228 lines
9.4 KiB
Python
Executable File
228 lines
9.4 KiB
Python
Executable File
#!/usr/bin/env python
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## vim:ts=4:et:nowrap
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"""A user-defined wrapper around string objects
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Note: string objects have grown methods in Python 1.6
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This module requires Python 1.6 or later.
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"""
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import sys
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import collections
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__all__ = ["UserString","MutableString"]
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class UserString(collections.Sequence):
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def __init__(self, seq):
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if isinstance(seq, basestring):
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self.data = seq
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elif isinstance(seq, UserString):
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self.data = seq.data[:]
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else:
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self.data = str(seq)
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def __str__(self): return str(self.data)
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def __repr__(self): return repr(self.data)
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def __int__(self): return int(self.data)
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def __long__(self): return long(self.data)
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def __float__(self): return float(self.data)
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def __complex__(self): return complex(self.data)
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def __hash__(self): return hash(self.data)
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def __cmp__(self, string):
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if isinstance(string, UserString):
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return cmp(self.data, string.data)
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else:
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return cmp(self.data, string)
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def __contains__(self, char):
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return char in self.data
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def __len__(self): return len(self.data)
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def __getitem__(self, index): return self.__class__(self.data[index])
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def __getslice__(self, start, end):
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start = max(start, 0); end = max(end, 0)
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return self.__class__(self.data[start:end])
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def __add__(self, other):
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if isinstance(other, UserString):
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return self.__class__(self.data + other.data)
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elif isinstance(other, basestring):
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return self.__class__(self.data + other)
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else:
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return self.__class__(self.data + str(other))
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def __radd__(self, other):
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if isinstance(other, basestring):
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return self.__class__(other + self.data)
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else:
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return self.__class__(str(other) + self.data)
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def __mul__(self, n):
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return self.__class__(self.data*n)
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__rmul__ = __mul__
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def __mod__(self, args):
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return self.__class__(self.data % args)
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# the following methods are defined in alphabetical order:
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def capitalize(self): return self.__class__(self.data.capitalize())
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def center(self, width, *args):
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return self.__class__(self.data.center(width, *args))
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def count(self, sub, start=0, end=sys.maxint):
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return self.data.count(sub, start, end)
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def decode(self, encoding=None, errors=None): # XXX improve this?
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if encoding:
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if errors:
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return self.__class__(self.data.decode(encoding, errors))
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else:
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return self.__class__(self.data.decode(encoding))
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else:
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return self.__class__(self.data.decode())
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def encode(self, encoding=None, errors=None): # XXX improve this?
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if encoding:
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if errors:
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return self.__class__(self.data.encode(encoding, errors))
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else:
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return self.__class__(self.data.encode(encoding))
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else:
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return self.__class__(self.data.encode())
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def endswith(self, suffix, start=0, end=sys.maxint):
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return self.data.endswith(suffix, start, end)
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def expandtabs(self, tabsize=8):
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return self.__class__(self.data.expandtabs(tabsize))
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def find(self, sub, start=0, end=sys.maxint):
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return self.data.find(sub, start, end)
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def index(self, sub, start=0, end=sys.maxint):
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return self.data.index(sub, start, end)
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def isalpha(self): return self.data.isalpha()
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def isalnum(self): return self.data.isalnum()
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def isdecimal(self): return self.data.isdecimal()
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def isdigit(self): return self.data.isdigit()
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def islower(self): return self.data.islower()
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def isnumeric(self): return self.data.isnumeric()
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def isspace(self): return self.data.isspace()
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def istitle(self): return self.data.istitle()
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def isupper(self): return self.data.isupper()
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def join(self, seq): return self.data.join(seq)
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def ljust(self, width, *args):
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return self.__class__(self.data.ljust(width, *args))
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def lower(self): return self.__class__(self.data.lower())
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def lstrip(self, chars=None): return self.__class__(self.data.lstrip(chars))
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def partition(self, sep):
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return self.data.partition(sep)
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def replace(self, old, new, maxsplit=-1):
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return self.__class__(self.data.replace(old, new, maxsplit))
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def rfind(self, sub, start=0, end=sys.maxint):
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return self.data.rfind(sub, start, end)
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def rindex(self, sub, start=0, end=sys.maxint):
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return self.data.rindex(sub, start, end)
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def rjust(self, width, *args):
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return self.__class__(self.data.rjust(width, *args))
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def rpartition(self, sep):
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return self.data.rpartition(sep)
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def rstrip(self, chars=None): return self.__class__(self.data.rstrip(chars))
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def split(self, sep=None, maxsplit=-1):
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return self.data.split(sep, maxsplit)
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def rsplit(self, sep=None, maxsplit=-1):
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return self.data.rsplit(sep, maxsplit)
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def splitlines(self, keepends=0): return self.data.splitlines(keepends)
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def startswith(self, prefix, start=0, end=sys.maxint):
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return self.data.startswith(prefix, start, end)
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def strip(self, chars=None): return self.__class__(self.data.strip(chars))
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def swapcase(self): return self.__class__(self.data.swapcase())
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def title(self): return self.__class__(self.data.title())
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def translate(self, *args):
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return self.__class__(self.data.translate(*args))
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def upper(self): return self.__class__(self.data.upper())
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def zfill(self, width): return self.__class__(self.data.zfill(width))
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collections.Sequence.register(UserString)
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class MutableString(UserString, collections.MutableSequence):
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"""mutable string objects
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Python strings are immutable objects. This has the advantage, that
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strings may be used as dictionary keys. If this property isn't needed
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and you insist on changing string values in place instead, you may cheat
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and use MutableString.
