mirror of
https://github.com/Mikaela/Limnoria.git
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659 lines
20 KiB
Python
Executable File
659 lines
20 KiB
Python
Executable File
#!/usr/bin/env python
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###
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# Copyright (c) 2002, Jeremiah Fincher
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are met:
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#
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# * Redistributions of source code must retain the above copyright notice,
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# this list of conditions, and the following disclaimer.
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# * Redistributions in binary form must reproduce the above copyright notice,
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# this list of conditions, and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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# * Neither the name of the author of this software nor the name of
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# contributors to this software may be used to endorse or promote products
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# derived from this software without specific prior written consent.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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###
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"""
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Simple utility functions.
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"""
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__revision__ = "$Id$"
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import fix
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import os
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import re
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import md5
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import new
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import sha
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import types
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import socket
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import string
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import sgmllib
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import compiler
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import textwrap
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import UserDict
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import htmlentitydefs
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from itertools import imap, ifilter
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from structures import TwoWayDictionary
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curry = new.instancemethod
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def normalizeWhitespace(s):
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"""Normalizes the whitespace in a string; \s+ becomes one space."""
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return ' '.join(s.split())
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class HtmlToText(sgmllib.SGMLParser):
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"""Taken from some eff-bot code on c.l.p."""
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entitydefs = htmlentitydefs.entitydefs.copy()
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entitydefs['nbsp'] = ' '
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def __init__(self, tagReplace=' '):
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self.data = []
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self.tagReplace = tagReplace
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sgmllib.SGMLParser.__init__(self)
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def unknown_starttag(self, tag, attr):
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self.data.append(self.tagReplace)
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def unknown_endtag(self, tag):
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self.data.append(self.tagReplace)
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def handle_data(self, data):
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self.data.append(data)
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def getText(self):
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text = ''.join(self.data).strip()
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return normalizeWhitespace(text)
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def htmlToText(s, tagReplace=' '):
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"""Turns HTML into text. tagReplace is a string to replace HTML tags with.
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"""
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x = HtmlToText(tagReplace)
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x.feed(s)
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return x.getText()
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def eachSubstring(s):
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"""Returns every substring starting at the first index until the last."""
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for i in xrange(1, len(s)+1):
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yield s[:i]
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def abbrev(strings, d=None):
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"""Returns a dictionary mapping unambiguous abbreviations to full forms."""
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if d is None:
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d = {}
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for s in strings:
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for abbreviation in eachSubstring(s):
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if abbreviation not in d:
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d[abbreviation] = s
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else:
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if abbreviation not in strings:
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d[abbreviation] = None
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removals = []
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for key in d:
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if d[key] is None:
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removals.append(key)
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for key in removals:
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del d[key]
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return d
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def timeElapsed(elapsed, leadingZeroes=False, years=True, weeks=True,
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days=True, hours=True, minutes=True, seconds=True):
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"""Given <elapsed> seconds, returns a string with an English description of
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how much time as passed. leadingZeroes determines whether 0 days, 0 hours,
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etc. will be printed; the others determine what larger time periods should
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be used.
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"""
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elapsed = int(elapsed)
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assert years or weeks or days or \
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hours or minutes or seconds, 'One flag must be True'
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ret = []
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if years:
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yrs, elapsed = elapsed // 31536000, elapsed % 31536000
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if leadingZeroes or yrs:
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if yrs:
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leadingZeroes = True
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ret.append(nItems('year', yrs))
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if weeks:
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wks, elapsed = elapsed // 604800, elapsed % 604800
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if leadingZeroes or wks:
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if wks:
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leadingZeroes = True
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ret.append(nItems('week', wks))
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if days:
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ds, elapsed = elapsed // 86400, elapsed % 86400
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if leadingZeroes or ds:
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if ds:
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leadingZeroes = True
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ret.append(nItems('day', ds))
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if hours:
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hrs, elapsed = elapsed // 3600, elapsed % 3600
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if leadingZeroes or hrs:
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if hrs:
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leadingZeroes = True
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ret.append(nItems('hour', hrs))
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if minutes or seconds:
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mins, secs = elapsed // 60, elapsed % 60
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if leadingZeroes or mins:
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ret.append(nItems('minute', mins))
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if seconds:
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ret.append(nItems('second', secs))
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if len(ret) == 0:
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raise ValueError, 'Time difference not great enough to be noted.'
