], NULL, W) }</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><modal-verb></span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><adaptive-verb-infinitive></span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">verb</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="10-cap.html#SP9_3" class="named-paragraph-link"><span class="named-paragraph">Annotate the verb with a modal</span><span class="named-paragraph-number">9.3</span></a></span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><modal-verb></span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><adaptive-verb-infinitive></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="10-cap.html#SP9_3" class="named-paragraph-link"><span class="named-paragraph">Annotate the verb with a modal</span><span class="named-paragraph-number">9.3</span></a></span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><adaptive-adjective></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> { -, ExParser::say_adjective(RP[1], W) }</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This is <a href="../words-module/4-ap.html" class="internal">Preform grammar</a>, not regular C code.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP9_1" class="paragraph-anchor"></a><b>§9.1. </b>"To..." phrases are easy, or at least, easy to delegate:
|
|
</p>
|
|
|
|
<pre class="Preform-displayed-code all-displayed-code code-font">
|
|
<span class="Preform-function-syntax"><s-to-phrase></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>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">parse_node</span><span class="Preform-plain-syntax"> *</span><span class="Preform-identifier-syntax">p</span><span class="Preform-plain-syntax"> = </span><span class="Preform-identifier-syntax">Lexicon::retrieve</span><span class="Preform-plain-syntax">(</span><span class="Preform-constant-syntax">VOID_PHRASE_MC</span><span class="Preform-plain-syntax">, </span><span class="Preform-identifier-syntax">W</span><span class="Preform-plain-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">p</span><span class="Preform-plain-syntax">) {</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">parse_node</span><span class="Preform-plain-syntax"> *</span><span class="Preform-identifier-syntax">spec</span><span class="Preform-plain-syntax"> = </span><span class="Preform-identifier-syntax">Node::new_with_words</span><span class="Preform-plain-syntax">(</span><span class="Preform-constant-syntax">PHRASE_TO_DECIDE_VALUE_NT</span><span class="Preform-plain-syntax">, </span><span class="Preform-identifier-syntax">W</span><span class="Preform-plain-syntax">);</span>
|
|
<span class="Preform-plain-syntax"> </span><a href="10-cap.html#SP12" class="function-link"><span class="Preform-function-syntax">ExParser::add_ilist</span></a><span class="Preform-plain-syntax">(</span><span class="Preform-identifier-syntax">spec</span><span class="Preform-plain-syntax">, </span><span class="Preform-identifier-syntax">p</span><span class="Preform-plain-syntax">);</span>
|
|
<span class="Preform-plain-syntax"> ==> { -, </span><span class="Preform-identifier-syntax">spec</span><span class="Preform-plain-syntax"> };</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-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>
|
|
<p class="commentary firstcommentary"><a id="SP9_2" class="paragraph-anchor"></a><b>§9.2. </b></p>
|
|
|
|
<pre class="Preform-displayed-code all-displayed-code code-font">
|
|
<span class="Preform-function-syntax"><s-text-substitution></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>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">parse_node</span><span class="Preform-plain-syntax"> *</span><span class="Preform-identifier-syntax">p</span><span class="Preform-plain-syntax"> = </span><span class="Preform-identifier-syntax">Lexicon::retrieve</span><span class="Preform-plain-syntax">(</span><span class="Preform-constant-syntax">SAY_PHRASE_MC</span><span class="Preform-plain-syntax">, </span><span class="Preform-identifier-syntax">W</span><span class="Preform-plain-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">p</span><span class="Preform-plain-syntax">) {</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">parse_node</span><span class="Preform-plain-syntax"> *</span><span class="Preform-identifier-syntax">spec</span><span class="Preform-plain-syntax"> = </span><span class="Preform-identifier-syntax">Node::new_with_words</span><span class="Preform-plain-syntax">(</span><span class="Preform-constant-syntax">PHRASE_TO_DECIDE_VALUE_NT</span><span class="Preform-plain-syntax">, </span><span class="Preform-identifier-syntax">W</span><span class="Preform-plain-syntax">);</span>
|
|
<span class="Preform-plain-syntax"> </span><a href="10-cap.html#SP12" class="function-link"><span class="Preform-function-syntax">ExParser::add_ilist</span></a><span class="Preform-plain-syntax">(</span><span class="Preform-identifier-syntax">spec</span><span class="Preform-plain-syntax">, </span><span class="Preform-identifier-syntax">p</span><span class="Preform-plain-syntax">);</span>
|
|
<span class="Preform-plain-syntax"> ==> { -, </span><span class="Preform-identifier-syntax">spec</span><span class="Preform-plain-syntax"> };</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-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>
|
|
<p class="commentary firstcommentary"><a id="SP9_3" class="paragraph-anchor"></a><b>§9.3. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Annotate the verb with a modal</span><span class="named-paragraph-number">9.3</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">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">neg</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">R</span><span class="plain-syntax">[1]) || (</span><span class="identifier-syntax">R</span><span class="plain-syntax">[2])) </span><span class="identifier-syntax">neg</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> ==> { -, </span><a href="10-cap.html#SP11" class="function-link"><span class="function-syntax">ExParser::say_verb</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">RP</span><span class="plain-syntax">[2], </span><span class="identifier-syntax">neg</span><span class="plain-syntax">, </span><span class="identifier-syntax">RP</span><span class="plain-syntax">[1], </span><span class="identifier-syntax">W</span><span class="plain-syntax">) };</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="10-cap.html#SP9">§9</a> (twice).</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP10" class="paragraph-anchor"></a><b>§10. </b>Invocation nodes for adaptive-text adjectives hold references to their masculine
|
|
singulars.
