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<!--Weave of 'Type Expressions and Values' generated by Inweb-->
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<div class="breadcrumbs">
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<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../compiler.html">Inform7</a></li><li><a href="index.html">values</a></li><li><a href="index.html#4">Chapter 4: The S-Parser</a></li><li><b>Type Expressions and Values</b></li></ul></div>
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<p class="purpose">To parse two forms of noun: a noun phrase in a sentence, and a description of what text can be written in a given situation.</p>
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<ul class="toc"><li><a href="4-teav.html#SP2">§2. Type expressions</a></li><li><a href="4-teav.html#SP5">§5. Unusual contexts</a></li><li><a href="4-teav.html#SP9">§9. Values</a></li><li><a href="4-teav.html#SP13">§13. Variables</a></li><li><a href="4-teav.html#SP20">§20. Table references</a></li></ul><hr class="tocbar">
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. </b>Inform recognises many noun-like constructions, some of which — out of a noun
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context — look like adjectives, actions or other excerpts which aren't at all
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evidently nouns. These many ways to describe nouns are gathered up into two
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central constructions. A "type expression" specifies what sort of excerpt
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should appear in a given place, whereas a "value" means anything which
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can be a noun phrase for a verb. There is considerable overlap between the
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two, but they are not the same.
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</p>
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<p class="commentary">The following example sentences all have expressions embedded in them:
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="plain-syntax"> </span><span class="identifier-syntax">EXPRESSION</span><span class="plain-syntax">:</span>
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<span class="identifier-syntax">if</span><span class="plain-syntax"> </span><span class="identifier-syntax">the</span><span class="plain-syntax"> </span><span class="identifier-syntax">idea</span><span class="plain-syntax"> </span><span class="identifier-syntax">of</span><span class="plain-syntax"> </span><span class="identifier-syntax">the</span><span class="plain-syntax"> </span><span class="identifier-syntax">gizmo</span><span class="plain-syntax"> </span><span class="identifier-syntax">is</span><span class="plain-syntax"> </span><span class="identifier-syntax">taking</span><span class="plain-syntax"> </span><span class="identifier-syntax">the</span><span class="plain-syntax"> </span><span class="identifier-syntax">fish</span><span class="plain-syntax"> , ...</span>
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<span class="identifier-syntax">if</span><span class="plain-syntax"> </span><span class="identifier-syntax">there</span><span class="plain-syntax"> </span><span class="identifier-syntax">are</span><span class="plain-syntax"> </span><span class="identifier-syntax">three</span><span class="plain-syntax"> </span><span class="identifier-syntax">women</span><span class="plain-syntax"> </span><span class="identifier-syntax">in</span><span class="plain-syntax"> </span><span class="identifier-syntax">the</span><span class="plain-syntax"> </span><span class="identifier-syntax">Nunnery</span><span class="plain-syntax">, ...</span>
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<span class="identifier-syntax">Before</span><span class="plain-syntax"> </span><span class="identifier-syntax">taking</span><span class="plain-syntax"> </span><span class="identifier-syntax">the</span><span class="plain-syntax"> </span><span class="identifier-syntax">harmonium</span><span class="plain-syntax"> , ...</span>
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<span class="identifier-syntax">let</span><span class="plain-syntax"> </span><span class="identifier-syntax">X</span><span class="plain-syntax"> </span><span class="identifier-syntax">be</span><span class="plain-syntax"> </span><span class="identifier-syntax">the</span><span class="plain-syntax"> </span><span class="identifier-syntax">harmonium</span>
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<span class="identifier-syntax">now</span><span class="plain-syntax"> </span><span class="identifier-syntax">Y</span><span class="plain-syntax"> </span><span class="identifier-syntax">is</span><span class="plain-syntax"> </span><span class="identifier-syntax">the</span><span class="plain-syntax"> </span><span class="identifier-syntax">start</span><span class="plain-syntax"> </span><span class="identifier-syntax">timers</span><span class="plain-syntax"> </span><span class="identifier-syntax">rule</span>
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<span class="identifier-syntax">now</span><span class="plain-syntax"> </span><span class="identifier-syntax">Z</span><span class="plain-syntax"> </span><span class="identifier-syntax">is</span><span class="plain-syntax"> </span><span class="identifier-syntax">the</span><span class="plain-syntax"> </span><span class="identifier-syntax">time</span><span class="plain-syntax"> </span><span class="identifier-syntax">of</span><span class="plain-syntax"> </span><span class="identifier-syntax">day</span>
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<span class="identifier-syntax">let</span><span class="plain-syntax"> </span><span class="identifier-syntax">N</span><span class="plain-syntax"> </span><span class="identifier-syntax">be</span><span class="plain-syntax"> </span><span class="identifier-syntax">the</span><span class="plain-syntax"> </span><span class="identifier-syntax">number</span><span class="plain-syntax"> </span><span class="identifier-syntax">of</span><span class="plain-syntax"> </span><span class="identifier-syntax">entries</span><span class="plain-syntax"> </span><span class="identifier-syntax">in</span><span class="plain-syntax"> </span><span class="identifier-syntax">L</span>
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<span class="identifier-syntax">Understand</span><span class="plain-syntax"> </span><span class="string-syntax">"turn to [ number ]"</span><span class="plain-syntax"> </span><span class="identifier-syntax">as</span><span class="plain-syntax"> </span><span class="identifier-syntax">combination</span><span class="plain-syntax">-</span><span class="identifier-syntax">setting</span><span class="plain-syntax">.</span>
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<span class="identifier-syntax">To</span><span class="plain-syntax"> </span><span class="identifier-syntax">repeat</span><span class="plain-syntax"> </span><span class="identifier-syntax">until</span><span class="plain-syntax"> (</span><span class="identifier-syntax">C</span><span class="plain-syntax"> - </span><span class="identifier-syntax">condition</span><span class="plain-syntax"> ): ...</span>
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<span class="identifier-syntax">The</span><span class="plain-syntax"> </span><span class="identifier-syntax">Zeppelin</span><span class="plain-syntax"> </span><span class="identifier-syntax">countdown</span><span class="plain-syntax"> </span><span class="identifier-syntax">is</span><span class="plain-syntax"> </span><span class="identifier-syntax">a</span><span class="plain-syntax"> </span><span class="identifier-syntax">number</span><span class="plain-syntax"> </span><span class="identifier-syntax">that</span><span class="plain-syntax"> </span><span class="identifier-syntax">varies</span>
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<span class="identifier-syntax">The</span><span class="plain-syntax"> </span><span class="identifier-syntax">little</span><span class="plain-syntax"> </span><span class="identifier-syntax">red</span><span class="plain-syntax"> </span><span class="identifier-syntax">car</span><span class="plain-syntax"> </span><span class="identifier-syntax">is</span><span class="plain-syntax"> </span><span class="identifier-syntax">a</span><span class="plain-syntax"> </span><span class="identifier-syntax">vehicle</span>
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<span class="identifier-syntax">The</span><span class="plain-syntax"> </span><span class="identifier-syntax">weight</span><span class="plain-syntax"> </span><span class="identifier-syntax">of</span><span class="plain-syntax"> </span><span class="identifier-syntax">the</span><span class="plain-syntax"> </span><span class="identifier-syntax">Space</span><span class="plain-syntax"> </span><span class="identifier-syntax">Shuttle</span><span class="plain-syntax"> </span><span class="identifier-syntax">is</span><span class="plain-syntax"> </span><span class="constant-syntax">68585</span><span class="plain-syntax"> </span><span class="identifier-syntax">kg</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>§2. Type expressions. </b>A "type expression" specifies what sort of excerpt of text should appear
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in a given context. Sometimes it asks for a particular value, sometimes any
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value matching a given description.
