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<title>Type Expressions and Values</title>
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<!--Weave of 'Type Expressions and Values' generated by 7-->
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<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../compiler.html">Inform7 Modules</a></li><li><a href="index.html">core</a></li><li><a href="index.html#10">Chapter 10: The S-Parser</a></li><li><b>Type Expressions and Values</b></li></ul><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="10-teav.html#SP1">§1. Definitions</a></li><li><a href="10-teav.html#SP3">§3. Type expressions</a></li><li><a href="10-teav.html#SP10">§10. Values</a></li><li><a href="10-teav.html#SP14">§14. Variables</a></li><li><a href="10-teav.html#SP21">§21. Table references</a></li></ul><hr class="tocbar">
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<p class="inwebparagraph"><a id="SP1"></a><b>§1. Definitions. </b></p>
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<p class="inwebparagraph"><a id="SP2"></a><b>§2. </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="inwebparagraph">The following example sentences have the relevant phrases in bold.
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</p>
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<blockquote>
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<p>[1] if the idea of the gizmo is {\bf taking the fish}, ...</p>
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</blockquote>
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<blockquote>
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<p>[2] if there are {\bf three women} in the Nunnery, ...</p>
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</blockquote>
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<blockquote>
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<p>[3a: as description] Before taking {\bf the harmonium}, ...</p>
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</blockquote>
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<blockquote>
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<p>[3b: as constant] let X be {\bf the harmonium};</p>
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</blockquote>
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<blockquote>
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<p>[4] now Y is {\bf the can't reach inside rooms rule};</p>
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</blockquote>
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<blockquote>
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<p>[5] now Z is {\bf the time of day};</p>
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</blockquote>
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<blockquote>
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<p>[6] let N be {\bf the number of entries in L};</p>
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</blockquote>
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<blockquote>
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<p>[7] Understand "turn to [{\bf number}]" as combination-setting.</p>
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</blockquote>
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<blockquote>
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<p>[8] To repeat until (C - {\bf condition}): ...</p>
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</blockquote>
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<blockquote>
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<p>[9] The Zeppelin countdown is a {\bf number that varies}.</p>
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</blockquote>
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<blockquote>
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<p>[10] The little red car is a {\bf vehicle}.</p>
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</blockquote>
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<blockquote>
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<p>[11] The weight of the Space Shuttle is {\bf 68585 kg}.</p>
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</blockquote>
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<p class="inwebparagraph"><a id="SP3"></a><b>§3. 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="inwebparagraph">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="inwebparagraph">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="inwebparagraph">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="display">
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<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">type</span><span class="plain">-</span><span class="identifier">expression</span><span class="plain">-</span><span class="identifier">uncached</span><span class="plain">> ::=</span>
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<span class="plain"><</span><span class="identifier">article</span><span class="plain">> <</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">type</span><span class="plain">-</span><span class="identifier">expression</span><span class="plain">-</span><span class="identifier">unarticled</span><span class="plain">> | ==> </span><span class="identifier">RP</span><span class="plain">[2]</span>
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<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">type</span><span class="plain">-</span><span class="identifier">expression</span><span class="plain">-</span><span class="identifier">unarticled</span><span class="plain">> ==> </span><span class="identifier">RP</span><span class="plain">[1]</span>
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<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">type</span><span class="plain">-</span><span class="identifier">expression</span><span class="plain">-</span><span class="identifier">unarticled</span><span class="plain">> ::=</span>
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<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">variable</span><span class="plain">-</span><span class="identifier">scope</span><span class="plain">> </span><span class="identifier">variable</span><span class="plain">/</span><span class="identifier">variables</span><span class="plain"> | ==> </span><span class="identifier">RP</span><span class="plain">[1]</span>
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<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">variable</span><span class="plain">-</span><span class="identifier">scope</span><span class="plain">> </span><span class="identifier">that</span><span class="plain">/</span><span class="identifier">which</span><span class="plain"> </span><span class="identifier">vary</span><span class="plain">/</span><span class="identifier">varies</span><span class="plain"> | ==> </span><span class="identifier">RP</span><span class="plain">[1]</span>
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<span class="plain"><</span><span class="identifier">k</span><span class="plain">-</span><span class="identifier">kind</span><span class="plain">> | ==> </span><span class="functiontext"><a href="14-sp.html#SP1">Specifications::from_kind</a></span><span class="plain">(</span><span class="identifier">RP</span><span class="plain">[1])</span>
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<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">literal</span><span class="plain">> | ==> </span><span class="identifier">RP</span><span class="plain">[1]</span>
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<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">constant</span><span class="plain">-</span><span class="identifier">value</span><span class="plain">> | ==> </span><span class="identifier">RP</span><span class="plain">[1]</span>
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<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">description</span><span class="plain">-</span><span class="identifier">uncomposite</span><span class="plain">> | ==> </span><span class="identifier">RP</span><span class="plain">[1]</span>
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<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">action</span><span class="plain">-</span><span class="identifier">pattern</span><span class="plain">-</span><span class="identifier">as</span><span class="plain">-</span><span class="identifier">value</span><span class="plain">> | ==> </span><span class="identifier">RP</span><span class="plain">[1]</span>
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<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">description</span><span class="plain">> ==> </span><span class="identifier">RP</span><span class="plain">[1]</span>
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</pre>
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<p class="inwebparagraph"></p>
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<p class="inwebparagraph"><a id="SP4"></a><b>§4. </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="inwebparagraph">is allowed even though "scenery" is an adjective in Inform.
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</p>
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<p class="inwebparagraph">To allow this, we have a minor variation:
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</p>
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<pre class="display">
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<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">descriptive</span><span class="plain">-</span><span class="identifier">type</span><span class="plain">-</span><span class="identifier">expression</span><span class="plain">-</span><span class="identifier">uncached</span><span class="plain">> ::=</span>
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<span class="plain"><</span><span class="identifier">article</span><span class="plain">> <</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">descriptive</span><span class="plain">-</span><span class="identifier">type</span><span class="plain">-</span><span class="identifier">expression</span><span class="plain">-</span><span class="identifier">unarticled</span><span class="plain">> | ==> </span><span class="identifier">RP</span><span class="plain">[2]</span>
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<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">descriptive</span><span class="plain">-</span><span class="identifier">type</span><span class="plain">-</span><span class="identifier">expression</span><span class="plain">-</span><span class="identifier">unarticled</span><span class="plain">> ==> </span><span class="identifier">RP</span><span class="plain">[1]</span>
|
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|
<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">descriptive</span><span class="plain">-</span><span class="identifier">type</span><span class="plain">-</span><span class="identifier">expression</span><span class="plain">-</span><span class="identifier">unarticled</span><span class="plain">> ::=</span>
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<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">adjective</span><span class="plain">-</span><span class="identifier">list</span><span class="plain">-</span><span class="identifier">as</span><span class="plain">-</span><span class="identifier">desc</span><span class="plain">> | ==> </span><span class="identifier">RP</span><span class="plain">[1]</span>
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<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">type</span><span class="plain">-</span><span class="identifier">expression</span><span class="plain">-</span><span class="identifier">unarticled</span><span class="plain">> ==> </span><span class="identifier">RP</span><span class="plain">[1]</span>
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</pre>
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<p class="inwebparagraph"></p>
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<p class="inwebparagraph"><a id="SP5"></a><b>§5. </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="inwebparagraph">where <s-variable-scope> matches "existing number variable".
