[antlr-interest] Problem with existence of the same literal in two rules
ramyasivadas
ramyasivadas at yahoo.co.in
Wed Apr 30 04:49:45 PDT 2003
Hi,
Let me quote an example to help me explain the problem.
I have a rule as follows
STRING
:('a'..'z' | 'A'..'Z')+ (INT)
;
I also have a rule
WFCS
:'L'|'H'|'Z'|'X'
;
INT
:('0'..'9')+
;
The issue is, if I have a set of literals constituting a rule and if
one or more of the same literals form a part of another independent
rule, the parser generates an exception. How can I avoid this.
For example, the rule STRING is defined to be made up of a
combination of any alphabets followed by a numeral. Another rule WFCS
which has nothing to do with STRING can be made up of a combination
of L,H,Z and/or X.
When the parsing for WFCS block is done, the parser expects an INT
after the alphabet. I assume it is applying the STRING rule on the
WFCS block since it has encountered an alphabet. Can we override this
behaviour.
Thanks in advance.
Regards,
Ramya
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