700 lines
21 KiB
Python
700 lines
21 KiB
Python
"""Default variable filters."""
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import re
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import random as random_module
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from django.template import Variable, Library
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from django.conf import settings
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from django.utils.translation import ugettext, ungettext
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from django.utils.encoding import force_unicode, iri_to_uri
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register = Library()
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#######################
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# STRING DECORATOR #
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#######################
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def stringfilter(func):
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"""
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Decorator for filters which should only receive unicode objects. The object
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passed as the first positional argument will be converted to a unicode
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object.
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"""
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def _dec(*args, **kwargs):
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if args:
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args = list(args)
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args[0] = force_unicode(args[0])
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return func(*args, **kwargs)
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# Include a reference to the real function (used to check original
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# arguments by the template parser).
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_dec._decorated_function = getattr(func, '_decorated_function', func)
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return _dec
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###################
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# STRINGS #
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###################
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def addslashes(value):
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"""Adds slashes - useful for passing strings to JavaScript, for example."""
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return value.replace('\\', '\\\\').replace('"', '\\"').replace("'", "\\'")
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addslashes = stringfilter(addslashes)
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def capfirst(value):
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"""Capitalizes the first character of the value."""
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return value and value[0].upper() + value[1:]
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capfirst = stringfilter(capfirst)
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def fix_ampersands(value):
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"""Replaces ampersands with ``&`` entities."""
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from django.utils.html import fix_ampersands
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return fix_ampersands(value)
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fix_ampersands = stringfilter(fix_ampersands)
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def floatformat(text, arg=-1):
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"""
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Displays a float to a specified number of decimal places.
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If called without an argument, it displays the floating point number with
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one decimal place -- but only if there's a decimal place to be displayed:
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* num1 = 34.23234
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* num2 = 34.00000
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* num3 = 34.26000
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* {{ num1|floatformat }} displays "34.2"
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* {{ num2|floatformat }} displays "34"
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* {{ num3|floatformat }} displays "34.3"
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If arg is positive, it will always display exactly arg number of decimal
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places:
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* {{ num1|floatformat:3 }} displays "34.232"
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* {{ num2|floatformat:3 }} displays "34.000"
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* {{ num3|floatformat:3 }} displays "34.260"
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If arg is negative, it will display arg number of decimal places -- but
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only if there are places to be displayed:
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* {{ num1|floatformat:"-3" }} displays "34.232"
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* {{ num2|floatformat:"-3" }} displays "34"
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* {{ num3|floatformat:"-3" }} displays "34.260"
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"""
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try:
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f = float(text)
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except ValueError:
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return u''
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try:
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d = int(arg)
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except ValueError:
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return force_unicode(f)
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m = f - int(f)
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if not m and d < 0:
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return u'%d' % int(f)
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else:
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formatstr = u'%%.%df' % abs(d)
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return formatstr % f
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def iriencode(value):
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"""Escapes an IRI value for use in a URL."""
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return force_unicode(iri_to_uri(value))
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iriencode = stringfilter(iriencode)
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def linenumbers(value):
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"""Displays text with line numbers."""
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from django.utils.html import escape
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lines = value.split(u'\n')
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# Find the maximum width of the line count, for use with zero padding
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# string format command.
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width = unicode(len(unicode(len(lines))))
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for i, line in enumerate(lines):
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lines[i] = (u"%0" + width + u"d. %s") % (i + 1, escape(line))
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return u'\n'.join(lines)
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linenumbers = stringfilter(linenumbers)
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def lower(value):
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"""Converts a string into all lowercase."""
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return value.lower()
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lower = stringfilter(lower)
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def make_list(value):
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"""
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Returns the value turned into a list.
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For an integer, it's a list of digits.
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For a string, it's a list of characters.
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"""
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return list(value)
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make_list = stringfilter(make_list)
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def slugify(value):
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"""
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Normalizes string, converts to lowercase, removes non-alpha characters,
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and converts spaces to hyphens.
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"""
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import unicodedata
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value = unicodedata.normalize('NFKD', value).encode('ascii', 'ignore')
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value = unicode(re.sub('[^\w\s-]', '', value).strip().lower())
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return re.sub('[-\s]+', '-', value)
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slugify = stringfilter(slugify)
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def stringformat(value, arg):
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"""
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Formats the variable according to the arg, a string formatting specifier.