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</p>
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<p class="inwebparagraph">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="display">
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<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">variable</span><span class="plain">-</span><span class="identifier">scope</span><span class="plain">> ::=</span>
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<span class="identifier">global</span><span class="plain"> | ==> </span><span class="functiontext"><a href="14-sp.html#SP5">Specifications::new_new_variable_like</a></span><span class="plain">(</span><span class="identifier">NULL</span><span class="plain">)</span>
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<span class="identifier">global</span><span class="plain"> <</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">variable</span><span class="plain">-</span><span class="identifier">contents</span><span class="plain">> | ==> </span><span class="identifier">RP</span><span class="plain">[1]</span>
|
|
<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">variable</span><span class="plain">-</span><span class="identifier">contents</span><span class="plain">> ==> </span><span class="identifier">RP</span><span class="plain">[1]</span>
|
|
|
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<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">variable</span><span class="plain">-</span><span class="identifier">contents</span><span class="plain">> ::=</span>
|
|
<span class="plain"><</span><span class="identifier">k</span><span class="plain">-</span><span class="identifier">kind</span><span class="plain">> | ==> </span><span class="functiontext"><a href="14-sp.html#SP5">Specifications::new_new_variable_like</a></span><span class="plain">(</span><span class="identifier">RP</span><span class="plain">[1])</span>
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<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">literal</span><span class="plain">> | ==> </span><<span class="cwebmacro">Issue PM_TypeCantVary problem</span> <span class="cwebmacronumber">5.1</span>>
|
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<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">constant</span><span class="plain">-</span><span class="identifier">value</span><span class="plain">> | ==> </span><<span class="cwebmacro">Issue PM_TypeCantVary problem</span> <span class="cwebmacronumber">5.1</span>>
|
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<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">description</span><span class="plain">-</span><span class="identifier">uncomposite</span><span class="plain">> | ==> </span><<span class="cwebmacro">Issue PM_TypeUnmaintainable problem</span> <span class="cwebmacronumber">5.2</span>>
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<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">description</span><span class="plain">> ==> </span><<span class="cwebmacro">Issue PM_TypeUnmaintainable problem</span> <span class="cwebmacronumber">5.2</span>>
|
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</pre>
|
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<p class="inwebparagraph"></p>
|
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|
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<p class="inwebparagraph"><a id="SP5_1"></a><b>§5.1. </b><code class="display">
|
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<<span class="cwebmacrodefn">Issue PM_TypeCantVary problem</span> <span class="cwebmacronumber">5.1</span>> =
|
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</code></p>
|
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|
|
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<pre class="displaydefn">
|
|
<span class="identifier">Problems::quote_source</span><span class="plain">(1, </span><span class="identifier">current_sentence</span><span class="plain">);</span>
|
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<span class="identifier">Problems::quote_wording</span><span class="plain">(2, </span><span class="identifier">W</span><span class="plain">);</span>
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<span class="identifier">Problems::Issue::handmade_problem</span><span class="plain">(</span><span class="functiontext"><a href="1-wtc.html#SP5">Task::syntax_tree</a></span><span class="plain">(), </span><span class="identifier">_p_</span><span class="plain">(</span><span class="identifier">PM_TypeCantVary</span><span class="plain">));</span>
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<span class="identifier">Problems::issue_problem_segment</span><span class="plain">(</span>
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<span class="string">"In %1, '%2' is not a kind of value which a variable can safely have, "</span>
|
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<span class="string">"as it cannot ever vary."</span><span class="plain">);</span>
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<span class="identifier">Problems::issue_problem_end</span><span class="plain">();</span>
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<span class="plain">*</span><span class="identifier">XP</span><span class="plain"> = </span><span class="functiontext"><a href="14-sp.html#SP5">Specifications::new_new_variable_like</a></span><span class="plain">(</span><span class="identifier">K_object</span><span class="plain">);</span>
|
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</pre>
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<p class="inwebparagraph"></p>
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<p class="endnote">This code is used in <a href="10-teav.html#SP5">§5</a> (twice).</p>
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<p class="inwebparagraph"><a id="SP5_2"></a><b>§5.2. </b><code class="display">
|
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<<span class="cwebmacrodefn">Issue PM_TypeUnmaintainable problem</span> <span class="cwebmacronumber">5.2</span>> =
|
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</code></p>
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|
|
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<pre class="displaydefn">
|
|
<span class="identifier">Problems::quote_source</span><span class="plain">(1, </span><span class="identifier">current_sentence</span><span class="plain">);</span>
|
|
<span class="identifier">Problems::quote_wording</span><span class="plain">(2, </span><span class="identifier">W</span><span class="plain">);</span>
|
|
<span class="identifier">Problems::Issue::handmade_problem</span><span class="plain">(</span><span class="functiontext"><a href="1-wtc.html#SP5">Task::syntax_tree</a></span><span class="plain">(), </span><span class="identifier">_p_</span><span class="plain">(</span><span class="identifier">PM_TypeUnmaintainable</span><span class="plain">));</span>
|
|
<span class="identifier">Problems::issue_problem_segment</span><span class="plain">(</span>
|
|
<span class="string">"In %1, '%2' is not a kind of value which a variable can safely have, "</span>
|
|
<span class="string">"as it cannot be guaranteed that the contents will always meet "</span>
|
|
<span class="string">"this criterion."</span><span class="plain">);</span>
|
|
<span class="identifier">Problems::issue_problem_end</span><span class="plain">();</span>
|
|
<span class="plain">*</span><span class="identifier">XP</span><span class="plain"> = </span><span class="functiontext"><a href="14-sp.html#SP5">Specifications::new_new_variable_like</a></span><span class="plain">(</span><span class="identifier">K_object</span><span class="plain">);</span>
|
|
</pre>
|
|
|
|
<p class="inwebparagraph"></p>
|
|
|
|
<p class="endnote">This code is used in <a href="10-teav.html#SP5">§5</a> (twice).</p>
|
|
|
|
<p class="inwebparagraph"><a id="SP6"></a><b>§6. </b>Two pieces of context:
|
|
</p>
|
|
|
|
<pre class="display">
|
|
<span class="reserved">int</span><span class="plain"> </span><span class="identifier">let_equation_mode</span><span class="plain"> = </span><span class="identifier">FALSE</span><span class="plain">;</span>
|
|
<span class="identifier">kind</span><span class="plain"> *</span><span class="identifier">probable_noun_phrase_context</span><span class="plain"> = </span><span class="identifier">NULL</span><span class="plain">;</span>
|
|
</pre>
|
|
|
|
<p class="inwebparagraph"></p>
|
|
|
|
<p class="inwebparagraph"><a id="SP7"></a><b>§7. </b>That's it for type expressions, and we move on to values. There are
|
|
three special circumstances in which we parse differently: while we could write
|
|
variant grammars for these situations, they would be very large and almost
|
|
identical to <s-value> anyway, so instead we simply use <s-value>.
|
|
</p>
|
|
|
|
<p class="inwebparagraph">The following matches only if we are in an equation written out in the phrase:
|
|
for example,
|
|
</p>
|
|
|
|
<blockquote>
|
|
<p>let V be given by V = fl;</p>
|
|
|
|
</blockquote>
|
|
|
|
<p class="inwebparagraph">As mentioned earlier, this changes our conventions on word-breaking.
|
|
</p>
|
|
|
|
<pre class="display">
|
|
<span class="plain"><</span><span class="reserved">if</span><span class="plain">-</span><span class="identifier">let</span><span class="plain">-</span><span class="reserved">equation</span><span class="plain">-</span><span class="identifier">mode</span><span class="plain">> </span><span class="identifier">internal</span><span class="plain"> </span><span class="constant">0</span><span class="plain"> {</span>
|
|
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">let_equation_mode</span><span class="plain">) </span><span class="reserved">return</span><span class="plain"> </span><span class="identifier">TRUE</span><span class="plain">;</span>
|
|
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">FALSE</span><span class="plain">;</span>
|
|
<span class="plain">}</span>
|
|
</pre>
|
|
|
|
<p class="inwebparagraph"></p>
|
|
|
|
<p class="inwebparagraph"><a id="SP8"></a><b>§8. </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="display">
|
|
<span class="plain"><</span><span class="reserved">if</span><span class="plain">-</span><span class="identifier">pronoun</span><span class="plain">-</span><span class="identifier">present</span><span class="plain">> </span><span class="identifier">internal</span><span class="plain"> </span><span class="constant">0</span><span class="plain"> {</span>
|
|
<span class="reserved">if</span><span class="plain"> (</span><span class="functiontext"><a href="24-lv.html#SP27">LocalVariables::is_possessive_form_of_it_enabled</a></span><span class="plain">()) </span><span class="reserved">return</span><span class="plain"> </span><span class="identifier">TRUE</span><span class="plain">;</span>
|
|
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">FALSE</span><span class="plain">;</span>
|
|
<span class="plain">}</span>
|
|
</pre>
|
|
|
|
<p class="inwebparagraph"></p>
|
|
|
|
<p class="inwebparagraph"><a id="SP9"></a><b>§9. </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="display">
|
|
<span class="plain"><</span><span class="reserved">if</span><span class="plain">-</span><span class="reserved">table</span><span class="plain">-</span><span class="identifier">column</span><span class="plain">-</span><span class="identifier">expected</span><span class="plain">> </span><span class="identifier">internal</span><span class="plain"> </span><span class="constant">0</span><span class="plain"> {</span>
|
|
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">Kinds::get_construct</span><span class="plain">(</span><span class="identifier">probable_noun_phrase_context</span><span class="plain">) == </span><span class="identifier">CON_table_column</span><span class="plain">)</span>
|
|
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">TRUE</span><span class="plain">;</span>
|
|
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">FALSE</span><span class="plain">;</span>
|
|
<span class="plain">}</span>
|
|
|
|
<span class="plain"><</span><span class="reserved">if</span><span class="plain">-</span><span class="reserved">property</span><span class="plain">-</span><span class="identifier">name</span><span class="plain">-</span><span class="identifier">expected</span><span class="plain">> </span><span class="identifier">internal</span><span class="plain"> </span><span class="constant">0</span><span class="plain"> {</span>
|
|
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">Kinds::get_construct</span><span class="plain">(</span><span class="identifier">probable_noun_phrase_context</span><span class="plain">) == </span><span class="identifier">CON_property</span><span class="plain">)</span>
|
|
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">TRUE</span><span class="plain">;</span>
|
|
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">FALSE</span><span class="plain">;</span>
|
|
<span class="plain">}</span>
|
|
</pre>
|
|
|
|
<p class="inwebparagraph"></p>
|
|
|
|
<p class="inwebparagraph"><a id="SP10"></a><b>§10. Values. </b>The boldface terms here are all parsed as values:
|
|
</p>
|
|
|
|
<blockquote>
|
|
<p>{\bf The cat} is in {\bf the bag}. The {\bf time of day} is {\bf 11:10 AM}.</p>
|
|
|
|
</blockquote>
|
|
|
|
<blockquote>
|
|
<p>award {\bf six} points;</p>
|
|
|
|
</blockquote>
|
|
|
|
<blockquote>
|
|
<p>if {\bf more than three animals} are in {\bf the kennel}, ...</p>
|
|
|
|
</blockquote>
|
|
|
|
<p class="inwebparagraph">The sequence here is important, in that it resolves ambiguities:
|
|
</p>
|
|
|
|
<p class="inwebparagraph"></p>
|
|
|
|
<ul class="items"><li>(b) Variable names have highest priority, in order to allow temporary "let"
|
|
names to mask existing meanings.
|
|
</li></ul>
|
|
<ul class="items"><li>(c) Constants come next: these include literals, but also named constants,
|
|
such as names of rooms or things.
|
|
</li></ul>
|
|
<ul class="items"><li>(d) Equations are an oddball exceptional case, seldom arising.
|
|
</li></ul>
|
|
<ul class="items"><li>(f) 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></ul>
|
|
<ul class="items"><li>(g) 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></ul>
|
|
<ul class="items"><li>(i) 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></ul>
|
|
<ul class="items"><li>(k) 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></ul>
|
|
<ul class="items"><li>(m) 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, really just a syntactic difference.
