[antlr-interest] newbie question about nondeterminism between keywords and identifiers

[David Guy]

I have a typical lexer IDENT rule:

IDENT

options {testLiterals=true;}

   : ('_'|'a'..'z')('_'|'a'..'z'|'0'..'9')*

  ;

The language has some built in types. For example (from lexer):

 

TYPE_DATE   :"date";

// declares type

COLON        : ':';

 

In my parser, if I have a rule like:

 

decl:

IDENT COLON TYPE_DATE

;

 

I cannot parse "mydate : date" or "date_foo : date". The first example
gets IDENT than unexpected TYPE_DATE and the second case gets unexpected
TYPE_DATE. 

 

I know this is very basic stuff, but I have looked at sample Java
grammars and don't see anything different and of course in Java you can
say

int myint; int int_xxx;

 

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