Fixed #5025 -- Add a "truncatechars" template filter. Many thanks to Chris Beaven.
git-svn-id: http://code.djangoproject.com/svn/django/trunk@16542 bcc190cf-cafb-0310-a4f2-bffc1f526a37
This commit is contained in:
Jannis Leidel
parent
12b7c2a702
commit
3b77458371
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@ -9,7 +9,7 @@ from django.forms.widgets import RadioFieldRenderer
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from django.forms.util import flatatt
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from django.templatetags.static import static
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from django.utils.html import escape
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from django.utils.text import truncate_words
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from django.utils.text import Truncator
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from django.utils.translation import ugettext as _
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from django.utils.safestring import mark_safe
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from django.utils.encoding import force_unicode
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@ -152,7 +152,7 @@ class ForeignKeyRawIdWidget(forms.TextInput):
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key = self.rel.get_related_field().name
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try:
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obj = self.rel.to._default_manager.using(self.db).get(**{key: value})
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return ' <strong>%s</strong>' % escape(truncate_words(obj, 14))
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return ' <strong>%s</strong>' % escape(Truncator(obj).words(14, truncate='...'))
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except (ValueError, self.rel.to.DoesNotExist):
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return ''
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@ -15,7 +15,7 @@ from django.utils.encoding import force_unicode, iri_to_uri
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from django.utils.html import (conditional_escape, escapejs, fix_ampersands,
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escape, urlize as urlize_impl, linebreaks, strip_tags)
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from django.utils.http import urlquote
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from django.utils.text import truncate_words, truncate_html_words, wrap, phone2numeric
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from django.utils.text import Truncator, wrap, phone2numeric
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from django.utils.safestring import mark_safe, SafeData, mark_for_escaping
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from django.utils.timesince import timesince, timeuntil
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from django.utils.translation import ugettext, ungettext
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@ -244,6 +244,20 @@ def title(value):
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title.is_safe = True
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title = stringfilter(title)
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def truncatechars(value, arg):
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"""
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Truncates a string after a certain number of characters.
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Argument: Number of characters to truncate after.
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"""
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try:
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length = int(arg)
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except ValueError: # Invalid literal for int().
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return value # Fail silently.
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return Truncator(value).chars(value, length)
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truncatechars.is_safe = True
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truncatechars = stringfilter(truncatechars)
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def truncatewords(value, arg):
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"""
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Truncates a string after a certain number of words.
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@ -256,7 +270,7 @@ def truncatewords(value, arg):
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length = int(arg)
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except ValueError: # Invalid literal for int().
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return value # Fail silently.
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return truncate_words(value, length)
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return Truncator(value).words(length, truncate=' ...')
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truncatewords.is_safe = True
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truncatewords = stringfilter(truncatewords)
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@ -272,7 +286,7 @@ def truncatewords_html(value, arg):
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length = int(arg)
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except ValueError: # invalid literal for int()
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return value # Fail silently.
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return truncate_html_words(value, length)
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return Truncator(value).words(length, html=True, truncate=' ...')
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truncatewords_html.is_safe = True
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truncatewords_html = stringfilter(truncatewords_html)
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@ -1,4 +1,6 @@
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import re
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import unicodedata
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import warnings
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from gzip import GzipFile
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from htmlentitydefs import name2codepoint
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@ -8,14 +10,18 @@ except ImportError:
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from StringIO import StringIO
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from django.utils.encoding import force_unicode
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from django.utils.functional import allow_lazy
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from django.utils.translation import ugettext_lazy, ugettext as _
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from django.utils.functional import allow_lazy, SimpleLazyObject
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from django.utils.translation import ugettext_lazy, ugettext as _, pgettext
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# Capitalizes the first letter of a string.