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if len(ret) == 1:
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return ret[0]
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else:
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return commaAndify(ret)
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def distance(s, t):
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"""Returns the levenshtein edit distance between two strings."""
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n = len(s)
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m = len(t)
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if n == 0:
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return m
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elif m == 0:
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return n
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d = []
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for i in range(n+1):
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d.append([])
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for j in range(m+1):
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d[i].append(0)
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d[0][j] = j
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d[i][0] = i
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for i in range(1, n+1):
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cs = s[i-1]
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for j in range(1, m+1):
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ct = t[j-1]
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cost = int(cs != ct)
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d[i][j] = min(d[i-1][j]+1, d[i][j-1]+1, d[i-1][j-1]+cost)
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return d[n][m]
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_soundextrans = string.maketrans(string.ascii_uppercase,
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'01230120022455012623010202')
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_notUpper = string.ascii.translate(string.ascii, string.ascii_uppercase)
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def soundex(s, length=4):
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"""Returns the soundex hash of a given string."""
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s = s.upper() # Make everything uppercase.
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s = s.translate(string.ascii, _notUpper) # Delete non-letters.
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if not s:
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raise ValueError, 'Invalid string for soundex: %s'
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firstChar = s[0] # Save the first character.
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s = s.translate(_soundextrans) # Convert to soundex numbers.
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s = s.lstrip(s[0]) # Remove all repeated first characters.
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L = [firstChar]
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for c in s:
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if c != L[-1]:
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L.append(c)
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L = [c for c in L if c != '0'] + (['0']*(length-1))
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s = ''.join(L)
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return length and s[:length] or s.rstrip('0')
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def dqrepr(s):
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"""Returns a repr() of s guaranteed to be in double quotes."""
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# The wankers-that-be decided not to use double-quotes anymore in 2.3.
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# return '"' + repr("'\x00" + s)[6:]
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return '"%s"' % s.encode('string_escape').replace('"', '\\"')
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nonEscapedSlashes = re.compile(r'(?<!\\)/')
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def perlReToPythonRe(s):
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"""Converts a string representation of a Perl regular expression (i.e.,
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m/^foo$/i or /foo|bar/) to a Python regular expression.
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"""
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try:
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(kind, regexp, flags) = nonEscapedSlashes.split(s)
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except ValueError: # Unpack list of wrong size.
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raise ValueError, 'Must be of the form m/.../ or /.../'
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regexp = regexp.replace('\\/', '/')
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if kind not in ('', 'm'):
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raise ValueError, 'Invalid kind: must be in ("", "m")'
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flag = 0
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try:
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for c in flags.upper():
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flag |= getattr(re, c)
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except AttributeError:
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raise ValueError, 'Invalid flag: %s' % c
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try:
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return re.compile(regexp, flag)
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except re.error, e:
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raise ValueError, str(e)
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def perlReToReplacer(s):
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"""Converts a string representation of a Perl regular expression (i.e.,
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s/foo/bar/g or s/foo/bar/i) to a Python function doing the equivalent
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replacement.
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"""
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try:
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(kind, regexp, replace, flags) = nonEscapedSlashes.split(s)
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except ValueError: # Unpack list of wrong size.
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raise ValueError, 'Must be of the form s/.../.../'
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regexp = regexp.replace('\x08', r'\b')
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replace = replace.replace('\\/', '/')
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for i in xrange(10):
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replace = replace.replace(chr(i), r'\%s' % i)
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if kind != 's':
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raise ValueError, 'Invalid kind: must be "s"'
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g = False
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if 'g' in flags:
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g = True
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flags = filter('g'.__ne__, flags)
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r = perlReToPythonRe('/'.join(('', regexp, flags)))
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if g:
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return curry(r.sub, replace)
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else:
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return lambda s: r.sub(replace, s, 1)
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def findBinaryInPath(s):
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"""Return full path of a binary if it's in PATH, otherwise return None."""
