extensions.py
c91b52d13f0fmaint-2.1

extensions.py
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			# -- coding: utf-8 --
			##
			## This file is part of Invenio.
			## Copyright (C) 2012, 2013, 2014 CERN.
			##
			## Invenio is free software; you can redistribute it and/or
			## modify it under the terms of the GNU General Public License as
			## published by the Free Software Foundation; either version 2 of the
			## License, or (at your option) any later version.
			##
			## Invenio is distributed in the hope that it will be useful, but
			## WITHOUT ANY WARRANTY; without even the implied warranty of
			## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
			## General Public License for more details.
			##
			## You should have received a copy of the GNU General Public License
			## along with Invenio; if not, write to the Free Software Foundation, Inc.,
			## 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.

			"""Custom `Jinja2` extensions."""

			from jinja2 import nodes
			from jinja2.ext import Extension
			from flask import g


			class LangExtension(Extension):

			"""Ease transition from legacy templates using ``<lang>...</lang>``."""

			tags = set(['lang'])

			def parse(self, parser):
			"""Parse the template."""
			lineno = parser.stream.next().lineno

			body = parser.parse_statements(['name:endlang'], drop_needle=True)

			return nodes.CallBlock(self.call_method('_lang'),
			[], [], body).set_lineno(lineno)

			@staticmethod
			def _lang(caller):
			"""Return current language string using `filter_languages`."""
			from invenio.modules.formatter.engine import filter_languages
			return filter_languages('<lang>' + caller() + '</lang>', g.ln)