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capfirst = lambda x: x and force_unicode(x)[0].upper() + force_unicode(x)[1:]
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capfirst = allow_lazy(capfirst, unicode)
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# Set up regular expressions
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re_words = re.compile(r'&.*?;|<.*?>|(\w[\w-]*)', re.U)
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re_tag = re.compile(r'<(/)?([^ ]+?)(?: (/)| .*?)?>')
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def wrap(text, width):
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"""
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A word-wrap function that preserves existing line breaks and most spaces in
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@ -44,46 +50,114 @@ def wrap(text, width):
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return u''.join(_generator())
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wrap = allow_lazy(wrap, unicode)
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def truncate_words(s, num, end_text='...'):
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"""Truncates a string after a certain number of words. Takes an optional
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class Truncator(SimpleLazyObject):
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"""
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An object used to truncate text, either by characters or words.
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"""
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def __init__(self, text):
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super(Truncator, self).__init__(lambda: force_unicode(text))
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def add_truncation_text(self, text, truncate=None):
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if truncate is None:
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truncate = pgettext(
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'String to return when truncating text',
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u'%(truncated_text)s...')
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truncate = force_unicode(truncate)
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if '%(truncated_text)s' in truncate:
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return truncate % {'truncated_text': text}
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# The truncation text didn't contain the %(truncated_text)s string
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# replacement argument so just append it to the text.
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if text.endswith(truncate):
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# But don't append the truncation text if the current text already
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# ends in this.
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return text
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return '%s%s' % (text, truncate)
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def chars(self, num, truncate=None):
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"""
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Returns the text truncated to be no longer than the specified number
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of characters.
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Takes an optional argument of what should be used to notify that the
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string has been truncated, defaulting to a translatable string of an
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ellipsis (...).
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"""
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length = int(num)
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text = unicodedata.normalize('NFC', self._wrapped)
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# Calculate the length to truncate to (max length - end_text length)
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truncate_len = length
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for char in self.add_truncation_text('', truncate):
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if not unicodedata.combining(char):
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truncate_len -= 1
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if truncate_len == 0:
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break
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s_len = 0
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end_index = None
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for i, char in enumerate(text):
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if unicodedata.combining(char):
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# Don't consider combining characters
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# as adding to the string length
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continue
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s_len += 1
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if end_index is None and s_len > truncate_len:
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end_index = i
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if s_len > length:
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# Return the truncated string
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return self.add_truncation_text(text[:end_index or 0],
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truncate)
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# Return the original string since no truncation was necessary
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return text
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chars = allow_lazy(chars)
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def words(self, num, truncate=None, html=False):
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"""
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Truncates a string after a certain number of words. Takes an optional
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argument of what should be used to notify that the string has been
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truncated, defaulting to ellipsis (...)
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truncated, defaulting to ellipsis (...).
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"""
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length = int(num)
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if html:
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return self._html_words(length, truncate)
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return self._text_words(length, truncate)
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words = allow_lazy(words)
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def _text_words(self, length, truncate):
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"""
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Truncates a string after a certain number of words.
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Newlines in the string will be stripped.
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"""
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s = force_unicode(s)
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length = int(num)
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words = s.split()
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words = self._wrapped.split()
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if len(words) > length:
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words = words[:length]
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if not words[-1].endswith(end_text):
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words.append(end_text)
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return self.add_truncation_text(u' '.join(words), truncate)
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return u' '.join(words)
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truncate_words = allow_lazy(truncate_words, unicode)
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def truncate_html_words(s, num, end_text='...'):
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"""Truncates HTML to a certain number of words (not counting tags and
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comments). Closes opened tags if they were correctly closed in the given
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html. Takes an optional argument of what should be used to notify that the
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string has been truncated, defaulting to ellipsis (...).
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def _html_words(self, length, truncate):
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"""
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Truncates HTML to a certain number of words (not counting tags and
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comments). Closes opened tags if they were correctly closed in the
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given HTML.
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Newlines in the HTML are preserved.
