How to use the js2py.internals.opcodes.OP_CODE function in Js2Py

]  # props are py string pairs (prop_name, kind): kind can be either i, g or s. (init, get, set)

    def __init__(self, props):
        self.num = len(props)
        self.props = props

    def eval(self, ctx):
        obj = ctx.space.NewObject()
        if self.num:
            obj._init(self.props, ctx.stack[-self.num:])
            del ctx.stack[-self.num:]

        ctx.stack.append(obj)


class LOAD_ARRAY(OP_CODE):
    _params = ['num']

    def __init__(self, num):
        self.num = num

    def eval(self, ctx):
        arr = ctx.space.NewArray(self.num)
        if self.num:
            arr._init(ctx.stack[-self.num:])
            del ctx.stack[-self.num:]
        ctx.stack.append(arr)


class LOAD_THIS(OP_CODE):
    def eval(self, ctx):
        ctx.stack.append(ctx.THIS_BINDING)

if typ in PRIMITIVES:
            prop = to_string(name)
            if typ == NULL_TYPE:
                raise MakeError('TypeError',
                                "Cannot set property '%s' of null" % prop)
            elif typ == UNDEFINED_TYPE:
                raise MakeError('TypeError',
                                "Cannot set property '%s' of undefined" % prop)
            # just ignore...
        else:
            left.put_member(name, value)

        ctx.stack.append(value)


class STORE_MEMBER_DOT(OP_CODE):
    _params = ['prop']

    def __init__(self, prop):
        self.prop = prop

    def eval(self, ctx):
        value = ctx.stack.pop()
        left = ctx.stack.pop()

        typ = type(left)
        if typ in PRIMITIVES:
            if typ == NULL_TYPE:
                raise MakeError('TypeError',
                                "Cannot set property '%s' of null" % self.prop)
            elif typ == UNDEFINED_TYPE:
                raise MakeError(

class POSTFIX(OP_CODE):
    _params = ['cb', 'ca', 'identifier']

    def __init__(self, post, incr, identifier):
        self.identifier = identifier
        self.cb = 1 if incr else -1
        self.ca = -self.cb if post else 0

    def eval(self, ctx):
        target = to_number(ctx.get(self.identifier)) + self.cb
        ctx.put(self.identifier, target)
        ctx.stack.append(target + self.ca)


class POSTFIX_MEMBER(OP_CODE):
    _params = ['cb', 'ca']

    def __init__(self, post, incr):
        self.cb = 1 if incr else -1
        self.ca = -self.cb if post else 0

    def eval(self, ctx):
        name = ctx.stack.pop()
        left = ctx.stack.pop()

        target = to_number(get_member(left, name, ctx.space)) + self.cb
        if type(left) not in PRIMITIVES:
            left.put_member(name, target)

        ctx.stack.append(target + self.ca)

class CALL_METHOD_DOT_NO_ARGS(OP_CODE):
    _params = ['prop']

    def __init__(self, prop):
        self.prop = prop

    def eval(self, ctx):
        base = ctx.stack.pop()

        func = get_member_dot(base, self.prop, ctx.space)

        return bytecode_call(ctx, func, base, ())


class NOP(OP_CODE):
    def eval(self, ctx):
        pass


class RETURN(OP_CODE):
    def eval(
            self, ctx
    ):  # remember to load the return value on stack before using RETURN op.
        return (None, None)


class NEW(OP_CODE):
    def eval(self, ctx):
        args = ctx.stack.pop()
        constructor = ctx.stack.pop()
        if type(constructor) in PRIMITIVES or not hasattr(

def __init__(self, n):
        self.n = n

    def eval(self, ctx):
        tup = tuple(ctx.stack[-self.n:])
        del ctx.stack[-self.n:]
        ctx.stack.append(tup)


class LOAD_UNDEFINED(OP_CODE):
    def eval(self, ctx):
        ctx.stack.append(undefined)


class LOAD_NULL(OP_CODE):
    def eval(self, ctx):
        ctx.stack.append(null)


class LOAD_BOOLEAN(OP_CODE):
    _params = ['val']

    def __init__(self, val):
        assert val in (0, 1)
        self.val = bool(val)

