author | Todd Larsen <tlarsen@google.com> |
Wed, 01 Oct 2008 06:03:53 +0000 | |
changeset 236 | d5302883f3ac |
parent 54 | 03e267d67478 |
child 323 | ff1a9aa48cfd |
permissions | -rw-r--r-- |
54
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import re |
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from django.conf import settings |
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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 |
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|
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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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|
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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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the text. Expects that existing line breaks are posix newlines. |
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""" |
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text = force_unicode(text) |
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def _generator(): |
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it = iter(text.split(' ')) |
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word = it.next() |
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yield word |
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pos = len(word) - word.rfind('\n') - 1 |
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for word in it: |
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if "\n" in word: |
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lines = word.split('\n') |
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else: |
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lines = (word,) |
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pos += len(lines[0]) + 1 |
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if pos > width: |
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yield '\n' |
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pos = len(lines[-1]) |
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else: |
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yield ' ' |
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if len(lines) > 1: |
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pos = len(lines[-1]) |
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yield word |
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return u''.join(_generator()) |
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wrap = allow_lazy(wrap, unicode) |
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|
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def truncate_words(s, num): |
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"Truncates a string after a certain number of words." |
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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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if len(words) > length: |
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words = words[:length] |
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if not words[-1].endswith('...'): |
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words.append('...') |
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return u' '.join(words) |
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truncate_words = allow_lazy(truncate_words, unicode) |
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|
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def truncate_html_words(s, num): |
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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 given |
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html. |
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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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# Count non-HTML words and keep note of open tags |
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pos = 0 |
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ellipsis_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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if not m: |
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# Checked through whole string |
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break |
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pos = m.end(0) |
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if m.group(1): |
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# It's an actual non-HTML word |
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words += 1 |
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if words == length: |
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ellipsis_pos = pos |
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continue |
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# Check for tag |
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tag = re_tag.match(m.group(0)) |
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if not tag or ellipsis_pos: |
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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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if self_closing or tagname in html4_singlets: |
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pass |
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elif closing_tag: |
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# Check for match in open tags list |
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try: |
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i = open_tags.index(tagname) |
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95 |
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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99 |
open_tags = open_tags[i+1:] |
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100 |
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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105 |
return s |
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out = s[:ellipsis_pos] + ' ...' |
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107 |
# Close any tags still open |
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108 |
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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truncate_html_words = allow_lazy(truncate_html_words, unicode) |
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113 |
|
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114 |
def get_valid_filename(s): |
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""" |
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116 |
Returns the given string converted to a string that can be used for a clean |
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117 |
filename. Specifically, leading and trailing spaces are removed; other |
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spaces are converted to underscores; and all non-filename-safe characters |
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119 |
are removed. |
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120 |
>>> get_valid_filename("john's portrait in 2004.jpg") |
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121 |
'johns_portrait_in_2004.jpg' |
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122 |
""" |
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s = force_unicode(s).strip().replace(' ', '_') |
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return re.sub(r'[^-A-Za-z0-9_.]', '', s) |
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125 |
get_valid_filename = allow_lazy(get_valid_filename, unicode) |
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126 |
|
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def get_text_list(list_, last_word=ugettext_lazy(u'or')): |
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128 |
""" |
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129 |
>>> get_text_list(['a', 'b', 'c', 'd']) |
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'a, b, c or d' |
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131 |
>>> get_text_list(['a', 'b', 'c'], 'and') |
