ParserTest/parser.ym at master · epatel/ParserTest · GitHub

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%{

#import "MessageBlocks.h"

int yylex(void);
void yyerror(char *s);

%}

%union {
    float     value;
    NSString *identifier;
}

%token <value> INTEGER
%token <value> FLOAT

%token <identifier> IDENTIFIER

%type <value> expr
%type <value> number

%destructor { [$$ release]; } IDENTIFIER

%left '+' '-'
%left '*' '/'

%%

calc : expr { if (ParseTestSuccessBlock) ParseTestSuccessBlock($1); }

expr : number { $$ = $1; }
| expr '*' expr { $$ = $1 * $3; }
| expr '/' expr { $$ = $1 / $3; }
| expr '+' expr { $$ = $1 + $3; }
| expr '-' expr { $$ = $1 - $3; }

number : INTEGER { $$ = $1; }
| FLOAT { $$ = $1; }
| IDENTIFIER { if ([$1 isEqualToString:@"pi"]) $$ = M_PI; else $$ = 0.0; [$1 release]; }

%%