What special Characters are allowed in Smalltalk Instance Variable Names and Methods?

Question

I remember seeing a method somewhere that actually allowed only letters 'Uppercase', 'lowercase', numbers and the underscore in the name, but I can't find it again for the life of me.

Are any other characters allowed?

Answer 1

If you want to check which Characters are allowed in selector names you could use the RefactoringBrowser scanner and evaluate:

RBScanner isSelector: 'invalid@Selector'.
RBScanner isSelector: 'ValidSelector123_test'.
RBScanner isSelector: '111selector123_test'.

the same applies to instance variable names

RBCondition checkInstanceVariableName: 'validInstVar' in: UndefinedObject.
" true, valid instance variable name "
RBCondition checkInstanceVariableName: 'super' in: UndefinedObject.
" false, super is a reserved word in Smalltalk "
RBCondition checkInstanceVariableName: '' in: UndefinedObject.
" false, empty instance variables are not allowed "
RBCondition checkInstanceVariableName: 'Invalid' in: UndefinedObject.
" false, instance variable must start with lowercase character "

or class variables

RBCondition checkClassVarName: 'invalidClassVar' in: UndefinedObject.
" false, because class variables must start with uppercase "
RBCondition checkClassVarName: 'super' in: UndefinedObject.
" false, the same "
RBCondition checkClassVarName: '' in: UndefinedObject.
" false, empty Class variables are not allowed "
RBCondition checkClassVarName: 'Valid' in: UndefinedObject.
" true, a valid class variable "