Smalltalk实例变量名称和方法中允许使用哪些特殊字符？

Question

我记得在某个地方看到的方法实际上只允许字母"大写","小写",数字和名称中的下划线,但我无法再找到它.

是否允许任何其他角色？

Answer 1

如果要检查选择器名称中允许哪些字符,可以使用RefactoringBrowser扫描程序并评估:

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

这同样适用于实例变量名称

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 "

或类变量

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 "