/
test_coding_strings.py
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/
test_coding_strings.py
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# -*- coding: utf-8 -*-
from __future__ import absolute_import, division, print_function
import numpy as np
import pytest
from xarray import Variable
from xarray.core.pycompat import bytes_type, unicode_type, suppress
from xarray.coding import strings
from xarray.core import indexing
from . import (IndexerMaker, assert_array_equal, assert_identical,
raises_regex, requires_dask)
with suppress(ImportError):
import dask.array as da
def test_vlen_dtype():
dtype = strings.create_vlen_dtype(unicode_type)
assert dtype.metadata['element_type'] == unicode_type
assert strings.is_unicode_dtype(dtype)
assert not strings.is_bytes_dtype(dtype)
assert strings.check_vlen_dtype(dtype) is unicode_type
dtype = strings.create_vlen_dtype(bytes_type)
assert dtype.metadata['element_type'] == bytes_type
assert not strings.is_unicode_dtype(dtype)
assert strings.is_bytes_dtype(dtype)
assert strings.check_vlen_dtype(dtype) is bytes_type
assert strings.check_vlen_dtype(np.dtype(object)) is None
def test_EncodedStringCoder_decode():
coder = strings.EncodedStringCoder()
raw_data = np.array([b'abc', u'ß∂µ∆'.encode('utf-8')])
raw = Variable(('x',), raw_data, {'_Encoding': 'utf-8'})
actual = coder.decode(raw)
expected = Variable(
('x',), np.array([u'abc', u'ß∂µ∆'], dtype=object))
assert_identical(actual, expected)
assert_identical(coder.decode(actual[0]), expected[0])
@requires_dask
def test_EncodedStringCoder_decode_dask():
coder = strings.EncodedStringCoder()
raw_data = np.array([b'abc', u'ß∂µ∆'.encode('utf-8')])
raw = Variable(('x',), raw_data, {'_Encoding': 'utf-8'}).chunk()
actual = coder.decode(raw)
assert isinstance(actual.data, da.Array)
expected = Variable(('x',), np.array([u'abc', u'ß∂µ∆'], dtype=object))
assert_identical(actual, expected)
actual_indexed = coder.decode(actual[0])
assert isinstance(actual_indexed.data, da.Array)
assert_identical(actual_indexed, expected[0])
def test_EncodedStringCoder_encode():
dtype = strings.create_vlen_dtype(unicode_type)
raw_data = np.array([u'abc', u'ß∂µ∆'], dtype=dtype)
expected_data = np.array([r.encode('utf-8') for r in raw_data],
dtype=object)
coder = strings.EncodedStringCoder(allows_unicode=True)
raw = Variable(('x',), raw_data, encoding={'dtype': 'S1'})
actual = coder.encode(raw)
expected = Variable(('x',), expected_data, attrs={'_Encoding': 'utf-8'})
assert_identical(actual, expected)
raw = Variable(('x',), raw_data)
assert_identical(coder.encode(raw), raw)
coder = strings.EncodedStringCoder(allows_unicode=False)
assert_identical(coder.encode(raw), expected)
@pytest.mark.parametrize('original', [
Variable(('x',), [b'ab', b'cdef']),
Variable((), b'ab'),
Variable(('x',), [b'a', b'b']),
Variable((), b'a'),
])
def test_CharacterArrayCoder_roundtrip(original):
coder = strings.CharacterArrayCoder()
roundtripped = coder.decode(coder.encode(original))
assert_identical(original, roundtripped)
@pytest.mark.parametrize('data', [
np.array([b'a', b'bc']),
np.array([b'a', b'bc'], dtype=strings.create_vlen_dtype(bytes_type)),
])
def test_CharacterArrayCoder_encode(data):
coder = strings.CharacterArrayCoder()
raw = Variable(('x',), data)
actual = coder.encode(raw)
expected = Variable(('x', 'string2'),
np.array([[b'a', b''], [b'b', b'c']]))
