I've got a problem where I need some communication back from Bison to
Flex (in this case, I need Flex to return two different tokens for the
same input, depending on context).
The procedure is something like:
1 - parser determines context and sets global flag for lexer
2 - lexer checks flag, reads a name, and returns a token depending on
the flag
In general, this doesn't work because of Bison's lookahead - as often as
not, the lexer has already returned a token before Bison has set the flag.
Is there a general solution to this problem? 'yyclearin' is no good; it
just over-writes 'yychar'. YYBACKUP doesn't help, either, because you
can't use it if there's already something in yychar. Ideally, I need to
check if there's anything in yychar, and then push it back somehow.
Any ideas?
Thanks -
Evan
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