[antlr-interest] multiple lexer
hst_12345
hst_12345 at yahoo.com
Fri Nov 5 18:21:02 PST 2004
I am wokring on a project to parse expressions which is part of the
doc. So I wrote a seperate parser for the expression. And use
multiple lexer. The problem I have is that when switch back, one
token is eaten from the expression parser. Here is my doc syntax:
main parser:
EXP { '1.2+3.5' T; '3.6+6.8' H;}
So the main parser rule:
expression:
EXP LCURLY
( SINGLE_QUOTE {
_selector.select("expressionLex");
expressionParser.Parse();
_selector.select("mainLex");
}
SINGLE_QUOTE character
)+
;
The problem is when switch back, it complains to look for SINGLE_QUOTE
but get T which is next token. I do print out the expression which is
OK that does not include the single quote. So I do not know where
the single quote. why when it gets back to main parser and the single
quote went away.
Please help me out. I do not know what I can do.
Thanks
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