|
|
</li></ul>
|
|
<pre class="display">
|
|
<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">value</span><span class="plain">-</span><span class="identifier">uncached</span><span class="plain">> ::=</span>
|
|
<span class="plain">( <</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">value</span><span class="plain">-</span><span class="identifier">uncached</span><span class="plain">> ) | ==> </span><span class="identifier">RP</span><span class="plain">[1]</span>
|
|
<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">variable</span><span class="plain">> | ==> </span><span class="functiontext"><a href="10-teav.html#SP11">ExParser::val</a></span><span class="plain">(</span><span class="identifier">RP</span><span class="plain">[1], </span><span class="identifier">W</span><span class="plain">)</span>
|
|
<span class="plain"><</span><span class="reserved">if</span><span class="plain">-</span><span class="reserved">table</span><span class="plain">-</span><span class="identifier">column</span><span class="plain">-</span><span class="identifier">expected</span><span class="plain">> <</span><span class="identifier">s</span><span class="plain">-</span><span class="reserved">table</span><span class="plain">-</span><span class="identifier">column</span><span class="plain">-</span><span class="identifier">name</span><span class="plain">> | ==> </span><span class="functiontext"><a href="10-teav.html#SP11">ExParser::val</a></span><span class="plain">(</span><span class="identifier">RP</span><span class="plain">[2], </span><span class="identifier">W</span><span class="plain">)</span>
|
|
<span class="plain"><</span><span class="reserved">if</span><span class="plain">-</span><span class="reserved">property</span><span class="plain">-</span><span class="identifier">name</span><span class="plain">-</span><span class="identifier">expected</span><span class="plain">> <</span><span class="identifier">s</span><span class="plain">-</span><span class="reserved">property</span><span class="plain">-</span><span class="identifier">name</span><span class="plain">> | ==> </span><span class="functiontext"><a href="10-teav.html#SP11">ExParser::val</a></span><span class="plain">(</span><span class="identifier">RP</span><span class="plain">[2], </span><span class="identifier">W</span><span class="plain">)</span>
|
|
<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">constant</span><span class="plain">-</span><span class="identifier">value</span><span class="plain">> | ==> </span><span class="functiontext"><a href="10-teav.html#SP11">ExParser::val</a></span><span class="plain">(</span><span class="identifier">RP</span><span class="plain">[1], </span><span class="identifier">W</span><span class="plain">)</span>
|
|
<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="reserved">equation</span><span class="plain">-</span><span class="identifier">usage</span><span class="plain">> | ==> </span><span class="identifier">RP</span><span class="plain">[1]</span>
|
|
<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="reserved">property</span><span class="plain">-</span><span class="identifier">name</span><span class="plain">> | ==> </span><span class="functiontext"><a href="10-teav.html#SP11">ExParser::val</a></span><span class="plain">(</span><span class="identifier">RP</span><span class="plain">[1], </span><span class="identifier">W</span><span class="plain">)</span>
|
|
<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">action</span><span class="plain">-</span><span class="identifier">pattern</span><span class="plain">-</span><span class="identifier">as</span><span class="plain">-</span><span class="identifier">value</span><span class="plain">> | ==> </span><span class="functiontext"><a href="10-teav.html#SP11">ExParser::val</a></span><span class="plain">(</span><span class="identifier">RP</span><span class="plain">[1], </span><span class="identifier">W</span><span class="plain">)</span>
|
|
<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">value</span><span class="plain">-</span><span class="reserved">phrase</span><span class="plain">-</span><span class="identifier">non</span><span class="plain">-</span><span class="identifier">of</span><span class="plain">> | ==> </span><span class="functiontext"><a href="10-teav.html#SP11">ExParser::val</a></span><span class="plain">(</span><span class="identifier">RP</span><span class="plain">[1], </span><span class="identifier">W</span><span class="plain">)</span>
|
|
<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">adjective</span><span class="plain">-</span><span class="identifier">list</span><span class="plain">-</span><span class="identifier">as</span><span class="plain">-</span><span class="identifier">desc</span><span class="plain">> | ==> </span><span class="functiontext"><a href="10-teav.html#SP11">ExParser::val</a></span><span class="plain">(</span><span class="identifier">RP</span><span class="plain">[1], </span><span class="identifier">W</span><span class="plain">)</span>
|
|
<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">purely</span><span class="plain">-</span><span class="identifier">physical</span><span class="plain">-</span><span class="identifier">description</span><span class="plain">> | ==> </span><span class="functiontext"><a href="10-teav.html#SP11">ExParser::val</a></span><span class="plain">(</span><span class="identifier">RP</span><span class="plain">[1], </span><span class="identifier">W</span><span class="plain">)</span>
|
|
<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="reserved">table</span><span class="plain">-</span><span class="identifier">reference</span><span class="plain">> | ==> </span><span class="functiontext"><a href="10-teav.html#SP11">ExParser::val</a></span><span class="plain">(</span><span class="identifier">RP</span><span class="plain">[1], </span><span class="identifier">W</span><span class="plain">)</span>
|
|
<span class="identifier">member</span><span class="plain">/</span><span class="identifier">members</span><span class="plain"> </span><span class="identifier">of</span><span class="plain"> <</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">description</span><span class="plain">> | ==> </span><span class="functiontext"><a href="10-teav.html#SP11">ExParser::val</a></span><span class="plain">(</span><span class="identifier">RP</span><span class="plain">[1], </span><span class="identifier">W</span><span class="plain">)</span>
|
|
<span class="identifier">member</span><span class="plain">/</span><span class="identifier">members</span><span class="plain"> </span><span class="identifier">of</span><span class="plain"> <</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">local</span><span class="plain">-</span><span class="identifier">variable</span><span class="plain">> | ==> </span><span class="functiontext"><a href="10-teav.html#SP11">ExParser::val</a></span><span class="plain">(</span><span class="identifier">RP</span><span class="plain">[1], </span><span class="identifier">W</span><span class="plain">)</span>
|
|
<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="reserved">property</span><span class="plain">-</span><span class="identifier">name</span><span class="plain">> </span><span class="identifier">of</span><span class="plain"> <</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">value</span><span class="plain">-</span><span class="identifier">uncached</span><span class="plain">> | ==> </span><<span class="cwebmacro">Make a belonging-to-V property</span> <span class="cwebmacronumber">10.2</span>>
|
|
<span class="plain"><</span><span class="reserved">if</span><span class="plain">-</span><span class="identifier">pronoun</span><span class="plain">-</span><span class="identifier">present</span><span class="plain">> <</span><span class="identifier">possessive</span><span class="plain">-</span><span class="identifier">third</span><span class="plain">-</span><span class="identifier">person</span><span class="plain">> <</span><span class="identifier">s</span><span class="plain">-</span><span class="reserved">property</span><span class="plain">-</span><span class="identifier">name</span><span class="plain">> | ==> </span><<span class="cwebmacro">Make a belonging-to-it property</span> <span class="cwebmacronumber">10.1</span>>
|
|
<span class="identifier">entry</span><span class="plain"> <</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">value</span><span class="plain">-</span><span class="identifier">uncached</span><span class="plain">> </span><span class="identifier">of</span><span class="plain">/</span><span class="identifier">in</span><span class="plain">/</span><span class="identifier">from</span><span class="plain"> <</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">value</span><span class="plain">-</span><span class="identifier">uncached</span><span class="plain">> | ==> </span><<span class="cwebmacro">Make a list entry</span> <span class="cwebmacronumber">10.3</span>>
|
|
<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">description</span><span class="plain">> | ==> </span><span class="functiontext"><a href="10-teav.html#SP11">ExParser::val</a></span><span class="plain">(</span><span class="identifier">RP</span><span class="plain">[1], </span><span class="identifier">W</span><span class="plain">)</span>
|
|
<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="reserved">table</span><span class="plain">-</span><span class="identifier">column</span><span class="plain">-</span><span class="identifier">name</span><span class="plain">> | ==> </span><span class="functiontext"><a href="10-teav.html#SP11">ExParser::val</a></span><span class="plain">(</span><span class="identifier">RP</span><span class="plain">[1], </span><span class="identifier">W</span><span class="plain">)</span>
|
|
<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">value</span><span class="plain">-</span><span class="reserved">phrase</span><span class="plain">> ==> </span><span class="functiontext"><a href="10-teav.html#SP11">ExParser::val</a></span><span class="plain">(</span><span class="identifier">RP</span><span class="plain">[1], </span><span class="identifier">W</span><span class="plain">)</span>
|
|
</pre>
|
|
|
|
<p class="inwebparagraph"></p>
|
|
|
|
<p class="inwebparagraph"><a id="SP11"></a><b>§11. </b></p>
|
|
|
|
<pre class="display">
|
|
<span class="identifier">parse_node</span><span class="plain"> *</span><span class="functiontext">ExParser::val<button class="popup" onclick="togglePopup('usagePopup597')">...<span class="popuptext" id="usagePopup597">Usage of <b>ExParser::val</b>:<br><a href="10-teav.html#SP10">§10</a>, <a href="10-teav.html#SP12_1">§12.1</a>, <a href="10-teav.html#SP12_2">§12.2</a>, <a href="10-teav.html#SP12_3">§12.3</a>, <a href="10-teav.html#SP10_1">§10.1</a>, <a href="10-teav.html#SP10_2">§10.2</a>, <a href="10-teav.html#SP10_3">§10.3</a>, <a href="10-teav.html#SP14">§14</a>, Verbal and Relative Clauses - <a href="10-varc.html#SP7">§7</a></span></button></span><span class="plain">(</span><span class="identifier">parse_node</span><span class="plain"> *</span><span class="identifier">v</span><span class="plain">, </span><span class="identifier">wording</span><span class="plain"> </span><span class="identifier">W</span><span class="plain">) {</span>
|
|
<span class="identifier">ParseTree::set_text</span><span class="plain">(</span><span class="identifier">v</span><span class="plain">, </span><span class="identifier">W</span><span class="plain">);</span>
|
|
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">v</span><span class="plain">;</span>
|
|
<span class="plain">}</span>
|
|
</pre>
|
|
|
|
<p class="inwebparagraph"></p>
|
|
|
|
<p class="inwebparagraph"><a id="SP12"></a><b>§12. </b></p>
|
|
|
|
<pre class="display">
|
|
<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="reserved">equation</span><span class="plain">-</span><span class="identifier">usage</span><span class="plain">> ::=</span>
|
|