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This specifier uses Python string formating syntax, with the exception that
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the leading "%" is dropped.
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See http://docs.python.org/lib/typesseq-strings.html for documentation
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of Python string formatting
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"""
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try:
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return (u"%" + unicode(arg)) % value
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except (ValueError, TypeError):
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return u""
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def title(value):
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"""Converts a string into titlecase."""
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return re.sub("([a-z])'([A-Z])", lambda m: m.group(0).lower(), value.title())
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title = stringfilter(title)
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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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Argument: Number of words to truncate after.
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"""
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from django.utils.text import truncate_words
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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 truncate_words(value, length)
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truncatewords = stringfilter(truncatewords)
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def truncatewords_html(value, arg):
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"""
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Truncates HTML after a certain number of words.
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Argument: Number of words to truncate after.
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"""
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from django.utils.text import truncate_html_words
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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 truncate_html_words(value, length)
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truncatewords_html = stringfilter(truncatewords_html)
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def upper(value):
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"""Converts a string into all uppercase."""
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return value.upper()
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upper = stringfilter(upper)
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def urlencode(value):
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"""Escapes a value for use in a URL."""
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from django.utils.http import urlquote
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return urlquote(value)
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urlencode = stringfilter(urlencode)
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def urlize(value):
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"""Converts URLs in plain text into clickable links."""
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from django.utils.html import urlize
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return urlize(value, nofollow=True)
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urlize = stringfilter(urlize)
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def urlizetrunc(value, limit):
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"""
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Converts URLs into clickable links, truncating URLs to the given character
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limit, and adding 'rel=nofollow' attribute to discourage spamming.
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Argument: Length to truncate URLs to.
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"""
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from django.utils.html import urlize
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return urlize(value, trim_url_limit=int(limit), nofollow=True)
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urlizetrunc = stringfilter(urlizetrunc)
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def wordcount(value):
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"""Returns the number of words."""
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return len(value.split())
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wordcount = stringfilter(wordcount)
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def wordwrap(value, arg):
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"""
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Wraps words at specified line length.
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Argument: number of characters to wrap the text at.
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"""
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from django.utils.text import wrap
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return wrap(value, int(arg))
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wordwrap = stringfilter(wordwrap)
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def ljust(value, arg):
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"""
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Left-aligns the value in a field of a given width.
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Argument: field size.
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"""
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return value.ljust(int(arg))
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ljust = stringfilter(ljust)
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def rjust(value, arg):
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"""
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Right-aligns the value in a field of a given width.
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Argument: field size.
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"""
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return value.rjust(int(arg))
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rjust = stringfilter(rjust)
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def center(value, arg):
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"""Centers the value in a field of a given width."""
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return value.center(int(arg))
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center = stringfilter(center)
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def cut(value, arg):
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"""Removes all values of arg from the given string."""
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return value.replace(arg, u'')
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cut = stringfilter(cut)
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###################
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# HTML STRINGS #
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###################
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def escape(value):
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"Escapes a string's HTML"
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from django.utils.html import escape
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return escape(value)
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escape = stringfilter(escape)
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def linebreaks(value):
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"""
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Replaces line breaks in plain text with appropriate HTML; a single
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newline becomes an HTML line break (``<br />``) and a new line
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followed by a blank line becomes a paragraph break (``</p>``).
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"""
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from django.utils.html import linebreaks
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return linebreaks(value)
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linebreaks = stringfilter(linebreaks)
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def linebreaksbr(value):
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"""
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Converts all newlines in a piece of plain text to HTML line breaks
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(``<br />``).
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"""
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return value.replace('\n', '<br />')
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linebreaksbr = stringfilter(linebreaksbr)
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def removetags(value, tags):
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"""Removes a space separated list of [X]HTML tags from the output."""
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tags = [re.escape(tag) for tag in tags.split()]
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tags_re = u'(%s)' % u'|'.join(tags)
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starttag_re = re.compile(ur'<%s(/?>|(\s+[^>]*>))' % tags_re, re.U)
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endtag_re = re.compile(u'</%s>' % tags_re)
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value = starttag_re.sub(u'', value)
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value = endtag_re.sub(u'', value)
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return value
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removetags = stringfilter(removetags)
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def striptags(value):
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"""Strips all [X]HTML tags."""
