[antlr-interest] Question about handling key words in grammars

[Stefan Misch]

Hi,

I'm just starting ANTLR and there are so many questions. AMZ delivered the
book today but...

Why do some grammmars define language keywords in different ways:

sometimes "inline" in a rule, e.g.
create_package
	:	'CREATE' ( OR keyREPLACE )?

sometimes as explicit lexical tokens, e.g.
CREATE: 'CREATE'

sometimes as "keyword" like this:
keyREPLACE: {(this.input).LT(1).Text.ToUpper() == "REPLACE"}? ID;

One reason maybe that a keyX definition is case insensitive because of the
use of "ToUpper()".

Another reason why I'm asking is, that AntlrWorks 1.4.1 seems to have a
problem with these keyX, as I cannot use the interpreter. And the Debugger
seems to have another problem as it does just nothing (I've seen a recent
post that this seems to be a bug).

Thanks,
Stefan

Antlr 3.3, AntlrWorks 1.4.1, WinXP