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import pytest
import numpy as np
from numpy.testing import assert_, assert_equal, assert_array_equal
def buffer_length(arr):
if isinstance(arr, str):
if not arr:
charmax = 0
else:
charmax = max([ord(c) for c in arr])
if charmax < 256:
size = 1
elif charmax < 65536:
size = 2
else:
size = 4
return size * len(arr)
v = memoryview(arr)
if v.shape is None:
return len(v) * v.itemsize
else:
return np.prod(v.shape) * v.itemsize
# In both cases below we need to make sure that the byte swapped value (as
# UCS4) is still a valid unicode:
# Value that can be represented in UCS2 interpreters
ucs2_value = '\u0900'
# Value that cannot be represented in UCS2 interpreters (but can in UCS4)
ucs4_value = '\U00100900'
def test_string_cast():
str_arr = np.array(["1234", "1234\0\0"], dtype='S')
uni_arr1 = str_arr.astype('>U')
uni_arr2 = str_arr.astype('<U')
assert_array_equal(str_arr != uni_arr1, np.ones(2, dtype=bool))
assert_array_equal(uni_arr1 != str_arr, np.ones(2, dtype=bool))
assert_array_equal(str_arr == uni_arr1, np.zeros(2, dtype=bool))
assert_array_equal(uni_arr1 == str_arr, np.zeros(2, dtype=bool))
assert_array_equal(uni_arr1, uni_arr2)
############################################################
# Creation tests
############################################################
class CreateZeros:
"""Check the creation of zero-valued arrays"""
def content_check(self, ua, ua_scalar, nbytes):
# Check the length of the unicode base type
assert_(int(ua.dtype.str[2:]) == self.ulen)
# Check the length of the data buffer
assert_(buffer_length(ua) == nbytes)
# Small check that data in array element is ok
assert_(ua_scalar == '')
# Encode to ascii and double check
assert_(ua_scalar.encode('ascii') == b'')
# Check buffer lengths for scalars
assert_(buffer_length(ua_scalar) == 0)
def test_zeros0D(self):
# Check creation of 0-dimensional objects
ua = np.zeros((), dtype='U%s' % self.ulen)
self.content_check(ua, ua[()], 4*self.ulen)
def test_zerosSD(self):
# Check creation of single-dimensional objects
ua = np.zeros((2,), dtype='U%s' % self.ulen)
self.content_check(ua, ua[0], 4*self.ulen*2)
self.content_check(ua, ua[1], 4*self.ulen*2)
def test_zerosMD(self):
# Check creation of multi-dimensional objects
ua = np.zeros((2, 3, 4), dtype='U%s' % self.ulen)
self.content_check(ua, ua[0, 0, 0], 4*self.ulen*2*3*4)
self.content_check(ua, ua[-1, -1, -1], 4*self.ulen*2*3*4)
class TestCreateZeros_1(CreateZeros):
"""Check the creation of zero-valued arrays (size 1)"""
ulen = 1
class TestCreateZeros_2(CreateZeros):
"""Check the creation of zero-valued arrays (size 2)"""
ulen = 2
class TestCreateZeros_1009(CreateZeros):
"""Check the creation of zero-valued arrays (size 1009)"""
ulen = 1009
class CreateValues:
"""Check the creation of unicode arrays with values"""
def content_check(self, ua, ua_scalar, nbytes):
# Check the length of the unicode base type
assert_(int(ua.dtype.str[2:]) == self.ulen)
# Check the length of the data buffer
assert_(buffer_length(ua) == nbytes)
# Small check that data in array element is ok
assert_(ua_scalar == self.ucs_value*self.ulen)
# Encode to UTF-8 and double check
assert_(ua_scalar.encode('utf-8') ==
(self.ucs_value*self.ulen).encode('utf-8'))
# Check buffer lengths for scalars
if self.ucs_value == ucs4_value:
# In UCS2, the \U0010FFFF will be represented using a
# surrogate *pair*
assert_(buffer_length(ua_scalar) == 2*2*self.ulen)
else:
# In UCS2, the \uFFFF will be represented using a
# regular 2-byte word
assert_(buffer_length(ua_scalar) == 2*self.ulen)
def test_values0D(self):
# Check creation of 0-dimensional objects with values
ua = np.array(self.ucs_value*self.ulen, dtype='U%s' % self.ulen)
self.content_check(ua, ua[()], 4*self.ulen)
def test_valuesSD(self):
# Check creation of single-dimensional objects with values
ua = np.array([self.ucs_value*self.ulen]*2, dtype='U%s' % self.ulen)
self.content_check(ua, ua[0], 4*self.ulen*2)
self.content_check(ua, ua[1], 4*self.ulen*2)
def test_valuesMD(self):
# Check creation of multi-dimensional objects with values
ua = np.array([[[self.ucs_value*self.ulen]*2]*3]*4, dtype='U%s' % self.ulen)
