[antlr-interest] Follow up to hoisted predicates and local variables

[Mike Lischke]

Hi,

I'm bitten by this problem as well: http://antlr.markmail.org/message/eliyhfji5hsrbyoz?q=hoisted+predicates+and+local+variables

but with lexer rules and wonder what would be a good approach to solve this case? I couldn't get global scopes to work because I cannot use them in a lexer rule. Lexer member vars seem to be a good solution, but they are evaluated in the dfa15_sst helper before they are actually set.

Here's the relevant code:

fragment BLOCK_COMMENT options{ greedy = false; }:
	VERSION_COMMENT
	| MULTILINE_COMMENT
;

fragment VERSION_COMMENT:
	LOGICAL_NOT_OPERATOR (v = INTEGER WS { matched_version = check_version($v); })? VERSION_COMMENT_TAIL
;

fragment VERSION_COMMENT_TAIL:
	{ !matched_version }? => ( options { greedy = false; }: . )* '*' '/' { $type = MULTILINE_COMMENT; $channel = 98; }
	| { $type = VERSION_COMMENT; $channel = 98; in_version_comment = true; }


(the initial /* is consumed by a higher level rule).

Mike
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