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< ul class = "crumbs" > < li > < a href = "../index.html" > Home< / a > < / li > < li > < a href = "../compiler.html" > Inform7< / a > < / li > < li > < a href = "index.html" > knowledge< / a > < / li > < li > < a href = "index.html#2" > Chapter 2: Instances and Variables< / a > < / li > < li > < b > Preform for Instances< / b > < / li > < / ul > < / div >
< p class = "purpose" > To manage constant values of enumerated kinds or kinds of object.< / p >
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< p class = "commentary firstcommentary" > < a id = "SP1" class = "paragraph-anchor" > < / a > < b > § 1. < / b > The first internal matches only instances of kinds within the objects;
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the second matches the others; and the third all instances, of whatever kind.
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Note that the return pointer from these nonterminals is to < span class = "extract" > < span class = "extract-syntax" > instance< / span > < / span > , not
to a < span class = "extract" > < span class = "extract-syntax" > parse_node< / span > < / span > holding a specification, as with the S-parser.
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< / p >
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< pre class = "Preform-displayed-code all-displayed-code code-font" >
< span class = "Preform-function-syntax" > < instance-of-object> < / span > < span class = "Preform-plain-syntax" > < / span > < span class = "Preform-constant-syntax" > internal< / span > < span class = "Preform-plain-syntax" > < / span > < span class = "Preform-constant-syntax" > {< / span >
< span class = "Preform-plain-syntax" > < / span > < span class = "Preform-identifier-syntax" > W< / span > < span class = "Preform-plain-syntax" > = < / span > < span class = "Preform-identifier-syntax" > Articles::remove_the< / span > < span class = "Preform-plain-syntax" > (< / span > < span class = "Preform-identifier-syntax" > W< / span > < span class = "Preform-plain-syntax" > );< / span >
< span class = "Preform-plain-syntax" > < / span > < span class = "Preform-reserved-syntax" > if< / span > < span class = "Preform-plain-syntax" > (< / span > < span class = "Preform-function-syntax" > < s-object-instance> < / span > < span class = "Preform-plain-syntax" > (< / span > < span class = "Preform-identifier-syntax" > W< / span > < span class = "Preform-plain-syntax" > )) {< / span >
< span class = "Preform-plain-syntax" > ==> { -, < / span > < span class = "Preform-identifier-syntax" > Rvalues::to_instance< / span > < span class = "Preform-plain-syntax" > (< / span > < span class = "Preform-function-syntax" > < < rp> > < / span > < span class = "Preform-plain-syntax" > ) };< / span >
< span class = "Preform-plain-syntax" > < / span > < span class = "Preform-reserved-syntax" > return< / span > < span class = "Preform-plain-syntax" > < / span > < span class = "Preform-identifier-syntax" > TRUE< / span > < span class = "Preform-plain-syntax" > ;< / span >
< span class = "Preform-plain-syntax" > }< / span >
< span class = "Preform-plain-syntax" > ==> { < / span > < span class = "Preform-identifier-syntax" > fail< / span > < span class = "Preform-plain-syntax" > < / span > < span class = "Preform-identifier-syntax" > nonterminal< / span > < span class = "Preform-plain-syntax" > };< / span >
< span class = "Preform-plain-syntax" > }< / span >
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< span class = "Preform-function-syntax" > < instance-of-non-object> < / span > < span class = "Preform-plain-syntax" > < / span > < span class = "Preform-constant-syntax" > internal< / span > < span class = "Preform-plain-syntax" > < / span > < span class = "Preform-constant-syntax" > {< / span >
< span class = "Preform-plain-syntax" > < / span > < span class = "Preform-identifier-syntax" > W< / span > < span class = "Preform-plain-syntax" > = < / span > < span class = "Preform-identifier-syntax" > Articles::remove_the< / span > < span class = "Preform-plain-syntax" > (< / span > < span class = "Preform-identifier-syntax" > W< / span > < span class = "Preform-plain-syntax" > );< / span >
< span class = "Preform-plain-syntax" > < / span > < span class = "Preform-identifier-syntax" > parse_node< / span > < span class = "Preform-plain-syntax" > *< / span > < span class = "Preform-identifier-syntax" > p< / span > < span class = "Preform-plain-syntax" > = < / span > < span class = "Preform-identifier-syntax" > Lexicon::retrieve< / span > < span class = "Preform-plain-syntax" > (< / span > < span class = "Preform-identifier-syntax" > NAMED_CONSTANT_MC< / span > < span class = "Preform-plain-syntax" > , < / span > < span class = "Preform-identifier-syntax" > W< / span > < span class = "Preform-plain-syntax" > );< / span >
< span class = "Preform-plain-syntax" > < / span > < span class = "Preform-reserved-syntax" > instance< / span > < span class = "Preform-plain-syntax" > *< / span > < span class = "Preform-identifier-syntax" > I< / span > < span class = "Preform-plain-syntax" > = < / span > < span class = "Preform-identifier-syntax" > Rvalues::to_instance< / span > < span class = "Preform-plain-syntax" > (< / span > < span class = "Preform-identifier-syntax" > p< / span > < span class = "Preform-plain-syntax" > );< / span >
< span class = "Preform-plain-syntax" > < / span > < span class = "Preform-reserved-syntax" > if< / span > < span class = "Preform-plain-syntax" > (< / span > < span class = "Preform-identifier-syntax" > I< / span > < span class = "Preform-plain-syntax" > ) {< / span >
< span class = "Preform-plain-syntax" > ==> { -, < / span > < span class = "Preform-identifier-syntax" > I< / span > < span class = "Preform-plain-syntax" > }; < / span > < span class = "Preform-reserved-syntax" > return< / span > < span class = "Preform-plain-syntax" > < / span > < span class = "Preform-identifier-syntax" > TRUE< / span > < span class = "Preform-plain-syntax" > ;< / span >
< span class = "Preform-plain-syntax" > }< / span >
< span class = "Preform-plain-syntax" > ==> { < / span > < span class = "Preform-identifier-syntax" > fail< / span > < span class = "Preform-plain-syntax" > < / span > < span class = "Preform-identifier-syntax" > nonterminal< / span > < span class = "Preform-plain-syntax" > };< / span >
< span class = "Preform-plain-syntax" > }< / span >
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< span class = "Preform-function-syntax" > < instance> < / span > < span class = "Preform-plain-syntax" > < / span > < span class = "Preform-reserved-syntax" > ::=< / span >
< span class = "Preform-plain-syntax" > < / span > < span class = "Preform-function-syntax" > < instance-of-object> < / span > < span class = "Preform-plain-syntax" > < / span > < span class = "Preform-reserved-syntax" > |< / span > < span class = "Preform-plain-syntax" > < / span > < span class = "Preform-reserved-syntax" > ==> < / span > < span class = "Preform-plain-syntax" > { pass 1 }< / span >
< span class = "Preform-plain-syntax" > < / span > < span class = "Preform-function-syntax" > < instance-of-non-object> < / span > < span class = "Preform-plain-syntax" > < / span > < span class = "Preform-reserved-syntax" > ==> < / span > < span class = "Preform-plain-syntax" > { pass 1 }< / span >
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< / pre >
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< ul class = "endnotetexts" > < li > This is < a href = "../words-module/4-ap.html" class = "internal" > Preform grammar< / a > , not regular C code.< / li > < / ul >
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