"{ Package: 'stx:goodies/petitparser/compiler' }"

"{ NameSpace: Smalltalk }"

PPCNodeVisitor subclass:#PPCCodeGenerator

	instanceVariableNames:'compiler'

	classVariableNames:''

	poolDictionaries:''

	category:'PetitCompiler-Visitors'

!

!PPCCodeGenerator class methodsFor:'as yet unclassified'!

on: aPPCCompiler

    ^ self new 

        compiler: aPPCCompiler;

        yourself

! !

!PPCCodeGenerator methodsFor:'accessing'!

compiler: aPPCCompiler

    compiler := aPPCCompiler 

! !

!PPCCodeGenerator methodsFor:'hooks'!

afterAccept: node retval: retval

    "return the method from compiler"

    ^ self stopMethodForNode: node.

!

beforeAccept: node

    self startMethodForNode: node

!

closedDetected: node

    ^ node isMarkedForInline ifFalse: [ 

        self error: 'Should not happen!!'

    ]

!

openDetected: node

    ^ compiler checkCache: (compiler idFor: node)

! !

!PPCCodeGenerator methodsFor:'support'!

addGuard: node

    |  guard firsts id |

    (arguments guards not or: [(guard := PPCGuard on: node) makesSense not]) ifTrue: [ ^ self].

    id := compiler idFor: node.

    firsts := node firstSetWithTokens.

    (firsts allSatisfy: [ :e | e isKindOf: PPCTrimmingTokenNode ]) ifTrue: [  

        "If we start with trimming, we should invoke the whitespace parser"

        self compileTokenWhitespace: firsts anyOne.

        compiler add: 'context atEnd ifTrue: [ ^ self error ].'.

        guard id: id, '_guard'.

        guard compileGuard: compiler.

        compiler addOnLine: 'ifFalse: [ ^ self error ].'

    ].

    (firsts allSatisfy: [ :e | e isTerminal ]) ifTrue: [  

        compiler add: 'context atEnd ifTrue: [ ^ self error ].'.

        guard id: id, '_guard'.

        guard compileGuard: compiler.

        compiler addOnLine: 'ifFalse: [ ^ self error ].'

    ].

!

compileTokenWhitespace: node

    compiler add: 'context atWs ifFalse: ['.

    compiler indent.

        compiler call: (self visit: node whitespace).

        compiler add: 'context setWs.'.

    compiler dedent.

    compiler add: '].'.

!

notCharSetPredicateBody: node

    | classificationId  classification |

    self error: 'deprecated.'.

    classification := node extendClassification: node predicate classification.

    classificationId := (compiler idFor: classification prefixed: #classification).

    compiler  addConstant: classification as: classificationId.

    compiler addOnLine: '(', classificationId, ' at: context peek asInteger)'.

    compiler indent.

    compiler add: ' ifTrue: [ self error: '' predicate not expected'' ]'.

    compiler add: ' ifFalse: [ nil ].'.

    compiler dedent.

!

notMessagePredicateBody: node

    self error: 'deprecated'.

    compiler addOnLine: '(context peek ', node message, ')'.

    compiler indent.

    compiler add: ' ifTrue: [ self error: '' predicate not expected'' ]'.

    compiler add: ' ifFalse: [ nil ].'.

    compiler dedent.

!

predicateBody: node

    | tmpId |

    self error:'deprecated'.

    tmpId := (compiler idFor: node predicate prefixed: #predicate).

    compiler addConstant: node predicate as: tmpId.

    compiler addOnLine: '(context atEnd not and: [ ', tmpId , ' value: context uncheckedPeek])'.

    compiler indent.

    compiler add: 'ifFalse: [ self error: ''predicate not found'' ]'.

    compiler add: 'ifTrue: [ context next ].'.

    compiler dedent.	

!

retvalVar

    ^ compiler currentReturnVariable 

!

startMethodForNode:node

    node isMarkedForInline ifTrue:[ 

		compiler startInline: (compiler idFor: node).

		compiler addComment: 'BEGIN inlined code of ' , node printString.

		compiler indent.

    ] ifFalse:[ 

		compiler startMethod: (compiler idFor: node).

		compiler addComment: 'GENERATED by ' , node printString.

		compiler allocateReturnVariable.

    ].