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"""
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s = force_unicode(s)
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length = int(num)
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if length <= 0:
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return u''
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html4_singlets = ('br', 'col', 'link', 'base', 'img', 'param', 'area', 'hr', 'input')
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# Set up regular expressions
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re_words = re.compile(r'&.*?;|<.*?>|(\w[\w-]*)', re.U)
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re_tag = re.compile(r'<(/)?([^ ]+?)(?: (/)| .*?)?>')
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html4_singlets = (
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'br', 'col', 'link', 'base', 'img',
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'param', 'area', 'hr', 'input'
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)
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# Count non-HTML words and keep note of open tags
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pos = 0
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end_text_pos = 0
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words = 0
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open_tags = []
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while words <= length:
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m = re_words.search(s, pos)
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m = re_words.search(self._wrapped, pos)
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if not m:
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# Checked through whole string
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break
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@ -100,7 +174,8 @@ def truncate_html_words(s, num, end_text='...'):
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# Don't worry about non tags or tags after our truncate point
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continue
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closing_tag, tagname, self_closing = tag.groups()
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tagname = tagname.lower() # Element names are always case-insensitive
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# Element names are always case-insensitive
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tagname = tagname.lower()
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if self_closing or tagname in html4_singlets:
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pass
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elif closing_tag:
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@ -110,22 +185,37 @@ def truncate_html_words(s, num, end_text='...'):
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except ValueError:
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pass
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else:
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# SGML: An end tag closes, back to the matching start tag, all unclosed intervening start tags with omitted end tags
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# SGML: An end tag closes, back to the matching start tag,
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# all unclosed intervening start tags with omitted end tags
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open_tags = open_tags[i + 1:]
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else:
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# Add it to the start of the open tags list
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open_tags.insert(0, tagname)
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if words <= length:
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# Don't try to close tags if we don't need to truncate
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return s
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out = s[:end_text_pos]
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if end_text:
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out += ' ' + end_text
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return self._wrapped
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out = self._wrapped[:end_text_pos]
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truncate_text = self.add_truncation_text('', truncate)
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if truncate_text:
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out += truncate_text
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# Close any tags still open
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for tag in open_tags:
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out += '</%s>' % tag
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# Return string
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return out
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def truncate_words(s, num, end_text='...'):
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warnings.warn('This function has been deprecated. Use the Truncator class '
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'in django.utils.text instead.', category=PendingDeprecationWarning)
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truncate = end_text and ' %s' % end_text or ''
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return Truncator(s).words(num, truncate=truncate)
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truncate_words = allow_lazy(truncate_words, unicode)
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def truncate_html_words(s, num, end_text='...'):
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warnings.warn('This function has been deprecated. Use the Truncator class '
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'in django.utils.text instead.', category=PendingDeprecationWarning)
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truncate = end_text and ' %s' % end_text or ''
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return Truncator(s).words(num, truncate=truncate, html=True)
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truncate_html_words = allow_lazy(truncate_html_words, unicode)
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def get_valid_filename(s):
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@ -220,6 +220,12 @@ their deprecation, as per the :ref:`Django deprecation policy
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was deprecated since Django 1.4 and will be removed in favor of the
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generic static files handling.
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* The builin truncation functions
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:func:`django.utils.text.truncate_words` and
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:func:`django.utils.text.truncate_html_words`
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were deprecated since Django 1.4 and will be removed in favor
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of the ``django.utils.text.Truncator`` class.
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* 2.0
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* ``django.views.defaults.shortcut()``. This function has been moved
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to ``django.contrib.contenttypes.views.shortcut()`` as part of the
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@ -2055,6 +2055,24 @@ For example::
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If ``value`` is ``"my first post"``, the output will be ``"My First Post"``.
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.. templatefilter:: truncatechars
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truncatechars
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^^^^^^^^^^^^^
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.. versionadded:: 1.4
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Truncates a string if it is longer than the specified number of characters.
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Truncated strings will end with a translatable ellipsis sequence ("...").
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**Argument:** Number of characters to truncate to
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For example::
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{{ value|truncatechars:9 }}
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If ``value`` is ``"Joel is a slug"``, the output will be ``"Joel i..."``.
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.. templatefilter:: truncatewords
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truncatewords
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@ -145,6 +145,14 @@ A new helper function,
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``template.Library`` to ease the creation of template tags that store some
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data in a specified context variable.
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``truncatechars`` template filter
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Added a filter which truncates a string to be no longer than the specified
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number of characters. Truncated strings end with a translatable ellipsis
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sequence ("..."). See the :tfilter:`truncatechars docs <truncatechars>` for
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more details.