<span class="plain"><</span><span class="reserved">if</span><span class="plain">-</span><span class="identifier">let</span><span class="plain">-</span><span class="reserved">equation</span><span class="plain">-</span><span class="identifier">mode</span><span class="plain">> <</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">plain</span><span class="plain">-</span><span class="identifier">text</span><span class="plain">-</span><span class="identifier">with</span><span class="plain">-</span><span class="identifier">equals</span><span class="plain">> </span><span class="identifier">where</span><span class="plain"> <</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">plain</span><span class="plain">-</span><span class="identifier">text</span><span class="plain">> | ==> </span><<span class="cwebmacro">Make an equation</span> <span class="cwebmacronumber">12.1</span>>
|
|
<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">value</span><span class="plain">-</span><span class="identifier">uncached</span><span class="plain">> </span><span class="identifier">where</span><span class="plain"> <</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">plain</span><span class="plain">-</span><span class="identifier">text</span><span class="plain">> | ==> </span><<span class="cwebmacro">Make an equation, if the kinds are right</span> <span class="cwebmacronumber">12.2</span>>
|
|
<span class="plain"><</span><span class="reserved">if</span><span class="plain">-</span><span class="identifier">let</span><span class="plain">-</span><span class="reserved">equation</span><span class="plain">-</span><span class="identifier">mode</span><span class="plain">> <</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">plain</span><span class="plain">-</span><span class="identifier">text</span><span class="plain">-</span><span class="identifier">with</span><span class="plain">-</span><span class="identifier">equals</span><span class="plain">> ==> </span><<span class="cwebmacro">Make an inline equation</span> <span class="cwebmacronumber">12.3</span>>
|
|
</pre>
|
|
|
|
<p class="inwebparagraph"></p>
|
|
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<p class="inwebparagraph"><a id="SP12_1"></a><b>§12.1. </b><code class="display">
|
|
<<span class="cwebmacrodefn">Make an equation</span> <span class="cwebmacronumber">12.1</span>> =
|
|
</code></p>
|
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|
|
|
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<pre class="displaydefn">
|
|
<span class="reserved">equation</span><span class="plain"> *</span><span class="identifier">eqn</span><span class="plain"> = </span><span class="functiontext"><a href="20-eq.html#SP10_1">Equations::new</a></span><span class="plain">(</span><span class="identifier">ParseTree::get_text</span><span class="plain">((</span><span class="identifier">parse_node</span><span class="plain"> *) </span><span class="identifier">RP</span><span class="plain">[2]), </span><span class="identifier">TRUE</span><span class="plain">);</span>
|
|
<span class="identifier">parse_node</span><span class="plain"> *</span><span class="identifier">eq</span><span class="plain"> = </span><span class="functiontext"><a href="14-rv.html#SP1">Rvalues::from_equation</a></span><span class="plain">(</span><span class="identifier">eqn</span><span class="plain">);</span>
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|
<span class="functiontext"><a href="20-eq.html#SP11">Equations::set_wherewithal</a></span><span class="plain">(</span><span class="identifier">eqn</span><span class="plain">, </span><span class="identifier">ParseTree::get_text</span><span class="plain">((</span><span class="identifier">parse_node</span><span class="plain"> *) </span><span class="identifier">RP</span><span class="plain">[3]));</span>
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|
<span class="functiontext"><a href="20-eq.html#SP20">Equations::declare_local_variables</a></span><span class="plain">(</span><span class="identifier">eqn</span><span class="plain">);</span>
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|
<span class="functiontext"><a href="20-eq.html#SP13">Equations::examine</a></span><span class="plain">(</span><span class="identifier">eqn</span><span class="plain">);</span>
|
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<span class="plain">*</span><span class="identifier">XP</span><span class="plain"> = </span><span class="functiontext"><a href="10-teav.html#SP11">ExParser::val</a></span><span class="plain">(</span><span class="identifier">eq</span><span class="plain">, </span><span class="identifier">W</span><span class="plain">);</span>
|
|
</pre>
|
|
|
|
<p class="inwebparagraph"></p>
|
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|
|
<p class="endnote">This code is used in <a href="10-teav.html#SP12">§12</a>.</p>
|
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<p class="inwebparagraph"><a id="SP12_2"></a><b>§12.2. </b><code class="display">
|
|
<<span class="cwebmacrodefn">Make an equation, if the kinds are right</span> <span class="cwebmacronumber">12.2</span>> =
|
|
</code></p>
|
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|
|
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<pre class="displaydefn">
|
|
<span class="identifier">parse_node</span><span class="plain"> *</span><span class="identifier">p</span><span class="plain"> = </span><span class="identifier">RP</span><span class="plain">[1];</span>
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<span class="reserved">if</span><span class="plain"> (!(</span><span class="functiontext"><a href="14-rv.html#SP19">Rvalues::is_CONSTANT_of_kind</a></span><span class="plain">(</span><span class="identifier">p</span><span class="plain">, </span><span class="identifier">K_equation</span><span class="plain">))) </span><span class="reserved">return</span><span class="plain"> </span><span class="identifier">FALSE</span><span class="plain">;</span>
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<span class="identifier">parse_node</span><span class="plain"> *</span><span class="identifier">eq</span><span class="plain"> = </span><span class="identifier">p</span><span class="plain">;</span>
|
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<span class="reserved">equation</span><span class="plain"> *</span><span class="identifier">eqn</span><span class="plain"> = </span><span class="functiontext"><a href="14-rv.html#SP2">Rvalues::to_equation</a></span><span class="plain">(</span><span class="identifier">eq</span><span class="plain">);</span>
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|
<span class="functiontext"><a href="20-eq.html#SP45">Equations::set_usage_notes</a></span><span class="plain">(</span><span class="identifier">eqn</span><span class="plain">, </span><span class="identifier">ParseTree::get_text</span><span class="plain">((</span><span class="identifier">parse_node</span><span class="plain"> *) </span><span class="identifier">RP</span><span class="plain">[2]));</span>
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<span class="functiontext"><a href="20-eq.html#SP20">Equations::declare_local_variables</a></span><span class="plain">(</span><span class="identifier">eqn</span><span class="plain">);</span>
|
|
<span class="functiontext"><a href="20-eq.html#SP13">Equations::examine</a></span><span class="plain">(</span><span class="identifier">eqn</span><span class="plain">);</span>
|
|
<span class="plain">*</span><span class="identifier">XP</span><span class="plain"> = </span><span class="functiontext"><a href="10-teav.html#SP11">ExParser::val</a></span><span class="plain">(</span><span class="identifier">eq</span><span class="plain">, </span><span class="identifier">W</span><span class="plain">);</span>
|
|
</pre>
|
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<p class="inwebparagraph"></p>
|
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|
|
<p class="endnote">This code is used in <a href="10-teav.html#SP12">§12</a>.</p>
|
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<p class="inwebparagraph"><a id="SP12_3"></a><b>§12.3. </b><code class="display">
|
|
<<span class="cwebmacrodefn">Make an inline equation</span> <span class="cwebmacronumber">12.3</span>> =
|
|
</code></p>
|
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|
|
|
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<pre class="displaydefn">
|
|
<span class="reserved">equation</span><span class="plain"> *</span><span class="identifier">eqn</span><span class="plain"> = </span><span class="functiontext"><a href="20-eq.html#SP10_1">Equations::new</a></span><span class="plain">(</span><span class="identifier">ParseTree::get_text</span><span class="plain">((</span><span class="identifier">parse_node</span><span class="plain"> *) </span><span class="identifier">RP</span><span class="plain">[2]), </span><span class="identifier">TRUE</span><span class="plain">);</span>
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|
<span class="identifier">parse_node</span><span class="plain"> *</span><span class="identifier">eq</span><span class="plain"> = </span><span class="functiontext"><a href="14-rv.html#SP1">Rvalues::from_equation</a></span><span class="plain">(</span><span class="identifier">eqn</span><span class="plain">);</span>
|
|
<span class="functiontext"><a href="20-eq.html#SP20">Equations::declare_local_variables</a></span><span class="plain">(</span><span class="identifier">eqn</span><span class="plain">);</span>
|
|
<span class="functiontext"><a href="20-eq.html#SP13">Equations::examine</a></span><span class="plain">(</span><span class="identifier">eqn</span><span class="plain">);</span>
|
|
<span class="plain">*</span><span class="identifier">XP</span><span class="plain"> = </span><span class="functiontext"><a href="10-teav.html#SP11">ExParser::val</a></span><span class="plain">(</span><span class="identifier">eq</span><span class="plain">, </span><span class="identifier">W</span><span class="plain">);</span>
|
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|
|
</pre>
|
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|
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<p class="inwebparagraph"></p>
|
|
|
|
<p class="endnote">This code is used in <a href="10-teav.html#SP12">§12</a>.</p>
|
|
|
|
<p class="inwebparagraph"><a id="SP10_1"></a><b>§10.1. </b><code class="display">
|
|
<<span class="cwebmacrodefn">Make a belonging-to-it property</span> <span class="cwebmacronumber">10.1</span>> =
|
|
</code></p>
|
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|
|
|
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<pre class="displaydefn">
|
|
<span class="identifier">parse_node</span><span class="plain"> *</span><span class="identifier">lvspec</span><span class="plain"> =</span>
|
|
<span class="functiontext"><a href="14-lv.html#SP2">Lvalues::new_LOCAL_VARIABLE</a></span><span class="plain">(</span><span class="identifier">EMPTY_WORDING</span><span class="plain">,</span>
|
|
<span class="functiontext"><a href="24-lv.html#SP26">LocalVariables::it_variable</a></span><span class="plain">());</span>
|
|
<span class="identifier">parse_node</span><span class="plain"> *</span><span class="identifier">val</span><span class="plain"> = </span><span class="functiontext"><a href="10-teav.html#SP11">ExParser::val</a></span><span class="plain">(</span><span class="identifier">lvspec</span><span class="plain">, </span><span class="identifier">EMPTY_WORDING</span><span class="plain">);</span>
|
|
<span class="plain">*</span><span class="identifier">XP</span><span class="plain"> = </span><span class="functiontext"><a href="10-teav.html#SP11">ExParser::val</a></span><span class="plain">(</span><span class="functiontext"><a href="10-teav.html#SP13">ExParser::p_o_val</a></span><span class="plain">(</span><span class="identifier">RP</span><span class="plain">[3], </span><span class="identifier">val</span><span class="plain">), </span><span class="identifier">W</span><span class="plain">);</span>