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But the purpose of this class is an educational one: to prevent
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people from inventing their own mutable string class derived
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from UserString and than forget thereby to remove (override) the
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__hash__ method inherited from UserString. This would lead to
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errors that would be very hard to track down.
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A faster and better solution is to rewrite your program using lists."""
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def __init__(self, string=""):
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self.data = string
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def __hash__(self):
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raise TypeError, "unhashable type (it is mutable)"
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def __setitem__(self, index, sub):
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if isinstance(index, slice):
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if isinstance(sub, UserString):
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sub = sub.data
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elif not isinstance(sub, basestring):
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sub = str(sub)
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start, stop, step = index.indices(len(self.data))
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if step == -1:
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start, stop = stop+1, start+1
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sub = sub[::-1]
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elif step != 1:
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# XXX(twouters): I guess we should be reimplementing
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# the extended slice assignment/deletion algorithm here...
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raise TypeError, "invalid step in slicing assignment"
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start = min(start, stop)
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self.data = self.data[:start] + sub + self.data[stop:]
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else:
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if index < 0:
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index += len(self.data)
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if index < 0 or index >= len(self.data): raise IndexError
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self.data = self.data[:index] + sub + self.data[index+1:]
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def __delitem__(self, index):
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if isinstance(index, slice):
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start, stop, step = index.indices(len(self.data))
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if step == -1:
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start, stop = stop+1, start+1
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elif step != 1:
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# XXX(twouters): see same block in __setitem__
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raise TypeError, "invalid step in slicing deletion"
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start = min(start, stop)
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self.data = self.data[:start] + self.data[stop:]
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else:
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if index < 0:
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index += len(self.data)
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if index < 0 or index >= len(self.data): raise IndexError
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self.data = self.data[:index] + self.data[index+1:]
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def __setslice__(self, start, end, sub):
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start = max(start, 0); end = max(end, 0)
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if isinstance(sub, UserString):
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self.data = self.data[:start]+sub.data+self.data[end:]
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elif isinstance(sub, basestring):
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self.data = self.data[:start]+sub+self.data[end:]
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else:
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self.data = self.data[:start]+str(sub)+self.data[end:]
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def __delslice__(self, start, end):
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start = max(start, 0); end = max(end, 0)
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self.data = self.data[:start] + self.data[end:]
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def immutable(self):
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return UserString(self.data)
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def __iadd__(self, other):
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if isinstance(other, UserString):
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self.data += other.data
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elif isinstance(other, basestring):
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self.data += other
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else:
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self.data += str(other)
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return self
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def __imul__(self, n):
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self.data *= n
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return self
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def insert(self, index, value):
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self[index:index] = value
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collections.MutableSequence.register(MutableString)
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if __name__ == "__main__":
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# execute the regression test to stdout, if called as a script:
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import os
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called_in_dir, called_as = os.path.split(sys.argv[0])
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called_as, py = os.path.splitext(called_as)
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if '-q' in sys.argv:
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from test import test_support
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test_support.verbose = 0
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__import__('test.test_' + called_as.lower())
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