"

 COPYRIGHT (c) 1989 by Claus Gittinger

	      All Rights Reserved

 This software is furnished under a license and may be used

 only in accordance with the terms of that license and with the

 inclusion of the above copyright notice.   This software may not

 be provided or otherwise made available to, or used by, any

 other person.  No title to or ownership of the software is

 hereby transferred.

"

"{ Package: 'stx:libcomp' }"

"{ NameSpace: Smalltalk }"

MessageNode subclass:#CascadeNode

	instanceVariableNames:''

	classVariableNames:''

	poolDictionaries:''

	category:'System-Compiler-Support'

!

!CascadeNode class methodsFor:'documentation'!

copyright

"

 COPYRIGHT (c) 1989 by Claus Gittinger

	      All Rights Reserved

 This software is furnished under a license and may be used

 only in accordance with the terms of that license and with the

 inclusion of the above copyright notice.   This software may not

 be provided or otherwise made available to, or used by, any

 other person.  No title to or ownership of the software is

 hereby transferred.

"

!

documentation

"

    node for parse-trees, representing cascade message sends

    This is a helper class for the compiler.

    [author:]

        Claus Gittinger

"

! !

!CascadeNode methodsFor:'*VMMaker-C translation'!

asTranslatorNodeIn: aTMethod

        "make a CCodeGenerator equivalent of me"

        ^Squeak::TStmtListNode new

                setArguments: #()

                statements:

                        (Array streamContents:

                                [:s| | receiverNode |

                                receiverNode := self realReceiver "receiver" asTranslatorNodeIn: aTMethod.   

                                receiverNode isLeaf ifFalse:

                                        [| varNode |

                                         varNode := aTMethod newCascadeTempFor: receiverNode.

                                         s nextPut: (Squeak::TAssignmentNode new

                                                                setVariable: varNode

                                                                expression: receiverNode).

                                        receiverNode := varNode].

                                self messages do:

                                        [ :msg | s nextPut: ((msg asTranslatorNodeIn: aTMethod) receiver: receiverNode)]]);

                comment: ((comments ? #()) firstIfEmpty:nil)

    "Modified: / 14-09-2011 / 10:41:14 / cg"

!

realReceiver

    "return the real receiver

     (sigh; ST/X encodes things differently)"

    |r|

    r := receiver.

    [r isCascade] whileTrue:[

        r := r receiver.

    ].

    ^ r receiver

    "Created: / 12-09-2011 / 10:01:48 / cg"

! !

!CascadeNode methodsFor:'code generation'!

codeForCascadeOn:aStream inBlock:b for:aCompiler

    "the old code could lead to a recursion error with

     long cascades;

     the new code does not."

    "/ old

    "/ receiver codeForCascadeOn:aStream inBlock:b for:aCompiler.

    "/ aStream nextPut:#dup.

    "/ self codeSendOn:aStream inBlock:b valueNeeded:false for:aCompiler

    "/ new

    |leftMostExpression sequence|

    leftMostExpression := receiver.

    sequence := OrderedCollection new.

    [ leftMostExpression isCascade ] whileTrue:[

        sequence addFirst:leftMostExpression.

        leftMostExpression := leftMostExpression receiver.

    ].

    leftMostExpression codeForCascadeOn:aStream inBlock:b for:aCompiler.

    sequence do:[:eachCascade |

        aStream nextPut:#dup.

        eachCascade codeSendOn:aStream inBlock:b valueNeeded:false for:aCompiler.

    ].

    aStream nextPut:#dup.

    self codeSendOn:aStream inBlock:b valueNeeded:false for:aCompiler.

    "Modified: / 08-08-2017 / 18:04:48 / cg"

!

codeOn:aStream inBlock:b valueNeeded:valueNeeded for:aCompiler

    receiver codeForCascadeOn:aStream inBlock:b for:aCompiler.

    self codeSendOn:aStream inBlock:b valueNeeded:valueNeeded for:aCompiler

! !