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</p>
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<p class="commentary">This is a concept which does not exist for conventional programming languages,
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which would see it as a sort of half-way position between "value" and
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"type". In particular, a "type expression" is used to lay out what a
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parameter in a phrase definition should be, though it has other uses elsewhere.
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That certainly includes cases which traditional programming languages would
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call types, so
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</p>
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<blockquote>
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<p>To adjust (X - closed door) by (N - number): ...</p>
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</blockquote>
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<p class="commentary">includes two type expressions, "closed door" and "number". But a type
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expression can also be a constant, which languages like C (for instance) would
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consider a value and not a type at all:
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</p>
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<blockquote>
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<p>To adjust (X - closed door) by (N - 11): ...</p>
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</blockquote>
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<p class="commentary">gives a definition to be used only where the second parameter evaluates to
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11. In this way any constant value is regarded as being a type — the narrow
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type representing only its own value.
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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-type-expression-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"><article></span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-type-expression-unarticled></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 2 }</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-type-expression-unarticled></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-function-syntax"><s-type-expression-unarticled></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-variable-scope></span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">variable/variables</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-variable-scope></span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">that/which</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">vary/varies</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"><k-kind></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"> { -, Specifications::from_kind(RP[1]) }</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-literal></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-constant-value></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-desc-uncomposite></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-value></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-description></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>Note that a list of adjectives with no noun does not qualify as a type
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expression. It looks as if it never should, on the face of it — "opaque"
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does not make clear what kind of object is to be opaque — but once again we
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are up against the problem that Inform needs to allow some slightly noun-like
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adjectives. For instance, this:
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</p>
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<blockquote>
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<p>To adjust (X - scenery): ...</p>
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</blockquote>
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<p class="commentary">is allowed even though "scenery" is an adjective in Inform.
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</p>
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<p class="commentary">To allow this, we have a minor variation:
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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-descriptive-type-expression-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"><article></span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-descriptive-type-expression-unarticled></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 2 }</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-descriptive-type-expression-unarticled></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-function-syntax"><s-descriptive-type-expression-unarticled></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-adjective-list-as-desc></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-type-expression-unarticled></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="SP4" class="paragraph-anchor"></a><b>§4. </b>And now we parse descriptions of variables such as the one appearing in
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</p>
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<blockquote>
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<p>To increment (V - existing number variable)</p>
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</blockquote>
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<p class="commentary">where <s-variable-scope> matches "existing number variable".
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</p>
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<p class="commentary">Note that these forms recurse, so that syntactically we allow "T that
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varies" for any type expression T. This would include contradictions in terms
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such as "15 that varies" or "number that varies that varies that varies",
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but we want to allow the parse here so that a problem message can be issued
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higher up in Inform. Ultimately, the text must match <k-kind> in each case.
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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-variable-scope></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">::=</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">global</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"> { -, Specifications::new_new_variable_like(NULL) }</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">global</span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-variable-contents></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-variable-contents></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-function-syntax"><s-variable-contents></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"><k-kind></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"> { -, Specifications::new_new_variable_like(RP[1]) }</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-literal></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="4-teav.html#SP4_1" class="named-paragraph-link"><span class="named-paragraph">Issue PM_TypeCantVary problem</span><span class="named-paragraph-number">4.1</span></a></span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-constant-value></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="4-teav.html#SP4_1" class="named-paragraph-link"><span class="named-paragraph">Issue PM_TypeCantVary problem</span><span class="named-paragraph-number">4.1</span></a></span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-desc-uncomposite></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="4-teav.html#SP4_2" class="named-paragraph-link"><span class="named-paragraph">Issue PM_TypeUnmaintainable problem</span><span class="named-paragraph-number">4.2</span></a></span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-description></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="4-teav.html#SP4_2" class="named-paragraph-link"><span class="named-paragraph">Issue PM_TypeUnmaintainable problem</span><span class="named-paragraph-number">4.2</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="SP4_1" class="paragraph-anchor"></a><b>§4.1. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Issue PM_TypeCantVary problem</span><span class="named-paragraph-number">4.1</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">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">Problems::quote_wording</span><span class="plain-syntax">(2, </span><span class="identifier-syntax">W</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">StandardProblems::handmade_problem</span><span class="plain-syntax">(</span><span class="identifier-syntax">Task::syntax_tree</span><span class="plain-syntax">(), </span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_TypeCantVary</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, '%2' is not a kind of value which a variable can safely have, "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"as it cannot ever vary."</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>
|
|
<span class="plain-syntax"> ==> { -, </span><a href="2-spc.html#SP6" class="function-link"><span class="function-syntax">Specifications::new_new_variable_like</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">K_object</span><span class="plain-syntax">) };</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="4-teav.html#SP4">§4</a> (twice).</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP4_2" class="paragraph-anchor"></a><b>§4.2. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Issue PM_TypeUnmaintainable problem</span><span class="named-paragraph-number">4.2</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="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">Problems::quote_wording</span><span class="plain-syntax">(2, </span><span class="identifier-syntax">W</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">StandardProblems::handmade_problem</span><span class="plain-syntax">(</span><span class="identifier-syntax">Task::syntax_tree</span><span class="plain-syntax">(), </span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_TypeUnmaintainable</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, '%2' is not a kind of value which a variable can safely have, "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"as it cannot be guaranteed that the contents will always meet "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"this criterion."</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>
|
|
<span class="plain-syntax"> ==> { -, </span><a href="2-spc.html#SP6" class="function-link"><span class="function-syntax">Specifications::new_new_variable_like</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">K_object</span><span class="plain-syntax">) };</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="4-teav.html#SP4">§4</a> (twice).</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP5" class="paragraph-anchor"></a><b>§5. Unusual contexts. </b>Two pieces of context. "Let" mode is in operation when we are in an equation
|
|
written out in the phrase, such as here:
|
|
</p>
|
|
|
|
<blockquote>
|
|
<p>let V be given by V = fl;</p>
|
|
</blockquote>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">let_equation_mode</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">probable_noun_phrase_context</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP6" class="paragraph-anchor"></a><b>§6. </b>As mentioned earlier, this changes our conventions on word-breaking.