self.content_check(ua, ua[0, 0, 0], 4*self.ulen*2*3*4)
self.content_check(ua, ua[-1, -1, -1], 4*self.ulen*2*3*4)
class TestCreateValues_1_UCS2(CreateValues):
"""Check the creation of valued arrays (size 1, UCS2 values)"""
ulen = 1
ucs_value = ucs2_value
class TestCreateValues_1_UCS4(CreateValues):
"""Check the creation of valued arrays (size 1, UCS4 values)"""
ulen = 1
ucs_value = ucs4_value
class TestCreateValues_2_UCS2(CreateValues):
"""Check the creation of valued arrays (size 2, UCS2 values)"""
ulen = 2
ucs_value = ucs2_value
class TestCreateValues_2_UCS4(CreateValues):
"""Check the creation of valued arrays (size 2, UCS4 values)"""
ulen = 2
ucs_value = ucs4_value
class TestCreateValues_1009_UCS2(CreateValues):
"""Check the creation of valued arrays (size 1009, UCS2 values)"""
ulen = 1009
ucs_value = ucs2_value
class TestCreateValues_1009_UCS4(CreateValues):
"""Check the creation of valued arrays (size 1009, UCS4 values)"""
ulen = 1009
ucs_value = ucs4_value
############################################################
# Assignment tests
############################################################
class AssignValues:
"""Check the assignment of unicode arrays with values"""
def content_check(self, ua, ua_scalar, nbytes):
# Check the length of the unicode base type
assert_(int(ua.dtype.str[2:]) == self.ulen)
# Check the length of the data buffer
assert_(buffer_length(ua) == nbytes)
# Small check that data in array element is ok
assert_(ua_scalar == self.ucs_value*self.ulen)
# Encode to UTF-8 and double check
assert_(ua_scalar.encode('utf-8') ==
(self.ucs_value*self.ulen).encode('utf-8'))
# Check buffer lengths for scalars
if self.ucs_value == ucs4_value:
# In UCS2, the \U0010FFFF will be represented using a
# surrogate *pair*
assert_(buffer_length(ua_scalar) == 2*2*self.ulen)
else:
# In UCS2, the \uFFFF will be represented using a
# regular 2-byte word
assert_(buffer_length(ua_scalar) == 2*self.ulen)
def test_values0D(self):
# Check assignment of 0-dimensional objects with values
ua = np.zeros((), dtype='U%s' % self.ulen)
ua[()] = self.ucs_value*self.ulen
self.content_check(ua, ua[()], 4*self.ulen)
def test_valuesSD(self):
# Check assignment of single-dimensional objects with values
ua = np.zeros((2,), dtype='U%s' % self.ulen)
ua[0] = self.ucs_value*self.ulen
self.content_check(ua, ua[0], 4*self.ulen*2)
ua[1] = self.ucs_value*self.ulen
self.content_check(ua, ua[1], 4*self.ulen*2)
def test_valuesMD(self):
# Check assignment of multi-dimensional objects with values
ua = np.zeros((2, 3, 4), dtype='U%s' % self.ulen)
ua[0, 0, 0] = self.ucs_value*self.ulen
self.content_check(ua, ua[0, 0, 0], 4*self.ulen*2*3*4)
ua[-1, -1, -1] = self.ucs_value*self.ulen
self.content_check(ua, ua[-1, -1, -1], 4*self.ulen*2*3*4)
class TestAssignValues_1_UCS2(AssignValues):
"""Check the assignment of valued arrays (size 1, UCS2 values)"""
ulen = 1
ucs_value = ucs2_value
class TestAssignValues_1_UCS4(AssignValues):
"""Check the assignment of valued arrays (size 1, UCS4 values)"""
ulen = 1
ucs_value = ucs4_value
class TestAssignValues_2_UCS2(AssignValues):
"""Check the assignment of valued arrays (size 2, UCS2 values)"""
ulen = 2
ucs_value = ucs2_value
class TestAssignValues_2_UCS4(AssignValues):
"""Check the assignment of valued arrays (size 2, UCS4 values)"""
ulen = 2
ucs_value = ucs4_value
class TestAssignValues_1009_UCS2(AssignValues):
"""Check the assignment of valued arrays (size 1009, UCS2 values)"""
ulen = 1009
ucs_value = ucs2_value
class TestAssignValues_1009_UCS4(AssignValues):
"""Check the assignment of valued arrays (size 1009, UCS4 values)"""
ulen = 1009
ucs_value = ucs4_value
############################################################
# Byteorder tests
############################################################
class ByteorderValues:
"""Check the byteorder of unicode arrays in round-trip conversions"""
def test_values0D(self):
# Check byteorder of 0-dimensional objects
ua = np.array(self.ucs_value*self.ulen, dtype='U%s' % self.ulen)
ua2 = ua.newbyteorder()
