[antlr-interest] syntax predicate strange behavior
Ilia Kantor
ilia at obnovlenie.ru
Mon Apr 30 15:03:37 PDT 2007
Hello, I have a rule
command_user_body:
(LCURL) => LCURL command_arguments? RCURL -> ^(USER_COMMAND command_arguments?) |
-> USER_COMMAND
;
On input LCURL WS WORD WS MINUS GT...
this gives me exception from DFA.noViableAlt at first WORD token.
How can that happen ?
I guess, it should match LCURL and go first alternative and match it happily no ?
By the way, this works fine:
command_user_body
options {backtrack=true;}:
LCURL command_arguments? RCURL -> ^(USER_COMMAND command_arguments?) |
-> USER_COMMAND
;
Best wishes
Ilia
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