|
|
</p>
|
|
|
|
<pre class="Preform-displayed-code all-displayed-code code-font">
|
|
<span class="Preform-function-syntax"><if-let-equation-mode></span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">internal</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">0</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">{</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">if</span><span class="Preform-plain-syntax"> (</span><span class="Preform-identifier-syntax">let_equation_mode</span><span class="Preform-plain-syntax">) </span><span class="Preform-reserved-syntax">return</span><span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">TRUE</span><span class="Preform-plain-syntax">;</span>
|
|
<span class="Preform-plain-syntax"> ==> { </span><span class="Preform-identifier-syntax">fail</span><span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">nonterminal</span><span class="Preform-plain-syntax"> };</span>
|
|
<span class="Preform-plain-syntax">}</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This is <a href="../words-module/4-ap.html" class="internal">Preform grammar</a>, not regular C code.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP7" class="paragraph-anchor"></a><b>§7. </b>Next, we are sometimes in a situation where a local variable exists which
|
|
can be referred to by a pronoun like "it"; if so, we will enable the use
|
|
of possessives like "its" to refer to properties.
|
|
</p>
|
|
|
|
<pre class="Preform-displayed-code all-displayed-code code-font">
|
|
<span class="Preform-function-syntax"><if-pronoun-present></span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">internal</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">0</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">{</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">if</span><span class="Preform-plain-syntax"> (</span><span class="Preform-identifier-syntax">Frames::is_its_enabled</span><span class="Preform-plain-syntax">(</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">Frames::current_stack_frame</span><span class="Preform-plain-syntax">())) </span><span class="Preform-reserved-syntax">return</span><span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">TRUE</span><span class="Preform-plain-syntax">;</span>
|
|
<span class="Preform-plain-syntax"> ==> { </span><span class="Preform-identifier-syntax">fail</span><span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">nonterminal</span><span class="Preform-plain-syntax"> };</span>
|
|
<span class="Preform-plain-syntax">}</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This is <a href="../words-module/4-ap.html" class="internal">Preform grammar</a>, not regular C code.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP8" class="paragraph-anchor"></a><b>§8. </b>The other possible contexts are where we are expecting a table column or
|
|
a property name. This enables us to resolve ambiguities in a helpful way,
|
|
but otherwise changes little.
|
|
</p>
|
|
|
|
<pre class="Preform-displayed-code all-displayed-code code-font">
|
|
<span class="Preform-function-syntax"><if-table-column-expected></span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">internal</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">0</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">{</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">if</span><span class="Preform-plain-syntax"> (</span><span class="Preform-identifier-syntax">Kinds::get_construct</span><span class="Preform-plain-syntax">(</span><span class="Preform-identifier-syntax">probable_noun_phrase_context</span><span class="Preform-plain-syntax">) == </span><span class="Preform-identifier-syntax">CON_table_column</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-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>
|
|
|
|
<span class="Preform-function-syntax"><if-property-name-expected></span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">internal</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">0</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">{</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">if</span><span class="Preform-plain-syntax"> (</span><span class="Preform-identifier-syntax">Kinds::get_construct</span><span class="Preform-plain-syntax">(</span><span class="Preform-identifier-syntax">probable_noun_phrase_context</span><span class="Preform-plain-syntax">) == </span><span class="Preform-identifier-syntax">CON_property</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-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" class="paragraph-anchor"></a><b>§9. Values. </b>The sequence here is important, in that it resolves ambiguities:
|
|
</p>
|
|
|
|
<ul class="items"><li>● Variable names have highest priority, in order to allow temporary "let"
|
|
names to mask existing meanings.
|
|
</li><li>● Constants come next: these include literals, but also named constants,
|
|
such as names of rooms or things.
|
|
</li><li>● Equations are an oddball exceptional case, seldom arising.
|
|
</li><li>● Property names are not constants and, as values, they are usually read
|
|
as implicitly referring to a property value of something, not as a reference
|
|
to the property itself: thus "description" means the actual description of
|
|
some object clear from context, not the description property in the abstract.
|
|
</li><li>● Table column names present a particular ambiguity arising from tables
|
|
which are used to construct instances. In tables like that, the column names
|
|
become names of properties owned by those instances; and then there are also
|
|
ambiguities like those with property names, as between the column's identity
|
|
and the actual contents of the current row.
|
|
</li><li>● Phrases to decide a value whose wording mimics a property cause trouble.
|
|
I sometimes think it would be better to penalise this sort of wording by
|
|
treating it badly, but since the Standard Rules are as guilty as anyone else,
|
|
Inform instead tries to cope. Here we parse any phrase whose wording doesn't
|
|
look like a property lookup in the form "X of Y"; later we will pick up
|
|
any phrase whose wording does.
|
|
</li><li>● Similarly we parse descriptions in two rounds: those referring to
|
|
physical objects, and others later on. This is because English tends to give
|
|
metaphorically physical names to abstract things: for example, the word
|
|
"table" for an array of data. We want to make sure sentences like "The
|
|
ball is on the table" are not misread through parsing "table" as the
|
|
name of the kind. (Type expressions have the opposite convention: there,
|
|
kind names always take priority over mere names of things. See above.)
