[antlr-interest] Premature lexer matching

[Paul J. Lucas]

(Hit return too soon for previous post -- sorry.)

Given the following in the lexer:

	FOO
		: ("foo" "::") => "foo" { $setType( FOO_1 ); }
		| ("foo" '(') => "foo" { $setType( FOO_2 ); }
		| "foo" { $setType( BAR ); }
		;

	BAR
		: ('a'..'z')+
		;

meaning:

	1. If "foo" is followed by "::" then it's really a FOO_1.
	2. If "foo" is followed by '(' then it's really a FOO_2.
	3. Otherwise it's really a BAR.

Given this input:

	foobar()

The lexer incorrectly matches just "foo" even though it's immediately followed by non-whitespace text.  It should match "foobar" as a BAR.
Why does this not do what I want and how can I fix it?

- Paul


 

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