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extensions.py
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Sun, Nov 10, 11:42

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)

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