API: Allow newaxis indexing for `array_api` arrays (#21377)

* TST: Add test checking if newaxis indexing works for `array_api`

Also removes previous check against newaxis indexing, which is now outdated

* TST, BUG: Allow `None` in `array_api` indexing

Introduces test for validating flat indexing when `None` is present

* MAINT,DOC,TST: Rework of `_validate_index()` in `numpy.array_api`

_validate_index() is now called as self._validate_index(shape), and does not
return a key. This rework removes the recursive pattern used. Tests are
introduced to cover some edge cases. Additionally, its internal docstring
reflects new behaviour, and extends the flat indexing note.

* MAINT: `advance` -> `advanced` (integer indexing)

Co-authored-by: Aaron Meurer <asmeurer@gmail.com>

* BUG: array_api arrays use internal arrays from array_api array keys

When an array_api array is passed as the key for get/setitem, we access the
key's internal np.ndarray array to be used as the key for the internal
get/setitem operation. This behaviour was initially removed when
`_validate_index()` was reworked.

* MAINT: Better flat indexing error message for `array_api` arrays

Also better semantics for its prior ellipsis count condition

Co-authored-by: Sebastian Berg <sebastian@sipsolutions.net>

* MAINT: `array_api` arrays don't special case multi-ellipsis errors

This gets handled by NumPy-proper.

Co-authored-by: Aaron Meurer <asmeurer@gmail.com>
Co-authored-by: Sebastian Berg <sebastian@sipsolutions.net>

0 files changed, 0 insertions, 0 deletions