|
|
</li><li>● The "member of..." productions are to make it possible to write
|
|
description comprehensions without ambiguity or grammatical oddness; for
|
|
instance if a "let" name "D" holds a description, it enables us to
|
|
write "members of D" instead of just "D", making the wording of some
|
|
phrases much more natural. It's the difference between a set and its
|
|
membership, which is to say, not really a difference at all.
|
|
</li></ul>
|
|
<pre class="Preform-displayed-code all-displayed-code code-font">
|
|
<span class="Preform-function-syntax"><s-value-uncached></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-value-uncached></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-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"> { -, SPType::val(RP[1], W) }</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><if-table-column-expected></span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-table-column-name></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> { -, SPType::val(RP[2], W) }</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><if-property-name-expected></span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-property-name></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> { -, SPType::val(RP[2], W) }</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-constant-value></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"> { -, SPType::val(RP[1], W) }</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-equation-usage></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-property-name></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> { -, SPType::val(RP[1], W) }</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-action-pattern-as-value></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"> { -, SPType::val(RP[1], W) }</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-value-phrase-non-of></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"> { -, SPType::val(RP[1], W) }</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-adjective-list-as-desc></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"> { -, SPType::val(RP[1], W) }</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-purely-physical-description></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"> { -, SPType::val(RP[1], W) }</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-table-reference></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"> { -, SPType::val(RP[1], W) }</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">member/members</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">of</span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-description></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"> { -, SPType::val(RP[1], W) }</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">member/members</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">of</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"> { -, SPType::val(RP[1], W) }</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-property-name></span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">of</span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-value-uncached></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="4-teav.html#SP9_2" class="named-paragraph-link"><span class="named-paragraph">Belonging-to-V prop</span><span class="named-paragraph-number">9.2</span></a></span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><if-pronoun-present></span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><possessive-third-person></span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-property-name></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="4-teav.html#SP9_1" class="named-paragraph-link"><span class="named-paragraph">Belonging-to-it prop</span><span class="named-paragraph-number">9.1</span></a></span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">entry</span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-value-uncached></span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">of/in/from</span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-value-uncached></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="4-teav.html#SP9_3" class="named-paragraph-link"><span class="named-paragraph">Make a list entry</span><span class="named-paragraph-number">9.3</span></a></span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-description></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"> { -, SPType::val(RP[1], W) }</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-table-column-name></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> { -, SPType::val(RP[1], W) }</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-value-phrase></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> { -, SPType::val(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="SP10" class="paragraph-anchor"></a><b>§10. </b></p>
|
|
|
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<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">SPType::val</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">SPType::val</span></span>:<br/><a href="4-teav.html#SP9">§9</a>, <a href="4-teav.html#SP11_1">§11.1</a>, <a href="4-teav.html#SP11_2">§11.2</a>, <a href="4-teav.html#SP11_3">§11.3</a>, <a href="4-teav.html#SP9_1">§9.1</a>, <a href="4-teav.html#SP9_2">§9.2</a>, <a href="4-teav.html#SP9_3">§9.3</a>, <a href="4-teav.html#SP13">§13</a><br/>Verbal and Relative Clauses - <a href="4-varc.html#SP4">§4</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">v</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">Node::set_text</span><span class="plain-syntax">(</span><span class="identifier-syntax">v</span><span class="plain-syntax">, </span><span class="identifier-syntax">W</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">v</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></p>
|
|
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|
<pre class="Preform-displayed-code all-displayed-code code-font">
|
|
<span class="Preform-function-syntax"><s-equation-usage></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">::=</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><if-let-equation-mode></span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-plain-text-with-equals></span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">where</span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-plain-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"> </span><span class="named-paragraph-container code-font"><a href="4-teav.html#SP11_1" class="named-paragraph-link"><span class="named-paragraph">An equation</span><span class="named-paragraph-number">11.1</span></a></span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-value-uncached></span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">where</span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-plain-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"> </span><span class="named-paragraph-container code-font"><a href="4-teav.html#SP11_2" class="named-paragraph-link"><span class="named-paragraph">An equation, if kinds are right</span><span class="named-paragraph-number">11.2</span></a></span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><if-let-equation-mode></span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-plain-text-with-equals></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="4-teav.html#SP11_3" class="named-paragraph-link"><span class="named-paragraph">An inline equation</span><span class="named-paragraph-number">11.3</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="SP11_1" class="paragraph-anchor"></a><b>§11.1. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">An equation</span><span class="named-paragraph-number">11.1</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">equation</span><span class="plain-syntax"> *</span><span class="identifier-syntax">eqn</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Equations::new</span><span class="plain-syntax">(</span><span class="identifier-syntax">Node::get_text</span><span class="plain-syntax">((</span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *) </span><span class="identifier-syntax">RP</span><span class="plain-syntax">[2]), </span><span class="identifier-syntax">TRUE</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">eq</span><span class="plain-syntax"> = </span><a href="2-rvl.html#SP2" class="function-link"><span class="function-syntax">Rvalues::from_equation</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">eqn</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Equations::set_wherewithal</span><span class="plain-syntax">(</span><span class="identifier-syntax">eqn</span><span class="plain-syntax">, </span><span class="identifier-syntax">Node::get_text</span><span class="plain-syntax">((</span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *) </span><span class="identifier-syntax">RP</span><span class="plain-syntax">[3]));</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Equations::declare_local_variables</span><span class="plain-syntax">(</span><span class="identifier-syntax">eqn</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Equations::examine</span><span class="plain-syntax">(</span><span class="identifier-syntax">eqn</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> ==> { -, </span><a href="4-teav.html#SP10" class="function-link"><span class="function-syntax">SPType::val</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">eq</span><span class="plain-syntax">, </span><span class="identifier-syntax">W</span><span class="plain-syntax">) };</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="4-teav.html#SP11">§11</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP11_2" class="paragraph-anchor"></a><b>§11.2. