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|
%{
#include <stdio.h>
#include "expr.h"
extern int yylex(void);
extern int yyerror(const char *s);
static void breakpoint(void) { }
%}
%token INTEGER
%token STRING
%token '(' ')'
%left MATCH MULTIPLICATION
%left '+' '-'
%left COMPARISON AND OR
%start expr
%%
expr : STRING {
}
| INTEGER {
}
| '(' expr ')' {
printf("a parenthesized expression\n");
}
| expr MATCH expr {
printf("match two\n");
}
| expr MULTIPLICATION expr {
printf("multiplicationish\n");
}
| expr '+' expr {
$$.u.i = $1.u.i + $3.u.i;
printf("%d\n", $$.u.i);
}
| expr '-' expr {
$$.u.i = $1.u.i - $3.u.i;
printf("%d\n", $$.u.i);
}
| expr COMPARISON expr {
printf("compare\n");
}
| expr AND expr {
printf("and\n");
}
| expr OR expr {
printf("or\n");
}
;
|
