Add tests for array data access /index methods

tests/test_numpy_array.cpp

@@ -8,38 +8,87 @@
 */
 
 #include "pybind11_tests.h"
+
 #include <pybind11/numpy.h>
 #include <pybind11/stl.h>
 
+#include <cstdint>
+#include <vector>
+
+using arr = py::array;
+using arr_t = py::array_t<uint16_t, 0>;
+
+template<typename... Ix> arr data(const arr& a, Ix&&... index) {
+    return arr(a.nbytes() - a.offset_at(index...), (const uint8_t *) a.data(index...));
+}
+
+template<typename... Ix> arr data_t(const arr_t& a, Ix&&... index) {
+    return arr(a.size() - a.index_at(index...), a.data(index...));
+}
+
+arr& mutate_data(arr& a) {
+    auto ptr = (uint8_t *) a.mutable_data();
+    for (size_t i = 0; i < a.nbytes(); i++)
+        ptr[i] = (uint8_t) (ptr[i] * 2);
+    return a;
+}
+
+arr_t& mutate_data_t(arr_t& a) {
+    auto ptr = a.mutable_data();
+    for (size_t i = 0; i < a.size(); i++)
+        ptr[i]++;
+    return a;
+}
+
+template<typename... Ix> arr& mutate_data(arr& a, Ix&&... index) {
+    auto ptr = (uint8_t *) a.mutable_data(index...);
+    for (size_t i = 0; i < a.nbytes() - a.offset_at(index...); i++)
+        ptr[i] = (uint8_t) (ptr[i] * 2);
+    return a;
+}
+
+template<typename... Ix> arr_t& mutate_data_t(arr_t& a, Ix&&... index) {
+    auto ptr = a.mutable_data(index...);
+    for (size_t i = 0; i < a.size() - a.index_at(index...); i++)
+        ptr[i]++;
+    return a;
+}
+
+template<typename... Ix> size_t index_at(const arr& a, Ix&&... idx) { return a.index_at(idx...); }
+template<typename... Ix> size_t index_at_t(const arr_t& a, Ix&&... idx) { return a.index_at(idx...); }
+template<typename... Ix> size_t offset_at(const arr& a, Ix&&... idx) { return a.offset_at(idx...); }
+template<typename... Ix> size_t offset_at_t(const arr_t& a, Ix&&... idx) { return a.offset_at(idx...); }
+template<typename... Ix> size_t at_t(const arr_t& a, Ix&&... idx) { return a.at(idx...); }
+template<typename... Ix> arr_t& mutate_at_t(arr_t& a, Ix&&... idx) { a.mutable_at(idx...)++; return a; }
+
+#define def_index_fn(name, type) \
+    sm.def(#name, [](type a) { return name(a); }); \
+    sm.def(#name, [](type a, int i) { return name(a, i); }); \
+    sm.def(#name, [](type a, int i, int j) { return name(a, i, j); }); \
+    sm.def(#name, [](type a, int i, int j, int k) { return name(a, i, j, k); });
+
 test_initializer numpy_array([](py::module &m) {
-    m.def("get_arr_ndim", [](const py::array& arr) {
-        return arr.ndim();
-    });
-    m.def("get_arr_shape", [](const py::array& arr) {
-        return std::vector<size_t>(arr.shape(), arr.shape() + arr.ndim());
-    });
-    m.def("get_arr_shape", [](const py::array& arr, size_t dim) {
-        return arr.shape(dim);
-    });
-    m.def("get_arr_strides", [](const py::array& arr) {
-        return std::vector<size_t>(arr.strides(), arr.strides() + arr.ndim());
-    });
-    m.def("get_arr_strides", [](const py::array& arr, size_t dim) {
-        return arr.strides(dim);
-    });
-    m.def("get_arr_writeable", [](const py::array& arr) {
-        return arr.writeable();
-    });
-    m.def("get_arr_size", [](const py::array& arr) {
-        return arr.size();
-    });
-    m.def("get_arr_itemsize", [](const py::array& arr) {
-        return arr.itemsize();
-    });
-    m.def("get_arr_nbytes", [](const py::array& arr) {
-        return arr.nbytes();
-    });
-    m.def("get_arr_owndata", [](const py::array& arr) {
-        return arr.owndata();
-    });
+    auto sm = m.def_submodule("array");
+
+    sm.def("ndim", [](const arr& a) { return a.ndim(); });
+    sm.def("shape", [](const arr& a) { return arr(a.ndim(), a.shape()); });
+    sm.def("shape", [](const arr& a, size_t dim) { return a.shape(dim); });
+    sm.def("strides", [](const arr& a) { return arr(a.ndim(), a.strides()); });
+    sm.def("strides", [](const arr& a, size_t dim) { return a.strides(dim); });
+    sm.def("writeable", [](const arr& a) { return a.writeable(); });
+    sm.def("size", [](const arr& a) { return a.size(); });
+    sm.def("itemsize", [](const arr& a) { return a.itemsize(); });
+    sm.def("nbytes", [](const arr& a) { return a.nbytes(); });
+    sm.def("owndata", [](const arr& a) { return a.owndata(); });
+
+    def_index_fn(data, const arr&);
+    def_index_fn(data_t, const arr_t&);
+    def_index_fn(index_at, const arr&);
+    def_index_fn(index_at_t, const arr_t&);
+    def_index_fn(offset_at, const arr&);
+    def_index_fn(offset_at_t, const arr_t&);
+    def_index_fn(mutate_data, arr&);
+    def_index_fn(mutate_data_t, arr_t&);
+    def_index_fn(at_t, const arr_t&);
+    def_index_fn(mutate_at_t, arr_t&);
 });