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from django.utils.html import strip_tags
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return strip_tags(value)
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striptags = stringfilter(striptags)
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###################
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# LISTS #
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###################
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def dictsort(value, arg):
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"""
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Takes a list of dicts, returns that list sorted by the property given in
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the argument.
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"""
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var_resolve = Variable(arg).resolve
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decorated = [(var_resolve(item), item) for item in value]
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decorated.sort()
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return [item[1] for item in decorated]
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def dictsortreversed(value, arg):
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"""
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Takes a list of dicts, returns that list sorted in reverse order by the
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property given in the argument.
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"""
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var_resolve = Variable(arg).resolve
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decorated = [(var_resolve(item), item) for item in value]
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decorated.sort()
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decorated.reverse()
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return [item[1] for item in decorated]
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def first(value):
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"""Returns the first item in a list."""
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try:
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return value[0]
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except IndexError:
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return u''
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def join(value, arg):
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"""Joins a list with a string, like Python's ``str.join(list)``."""
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try:
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return arg.join(map(force_unicode, value))
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except AttributeError: # fail silently but nicely
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return value
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def length(value):
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"""Returns the length of the value - useful for lists."""
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return len(value)
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def length_is(value, arg):
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"""Returns a boolean of whether the value's length is the argument."""
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return len(value) == int(arg)
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def random(value):
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"""Returns a random item from the list."""
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return random_module.choice(value)
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def slice_(value, arg):
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"""
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Returns a slice of the list.
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Uses the same syntax as Python's list slicing; see
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http://diveintopython.org/native_data_types/lists.html#odbchelper.list.slice
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for an introduction.
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"""
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try:
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bits = []
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for x in arg.split(u':'):
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if len(x) == 0:
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bits.append(None)
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else:
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bits.append(int(x))
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return value[slice(*bits)]
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except (ValueError, TypeError):
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return value # Fail silently.
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def unordered_list(value):
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"""
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Recursively takes a self-nested list and returns an HTML unordered list --
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WITHOUT opening and closing <ul> tags.
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The list is assumed to be in the proper format. For example, if ``var``
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contains: ``['States', ['Kansas', ['Lawrence', 'Topeka'], 'Illinois']]``,
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then ``{{ var|unordered_list }}`` would return::
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<li>States
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<ul>
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<li>Kansas
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<ul>
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<li>Lawrence</li>
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<li>Topeka</li>
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</ul>
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</li>
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<li>Illinois</li>
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</ul>
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</li>
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"""
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def convert_old_style_list(list_):
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"""
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Converts old style lists to the new easier to understand format.
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The old list format looked like:
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['Item 1', [['Item 1.1', []], ['Item 1.2', []]]
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And it is converted to:
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['Item 1', ['Item 1.1', 'Item 1.2]]
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"""
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if not isinstance(list_, (tuple, list)) or len(list_) != 2:
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return list_, False
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first_item, second_item = list_
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if second_item == []:
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return [first_item], True
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old_style_list = True
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new_second_item = []
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for sublist in second_item:
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item, old_style_list = convert_old_style_list(sublist)
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if not old_style_list:
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break
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new_second_item.extend(item)
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if old_style_list:
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second_item = new_second_item
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return [first_item, second_item], old_style_list
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def _helper(list_, tabs=1):
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indent = u'\t' * tabs
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output = []
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list_length = len(list_)
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i = 0
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while i < list_length:
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title = list_[i]
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sublist = ''
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sublist_item = None
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if isinstance(title, (list, tuple)):
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sublist_item = title
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title = ''
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elif i < list_length - 1:
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next_item = list_[i+1]
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if next_item and isinstance(next_item, (list, tuple)):
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# The next item is a sub-list.
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sublist_item = next_item
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# We've processed the next item now too.
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i += 1
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if sublist_item:
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sublist = _helper(sublist_item, tabs+1)
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sublist = '\n%s<ul>\n%s\n%s</ul>\n%s' % (indent, sublist,
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indent, indent)
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output.append('%s<li>%s%s</li>' % (indent, force_unicode(title),
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sublist))
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i += 1
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return '\n'.join(output)
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value, converted = convert_old_style_list(value)
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return _helper(value)
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###################
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# INTEGERS #
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###################
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def add(value, arg):
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"""Adds the arg to the value."""
