Bundled jinja filters.
- :copyright: 2008 by Armin Ronacher, Christoph Hack.
+ :copyright: (c) 2009 by the Jinja Team.
:license: BSD, see LICENSE for more details.
"""
import re
import math
from random import choice
-try:
- from operator import itemgetter
-except ImportError:
- itemgetter = lambda a: lambda b: b[a]
-from urllib import urlencode, quote
-from itertools import imap
+from operator import itemgetter
+from itertools import imap, groupby
from jinja2.utils import Markup, escape, pformat, urlize, soft_unicode
from jinja2.runtime import Undefined
+from jinja2.exceptions import FilterArgumentError, SecurityError
-_striptags_re = re.compile(r'(<!--.*?-->|<[^>]*>)')
+_word_re = re.compile(r'\w+(?u)')
def contextfilter(f):
- """Decorator for marking context dependent filters. The current context
- argument will be passed as first argument.
+ """Decorator for marking context dependent filters. The current
+ :class:`Context` will be passed as first argument.
"""
if getattr(f, 'environmentfilter', False):
raise TypeError('filter already marked as environment filter')
def environmentfilter(f):
- """Decorator for marking evironment dependent filters. The environment
- used for the template is passed to the filter as first argument.
+ """Decorator for marking evironment dependent filters. The current
+ :class:`Environment` is passed to the filter as first argument.
"""
if getattr(f, 'contextfilter', False):
raise TypeError('filter already marked as context filter')
return f
-def do_replace(s, old, new, count=None):
+def do_forceescape(value):
+ """Enforce HTML escaping. This will probably double escape variables."""
+ if hasattr(value, '__html__'):
+ value = value.__html__()
+ return escape(unicode(value))
+
+
+@environmentfilter
+def do_replace(environment, s, old, new, count=None):
"""Return a copy of the value with all occurrences of a substring
replaced with a new one. The first argument is the substring
that should be replaced, the second is the replacement string.
"""
if count is None:
count = -1
+ if not environment.autoescape:
+ return unicode(s).replace(unicode(old), unicode(new), count)
if hasattr(old, '__html__') or hasattr(new, '__html__') and \
not hasattr(s, '__html__'):
s = escape(s)
else:
s = soft_unicode(s)
- return s.replace(old, new, count)
+ return s.replace(soft_unicode(old), soft_unicode(new), count)
def do_upper(s):
return soft_unicode(s).lower()
-def do_xmlattr(d, autospace=False):
+@environmentfilter
+def do_xmlattr(_environment, d, autospace=True):
"""Create an SGML/XML attribute string based on the items in a dict.
All values that are neither `none` nor `undefined` are automatically
escaped:
.. sourcecode:: html+jinja
- <ul{{ {'class': 'my_list', 'missing': None,
+ <ul{{ {'class': 'my_list', 'missing': none,
'id': 'list-%d'|format(variable)}|xmlattr }}>
...
</ul>
</ul>
As you can see it automatically prepends a space in front of the item
- if the filter returned something. You can disable this by passing
- `false` as only argument to the filter.
+ if the filter returned something unless the second parameter is false.
"""
- if not hasattr(d, 'iteritems'):
- raise TypeError('a dict is required')
- result = []
- for key, value in d.iteritems():
- if value is not None and not isinstance(value, Undefined):
- result.append(u'%s="%s"' % (
- escape(env.to_unicode(key)),
- escape(env.to_unicode(value), True)
- ))
rv = u' '.join(
u'%s="%s"' % (escape(key), escape(value))
for key, value in d.iteritems()
if value is not None and not isinstance(value, Undefined)
)
- if autospace:
- rv = ' ' + rv
- return Markup(rv)
+ if autospace and rv:
+ rv = u' ' + rv
+ if _environment.autoescape:
+ rv = Markup(rv)
+ return rv
def do_capitalize(s):
def do_dictsort(value, case_sensitive=False, by='key'):
- """ Sort a dict and yield (key, value) pairs. Because python dicts are
+ """Sort a dict and yield (key, value) pairs. Because python dicts are
unsorted you may want to use this function to order them by either
key or value:
'"key" or "value"')
def sort_func(item):
value = item[pos]
- if isinstance(value, basestring):
- value = unicode(value)
- if not case_sensitive:
- value = value.lower()
+ if isinstance(value, basestring) and not case_sensitive:
+ value = value.lower()
return value
return sorted(value.items(), key=sort_func)
+def do_sort(value, case_sensitive=False):
+ """Sort an iterable. If the iterable is made of strings the second
+ parameter can be used to control the case sensitiveness of the
+ comparison which is disabled by default.