    def eval(self, ctx):
        ctx.stack.append(self.val)


class LOAD_STRING(OP_CODE):

class CALL_METHOD_DOT(OP_CODE):
    _params = ['prop']

    def __init__(self, prop):
        self.prop = prop

    def eval(self, ctx):
        args = ctx.stack.pop()
        base = ctx.stack.pop()

        func = get_member_dot(base, self.prop, ctx.space)

        return bytecode_call(ctx, func, base, args)


class CALL_NO_ARGS(OP_CODE):
    def eval(self, ctx):
        func = ctx.stack.pop()

        return bytecode_call(ctx, func, ctx.space.GlobalObj, ())


class CALL_METHOD_NO_ARGS(OP_CODE):
    def eval(self, ctx):
        prop = ctx.stack.pop()
        base = ctx.stack.pop()

        func = get_member(base, prop, ctx.space)

        return bytecode_call(ctx, func, base, ())

# --------------- CALLS --------------


def bytecode_call(ctx, func, this, args):
    if type(func) is not PyJsFunction:
        raise MakeError('TypeError', "%s is not a function" % Type(func))
    if func.is_native:  # call to built-in function or method
        ctx.stack.append(func.call(this, args))
        return None

    # therefore not native. we have to return (new_context, function_label) to instruct interpreter to call
    return func._generate_my_context(this, args), func.code


class CALL(OP_CODE):
    def eval(self, ctx):
        args = ctx.stack.pop()
        func = ctx.stack.pop()

        return bytecode_call(ctx, func, ctx.space.GlobalObj, args)


class CALL_METHOD(OP_CODE):
    def eval(self, ctx):
        args = ctx.stack.pop()
        prop = ctx.stack.pop()
        base = ctx.stack.pop()

        func = get_member(base, prop, ctx.space)

        return bytecode_call(ctx, func, base, args)

return bytecode_call(ctx, func, ctx.space.GlobalObj, args)


class CALL_METHOD(OP_CODE):
    def eval(self, ctx):
        args = ctx.stack.pop()
        prop = ctx.stack.pop()
        base = ctx.stack.pop()

        func = get_member(base, prop, ctx.space)

        return bytecode_call(ctx, func, base, args)


class CALL_METHOD_DOT(OP_CODE):
    _params = ['prop']

    def __init__(self, prop):
        self.prop = prop

    def eval(self, ctx):
        args = ctx.stack.pop()
        base = ctx.stack.pop()

        func = get_member_dot(base, self.prop, ctx.space)

        return bytecode_call(ctx, func, base, args)


class CALL_NO_ARGS(OP_CODE):
    def eval(self, ctx):

def __init__(self, identifier):
        self.identifier = identifier

    # 11.1.2
    def eval(self, ctx):
        ctx.stack.append(ctx.get(self.identifier, throw=True))


class LOAD_MEMBER(OP_CODE):
    def eval(self, ctx):
        prop = ctx.stack.pop()
        obj = ctx.stack.pop()
        ctx.stack.append(get_member(obj, prop, ctx.space))


class LOAD_MEMBER_DOT(OP_CODE):
    _params = ['prop']

    def __init__(self, prop):
        self.prop = prop

    def eval(self, ctx):
        obj = ctx.stack.pop()
        ctx.stack.append(get_member_dot(obj, self.prop, ctx.space))


# --------------- STORING --------------


class STORE(OP_CODE):
    _params = ['identifier']

func = ctx.stack.pop()

        return bytecode_call(ctx, func, ctx.space.GlobalObj, ())


class CALL_METHOD_NO_ARGS(OP_CODE):
    def eval(self, ctx):
        prop = ctx.stack.pop()
        base = ctx.stack.pop()

        func = get_member(base, prop, ctx.space)

        return bytecode_call(ctx, func, base, ())


class CALL_METHOD_DOT_NO_ARGS(OP_CODE):
    _params = ['prop']

    def __init__(self, prop):
        self.prop = prop

    def eval(self, ctx):
        base = ctx.stack.pop()

        func = get_member_dot(base, self.prop, ctx.space)

        return bytecode_call(ctx, func, base, ())


class NOP(OP_CODE):
    def eval(self, ctx):
        pass