86 lines
2.8 KiB
Python
86 lines
2.8 KiB
Python
"""
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This monkeypatches Django to support the __html__ protocol used in Jinja
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templates. Form, BoundField, ErrorList, and other form objects that
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render HTML through their __unicode__ method are extended with __html__
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so they can be rendered in Jinja templates without adding |safe.
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Call the patch() function to execute the patch. It must be called
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before django.forms is imported for the conditional_escape patch to work
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properly. The root URLconf is the recommended location for calling patch().
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Usage::
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import jingo.monkey
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jingo.monkey.patch()
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This patch was originally developed by Jeff Balogh and this version is taken
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from the nuggets project at
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https://github.com/mozilla/nuggets/blob/master/safe_django_forms.py
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"""
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import django.utils.encoding
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import django.utils.html
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import django.utils.safestring
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# This function gets directly imported within Django, so this change needs to
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# happen before too many Django imports happen.
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def conditional_escape(html):
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"""
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Similar to escape(), except that it doesn't operate on pre-escaped strings.
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"""
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if hasattr(html, '__html__'):
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return html.__html__()
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elif isinstance(html, django.utils.safestring.SafeData):
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return html
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return django.utils.html.escape(html)
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# Django uses SafeData to mark a string that has already been escaped or
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# otherwise deemed safe. This __html__ method lets Jinja know about that too.
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def __html__(self):
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"""
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Returns the html representation of a string.
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Allows interoperability with other template engines.
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"""
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return self
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# Django uses StrAndUnicode for classes like Form, BoundField, Widget which
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# have a __unicode__ method which returns escaped html. We replace
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# StrAndUnicode with SafeStrAndUnicode to get the __html__ method.
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class SafeStrAndUnicode(django.utils.encoding.StrAndUnicode):
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"""A class whose __str__ and __html__ returns __unicode__."""
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def __html__(self):
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return unicode(self)
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def patch():
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django.utils.html.conditional_escape = conditional_escape
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django.utils.safestring.SafeData.__html__ = __html__
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# forms imports have to come after we patch conditional_escape.
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from django.forms import forms, formsets, util, widgets
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# Replace StrAndUnicode with SafeStrAndUnicode in the inheritance
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# for all these classes.
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classes = (
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forms.BaseForm,
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forms.BoundField,
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formsets.BaseFormSet,
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util.ErrorDict,
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util.ErrorList,
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widgets.Media,
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widgets.RadioInput,
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widgets.RadioFieldRenderer,
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)
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for cls in classes:
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bases = list(cls.__bases__)
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if django.utils.encoding.StrAndUnicode in bases:
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idx = bases.index(django.utils.encoding.StrAndUnicode)
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bases[idx] = SafeStrAndUnicode
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cls.__bases__ = tuple(bases)
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