|
|
</pre>
|
|
|
|
<p class="inwebparagraph"></p>
|
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|
|
<p class="endnote">This code is used in <a href="10-teav.html#SP10">§10</a>.</p>
|
|
|
|
<p class="inwebparagraph"><a id="SP10_2"></a><b>§10.2. </b><code class="display">
|
|
<<span class="cwebmacrodefn">Make a belonging-to-V property</span> <span class="cwebmacronumber">10.2</span>> =
|
|
</code></p>
|
|
|
|
|
|
<pre class="displaydefn">
|
|
<span class="plain">*</span><span class="identifier">XP</span><span class="plain"> = </span><span class="functiontext"><a href="10-teav.html#SP11">ExParser::val</a></span><span class="plain">(</span><span class="functiontext"><a href="10-teav.html#SP13">ExParser::p_o_val</a></span><span class="plain">(</span><span class="identifier">RP</span><span class="plain">[1], </span><span class="identifier">RP</span><span class="plain">[2]), </span><span class="identifier">W</span><span class="plain">);</span>
|
|
</pre>
|
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|
|
<p class="inwebparagraph"></p>
|
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|
|
<p class="endnote">This code is used in <a href="10-teav.html#SP10">§10</a>.</p>
|
|
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|
<p class="inwebparagraph"><a id="SP10_3"></a><b>§10.3. </b><code class="display">
|
|
<<span class="cwebmacrodefn">Make a list entry</span> <span class="cwebmacronumber">10.3</span>> =
|
|
</code></p>
|
|
|
|
|
|
<pre class="displaydefn">
|
|
<span class="identifier">parse_node</span><span class="plain"> *</span><span class="identifier">val</span><span class="plain"> = </span><span class="functiontext"><a href="14-lv.html#SP4">Lvalues::new_LIST_ENTRY</a></span><span class="plain">(</span><span class="identifier">RP</span><span class="plain">[2], </span><span class="identifier">RP</span><span class="plain">[1]);</span>
|
|
<span class="plain">*</span><span class="identifier">XP</span><span class="plain"> = </span><span class="functiontext"><a href="10-teav.html#SP11">ExParser::val</a></span><span class="plain">(</span><span class="identifier">val</span><span class="plain">, </span><span class="identifier">W</span><span class="plain">);</span>
|
|
</pre>
|
|
|
|
<p class="inwebparagraph"></p>
|
|
|
|
<p class="endnote">This code is used in <a href="10-teav.html#SP10">§10</a>.</p>
|
|
|
|
<p class="inwebparagraph"><a id="SP13"></a><b>§13. </b></p>
|
|
|
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<pre class="display">
|
|
<span class="identifier">parse_node</span><span class="plain"> *</span><span class="functiontext">ExParser::p_o_val<button class="popup" onclick="togglePopup('usagePopup598')">...<span class="popuptext" id="usagePopup598">Usage of <b>ExParser::p_o_val</b>:<br><a href="10-teav.html#SP10_1">§10.1</a>, <a href="10-teav.html#SP10_2">§10.2</a></span></button></span><span class="plain">(</span><span class="identifier">parse_node</span><span class="plain"> *</span><span class="identifier">A</span><span class="plain">, </span><span class="identifier">parse_node</span><span class="plain"> *</span><span class="identifier">B</span><span class="plain">) {</span>
|
|
<span class="identifier">parse_node</span><span class="plain"> *</span><span class="identifier">pts</span><span class="plain"> =</span>
|
|
<span class="plain">(</span><span class="identifier">ParseTree::get_type</span><span class="plain">(</span><span class="identifier">A</span><span class="plain">) == </span><span class="constant">UNKNOWN_NT</span><span class="plain">) ?</span>
|
|
<span class="functiontext"><a href="14-sp.html#SP8">Specifications::new_UNKNOWN</a></span><span class="plain">(</span><span class="identifier">ParseTree::get_text</span><span class="plain">(</span><span class="identifier">A</span><span class="plain">)) :</span>
|
|
<span class="identifier">A</span><span class="plain">;</span>
|
|
<span class="identifier">parse_node</span><span class="plain"> *</span><span class="identifier">vts</span><span class="plain"> = </span><span class="identifier">B</span><span class="plain">;</span>
|
|
<span class="identifier">parse_node</span><span class="plain"> *</span><span class="identifier">spec</span><span class="plain"> = </span><span class="functiontext"><a href="14-lv.html#SP5">Lvalues::new_PROPERTY_VALUE</a></span><span class="plain">(</span><span class="identifier">pts</span><span class="plain">, </span><span class="identifier">vts</span><span class="plain">);</span>
|
|
<span class="identifier">wording</span><span class="plain"> </span><span class="identifier">PW</span><span class="plain"> = </span><span class="identifier">ParseTree::get_text</span><span class="plain">(</span><span class="identifier">A</span><span class="plain">);</span>
|
|
<span class="identifier">wording</span><span class="plain"> </span><span class="identifier">VW</span><span class="plain"> = </span><span class="identifier">ParseTree::get_text</span><span class="plain">(</span><span class="identifier">B</span><span class="plain">);</span>
|
|
<span class="reserved">if</span><span class="plain"> ((</span><span class="identifier">Wordings::nonempty</span><span class="plain">(</span><span class="identifier">PW</span><span class="plain">)) && (</span><span class="identifier">Wordings::nonempty</span><span class="plain">(</span><span class="identifier">VW</span><span class="plain">))) {</span>
|
|
<span class="identifier">wording</span><span class="plain"> </span><span class="identifier">MW</span><span class="plain"> = </span><span class="identifier">PW</span><span class="plain">;</span>
|
|
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">Wordings::first_wn</span><span class="plain">(</span><span class="identifier">MW</span><span class="plain">) > </span><span class="identifier">Wordings::first_wn</span><span class="plain">(</span><span class="identifier">VW</span><span class="plain">))</span>
|
|
<span class="identifier">MW</span><span class="plain"> = </span><span class="identifier">Wordings::from</span><span class="plain">(</span><span class="identifier">MW</span><span class="plain">, </span><span class="identifier">Wordings::first_wn</span><span class="plain">(</span><span class="identifier">VW</span><span class="plain">));</span>
|
|
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">Wordings::last_wn</span><span class="plain">(</span><span class="identifier">MW</span><span class="plain">) < </span><span class="identifier">Wordings::last_wn</span><span class="plain">(</span><span class="identifier">VW</span><span class="plain">))</span>
|
|
<span class="identifier">MW</span><span class="plain"> = </span><span class="identifier">Wordings::up_to</span><span class="plain">(</span><span class="identifier">MW</span><span class="plain">, </span><span class="identifier">Wordings::last_wn</span><span class="plain">(</span><span class="identifier">VW</span><span class="plain">));</span>
|
|
<span class="identifier">ParseTree::set_text</span><span class="plain">(</span><span class="identifier">spec</span><span class="plain">, </span><span class="identifier">MW</span><span class="plain">);</span>
|
|
<span class="plain">}</span>
|
|
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">spec</span><span class="plain">;</span>
|
|
<span class="plain">}</span>
|
|
</pre>
|
|
|
|
<p class="inwebparagraph"></p>
|
|
|
|
<p class="inwebparagraph"><a id="SP14"></a><b>§14. Variables. </b>Internally there
|
|
are three sources of these: locals, defined by "let" or "repeat" phrases;
|
|
stacked 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="display">
|
|
<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">variable</span><span class="plain">> ::=</span>
|
|
<span class="plain"><</span><span class="identifier">definite</span><span class="plain">-</span><span class="identifier">article</span><span class="plain">> <</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">variable</span><span class="plain">> | ==> </span><span class="identifier">RP</span><span class="plain">[2]</span>
|
|
<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">local</span><span class="plain">-</span><span class="identifier">variable</span><span class="plain">> | ==> </span><span class="identifier">RP</span><span class="plain">[1]</span>
|
|
<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">stacked</span><span class="plain">-</span><span class="identifier">variable</span><span class="plain">> | ==> </span><span class="identifier">RP</span><span class="plain">[1]</span>
|
|
<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">global</span><span class="plain">-</span><span class="identifier">variable</span><span class="plain">> ==> </span><span class="identifier">RP</span><span class="plain">[1]</span>
|
|
|
|
<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">nonglobal</span><span class="plain">-</span><span class="identifier">variable</span><span class="plain">> ::=</span>
|
|
<span class="plain">( <</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">nonglobal</span><span class="plain">-</span><span class="identifier">variable</span><span class="plain">> ) | ==> </span><span class="identifier">RP</span><span class="plain">[1]</span>
|
|
<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">local</span><span class="plain">-</span><span class="identifier">variable</span><span class="plain">> | ==> </span><span class="functiontext"><a href="10-teav.html#SP11">ExParser::val</a></span><span class="plain">(</span><span class="identifier">RP</span><span class="plain">[1], </span><span class="identifier">W</span><span class="plain">)</span>
|
|
<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">stacked</span><span class="plain">-</span><span class="identifier">variable</span><span class="plain">> ==> </span><span class="functiontext"><a href="10-teav.html#SP11">ExParser::val</a></span><span class="plain">(</span><span class="identifier">RP</span><span class="plain">[1], </span><span class="identifier">W</span><span class="plain">)</span>
|
|
|
|
<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">variable</span><span class="plain">-</span><span class="identifier">as</span><span class="plain">-</span><span class="identifier">value</span><span class="plain">> ::=</span>
|
|
<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">variable</span><span class="plain">> ==> </span><span class="functiontext"><a href="10-teav.html#SP11">ExParser::val</a></span><span class="plain">(</span><span class="identifier">RP</span><span class="plain">[1], </span><span class="identifier">W</span><span class="plain">)</span>
|
|
</pre>
|
|
|
|
<p class="inwebparagraph"></p>
|
|
|
|
<p class="inwebparagraph"><a id="SP15"></a><b>§15. </b>This requires three internals:
|
|
</p>
|
|
|
|
<pre class="display">
|
|
<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">local</span><span class="plain">-</span><span class="identifier">variable</span><span class="plain">> </span><span class="identifier">internal</span><span class="plain"> {</span>
|
|
<span class="reserved">local_variable</span><span class="plain"> *</span><span class="identifier">lvar</span><span class="plain"> = </span><span class="functiontext"><a href="24-lv.html#SP24">LocalVariables::parse</a></span><span class="plain">(</span><span class="functiontext"><a href="24-sf.html#SP8">Frames::current_stack_frame</a></span><span class="plain">(), </span><span class="identifier">W</span><span class="plain">);</span>
|
|
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">lvar</span><span class="plain">) {</span>
|
|
<span class="identifier">parse_node</span><span class="plain"> *</span><span class="identifier">spec</span><span class="plain"> = </span><span class="functiontext"><a href="14-lv.html#SP2">Lvalues::new_LOCAL_VARIABLE</a></span><span class="plain">(</span><span class="identifier">W</span><span class="plain">, </span><span class="identifier">lvar</span><span class="plain">);</span>
|
|
