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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
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 > .
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< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
< span class = "plain-syntax" > < < / span > < span class = "identifier-syntax" > version< / span > < span class = "plain-syntax" > -< / span > < span class = "identifier-syntax" > number< / span > < span class = "plain-syntax" > > < / span > < span class = "identifier-syntax" > internal< / span > < span class = "plain-syntax" > < / span > < span class = "constant-syntax" > 1< / span > < span class = "plain-syntax" > {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > TEMPORARY_TEXT< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > vtext< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > WRITE_TO< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > vtext< / span > < span class = "plain-syntax" > , < / span > < span class = "string-syntax" > "%W"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > W< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > semantic_version_number< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > V< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > VersionNumbers::from_text< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > vtext< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > result< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > FALSE< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > VersionNumbers::is_null< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > V< / span > < span class = "plain-syntax" > ) == < / span > < span class = "identifier-syntax" > FALSE< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > result< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > TRUE< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > semantic_version_number_holder< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > H< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > CREATE< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > semantic_version_number_holder< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > H< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > version< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > V< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > XP< / span > < span class = "plain-syntax" > = (< / span > < span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > *) < / span > < span class = "identifier-syntax" > H< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > DISCARD_TEXT< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > vtext< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > result< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
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< / pre >
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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,
with result < span class = "extract" > < span class = "extract-syntax" > TRUE< / span > < / span > if the current target VM matches that description and
< span class = "extract" > < span class = "extract-syntax" > FALSE< / span > < / span > if not.
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< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
< span class = "plain-syntax" > < < / span > < span class = "identifier-syntax" > virtual< / span > < span class = "plain-syntax" > -< / span > < span class = "identifier-syntax" > machine< / span > < span class = "plain-syntax" > > < / span > < span class = "identifier-syntax" > internal< / span > < span class = "plain-syntax" > {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > TEMPORARY_TEXT< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > vtext< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > WRITE_TO< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > vtext< / span > < span class = "plain-syntax" > , < / span > < span class = "string-syntax" > "%W"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > W< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > compatibility_specification< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > C< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > Compatibility::from_text< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > vtext< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > C< / span > < span class = "plain-syntax" > ) { *< / span > < span class = "identifier-syntax" > XP< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > C< / span > < span class = "plain-syntax" > ; < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > TRUE< / span > < span class = "plain-syntax" > ; }< / span >
< span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > XP< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ; < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > FALSE< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
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< / pre >
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