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">An equation, if kinds are right</span><span class="named-paragraph-number">11.2</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">p</span><span class="plain-syntax"> = </span><span class="identifier-syntax">RP</span><span class="plain-syntax">[1];</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (!(</span><a href="2-rvl.html#SP21" class="function-link"><span class="function-syntax">Rvalues::is_CONSTANT_of_kind</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">p</span><span class="plain-syntax">, </span><span class="identifier-syntax">K_equation</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">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">eq</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">equation</span><span class="plain-syntax"> *</span><span class="identifier-syntax">eqn</span><span class="plain-syntax"> = </span><a href="2-rvl.html#SP3" class="function-link"><span class="function-syntax">Rvalues::to_equation</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">eq</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">EquationSolver::set_usage_notes</span><span class="plain-syntax">(</span><span class="identifier-syntax">eqn</span><span class="plain-syntax">, </span><span class="identifier-syntax">Node::get_text</span><span class="plain-syntax">((</span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *) </span><span class="identifier-syntax">RP</span><span class="plain-syntax">[2]));</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Equations::declare_local_variables</span><span class="plain-syntax">(</span><span class="identifier-syntax">eqn</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Equations::examine</span><span class="plain-syntax">(</span><span class="identifier-syntax">eqn</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> ==> { -, </span><a href="4-teav.html#SP10" class="function-link"><span class="function-syntax">SPType::val</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">eq</span><span class="plain-syntax">, </span><span class="identifier-syntax">W</span><span class="plain-syntax">) };</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="4-teav.html#SP11">§11</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP11_3" class="paragraph-anchor"></a><b>§11.3. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">An inline equation</span><span class="named-paragraph-number">11.3</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">equation</span><span class="plain-syntax"> *</span><span class="identifier-syntax">eqn</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Equations::new</span><span class="plain-syntax">(</span><span class="identifier-syntax">Node::get_text</span><span class="plain-syntax">((</span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *) </span><span class="identifier-syntax">RP</span><span class="plain-syntax">[2]), </span><span class="identifier-syntax">TRUE</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">eq</span><span class="plain-syntax"> = </span><a href="2-rvl.html#SP2" class="function-link"><span class="function-syntax">Rvalues::from_equation</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">eqn</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Equations::declare_local_variables</span><span class="plain-syntax">(</span><span class="identifier-syntax">eqn</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Equations::examine</span><span class="plain-syntax">(</span><span class="identifier-syntax">eqn</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> ==> { -, </span><a href="4-teav.html#SP10" class="function-link"><span class="function-syntax">SPType::val</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">eq</span><span class="plain-syntax">, </span><span class="identifier-syntax">W</span><span class="plain-syntax">) };</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="4-teav.html#SP11">§11</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP9_1" class="paragraph-anchor"></a><b>§9.1. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Belonging-to-it prop</span><span class="named-paragraph-number">9.1</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">lvspec</span><span class="plain-syntax"> =</span>
|
|
<span class="plain-syntax"> </span><a href="2-lvl.html#SP2" class="function-link"><span class="function-syntax">Lvalues::new_LOCAL_VARIABLE</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">EMPTY_WORDING</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">LocalVariables::it_variable</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">val</span><span class="plain-syntax"> = </span><a href="4-teav.html#SP10" class="function-link"><span class="function-syntax">SPType::val</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">lvspec</span><span class="plain-syntax">, </span><span class="identifier-syntax">EMPTY_WORDING</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> ==> { -, </span><a href="4-teav.html#SP10" class="function-link"><span class="function-syntax">SPType::val</span></a><span class="plain-syntax">(</span><a href="4-teav.html#SP12" class="function-link"><span class="function-syntax">SPType::p_o_val</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">RP</span><span class="plain-syntax">[3], </span><span class="identifier-syntax">val</span><span class="plain-syntax">), </span><span class="identifier-syntax">W</span><span class="plain-syntax">) };</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="4-teav.html#SP9">§9</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP9_2" class="paragraph-anchor"></a><b>§9.2. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Belonging-to-V prop</span><span class="named-paragraph-number">9.2</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> ==> { -, </span><a href="4-teav.html#SP10" class="function-link"><span class="function-syntax">SPType::val</span></a><span class="plain-syntax">(</span><a href="4-teav.html#SP12" class="function-link"><span class="function-syntax">SPType::p_o_val</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">RP</span><span class="plain-syntax">[1], </span><span class="identifier-syntax">RP</span><span class="plain-syntax">[2]), </span><span class="identifier-syntax">W</span><span class="plain-syntax">) };</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="4-teav.html#SP9">§9</a>.</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">Make a list entry</span><span class="named-paragraph-number">9.3</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">val</span><span class="plain-syntax"> = </span><a href="2-lvl.html#SP5" class="function-link"><span class="function-syntax">Lvalues::new_LIST_ENTRY</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">RP</span><span class="plain-syntax">[2], </span><span class="identifier-syntax">RP</span><span class="plain-syntax">[1]);</span>
|
|
<span class="plain-syntax"> ==> { -, </span><a href="4-teav.html#SP10" class="function-link"><span class="function-syntax">SPType::val</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">val</span><span class="plain-syntax">, </span><span class="identifier-syntax">W</span><span class="plain-syntax">) };</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="4-teav.html#SP9">§9</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP12" class="paragraph-anchor"></a><b>§12. </b></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">SPType::p_o_val</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">SPType::p_o_val</span></span>:<br/><a href="4-teav.html#SP9_1">§9.1</a>, <a href="4-teav.html#SP9_2">§9.2</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">A</span><span class="plain-syntax">, </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">B</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">pts</span><span class="plain-syntax"> =</span>
|
|
<span class="plain-syntax"> (</span><span class="identifier-syntax">Node::get_type</span><span class="plain-syntax">(</span><span class="identifier-syntax">A</span><span class="plain-syntax">) == </span><span class="identifier-syntax">UNKNOWN_NT</span><span class="plain-syntax">) ?</span>
|
|