tests/test_numpy_array.py

@@ -4,40 +4,147 @@ with pytest.suppress(ImportError):
     import numpy as np
 
 
+@pytest.fixture(scope='function')
+def arr():
+    return np.array([[1, 2, 3], [4, 5, 6]], '<u2')
+
+
 @pytest.requires_numpy
 def test_array_attributes():
-    from pybind11_tests import (get_arr_ndim, get_arr_shape, get_arr_strides, get_arr_writeable,
-                                get_arr_size, get_arr_itemsize, get_arr_nbytes, get_arr_owndata)
+    from pybind11_tests.array import (
+        ndim, shape, strides, writeable, size, itemsize, nbytes, owndata
+    )
 
     a = np.array(0, 'f8')
-    assert get_arr_ndim(a) == 0
-    assert get_arr_shape(a) == []
-    assert get_arr_strides(a) == []
-    with pytest.raises(RuntimeError):
-        get_arr_shape(a, 1)
-    with pytest.raises(RuntimeError):
-        get_arr_strides(a, 0)
-    assert get_arr_writeable(a)
-    assert get_arr_size(a) == 1
-    assert get_arr_itemsize(a) == 8
-    assert get_arr_nbytes(a) == 8
-    assert get_arr_owndata(a)
+    assert ndim(a) == 0
+    assert all(shape(a) == [])
+    assert all(strides(a) == [])
+    with pytest.raises(IndexError) as excinfo:
+        shape(a, 0)
+    assert str(excinfo.value) == 'invalid axis: 0 (ndim = 0)'
+    with pytest.raises(IndexError) as excinfo:
+        strides(a, 0)
+    assert str(excinfo.value) == 'invalid axis: 0 (ndim = 0)'
+    assert writeable(a)
+    assert size(a) == 1
+    assert itemsize(a) == 8
+    assert nbytes(a) == 8
+    assert owndata(a)
 
