> Please, post a self contained and minimal example.
Ok. I didn't test it by parsing actual code. I only looked at the conflict
%left ','
%right '='
%left '.'
%%
program:
newline_many global_loop newline_many
global_loop:
global_expr
| global_loop global_expr
global_expr:
VAR '(' ')' code_block
code_block: '{' newline_many body newline_one_or_more '}'
newline_many: | newline_many '\n'
newline_one_or_more: '\n' | newline_one_or_more '\n'
body:
body_expr
| body newline_one_or_more body_expr
| body_expr '=' body_expr ',' body_expr %prec '.'
| body_expr ',' body_expr '=' body_expr
| body_expr ',' body_expr '=' body_expr ',' body_expr
body_expr:
body_expr '=' body_expr
| body_expr '.' VAR
| VAR
%%
state 27
12 body: body_expr '=' body_expr . ',' body_expr
15 body_expr: body_expr . '=' body_expr
15 | body_expr '=' body_expr . [',', '\n']
16 | body_expr . '.' VAR
'=' shift, and go to state 29
'.' shift, and go to state 22
$default reduce using rule 15 (body_expr)
Conflict between rule 15 and token ',' resolved as reduce (',' < '=').
Conflict between rule 15 and token '=' resolved as shift (%right '=').
Conflict between rule 15 and token '.' resolved as shift ('=' < '.').
As you can see it says "Conflict between rule 15 and token ',' resolved as
reduce (',' < '=').". As you can see my rule is written as "| body_expr '='
body_expr ',' body_expr %prec '.'"
On Sun, Dec 22, 2013 at 2:35 PM, Akim Demaille <a...@lrde.epita.fr> wrote:
>
> Le 22 déc. 2013 à 18:40, Adam Smalin <acidzombi...@gmail.com> a écrit :
>
> > I forgot to CC this to the group a few days ago.
> >
> > >The token precedences apply to the tokens immediately before and after
> the parsing ‘.’ (as in the .output file) in the shift/reduce conflicting
> rules. The grammar must be written so that the tokens appear in such a
> position.
> >
> > | rval '=' rval %prec '.' ',' rval
>
> That's bad style, move your "%prec '.'" at the end of the rule.
> It means the same, but it's clearer. And therefore notice that
> now, this rule has the precedence of '.', not that of '='.
>
> > conflict file:
> >
> >
> > rval '=' rval . ',' rval
> > Conflict between rule 343 and token ',' resolved as reduce (',' < '=').
>
> So it's bizarre that in that conditions bison still refers to '='.
>
> > Shouldn't it have worked? I tried putting %prec at the end of the line
> and after the ',' as well and it failed. I tried multiple places at once
> and got an error saying only one %prec per line.
>
> Please, post a self contained and minimal example.
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