<span class="plain-syntax"> </span><a href="2-spc.html#SP11" class="function-link"><span class="function-syntax">Specifications::new_UNKNOWN</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">Node::get_text</span><span class="plain-syntax">(</span><span class="identifier-syntax">A</span><span class="plain-syntax">)) :</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">A</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">vts</span><span class="plain-syntax"> = </span><span class="identifier-syntax">B</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><a href="2-lvl.html#SP6" class="function-link"><span class="function-syntax">Lvalues::new_PROPERTY_VALUE</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">pts</span><span class="plain-syntax">, </span><span class="identifier-syntax">vts</span><span class="plain-syntax">);</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><span class="identifier-syntax">Node::get_text</span><span class="plain-syntax">(</span><span class="identifier-syntax">A</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">wording</span><span class="plain-syntax"> </span><span class="identifier-syntax">VW</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Node::get_text</span><span class="plain-syntax">(</span><span class="identifier-syntax">B</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">Wordings::nonempty</span><span class="plain-syntax">(</span><span class="identifier-syntax">PW</span><span class="plain-syntax">)) && (</span><span class="identifier-syntax">Wordings::nonempty</span><span class="plain-syntax">(</span><span class="identifier-syntax">VW</span><span class="plain-syntax">))) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">wording</span><span class="plain-syntax"> </span><span class="identifier-syntax">MW</span><span class="plain-syntax"> = </span><span class="identifier-syntax">PW</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Wordings::first_wn</span><span class="plain-syntax">(</span><span class="identifier-syntax">MW</span><span class="plain-syntax">) > </span><span class="identifier-syntax">Wordings::first_wn</span><span class="plain-syntax">(</span><span class="identifier-syntax">VW</span><span class="plain-syntax">))</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">MW</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Wordings::from</span><span class="plain-syntax">(</span><span class="identifier-syntax">MW</span><span class="plain-syntax">, </span><span class="identifier-syntax">Wordings::first_wn</span><span class="plain-syntax">(</span><span class="identifier-syntax">VW</span><span class="plain-syntax">));</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Wordings::last_wn</span><span class="plain-syntax">(</span><span class="identifier-syntax">MW</span><span class="plain-syntax">) < </span><span class="identifier-syntax">Wordings::last_wn</span><span class="plain-syntax">(</span><span class="identifier-syntax">VW</span><span class="plain-syntax">))</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">MW</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Wordings::up_to</span><span class="plain-syntax">(</span><span class="identifier-syntax">MW</span><span class="plain-syntax">, </span><span class="identifier-syntax">Wordings::last_wn</span><span class="plain-syntax">(</span><span class="identifier-syntax">VW</span><span class="plain-syntax">));</span>
|
|
<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">MW</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">spec</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP13" class="paragraph-anchor"></a><b>§13. Variables. </b>Internally there
|
|
are three sources of these: locals, defined by "let" or "repeat" phrases;
|
|
shared variables, which belong to rulebooks, actions or activities; and
|
|
global variables. The narrower in scope take priority over the broader: so
|
|
if there are both local and global variables called "grand total", then
|
|
the text "grand total" is parsed as the local.
|
|
</p>
|
|
|
|
<pre class="Preform-displayed-code all-displayed-code code-font">
|
|
<span class="Preform-function-syntax"><s-variable></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">::=</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><definite-article></span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-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"> { pass 2 }</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"> { pass 1 }</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-stacked-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"> { pass 1 }</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-global-variable></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-nonglobal-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"> </span><span class="Preform-function-syntax"><s-nonglobal-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"> </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-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"> { -, SPType::val(RP[1], W) }</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-stacked-variable></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> { -, SPType::val(RP[1], W) }</span>
|
|
|
|
<span class="Preform-function-syntax"><s-variable-as-value></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-variable></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> { -, SPType::val(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="SP14" class="paragraph-anchor"></a><b>§14. </b>This requires three internals:
|
|
</p>
|
|
|
|
<pre class="Preform-displayed-code all-displayed-code code-font">
|
|
<span class="Preform-function-syntax"><s-local-variable></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">local_variable</span><span class="Preform-plain-syntax"> *</span><span class="Preform-identifier-syntax">lvar</span><span class="Preform-plain-syntax"> = </span><span class="Preform-identifier-syntax">LocalVariables::parse</span><span class="Preform-plain-syntax">(</span><span class="Preform-identifier-syntax">Frames::current_stack_frame</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">lvar</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><a href="2-lvl.html#SP2" class="function-link"><span class="Preform-function-syntax">Lvalues::new_LOCAL_VARIABLE</span></a><span class="Preform-plain-syntax">(</span><span class="Preform-identifier-syntax">W</span><span class="Preform-plain-syntax">, </span><span class="Preform-identifier-syntax">lvar</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-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="SP15" class="paragraph-anchor"></a><b>§15. </b>And similarly:
|
|
</p>
|
|
|
|
<pre class="Preform-displayed-code all-displayed-code code-font">
|
|
<span class="Preform-function-syntax"><s-stacked-variable></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">stack_frame</span><span class="Preform-plain-syntax"> *</span><span class="Preform-identifier-syntax">phsf</span><span class="Preform-plain-syntax"> = </span><span class="Preform-identifier-syntax">Frames::current_stack_frame</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">phsf</span><span class="Preform-plain-syntax"> == </span><span class="Preform-identifier-syntax">NULL</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><span class="Preform-identifier-syntax">shared_variable</span><span class="Preform-plain-syntax"> *</span><span class="Preform-identifier-syntax">stv</span><span class="Preform-plain-syntax"> = </span><span class="Preform-identifier-syntax">SharedVariables::parse_from_access_list</span><span class="Preform-plain-syntax">(</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">Frames::get_shared_variable_access_list</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">stv</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><a href="2-lvl.html#SP2" class="function-link"><span class="Preform-function-syntax">Lvalues::new_actual_NONLOCAL_VARIABLE</span></a><span class="Preform-plain-syntax">(</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">SharedVariables::get_variable</span><span class="Preform-plain-syntax">(</span><span class="Preform-identifier-syntax">stv</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-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="SP16" class="paragraph-anchor"></a><b>§16. </b>And:
|
|
</p>
|
|
|
|
<pre class="Preform-displayed-code all-displayed-code code-font">
|
|
<span class="Preform-function-syntax"><s-global-variable></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">VARIABLE_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-identifier-syntax">p</span><span class="Preform-plain-syntax"> }; </span><span class="Preform-reserved-syntax">return</span><span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">TRUE</span><span class="Preform-plain-syntax">; }</span>
|
|
<span class="Preform-plain-syntax"> ==> { </span><span class="Preform-identifier-syntax">fail</span><span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">nonterminal</span><span class="Preform-plain-syntax"> };</span>
|
|
<span class="Preform-plain-syntax">}</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This is <a href="../words-module/4-ap.html" class="internal">Preform grammar</a>, not regular C code.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP17" class="paragraph-anchor"></a><b>§17. </b>As noted above, we want to parse phrases containing "of" cautiously in
|
|
cases where the excerpt being parsed looks as if it might be a property
|
|
rather than use of a phrase. Here's how we tell whether it looks that way:
|
|
</p>
|
|
|
|
<pre class="Preform-displayed-code all-displayed-code code-font">
