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I'm using Jinja2's nl2br filter, which looks like:
import re
from jinja2 import environmentfilter, Markup, escape
_paragraph_re = re.compile(r'(?:\r\n|\r|\n){2,}')
@evalcontextfilter
def nl2br(eval_ctx, value):
result = u'\n\n'.join(u'<p>%s</p>' % p.replace('\n', '<br>\n')
for p in _paragraph_re.split(escape(value)))
if eval_ctx.autoescape:
result = Markup(result)
return result
The problem is if "value" has anything but ascii characters (for example: "/mɒnˈtænə/" causes it to fail). I get this error:
Traceback (most recent call last):
File "/usr/local/lib/python2.6/dist-packages/Flask-0.6.1-py2.6.egg/flask/app.py", line 889, in __call__
return self.wsgi_app(environ, start_response)
File "/usr/local/lib/python2.6/dist-packages/Flask-0.6.1-py2.6.egg/flask/app.py", line 879, in wsgi_app
response = self.make_response(self.handle_exception(e))
File "/usr/local/lib/python2.6/dist-packages/Flask-0.6.1-py2.6.egg/flask/app.py", line 876, in wsgi_app
rv = self.dispatch_request()
File "/usr/local/lib/python2.6/dist-packages/Flask-0.6.1-py2.6.egg/flask/app.py", line 695, in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File "/home/mcrittenden/Dropbox/Code/dropdo/dropdo.py", line 105, in view
return render_template(template, src = url, data = content)
File "/usr/local/lib/python2.6/dist-packages/Flask-0.6.1-py2.6.egg/flask/templating.py", line 85, in render_template
context, ctx.app)
File "/usr/local/lib/python2.6/dist-packages/Flask-0.6.1-py2.6.egg/flask/templating.py", line 69, in _render
rv = template.render(context)
File "/usr/local/lib/python2.6/dist-packages/Jinja2-2.5.5-py2.6.egg/jinja2/environment.py", line 891, in render
return self.environment.handle_exception(exc_info, True)
File "/home/mcrittenden/Dropbox/Code/dropdo/templates/text.html", line 1, in top-level template code
{% extends "layout.html" %}
File "/home/mcrittenden/Dropbox/Code/dropdo/templates/layout.html", line 25, in top-level template code
{% block content %}{% endblock %}
File "/home/mcrittenden/Dropbox/Code/dropdo/templates/text.html", line 8, in block "content"
{{ data|nl2br }}
File "/home/mcrittenden/Dropbox/Code/dropdo/dropdo.py", line 26, in nl2br
for p in _paragraph_re.split(escape(value)))
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc9 in position 12: ordinal not in range(128)
What's the best to prevent the error but not remove the problem characters altogether?
661
Jinja2 provides hooks for adding custom filters. These are just Python functions, so if you wrote Python function before you will be able to write your own filter as well! Aforementioned automation frameworks also support custom filters and the process of writing them is similar to vanilla Jinja2.
select (*args, **kwargs) - Filters the sequence by retaining only the elements passing the Jinja2 test. This filter is the opposite of reject. You can use either of those depending on what feels more natural in given scenario.
Here we're only interested in values of name attribute: reject (*args, **kwargs) - Filters sequence of items by applying a Jinja2 test and rejecting objects succeeding the test. That is item will be removed from the final list if result of the test is true.
Use unicode literals everywhere.
"Unicode in Python, Completely Demystified"
142
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