     a = np.array([[1, 2, 3], [4, 5, 6]], 'u2').view()
     a.flags.writeable = False
-    assert get_arr_ndim(a) == 2
-    assert get_arr_shape(a) == [2, 3]
-    assert get_arr_shape(a, 0) == 2
-    assert get_arr_shape(a, 1) == 3
-    assert get_arr_strides(a) == [6, 2]
-    assert get_arr_strides(a, 0) == 6
-    assert get_arr_strides(a, 1) == 2
-    with pytest.raises(RuntimeError):
-        get_arr_shape(a, 2)
-    with pytest.raises(RuntimeError):
-        get_arr_strides(a, 2)
-    assert not get_arr_writeable(a)
-    assert get_arr_size(a) == 6
-    assert get_arr_itemsize(a) == 2
-    assert get_arr_nbytes(a) == 12
-    assert not get_arr_owndata(a)
+    assert ndim(a) == 2
+    assert all(shape(a) == [2, 3])
+    assert shape(a, 0) == 2
+    assert shape(a, 1) == 3
+    assert all(strides(a) == [6, 2])
+    assert strides(a, 0) == 6
+    assert strides(a, 1) == 2
+    with pytest.raises(IndexError) as excinfo:
+        shape(a, 2)
+    assert str(excinfo.value) == 'invalid axis: 2 (ndim = 2)'
+    with pytest.raises(IndexError) as excinfo:
+        strides(a, 2)
+    assert str(excinfo.value) == 'invalid axis: 2 (ndim = 2)'
+    assert not writeable(a)
+    assert size(a) == 6
+    assert itemsize(a) == 2
+    assert nbytes(a) == 12
+    assert not owndata(a)
+
+
+@pytest.requires_numpy
+@pytest.mark.parametrize('args, ret', [([], 0), ([0], 0), ([1], 3), ([0, 1], 1), ([1, 2], 5)])
+def test_index_offset(arr, args, ret):
+    from pybind11_tests.array import index_at, index_at_t, offset_at, offset_at_t
+    assert index_at(arr, *args) == ret
+    assert index_at_t(arr, *args) == ret
+    assert offset_at(arr, *args) == ret * arr.dtype.itemsize
+    assert offset_at_t(arr, *args) == ret * arr.dtype.itemsize
+
+
+@pytest.requires_numpy
+def test_dim_check_fail(arr):
+    from pybind11_tests.array import (index_at, index_at_t, offset_at, offset_at_t, data, data_t,
+                                      mutate_data, mutate_data_t)
+    for func in (index_at, index_at_t, offset_at, offset_at_t, data, data_t,
+                 mutate_data, mutate_data_t):
+        with pytest.raises(IndexError) as excinfo:
+            func(arr, 1, 2, 3)
+        assert str(excinfo.value) == 'too many indices for an array: 3 (ndim = 2)'
+
+
+@pytest.requires_numpy
+@pytest.mark.parametrize('args, ret',
+                         [([], [1, 2, 3, 4, 5, 6]),
+                          ([1], [4, 5, 6]),
+                          ([0, 1], [2, 3, 4, 5, 6]),
+                          ([1, 2], [6])])
+def test_data(arr, args, ret):
+    from pybind11_tests.array import data, data_t
+    assert all(data_t(arr, *args) == ret)
+    assert all(data(arr, *args)[::2] == ret)
+    assert all(data(arr, *args)[1::2] == 0)
+
+
+@pytest.requires_numpy
+def test_mutate_readonly(arr):
+    from pybind11_tests.array import mutate_data, mutate_data_t, mutate_at_t
+    arr.flags.writeable = False
+    for func, args in (mutate_data, ()), (mutate_data_t, ()), (mutate_at_t, (0, 0)):
+        with pytest.raises(RuntimeError) as excinfo:
+            func(arr, *args)
+        assert str(excinfo.value) == 'array is not writeable'
+
+
+@pytest.requires_numpy
+@pytest.mark.parametrize('dim', [0, 1, 3])
+def test_at_fail(arr, dim):
+    from pybind11_tests.array import at_t, mutate_at_t
+    for func in at_t, mutate_at_t:
+        with pytest.raises(IndexError) as excinfo:
+            func(arr, *([0] * dim))
+        assert str(excinfo.value) == 'index dimension mismatch: {} (ndim = 2)'.format(dim)
+
+
+@pytest.requires_numpy
+def test_at(arr):
+    from pybind11_tests.array import at_t, mutate_at_t
+
+    assert at_t(arr, 0, 2) == 3
+    assert at_t(arr, 1, 0) == 4
+
+    assert all(mutate_at_t(arr, 0, 2).ravel() == [1, 2, 4, 4, 5, 6])
+    assert all(mutate_at_t(arr, 1, 0).ravel() == [1, 2, 4, 5, 5, 6])
+
+
+@pytest.requires_numpy
+def test_mutate_data(arr):
+    from pybind11_tests.array import mutate_data, mutate_data_t
+
+    assert all(mutate_data(arr).ravel() == [2, 4, 6, 8, 10, 12])
+    assert all(mutate_data(arr).ravel() == [4, 8, 12, 16, 20, 24])
+    assert all(mutate_data(arr, 1).ravel() == [4, 8, 12, 32, 40, 48])
+    assert all(mutate_data(arr, 0, 1).ravel() == [4, 16, 24, 64, 80, 96])
+    assert all(mutate_data(arr, 1, 2).ravel() == [4, 16, 24, 64, 80, 192])
+
+    assert all(mutate_data_t(arr).ravel() == [5, 17, 25, 65, 81, 193])
+    assert all(mutate_data_t(arr).ravel() == [6, 18, 26, 66, 82, 194])
+    assert all(mutate_data_t(arr, 1).ravel() == [6, 18, 26, 67, 83, 195])
+    assert all(mutate_data_t(arr, 0, 1).ravel() == [6, 19, 27, 68, 84, 196])
+    assert all(mutate_data_t(arr, 1, 2).ravel() == [6, 19, 27, 68, 84, 197])
+
+
+@pytest.requires_numpy
+def test_bounds_check(arr):
+    from pybind11_tests.array import (index_at, index_at_t, data, data_t,
+                                      mutate_data, mutate_data_t, at_t, mutate_at_t)
+    funcs = (index_at, index_at_t, data, data_t,
+             mutate_data, mutate_data_t, at_t, mutate_at_t)
+    for func in funcs:
+        with pytest.raises(IndexError) as excinfo:
+            index_at(arr, 2, 0)
+        assert str(excinfo.value) == 'index 2 is out of bounds for axis 0 with size 2'
+        with pytest.raises(IndexError) as excinfo:
+            index_at(arr, 0, 4)
+        assert str(excinfo.value) == 'index 4 is out of bounds for axis 1 with size 3'