Re: Expression grammar with call

[John P. Hartmann]

%error-verbose
%right '='
%left '+'
%token IDENTIFIER INTEGER CALL
%%

expression: IDENTIFIER '=' expression
                | expression '+' expression
                | '( ' expression ')'
                | primary

primary: IDENTIFIER
                | INTEGER
                | CALL '(' expression ')'
%%

On 11/29/2013 09:54 AM, Philip Herron wrote:
> Hey all,
> 
> Its been a while since i've really seriously been working with bison but
> say i have the grammar:
> 
> %right '='
> %left '+'
> 
> expression: IDENTIFIER '=' expression
>                 | expression '+' expression
>                 | ...
>                 | '( ' expression ')'
>                 | primary
> 
> primary: IDENTIFIER
>            | INTEGER
> 
> What way should i go about adding support for something like:
> 
> x = call ( )
> 
> I get a shift/reduce conflict on this. Currently i have and it mostly works.
> 
> parameter: expression
> 
> parameter_list: parameter_list ',' parameter
>                     | parameter
> 
> call: IDENTIFIER '(' parameter_list ')'
> 
> primary: IDENTIFIER
>            | INTEGER
>            | call
> 
> Then if i want something like:
> 
> x = mytype { x = 1, y = 2; }
> 
> I was able to use %right '{' for this to work. But i am not sure how calls
> should be implemented.
> 
> Thanks
> 
> --Phil
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