assert_identical(actual, expected)
def test_StackedBytesArray():
array = np.array([[b'a', b'b', b'c'], [b'd', b'e', b'f']], dtype='S')
actual = strings.StackedBytesArray(array)
expected = np.array([b'abc', b'def'], dtype='S')
assert actual.dtype == expected.dtype
assert actual.shape == expected.shape
assert actual.size == expected.size
assert actual.ndim == expected.ndim
assert len(actual) == len(expected)
assert_array_equal(expected, actual)
B = IndexerMaker(indexing.BasicIndexer)
assert_array_equal(expected[:1], actual[B[:1]])
with pytest.raises(IndexError):
actual[B[:, :2]]
def test_StackedBytesArray_scalar():
array = np.array([b'a', b'b', b'c'], dtype='S')
actual = strings.StackedBytesArray(array)
expected = np.array(b'abc')
assert actual.dtype == expected.dtype
assert actual.shape == expected.shape
assert actual.size == expected.size
assert actual.ndim == expected.ndim
with pytest.raises(TypeError):
len(actual)
np.testing.assert_array_equal(expected, actual)
B = IndexerMaker(indexing.BasicIndexer)
with pytest.raises(IndexError):
actual[B[:2]]
def test_StackedBytesArray_vectorized_indexing():
array = np.array([[b'a', b'b', b'c'], [b'd', b'e', b'f']], dtype='S')
stacked = strings.StackedBytesArray(array)
expected = np.array([[b'abc', b'def'], [b'def', b'abc']])
V = IndexerMaker(indexing.VectorizedIndexer)
indexer = V[np.array([[0, 1], [1, 0]])]
actual = stacked[indexer]
assert_array_equal(actual, expected)
def test_char_to_bytes():
array = np.array([[b'a', b'b', b'c'], [b'd', b'e', b'f']])
expected = np.array([b'abc', b'def'])
actual = strings.char_to_bytes(array)
assert_array_equal(actual, expected)
expected = np.array([b'ad', b'be', b'cf'])
actual = strings.char_to_bytes(array.T) # non-contiguous
assert_array_equal(actual, expected)
def test_char_to_bytes_ndim_zero():
expected = np.array(b'a')
actual = strings.char_to_bytes(expected)
assert_array_equal(actual, expected)
def test_char_to_bytes_size_zero():
array = np.zeros((3, 0), dtype='S1')
expected = np.array([b'', b'', b''])
actual = strings.char_to_bytes(array)
assert_array_equal(actual, expected)
@requires_dask
def test_char_to_bytes_dask():
numpy_array = np.array([[b'a', b'b', b'c'], [b'd', b'e', b'f']])
array = da.from_array(numpy_array, ((2,), (3,)))
expected = np.array([b'abc', b'def'])
actual = strings.char_to_bytes(array)
assert isinstance(actual, da.Array)
assert actual.chunks == ((2,),)
assert actual.dtype == 'S3'
assert_array_equal(np.array(actual), expected)
with raises_regex(ValueError, 'stacked dask character array'):
strings.char_to_bytes(array.rechunk(1))
def test_bytes_to_char():
array = np.array([[b'ab', b'cd'], [b'ef', b'gh']])
expected = np.array([[[b'a', b'b'], [b'c', b'd']],
[[b'e', b'f'], [b'g', b'h']]])
actual = strings.bytes_to_char(array)
assert_array_equal(actual, expected)
expected = np.array([[[b'a', b'b'], [b'e', b'f']],
[[b'c', b'd'], [b'g', b'h']]])
actual = strings.bytes_to_char(array.T) # non-contiguous
assert_array_equal(actual, expected)
@requires_dask
def test_bytes_to_char_dask():
numpy_array = np.array([b'ab', b'cd'])
array = da.from_array(numpy_array, ((1, 1),))
expected = np.array([[b'a', b'b'], [b'c', b'd']])
actual = strings.bytes_to_char(array)
assert isinstance(actual, da.Array)
assert actual.chunks == ((1, 1), ((2,)))
assert actual.dtype == 'S1'
assert_array_equal(np.array(actual), expected)