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return int(value) + int(arg)
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def get_digit(value, arg):
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"""
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Given a whole number, returns the requested digit of it, where 1 is the
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right-most digit, 2 is the second-right-most digit, etc. Returns the
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original value for invalid input (if input or argument is not an integer,
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or if argument is less than 1). Otherwise, output is always an integer.
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"""
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try:
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arg = int(arg)
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value = int(value)
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except ValueError:
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return value # Fail silently for an invalid argument
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if arg < 1:
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return value
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try:
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return int(str(value)[-arg])
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except IndexError:
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return 0
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###################
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# DATES #
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###################
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def date(value, arg=None):
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"""Formats a date according to the given format."""
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from django.utils.dateformat import format
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if not value:
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return u''
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if arg is None:
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arg = settings.DATE_FORMAT
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return format(value, arg)
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def time(value, arg=None):
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"""Formats a time according to the given format."""
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from django.utils.dateformat import time_format
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if value in (None, u''):
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return u''
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if arg is None:
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arg = settings.TIME_FORMAT
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return time_format(value, arg)
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def timesince(value, arg=None):
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"""Formats a date as the time since that date (i.e. "4 days, 6 hours")."""
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from django.utils.timesince import timesince
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if not value:
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return u''
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if arg:
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return timesince(arg, value)
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return timesince(value)
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def timeuntil(value, arg=None):
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"""Formats a date as the time until that date (i.e. "4 days, 6 hours")."""
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from django.utils.timesince import timesince
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from datetime import datetime
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if not value:
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return u''
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if arg:
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return timesince(arg, value)
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return timesince(datetime.now(), value)
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###################
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# LOGIC #
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###################
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def default(value, arg):
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"""If value is unavailable, use given default."""
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return value or arg
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def default_if_none(value, arg):
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"""If value is None, use given default."""
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if value is None:
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return arg
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return value
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def divisibleby(value, arg):
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"""Returns True if the value is devisible by the argument."""
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return int(value) % int(arg) == 0
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def yesno(value, arg=None):
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"""
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Given a string mapping values for true, false and (optionally) None,
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returns one of those strings accoding to the value:
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========== ====================== ==================================
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Value Argument Outputs
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========== ====================== ==================================
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``True`` ``"yeah,no,maybe"`` ``yeah``
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``False`` ``"yeah,no,maybe"`` ``no``
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``None`` ``"yeah,no,maybe"`` ``maybe``
|
|
``None`` ``"yeah,no"`` ``"no"`` (converts None to False
|
|
if no mapping for None is given.
|
|
========== ====================== ==================================
|
|
"""
|
|
if arg is None:
|
|
arg = ugettext('yes,no,maybe')
|
|
bits = arg.split(u',')
|
|
if len(bits) < 2:
|
|
return value # Invalid arg.
|
|
try:
|
|
yes, no, maybe = bits
|
|
except ValueError:
|
|
# Unpack list of wrong size (no "maybe" value provided).
|
|
yes, no, maybe = bits[0], bits[1], bits[1]
|
|
if value is None:
|
|
return maybe
|
|
if value:
|
|
return yes
|
|
return no
|
|
|
|
###################
|
|
# MISC #
|
|
###################
|
|
|
|
def filesizeformat(bytes):
|
|
"""
|
|
Formats the value like a 'human-readable' file size (i.e. 13 KB, 4.1 MB,
|
|
102 bytes, etc).
|
|
"""
|
|
try:
|
|
bytes = float(bytes)
|
|
except TypeError:
|
|
return u"0 bytes"
|
|
|
|
if bytes < 1024:
|
|
return ungettext("%(size)d byte", "%(size)d bytes", bytes) % {'size': bytes}
|
|
if bytes < 1024 * 1024:
|
|
return ugettext("%.1f KB") % (bytes / 1024)
|
|
if bytes < 1024 * 1024 * 1024:
|
|
return ugettext("%.1f MB") % (bytes / (1024 * 1024))
|
|
return ugettext("%.1f GB") % (bytes / (1024 * 1024 * 1024))
|
|
|
|
def pluralize(value, arg=u's'):
|
|
"""
|
|
Returns a plural suffix if the value is not 1. By default, 's' is used as
|
|
the suffix:
|
|
|
|
* If value is 0, vote{{ value|plurlize }} displays "0 votes".
