Hello everyone,
I have just started a project to convert our current way of processing the
file generated by our program into a more elegant way by using a parser
generator.
ANTLR so far as proven to be quite powerful but I think I have hit a bit of
a wall.
here is an extract of my grammar:
>>>>>>>>>>>>>>>>>>>>>>>
grammar MFL;
options{
language = C;
}
model:
'MODEL' ID 'ASSOC' cpa_vars id1=ID? id2=ID? ';'
;
cpa_vars returns [long var]:
'CPA' {$var = JVCPA;}
| 'PSAT' {$var = JVSVP;}
;
ID
:('a'..'z'|'A'..'Z'|'0'..'9'|'_')
('a'..'z'|'A'..'Z'|'0'..'9'|'_'|'-'|','|'+'|'.')*
;
>>>>>>>>>>>>>>>>>>>>>>>>
I think this should be enough to explain my problem.
the rule model should match things like, but there are situation where it
does not work as I expected:
example: this matches OK
MODEL mymodel ASSOC CPA BIP1 ;
but says that <missing ID> where cpa is.
MODEL cpa ASSOC CPA BIP1 ;
debugging the code I understand the lexer has assigned token type to the
literal present in the cpa_vars rule instead of the mode generic ID token
type.
My question is: how do I make sure I match ID instead of 'CPA' of another
rule for this case?
The configuration file I am trying to parse follows this structure that
depending in the place the tokens are, they are considered actual tokens or
else they are just general identifiers.
I sure will appreciate any help on this.
Best regards,
Nuno
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