|
|
<span class="Preform-function-syntax"><property-of-shape></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-property-name></span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">of</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-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="SP18" class="paragraph-anchor"></a><b>§18. </b>We implement this by telling the excerpt parser, temporarily, not to match
|
|
anything including the word "of":
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="identifier-syntax">vocabulary_entry</span><span class="plain-syntax"> *</span><span class="identifier-syntax">property_word_to_suppress</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP19" class="paragraph-anchor"></a><b>§19. </b>And here are the relevant internals:
|
|
</p>
|
|
|
|
<pre class="Preform-displayed-code all-displayed-code code-font">
|
|
<span class="Preform-function-syntax"><s-value-phrase-non-of></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">W</span><span class="Preform-plain-syntax"> = </span><span class="Preform-identifier-syntax">Articles::remove_the</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">vocabulary_entry</span><span class="Preform-plain-syntax"> *</span><span class="Preform-identifier-syntax">suppression</span><span class="Preform-plain-syntax"> = </span><span class="Preform-identifier-syntax">word_to_suppress_in_phrases</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-function-syntax"><property-of-shape></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">property_word_to_suppress</span><span class="Preform-plain-syntax"> == </span><span class="Preform-identifier-syntax">NULL</span><span class="Preform-plain-syntax">)</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">property_word_to_suppress</span><span class="Preform-plain-syntax"> = </span><span class="Preform-identifier-syntax">PreformUtilities::word</span><span class="Preform-plain-syntax">(</span><span class="Preform-function-syntax"><property-of-shape></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><span class="Preform-identifier-syntax">word_to_suppress_in_phrases</span><span class="Preform-plain-syntax"> = </span><span class="Preform-identifier-syntax">property_word_to_suppress</span><span class="Preform-plain-syntax">;</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">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">VALUE_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-identifier-syntax">word_to_suppress_in_phrases</span><span class="Preform-plain-syntax"> = </span><span class="Preform-identifier-syntax">suppression</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-identifier-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="4-cap.html#SP10" class="function-link"><span class="Preform-function-syntax">SPCond::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-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>
|
|
|
|
<span class="Preform-function-syntax"><s-value-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">W</span><span class="Preform-plain-syntax"> = </span><span class="Preform-identifier-syntax">Articles::remove_the</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">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">VALUE_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-identifier-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="4-cap.html#SP10" class="function-link"><span class="Preform-function-syntax">SPCond::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-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="SP20" class="paragraph-anchor"></a><b>§20. Table references. </b>Table references come in five different forms:
|
|
</p>
|
|
|
|
<ul class="items"><li>(a) For instance, "atomic number entry", meaning the entry in that column
|
|
and implicitly in the table and row currently selected.
|
|
</li><li>(b) For instance, "atomic number in row 4 of the Table of Elements".
|
|
</li><li>(c) For instance, "an atomic number listed in the Table of Elements" in the
|
|
sentence "if 101 is an atomic number listed in the Table of Elements". This
|
|
is part of a condition, and can't evaluate.
|
|
</li><li>(d) For instance, "atomic weight corresponding to an atomic number of 57 in
|
|
the Table of Elements".
|
|
</li><li>(e) For instance, "atomic weight of 20 in the Table of Elements" in the
|
|
sentence "if there is an atomic weight of 20 in the Table of Elements".
|
|
Again, this is part of a condition, and can't evaluate.
|
|
</li></ul>
|
|
<pre class="Preform-displayed-code all-displayed-code code-font">
|
|
<span class="Preform-function-syntax"><s-table-reference></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-table-column-name></span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">entry</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="4-teav.html#SP20_1" class="named-paragraph-link"><span class="named-paragraph">Table (a)</span><span class="named-paragraph-number">20.1</span></a></span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-table-column-name></span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">in</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">row</span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-value-uncached></span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">of</span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-value-uncached></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="4-teav.html#SP20_2" class="named-paragraph-link"><span class="named-paragraph">Table (b)</span><span class="named-paragraph-number">20.2</span></a></span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-table-column-name></span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">listed</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">in</span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-value-uncached></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="4-teav.html#SP20_3" class="named-paragraph-link"><span class="named-paragraph">Table (c)</span><span class="named-paragraph-number">20.3</span></a></span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-table-column-name></span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">corresponding</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">to</span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-table-column-name></span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">of</span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-value-uncached></span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">in</span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-value-uncached></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="4-teav.html#SP20_4" class="named-paragraph-link"><span class="named-paragraph">Table (d)</span><span class="named-paragraph-number">20.4</span></a></span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-table-column-name></span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">of</span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-value-uncached></span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">in</span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><s-value-uncached></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="4-teav.html#SP20_5" class="named-paragraph-link"><span class="named-paragraph">Table (e)</span><span class="named-paragraph-number">20.5</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="SP20_1" class="paragraph-anchor"></a><b>§20.1. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Table (a)</span><span class="named-paragraph-number">20.1</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">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">spec</span><span class="plain-syntax"> = </span><a href="2-lvl.html#SP4" class="function-link"><span class="function-syntax">Lvalues::new_TABLE_ENTRY</span></a><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">spec</span><span class="plain-syntax">-></span><span class="identifier-syntax">down</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">LocalVariables::are_we_using_table_lookup</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">problem_count</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">StandardProblems::sentence_problem</span><span class="plain-syntax">(</span><span class="identifier-syntax">Task::syntax_tree</span><span class="plain-syntax">(), </span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_NoRowSelected</span><span class="plain-syntax">),</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"no row seems to have been chosen at this point"</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"so it doesn't make sense to talk about the entries "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"within it. (By 'at this point', I mean the point "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"when the table will have to be looked at. This "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"might be at another time altogether if we are "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"storing away instructions for later in a text "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"substitution, e.g., writing 'now the description "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"of the player is \"Thoroughly [vanity entry].