def p_binary_e(self, p):
'''
or_e : or_e LOR and_e
and_e : and_e LAND compare_e
compare_e : compare_e EQUAL rel_e
| compare_e NOTEQ rel_e
rel_e : rel_e LT add_e
| rel_e GT add_e
| rel_e LE add_e
| rel_e GE add_e
add_e : add_e PLUS mul_e
| add_e MINUS mul_e
mul_e : mul_e TIMES sa_e
| mul_e DIV sa_e
| mul_e MOD sa_e
'''
p[0] = expression.binary_operator(p[2], p[1], p[3], p.lexpos(2))
def p_dec(self, p):
'assign_e : IDENT DEC'
q = expression.reference(p[1], p.lexpos(1))
p[0] = expression.assignment(q, expression.binary_operator('-', q, expression.const(1, type.int_t, p.lexpos(2)), p.lexpos(2)), p.lexpos(2))