<span class="plain">*</span><span class="identifier">XP</span><span class="plain"> = </span><span class="identifier">spec</span><span class="plain">; </span><span class="reserved">return</span><span class="plain"> </span><span class="identifier">TRUE</span><span class="plain">;</span>
|
|
<span class="plain">}</span>
|
|
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">FALSE</span><span class="plain">;</span>
|
|
<span class="plain">}</span>
|
|
</pre>
|
|
|
|
<p class="inwebparagraph"></p>
|
|
|
|
<p class="inwebparagraph"><a id="SP16"></a><b>§16. </b>And similarly:
|
|
</p>
|
|
|
|
<pre class="display">
|
|
<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">stacked</span><span class="plain">-</span><span class="identifier">variable</span><span class="plain">> </span><span class="identifier">internal</span><span class="plain"> {</span>
|
|
<span class="reserved">ph_stack_frame</span><span class="plain"> *</span><span class="identifier">phsf</span><span class="plain"> = </span><span class="functiontext"><a href="24-sf.html#SP8">Frames::current_stack_frame</a></span><span class="plain">();</span>
|
|
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">phsf</span><span class="plain"> == </span><span class="identifier">NULL</span><span class="plain">) </span><span class="reserved">return</span><span class="plain"> </span><span class="identifier">FALSE</span><span class="plain">;</span>
|
|
<span class="reserved">stacked_variable</span><span class="plain"> *</span><span class="identifier">stv</span><span class="plain"> = </span><span class="functiontext"><a href="21-sv.html#SP3">StackedVariables::parse_from_owner_list</a></span><span class="plain">(</span>
|
|
<span class="functiontext"><a href="24-sf.html#SP11">Frames::get_stvol</a></span><span class="plain">(), </span><span class="identifier">W</span><span class="plain">);</span>
|
|
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">stv</span><span class="plain">) {</span>
|
|
<span class="identifier">parse_node</span><span class="plain"> *</span><span class="identifier">spec</span><span class="plain"> = </span><span class="functiontext"><a href="14-lv.html#SP2">Lvalues::new_actual_NONLOCAL_VARIABLE</a></span><span class="plain">(</span>
|
|
<span class="functiontext"><a href="21-sv.html#SP3">StackedVariables::get_variable</a></span><span class="plain">(</span><span class="identifier">stv</span><span class="plain">));</span>
|
|
<span class="plain">*</span><span class="identifier">XP</span><span class="plain"> = </span><span class="identifier">spec</span><span class="plain">; </span><span class="reserved">return</span><span class="plain"> </span><span class="identifier">TRUE</span><span class="plain">;</span>
|
|
<span class="plain">}</span>
|
|
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">FALSE</span><span class="plain">;</span>
|
|
<span class="plain">}</span>
|
|
</pre>
|
|
|
|
<p class="inwebparagraph"></p>
|
|
|
|
<p class="inwebparagraph"><a id="SP17"></a><b>§17. </b>And:
|
|
</p>
|
|
|
|
<pre class="display">
|
|
<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">global</span><span class="plain">-</span><span class="identifier">variable</span><span class="plain">> </span><span class="identifier">internal</span><span class="plain"> {</span>
|
|
<span class="identifier">parse_node</span><span class="plain"> *</span><span class="identifier">p</span><span class="plain"> = </span><span class="identifier">ExParser::parse_excerpt</span><span class="plain">(</span><span class="constant">VARIABLE_MC</span><span class="plain">, </span><span class="identifier">W</span><span class="plain">);</span>
|
|
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">p</span><span class="plain">) { *</span><span class="identifier">XP</span><span class="plain"> = </span><span class="identifier">p</span><span class="plain">; </span><span class="reserved">return</span><span class="plain"> </span><span class="identifier">TRUE</span><span class="plain">; }</span>
|
|
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">FALSE</span><span class="plain">;</span>
|
|
<span class="plain">}</span>
|
|
</pre>
|
|
|
|
<p class="inwebparagraph"></p>
|
|
|
|
<p class="inwebparagraph"><a id="SP18"></a><b>§18. </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="display">
|
|
<span class="plain"><</span><span class="reserved">property</span><span class="plain">-</span><span class="identifier">of</span><span class="plain">-</span><span class="identifier">shape</span><span class="plain">> ::=</span>
|
|
<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="reserved">property</span><span class="plain">-</span><span class="identifier">name</span><span class="plain">> </span><span class="identifier">of</span><span class="plain"> ...</span>
|
|
</pre>
|
|
|
|
<p class="inwebparagraph"></p>
|
|
|
|
<p class="inwebparagraph"><a id="SP19"></a><b>§19. </b>We implement this by telling the excerpt parser, temporarily, not to match
|
|
anything including the word "of":
|
|
</p>
|
|
|
|
<pre class="display">
|
|
<span class="identifier">vocabulary_entry</span><span class="plain"> *</span><span class="identifier">property_word_to_suppress</span><span class="plain"> = </span><span class="identifier">NULL</span><span class="plain">;</span>
|
|
</pre>
|
|
|
|
<p class="inwebparagraph"></p>
|
|
|
|
<p class="inwebparagraph"><a id="SP20"></a><b>§20. </b>And here are the relevant internals:
|
|
</p>
|
|
|
|
<pre class="display">
|
|
<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">value</span><span class="plain">-</span><span class="reserved">phrase</span><span class="plain">-</span><span class="identifier">non</span><span class="plain">-</span><span class="identifier">of</span><span class="plain">> </span><span class="identifier">internal</span><span class="plain"> {</span>
|
|
<span class="identifier">W</span><span class="plain"> = </span><span class="identifier">Articles::remove_the</span><span class="plain">(</span><span class="identifier">W</span><span class="plain">);</span>
|
|
<span class="identifier">vocabulary_entry</span><span class="plain"> *</span><span class="identifier">suppression</span><span class="plain"> = </span><span class="identifier">word_to_suppress_in_phrases</span><span class="plain">;</span>
|
|
<span class="reserved">if</span><span class="plain"> (<</span><span class="reserved">property</span><span class="plain">-</span><span class="identifier">of</span><span class="plain">-</span><span class="identifier">shape</span><span class="plain">>(</span><span class="identifier">W</span><span class="plain">)) {</span>
|
|
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">property_word_to_suppress</span><span class="plain"> == </span><span class="identifier">NULL</span><span class="plain">)</span>
|
|
<span class="identifier">property_word_to_suppress</span><span class="plain"> = </span><span class="identifier">Preform::Nonparsing::word</span><span class="plain">(<</span><span class="reserved">property</span><span class="plain">-</span><span class="identifier">of</span><span class="plain">-</span><span class="identifier">shape</span><span class="plain">>, </span><span class="constant">0</span><span class="plain">);</span>
|
|
<span class="identifier">word_to_suppress_in_phrases</span><span class="plain"> = </span><span class="identifier">property_word_to_suppress</span><span class="plain">;</span>
|
|
<span class="plain">}</span>
|
|
<span class="identifier">parse_node</span><span class="plain"> *</span><span class="identifier">p</span><span class="plain"> = </span><span class="identifier">ExParser::parse_excerpt</span><span class="plain">(</span><span class="constant">VALUE_PHRASE_MC</span><span class="plain">, </span><span class="identifier">W</span><span class="plain">);</span>
|
|
<span class="identifier">word_to_suppress_in_phrases</span><span class="plain"> = </span><span class="identifier">suppression</span><span class="plain">;</span>
|
|
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">p</span><span class="plain">) {</span>
|
|
<span class="identifier">parse_node</span><span class="plain"> *</span><span class="identifier">spec</span><span class="plain"> = </span><span class="identifier">ParseTree::new_with_words</span><span class="plain">(</span><span class="constant">PHRASE_TO_DECIDE_VALUE_NT</span><span class="plain">, </span><span class="identifier">W</span><span class="plain">);</span>
|
|
<span class="functiontext"><a href="10-cap.html#SP12">ExParser::add_ilist</a></span><span class="plain">(</span><span class="identifier">spec</span><span class="plain">, </span><span class="identifier">p</span><span class="plain">);</span>
|
|
<span class="plain">*</span><span class="identifier">XP</span><span class="plain"> = </span><span class="identifier">spec</span><span class="plain">; </span><span class="reserved">return</span><span class="plain"> </span><span class="identifier">TRUE</span><span class="plain">;</span>
|
|
<span class="plain">}</span>
|
|
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">FALSE</span><span class="plain">;</span>
|
|
<span class="plain">}</span>
|
|
|
|
<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">value</span><span class="plain">-</span><span class="reserved">phrase</span><span class="plain">> </span><span class="identifier">internal</span><span class="plain"> {</span>
|
|
<span class="identifier">W</span><span class="plain"> = </span><span class="identifier">Articles::remove_the</span><span class="plain">(</span><span class="identifier">W</span><span class="plain">);</span>
|
|
<span class="identifier">parse_node</span><span class="plain"> *</span><span class="identifier">p</span><span class="plain"> = </span><span class="identifier">ExParser::parse_excerpt</span><span class="plain">(</span><span class="constant">VALUE_PHRASE_MC</span><span class="plain">, </span><span class="identifier">W</span><span class="plain">);</span>
|
|
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">p</span><span class="plain">) {</span>
|
|
<span class="identifier">parse_node</span><span class="plain"> *</span><span class="identifier">spec</span><span class="plain"> = </span><span class="identifier">ParseTree::new_with_words</span><span class="plain">(</span><span class="constant">PHRASE_TO_DECIDE_VALUE_NT</span><span class="plain">, </span><span class="identifier">W</span><span class="plain">);</span>
|
|
<span class="functiontext"><a href="10-cap.html#SP12">ExParser::add_ilist</a></span><span class="plain">(</span><span class="identifier">spec</span><span class="plain">, </span><span class="identifier">p</span><span class="plain">);</span>
|
|
<span class="plain">*</span><span class="identifier">XP</span><span class="plain"> = </span><span class="identifier">spec</span><span class="plain">; </span><span class="reserved">return</span><span class="plain"> </span><span class="identifier">TRUE</span><span class="plain">;</span>
|
|
<span class="plain">}</span>
|
|
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">FALSE</span><span class="plain">;</span>
|
|
<span class="plain">}</span>
|
|
</pre>
|
|
|
|
<p class="inwebparagraph"></p>
|
|
|
|
<p class="inwebparagraph"><a id="SP21"></a><b>§21. Table references. </b>Table references come in five different forms:
|
|
</p>
|
|
|
|
<p class="inwebparagraph"></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="display">
|
|
<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="reserved">table</span><span class="plain">-</span><span class="identifier">reference</span><span class="plain">> ::=</span>
|
|
<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="reserved">table</span><span class="plain">-</span><span class="identifier">column</span><span class="plain">-</span><span class="identifier">name</span><span class="plain">> </span><span class="identifier">entry</span><span class="plain"> | ==> </span><<span class="cwebmacro">Make table entry value</span> <span class="cwebmacronumber">21.1</span>>
|
|
