114 lines
3.5 KiB
Python
114 lines
3.5 KiB
Python
# Taken from https://github.com/jazzband/django-taggit/blob/3b56adb637ab95aca5036c37a358402c825a367c/taggit/utils.py
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def parse_tags(tagstring):
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"""
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Parses tag input, with multiple word input being activated and
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delineated by commas and double quotes. Quotes take precedence, so
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they may contain commas.
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Returns a sorted list of unique tag names.
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Ported from Jonathan Buchanan's `django-tagging
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<http://django-tagging.googlecode.com/>`_
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"""
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if not tagstring:
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return []
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# Special case - if there are no commas or double quotes in the
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# input, we don't *do* a recall... I mean, we know we only need to
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# split on spaces.
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if "," not in tagstring and '"' not in tagstring:
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words = list(set(split_strip(tagstring, " ")))
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words.sort()
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return words
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words = []
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buffer = []
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# Defer splitting of non-quoted sections until we know if there are
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# any unquoted commas.
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to_be_split = []
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saw_loose_comma = False
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open_quote = False
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i = iter(tagstring)
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try:
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while True:
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c = next(i)
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if c == '"':
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if buffer:
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to_be_split.append("".join(buffer))
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buffer = []
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# Find the matching quote
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open_quote = True
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c = next(i)
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while c != '"':
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buffer.append(c)
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c = next(i)
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if buffer:
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word = "".join(buffer).strip()
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if word:
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words.append(word)
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buffer = []
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open_quote = False
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else:
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if not saw_loose_comma and c == ",":
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saw_loose_comma = True
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buffer.append(c)
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except StopIteration:
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# If we were parsing an open quote which was never closed treat
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# the buffer as unquoted.
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if buffer:
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if open_quote and "," in buffer:
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saw_loose_comma = True
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to_be_split.append("".join(buffer))
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if to_be_split:
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if saw_loose_comma:
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delimiter = ","
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else:
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delimiter = " "
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for chunk in to_be_split:
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words.extend(split_strip(chunk, delimiter))
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words = list(set(words))
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words.sort()
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return words
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def split_strip(string, delimiter=","):
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"""
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Splits ``string`` on ``delimiter``, stripping each resulting string
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and returning a list of non-empty strings.
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Ported from Jonathan Buchanan's `django-tagging
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<http://django-tagging.googlecode.com/>`_
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"""
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if not string:
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return []
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words = [w.strip() for w in string.split(delimiter)]
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return [w for w in words if w]
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def edit_string_for_tags(tags):
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"""
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Given list of ``Tag`` instances, creates a string representation of
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the list suitable for editing by the user, such that submitting the
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given string representation back without changing it will give the
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same list of tags.
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Tag names which contain commas will be double quoted.
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If any tag name which isn't being quoted contains whitespace, the
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resulting string of tag names will be comma-delimited, otherwise
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it will be space-delimited.
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Ported from Jonathan Buchanan's `django-tagging
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<http://django-tagging.googlecode.com/>`_
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"""
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names = []
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for tag in tags:
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name = tag.name
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if "," in name or " " in name:
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names.append('"%s"' % name)
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else:
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names.append(name)
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return ", ".join(sorted(names))
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