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import sys
from numerictypes import string_, unicode_, integer, object_
from numeric import ndarray, broadcast, empty, compare_chararrays
from numeric import array as narray
__all__ = ['chararray']
_globalvar = 0
_unicode = unicode
# special sub-class for character arrays (string_ and unicode_)
# This adds + and * operations and methods of str and unicode types
# which operate on an element-by-element basis
# It also strips white-space on element retrieval and on
# comparisons
class chararray(ndarray):
def __new__(subtype, shape, itemsize=1, unicode=False, buffer=None,
offset=0, strides=None, order='C'):
global _globalvar
if unicode:
dtype = unicode_
else:
dtype = string_
_globalvar = 1
if buffer is None:
self = ndarray.__new__(subtype, shape, (dtype, itemsize),
order=order)
else:
self = ndarray.__new__(subtype, shape, (dtype, itemsize),
buffer=buffer,
offset=offset, strides=strides,
order=order)
_globalvar = 0
return self
def __array_finalize__(self, obj):
# The b is a special case because it is used for reconstructing.
if not _globalvar and self.dtype.char not in 'SUb':
raise ValueError, "Can only create a chararray from string data."
def __getitem__(self, obj):
val = ndarray.__getitem__(self, obj)
if isinstance(val, (string_, unicode_)):
temp = val.rstrip()
if len(temp) == 0:
val = ''
else:
val = temp
return val
def __eq__(self, other):
return compare_chararrays(self, other, '==', True)
def __ne__(self, other):
return compare_chararrays(self, other, '!=', True)
def __ge__(self, other):
return compare_chararrays(self, other, '>=', True)
def __le__(self, other):
return compare_chararrays(self, other, '<=', True)
def __gt__(self, other):
return compare_chararrays(self, other, '>', True)
def __lt__(self, other):
return compare_chararrays(self, other, '<', True)
def __add__(self, other):
b = broadcast(self, other)
arr = b.iters[1].base
outitem = self.itemsize + arr.itemsize
result = chararray(b.shape, outitem, self.dtype is unicode_)
res = result.flat
for k, val in enumerate(b):
res[k] = (val[0] + val[1])
return result
def __radd__(self, other):
b = broadcast(other, self)
outitem = b.iters[0].base.itemsize + \
b.iters[1].base.itemsize
result = chararray(b.shape, outitem, self.dtype is unicode_)
res = result.flat
for k, val in enumerate(b):
res[k] = (val[0] + val[1])
return result
def __mul__(self, other):
b = broadcast(self, other)
arr = b.iters[1].base
if not issubclass(arr.dtype.type, integer):
raise ValueError, "Can only multiply by integers"
outitem = b.iters[0].base.itemsize * arr.max()
result = chararray(b.shape, outitem, self.dtype is unicode_)
res = result.flat
for k, val in enumerate(b):
res[k] = val[0]*val[1]
return result
def __rmul__(self, other):
b = broadcast(self, other)
arr = b.iters[1].base
if not issubclass(arr.dtype.type, integer):
raise ValueError, "Can only multiply by integers"
outitem = b.iters[0].base.itemsize * arr.max()
result = chararray(b.shape, outitem, self.dtype is unicode_)
res = result.flat
for k, val in enumerate(b):
res[k] = val[0]*val[1]
return result
def __mod__(self, other):
b = broadcast(self, other)
res = [None]*b.size
maxsize = -1
for k,val in enumerate(b):
newval = val[0] % val[1]
maxsize = max(len(newval), maxsize)
res[k] = newval
newarr = chararray(b.shape, maxsize, self.dtype is unicode_)
newarr[:] = res
return newarr
def __rmod__(self, other):
return NotImplemented
def argsort(self, axis=-1, kind='quicksort', order=None):
return self.__array__().argsort(axis, kind, order)
def _generalmethod(self, name, myiter):
res = [None]*myiter.size
maxsize = -1
for k, val in enumerate(myiter):
newval = []
for chk in val[1:]:
if not chk or (chk.dtype is object_ and chk.item() is None):
break
newval.append(chk)
newitem = getattr(val[0],name)(*newval)
maxsize = max(len(newitem), maxsize)
res[k] = newitem
newarr = chararray(myiter.shape, maxsize, self.dtype is unicode_)
newarr[:] = res
return newarr
def _typedmethod(self, name, myiter, dtype):
result = empty(myiter.shape, dtype=dtype)
res = result.flat
for k, val in enumerate(myiter):
newval = []
for chk in val[1:]:
if not chk or (chk.dtype is object_ and chk.item() is None):
break
newval.append(chk)
this_str = val[0].rstrip('\x00')
newitem = getattr(this_str,name)(*newval)
res[k] = newitem
return result
def _samemethod(self, name):
result = self.copy()
res = result.flat
for k, val in enumerate(self.flat):
res[k] = getattr(val, name)()
return result
def capitalize(self):
return self._samemethod('capitalize')
if sys.version[:3] >= '2.4':
def center(self, width, fillchar=' '):
return self._generalmethod('center',
broadcast(self, width, fillchar))
