I convert grammar http://www.antlr.org/grammar/HTML to ANTLR version 3
from 2.
I meet error:
error(211): HTML.g:209:3: [fatal] rule paragraph has non-LL(*) decision
due to recursive rule invocations reachable from alts 1,2. Resolve by
left-factoring or using syntactic predicates or using backtrack=true option.
Rule is:
paragraph
: OPARA
(
/* Rule body_content may also be just plain text because HTML is
so loose. When body puts body_content in a loop, ANTLR
doesn't know whether you want it to match all the text as part
of this paragraph (in the case where the </p> is missing) or
if the body rule should scarf it. This is analogous to the
dangling-else clause. I shut off the warning.
*/
/*options {
generateAmbigWarnings=false;
}*/
text
)*
(CPARA)?
;
options {backtrack=true;} nothing do, and backtracking is not good
because slown down parsing. Can be more text:
OPARA text text text .. (CPARA)
OPARA
: '<p' (WS ATTR)? '>'
;
CPARA
: '</p>' //it's optional
;
It is possible to left-factoring ? How use syntactic predicates ?
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