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from contextlib import suppress
import numpy as np
import pytest
from xarray import Variable
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(str)
assert dtype.metadata["element_type"] == str
assert strings.is_unicode_dtype(dtype)
assert not strings.is_bytes_dtype(dtype)
assert strings.check_vlen_dtype(dtype) is str
dtype = strings.create_vlen_dtype(bytes)
assert dtype.metadata["element_type"] == bytes
assert not strings.is_unicode_dtype(dtype)
assert strings.is_bytes_dtype(dtype)
assert strings.check_vlen_dtype(dtype) is bytes
assert strings.check_vlen_dtype(np.dtype(object)) is None
def test_EncodedStringCoder_decode():
coder = strings.EncodedStringCoder()
raw_data = np.array([b"abc", "ß∂µ∆".encode()])
raw = Variable(("x",), raw_data, {"_Encoding": "utf-8"})
actual = coder.decode(raw)
expected = Variable(("x",), np.array(["abc", "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", "ß∂µ∆".encode()])
raw = Variable(("x",), raw_data, {"_Encoding": "utf-8"}).chunk()
actual = coder.decode(raw)
assert isinstance(actual.data, da.Array)
expected = Variable(("x",), np.array(["abc", "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(str)
raw_data = np.array(["abc", "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)),
],
)
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)
@pytest.mark.parametrize(
["original", "expected_char_dim_name"],
[
(Variable(("x",), [b"ab", b"cdef"]), "string4"),
(Variable(("x",), [b"ab", b"cdef"], encoding={"char_dim_name": "foo"}), "foo"),
],
)
def test_CharacterArrayCoder_char_dim_name(original, expected_char_dim_name):
coder = strings.CharacterArrayCoder()
encoded = coder.encode(original)
roundtripped = coder.decode(encoded)
assert encoded.dims[-1] == expected_char_dim_name
assert roundtripped.encoding["char_dim_name"] == expected_char_dim_name
assert roundtripped.dims[-1] == original.dims[-1]
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)
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