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CSRF improvements
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~~~~~~~~~~~~~~~~~
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@ -1,10 +1,69 @@
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# -*- coding: utf-8 -*-
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import unittest
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from django.utils import text
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class TestUtilsText(unittest.TestCase):
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def test_truncate_chars(self):
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truncator = text.Truncator(
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u'The quick brown fox jumped over the lazy dog.'
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)
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self.assertEqual(u'The quick brown fox jumped over the lazy dog.',
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truncator.chars(100)),
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self.assertEqual(u'The quick brown fox ...',
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truncator.chars(23)),
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self.assertEqual(u'The quick brown fo.....',
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truncator.chars(23, '.....')),
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# Ensure that we normalize our unicode data first
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nfc = text.Truncator(u'o\xfco\xfco\xfco\xfc')
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nfd = text.Truncator(u'ou\u0308ou\u0308ou\u0308ou\u0308')
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self.assertEqual(u'oüoüoüoü', nfc.chars(8))
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self.assertEqual(u'oüoüoüoü', nfd.chars(8))
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self.assertEqual(u'oü...', nfc.chars(5))
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self.assertEqual(u'oü...', nfd.chars(5))
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# Ensure the final length is calculated correctly when there are
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# combining characters with no precomposed form, and that combining
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# characters are not split up.
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truncator = text.Truncator(u'-B\u030AB\u030A----8')
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self.assertEqual(u'-B\u030A...', truncator.chars(5))
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self.assertEqual(u'-B\u030AB\u030A-...', truncator.chars(7))
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self.assertEqual(u'-B\u030AB\u030A----8', truncator.chars(8))
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# Ensure the length of the end text is correctly calculated when it
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# contains combining characters with no precomposed form.
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truncator = text.Truncator(u'-----')
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self.assertEqual(u'---B\u030A', truncator.chars(4, u'B\u030A'))
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self.assertEqual(u'-----', truncator.chars(5, u'B\u030A'))
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# Make a best effort to shorten to the desired length, but requesting
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# a length shorter than the ellipsis shouldn't break
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self.assertEqual(u'...', text.Truncator(u'asdf').chars(1))
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def test_truncate_words(self):
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truncator = text.Truncator(u'The quick brown fox jumped over the lazy '
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'dog.')
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self.assertEqual(u'The quick brown fox jumped over the lazy dog.',
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truncator.words(10))
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self.assertEqual(u'The quick brown fox...', truncator.words(4))
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self.assertEqual(u'The quick brown fox[snip]',
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truncator.words(4, '[snip]'))
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def test_truncate_html_words(self):
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truncator = text.Truncator('<p><strong><em>The quick brown fox jumped '
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'over the lazy dog.</em></strong></p>')
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self.assertEqual(u'<p><strong><em>The quick brown fox jumped over the '
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'lazy dog.</em></strong></p>', truncator.words(10, html=True))
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self.assertEqual(u'<p><strong><em>The quick brown fox...</em>'
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'</strong></p>', truncator.words(4, html=True))
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self.assertEqual(u'<p><strong><em>The quick brown fox....</em>'
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'</strong></p>', truncator.words(4, '....', html=True))
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self.assertEqual(u'<p><strong><em>The quick brown fox</em></strong>'
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'</p>', truncator.words(4, '', html=True))
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def test_old_truncate_words(self):
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self.assertEqual(u'The quick brown fox jumped over the lazy dog.',
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text.truncate_words(u'The quick brown fox jumped over the lazy dog.', 10))
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self.assertEqual(u'The quick brown fox ...',
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@ -12,7 +71,7 @@ class TestUtilsText(unittest.TestCase):
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self.assertEqual(u'The quick brown fox ....',
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text.truncate_words('The quick brown fox jumped over the lazy dog.', 4, '....'))
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def test_truncate_html_words(self):
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def test_old_truncate_html_words(self):
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self.assertEqual(u'<p><strong><em>The quick brown fox jumped over the lazy dog.</em></strong></p>',
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text.truncate_html_words('<p><strong><em>The quick brown fox jumped over the lazy dog.</em></strong></p>', 10))
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self.assertEqual(u'<p><strong><em>The quick brown fox ...</em></strong></p>',
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Reference in New Issue