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# -*- coding: utf-8 -*-
"""
Inline Gettext
~~~~~~~~~~~~~~
An example extension for Jinja2 that supports inline gettext calls.
Requires the i18n extension to be loaded.
:copyright: (c) 2009 by the Jinja Team.
:license: BSD.
"""
import re
from jinja2.ext import Extension
from jinja2.lexer import Token, count_newlines
from jinja2.exceptions import TemplateSyntaxError
_outside_re = re.compile(r'\\?(gettext|_)\(')
_inside_re = re.compile(r'\\?[()]')
class InlineGettext(Extension):
"""This extension implements support for inline gettext blocks::
<h1>_(Welcome)</h1>
<p>_(This is a paragraph)</p>
Requires the i18n extension to be loaded and configured.
"""
def filter_stream(self, stream):
paren_stack = 0
for token in stream:
if token.type is not 'data':
yield token
continue
pos = 0
lineno = token.lineno
while 1:
if not paren_stack:
match = _outside_re.search(token.value, pos)
else:
match = _inside_re.search(token.value, pos)
if match is None:
break
new_pos = match.start()
if new_pos > pos:
preval = token.value[pos:new_pos]
yield Token(lineno, 'data', preval)
lineno += count_newlines(preval)
gtok = match.group()
if gtok[0] == '\\':
yield Token(lineno, 'data', gtok[1:])
elif not paren_stack:
yield Token(lineno, 'block_begin', None)
yield Token(lineno, 'name', 'trans')
yield Token(lineno, 'block_end', None)
paren_stack = 1
else:
if gtok == '(' or paren_stack > 1:
yield Token(lineno, 'data', gtok)
paren_stack += gtok == ')' and -1 or 1
if not paren_stack:
yield Token(lineno, 'block_begin', None)
yield Token(lineno, 'name', 'endtrans')
yield Token(lineno, 'block_end', None)
pos = match.end()
if pos < len(token.value):
yield Token(lineno, 'data', token.value[pos:])
if paren_stack:
raise TemplateSyntaxError('unclosed gettext expression',
token.lineno, stream.name,
stream.filename)
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