+
+ .. sourcecode:: jinja
+
+ {% for item in iterable|sort %}
+ ...
+ {% endfor %}
+ """
+ if not case_sensitive:
+ def sort_func(item):
+ if isinstance(item, basestring):
+ item = item.lower()
+ return item
+ else:
+ sort_func = None
+ return sorted(seq, key=sort_func)
+
+
def do_default(value, default_value=u'', boolean=False):
"""If the value is undefined it will return the passed default value,
otherwise the value of the variable:
return value
-def do_join(value, d=u''):
+@environmentfilter
+def do_join(environment, value, d=u''):
"""Return a string which is the concatenation of the strings in the
sequence. The separator between elements is an empty string per
- default, you can define ith with the optional parameter:
+ default, you can define it with the optional parameter:
.. sourcecode:: jinja
{{ [1, 2, 3]|join }}
-> 123
"""
+ # no automatic escaping? joining is a lot eaiser then
+ if not environment.autoescape:
+ return unicode(d).join(imap(unicode, value))
+
# if the delimiter doesn't have an html representation we check
# if any of the items has. If yes we do a coercion to Markup
- if not hasttr(d, '__html__'):
+ if not hasattr(d, '__html__'):
value = list(value)
do_escape = False
for idx, item in enumerate(value):
@environmentfilter
def do_first(environment, seq):
- """Return the frist item of a sequence."""
+ """Return the first item of a sequence."""
try:
return iter(seq).next()
except StopIteration:
return environment.undefined('No random item, sequence was empty.')
-def do_filesizeformat(value):
+def do_filesizeformat(value, binary=False):
"""Format the value like a 'human-readable' file size (i.e. 13 KB,
- 4.1 MB, 102 bytes, etc).
+ 4.1 MB, 102 bytes, etc). Per default decimal prefixes are used (mega,
+ giga, etc.), if the second parameter is set to `True` the binary
+ prefixes are used (mebi, gibi).
"""
- # fail silently
- try:
- bytes = float(value)
- except TypeError:
- bytes = 0
-
- if bytes < 1024:
+ bytes = float(value)
+ base = binary and 1024 or 1000
+ middle = binary and 'i' or ''
+ if bytes < base:
return "%d Byte%s" % (bytes, bytes != 1 and 's' or '')
- elif bytes < 1024 * 1024:
- return "%.1f KB" % (bytes / 1024)
- elif bytes < 1024 * 1024 * 1024:
- return "%.1f MB" % (bytes / (1024 * 1024))
- return "%.1f GB" % (bytes / (1024 * 1024 * 1024))
+ elif bytes < base * base:
+ return "%.1f K%sB" % (bytes / base, middle)
+ elif bytes < base * base * base:
+ return "%.1f M%sB" % (bytes / (base * base), middle)
+ return "%.1f G%sB" % (bytes / (base * base * base), middle)
def do_pprint(value, verbose=False):
return pformat(value, verbose=verbose)
-def do_urlize(value, trim_url_limit=None, nofollow=False):
+@environmentfilter
+def do_urlize(environment, value, trim_url_limit=None, nofollow=False):
"""Converts URLs in plain text into clickable links.
If you pass the filter an additional integer it will shorten the urls
.. sourcecode:: jinja
- {{ mytext|urlize(40, True) }}
+ {{ mytext|urlize(40, true) }}
links are shortened to 40 chars and defined with rel="nofollow"
"""
- return urlize(soft_unicode(value), trim_url_limit, nofollow)
+ rv = urlize(value, trim_url_limit, nofollow)
+ if environment.autoescape:
+ rv = Markup(rv)
+ return rv
def do_indent(s, width=4, indentfirst=False):
- """
- {{ s|indent[ width[ indentfirst[ usetab]]] }}
-
- Return a copy of the passed string, each line indented by
+ """Return a copy of the passed string, each line indented by
4 spaces. The first line is not indented. If you want to
change the number of spaces or indent the first line too
you can pass additional parameters to the filter:
.. sourcecode:: jinja
- {{ mytext|indent(2, True) }}
+ {{ mytext|indent(2, true) }}
indent by two spaces and indent the first line too.
