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jinja2utils.py
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jinja2utils.py
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# -*- coding: utf-8 -*-
## This file is part of Invenio.
## Copyright (C) 2012 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.
from operator import itemgetter
from jinja2 import nodes
from jinja2.ext import Extension
from flask import _request_ctx_stack
try:
from MarkupSafe import Markup as jinja2_Markup, escape as jinja2_escape
except ImportError:
from jinja2._markupsafe import Markup as jinja2_Markup, \
escape as jinja2_escape
ENV_PREFIX = '_collected_'
def prepare_tag_bundle(cls, tag):
"""
Construct function that returns collected data specified
in jinja2 template like `{% <tag> <value> %}` in correct
order.
Here is an example that shows the final order when template
inheritance is used::
example.html
------------
{%\ extends 'page.html' %}
{%\ css 'template2.css' %}
{%\ css 'template3.css' %}
page.html
---------
{%\ css 'template1.css' %}
{{ get_css_bundle() }}
Output:
-------
[template1.css, template2.css, template3.css]
"""
def get_bundle(key=None, iterate=False):
def _get_data_by_key(data_, key_):
return map(itemgetter(1), filter(lambda (k, v): k == key_, data_))
data = getattr(cls.environment, ENV_PREFIX+tag)
if iterate:
bundles = sorted(set(map(itemgetter(0), data)))
def _generate_bundles():
for bundle in bundles:
cls._reset(tag, bundle)
yield cls.environment.new_bundle(tag,
_get_data_by_key(data,
bundle),
bundle)
return _generate_bundles()
else:
if key is not None:
data = _get_data_by_key(data, key)
else:
bundles = sorted(set(map(itemgetter(0), data)))
data = [f for bundle in bundles
for f in _get_data_by_key(data, bundle)]
cls._reset(tag, key)
return cls.environment.new_bundle(tag, data, key)
return get_bundle
class CollectionExtension(Extension):
"""
CollectionExtension adds new tags `css` and `js` and functions
``get_css_bundle`` and ``get_js_bundle`` for jinja2 templates.
The ``new_bundle`` method is used to create bundle from
list of file names collected using `css` and `js` tags.
Example: simple case
{% css 'css/invenio.css' %}
{% js 'js/jquery.js' %}
{% js 'js/invenio.js' %}
...
{% assets get_css_bundle() %}
<link rel="stylesheet" type="text/css" href="{{ ASSET_URL }}"></link>
{% endassets %}
{% assets get_js_bundle() %}
In template, use {{ ASSETS_URL }} for printing file URL.
{% endassets %}
Example: named bundles
record.html:
{% extend 'page.html' %}
{% css 'css/may-vary.css' %}
# default bundle name can be changed in application factory
# app.jinja_env.extend(default_bundle_name='90-default')
{% css 'css/record.css', '10-record' %}
{% css 'css/form.css', '10-record' %}
page.html:
{% css 'css/bootstrap.css', '00-base' %}
{% css 'css/invenio.css', '00-base' %}
...
{% for bundle in get_css_bundle(iterate=True) %}
{% assets bundle %}
<link rel="stylesheet" type="text/css" href="{{ ASSET_URL }}"></link>
{% endassets %}
{% endfor %}
Output:
<link rel="stylesheet" type="text/css" href="/css/00-base.css"></link>
<link rel="stylesheet" type="text/css" href="/css/10-record.css"></link>
<link rel="stylesheet" type="text/css" href="/css/90-default.css"></link>
Note:
If you decide not to use assets bundle but directly print
stylesheet and script html tags, you MUST define:
```
_app.jinja_env.extend(
use_bundle = False,
collection_templates = {
'css': '<link rel="stylesheet" type="text/css" href="/%s"></link>',
'js': '<script type="text/javascript" src="/%s"></script>'
})
```
Both callable and string with '%s' are allowed in
``collection_templates``.
"""
tags = set(['css', 'js'])
def __init__(self, environment):
super(CollectionExtension, self).__init__(environment)
ext = dict(('get_%s_bundle' % tag, prepare_tag_bundle(self, tag))
for tag in self.tags)
environment.extend(
default_bundle_name='10-default',
use_bundle=True,
collection_templates=dict((tag, lambda x: x) for tag in self.tags),
new_bundle=lambda tag, collection, name: collection,
**ext)
for tag in self.tags:
self._reset(tag)
def _reset(self, tag, key=None):
"""
Empty list of used scripts.