<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="reserved">table</span><span class="plain">-</span><span class="identifier">column</span><span class="plain">-</span><span class="identifier">name</span><span class="plain">> </span><span class="identifier">in</span><span class="plain"> </span><span class="identifier">row</span><span class="plain"> <</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">value</span><span class="plain">-</span><span class="identifier">uncached</span><span class="plain">> </span><span class="identifier">of</span><span class="plain"> <</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">value</span><span class="plain">-</span><span class="identifier">uncached</span><span class="plain">> | ==> </span><<span class="cwebmacro">Make table in row of value</span> <span class="cwebmacronumber">21.2</span>>
|
|
<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="reserved">table</span><span class="plain">-</span><span class="identifier">column</span><span class="plain">-</span><span class="identifier">name</span><span class="plain">> </span><span class="identifier">listed</span><span class="plain"> </span><span class="identifier">in</span><span class="plain"> <</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">value</span><span class="plain">-</span><span class="identifier">uncached</span><span class="plain">> | ==> </span><<span class="cwebmacro">Make table listed in value</span> <span class="cwebmacronumber">21.3</span>>
|
|
<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="reserved">table</span><span class="plain">-</span><span class="identifier">column</span><span class="plain">-</span><span class="identifier">name</span><span class="plain">> </span><span class="identifier">corresponding</span><span class="plain"> </span><span class="identifier">to</span><span class="plain"> <</span><span class="identifier">s</span><span class="plain">-</span><span class="reserved">table</span><span class="plain">-</span><span class="identifier">column</span><span class="plain">-</span><span class="identifier">name</span><span class="plain">> </span><span class="identifier">of</span><span class="plain"> <</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">value</span><span class="plain">-</span><span class="identifier">uncached</span><span class="plain">> </span><span class="identifier">in</span><span class="plain"> <</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">value</span><span class="plain">-</span><span class="identifier">uncached</span><span class="plain">> | ==> </span><<span class="cwebmacro">Make table corresponding to value</span> <span class="cwebmacronumber">21.4</span>>
|
|
<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="reserved">table</span><span class="plain">-</span><span class="identifier">column</span><span class="plain">-</span><span class="identifier">name</span><span class="plain">> </span><span class="identifier">of</span><span class="plain"> <</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">value</span><span class="plain">-</span><span class="identifier">uncached</span><span class="plain">> </span><span class="identifier">in</span><span class="plain"> <</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">value</span><span class="plain">-</span><span class="identifier">uncached</span><span class="plain">> ==> </span><<span class="cwebmacro">Make table of in value</span> <span class="cwebmacronumber">21.5</span>>
|
|
</pre>
|
|
|
|
<p class="inwebparagraph"></p>
|
|
|
|
<p class="inwebparagraph"><a id="SP21_1"></a><b>§21.1. </b><code class="display">
|
|
<<span class="cwebmacrodefn">Make table entry value</span> <span class="cwebmacronumber">21.1</span>> =
|
|
</code></p>
|
|
|
|
|
|
<pre class="displaydefn">
|
|
<span class="identifier">parse_node</span><span class="plain"> *</span><span class="identifier">spec</span><span class="plain"> = </span><span class="functiontext"><a href="14-lv.html#SP3">Lvalues::new_TABLE_ENTRY</a></span><span class="plain">(</span><span class="identifier">W</span><span class="plain">);</span>
|
|
<span class="identifier">spec</span><span class="plain">-></span><span class="element">down</span><span class="plain"> = </span><span class="identifier">RP</span><span class="plain">[1];</span>
|
|
<span class="reserved">if</span><span class="plain"> ((</span><span class="functiontext"><a href="24-lv.html#SP22">LocalVariables::are_we_using_table_lookup</a></span><span class="plain">() == </span><span class="identifier">FALSE</span><span class="plain">) &&</span>
|
|
<span class="plain">(</span><span class="identifier">problem_count</span><span class="plain"> == </span><span class="constant">0</span><span class="plain">)) {</span>
|
|
<span class="identifier">Problems::Issue::sentence_problem</span><span class="plain">(</span><span class="functiontext"><a href="1-wtc.html#SP5">Task::syntax_tree</a></span><span class="plain">(), </span><span class="identifier">_p_</span><span class="plain">(</span><span class="identifier">PM_NoRowSelected</span><span class="plain">),</span>
|
|
<span class="string">"no row seems to have been chosen at this point"</span><span class="plain">,</span>
|
|
<span class="string">"so it doesn't make sense to talk about the entries "</span>
|
|
<span class="string">"within it. (By 'at this point', I mean the point "</span>
|
|
<span class="string">"when the table will have to be looked at. This "</span>
|
|
<span class="string">"might be at another time altogether if we are "</span>
|
|
<span class="string">"storing away instructions for later in a text "</span>
|
|
<span class="string">"substitution, e.g., writing 'now the description "</span>
|
|
<span class="string">"of the player is \"Thoroughly [vanity entry].\";' "</span>
|
|
<span class="string">"- remember that the substitution is acted on "</span>
|
|
<span class="string">"when the text is printed, which could be at any "</span>
|
|
<span class="string">"time, and no row will be chosen then.)"</span><span class="plain">);</span>
|
|
<span class="plain">}</span>
|
|
<span class="plain">*</span><span class="identifier">XP</span><span class="plain"> = </span><span class="identifier">spec</span><span class="plain">;</span>
|
|
</pre>
|
|
|
|
<p class="inwebparagraph"></p>
|
|
|
|
<p class="endnote">This code is used in <a href="10-teav.html#SP21">§21</a>.</p>
|
|
|
|
<p class="inwebparagraph"><a id="SP21_2"></a><b>§21.2. </b><code class="display">
|
|
<<span class="cwebmacrodefn">Make table in row of value</span> <span class="cwebmacronumber">21.2</span>> =
|
|
</code></p>
|
|
|
|
|
|
<pre class="displaydefn">
|
|
<span class="identifier">parse_node</span><span class="plain"> *</span><span class="identifier">spec</span><span class="plain"> = </span><span class="functiontext"><a href="14-lv.html#SP3">Lvalues::new_TABLE_ENTRY</a></span><span class="plain">(</span><span class="identifier">W</span><span class="plain">);</span>
|
|
<span class="identifier">spec</span><span class="plain">-></span><span class="element">down</span><span class="plain"> = </span><span class="functiontext"><a href="10-teav.html#SP22">ExParser::arg</a></span><span class="plain">(</span><span class="identifier">RP</span><span class="plain">[1]);</span>
|
|
<span class="identifier">spec</span><span class="plain">-></span><span class="element">down</span><span class="plain">-></span><span class="element">next</span><span class="plain"> = </span><span class="functiontext"><a href="10-teav.html#SP22">ExParser::arg</a></span><span class="plain">(</span><span class="identifier">RP</span><span class="plain">[2]);</span>
|
|
<span class="identifier">spec</span><span class="plain">-></span><span class="element">down</span><span class="plain">-></span><span class="element">next</span><span class="plain">-></span><span class="element">next</span><span class="plain"> = </span><span class="functiontext"><a href="10-teav.html#SP22">ExParser::arg</a></span><span class="plain">(</span><span class="identifier">RP</span><span class="plain">[3]);</span>
|
|
<span class="plain">*</span><span class="identifier">XP</span><span class="plain"> = </span><span class="identifier">spec</span><span class="plain">;</span>
|
|
</pre>
|
|
|
|
<p class="inwebparagraph"></p>
|
|
|
|
<p class="endnote">This code is used in <a href="10-teav.html#SP21">§21</a>.</p>
|
|
|
|
<p class="inwebparagraph"><a id="SP21_3"></a><b>§21.3. </b><code class="display">
|
|
<<span class="cwebmacrodefn">Make table listed in value</span> <span class="cwebmacronumber">21.3</span>> =
|
|
</code></p>
|
|
|
|
|
|
<pre class="displaydefn">
|
|
<span class="identifier">parse_node</span><span class="plain"> *</span><span class="identifier">spec</span><span class="plain"> = </span><span class="functiontext"><a href="14-lv.html#SP3">Lvalues::new_TABLE_ENTRY</a></span><span class="plain">(</span><span class="identifier">W</span><span class="plain">);</span>
|
|
<span class="identifier">spec</span><span class="plain">-></span><span class="element">down</span><span class="plain"> = </span><span class="functiontext"><a href="10-teav.html#SP22">ExParser::arg</a></span><span class="plain">(</span><span class="identifier">RP</span><span class="plain">[1]);</span>
|
|
<span class="identifier">spec</span><span class="plain">-></span><span class="element">down</span><span class="plain">-></span><span class="element">next</span><span class="plain"> = </span><span class="functiontext"><a href="10-teav.html#SP22">ExParser::arg</a></span><span class="plain">(</span><span class="identifier">RP</span><span class="plain">[2]);</span>
|
|
<span class="plain">*</span><span class="identifier">XP</span><span class="plain"> = </span><span class="identifier">spec</span><span class="plain">;</span>
|
|
</pre>
|
|
|
|
<p class="inwebparagraph"></p>
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<p class="endnote">This code is used in <a href="10-teav.html#SP21">§21</a>.</p>
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<p class="inwebparagraph"><a id="SP21_4"></a><b>§21.4. </b><code class="display">
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<<span class="cwebmacrodefn">Make table corresponding to value</span> <span class="cwebmacronumber">21.4</span>> =
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</code></p>
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<pre class="displaydefn">
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<span class="identifier">parse_node</span><span class="plain"> *</span><span class="identifier">spec</span><span class="plain"> = </span><span class="functiontext"><a href="14-lv.html#SP3">Lvalues::new_TABLE_ENTRY</a></span><span class="plain">(</span><span class="identifier">W</span><span class="plain">);</span>
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<span class="identifier">spec</span><span class="plain">-></span><span class="element">down</span><span class="plain"> = </span><span class="functiontext"><a href="10-teav.html#SP22">ExParser::arg</a></span><span class="plain">(</span><span class="identifier">RP</span><span class="plain">[1]);</span>
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<span class="identifier">spec</span><span class="plain">-></span><span class="element">down</span><span class="plain">-></span><span class="element">next</span><span class="plain"> = </span><span class="functiontext"><a href="10-teav.html#SP22">ExParser::arg</a></span><span class="plain">(</span><span class="identifier">RP</span><span class="plain">[2]);</span>
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<span class="identifier">spec</span><span class="plain">-></span><span class="element">down</span><span class="plain">-></span><span class="element">next</span><span class="plain">-></span><span class="element">next</span><span class="plain"> = </span><span class="functiontext"><a href="10-teav.html#SP22">ExParser::arg</a></span><span class="plain">(</span><span class="identifier">RP</span><span class="plain">[3]);</span>
