basic.py 文件源码

def test_url_processors(self):
        app = flask.Flask(__name__)

        @app.url_defaults
        def add_language_code(endpoint, values):
            if flask.g.lang_code is not None and \
               app.url_map.is_endpoint_expecting(endpoint, 'lang_code'):
                values.setdefault('lang_code', flask.g.lang_code)

        @app.url_value_preprocessor
        def pull_lang_code(endpoint, values):
            flask.g.lang_code = values.pop('lang_code', None)

        @app.route('/<lang_code>/')
        def index():
            return flask.url_for('about')

        @app.route('/<lang_code>/about')
        def about():
            return flask.url_for('something_else')

        @app.route('/foo')
        def something_else():
            return flask.url_for('about', lang_code='en')

        c = app.test_client()

        self.assert_equal(c.get('/de/').data, b'/de/about')
        self.assert_equal(c.get('/de/about').data, b'/foo')
        self.assert_equal(c.get('/foo').data, b'/en/about')