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<!-- Weave of 'Virtual Machine Grammar' generated by Inweb -->
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< ul class = "crumbs" > < li > < a href = "../index.html" > Home< / a > < / li > < li > < a href = "../compiler.html" > Inbuild Modules< / a > < / li > < li > < a href = "index.html" > supervisor< / a > < / li > < li > < a href = "index.html#6" > Chapter 6: Inform Source Text< / a > < / li > < li > < b > Virtual Machine Grammar< / b > < / li > < / ul > < / div >
< p class = "purpose" > Grammar for parsing natural language descriptions of a virtual machine.< / p >
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< p class = "commentary firstcommentary" > < a id = "SP1" > < / a > < b > § 1. < / b > This nonterminal corresponds to the Inbuild version number syntax in the
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arch module: for example, it matches < span class = "extract" > < span class = "extract-syntax" > 2.7.6< / span > < / span > or < span class = "extract" > < span class = "extract-syntax" > 3/990505< / span > < / span > . A bit
awkwardly, because a semantic version number is stored as an actual < span class = "extract" > < span class = "extract-syntax" > struct< / span > < / span >
rather than being created on the heap as an object: so we can't make the
return value of this nonterminal a pointer to that < span class = "extract" > < span class = "extract-syntax" > struct< / span > < / span > , as that would be
out of scope when needed. Instead, we have to wrap it up in a holder object
to give it permanency.
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< / p >
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< pre class = "Preform-displayed-code all-displayed-code code-font" >
< span class = "Preform-function-syntax" > < version-number> < / 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" > 1< / span > < span class = "Preform-plain-syntax" > < / span > < span class = "Preform-constant-syntax" > {< / span >
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< span class = "Preform-plain-syntax" > < / span > < span class = "Preform-identifier-syntax" > TEMPORARY_TEXT< / span > < span class = "Preform-plain-syntax" > (< / span > < span class = "Preform-identifier-syntax" > vtext< / span > < span class = "Preform-plain-syntax" > )< / span >
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< span class = "Preform-plain-syntax" > < / span > < span class = "Preform-identifier-syntax" > WRITE_TO< / span > < span class = "Preform-plain-syntax" > (< / span > < span class = "Preform-identifier-syntax" > vtext< / span > < span class = "Preform-plain-syntax" > , < / span > < span class = "Preform-string-syntax" > "%W"< / 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" > semantic_version_number< / span > < span class = "Preform-plain-syntax" > < / span > < span class = "Preform-identifier-syntax" > V< / span > < span class = "Preform-plain-syntax" > = < / span > < span class = "Preform-identifier-syntax" > VersionNumbers::from_text< / span > < span class = "Preform-plain-syntax" > (< / span > < span class = "Preform-identifier-syntax" > vtext< / span > < span class = "Preform-plain-syntax" > );< / span >
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< span class = "Preform-plain-syntax" > < / span > < span class = "Preform-identifier-syntax" > DISCARD_TEXT< / span > < span class = "Preform-plain-syntax" > (< / span > < span class = "Preform-identifier-syntax" > vtext< / span > < span class = "Preform-plain-syntax" > )< / span >
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< span class = "Preform-plain-syntax" > < / span > < span class = "Preform-reserved-syntax" > if< / span > < span class = "Preform-plain-syntax" > (< / span > < span class = "Preform-identifier-syntax" > VersionNumbers::is_null< / span > < span class = "Preform-plain-syntax" > (< / span > < span class = "Preform-identifier-syntax" > V< / span > < span class = "Preform-plain-syntax" > ) == < / span > < span class = "Preform-identifier-syntax" > FALSE< / span > < span class = "Preform-plain-syntax" > ) {< / span >
< span class = "Preform-plain-syntax" > < / span > < span class = "Preform-identifier-syntax" > semantic_version_number_holder< / span > < span class = "Preform-plain-syntax" > *< / span > < span class = "Preform-identifier-syntax" > H< / span > < span class = "Preform-plain-syntax" > = < / span > < span class = "Preform-identifier-syntax" > CREATE< / span > < span class = "Preform-plain-syntax" > (< / span > < span class = "Preform-identifier-syntax" > semantic_version_number_holder< / span > < span class = "Preform-plain-syntax" > );< / span >