"""
- indention = ' ' * width
+ indention = u' ' * width
+ rv = (u'\n' + indention).join(s.splitlines())
if indentfirst:
- return u'\n'.join(indention + line for line in s.splitlines())
- return s.replace('\n', '\n' + indention)
+ rv = indention + rv
+ return rv
def do_truncate(s, length=255, killwords=False, end='...'):
- """
- Return a truncated copy of the string. The length is specified
+ """Return a truncated copy of the string. The length is specified
with the first parameter which defaults to ``255``. If the second
parameter is ``true`` the filter will cut the text at length. Otherwise
it will try to save the last word. If the text was in fact
return u' '.join(result)
-def do_wordwrap(s, pos=79, hard=False):
+def do_wordwrap(s, width=79, break_long_words=True):
"""
Return a copy of the string passed to the filter wrapped after
- ``79`` characters. You can override this default using the first
- parameter. If you set the second parameter to `true` Jinja will
- also split words apart (usually a bad idea because it makes
- reading hard).
+ ``79`` characters. You can override this default using the first
+ parameter. If you set the second parameter to `false` Jinja will not
+ split words apart if they are longer than `width`.
"""
- if len(s) < pos:
- return s
- if hard:
- return u'\n'.join(s[idx:idx + pos] for idx in
- xrange(0, len(s), pos))
-
- # TODO: switch to wordwrap.wrap
- # code from http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/148061
- return reduce(lambda line, word, pos=pos: u'%s%s%s' %
- (line, u' \n'[(len(line)-line.rfind('\n') - 1 +
- len(word.split('\n', 1)[0]) >= pos)],
- word), s.split(' '))
+ import textwrap
+ return u'\n'.join(textwrap.wrap(s, width=width, expand_tabs=False,
+ replace_whitespace=False,
+ break_long_words=break_long_words))
def do_wordcount(s):
"""Count the words in that string."""
- return len(x for x in s.split() if x)
+ return len(_word_re.findall(s))
def do_int(value, default=0):
try:
return int(value)
except (TypeError, ValueError):
- return default
+ # this quirk is necessary so that "42.23"|int gives 42.
+ try:
+ return int(float(value))
+ except (TypeError, ValueError):
+ return default
def do_float(value, default=0.0):
return default
-def do_string(value):
- """Convert the value into an string."""
- return soft_unicode(value)
-
-
def do_format(value, *args, **kwargs):
"""
Apply python string formatting on an object:
{{ "%s - %s"|format("Hello?", "Foo!") }}
-> Hello? - Foo!
"""
- if kwargs:
- kwargs.update(idx, arg in enumerate(args))
- args = kwargs
- return soft_unicode(value) % args
+ if args and kwargs:
+ raise FilterArgumentError('can\'t handle positional and keyword '
+ 'arguments at the same time')
+ return soft_unicode(value) % (kwargs or args)
def do_trim(value):
def do_striptags(value):
"""Strip SGML/XML tags and replace adjacent whitespace by one space.
"""
- return ' '.join(_striptags_re.sub('', value).split())
+ if hasattr(value, '__html__'):
+ value = value.__html__()
+ return Markup(unicode(value)).striptags()
def do_slice(value, slices, fill_with=None):
"""Slice an iterator and return a list of lists containing
those items. Useful if you want to create a div containing
- three div tags that represent columns:
+ three ul tags that represent columns:
.. sourcecode:: html+jinja
If you pass it a second argument it's used to fill missing
values on the last iteration.
"""
- seq = list(seq)
+ seq = list(value)
length = len(seq)
items_per_slice = length // slices
slices_with_extra = length % slices
{%- for row in items|batch(3, ' ') %}
<tr>
{%- for column in row %}
- <tr>{{ column }}</td>
+ <td>{{ column }}</td>
{%- endfor %}
</tr>
{%- endfor %}
def do_sort(value, reverse=False):
"""Sort a sequence. Per default it sorts ascending, if you pass it
- `True` as first argument it will reverse the sorting.
