tests/test_ext.py

# -*- coding: utf-8 -*-
"""
    unit test for some extensions
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

    :copyright: 2008 by Armin Ronacher.
    :license: BSD, see LICENSE for more details.
"""
import re
from jinja2 import Environment, nodes
from jinja2.ext import Extension
from jinja2.lexer import Token, count_newlines


importable_object = 23


_gettext_re = re.compile(r'_\((.*?)\)')


class TestExtension(Extension):
    tags = set(['test'])
    ext_attr = 42

    def parse(self, parser):
        return nodes.Output([self.call_method('_dump', [
            nodes.EnvironmentAttribute('sandboxed'),
            self.attr('ext_attr'),
            nodes.ImportedName(__name__ + '.importable_object'),
            nodes.ContextReference()
        ])]).set_lineno(parser.stream.next().lineno)

    def _dump(self, sandboxed, ext_attr, imported_object, context):
        return '%s|%s|%s|%s' % (
            sandboxed,
            ext_attr,
            imported_object,
            context.blocks
        )


class PreprocessorExtension(Extension):

    def preprocess(self, source, name, filename=None):
        return source.replace('[[TEST]]', '({{ foo }})')


class StreamFilterExtension(Extension):

    def filter_stream(self, stream):
        for token in stream:
            if token.type is 'data':
                for t in self.interpolate(token):
                    yield t
            else:
                yield token

    def interpolate(self, token):
        pos = 0
        end = len(token.value)
        lineno = token.lineno
        while 1:
            match = _gettext_re.search(token.value, pos)
            if match is None:
                break
            value = token.value[pos:match.start()]
            if value:
                yield Token(lineno, 'data', value)
            lineno += count_newlines(token.value)
            yield Token(lineno, 'variable_begin', None)
            yield Token(lineno, 'name', 'gettext')
            yield Token(lineno, 'lparen', None)
            yield Token(lineno, 'string', match.group(1))
            yield Token(lineno, 'rparen', None)
            yield Token(lineno, 'variable_end', None)
            pos = match.end()
        if pos < end:
            yield Token(lineno, 'data', token.value[pos:])


def test_loop_controls():
    env = Environment(extensions=['jinja2.ext.loopcontrols'])

    tmpl = env.from_string('''
        {%- for item in [1, 2, 3, 4] %}
            {%- if item % 2 == 0 %}{% continue %}{% endif -%}
            {{ item }}
        {%- endfor %}''')
    assert tmpl.render() == '13'

    tmpl = env.from_string('''
        {%- for item in [1, 2, 3, 4] %}
            {%- if item > 2 %}{% break %}{% endif -%}
            {{ item }}
        {%- endfor %}''')
    assert tmpl.render() == '12'


def test_do():
    env = Environment(extensions=['jinja2.ext.do'])
    tmpl = env.from_string('''
        {%- set items = [] %}
        {%- for char in "foo" %}
            {%- do items.append(loop.index0 ~ char) %}
        {%- endfor %}{{ items|join(', ') }}''')
    assert tmpl.render() == '0f, 1o, 2o'


def test_extension_nodes():
    env = Environment(extensions=[TestExtension])
    tmpl = env.from_string('{% test %}')
    assert tmpl.render() == 'False|42|23|{}'


def test_identifier():
    assert TestExtension.identifier == __name__ + '.TestExtension'


def test_rebinding():
    original = Environment(extensions=[TestExtension])
    overlay = original.overlay()
    for env in original, overlay:
        for ext in env.extensions.itervalues():
            assert ext.environment is env


def test_preprocessor_extension():
    env = Environment(extensions=[PreprocessorExtension])
    tmpl = env.from_string('{[[TEST]]}')
    assert tmpl.render(foo=42) == '{(42)}'


def test_streamfilter_extension():
    env = Environment(extensions=[StreamFilterExtension])
    env.globals['gettext'] = lambda x: x.title()
    tmpl = env.from_string('Foo _(bar) Baz')
    assert tmpl.render() == 'Foo Bar Baz'