< span class = "Preform-plain-syntax" > < / span > < span class = "Preform-identifier-syntax" > H< / span > < span class = "Preform-plain-syntax" > -> < / span > < span class = "Preform-identifier-syntax" > version< / span > < span class = "Preform-plain-syntax" > = < / span > < span class = "Preform-identifier-syntax" > V< / span > < span class = "Preform-plain-syntax" > ;< / span >
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< span class = "Preform-plain-syntax" > ==> { -, < / span > < span class = "Preform-identifier-syntax" > H< / 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 >
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< span class = "Preform-plain-syntax" > }< / span >
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< span class = "Preform-plain-syntax" > ==> { < / span > < span class = "Preform-identifier-syntax" > fail< / span > < span class = "Preform-plain-syntax" > < / span > < span class = "Preform-identifier-syntax" > nonterminal< / span > < span class = "Preform-plain-syntax" > };< / span >
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< span class = "Preform-plain-syntax" > }< / span >
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< / pre >
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< ul class = "endnotetexts" > < li > This is < a href = "../words-module/4-ap.html" class = "internal" > Preform grammar< / a > , not regular C code.< / li > < / ul >
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< p class = "commentary firstcommentary" > < a id = "SP2" > < / a > < b > § 2. < / b > The following nonterminal matches any valid description of a virtual machine.
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< / p >
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< pre class = "Preform-displayed-code all-displayed-code code-font" >
< span class = "Preform-function-syntax" > < virtual-machine> < / span > < span class = "Preform-plain-syntax" > < / span > < span class = "Preform-constant-syntax" > internal< / span > < span class = "Preform-plain-syntax" > < / span > < span class = "Preform-constant-syntax" > {< / span >
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< span class = "Preform-plain-syntax" > < / span > < span class = "Preform-identifier-syntax" > TEMPORARY_TEXT< / span > < span class = "Preform-plain-syntax" > (< / span > < span class = "Preform-identifier-syntax" > vtext< / span > < span class = "Preform-plain-syntax" > )< / span >
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< span class = "Preform-plain-syntax" > < / span > < span class = "Preform-identifier-syntax" > WRITE_TO< / span > < span class = "Preform-plain-syntax" > (< / span > < span class = "Preform-identifier-syntax" > vtext< / span > < span class = "Preform-plain-syntax" > , < / span > < span class = "Preform-string-syntax" > "%W"< / 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" > compatibility_specification< / span > < span class = "Preform-plain-syntax" > *< / span > < span class = "Preform-identifier-syntax" > C< / span > < span class = "Preform-plain-syntax" > = < / span > < span class = "Preform-identifier-syntax" > Compatibility::from_text< / span > < span class = "Preform-plain-syntax" > (< / span > < span class = "Preform-identifier-syntax" > vtext< / span > < span class = "Preform-plain-syntax" > );< / span >
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< span class = "Preform-plain-syntax" > < / span > < span class = "Preform-identifier-syntax" > DISCARD_TEXT< / span > < span class = "Preform-plain-syntax" > (< / span > < span class = "Preform-identifier-syntax" > vtext< / 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" > C< / span > < span class = "Preform-plain-syntax" > ) {< / span >
< span class = "Preform-plain-syntax" > ==> { -, < / span > < span class = "Preform-identifier-syntax" > C< / 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 >
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< span class = "Preform-plain-syntax" > }< / span >
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< / pre >
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< ul class = "endnotetexts" > < li > This is < a href = "../words-module/4-ap.html" class = "internal" > Preform grammar< / a > , not regular C code.< / li > < / ul >
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