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cmdLine = None
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for dir in os.getenv('PATH').split(':'):
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filename = os.path.join(dir, s)
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if os.path.exists(filename):
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cmdLine = filename
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break
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return cmdLine
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def commaAndify(seq, comma=',', And='and'):
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"""Given a a sequence, returns an english clause for that sequence.
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I.e., given [1, 2, 3], returns '1, 2, and 3'
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"""
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L = list(seq)
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if len(L) == 0:
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return ''
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elif len(L) == 1:
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return ''.join(L) # We need this because it raises TypeError.
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elif len(L) == 2:
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L.insert(1, And)
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return ' '.join(L)
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else:
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L[-1] = '%s %s' % (And, L[-1])
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sep = '%s ' % comma
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return sep.join(L)
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_unCommaTheRe = re.compile(r'(.*),\s*(the)$', re.I)
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def unCommaThe(s):
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"""Takes a string of the form 'foo, the' and turns it into 'the foo'."""
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m = _unCommaTheRe.match(s)
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if m is not None:
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return '%s %s' % (m.group(2), m.group(1))
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else:
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return s
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def wrapLines(s):
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"""Word wraps several paragraphs in a string s."""
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L = []
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for line in s.splitlines():
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L.append(textwrap.fill(line))
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return '\n'.join(L)
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def ellipsisify(s, n):
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"""Returns a shortened version of s. Produces up to the first n chars at
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the nearest word boundary.
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"""
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if len(s) <= n:
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return s
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else:
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return (textwrap.wrap(s, n-3)[0] + '...')
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plurals = TwoWayDictionary({})
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def matchCase(s1, s2):
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"""Matches the case of s1 in s2"""
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if s1.isupper():
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return s2.upper()
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else:
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L = list(s2)
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for (i, char) in enumerate(s1[:len(s2)]):
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if char.isupper():
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L[i] = L[i].upper()
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return ''.join(L)
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consonants = 'bcdfghjklmnpqrstvwxz'
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_pluralizeRegex = re.compile('[%s]y$' % consonants)
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def pluralize(s, i=2):
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"""Returns the plural of s based on its number i. Put any exceptions to
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the general English rule of appending 's' in the plurals dictionary.
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"""
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if i == 1:
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return s
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else:
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lowered = s.lower()
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# Exception dictionary
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if lowered in plurals:
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return matchCase(s, plurals[lowered])
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# Words ending with 'ch', 'sh' or 'ss' such as 'punch(es)', 'fish(es)
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# and miss(es)
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elif any(lowered.endswith, ['ch', 'sh', 'ss']):
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return matchCase(s, s+'es')
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# Words ending with a consonant followed by a 'y' such as
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# 'try (tries)' or 'spy (spies)'
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elif re.search(_pluralizeRegex, lowered):
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return matchCase(s, s[:-1] + 'ies')
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# In all other cases, we simply add an 's' to the base word
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else:
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return matchCase(s, s+'s')
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_depluralizeRegex = re.compile('[%s]ies' % consonants)
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def depluralize(s):
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"""Returns the singular of s."""
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lowered = s.lower()
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if lowered in plurals:
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return matchCase(s, plurals[lowered])
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elif any(lowered.endswith, ['ches', 'shes', 'sses']):
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return s[:-2]
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elif re.search(_depluralizeRegex, lowered):
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return s[:-3] + 'y'
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else:
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if lowered.endswith('s'):
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return s[:-1] # Chop off 's'.
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else:
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return s # Don't know what to do.
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def nItems(item, n, between=None):
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"""Works like this:
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>>> nItems('clock', 1)
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'1 clock'
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>>> nItems('clock', 10)
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'10 clocks'
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>>> nItems('clock', 10, between='grandfather')
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'10 grandfather clocks'
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"""
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if between is None:
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return '%s %s' % (n, pluralize(item, n))
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else:
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return '%s %s %s' % (n, between, pluralize(item, n))
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def be(i):
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"""Returns the form of the verb 'to be' based on the number i."""
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if i == 1:
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return 'is'
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else:
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return 'are'
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def sortBy(f, L):
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"""Uses the decorate-sort-undecorate pattern to sort L by function f."""
