Hi,
In my grammar, I can parse expression like this:
(A <= 1 or A >= 6) and (A not in (43,44))
Let's say, it is a kind of sql WHERE clause.
Here is a part of the grammar to understand the problem:
@rulecatch {
catch (RecognitionException re) {
if (this.errorMessage.isEmpty())
this.errorMessage = this.getErrorMessage(re,
this.getTokenNames()) + " [pos: " + (re.charPositionInLine -
errorPosOffset) + "]";
throw re;
}
}
...
arithexpr: (arithterm ) (
'+' arithterm |
'-' arithterm |
CONCAT arithterm)*;
arithterm: (arithatom | '-' arithatom)
('*' arithatom
| '/' arithatom)*;
arithatom: arithvar
| ifthenelse
| constantorparameter
| floorexpr
| floatexpr
| leftexpr
| rightexpr
| replaceexpr
| dayexpr
| monthexpr
| yearexpr
| yearnoexpr
| (arithexprparen)=> arithexprparen
;
arithexprparen: '(' arithexpr ')';
You can notice that I'm using syntactic predicate to support nested
expression with parenthesis.
The problem is the following:
If I have a mistake in my expression like this: (A <= 1 or A >= 6xx)
and (A not in (43,44))
Where 6xx is the mistake,
The error I have is: 'no viable alternative at input 'A' [pos:1]
This is because it doesn't reach the right parentheses while parsing
"(arithexprparen)=> arithexprparen", so the error is triggered for the
beginning of arithatom evaluation.
I would have liked it to tell me that the problem is 'x' and not 'A'.
Is there any way to deal with that ?
Thanks a lot for any help.
Philippe
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