Hi all,
I'm using ANTLR 3.1.2.
Let's make it simple:
@int('444') is a function converting a string into integer.
If I don't have parentheses, then it is not a function, it is only a column
name. Ex.: @test, @integer, @in, ....
Here is a part of lexer rules:
fragment DIGIT : ('0'..'9');
fragment ALPHA : ('a'..'z'|'A'..'Z'|'_');
OB : '(';
INTTOKEN : ('@int' OB)=> '@int'; // so I check if there is an open
parenthesis to return INTTOKEN.
AT : '@';
NAME : ALPHA (ALPHA | DIGIT)*;
If my input is:
--> @int('444'), INTTOKEN is returned, which is OK.
--> @integer, mismatched input 'eger', expecting '('. --> I would
expect AT token followed by NAME token.
--> @int, mismatched input '', expecting '('. -->
same remark.
--> @i, mismatched character '', expecting 'n'. --> same remark.
Now, instead of AT and NAME rule, I replace by:
ATNAME : '@' NAME;
If my input is:
--> @int('444'), INTTOKEN is returned, which is OK.
--> @integer, ATNAME is returned, which is OK.
--> @int, mismatched input '', expecting '('. --> This is what I
want but I don't understand why I don't get ATNAME.
--> @i, ATNAME is returned, which is OK.
So, I have 2 questions:
1) Why isn't it working when separating the 2 lexer rules (AT and NAME) ?
2) Why isn't it returning ATNAME token when input is '@int' in the second case ?
Thanks a lot for any help
Philippe Frankson
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