astTools.py 文件源码

def doBinaryOp(op, l, r):
    """Perform the given AST binary operation on the values"""
    top = type(op)
    if top == ast.Add:
        return l + r
    elif top == ast.Sub:
        return l - r
    elif top == ast.Mult:
        return l * r
    elif top == ast.Div:
        # Don't bother if this will be a really long float- it won't work properly!
        # Also, in Python 3 this is floating division, so perform it accordingly.
        val = 1.0 * l / r
        if (val * 1e10 % 1.0) != 0:
            raise Exception("Repeating Float")
        return val
    elif top == ast.Mod:
        return l % r
    elif top == ast.Pow:
        return l ** r
    elif top == ast.LShift:
        return l << r
    elif top == ast.RShift:
        return l >> r
    elif top == ast.BitOr:
        return l | r
    elif top == ast.BitXor:
        return l ^ r
    elif top == ast.BitAnd:
        return l & r
    elif top == ast.FloorDiv:
        return l // r