author | Nishanth Amuluru <nishanth@fossee.in> |
Tue, 11 Jan 2011 12:36:55 +0530 | |
changeset 141 | ed2dadfc829a |
parent 69 | c6bca38c1cbf |
permissions | -rw-r--r-- |
69
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1 |
""" |
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Tagging utilities - from user tag input parsing to tag cloud |
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calculation. |
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""" |
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import math |
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import types |
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|
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from django.db.models.query import QuerySet |
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from django.utils.encoding import force_unicode |
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from django.utils.translation import ugettext as _ |
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|
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# Python 2.3 compatibility |
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try: |
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set |
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except NameError: |
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from sets import Set as set |
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|
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def parse_tag_input(input): |
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""" |
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Parses tag input, with multiple word input being activated and |
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21 |
delineated by commas and double quotes. Quotes take precedence, so |
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they may contain commas. |
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|
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Returns a sorted list of unique tag names. |
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""" |
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if not input: |
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return [] |
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|
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input = force_unicode(input) |
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|
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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 u',' not in input and u'"' not in input: |
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words = list(set(split_strip(input, u' '))) |
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words.sort() |
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return words |
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|
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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(input) |
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try: |
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while 1: |
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c = i.next() |
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if c == u'"': |
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if buffer: |
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to_be_split.append(u''.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 = i.next() |
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while c != u'"': |
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buffer.append(c) |
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c = i.next() |
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if buffer: |
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word = u''.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 == u',': |
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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 u',' in buffer: |
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saw_loose_comma = True |
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to_be_split.append(u''.join(buffer)) |
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if to_be_split: |
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if saw_loose_comma: |
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delimiter = u',' |
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else: |
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delimiter = u' ' |
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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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|
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def split_strip(input, delimiter=u','): |
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""" |
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Splits ``input`` on ``delimiter``, stripping each resulting string |
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and returning a list of non-empty strings. |
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""" |
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if not input: |
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return [] |
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|
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words = [w.strip() for w in input.split(delimiter)] |
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return [w for w in words if w] |
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98 |
|
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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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|
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Tag names which contain commas will be double quoted. |
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|
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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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""" |
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112 |
names = [] |
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use_commas = False |
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114 |
for tag in tags: |
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name = tag.name |
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if u',' in name: |
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names.append('"%s"' % name) |
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118 |
continue |
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elif u' ' in name: |
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120 |
if not use_commas: |
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use_commas = True |
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names.append(name) |
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123 |
if use_commas: |
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124 |
glue = u', ' |
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125 |
else: |
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126 |
glue = u' ' |
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return glue.join(names) |
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128 |
|
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129 |
def get_queryset_and_model(queryset_or_model): |
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130 |
""" |
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131 |
Given a ``QuerySet`` or a ``Model``, returns a two-tuple of |
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132 |
(queryset, model). |
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133 |
|
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134 |
If a ``Model`` is given, the ``QuerySet`` returned will be created |
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135 |
using its default manager. |
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136 |
""" |
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137 |
try: |
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138 |
return queryset_or_model, queryset_or_model.model |
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139 |
except AttributeError: |
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140 |
return queryset_or_model._default_manager.all(), queryset_or_model |
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141 |
|
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142 |
def get_tag_list(tags): |
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143 |
""" |
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144 |
Utility function for accepting tag input in a flexible manner. |
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145 |
|
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146 |
If a ``Tag`` object is given, it will be returned in a list as |
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147 |
its single occupant. |
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148 |
|
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149 |
If given, the tag names in the following will be used to create a |
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150 |
``Tag`` ``QuerySet``: |
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151 |
|
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152 |
* A string, which may contain multiple tag names. |
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153 |
* A list or tuple of strings corresponding to tag names. |
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154 |
* A list or tuple of integers corresponding to tag ids. |
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155 |
