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import re
from django.conf import settings
# Capitalizes the first letter of a string.
capfirst = lambda x: x and x[0].upper() + x[1:]
def wrap(text, width):
"""
A word-wrap function that preserves existing line breaks and most spaces in
the text. Expects that existing line breaks are posix newlines (\n).
See http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/148061
"""
return reduce(lambda line, word, width=width: '%s%s%s' %
(line,
' \n'[(len(line[line.rfind('\n')+1:])
+ len(word.split('\n',1)[0]
) >= width)],
word),
text.split(' ')
)
def truncate_words(s, num):
"Truncates a string after a certain number of words."
length = int(num)
words = s.split()
if len(words) > length:
words = words[:length]
if not words[-1].endswith('...'):
words.append('...')
return ' '.join(words)
def get_valid_filename(s):
"""
Returns the given string converted to a string that can be used for a clean
filename. Specifically, leading and trailing spaces are removed; other
spaces are converted to underscores; and all non-filename-safe characters
are removed.
>>> get_valid_filename("john's portrait in 2004.jpg")
'johns_portrait_in_2004.jpg'
"""
s = s.strip().replace(' ', '_')
return re.sub(r'[^-A-Za-z0-9_.]', '', s)
def get_text_list(list_, last_word='or'):
"""
>>> get_text_list(['a', 'b', 'c', 'd'])
'a, b, c or d'
>>> get_text_list(['a', 'b', 'c'], 'and')
'a, b and c'
>>> get_text_list(['a', 'b'], 'and')
'a and b'
>>> get_text_list(['a'])
'a'
>>> get_text_list([])
''
"""
if len(list_) == 0: return ''
if len(list_) == 1: return list_[0]
return '%s %s %s' % (', '.join([str(i) for i in list_][:-1]), last_word, list_[-1])
def normalize_newlines(text):
return re.sub(r'\r\n|\r|\n', '\n', text)
def recapitalize(text):
"Recapitalizes text, placing caps after end-of-sentence punctuation."
# capwords = ()
text = text.lower()
capsRE = re.compile(r'(?:^|(?<=[\.\?\!] ))([a-z])')
text = capsRE.sub(lambda x: x.group(1).upper(), text)
# for capword in capwords:
# capwordRE = re.compile(r'\b%s\b' % capword, re.I)
# text = capwordRE.sub(capword, text)
return text
def phone2numeric(phone):
"Converts a phone number with letters into its numeric equivalent."
letters = re.compile(r'[A-PR-Y]', re.I)
char2number = lambda m: {'a': '2', 'c': '2', 'b': '2', 'e': '3',
'd': '3', 'g': '4', 'f': '3', 'i': '4', 'h': '4', 'k': '5',
'j': '5', 'm': '6', 'l': '5', 'o': '6', 'n': '6', 'p': '7',
's': '7', 'r': '7', 'u': '8', 't': '8', 'w': '9', 'v': '8',
'y': '9', 'x': '9'}.get(m.group(0).lower())
return letters.sub(char2number, phone)
# From http://www.xhaus.com/alan/python/httpcomp.html#gzip
# Used with permission.
def compress_string(s):
import cStringIO, gzip
zbuf = cStringIO.StringIO()
zfile = gzip.GzipFile(mode='wb', compresslevel=6, fileobj=zbuf)
zfile.write(s)
zfile.close()
return zbuf.getvalue()
ustring_re = re.compile(u"([\u0080-\uffff])")
def javascript_quote(s):
def fix(match):
return r"\u%04x" % ord(match.group(1))
if type(s) == str:
s = s.decode(settings.DEFAULT_CHARSET)
elif type(s) != unicode:
raise TypeError, s
s = s.replace('\\', '\\\\')
s = s.replace('\n', '\\n')
s = s.replace('\t', '\\t')
s = s.replace("'", "\\'")
return str(ustring_re.sub(fix, s))
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