"""
if key is None:
setattr(self.environment, ENV_PREFIX+tag, [])
else:
data = filter(lambda (k, v): k != key,
getattr(self.environment, ENV_PREFIX+tag))
setattr(self.environment, ENV_PREFIX+tag, data)
def _update(self, tag, value, key, caller=None):
"""
Update list of used scripts.
"""
try:
values = getattr(self.environment, ENV_PREFIX+tag)
values.append((key, value))
except:
values = [(key, value)]
setattr(self.environment, ENV_PREFIX+tag, values)
return ''
def parse(self, parser):
"""
Parse Jinja statement tag defined in `self.tags` (default: css, js).
This accually tries to build corresponding html script tag
or collect script file name in jinja2 environment variable.
If you use bundles it is important to call ``get_css_bundle``
or ``get_js_bundle`` in template after all occurrences of
script tags (e.g. {% css ... %}, {% js ...%}).
"""
tag = parser.stream.current.value
lineno = next(parser.stream).lineno
default_bundle_name = u"%s" % (self.environment.default_bundle_name)
default_bundle_name.encode('utf-8')
bundle_name = nodes.Const(default_bundle_name)
#parse filename
if parser.stream.current.type != 'block_end':
value = parser.parse_expression()
# get first optional argument: bundle_name
if parser.stream.skip_if('comma'):
bundle_name = parser.parse_expression()
if isinstance(bundle_name, nodes.Name):
bundle_name = nodes.Name(bundle_name.name, 'load')
else:
value = parser.parse_tuple()
args = [nodes.Const(tag), value, bundle_name]
# Return html tag with link to corresponding script file.
if self.environment.use_bundle is False:
value = value.value
if callable(self.environment.collection_templates[tag]):
node = self.environment.collection_templates[tag](value)
else:
node = self.environment.collection_templates[tag] % value
return nodes.Output([nodes.MarkSafeIfAutoescape(nodes.Const(node))])
# Call :meth:`_update` to collect names of used scripts.
return nodes.CallBlock(self.call_method('_update', args=args,
lineno=lineno),
[], [], '')
def render_template_to_string(input, _from_string=False, **context):
"""Renders a template from the template folder with the given
context and return the string.
:param input: the string template, or name of the template to be
rendered, or an iterable with template names
the first one existing will be rendered
:param context: the variables that should be available in the
context of the template.
:note: code based on
[https://github.com/mitsuhiko/flask/blob/master/flask/templating.py]
"""
ctx = _request_ctx_stack.top
ctx.app.update_template_context(context)
if _from_string:
template = ctx.app.jinja_env.from_string(input)
else:
template = ctx.app.jinja_env.get_or_select_template(input)
return template.render(context)
from flask import g
from invenio.bibformat_engine import filter_languages
class LangExtension(Extension):
tags = set(['lang'])
def parse(self, parser):
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)
def _lang(self, caller):
return filter_languages('<lang>' + caller() + '</lang>', g.ln)
def hack_jinja2_utf8decoding():
"""
Jinja2 requires all strings to be unicode objects. Invenio however operates
with UTF8 encoded str objects. Jinja2 will automatically convert non-unicode
objects into unicode objects, but via the ascii codec. This function
replaces the escape function and Markup class in Jinja2/MarkupSafe, to
use the utf8 codec when converting 8-bit str objects into unicode objects.
Ideally Jinja2/MarkupSafe should allow specifying which default encoding to
use when decoding strings. Other alternatives is to decode any str object
into unicode prior to passing the values to Jinja2 methods. This will
however require large changes over the entire Invenio codebase, with the
risk of introducing many errors. This runtime hack is unfortunately
currently the least intrusive way to fix the str to unicode decoding.
