mirror of
https://github.com/pybind/pybind11.git
synced 2024-11-11 08:03:55 +00:00
b4939fcbfb
* Expand string_view support to str, bytes, memoryview
1. Allows constructing a str or bytes implicitly from a string_view;
this is essentially a small shortcut allowing a caller to write
`py::bytes{sv}` rather than `py::bytes{sv.data(), sv.size()}`.
2. Allows implicit conversion *to* string_view from py::bytes -- this
saves a fair bit more as currently there is no simple way to get such
a view of the bytes without copying it (or resorting to Python API
calls).
(This is not done for `str` because when the str contains unicode we
have to allocate to a temporary and so there might not be some string
data we can properly view without owning.)
3. Allows `memoryview::from_memory` to accept a string_view. As with
the other from_memory calls, it's entirely your responsibility to
keep it alive.
This also required moving the string_view availability detection into
detail/common.h because this PR needs it in pytypes.h, which is higher
up the include chain than cast.h where it was being detected currently.
* Move string_view include to pytypes.h
* CI-testing a fix for the "ambiguous conversion" issue.
This change is known to fix the `tensorflow::tstring` issue reported under https://github.com/pybind/pybind11/pull/3521#issuecomment-985100965
TODO: Minimal reproducer for the `tensorflow::tstring` issue.
* Make clang-tidy happy (hopefully).
* Adding minimal reproducer for the `tensorflow::tstring` issue.
Error without the enable_if trick:
```
/usr/local/google/home/rwgk/forked/pybind11/tests/test_builtin_casters.cpp:169:16: error: ambiguous conversion for functional-style cast from 'TypeWithBothOperatorStringAndStringView' to 'py::bytes'
return py::bytes(TypeWithBothOperatorStringAndStringView());
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/local/google/home/rwgk/forked/pybind11/include/pybind11/detail/../pytypes.h:1174:5: note: candidate constructor
bytes(const std::string &s) : bytes(s.data(), s.size()) { }
^
/usr/local/google/home/rwgk/forked/pybind11/include/pybind11/detail/../pytypes.h:1191:5: note: candidate constructor
bytes(std::string_view s) : bytes(s.data(), s.size()) { }
^
```
* Adding missing NOLINTNEXTLINE
* Also apply ambiguous conversion workaround to str()
Co-authored-by: Ralf W. Grosse-Kunstleve <rwgk@google.com>
551 lines
18 KiB
Python
551 lines
18 KiB
Python
# -*- coding: utf-8 -*-
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import pytest
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import env
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from pybind11_tests import IncType, UserType
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from pybind11_tests import builtin_casters as m
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def test_simple_string():
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assert m.string_roundtrip("const char *") == "const char *"
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def test_unicode_conversion():
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"""Tests unicode conversion and error reporting."""
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assert m.good_utf8_string() == u"Say utf8‽ 🎂 𝐀"
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assert m.good_utf16_string() == u"b‽🎂𝐀z"
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assert m.good_utf32_string() == u"a𝐀🎂‽z"
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assert m.good_wchar_string() == u"a⸘𝐀z"
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if hasattr(m, "has_u8string"):
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assert m.good_utf8_u8string() == u"Say utf8‽ 🎂 𝐀"
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with pytest.raises(UnicodeDecodeError):
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m.bad_utf8_string()
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with pytest.raises(UnicodeDecodeError):
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m.bad_utf16_string()
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# These are provided only if they actually fail (they don't when 32-bit and under Python 2.7)
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if hasattr(m, "bad_utf32_string"):
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with pytest.raises(UnicodeDecodeError):
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m.bad_utf32_string()
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if hasattr(m, "bad_wchar_string"):
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with pytest.raises(UnicodeDecodeError):
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m.bad_wchar_string()
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if hasattr(m, "has_u8string"):
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with pytest.raises(UnicodeDecodeError):
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m.bad_utf8_u8string()
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assert m.u8_Z() == "Z"
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assert m.u8_eacute() == u"é"
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assert m.u16_ibang() == u"‽"
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assert m.u32_mathbfA() == u"𝐀"
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assert m.wchar_heart() == u"♥"
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if hasattr(m, "has_u8string"):
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assert m.u8_char8_Z() == "Z"
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def test_single_char_arguments():
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"""Tests failures for passing invalid inputs to char-accepting functions"""
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def toobig_message(r):
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return "Character code point not in range({:#x})".format(r)
