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# Copyright (c) 2002-2010 Zooko Wilcox-O'Hearn
# This file is part of pyutil; see README.rst for licensing terms.
def commonprefix(l):
cp = []
for i in range(min(map(len, l))):
c = l[0][i]
for s in l[1:]:
if s[i] != c:
return ''.join(cp)
cp.append(c)
return ''.join(cp)
def commonsuffix(l):
cp = []
for i in range(min(map(len, l))):
c = l[0][-i-1]
for s in l[1:]:
if s[-i-1] != c:
cp.reverse()
return ''.join(cp)
cp.append(c)
cp.reverse()
return ''.join(cp)
def split_on_newlines(s):
"""
Splits s on all of the three newline sequences: "\r\n", "\r", or "\n".
"""
res = []
for x in s.split('\r\n'):
for y in x.split('\r'):
res.extend(y.split('\n'))
return res
def pop_trailing_newlines(s):
"""
@return a copy of s minus any trailing "\n"'s or "\r"'s
"""
i = len(s)-1
if i < 0:
return ''
while s[i] in ('\n', '\r',):
i = i - 1
if i < 0:
return ''
return s[:i+1]