\";' "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"- remember that the substitution is acted on "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"when the text is printed, which could be at any "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"time, and no row will be chosen then.)"</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>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="4-teav.html#SP20">§20</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP20_2" class="paragraph-anchor"></a><b>§20.2. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Table (b)</span><span class="named-paragraph-number">20.2</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">spec</span><span class="plain-syntax"> = </span><a href="2-lvl.html#SP4" class="function-link"><span class="function-syntax">Lvalues::new_TABLE_ENTRY</span></a><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">spec</span><span class="plain-syntax">-></span><span class="identifier-syntax">down</span><span class="plain-syntax"> = </span><a href="4-teav.html#SP21" class="function-link"><span class="function-syntax">SPType::arg</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">RP</span><span class="plain-syntax">[1]);</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">next</span><span class="plain-syntax"> = </span><a href="4-teav.html#SP21" class="function-link"><span class="function-syntax">SPType::arg</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">RP</span><span class="plain-syntax">[2]);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">spec</span><span class="plain-syntax">-></span><span class="identifier-syntax">down</span><span class="plain-syntax">-></span><span class="element-syntax">next</span><span class="plain-syntax">-></span><span class="element-syntax">next</span><span class="plain-syntax"> = </span><a href="4-teav.html#SP21" class="function-link"><span class="function-syntax">SPType::arg</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">RP</span><span class="plain-syntax">[3]);</span>
|
|
<span class="plain-syntax"> ==> { -, </span><span class="identifier-syntax">spec</span><span class="plain-syntax"> };</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="4-teav.html#SP20">§20</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP20_3" class="paragraph-anchor"></a><b>§20.3. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Table (c)</span><span class="named-paragraph-number">20.3</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">spec</span><span class="plain-syntax"> = </span><a href="2-lvl.html#SP4" class="function-link"><span class="function-syntax">Lvalues::new_TABLE_ENTRY</span></a><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">spec</span><span class="plain-syntax">-></span><span class="identifier-syntax">down</span><span class="plain-syntax"> = </span><a href="4-teav.html#SP21" class="function-link"><span class="function-syntax">SPType::arg</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">RP</span><span class="plain-syntax">[1]);</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">next</span><span class="plain-syntax"> = </span><a href="4-teav.html#SP21" class="function-link"><span class="function-syntax">SPType::arg</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">RP</span><span class="plain-syntax">[2]);</span>
|
|
<span class="plain-syntax"> ==> { -, </span><span class="identifier-syntax">spec</span><span class="plain-syntax"> };</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="4-teav.html#SP20">§20</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP20_4" class="paragraph-anchor"></a><b>§20.4. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Table (d)</span><span class="named-paragraph-number">20.4</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">spec</span><span class="plain-syntax"> = </span><a href="2-lvl.html#SP4" class="function-link"><span class="function-syntax">Lvalues::new_TABLE_ENTRY</span></a><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">spec</span><span class="plain-syntax">-></span><span class="identifier-syntax">down</span><span class="plain-syntax"> = </span><a href="4-teav.html#SP21" class="function-link"><span class="function-syntax">SPType::arg</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">RP</span><span class="plain-syntax">[1]);</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">next</span><span class="plain-syntax"> = </span><a href="4-teav.html#SP21" class="function-link"><span class="function-syntax">SPType::arg</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">RP</span><span class="plain-syntax">[2]);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">spec</span><span class="plain-syntax">-></span><span class="identifier-syntax">down</span><span class="plain-syntax">-></span><span class="element-syntax">next</span><span class="plain-syntax">-></span><span class="element-syntax">next</span><span class="plain-syntax"> = </span><a href="4-teav.html#SP21" class="function-link"><span class="function-syntax">SPType::arg</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">RP</span><span class="plain-syntax">[3]);</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">next</span><span class="plain-syntax">-></span><span class="element-syntax">next</span><span class="plain-syntax">-></span><span class="element-syntax">next</span><span class="plain-syntax"> = </span><a href="4-teav.html#SP21" class="function-link"><span class="function-syntax">SPType::arg</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">RP</span><span class="plain-syntax">[4]);</span>
|
|
<span class="plain-syntax"> ==> { -, </span><span class="identifier-syntax">spec</span><span class="plain-syntax"> };</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="4-teav.html#SP20">§20</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP20_5" class="paragraph-anchor"></a><b>§20.5. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Table (e)</span><span class="named-paragraph-number">20.5</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">spec</span><span class="plain-syntax"> = </span><a href="2-lvl.html#SP4" class="function-link"><span class="function-syntax">Lvalues::new_TABLE_ENTRY</span></a><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">spec</span><span class="plain-syntax">-></span><span class="identifier-syntax">down</span><span class="plain-syntax"> = </span><a href="4-teav.html#SP21" class="function-link"><span class="function-syntax">SPType::arg</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">RP</span><span class="plain-syntax">[1]);</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">next</span><span class="plain-syntax"> = </span><a href="4-teav.html#SP21" class="function-link"><span class="function-syntax">SPType::arg</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">RP</span><span class="plain-syntax">[1]);</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">next</span><span class="plain-syntax">-></span><span class="element-syntax">next</span><span class="plain-syntax"> = </span><a href="4-teav.html#SP21" class="function-link"><span class="function-syntax">SPType::arg</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">RP</span><span class="plain-syntax">[2]);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">spec</span><span class="plain-syntax">-></span><span class="identifier-syntax">down</span><span class="plain-syntax">-></span><span class="element-syntax">next</span><span class="plain-syntax">-></span><span class="element-syntax">next</span><span class="plain-syntax">-></span><span class="element-syntax">next</span><span class="plain-syntax"> = </span><a href="4-teav.html#SP21" class="function-link"><span class="function-syntax">SPType::arg</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">RP</span><span class="plain-syntax">[3]);</span>
|
|
<span class="plain-syntax"> ==> { -, </span><span class="identifier-syntax">spec</span><span class="plain-syntax"> };</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="4-teav.html#SP20">§20</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP21" class="paragraph-anchor"></a><b>§21. </b></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">SPType::arg</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">SPType::arg</span></span>:<br/><a href="4-teav.html#SP20_2">§20.2</a>, <a href="4-teav.html#SP20_3">§20.3</a>, <a href="4-teav.html#SP20_4">§20.4</a>, <a href="4-teav.html#SP20_5">§20.5</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">val</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">val</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="2-spc.html#SP11" class="function-link"><span class="function-syntax">Specifications::new_UNKNOWN</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">EMPTY_WORDING</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">Node::duplicate</span><span class="plain-syntax">(</span><span class="identifier-syntax">val</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<nav role="progress"><div class="progresscontainer">
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