from dparser import Parser

def d_add1(t):
    '''add : add '+' mul'''
    return t[0] + t[2]

def d_add2(t, nodes):
    '''add : mul'''
    return nodes[0].user.t

def d_mul1(t):
    '''mul : mul '*' exp'''
    return t[0]*t[2]

def d_mul2(t):
    '''mul : exp'''
    return t[0]

def d_exp1(t):
    '''exp : "[0-9]+"'''
    return int(t[0])

def d_exp2(t):
    '''exp : '(' add ')' '''
    return t[1]

if Parser().parse('''3*(3+4)''') != 21:
    print 'fail'