|
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156 |
If given, the following will be returned as-is: |
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157 |
|
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158 |
* A list or tuple of ``Tag`` objects. |
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159 |
* A ``Tag`` ``QuerySet``. |
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160 |
|
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161 |
""" |
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162 |
from tagging.models import Tag |
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163 |
if isinstance(tags, Tag): |
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164 |
return [tags] |
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165 |
elif isinstance(tags, QuerySet) and tags.model is Tag: |
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166 |
return tags |
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167 |
elif isinstance(tags, types.StringTypes): |
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168 |
return Tag.objects.filter(name__in=parse_tag_input(tags)) |
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169 |
elif isinstance(tags, (types.ListType, types.TupleType)): |
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170 |
if len(tags) == 0: |
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171 |
return tags |
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172 |
contents = set() |
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173 |
for item in tags: |
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174 |
if isinstance(item, types.StringTypes): |
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175 |
contents.add('string') |
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176 |
elif isinstance(item, Tag): |
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177 |
contents.add('tag') |
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178 |
elif isinstance(item, (types.IntType, types.LongType)): |
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179 |
contents.add('int') |
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180 |
if len(contents) == 1: |
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181 |
if 'string' in contents: |
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182 |
return Tag.objects.filter(name__in=[force_unicode(tag) \ |
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183 |
for tag in tags]) |
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184 |
elif 'tag' in contents: |
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185 |
return tags |
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186 |
elif 'int' in contents: |
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187 |
return Tag.objects.filter(id__in=tags) |
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188 |
else: |
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189 |
raise ValueError(_('If a list or tuple of tags is provided, they must all be tag names, Tag objects or Tag ids.')) |
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190 |
else: |
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191 |
raise ValueError(_('The tag input given was invalid.')) |
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192 |
|
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193 |
def get_tag(tag): |
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194 |
""" |
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195 |
Utility function for accepting single tag input in a flexible |
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196 |
manner. |
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197 |
|
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198 |
If a ``Tag`` object is given it will be returned as-is; if a |
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199 |
string or integer are given, they will be used to lookup the |
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200 |
appropriate ``Tag``. |
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201 |
|
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202 |
If no matching tag can be found, ``None`` will be returned. |
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203 |
""" |
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204 |
from tagging.models import Tag |
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205 |
if isinstance(tag, Tag): |
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206 |
return tag |
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207 |
|
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208 |
try: |
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209 |
if isinstance(tag, types.StringTypes): |
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210 |
return Tag.objects.get(name=tag) |
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211 |
elif isinstance(tag, (types.IntType, types.LongType)): |
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212 |
return Tag.objects.get(id=tag) |
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213 |
except Tag.DoesNotExist: |
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214 |
pass |
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215 |
|
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216 |
return None |
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217 |
|
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218 |
# Font size distribution algorithms |
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219 |
LOGARITHMIC, LINEAR = 1, 2 |
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220 |
|
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221 |
def _calculate_thresholds(min_weight, max_weight, steps): |
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222 |
delta = (max_weight - min_weight) / float(steps) |
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223 |
return [min_weight + i * delta for i in range(1, steps + 1)] |
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224 |
|
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225 |
def _calculate_tag_weight(weight, max_weight, distribution): |
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226 |
""" |
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227 |
Logarithmic tag weight calculation is based on code from the |
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228 |
`Tag Cloud`_ plugin for Mephisto, by Sven Fuchs. |
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229 |
|
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230 |
.. _`Tag Cloud`: http://www.artweb-design.de/projects/mephisto-plugin-tag-cloud |
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231 |
""" |
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232 |
if distribution == LINEAR or max_weight == 1: |
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233 |
return weight |
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234 |
elif distribution == LOGARITHMIC: |
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235 |
return math.log(weight) * max_weight / math.log(max_weight) |
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236 |
raise ValueError(_('Invalid distribution algorithm specified: %s.') % distribution) |
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237 |
|
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238 |
def calculate_cloud(tags, steps=4, distribution=LOGARITHMIC): |
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239 |
""" |
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Add a ``font_size`` attribute to each tag according to the |
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frequency of its use, as indicated by its ``count`` |
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attribute. |
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|
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``steps`` defines the range of font sizes - ``font_size`` will |
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be an integer between 1 and ``steps`` (inclusive). |
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|
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``distribution`` defines the type of font size distribution |
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algorithm which will be used - logarithmic or linear. It must be |
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one of ``tagging.utils.LOGARITHMIC`` or ``tagging.utils.LINEAR``. |
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""" |
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if len(tags) > 0: |
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counts = [tag.count for tag in tags] |
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min_weight = float(min(counts)) |
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max_weight = float(max(counts)) |
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thresholds = _calculate_thresholds(min_weight, max_weight, steps) |
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for tag in tags: |
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font_set = False |
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tag_weight = _calculate_tag_weight(tag.count, max_weight, distribution) |
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for i in range(steps): |
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if not font_set and tag_weight <= thresholds[i]: |
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tag.font_size = i + 1 |
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font_set = True |
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return tags |