[antlr-interest] beginer question

[pepone pepone]

Hello all

I'm begining work with antlr, and i a bit confused. I'm not sure when
to put a rule in lexer or in the parser. There is a general rule to
decide when a rule must be in lexer or in parser?

and i confused with protected rules, what is the diference in a lexer
between this tow rules

protected
LETTER
	:
	'a'..'z'|'A'..'Z'
	;

LETTER
	:
	'a'..'z'|'A'..'Z'
	;

if i don't use protected i get warning when use (LETTER)+ in other
rule, "warning:lexical nondeterminism upon"


Thanks in advance
--
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