    "Created: / 23-04-2015 / 15:51:06 / Jan Vrany <jan.vrany@fit.cvut.cz>"

    "Modified: / 23-04-2015 / 19:13:25 / Jan Vrany <jan.vrany@fit.cvut.cz>"

    "Modified (comment): / 23-04-2015 / 21:31:24 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

stopMethodForNode:aPPCNode

    ^ aPPCNode isMarkedForInline ifTrue:[ 

		compiler dedent.

		compiler add: '"END inlined code of ' , aPPCNode printString , '"'.

		compiler stopInline.

    ] ifFalse:[ 

		compiler stopMethod

    ].

    "Created: / 23-04-2015 / 15:51:09 / Jan Vrany <jan.vrany@fit.cvut.cz>"

    "Modified: / 23-04-2015 / 18:35:41 / Jan Vrany <jan.vrany@fit.cvut.cz>"

! !

!PPCCodeGenerator methodsFor:'traversing - caching'!

cache: node value: retval

    "this is compiler thing, not mine"

!

cachedDetected: node

    ^ compiler checkCache: (compiler idFor: node)

!

isCached: node

    ^ (compiler checkCache: (compiler idFor: node)) isNil not

! !

!PPCCodeGenerator methodsFor:'visiting'!

visitActionNode: node

    | blockId |

    blockId := 'block_', (compiler idFor: node).

    compiler addConstant: node block as: blockId.

    compiler codeStoreValueOf: [ self visit: node child ] intoVariable: self retvalVar.

    compiler add: 'error ifFalse: ['.

    compiler codeReturn: blockId, ' value: ', self retvalVar.

    compiler add: '] ifTrue: ['.

    compiler codeReturn: 'failure'.

    compiler add: '].'.

    "Modified: / 05-05-2015 / 14:39:52 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

visitAndNode: node

    | mementoVar |

    mementoVar := compiler allocateTemporaryVariableNamed: 'memento'.

    compiler smartRemember: node child to: mementoVar.

    compiler codeStoreValueOf: [ self visit: node child  ] intoVariable: self retvalVar.

    compiler smartRestore: node child from: mementoVar.

    compiler codeReturn.

    "Modified: / 23-04-2015 / 15:59:07 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

visitAnyNode: node

    compiler codeReturn: 'context next ifNil: [ error := true. ].'.

    "Modified: / 23-04-2015 / 20:52:15 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

visitCharSetPredicateNode: node

    | classification classificationId |

    classification := node extendClassification: node predicate classification.

    classificationId := compiler idFor: classification prefixed: #classification.

    compiler addConstant: classification as: classificationId.

    compiler add: '(', classificationId, ' at: context peek asInteger)'.

    compiler indent.

    compiler add: 'ifFalse: [ self error: ''predicate not found'' ]'.

    compiler add: 'ifTrue: [ '.

    compiler codeReturn: 'context next'.

    compiler add: '].'.

    compiler dedent.

!

visitCharacterNode: node

    | chid |

    node character ppcPrintable ifTrue: [ 

        chid := node character storeString 

    ] ifFalse: [ 

        chid := compiler idFor: node character prefixed: #char.

        compiler addConstant: (Character value: node character asInteger) as: chid .

    ].

    compiler add: '(context peek == ', chid, ')'.

    compiler indent.

    compiler add: 'ifFalse: [ self error: ''', node character asInteger asString, ' expected'' at: context position ] '.

    compiler add: 'ifTrue: [ '.

    compiler codeReturn: 'context next'.

    compiler add: '].'.

    compiler dedent.

!

visitChild: child of: node

    |  |

    (self isOpen: child) ifTrue: [ 

        "already processing..."

        ^ nil

    ].

    "TODO JK: this is is wrong,.. to tired now to fix this :("

"	(self isCached: child) ifTrue: [ 

        node replace: child with: (self cachedValue: child).

        ^ nil

    ]. 

"

    ^ self visit: child.

!

visitChoiceNode: node

    | firsts guard whitespaceConsumed elementVar |

    "The code is not ready for inlining"

    self assert: node isMarkedForInline not.

    whitespaceConsumed := false.

    firsts := node firstSetWithTokens.

    elementVar := compiler allocateTemporaryVariableNamed: 'element'.

