"
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.
"
ParseNode subclass:#StatementNode
instanceVariableNames:'expression nextStatement lineNr'
classVariableNames:''
poolDictionaries:''
category:'System-Compiler-Support'
!
!StatementNode 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 statements
This is a helper class for the compiler.
[author:]
Claus Gittinger
"
! !
!StatementNode class methodsFor:'instance creation'!
expression:e
^ (self basicNew) expression:e
! !
!StatementNode methodsFor:'accessing'!
expression
^ expression
!
expression:e
expression := e
!
last
"return the last statement in a list"
|last this|
"this could be done more elegant - but with lots of recursion"
last := self.
this := self.
[this notNil] whileTrue:[
last := this.
this := this nextStatement
].
^ last
!
lineNr
"return lineNr"
^ lineNr
"Created: 23.10.1996 / 14:51:54 / cg"
!
lineNr:something
"set lineNr"
lineNr := something.
"Created: 23.10.1996 / 14:51:58 / cg"
!
nextStatement
^ nextStatement
!
nextStatement:s
nextStatement := s
! !
!StatementNode methodsFor:'code generation'!
codeForSideEffectOn:aStream inBlock:b for:aCompiler
"generate code for this statement - value not needed"
expression codeForSideEffectOn:aStream inBlock:b for:aCompiler
!
codeOn:aStream inBlock:b for:aCompiler
"generate code for this statement"
expression codeOn:aStream inBlock:b for:aCompiler
! !
!StatementNode methodsFor:'evaluating'!
evaluate
|lastValue thisStatement|
"this could be done more elegant - but with lots of recursion"
thisStatement := self.
[thisStatement notNil] whileTrue:[
lastValue := thisStatement evaluateExpression.
thisStatement := thisStatement nextStatement
].
^ lastValue
!
evaluateExpression
^ expression evaluate
! !
!StatementNode methodsFor:'printing'!
printAllOn:aStream
self printAllOn:aStream indent:4
!
printAllOn:aStream indent:i
|thisStatement|
thisStatement := self.
[thisStatement notNil] whileTrue:[
aStream spaces:i.
thisStatement printOn:aStream indent:i.
thisStatement nextStatement notNil ifTrue:[
aStream nextPut:$..
aStream cr.
].
thisStatement := thisStatement nextStatement
]
!
printOn:aStream indent:i
expression printOn:aStream indent:i.
! !
!StatementNode methodsFor:'queries'!
collectBlocksInto:aCollection
|this|
this := self.
[this notNil] whileTrue:[
this expression collectBlocksInto:aCollection.
this := this nextStatement
].
"Created: 23.10.1996 / 15:44:13 / cg"
!
isConstant
nextStatement notNil ifTrue:[^ false].
^ expression isConstant
!
listEndsWithReturn
|thisStatement lastStatement|
thisStatement := self.
[thisStatement notNil] whileTrue:[
lastStatement := thisStatement.
thisStatement := thisStatement nextStatement
].
^ lastStatement isReturnNode
"Created: 19.8.1996 / 14:32:47 / cg"
! !
!StatementNode class methodsFor:'documentation'!
version
^ '$Header: /cvs/stx/stx/libcomp/StatementNode.st,v 1.17 1996-10-23 15:30:26 cg Exp $'
! !