[antlr-interest] pls look at my parser, who can help me to kill this nest problem!
ib_icf
ib_icf at yahoo.com.cn
Tue Sep 14 03:17:45 PDT 2004
I found this toy very interesting, but meet some problems, here is
the definition of my parser:
class ExprParser extends Parser;
stat
: expr
| ifStat
;
ifStat
: IF ifPart END IF
;
ifPart
: expr THEN stat
( ELSE stat )?
;
expr
: andExpr
(AND andExpr
|OR andExpr
)*
;
andExpr
: numExpr
(EQUAL numExpr
|GREAT numExpr
|LESS numExpr
|GRTEQ numExpr
|LESEQ numExpr
)?
| LPAREN expr RPAREN
;
numExpr
: mexpr
( PLUS mexpr
| MINUS mexpr
)*
;
mexpr
: atom
( STAR atom
| DIV atom
)*
;
atom
: i:NUM
| LPAREN numExpr RPAREN
;
=====================================================
end of defintion
=====================================================
Because I use bracket for atom, I meet a problem when I want to add
another bracket for the andExpr, well, what can I do?
when i compile it, the error message is:
ANTLR Parser Generator Version 2.7.3 1989-2004 jGuru.com
tz.g:19: warning:nondeterminism between alts 1 and 2 of block upon
tz.g:19: k==1:LPAREN
Appreciate it!
Tiger
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