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="function-syntax">ExParser::say_adjective</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">ExParser::say_adjective</span></span>:<br/><a href="10-cap.html#SP9">§9</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">adjective</span><span class="plain-syntax"> *</span><span class="identifier-syntax">aph</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="plain-syntax"> </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">spec</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Node::new_with_words</span><span class="plain-syntax">(</span><span class="constant-syntax">PHRASE_TO_DECIDE_VALUE_NT</span><span class="plain-syntax">, </span><span class="identifier-syntax">W</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">inv</span><span class="plain-syntax"> = </span><a href="25-in.html#SP8" class="function-link"><span class="function-syntax">Invocations::new</span></a><span class="plain-syntax">();</span>
|
|
<span class="plain-syntax"> </span><a href="25-in.html#SP11" class="function-link"><span class="function-syntax">Invocations::set_word_range</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">inv</span><span class="plain-syntax">, </span><span class="identifier-syntax">W</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="25-in.html#SP13" class="function-link"><span class="function-syntax">Invocations::set_adjective</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">inv</span><span class="plain-syntax">, </span><span class="identifier-syntax">aph</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">spec</span><span class="plain-syntax">-></span><span class="identifier-syntax">down</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Node::new</span><span class="plain-syntax">(</span><span class="identifier-syntax">INVOCATION_LIST_NT</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">spec</span><span class="plain-syntax">-></span><span class="identifier-syntax">down</span><span class="plain-syntax">-></span><span class="element-syntax">down</span><span class="plain-syntax"> = </span><a href="25-in.html#SP22" class="function-link"><span class="function-syntax">Invocations::add_to_list</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">spec</span><span class="plain-syntax">-></span><span class="element-syntax">down</span><span class="plain-syntax">-></span><span class="element-syntax">down</span><span class="plain-syntax">, </span><span class="identifier-syntax">inv</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">spec</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP11" class="paragraph-anchor"></a><b>§11. </b>Invocation nodes for adaptive-text verbs hold references to their first
|
|
person plurals.
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="function-syntax">ExParser::say_verb</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">ExParser::say_verb</span></span>:<br/><a href="10-cap.html#SP9">§9</a>, <a href="10-cap.html#SP9_3">§9.3</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">verb_conjugation</span><span class="plain-syntax"> *</span><span class="identifier-syntax">vc</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">neg</span><span class="plain-syntax">, </span><span class="identifier-syntax">verb_conjugation</span><span class="plain-syntax"> *</span><span class="identifier-syntax">mvc</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="plain-syntax"> </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">spec</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Node::new_with_words</span><span class="plain-syntax">(</span><span class="constant-syntax">PHRASE_TO_DECIDE_VALUE_NT</span><span class="plain-syntax">, </span><span class="identifier-syntax">W</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">inv</span><span class="plain-syntax"> = </span><a href="25-in.html#SP8" class="function-link"><span class="function-syntax">Invocations::new</span></a><span class="plain-syntax">();</span>
|
|
<span class="plain-syntax"> </span><a href="25-in.html#SP11" class="function-link"><span class="function-syntax">Invocations::set_word_range</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">inv</span><span class="plain-syntax">, </span><span class="identifier-syntax">W</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="25-in.html#SP12" class="function-link"><span class="function-syntax">Invocations::set_verb_conjugation</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">inv</span><span class="plain-syntax">, </span><span class="identifier-syntax">vc</span><span class="plain-syntax">, </span><span class="identifier-syntax">mvc</span><span class="plain-syntax">, </span><span class="identifier-syntax">neg</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">spec</span><span class="plain-syntax">-></span><span class="identifier-syntax">down</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Node::new</span><span class="plain-syntax">(</span><span class="identifier-syntax">INVOCATION_LIST_NT</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">spec</span><span class="plain-syntax">-></span><span class="identifier-syntax">down</span><span class="plain-syntax">-></span><span class="element-syntax">down</span><span class="plain-syntax"> = </span><a href="25-in.html#SP22" class="function-link"><span class="function-syntax">Invocations::add_to_list</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">spec</span><span class="plain-syntax">-></span><span class="element-syntax">down</span><span class="plain-syntax">-></span><span class="element-syntax">down</span><span class="plain-syntax">, </span><span class="identifier-syntax">inv</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">spec</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP12" class="paragraph-anchor"></a><b>§12. </b>There are three basic kinds of phrase: those used as commands
|
|
(i.e., void procedures in C terms), those used as values (returning values
|
|
other than true/false) and those used as conditions (returning true or false).