    "	

        If we want to compile in guard and the choice starts with trimming token, 

        we should invoke the whitespace parser

    "

    (arguments guards and: [ firsts allSatisfy: [ :e | e isTrimmingTokenNode ] ]) ifTrue: [  

        self compileTokenWhitespace: firsts anyOne.

        whitespaceConsumed := true.

    ].

    1 to: node children size do: [ :idx  | |child allowGuard |

        child := node children at: idx.

        allowGuard := whitespaceConsumed.

        (allowGuard and: [arguments guards and: [ (guard := PPCGuard on: child) makesSense ]]) ifTrue: [         

            guard id: (compiler idFor: guard prefixed: #guard).

            guard compileGuard: compiler.

            compiler add: ' ifTrue: [ '.

            compiler indent.

                compiler add: 'self clearError.'.

                compiler codeStoreValueOf:  [self visit: child] intoVariable: elementVar.

                compiler add: 'error ifFalse: [ ^ element ].'.

            compiler dedent.

            compiler add: ' ].'.

        ] ifFalse: [

            compiler add: 'self clearError.'.

            compiler codeStoreValueOf:  [self visit: child] intoVariable: elementVar.

            compiler add: 'error ifFalse: [ ^ element ].'.

        ]

    ].

    compiler add: '^ self error: ''no choice suitable'''.

    "Modified: / 05-05-2015 / 14:10:01 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

visitEndOfFileNode: node

    compiler codeReturn: 'context atEnd ifTrue: [ #EOF ] ifFalse: [ self error: ''EOF expected!!'' ].'.

!

visitEndOfInputNode: node

    compiler codeStoreValueOf: [ self visit: node child ] intoVariable: self retvalVar.

    compiler add: 'context atEnd ifTrue: ['.

    compiler codeReturn.	

    compiler add: '] ifFalse: ['.

    compiler codeError: 'End of input expected'.

    compiler add: ']'.

!

visitForwardNode: node

    compiler codeStoreValueOf: [ self visit: node child ] intoVariable: self retvalVar.

    compiler codeReturn.

!

visitLiteralNode: node

    | positionVar encodedLiteral |

    encodedLiteral := node encodeQuotes: node literal.

    positionVar := compiler allocateTemporaryVariableNamed: 'position'.

    compiler codeAssign: 'context position.' to: positionVar.

    compiler add: '((context next: ', node literal size asString, ') = #''', encodedLiteral, ''') ifTrue: ['.

    compiler codeReturn: '#''', encodedLiteral, ''' '.

    compiler add: '] ifFalse: ['.

    compiler add: '  context position: ', positionVar, '.'.

    compiler add: '  self error: ''', encodedLiteral,  ' expected'' at: position'.

    compiler add: '].'.

!

visitMessagePredicateNode: node

    compiler add: '(context peek ', node message, ') ifFalse: ['.

    compiler add: '  self error: ''predicate not found'''.

    compiler add: '] ifTrue: [ '.

    compiler codeReturn: ' context next'.

    compiler add: '].'.

    "Modified: / 23-04-2015 / 18:39:03 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

visitNilNode: node

    compiler codeReturn: 'nil.'.

!

visitNotCharSetPredicateNode: node

    | classificationId  classification |

    classification := node extendClassification: node predicate classification.

    classificationId := (compiler idFor: classification prefixed: #classification).

    compiler  addConstant: classification as: classificationId.

    compiler addOnLine: '(', classificationId, ' at: context peek asInteger)'.

    compiler indent.

    compiler add: ' ifTrue: [ self error: '' predicate not expected'' ]'.

    compiler add: ' ifFalse: ['.

    compiler codeReturn: 'nil'.

    compiler add: '].'.

    compiler dedent.

!

visitNotLiteralNode: node

    | encodedLiteral size |

    encodedLiteral := node encodeQuotes: node literal.

    size := node literal size asString.

    compiler add: '((context peek: ', size, ') =#''', encodedLiteral, ''')'.

    compiler indent.

    compiler add: 'ifTrue: [ self error: ''', encodedLiteral, ' not expected'' ]'.

    compiler add: 'ifFalse: [ '.

    compiler codeReturn: 'nil' .

    compiler add: '].'.

    compiler dedent.

