compiler/PPTokenizingCompiledParser.st
author Jan Vrany <jan.vrany@fit.cvut.cz>
Fri, 24 Jul 2015 15:37:23 +0100
changeset 503 ff58cd9f1f3c
parent 502 1e45d3c96ec5
child 515 b5316ef15274
permissions -rw-r--r--
Merge
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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"{ Package: 'stx:goodies/petitparser/compiler' }"
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"{ NameSpace: Smalltalk }"
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PPCompiledParser subclass:#PPTokenizingCompiledParser
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	instanceVariableNames:'currentTokenValue currentTokenType scanner'
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	classVariableNames:''
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	poolDictionaries:''
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	category:'PetitCompiler-Parsers'
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!
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!PPTokenizingCompiledParser methodsFor:'tokenizing'!
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consume: tokenType
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    self halt: 'deprecated'.
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    (self perform: tokenType) ifTrue: [ 
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        currentTokenType := nil.
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        ^ currentTokenValue.
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    ].	
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    "self error: 'expected: ', tokenType storeString, ' got ', currentTokenType storeString."
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    self error.
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!
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consumeWhitespace
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    self shouldBeImplemented 
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!
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currentTokenType
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    currentTokenType isNil ifTrue: [ self nextToken ].
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    ^ currentTokenType
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!
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currentTokenTypeIs: tokenType
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    "if the type is read"
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    self halt: 'deprecated'.
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    currentTokenType isNil ifFalse: [ ^ currentTokenType = tokenType ].
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    "if not, try to read the token"
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    ^ self perform: tokenType.
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!
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currentTokenValue
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    currentTokenType isNil ifTrue: [ self nextToken ].
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    ^ currentTokenType
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!
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nextToken
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    self shouldBeImplemented 
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!
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parseOn: aPPContext
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    | retval |
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    context := aPPContext.
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    context compiledParser: self.
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    failure := PPFailure new message: nil; context: context; position: -1.
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    context noteFailure: failure.
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    error := false.
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    currentTokenType := nil.
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    scanner := PPCScanner new.
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    self consumeWhitespace.
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    retval := self perform: startSymbol.
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"	self consumeWhitespace."
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    (retval isPetitFailure) ifTrue: [ aPPContext noteFailure: failure ].
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    error ifTrue: [ aPPContext noteFailure: failure. retval := failure ].
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"	aPPContext position: context position."
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    ^ retval
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! !
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