|
|
These are stored in a way making basically the same use of a specification's
|
|
references, so all three are handled by the following code.
|
|
</p>
|
|
|
|
<p class="commentary">The usage of a phrase is called an "invocation" of it, and sometimes more than
|
|
one invocation appears, for two reasons: a "say" phrase can contain a sequence
|
|
of invocations to follow, one after another; and sometimes it will only be clear
|
|
at run-time which of several possible definitions is to apply, so the
|
|
possibilities will all be invoked.
|
|
</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">ExParser::add_ilist</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">ExParser::add_ilist</span></span>:<br/><a href="10-cap.html#SP5">§5</a>, <a href="10-cap.html#SP9_1">§9.1</a>, <a href="10-cap.html#SP9_2">§9.2</a><br/>Type Expressions and Values - <a href="10-teav.html#SP19">§19</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">spec</span><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="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="10-cap.html#SP12_1" class="named-paragraph-link"><span class="named-paragraph">Build the invocation list</span><span class="named-paragraph-number">12.1</span></a></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">len</span><span class="plain-syntax"> = </span><a href="25-in.html#SP23" class="function-link"><span class="function-syntax">Invocations::length_of_list</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">spec</span><span class="plain-syntax">-></span><span class="element-syntax">down</span><span class="plain-syntax">-></span><span class="element-syntax">down</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">len</span><span class="plain-syntax"> >= </span><span class="constant-syntax">MAX_INVOCATIONS_PER_PHRASE</span><span class="plain-syntax">)</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="10-cap.html#SP12_2" class="named-paragraph-link"><span class="named-paragraph">Issue overcomplicated phrase problem message</span><span class="named-paragraph-number">12.2</span></a></span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">len</span><span class="plain-syntax"> > </span><span class="constant-syntax">0</span><span class="plain-syntax">)</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">spec</span><span class="plain-syntax">-></span><span class="element-syntax">down</span><span class="plain-syntax">-></span><span class="element-syntax">down</span><span class="plain-syntax"> = </span><a href="25-in.html#SP25" class="function-link"><span class="function-syntax">Invocations::sort_list</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">spec</span><span class="plain-syntax">-></span><span class="element-syntax">down</span><span class="plain-syntax">-></span><span class="element-syntax">down</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP12_1" class="paragraph-anchor"></a><b>§12.1. </b>There are multiple invocations, each produced from another node in the
|
|
S-tree as we run sideways through the alternative readings.
