Hi,
I'm working on a parser for a file format that can contain text and delimiters.
One of the delimiters is a ':', and you can escape the delimiter by following
it with a '?' such as ':?'.
I'd like to have the lexer consider the ':?' as part of the TEXT token, and ':'
match the SEPARATOR token. So I tried this:
file : contents+ EOF ;
contents : TEXT
| CSEP
;
CSEP: ':';
TEXT: ('a'..'z'|'A'..'Z'|'0'..'9'|' '|'-'|','|'.'|'/'|COLON)+ ;
fragment COLON: ':?' ;
This didn't work, as the input "hello:" caused an error. I guess it was
expecting to continue a TEXT token (next char would be '?'), and met with an
EOF instead.
I imagine there's a way to do this, perhaps with predicates, but I'm not
experienced enough to see the obvious solution. Can anyone help?
Thanks,
Rob
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