[antlr-interest] parser synpred bug in antlr-03-16-2007.14
Loring Craymer
lgcraymer at yahoo.com
Fri Mar 16 16:06:23 PDT 2007
Allen--
As he mentioned earlier, Ter is fixing the error
reporting for this. However, you still need to
reorganize your code if you are going to use synpreds:
a:
('a' 'b') => 'a' 'b';
| 'a'
;
Syntactic predicates impose an ordering of
alternatives. In your formulation, the synpred is
attached to an "unreachable" alternative. Better
still would be to define
a:
'a' ('b')?
;
(left factoring).
--Loring
--- Allen Short <washort at divmod.com> wrote:
> grammar tiny;
>
> a:
> 'a'
> | ('a' 'b') => 'a' 'b';
>
>
> Upon compiling:
> 1. ERROR in tinyParser.java (at line 37)
> if ( (LA1_1==5) && (synpred1())) {
> ^^^^^^^^
> The method synpred1() is undefined for the type
> tinyParser
>
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