|
|
</p>
|
|
|
|
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Build the invocation list</span><span class="named-paragraph-number">12.1</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (; </span><span class="identifier-syntax">p</span><span class="plain-syntax">; </span><span class="identifier-syntax">p</span><span class="plain-syntax"> = </span><span class="identifier-syntax">p</span><span class="plain-syntax">-></span><span class="identifier-syntax">next_alternative</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">phrase</span><span class="plain-syntax"> *</span><span class="identifier-syntax">ph</span><span class="plain-syntax"> = </span><span class="identifier-syntax">RETRIEVE_POINTER_phrase</span><span class="plain-syntax">(</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Lexicon::get_data</span><span class="plain-syntax">(</span><span class="identifier-syntax">Node::get_meaning</span><span class="plain-syntax">(</span><span class="identifier-syntax">p</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">inv</span><span class="plain-syntax"> = </span><a href="25-pi.html#SP4" class="function-link"><span class="function-syntax">Phrases::Parser::parse_against</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">ph</span><span class="plain-syntax">, </span><span class="identifier-syntax">p</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><a href="22-ptd.html#SP21" class="function-link"><span class="function-syntax">Phrases::TypeData::is_the_primordial_say</span></a><span class="plain-syntax">(&(</span><span class="identifier-syntax">ph</span><span class="plain-syntax">-></span><span class="element-syntax">type_data</span><span class="plain-syntax">)) == </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">) &&</span>
|
|
<span class="plain-syntax"> (</span><a href="14-rv.html#SP19" class="function-link"><span class="function-syntax">Rvalues::is_CONSTANT_of_kind</span></a><span class="plain-syntax">(</span>
|
|
<span class="plain-syntax"> </span><a href="25-in.html#SP16" class="function-link"><span class="function-syntax">Invocations::get_token_as_parsed</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">inv</span><span class="plain-syntax">, </span><span class="constant-syntax">0</span><span class="plain-syntax">), </span><span class="identifier-syntax">K_text</span><span class="plain-syntax">)))</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">continue</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">spec</span><span class="plain-syntax">-></span><span class="element-syntax">down</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">spec</span><span class="plain-syntax">-></span><span class="element-syntax">down</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Node::new</span><span class="plain-syntax">(</span><span class="identifier-syntax">INVOCATION_LIST_NT</span><span class="plain-syntax">);</span>
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|
<span class="plain-syntax"> </span><span class="identifier-syntax">Node::set_text</span><span class="plain-syntax">(</span><span class="identifier-syntax">spec</span><span class="plain-syntax">-></span><span class="identifier-syntax">down</span><span class="plain-syntax">, </span><span class="identifier-syntax">Node::get_text</span><span class="plain-syntax">(</span><span class="identifier-syntax">spec</span><span class="plain-syntax">));</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">spec</span><span class="plain-syntax">-></span><span class="element-syntax">down</span><span class="plain-syntax">-></span><span class="element-syntax">down</span><span class="plain-syntax"> = </span><a href="25-in.html#SP22" class="function-link"><span class="function-syntax">Invocations::add_to_list</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">spec</span><span class="plain-syntax">-></span><span class="element-syntax">down</span><span class="plain-syntax">-></span><span class="element-syntax">down</span><span class="plain-syntax">, </span><span class="identifier-syntax">inv</span><span class="plain-syntax">);</span>
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|
<span class="plain-syntax"> }</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="10-cap.html#SP12">§12</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP12_2" class="paragraph-anchor"></a><b>§12.2. </b>This problem used to be experienced for long say phrases in a situation
|
|
where many kinds of value have been created, so that "say V" for a value V
|
|
was heavily ambiguous — pumping up the number of invocations generated. In
|
|
2010, the introduction of generics into Inform made it possible to define
|
|
"say V" just once, and after that it became so difficult to reach this
|
|
limit that we were unable to construct a test case for it.
|
|
</p>
|
|
|
|
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Issue overcomplicated phrase problem message</span><span class="named-paragraph-number">12.2</span></span><span class="comment-syntax"> =</span>
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|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">spec</span><span class="plain-syntax">-></span><span class="identifier-syntax">down</span><span class="plain-syntax">-></span><span class="element-syntax">down</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><span class="comment-syntax"> truncate to just one</span>
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|
<span class="plain-syntax"> </span><span class="identifier-syntax">Node::set_text</span><span class="plain-syntax">(</span><span class="identifier-syntax">spec</span><span class="plain-syntax">, </span><span class="identifier-syntax">Node::get_text</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">Problems::quote_source</span><span class="plain-syntax">(1, </span><span class="identifier-syntax">current_sentence</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">StandardProblems::handmade_problem</span><span class="plain-syntax">(</span><a href="1-wtc.html#SP6" class="function-link"><span class="function-syntax">Task::syntax_tree</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">BelievedImpossible</span><span class="plain-syntax">));</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::issue_problem_segment</span><span class="plain-syntax">(</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"In %1, the phrase being constructed is just too "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"long and complicated, and will need to be simplified. (This "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"sometimes happens with a 'say', or a piece of text, containing "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"many text substitutions in succession: if so, it may be worth "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"defining some more powerful text substitutions - for instance "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"writing 'To say super-duper: ...', giving the gory details, "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"and then using the single substitution '[super-duper]' in the "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"original phrase."</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::issue_problem_end</span><span class="plain-syntax">();</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="10-cap.html#SP12">§12</a>.</li></ul>
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