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toolong_message = "Expected a character, but multi-character string found"
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assert m.ord_char(u"a") == 0x61 # simple ASCII
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assert m.ord_char_lv(u"b") == 0x62
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assert (
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m.ord_char(u"é") == 0xE9
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) # requires 2 bytes in utf-8, but can be stuffed in a char
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with pytest.raises(ValueError) as excinfo:
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assert m.ord_char(u"Ā") == 0x100 # requires 2 bytes, doesn't fit in a char
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assert str(excinfo.value) == toobig_message(0x100)
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with pytest.raises(ValueError) as excinfo:
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assert m.ord_char(u"ab")
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assert str(excinfo.value) == toolong_message
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assert m.ord_char16(u"a") == 0x61
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assert m.ord_char16(u"é") == 0xE9
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assert m.ord_char16_lv(u"ê") == 0xEA
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assert m.ord_char16(u"Ā") == 0x100
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assert m.ord_char16(u"‽") == 0x203D
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assert m.ord_char16(u"♥") == 0x2665
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assert m.ord_char16_lv(u"♡") == 0x2661
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with pytest.raises(ValueError) as excinfo:
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assert m.ord_char16(u"🎂") == 0x1F382 # requires surrogate pair
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assert str(excinfo.value) == toobig_message(0x10000)
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with pytest.raises(ValueError) as excinfo:
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assert m.ord_char16(u"aa")
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assert str(excinfo.value) == toolong_message
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assert m.ord_char32(u"a") == 0x61
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assert m.ord_char32(u"é") == 0xE9
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assert m.ord_char32(u"Ā") == 0x100
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assert m.ord_char32(u"‽") == 0x203D
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assert m.ord_char32(u"♥") == 0x2665
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assert m.ord_char32(u"🎂") == 0x1F382
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with pytest.raises(ValueError) as excinfo:
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assert m.ord_char32(u"aa")
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assert str(excinfo.value) == toolong_message
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assert m.ord_wchar(u"a") == 0x61
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assert m.ord_wchar(u"é") == 0xE9
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assert m.ord_wchar(u"Ā") == 0x100
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assert m.ord_wchar(u"‽") == 0x203D
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assert m.ord_wchar(u"♥") == 0x2665
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if m.wchar_size == 2:
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with pytest.raises(ValueError) as excinfo:
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assert m.ord_wchar(u"🎂") == 0x1F382 # requires surrogate pair
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assert str(excinfo.value) == toobig_message(0x10000)
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else:
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assert m.ord_wchar(u"🎂") == 0x1F382
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with pytest.raises(ValueError) as excinfo:
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assert m.ord_wchar(u"aa")
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assert str(excinfo.value) == toolong_message
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if hasattr(m, "has_u8string"):
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assert m.ord_char8(u"a") == 0x61 # simple ASCII
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assert m.ord_char8_lv(u"b") == 0x62
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assert (
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m.ord_char8(u"é") == 0xE9
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) # requires 2 bytes in utf-8, but can be stuffed in a char
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with pytest.raises(ValueError) as excinfo:
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assert m.ord_char8(u"Ā") == 0x100 # requires 2 bytes, doesn't fit in a char
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assert str(excinfo.value) == toobig_message(0x100)
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with pytest.raises(ValueError) as excinfo:
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assert m.ord_char8(u"ab")
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assert str(excinfo.value) == toolong_message
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def test_bytes_to_string():
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"""Tests the ability to pass bytes to C++ string-accepting functions. Note that this is
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one-way: the only way to return bytes to Python is via the pybind11::bytes class."""