+ true as first argument it will reverse the sorting.
"""
return sorted(value, reverse=reverse)
{% endfor %}
</ul>
+ Additionally it's possible to use tuple unpacking for the grouper and
+ list:
+
+ .. sourcecode:: html+jinja
+
+ <ul>
+ {% for grouper, list in persons|groupby('gender') %}
+ ...
+ {% endfor %}
+ </ul>
+
As you can see the item we're grouping by is stored in the `grouper`
attribute and the `list` contains all the objects that have this grouper
in common.
"""
- expr = lambda x: environment.subscribe(x, attribute)
- return sorted([{
- 'grouper': a,
- 'list': b
- } for a, b in groupby(sorted(value, key=expr), expr)],
- key=itemgetter('grouper'))
+ expr = lambda x: environment.getitem(x, attribute)
+ return sorted(map(_GroupTuple, groupby(sorted(value, key=expr), expr)))
+
+
+class _GroupTuple(tuple):
+ __slots__ = ()
+ grouper = property(itemgetter(0))
+ list = property(itemgetter(1))
+
+ def __new__(cls, (key, value)):
+ return tuple.__new__(cls, (key, list(value)))
+
+
+def do_list(value):
+ """Convert the value into a list. If it was a string the returned list
+ will be a list of characters.
+ """
+ return list(value)
+
+
+def do_mark_safe(value):
+ """Mark the value as safe which means that in an environment with automatic
+ escaping enabled this variable will not be escaped.
+ """
+ return Markup(value)
+
+
+def do_mark_unsafe(value):
+ """Mark a value as unsafe. This is the reverse operation for :func:`safe`."""
+ return unicode(value)
+
+
+def do_reverse(value):
+ """Reverse the object or return an iterator the iterates over it the other
+ way round.
+ """
+ if isinstance(value, basestring):
+ return value[::-1]
+ try:
+ return reversed(value)
+ except TypeError:
+ try:
+ rv = list(value)
+ rv.reverse()
+ return rv
+ except TypeError:
+ raise FilterArgumentError('argument must be iterable')
+
+
+@environmentfilter
+def do_attr(environment, obj, name):
+ """Get an attribute of an object. ``foo|attr("bar")`` works like
+ ``foo["bar"]`` just that always an attribute is returned and items are not
+ looked up.
+
+ See :ref:`Notes on subscriptions <notes-on-subscriptions>` for more details.
+ """
+ try:
+ name = str(name)
+ except UnicodeError:
+ pass
+ else:
+ try:
+ value = getattr(obj, name)
+ except AttributeError:
+ pass
+ else:
+ if environment.sandboxed and not \
+ environment.is_safe_attribute(obj, name, value):
+ return environment.unsafe_undefined(obj, name)
+ return value
+ return environment.undefined(obj=obj, name=name)
FILTERS = {
+ 'attr': do_attr,
'replace': do_replace,
'upper': do_upper,
'lower': do_lower,
'escape': escape,
'e': escape,
- 'xmlattr': do_xmlattr,
+ 'forceescape': do_forceescape,
'capitalize': do_capitalize,
'title': do_title,
'default': do_default,
+ 'd': do_default,
'join': do_join,
'count': len,
'dictsort': do_dictsort,
+ 'sort': do_sort,
'length': len,
- 'reverse': reversed,
+ 'reverse': do_reverse,
'center': do_center,
+ 'indent': do_indent,
'title': do_title,
'capitalize': do_capitalize,
'first': do_first,
'wordcount': do_wordcount,
'int': do_int,
'float': do_float,
- 'string': do_string,
+ 'string': soft_unicode,
+ 'list': do_list,
'urlize': do_urlize,
'format': do_format,
'trim': do_trim,
'round': do_round,
'sort': do_sort,
'groupby': do_groupby,
- 'safe': Markup
+ 'safe': do_mark_safe,
+ 'xmlattr': do_xmlattr
}
projects / jinja2.git / blobdiff