|
|
* If value is 1, vote{{ value|plurlize }} displays "1 vote".
|
|
* If value is 2, vote{{ value|plurlize }} displays "2 votes".
|
|
|
|
If an argument is provided, that string is used instead:
|
|
|
|
* If value is 0, class{{ value|plurlize:"es" }} displays "0 classes".
|
|
* If value is 1, class{{ value|plurlize:"es" }} displays "1 class".
|
|
* If value is 2, class{{ value|plurlize:"es" }} displays "2 classes".
|
|
|
|
If the provided argument contains a comma, the text before the comma is
|
|
used for the singular case and the text after the comma is used for the
|
|
plural case:
|
|
|
|
* If value is 0, cand{{ value|plurlize:"y,ies" }} displays "0 candies".
|
|
* If value is 1, cand{{ value|plurlize:"y,ies" }} displays "1 candy".
|
|
* If value is 2, cand{{ value|plurlize:"y,ies" }} displays "2 candies".
|
|
"""
|
|
if not u',' in arg:
|
|
arg = u',' + arg
|
|
bits = arg.split(u',')
|
|
if len(bits) > 2:
|
|
return u''
|
|
singular_suffix, plural_suffix = bits[:2]
|
|
|
|
try:
|
|
if int(value) != 1:
|
|
return plural_suffix
|
|
except ValueError: # Invalid string that's not a number.
|
|
pass
|
|
except TypeError: # Value isn't a string or a number; maybe it's a list?
|
|
try:
|
|
if len(value) != 1:
|
|
return plural_suffix
|
|
except TypeError: # len() of unsized object.
|
|
pass
|
|
return singular_suffix
|
|
|
|
def phone2numeric(value):
|
|
"""Takes a phone number and converts it in to its numerical equivalent."""
|
|
from django.utils.text import phone2numeric
|
|
return phone2numeric(value)
|
|
|
|
def pprint(value):
|
|
"""A wrapper around pprint.pprint -- for debugging, really."""
|
|
from pprint import pformat
|
|
try:
|
|
return pformat(value)
|
|
except Exception, e:
|
|
return u"Error in formatting: %s" % force_unicode(e, errors="replace")
|
|
|
|
# Syntax: register.filter(name of filter, callback)
|
|
register.filter(add)
|
|
register.filter(addslashes)
|
|
register.filter(capfirst)
|
|
register.filter(center)
|
|
register.filter(cut)
|
|
register.filter(date)
|
|
register.filter(default)
|
|
register.filter(default_if_none)
|
|
register.filter(dictsort)
|
|
register.filter(dictsortreversed)
|
|
register.filter(divisibleby)
|
|
register.filter(escape)
|
|
register.filter(filesizeformat)
|
|
register.filter(first)
|
|
register.filter(fix_ampersands)
|
|
register.filter(floatformat)
|
|
register.filter(get_digit)
|
|
register.filter(iriencode)
|
|
register.filter(join)
|
|
register.filter(length)
|
|
register.filter(length_is)
|
|
register.filter(linebreaks)
|
|
register.filter(linebreaksbr)
|
|
register.filter(linenumbers)
|
|
register.filter(ljust)
|
|
register.filter(lower)
|
|
register.filter(make_list)
|
|
register.filter(phone2numeric)
|
|
register.filter(pluralize)
|
|
register.filter(pprint)
|
|
register.filter(removetags)
|
|
register.filter(random)
|
|
register.filter(rjust)
|
|
register.filter('slice', slice_)
|
|
register.filter(slugify)
|
|
register.filter(stringformat)
|
|
register.filter(striptags)
|
|
register.filter(time)
|
|
register.filter(timesince)
|
|
register.filter(timeuntil)
|
|
register.filter(title)
|
|
register.filter(truncatewords)
|
|
register.filter(truncatewords_html)
|
|
register.filter(unordered_list)
|
|
register.filter(upper)
|
|
register.filter(urlencode)
|
|
register.filter(urlize)
|
|
register.filter(urlizetrunc)
|
|
register.filter(wordcount)
|
|
register.filter(wordwrap)
|
|
register.filter(yesno)
|