!CascadeNode methodsFor:'enumerating'!

messages

    "helper for parse tree walking"

    "/ sigh; ST/X encodes things differently ...

    |r nd msgs msg|

    msgs := OrderedCollection new.

    r := receiver.

    [r isCascade] whileTrue:[

        r := r receiver.

    ].

    r := r receiver.

    nd := self.

    [nd isCascade] whileTrue:[

        msg := MessageNode new.

        msg receiver:r selector:nd selector args:nd args lineno:nd lineNumber.

        msgs addFirst:msg.

        nd := nd receiver.

    ].

    msg := MessageNode new.

    msg receiver:r selector:nd selector args:nd args lineno:nd lineNumber.

    msgs addFirst:msg.

    ^ msgs

    "Created: / 12-09-2011 / 10:04:31 / cg"

!

nodeDo:anEnumerator

    "helper for parse tree walking"

    "/ sigh; ST/X encodes things differently ...

    |r nd msgs msg|

    msgs := OrderedCollection new.

    r := receiver.

    [r isCascade] whileTrue:[

        r := r receiver.

    ].

    r := r receiver.

    nd := self.

    [nd isCascade] whileTrue:[

        msg := MessageNode new.

        msg receiver:r selector:nd selector args:nd args lineno:nd lineNumber.

        msgs addFirst:msg.

        nd := nd receiver.

    ].

    msg := MessageNode new.

    msg receiver:r selector:nd selector args:nd args lineno:nd lineNumber.

    msgs addFirst:msg.

    ^ anEnumerator doCascade:self receiver:r messages:msgs

    "Created: 19.6.1997 / 16:39:17 / cg"

    "Modified: 19.6.1997 / 17:32:47 / cg"

! !

!CascadeNode methodsFor:'evaluation'!

evaluateForCascadeIn:anEnvironment

    selector := selector asSymbol.

    receiver isSuper ifTrue:[

        ^ super evaluateForCascadeIn:anEnvironment

    ].

    argArray isNil ifTrue:[

        t perform:selector.

        ^ t

    ].

    argValueArray := argArray collect:[:arg | arg evaluateIn:anEnvironment]. 

    t perform:selector withArguments:argValueArray.

    ^ t

!

evaluateIn:anEnvironment

    |t argValueArray|

    selector := selector asSymbol.

    receiver isSuper ifTrue:[

        ^ super evaluateIn:anEnvironment

    ].

    t := receiver evaluateForCascadeIn:anEnvironment.

    argArray isNil ifTrue:[

        ^ t perform:selector.

        "/ t perform:selector. ^ t

    ].

    argValueArray := argArray collect:[:arg | arg evaluateIn:anEnvironment].

    ^ t perform:selector withArguments:argValueArray

! !

!CascadeNode methodsFor:'printing & storing'!

printOn:aStream indent:i 

    |selectorParts|

    selectorParts := selector asCollectionOfSubstringsSeparatedBy:$:.

    selectorParts last isEmpty ifTrue:[selectorParts := selectorParts copyButLast:1].

    receiver printOn:aStream indent:i.

    aStream nextPutAll:'; '.

    argArray size == 0 ifTrue:[

        selector printOn:aStream

    ] ifFalse:[

        argArray 

            with:selectorParts

            do:[:arg :selPart | 

                aStream 

                    space;

                    nextPutAll:selPart;

                    nextPutAll:': '.

                arg printOn:aStream indent:i + 4 parenthized:(arg precedence <= self precedence).

            ]

    ]

    "Modified: / 12-09-2011 / 09:46:45 / cg"

! !

!CascadeNode methodsFor:'testing'!

isCascade

    ^ true

    "Created: / 16.7.1998 / 20:03:51 / cg"

! !

!CascadeNode methodsFor:'visiting'!

acceptVisitor:aVisitor 

    "Double dispatch back to the visitor, passing my type encoded in

     the selector (visitor pattern)"

    "stub code automatically generated - please change if required"

    ^ aVisitor visitCascadeNode:self

! !

!CascadeNode class methodsFor:'documentation'!

version

    ^ '$Header$'

!

version_CVS

    ^ '$Header$'

! !