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for (i, elt) in enumerate(L):
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L[i] = (f(elt), i, elt)
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L.sort()
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for (i, elt) in enumerate(L):
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L[i] = L[i][2]
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def sorted(iterable, cmp=None, key=None, reversed=False):
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L = list(iterable)
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if key is not None:
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sortBy(key, L, cmp=cmp)
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else:
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L.sort(cmp)
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if reversed:
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L.reverse()
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return L
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__builtins__['sorted'] = sorted
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def mktemp(suffix=''):
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"""Gives a decent random string, suitable for a filename."""
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import sha
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import md5
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import time
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import random
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r = random.Random()
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m = md5.md5(suffix)
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r.seed(time.time())
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s = str(r.getstate())
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for x in xrange(0, random.randrange(400), random.randrange(1, 5)):
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m.update(str(x))
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m.update(s)
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m.update(str(time.time()))
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s = m.hexdigest()
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return sha.sha(s + str(time.time())).hexdigest() + suffix
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def itersplit(isSeparator, iterable, maxsplit=-1, yieldEmpty=False):
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"""Splits an iterator based on a predicate isSeparator."""
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acc = []
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for element in iterable:
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if maxsplit == 0 or not isSeparator(element):
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acc.append(element)
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else:
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maxsplit -= 1
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if acc or yieldEmpty:
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yield acc
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acc = []
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if acc or yieldEmpty:
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yield acc
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def flatten(seq, strings=False):
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"""Flattens a list of lists into a single list. See the test for examples.
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"""
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for elt in seq:
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if not strings and type(elt) == str or type(elt) == unicode:
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yield elt
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else:
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try:
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for x in flatten(elt):
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yield x
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except TypeError:
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yield elt
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def saltHash(password, salt=None, hash='sha'):
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if salt is None:
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salt = mktemp()[:8]
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if hash == 'sha':
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hasher = sha.sha
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elif hash == 'md5':
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hasher = md5.md5
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return '|'.join([salt, hasher(salt + password).hexdigest()])
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def safeEval(s, namespace={'True': True, 'False': False, 'None': None}):
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"""Evaluates s, safely. Useful for turning strings into tuples/lists/etc.
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without unsafely using eval()."""
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node = compiler.parse(s)
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nodes = compiler.parse(s).node.nodes
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if not nodes:
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if node.__class__ is compiler.ast.Module:
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return node.doc
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else:
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raise ValueError, 'Unsafe string.'
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node = nodes[0]
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if node.__class__ is not compiler.ast.Discard:
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raise ValueError, 'Invalid expression: %s'
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node = node.getChildNodes()[0]
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def checkNode(node):
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if node.__class__ is compiler.ast.Const:
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return True
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if node.__class__ in (compiler.ast.List,
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compiler.ast.Tuple,
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compiler.ast.Dict):
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return all(checkNode, node.getChildNodes())
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if node.__class__ is compiler.ast.Name:
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if node.name in namespace:
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return True
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else:
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return False
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else:
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return False
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if checkNode(node):
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return eval(s, namespace, namespace)
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else:
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raise ValueError, 'Unsafe string.'
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def exnToString(e):
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"""Turns a simple exception instance into a string (better than str(e))"""
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return '%s: %s' % (e.__class__.__name__, e)
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class IterableMap(object):
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"""Define .iteritems() in a class and subclass this to get the other iters.
