[antlr-interest] again nondeterminism problem

[mzukowski at yci.com]

MSG_DIR and MSG_TYPE share a common prefix of '[', so you need to combine
them into one rule, something like 

MSG_DIR
 : '[' 
       ("in" | "out")
       |("asyn" | "sync") {$setType(MSG_TYPE);}
    ']'
 ;

Monty

-----Original Message-----
From: vincedupuis [mailto:vincedupuis at yahoo.ca] 
Sent: Monday, December 15, 2003 8:23 AM
To: antlr-interest at yahoogroups.com
Subject: [antlr-interest] again nondeterminism problem

I understand the problem of nondeterminism.
But I don't know how to solve it.
I have the following rules in my parser:

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

MSG_DIR
 : '[' ("in" | "out") ']'
 ;

MSG_TYPE
 : '[' ("asyn" | "sync") ']'
 ;

of course I got the following warning:

warning:lexical nondeterminism between rules MSG_DIR and MSG_TYPE 
upon k==1:'['

Note: I want to be able to use the words (in, out, async, sync) as 
an IDENT also.




 

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