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# Issue #816
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def to_bytes(s):
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b = s if env.PY2 else s.encode("utf8")
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assert isinstance(b, bytes)
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return b
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assert m.strlen(to_bytes("hi")) == 2
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assert m.string_length(to_bytes("world")) == 5
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assert m.string_length(to_bytes("a\x00b")) == 3
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assert m.strlen(to_bytes("a\x00b")) == 1 # C-string limitation
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# passing in a utf8 encoded string should work
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assert m.string_length(u"💩".encode("utf8")) == 4
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@pytest.mark.skipif(not hasattr(m, "has_string_view"), reason="no <string_view>")
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def test_string_view(capture):
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"""Tests support for C++17 string_view arguments and return values"""
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assert m.string_view_chars("Hi") == [72, 105]
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assert m.string_view_chars("Hi 🎂") == [72, 105, 32, 0xF0, 0x9F, 0x8E, 0x82]
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assert m.string_view16_chars(u"Hi 🎂") == [72, 105, 32, 0xD83C, 0xDF82]
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assert m.string_view32_chars(u"Hi 🎂") == [72, 105, 32, 127874]
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if hasattr(m, "has_u8string"):
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assert m.string_view8_chars("Hi") == [72, 105]
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assert m.string_view8_chars(u"Hi 🎂") == [72, 105, 32, 0xF0, 0x9F, 0x8E, 0x82]
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assert m.string_view_return() == u"utf8 secret 🎂"
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assert m.string_view16_return() == u"utf16 secret 🎂"
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assert m.string_view32_return() == u"utf32 secret 🎂"
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if hasattr(m, "has_u8string"):
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assert m.string_view8_return() == u"utf8 secret 🎂"
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with capture:
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m.string_view_print("Hi")
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m.string_view_print("utf8 🎂")
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m.string_view16_print(u"utf16 🎂")
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m.string_view32_print(u"utf32 🎂")
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assert (
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capture
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== u"""
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Hi 2
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utf8 🎂 9
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utf16 🎂 8
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utf32 🎂 7
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"""
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)
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if hasattr(m, "has_u8string"):
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with capture:
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m.string_view8_print("Hi")
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m.string_view8_print(u"utf8 🎂")
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assert (
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capture
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== u"""
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Hi 2
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utf8 🎂 9
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"""
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)
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with capture:
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m.string_view_print("Hi, ascii")
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m.string_view_print("Hi, utf8 🎂")
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m.string_view16_print(u"Hi, utf16 🎂")
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m.string_view32_print(u"Hi, utf32 🎂")
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assert (
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capture
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== u"""
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Hi, ascii 9
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Hi, utf8 🎂 13
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Hi, utf16 🎂 12
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Hi, utf32 🎂 11
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"""
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)
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if hasattr(m, "has_u8string"):
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with capture:
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m.string_view8_print("Hi, ascii")
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m.string_view8_print(u"Hi, utf8 🎂")
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assert (
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capture
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== u"""
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Hi, ascii 9
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Hi, utf8 🎂 13
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"""
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)
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assert m.string_view_bytes() == b"abc \x80\x80 def"
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assert m.string_view_str() == u"abc ‽ def"
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assert m.string_view_from_bytes(u"abc ‽ def".encode("utf-8")) == u"abc ‽ def"
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if hasattr(m, "has_u8string"):
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assert m.string_view8_str() == u"abc ‽ def"
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if not env.PY2:
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assert m.string_view_memoryview() == "Have some 🎂".encode()
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assert m.bytes_from_type_with_both_operator_string_and_string_view() == b"success"
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assert m.str_from_type_with_both_operator_string_and_string_view() == "success"
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def test_integer_casting():
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"""Issue #929 - out-of-range integer values shouldn't be accepted"""
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assert m.i32_str(-1) == "-1"
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assert m.i64_str(-1) == "-1"
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assert m.i32_str(2000000000) == "2000000000"
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assert m.u32_str(2000000000) == "2000000000"
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if env.PY2:
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assert m.i32_str(long(-1)) == "-1" # noqa: F821 undefined name 'long'
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assert m.i64_str(long(-1)) == "-1" # noqa: F821 undefined name 'long'
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assert (
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m.i64_str(long(-999999999999)) # noqa: F821 undefined name 'long'
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== "-999999999999"
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)
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assert (
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m.u64_str(long(999999999999)) # noqa: F821 undefined name 'long'
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== "999999999999"
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)
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else:
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assert m.i64_str(-999999999999) == "-999999999999"
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assert m.u64_str(999999999999) == "999999999999"