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"""
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def iteritems(self):
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raise NotImplementedError
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def iterkeys(self):
|
|
for (key, _) in self.iteritems():
|
|
yield key
|
|
__iter__ = iterkeys
|
|
|
|
def itervalues(self):
|
|
for (_, value) in self.iteritems():
|
|
yield value
|
|
|
|
def items(self):
|
|
return list(self.iteritems())
|
|
|
|
def keys(self):
|
|
return list(self.iterkeys())
|
|
|
|
def values(self):
|
|
return list(self.itervalues())
|
|
|
|
def __len__(self):
|
|
ret = 0
|
|
for _ in self.iteritems():
|
|
ret += 1
|
|
return ret
|
|
|
|
def __nonzero__(self):
|
|
for _ in self.iteritems():
|
|
return True
|
|
return False
|
|
|
|
|
|
def nonCommentLines(fd):
|
|
for line in fd:
|
|
if not line.startswith('#'):
|
|
yield line
|
|
|
|
def nonEmptyLines(fd):
|
|
## for line in fd:
|
|
## if line.strip():
|
|
## yield line
|
|
return ifilter(str.strip, fd)
|
|
|
|
def nonCommentNonEmptyLines(fd):
|
|
return nonEmptyLines(nonCommentLines(fd))
|
|
|
|
def changeFunctionName(f, name, doc=None):
|
|
if doc is None:
|
|
doc = f.__doc__
|
|
newf = types.FunctionType(f.func_code, f.func_globals, name,
|
|
f.func_defaults, f.func_closure)
|
|
newf.__doc__ = doc
|
|
return newf
|
|
|
|
def getSocket(host):
|
|
"""Returns a socket of the correct AF_INET type (v4 or v6) in order to
|
|
communicate with host.
|
|
"""
|
|
try:
|
|
host = socket.gethostbyname(host)
|
|
except socket.error:
|
|
raise
|
|
if isIP(host):
|
|
return socket.socket(socket.AF_INET, socket.SOCK_STREAM)
|
|
elif isIPV6(host):
|
|
return socket.socket(socket.AF_INET6, socket.SOCK_STREAM)
|
|
else:
|
|
raise socket.error, 'Something wonky happened.'
|
|
|
|
_ipchars = string.digits + '.'
|
|
def isIP(s):
|
|
"""Returns whether or not a given string is an IPV4 address.
|
|
|
|
>>> isIP('255.255.255.255')
|
|
1
|
|
|
|
>>> isIP('abc.abc.abc.abc')
|
|
0
|
|
"""
|
|
try:
|
|
return bool(socket.inet_aton(s))
|
|
except socket.error:
|
|
return False
|
|
|
|
def isIPV6(s):
|
|
"""Returns whether or not a given string is an IPV6 address."""
|
|
try:
|
|
return bool(socket.inet_pton(socket.AF_INET6, s))
|
|
except socket.error:
|
|
try:
|
|
socket.inet_pton(socket.AF_INET6, '::')
|
|
except socket.error:
|
|
# We gotta fake it.
|
|
if s.count('::') <= 1:
|
|
L = s.split(':')
|
|
if len(L) <= 8:
|
|
for x in L:
|
|
if x:
|
|
try:
|
|
int(x, 16)
|
|
except ValueError:
|
|
return False
|
|
return True
|
|
return False
|
|
|
|
class InsensitivePreservingDict(UserDict.DictMixin, object):
|
|
key = staticmethod(str.lower)
|
|
def __init__(self, dict=None, key=None):
|
|
if key is not None:
|
|
self.key = key
|
|
self.data = {}
|
|
if dict is not None:
|
|
self.update(dict)
|
|
|
|
def fromkeys(cls, keys, s=None, dict=None, key=None):
|
|
d = cls(dict=dict, key=key)
|
|
for key in keys:
|
|
d[key] = s
|
|
return d
|
|
fromkeys = classmethod(fromkeys)
|
|
|
|
def __getitem__(self, k):
|
|
return self.data[self.key(k)][1]
|
|
|
|
def __setitem__(self, k, v):
|
|
self.data[self.key(k)] = (k, v)
|
|
|
|
def __delitem__(self, k):
|
|
del self.data[self.key(k)]
|
|
|
|
def iteritems(self):
|
|
return self.data.itervalues()
|
|
|
|
def keys(self):
|
|
L = []
|
|
for (k, _) in self.iteritems():
|
|
L.append(k)
|
|
return L
|
|
|
|
def __reduce__(self):
|
|
return (self.__class__, (dict(self.data.values()),))
|
|
|
|
def mungeEmailForWeb(s):
|
|
s = s.replace('@', ' AT ')
|
|
s = s.replace('.', ' DOT ')
|
|
return s
|
|
|
|
|
|
if __name__ == '__main__':
|
|
import sys, doctest
|
|
doctest.testmod(sys.modules['__main__'])
|
|
|
|
|
|
# vim:set shiftwidth=4 tabstop=8 expandtab textwidth=78:
|