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'a, b and c' |
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133 |
>>> get_text_list(['a', 'b'], 'and') |
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134 |
'a and b' |
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135 |
>>> get_text_list(['a']) |
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'a' |
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137 |
>>> get_text_list([]) |
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138 |
'' |
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139 |
""" |
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140 |
if len(list_) == 0: return u'' |
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141 |
if len(list_) == 1: return force_unicode(list_[0]) |
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return u'%s %s %s' % (', '.join([force_unicode(i) for i in list_][:-1]), force_unicode(last_word), force_unicode(list_[-1])) |
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143 |
get_text_list = allow_lazy(get_text_list, unicode) |
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144 |
|
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145 |
def normalize_newlines(text): |
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146 |
return force_unicode(re.sub(r'\r\n|\r|\n', '\n', text)) |
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normalize_newlines = allow_lazy(normalize_newlines, unicode) |
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148 |
|
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149 |
def recapitalize(text): |
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150 |
"Recapitalizes text, placing caps after end-of-sentence punctuation." |
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151 |
text = force_unicode(text).lower() |
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capsRE = re.compile(r'(?:^|(?<=[\.\?\!] ))([a-z])') |
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text = capsRE.sub(lambda x: x.group(1).upper(), text) |
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154 |
return text |
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recapitalize = allow_lazy(recapitalize) |
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156 |
|
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157 |
def phone2numeric(phone): |
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158 |
"Converts a phone number with letters into its numeric equivalent." |
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159 |
letters = re.compile(r'[A-PR-Y]', re.I) |
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char2number = lambda m: {'a': '2', 'c': '2', 'b': '2', 'e': '3', |
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161 |
'd': '3', 'g': '4', 'f': '3', 'i': '4', 'h': '4', 'k': '5', |
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162 |
'j': '5', 'm': '6', 'l': '5', 'o': '6', 'n': '6', 'p': '7', |
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163 |
's': '7', 'r': '7', 'u': '8', 't': '8', 'w': '9', 'v': '8', |
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164 |
'y': '9', 'x': '9'}.get(m.group(0).lower()) |
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return letters.sub(char2number, phone) |
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166 |
phone2numeric = allow_lazy(phone2numeric) |
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167 |
|
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168 |
# From http://www.xhaus.com/alan/python/httpcomp.html#gzip |
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169 |
# Used with permission. |
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170 |
def compress_string(s): |
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171 |
import cStringIO, gzip |
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zbuf = cStringIO.StringIO() |
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zfile = gzip.GzipFile(mode='wb', compresslevel=6, fileobj=zbuf) |
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174 |
zfile.write(s) |
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175 |
zfile.close() |
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176 |
return zbuf.getvalue() |
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177 |
|
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178 |
ustring_re = re.compile(u"([\u0080-\uffff])") |
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179 |
|
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180 |
def javascript_quote(s, quote_double_quotes=False): |
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181 |
|
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182 |
def fix(match): |
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183 |
return r"\u%04x" % ord(match.group(1)) |
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184 |
|
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185 |
if type(s) == str: |
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186 |
s = s.decode('utf-8') |
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187 |
elif type(s) != unicode: |
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188 |
raise TypeError, s |
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189 |
s = s.replace('\\', '\\\\') |
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190 |
s = s.replace('\r', '\\r') |
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191 |
s = s.replace('\n', '\\n') |
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192 |
s = s.replace('\t', '\\t') |
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193 |
s = s.replace("'", "\\'") |
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194 |
if quote_double_quotes: |
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195 |
s = s.replace('"', '"') |
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196 |
return str(ustring_re.sub(fix, s)) |
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197 |
javascript_quote = allow_lazy(javascript_quote, unicode) |
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198 |
|
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199 |
smart_split_re = re.compile('("(?:[^"\\\\]*(?:\\\\.[^"\\\\]*)*)"|\'(?:[^\'\\\\]*(?:\\\\.[^\'\\\\]*)*)\'|[^\\s]+)') |
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200 |
def smart_split(text): |
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201 |
""" |
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202 |
Generator that splits a string by spaces, leaving quoted phrases together. |
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203 |
Supports both single and double quotes, and supports escaping quotes with |
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204 |
backslashes. In the output, strings will keep their initial and trailing |
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205 |
quote marks. |
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206 |
|
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207 |
>>> list(smart_split('This is "a person\'s" test.')) |
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208 |
['This', 'is', '"a person\'s"', 'test.'] |
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209 |
""" |
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210 |
text = force_unicode(text) |
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211 |
for bit in smart_split_re.finditer(text): |
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212 |
bit = bit.group(0) |
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213 |
if bit[0] == '"' and bit[-1] == '"': |
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214 |
yield '"' + bit[1:-1].replace('\\"', '"').replace('\\\\', '\\') + '"' |
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215 |
elif bit[0] == "'" and bit[-1] == "'": |
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216 |
yield "'" + bit[1:-1].replace("\\'", "'").replace("\\\\", "\\") + "'" |
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217 |
else: |
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218 |
yield bit |
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219 |
smart_split = allow_lazy(smart_split, unicode) |
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220 |