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<!-- Weave of 'The Version Construct' generated by Inweb -->
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< ul class = "crumbs" > < li > < a href = "../index.html" > Home< / a > < / li > < li > < a href = "../compiler.html" > Inter Modules< / a > < / li > < li > < a href = "index.html" > bytecode< / a > < / li > < li > < a href = "index.html#6" > Chapter 6: Pseudo-Constructs< / a > < / li > < li > < b > The Version Construct< / b > < / li > < / ul > < / div >
< p class = "purpose" > Defining the version construct.< / p >
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< p class = "commentary firstcommentary" > < a id = "SP1" class = "paragraph-anchor" > < / a > < b > § 1. < / b > This is a pseudo-construct: it looks like an instruction in textual Inter
syntax, but specifies something else, and does not result in an < span class = "extract" > < span class = "extract-syntax" > inter_tree_node< / span > < / span > .
< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > VersionInstruction::define_construct< / span > < button class = "popup" onclick = "togglePopup('usagePopup1')" > < span class = "comment-syntax" > ?< / span > < span class = "popuptext" id = "usagePopup1" > Usage of < span class = "code-font" > < span class = "function-syntax" > VersionInstruction::define_construct< / span > < / span > :< br / > Inter Constructs - < a href = "3-ic.html#SP15" > § 15< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > inter_construct< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > IC< / span > < span class = "plain-syntax" > = < / span > < a href = "3-ic.html#SP1" class = "function-link" > < span class = "function-syntax" > InterInstruction::create_construct< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "constant-syntax" > VERSION_IST< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > I< / span > < span class = "string-syntax" > "version"< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < a href = "3-ic.html#SP8" class = "function-link" > < span class = "function-syntax" > InterInstruction::specify_syntax< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > IC< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > I< / span > < span class = "string-syntax" > "version TOKEN"< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < a href = "3-ic.html#SP3" class = "function-link" > < span class = "function-syntax" > InterInstruction::permit< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > IC< / span > < span class = "plain-syntax" > , < / span > < span class = "constant-syntax" > OUTSIDE_OF_PACKAGES_ICUP< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > METHOD_ADD< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > IC< / span > < span class = "plain-syntax" > , < / span > < span class = "constant-syntax" > CONSTRUCT_READ_MTID< / span > < span class = "plain-syntax" > , < / span > < a href = "6-tvc.html#SP2" class = "function-link" > < span class = "function-syntax" > VersionInstruction::read< / span > < / a > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > METHOD_ADD< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > IC< / span > < span class = "plain-syntax" > , < / span > < span class = "constant-syntax" > CONSTRUCT_VERIFY_MTID< / span > < span class = "plain-syntax" > , < / span > < a href = "6-tvc.html#SP1" class = "function-link" > < span class = "function-syntax" > VersionInstruction::verify< / span > < / a > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > }< / span >
< span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > VersionInstruction::verify< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > inter_construct< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > IC< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > inter_tree_node< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > P< / span > < span class = "plain-syntax" > ,< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > inter_package< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > owner< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > inter_error_message< / span > < span class = "plain-syntax" > **< / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > = < / span > < a href = "2-in.html#SP15" class = "function-link" > < span class = "function-syntax" > Inode::error< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > P< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > I< / span > < span class = "string-syntax" > "VERSION_IST structures cannot exist"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > }< / span >
< / pre >
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< p class = "commentary firstcommentary" > < a id = "SP2" class = "paragraph-anchor" > < / a > < b > § 2. < / b > What it does is to specify the version of the Inter language used in the file
of textual Inter being read in. Now, we can only read a version compatible with
the version we use ourselves: so we throw an error if it is not.
< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > VersionInstruction::read< / span > < button class = "popup" onclick = "togglePopup('usagePopup2')" > < span class = "comment-syntax" > ?< / span > < span class = "popuptext" id = "usagePopup2" > Usage of < span class = "code-font" > < span class = "function-syntax" > VersionInstruction::read< / span > < / span > :< br / > < a href = "6-tvc.html#SP1" > § 1< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > inter_construct< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > IC< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > inter_bookmark< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > IBM< / span > < span class = "plain-syntax" > ,< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > inter_line_parse< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > ilp< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > inter_error_location< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > eloc< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > inter_error_message< / span > < span class = "plain-syntax" > **< / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > semantic_version_number< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > file_version< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > VersionNumbers::from_text< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > ilp< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > mr< / span > < span class = "plain-syntax" > .< / span > < span class = "identifier-syntax" > exp< / span > < span class = "plain-syntax" > [0]);< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < a href = "1-tiv.html#SP1" class = "function-link" > < span class = "function-syntax" > InterVersion::check_readable< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > file_version< / 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" > semantic_version_number< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > current_version< / span > < span class = "plain-syntax" > = < / span > < a href = "1-tiv.html#SP1" class = "function-link" > < span class = "function-syntax" > InterVersion::current< / span > < / a > < span class = "plain-syntax" > ();< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > text_stream< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > erm< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > Str::new< / 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" > erm< / span > < span class = "plain-syntax" > ,< / span >
< span class = "plain-syntax" > < / span > < span class = "string-syntax" > "file holds Inter written for specification v%v, but I expect v%v"< / span > < span class = "plain-syntax" > ,< / span >
< span class = "plain-syntax" > & < / span > < span class = "identifier-syntax" > file_version< / span > < span class = "plain-syntax" > , & < / span > < span class = "identifier-syntax" > current_version< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > = < / span > < a href = "3-ie.html#SP4" class = "function-link" > < span class = "function-syntax" > InterErrors::plain< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > erm< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > eloc< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > }< / span >
< / pre >
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