def ljust(self, width, fillchar=' '):
return self._generalmethod('ljust',
broadcast(self, width, fillchar))
def rjust(self, width, fillchar=' '):
return self._generalmethod('rjust',
broadcast(self, width, fillchar))
def rsplit(self, sep=None, maxsplit=None):
return self._typedmethod('rsplit', broadcast(self, sep, maxsplit),
object)
else:
def ljust(self, width):
return self._generalmethod('ljust', broadcast(self, width))
def rjust(self, width):
return self._generalmethod('rjust', broadcast(self, width))
def center(self, width):
return self._generalmethod('center', broadcast(self, width))
def count(self, sub, start=None, end=None):
return self._typedmethod('count', broadcast(self, sub, start, end), int)
def decode(self,encoding=None,errors=None):
return self._generalmethod('decode', broadcast(self, encoding, errors))
def encode(self,encoding=None,errors=None):
return self._generalmethod('encode', broadcast(self, encoding, errors))
def endswith(self, suffix, start=None, end=None):
return self._typedmethod('endswith', broadcast(self, suffix, start, end), bool)
def expandtabs(self, tabsize=None):
return self._generalmethod('endswith', broadcast(self, tabsize))
def find(self, sub, start=None, end=None):
return self._typedmethod('find', broadcast(self, sub, start, end), int)
def index(self, sub, start=None, end=None):
return self._typedmethod('index', broadcast(self, sub, start, end), int)
def _ismethod(self, name):
result = empty(self.shape, dtype=bool)
res = result.flat
for k, val in enumerate(self.flat):
item = val.rstrip('\x00')
res[k] = getattr(item, name)()
return result
def isalnum(self):
return self._ismethod('isalnum')
def isalpha(self):
return self._ismethod('isalpha')
def isdigit(self):
return self._ismethod('isdigit')
def islower(self):
return self._ismethod('islower')
def isspace(self):
return self._ismethod('isspace')
def istitle(self):
return self._ismethod('istitle')
def isupper(self):
return self._ismethod('isupper')
def join(self, seq):
return self._generalmethod('join', broadcast(self, seq))
def lower(self):
return self._samemethod('lower')
def lstrip(self, chars):
return self._generalmethod('lstrip', broadcast(self, chars))
def replace(self, old, new, count=None):
return self._generalmethod('replace', broadcast(self, old, new, count))
def rfind(self, sub, start=None, end=None):
return self._typedmethod('rfind', broadcast(self, sub, start, end), int)
def rindex(self, sub, start=None, end=None):
return self._typedmethod('rindex', broadcast(self, sub, start, end), int)
def rstrip(self, chars=None):
return self._generalmethod('rstrip', broadcast(self, chars))
def split(self, sep=None, maxsplit=None):
return self._typedmethod('split', broadcast(self, sep, maxsplit), object)
def splitlines(self, keepends=None):
return self._typedmethod('splitlines', broadcast(self, keepends), object)
def startswith(self, prefix, start=None, end=None):
return self._typedmethod('startswith', broadcast(self, prefix, start, end), bool)
def strip(self, chars=None):
return self._generalmethod('strip', broadcast(self, chars))
def swapcase(self):
return self._samemethod('swapcase')
def title(self):
return self._samemethod('title')
def translate(self, table, deletechars=None):
if self.dtype is unicode_:
return self._generalmethod('translate', broadcast(self, table))
else:
return self._generalmethod('translate', broadcast(self, table, deletechars))
def upper(self):
return self._samemethod('upper')
def zfill(self, width):
return self._generalmethod('zfill', broadcast(self, width))
def array(obj, itemsize=None, copy=True, unicode=False, order=None):
if isinstance(obj, chararray):
if itemsize is None:
itemsize = obj.itemsize
if copy or (itemsize != obj.itemsize) \
or (not unicode and obj.dtype == unicode_) \
or (unicode and obj.dtype == string_):
return obj.astype("%s%d" % (obj.dtype.char, itemsize))
else:
return obj
if isinstance(obj, ndarray) and (obj.dtype in [unicode_, string_]):
new = obj.view(chararray)
if unicode and obj.dtype == string_:
return new.astype((unicode_, obj.itemsize))
elif obj.dtype == unicode_:
return new.astype((string_, obj.itemsize))
if copy: return new.copy()
else: return new
if unicode: dtype = "U"
else: dtype = "S"
if itemsize is not None:
dtype += str(itemsize)
if isinstance(obj, (str, _unicode)):
if itemsize is None:
itemsize = len(obj)
shape = len(obj) / itemsize
return chararray(shape, itemsize=itemsize, unicode=unicode,
buffer=obj)
# default
val = narray(obj, dtype=dtype, order=order, subok=1)
return val.view(chararray)
def asarray(obj, itemsize=None, unicode=False, order=None):
return array(obj, itemsize, copy=False,
unicode=unicode, order=order)
|
