[antlr-interest] token not recognized

[kumarr]

Hi all,

I have defined a token called GEN that can take on various string values.
The grammar is below.

The token is question is GEN. I'm trying to parse a very simple string
conforming to this grammar: "Unavailable(LEP)". When it sees "LEP" it
complains that it found 'LEP' when it was expecting GEN. The error message
is:

line 1:13 mismatched input 'LEP' expecting GEN

I don't understand this. I have defined "LEP" as one of the values that GEN
can take!!

The same problem happens for "Unavailable(REP)". The inputs
"Unavailable(VFSG_L1)", "Unavailable(VFSG_L2)" etc are parsed without
errors.

does anyone know what could be gong on?
Thanks.
Rajesh

**********************grammar		 Expression2; 

prog	
	:	exp

	;
	
exp	
	: atomic_expr 
	| 
	;
	

atomic_expr 
	:	 ID 
	|	ID '>' NUM 
	|	ID '<' NUM 
	|	'Unavailable' '(' GEN ')'
	;

ID	:	 ('a'..'z'|'A'..'Z')('a'..'z'|'A'..'Z'|'0'..'9')*
	;

NUM	:	('0'..'9')+
	;
	
GEN	:     'VFSG_L1'
	| 	'LEP'
	| 	'REP'
	|	'VFSG_L2'
	|	'VFSG_R1'
	|	'VFSG_R2'
	|	'ASG_L'
	|	'ASG_R' 
	;
	
BUS	:	'L1_V235_bus'
	|	'L2_V235_bus'
	|	'R1_V235_bus'
	|	'R2_V235_bus'
	|	'Backup_bus'
	;
	
WS	:	(' '|'\t'|'\n')+ {skip();};

*****************************************
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