"

 COPYRIGHT (c) 1993 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.

"

Object subclass:#UndefinedVariable

	 instanceVariableNames:'name'

	 classVariableNames:''

	 poolDictionaries:''

	 category:'System-Compiler-Support'

!

!UndefinedVariable class methodsFor:'documentation'!

copyright

"

 COPYRIGHT (c) 1993 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 undefined variables

    This class exists solely for the error message when accessing undefined

    variables - instead of returning nil,  the compiler returns an instance

    of this class,  which will not understand ANY message.

    The error message will then be 'UndefinedVariable ...' 

    instead of 'UndefineObject ...', which is somewhat more informative.

"

! !

!UndefinedVariable class methodsFor:'instance creation'!

name:aString

    ^ (self basicNew) setName:aString

! !

!UndefinedVariable methodsFor:'catching messages'!

class

    ^ self

!

methods

    self methodError

!

methodsFor:arg

    self methodError

!

subclass:t instanceVariableNames:f classVariableNames:d poolDictionaries:s

    self subclassingError

!

subclass:t instanceVariableNames:f classVariableNames:d poolDictionaries:s category:cat

    self subclassingError

!

variableByteSubclass:t instanceVariableNames:f 

			  classVariableNames:d poolDictionaries:s category:cat

    self subclassingError

!

variableSubclass:t instanceVariableNames:f 

			  classVariableNames:d poolDictionaries:s category:cat

    self subclassingError

!

variableWordSubclass:t instanceVariableNames:f 

			  classVariableNames:d poolDictionaries:s category:cat

    self subclassingError

! !

!UndefinedVariable methodsFor:'error reporting'!

methodError

    self error:('trying to define methods for undefined class: ', name)

!

subclassingError

    self error:('trying to create subclass of undefined class: ', name)

! !

!UndefinedVariable methodsFor:'file skipping'!

fileInFrom:aStream notifying:someOne passChunk:passChunk

    "this is sent, if you continue after a warning about

     methods for undefined class.

     It simply skips chunks and sends a warning to the Transcript."

    |aString done|

    done := false.

    [done] whileFalse:[

	done := aStream atEnd.

	done ifFalse:[

	    aString := aStream nextChunk.

	    done := aString isNil or:[aString isEmpty].

	    done ifFalse:[

		Transcript showCr:'*** skipping method for undefined class: ' , name

	    ]

	]

    ].

! !

!UndefinedVariable methodsFor:'printing & storing'!

printString

    "return a string for printing myself"

    ^ 'UndefinedVariable(' , name , ')'

! !

!UndefinedVariable methodsFor:'private accessing'!

setName:aString

    name := aString

! !