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<span class="identifier">spec</span><span class="plain">-></span><span class="element">down</span><span class="plain">-></span><span class="element">next</span><span class="plain">-></span><span class="element">next</span><span class="plain">-></span><span class="element">next</span><span class="plain"> = </span><span class="functiontext"><a href="10-teav.html#SP22">ExParser::arg</a></span><span class="plain">(</span><span class="identifier">RP</span><span class="plain">[4]);</span>
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<span class="plain">*</span><span class="identifier">XP</span><span class="plain"> = </span><span class="identifier">spec</span><span class="plain">;</span>
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</pre>
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<p class="inwebparagraph"></p>
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<p class="endnote">This code is used in <a href="10-teav.html#SP21">§21</a>.</p>
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<p class="inwebparagraph"><a id="SP21_5"></a><b>§21.5. </b><code class="display">
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<<span class="cwebmacrodefn">Make table of in value</span> <span class="cwebmacronumber">21.5</span>> =
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</code></p>
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<pre class="displaydefn">
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<span class="identifier">parse_node</span><span class="plain"> *</span><span class="identifier">spec</span><span class="plain"> = </span><span class="functiontext"><a href="14-lv.html#SP3">Lvalues::new_TABLE_ENTRY</a></span><span class="plain">(</span><span class="identifier">W</span><span class="plain">);</span>
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<span class="identifier">spec</span><span class="plain">-></span><span class="element">down</span><span class="plain"> = </span><span class="functiontext"><a href="10-teav.html#SP22">ExParser::arg</a></span><span class="plain">(</span><span class="identifier">RP</span><span class="plain">[1]);</span>
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<span class="identifier">spec</span><span class="plain">-></span><span class="element">down</span><span class="plain">-></span><span class="element">next</span><span class="plain"> = </span><span class="functiontext"><a href="10-teav.html#SP22">ExParser::arg</a></span><span class="plain">(</span><span class="identifier">RP</span><span class="plain">[1]);</span>
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<span class="identifier">spec</span><span class="plain">-></span><span class="element">down</span><span class="plain">-></span><span class="element">next</span><span class="plain">-></span><span class="element">next</span><span class="plain"> = </span><span class="functiontext"><a href="10-teav.html#SP22">ExParser::arg</a></span><span class="plain">(</span><span class="identifier">RP</span><span class="plain">[2]);</span>
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<span class="identifier">spec</span><span class="plain">-></span><span class="element">down</span><span class="plain">-></span><span class="element">next</span><span class="plain">-></span><span class="element">next</span><span class="plain">-></span><span class="element">next</span><span class="plain"> = </span><span class="functiontext"><a href="10-teav.html#SP22">ExParser::arg</a></span><span class="plain">(</span><span class="identifier">RP</span><span class="plain">[3]);</span>
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<span class="plain">*</span><span class="identifier">XP</span><span class="plain"> = </span><span class="identifier">spec</span><span class="plain">;</span>
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</pre>
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<p class="inwebparagraph"></p>
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<p class="endnote">This code is used in <a href="10-teav.html#SP21">§21</a>.</p>
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<p class="inwebparagraph"><a id="SP22"></a><b>§22. </b></p>
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<pre class="display">
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<span class="identifier">parse_node</span><span class="plain"> *</span><span class="functiontext">ExParser::arg<button class="popup" onclick="togglePopup('usagePopup599')">...<span class="popuptext" id="usagePopup599">Usage of <b>ExParser::arg</b>:<br><a href="10-teav.html#SP21_2">§21.2</a>, <a href="10-teav.html#SP21_3">§21.3</a>, <a href="10-teav.html#SP21_4">§21.4</a>, <a href="10-teav.html#SP21_5">§21.5</a></span></button></span><span class="plain">(</span><span class="identifier">parse_node</span><span class="plain"> *</span><span class="identifier">val</span><span class="plain">) {</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">val</span><span class="plain"> == </span><span class="identifier">NULL</span><span class="plain">) </span><span class="reserved">return</span><span class="plain"> </span><span class="functiontext"><a href="14-sp.html#SP8">Specifications::new_UNKNOWN</a></span><span class="plain">(</span><span class="identifier">EMPTY_WORDING</span><span class="plain">);</span>
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<span class="reserved">return</span><span class="plain"> </span><span class="identifier">ParseTree::duplicate</span><span class="plain">(</span><span class="identifier">val</span><span class="plain">);</span>
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<span class="plain">}</span>
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</pre>
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<p class="inwebparagraph"></p>
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<p class="inwebparagraph"><a id="SP23"></a><b>§23. </b>Action patterns, such as "taking a container" or "opening a closed door",
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are parsed by code in the chapter on Actions; all we do here is to wrap the
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result.
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</p>
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<pre class="display">
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<span class="plain"><</span><span class="identifier">s</span><span class="plain">-</span><span class="identifier">action</span><span class="plain">-</span><span class="identifier">pattern</span><span class="plain">-</span><span class="identifier">as</span><span class="plain">-</span><span class="identifier">value</span><span class="plain">> </span><span class="identifier">internal</span><span class="plain"> {</span>
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<span class="plain">#</span><span class="identifier">ifdef</span><span class="plain"> </span><span class="identifier">IF_MODULE</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">Wordings::mismatched_brackets</span><span class="plain">(</span><span class="identifier">W</span><span class="plain">)) </span><span class="reserved">return</span><span class="plain"> </span><span class="identifier">FALSE</span><span class="plain">;</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">Lexer::word</span><span class="plain">(</span><span class="identifier">Wordings::first_wn</span><span class="plain">(</span><span class="identifier">W</span><span class="plain">)) == </span><span class="identifier">OPENBRACE_V</span><span class="plain">) </span><span class="reserved">return</span><span class="plain"> </span><span class="identifier">FALSE</span><span class="plain">;</span>
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<span class="reserved">int</span><span class="plain"> </span><span class="identifier">pto</span><span class="plain"> = </span><span class="identifier">permit_trying_omission</span><span class="plain">;</span>
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<span class="reserved">if</span><span class="plain"> (<</span><span class="identifier">definite</span><span class="plain">-</span><span class="identifier">article</span><span class="plain">>(</span><span class="identifier">Wordings::first_word</span><span class="plain">(</span><span class="identifier">W</span><span class="plain">)) == </span><span class="identifier">FALSE</span><span class="plain">) </span><span class="identifier">permit_trying_omission</span><span class="plain"> = </span><span class="identifier">TRUE</span><span class="plain">;</span>
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<span class="reserved">int</span><span class="plain"> </span><span class="identifier">r</span><span class="plain"> = <</span><span class="identifier">action</span><span class="plain">-</span><span class="identifier">pattern</span><span class="plain">>(</span><span class="identifier">W</span><span class="plain">);</span>
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<span class="identifier">permit_trying_omission</span><span class="plain"> = </span><span class="identifier">pto</span><span class="plain">;</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">r</span><span class="plain">) {</span>
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<span class="identifier">action_pattern</span><span class="plain"> *</span><span class="identifier">ap</span><span class="plain"> = <<</span><span class="identifier">rp</span><span class="plain">>>;</span>
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<span class="reserved">if</span><span class="plain"> ((</span><span class="identifier">ap</span><span class="plain">-></span><span class="identifier">actor_spec</span><span class="plain">) &&</span>
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<span class="plain">(</span><span class="functiontext"><a href="14-ds2.html#SP25">Dash::validate_parameter</a></span><span class="plain">(</span><span class="identifier">ap</span><span class="plain">-></span><span class="identifier">actor_spec</span><span class="plain">, </span><span class="identifier">K_person</span><span class="plain">) == </span><span class="identifier">FALSE</span><span class="plain">)) {</span>
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<span class="identifier">r</span><span class="plain"> = <</span><span class="identifier">action</span><span class="plain">-</span><span class="identifier">pattern</span><span class="plain">>(</span><span class="identifier">W</span><span class="plain">);</span>
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<span class="plain">}</span>
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<span class="plain">}</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">r</span><span class="plain">) {</span>
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<span class="plain">*</span><span class="identifier">XP</span><span class="plain"> = </span><span class="functiontext"><a href="14-cn.html#SP10">Conditions::new_TEST_ACTION</a></span><span class="plain">(<<</span><span class="identifier">rp</span><span class="plain">>>, </span><span class="identifier">W</span><span class="plain">);</span>
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<span class="reserved">return</span><span class="plain"> </span><span class="identifier">TRUE</span><span class="plain">;</span>
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<span class="plain">}</span>
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<span class="plain">#</span><span class="identifier">endif</span>
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<span class="reserved">return</span><span class="plain"> </span><span class="identifier">FALSE</span><span class="plain">;</span>
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<span class="plain">}</span>
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</pre>
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<p class="inwebparagraph"></p>
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<hr class="tocbar">
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