# This changes the interpretation of the data region (but not the
# actual data), therefore the returned scalars are not
# the same (they are byte-swapped versions of each other).
assert_(ua[()] != ua2[()])
ua3 = ua2.newbyteorder()
# Arrays must be equal after the round-trip
assert_equal(ua, ua3)
def test_valuesSD(self):
# Check byteorder of single-dimensional objects
ua = np.array([self.ucs_value*self.ulen]*2, dtype='U%s' % self.ulen)
ua2 = ua.newbyteorder()
assert_((ua != ua2).all())
assert_(ua[-1] != ua2[-1])
ua3 = ua2.newbyteorder()
# Arrays must be equal after the round-trip
assert_equal(ua, ua3)
def test_valuesMD(self):
# Check byteorder of multi-dimensional objects
ua = np.array([[[self.ucs_value*self.ulen]*2]*3]*4,
dtype='U%s' % self.ulen)
ua2 = ua.newbyteorder()
assert_((ua != ua2).all())
assert_(ua[-1, -1, -1] != ua2[-1, -1, -1])
ua3 = ua2.newbyteorder()
# Arrays must be equal after the round-trip
assert_equal(ua, ua3)
def test_values_cast(self):
# Check byteorder of when casting the array for a strided and
# contiguous array:
test1 = np.array([self.ucs_value*self.ulen]*2, dtype='U%s' % self.ulen)
test2 = np.repeat(test1, 2)[::2]
for ua in (test1, test2):
ua2 = ua.astype(dtype=ua.dtype.newbyteorder())
assert_((ua == ua2).all())
assert_(ua[-1] == ua2[-1])
ua3 = ua2.astype(dtype=ua.dtype)
# Arrays must be equal after the round-trip
assert_equal(ua, ua3)
def test_values_updowncast(self):
# Check byteorder of when casting the array to a longer and shorter
# string length for strided and contiguous arrays
test1 = np.array([self.ucs_value*self.ulen]*2, dtype='U%s' % self.ulen)
test2 = np.repeat(test1, 2)[::2]
for ua in (test1, test2):
# Cast to a longer type with zero padding
longer_type = np.dtype('U%s' % (self.ulen+1)).newbyteorder()
ua2 = ua.astype(dtype=longer_type)
assert_((ua == ua2).all())
assert_(ua[-1] == ua2[-1])
# Cast back again with truncating:
ua3 = ua2.astype(dtype=ua.dtype)
# Arrays must be equal after the round-trip
assert_equal(ua, ua3)
class TestByteorder_1_UCS2(ByteorderValues):
"""Check the byteorder in unicode (size 1, UCS2 values)"""
ulen = 1
ucs_value = ucs2_value
class TestByteorder_1_UCS4(ByteorderValues):
"""Check the byteorder in unicode (size 1, UCS4 values)"""
ulen = 1
ucs_value = ucs4_value
class TestByteorder_2_UCS2(ByteorderValues):
"""Check the byteorder in unicode (size 2, UCS2 values)"""
ulen = 2
ucs_value = ucs2_value
class TestByteorder_2_UCS4(ByteorderValues):
"""Check the byteorder in unicode (size 2, UCS4 values)"""
ulen = 2
ucs_value = ucs4_value
class TestByteorder_1009_UCS2(ByteorderValues):
"""Check the byteorder in unicode (size 1009, UCS2 values)"""
ulen = 1009
ucs_value = ucs2_value
class TestByteorder_1009_UCS4(ByteorderValues):
"""Check the byteorder in unicode (size 1009, UCS4 values)"""
ulen = 1009
ucs_value = ucs4_value
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