[antlr-interest] Lexer alt does not generate corresponding token?
parrt at cs.usfca.edu
Sun Oct 21 16:09:39 PDT 2012
yep, we did that on purpose. If you ever set a token type with a lexer command, is very risky to reference the surrounding lexer rule in a parser.
@Sam: can remember exactly how this a bit us?
On Oct 21, 2012, at 2:23 PM, Gerald Rosenberg wrote:
> When generating a lexer containing the rule
> : SL_COMMENT (SL_COMMENT)+ -> channel(HIDDEN), type(COMMENT_BLOCK)
> | SL_COMMENT -> channel(HIDDEN)
> no 'COMMENT_LINE' token is produced in the associated token vocab. Splitting the alts into separate rules produces the expected set of tokens. Bug or am I missing something?
> Using v4b2. Test lexer attached.
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