!

visitNotMessagePredicateNode: node

    compiler addOnLine: '(context peek ', node message, ')'.

    compiler indent.

    compiler add: ' ifTrue: [ '.

    compiler codeError: 'predicate not expected'.

    compiler add: '] ifFalse: ['.

    compiler codeReturn: 'nil'.

    compiler add: ' ].'.

    compiler dedent. 

!

visitNotNode: node

    | mementoVar |

    mementoVar := compiler allocateTemporaryVariableNamed: 'memento'.

    compiler smartRemember: node child to: mementoVar.

    compiler codeStoreValueOf: [ self visit: node child  ] intoVariable: #whatever.

    compiler smartRestore: node child from: mementoVar.

    compiler add: '^ error ifFalse: [ self error ] ifTrue: [ self clearError. nil ]'.

    "Modified: / 05-05-2015 / 14:29:52 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

visitOptionalNode: node

    compiler codeStoreValueOf: [ self visit: node child ] intoVariable: self retvalVar.

    compiler add: 'error ifTrue: [ '.

    compiler add: '  self clearError. '.

    compiler codeAssign: 'nil.' to: self retvalVar.

    compiler add: '].'.

    compiler codeReturn.

!

visitPluggableNode: node

    | blockId |

    blockId := compiler idFor: node block prefixed: #block.

    compiler addConstant: node block as: blockId.

    compiler codeReturn: blockId, ' value: context.'.

!

visitPlusNode: node

    | elementVar |

    elementVar := compiler allocateTemporaryVariableNamed:  'element'.

    compiler codeAssign: 'OrderedCollection new.' to: self retvalVar.

    compiler codeStoreValueOf: [ self visit: node child ] intoVariable: elementVar.

    compiler add: 'error ifTrue: [ self error: ''at least one occurence expected'' ] ifFalse: ['.

    compiler indent.

        compiler add: self retvalVar , ' add: ',elementVar , '.'.

        compiler codeStoreValueOf: [ self visit: node child ] intoVariable: elementVar.

        compiler add: '[ error ] whileFalse: ['.

        compiler indent.

        compiler add: self retvalVar , ' add: ',elementVar , '.'.

        compiler codeStoreValueOf: [ self visit: node child ] intoVariable: elementVar.

        compiler dedent.

        compiler add: '].'.

        compiler add: 'self clearError.'.

        compiler codeReturn: self retvalVar , ' asArray.'.         

    compiler dedent.

    compiler add: '].'.

    "Modified (comment): / 23-04-2015 / 21:30:49 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

visitPredicateNode: node

    | pid |

    pid := (compiler idFor: node predicate prefixed: #predicate).

    compiler addConstant: node predicate as: pid.

    compiler add: '(context atEnd not and: [ ', pid , ' value: context uncheckedPeek])'.

    compiler indent.

    compiler add: 'ifFalse: [ self error: ''predicate not found'' ]'.

    compiler add: 'ifTrue: [ ', self retvalVar ,' := context next ].'.

    compiler dedent.   

    compiler codeReturn.

    "Modified: / 23-04-2015 / 21:48:11 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

visitRecognizingSequenceNode: node

    | mementoVar |

    mementoVar := compiler allocateTemporaryVariableNamed: 'memento'.			

    compiler smartRemember: node to: mementoVar.

"	self addGuard: compiler."

        compiler codeStoreValueOf: [ self visit: (node children at: 1) ] intoVariable: #whatever.

    compiler add: 'error ifTrue: [ ^ failure ].'.

    2 to: (node children size) do: [ :idx  | |child|

        child := node children at: idx.

        compiler codeStoreValueOf: [ self visit: child ] intoVariable: #whatever.

        compiler add: 'error ifTrue: [ '.

        compiler indent.

        compiler smartRestore: node from: mementoVar.

        compiler add: ' ^ failure .'.

        compiler dedent.

        compiler add: '].'.

    ].

!

visitSequenceNode: node

    | elementVar mementoVar |

    elementVar := compiler allocateTemporaryVariableNamed: 'element'.

    mementoVar := compiler allocateTemporaryVariableNamed: 'memento'.

    compiler smartRemember: node to: mementoVar.

    compiler codeAssign: 'Array new: ', node children size asString, '.' to: self retvalVar.

    self addGuard: node.

    1 to: (node children size) do: [ :idx  | |child|

        child := node children at: idx.

        compiler codeStoreValueOf: [ self visit: child ]  intoVariable: elementVar.