"""
# Jinja2 will try to load escape method and Markup class from a variety of
# different modules. First it will try from MarkupSafe package, then from
# jinja2._markupsafe._speedup, then jinja2._markupsafe._native. Ideally, we
# should only replace the function and class at the implementing module.
# However, due to Python's package/module loading behaviour, the function
# and class will be imported into other jinja2 modules as soon as we try to
# import the module implementing the function and class. Hence, we need to
# replace the function and class in the modules where it has already been
# imported.
import jinja2
import jinja2.runtime
import jinja2.utils
import jinja2.nodes
import jinja2.filters
import jinja2.ext
import jinja2.environment
import jinja2.compiler
# Escape function replacement in Jinja2 library
jinja2._markupsafe.escape = utf8escape
jinja2.runtime.escape = utf8escape
jinja2.utils.escape = utf8escape
jinja2.filters.escape = utf8escape
jinja2.compiler.escape = utf8escape
jinja2.escape = utf8escape
# Markup class replacement in Jinja2 library
jinja2._markupsafe.Markup = Markup
jinja2.runtime.Markup = Markup
jinja2.utils.Markup = Markup
jinja2.filters.Markup = Markup
jinja2.compiler.Markup = Markup
jinja2.Markup = Markup
jinja2.nodes.Markup = Markup
jinja2.ext.Markup = Markup
jinja2.environment.Markup = Markup
# Escape/Markup replacement in MarkupSafe library.
try:
import MarkupSafe
MarkupSafe.escape = utf8escape
MarkupSafe.Markup = Markup
except ImportError:
pass
def utf8escape(s):
"""
UTF8-8-bit-string-friendly replacement function for MarkupSafe/Jinja2
escape function.
WARNING: Do not use this method. Use jinja2.escape() instead.
"""
if isinstance(s, str):
return jinja2_escape(s.decode('utf8'))
return jinja2_escape(s)
# Ensure function name is identical to replaced function.
utf8escape.__name__ = jinja2_escape.__name__
class Markup(jinja2_Markup):
"""
Markup replacement class
Forces the use of utf8 codec for decoding 8-bit strings, in case no
encoding is specified.
WARNING: Do not use this class. Use jinja2.Markup instead.
"""
def __new__(cls, base=u'', encoding=None, errors='strict'):
if encoding is None and isinstance(base, str):
encoding = 'utf8'
return jinja2_Markup.__new__(cls, base=base, encoding=encoding,
errors=errors)
def extend_application_template_filters(app):
"""
Extends application template filters with custom filters and fixes.
List of applied filters:
------------------------
* filesizeformat
* path_join
* quoted_txt2html
* invenio_format_date
* invenio_pretty_date
* invenio_url_args
"""
import os
from datetime import datetime
from invenio.textutils import nice_size
from invenio.dateutils import convert_datetext_to_dategui, \
convert_datestruct_to_dategui, pretty_date
from invenio.webmessage_mailutils import email_quoted_txt2html
@app.template_filter('filesizeformat')
def _filesizeformat_filter(value):
"""
Jinja2 filesizeformat filters is broken in Jinja2 up to v2.7, so
let's implement our own.
"""
return nice_size(value)
@app.template_filter('path_join')
def _os_path_join(d):
"""Shortcut for `os.path.join`."""
return os.path.join(*d)
@app.template_filter('quoted_txt2html')
def _quoted_txt2html(*args, **kwargs):
return email_quoted_txt2html(*args, **kwargs)
@app.template_filter('invenio_format_date')
def _format_date(date):
"""
This is a special Jinja2 filter that will call
convert_datetext_to_dategui to print a human friendly date.
"""
if isinstance(date, datetime):
return convert_datestruct_to_dategui(date.timetuple(),
g.ln).decode('utf-8')
return convert_datetext_to_dategui(date, g.ln).decode('utf-8')
@app.template_filter('invenio_pretty_date')
def _pretty_date(date):
"""
This is a special Jinja2 filter that will call
pretty_date to print a human friendly timestamp.
"""
if isinstance(date, datetime):
return pretty_date(date, ln=g.ln)
return date
@app.template_filter('invenio_url_args')
def _url_args(d, append=u'?', filter=[]):
from jinja2.utils import escape
rv = append + u'&'.join(
u'%s=%s' % (escape(key), escape(value))
for key, value in d.iteritems(True)
if value is not None and key not in filter
# and not isinstance(value, Undefined)
)
return rv

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