| # Copyright 2016 Google Inc. All Rights Reserved. |
| # |
| # Licensed under the Apache License, Version 2.0 (the "License"); |
| # you may not use this file except in compliance with the License. |
| # You may obtain a copy of the License at |
| # |
| # http://www.apache.org/licenses/LICENSE-2.0 |
| # |
| # Unless required by applicable law or agreed to in writing, software |
| # distributed under the License is distributed on an "AS IS" BASIS, |
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| # See the License for the specific language governing permissions and |
| # limitations under the License. |
| """Defines ExpressionGenerator class.""" |
| import abc |
| |
| |
| class ExpressionGenerator: |
| """Abstract base class for building snippets of code for a JavaScript engine. |
| |
| Implementations of the private abstract methods should return a C++ expression |
| that will evaluate the described condition. The public methods return |
| callables that take a single argument, which is the value to be tested. |
| """ |
| __metaclass__ = abc.ABCMeta |
| |
| @abc.abstractmethod |
| def is_undefined(self, arg): |
| pass |
| |
| @abc.abstractmethod |
| def is_undefined_or_null(self, arg): |
| pass |
| |
| @abc.abstractmethod |
| def is_number(self, arg): |
| pass |
| |
| @abc.abstractmethod |
| def inherits_interface(self, interface_name, arg): |
| pass |
