[antlr-interest] Problem Writing Lexer Rule
Jason
jasonriz at yahoo.com
Fri Mar 5 12:31:16 PST 2004
Hello,
The following is a snippet of a grammar I've written:
protected NOT_CB: ~']';
protected ESC_CB: "]]";
protected TEMP_D: NOT_CB | ESC_CB;
protected DELIM_ID: '[' (TEMP_D)+ ']';
REG_OR_DELIM_ID: DELIM_ID;
It fails on the following input:
[aaa].[bbb]
complaining thusly:
expecting ']', found '.'
I've looked at the generated code and the problem
occurs after the last 'a' has been processed and LA(1)
= ']' and LA(2) = '.'. The lookahead checks in
mDELIM_ID are constructed such that "]." passes and
mTEMP_D( ) gets called and then of course fails. This
seems like a job for syntactic predicates but I can't
seem to get it straightened out. Any guidence would
be greatly appreciated. Thanks in advance.
-jason
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