Python keywords as rule name

[38b394ce01]

It is not possible to use grammars that contain any Python keywords as rule name.

Consider the following ANTLR grammar:

grammar keyword;
start: False;
False: 'anything';`

This wil procude the keywordGenerator.py with the following function:

    @depthcontrol
    def False(self, parent=None):
        current = UnlexerRule(name='False', parent=parent)
        self._enter_rule(current)
        UnlexerRule(src='anything', parent=current)
        self._exit_rule(current)
        return current
    False.min_depth = 0

Because False is a reserved keyword in Python this is not valid Python code.
The bug occurs with every keyword.

[renatahodovan]

@38b394ce01 This is in sync with ANTLR, you cannot generate lexers/parsers from grammars containing keywords of the target language:

error(134): keyword.g4:3:0: symbol False conflicts with generated code in target language or runtime

The only aspect we could improve here is to give a similar error message in our grammar processing step.

[KvanTTT]

It's probably not actual since ANTLR >= 4.10 since it renames conflicting symbols in corresponding runtimes.

[renatahodovan]

@KvanTTT Thanks for pointing it out to me, I was not aware of this new feature. In this case, I'll add it to my TODO list.