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with pytest.raises(TypeError) as excinfo:
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m.u32_str(-1)
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assert "incompatible function arguments" in str(excinfo.value)
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with pytest.raises(TypeError) as excinfo:
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m.u64_str(-1)
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assert "incompatible function arguments" in str(excinfo.value)
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with pytest.raises(TypeError) as excinfo:
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m.i32_str(-3000000000)
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assert "incompatible function arguments" in str(excinfo.value)
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with pytest.raises(TypeError) as excinfo:
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m.i32_str(3000000000)
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assert "incompatible function arguments" in str(excinfo.value)
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if env.PY2:
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with pytest.raises(TypeError) as excinfo:
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m.u32_str(long(-1)) # noqa: F821 undefined name 'long'
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assert "incompatible function arguments" in str(excinfo.value)
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with pytest.raises(TypeError) as excinfo:
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m.u64_str(long(-1)) # noqa: F821 undefined name 'long'
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assert "incompatible function arguments" in str(excinfo.value)
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def test_int_convert():
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class Int(object):
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def __int__(self):
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return 42
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class NotInt(object):
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pass
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class Float(object):
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def __float__(self):
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return 41.99999
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class Index(object):
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def __index__(self):
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return 42
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class IntAndIndex(object):
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def __int__(self):
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return 42
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def __index__(self):
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return 0
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class RaisingTypeErrorOnIndex(object):
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def __index__(self):
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raise TypeError
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def __int__(self):
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return 42
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class RaisingValueErrorOnIndex(object):
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def __index__(self):
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raise ValueError
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def __int__(self):
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return 42
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convert, noconvert = m.int_passthrough, m.int_passthrough_noconvert
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def requires_conversion(v):
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pytest.raises(TypeError, noconvert, v)
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def cant_convert(v):
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pytest.raises(TypeError, convert, v)
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assert convert(7) == 7
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assert noconvert(7) == 7
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cant_convert(3.14159)
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# TODO: Avoid DeprecationWarning in `PyLong_AsLong` (and similar)
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# TODO: PyPy 3.8 does not behave like CPython 3.8 here yet (7.3.7)
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if (3, 8) <= env.PY < (3, 10) and env.CPYTHON:
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with env.deprecated_call():
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assert convert(Int()) == 42
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else:
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assert convert(Int()) == 42
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requires_conversion(Int())
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cant_convert(NotInt())
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cant_convert(Float())
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# Before Python 3.8, `PyLong_AsLong` does not pick up on `obj.__index__`,
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# but pybind11 "backports" this behavior.
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assert convert(Index()) == 42
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assert noconvert(Index()) == 42
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assert convert(IntAndIndex()) == 0 # Fishy; `int(DoubleThought)` == 42
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assert noconvert(IntAndIndex()) == 0
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assert convert(RaisingTypeErrorOnIndex()) == 42
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requires_conversion(RaisingTypeErrorOnIndex())
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assert convert(RaisingValueErrorOnIndex()) == 42
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requires_conversion(RaisingValueErrorOnIndex())
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def test_numpy_int_convert():
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np = pytest.importorskip("numpy")
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convert, noconvert = m.int_passthrough, m.int_passthrough_noconvert
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def require_implicit(v):
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pytest.raises(TypeError, noconvert, v)
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# `np.intc` is an alias that corresponds to a C++ `int`
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assert convert(np.intc(42)) == 42
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assert noconvert(np.intc(42)) == 42
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# The implicit conversion from np.float32 is undesirable but currently accepted.
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# TODO: Avoid DeprecationWarning in `PyLong_AsLong` (and similar)
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# TODO: PyPy 3.8 does not behave like CPython 3.8 here yet (7.3.7)
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# https://github.com/pybind/pybind11/issues/3408
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if (3, 8) <= env.PY < (3, 10) and env.CPYTHON:
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with env.deprecated_call():
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assert convert(np.float32(3.14159)) == 3
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else:
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assert convert(np.float32(3.14159)) == 3
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require_implicit(np.float32(3.14159))
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def test_tuple(doc):
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"""std::pair <-> tuple & std::tuple <-> tuple"""
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assert m.pair_passthrough((True, "test")) == ("test", True)
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assert m.tuple_passthrough((True, "test", 5)) == (5, "test", True)
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# Any sequence can be cast to a std::pair or std::tuple
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assert m.pair_passthrough([True, "test"]) == ("test", True)
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assert m.tuple_passthrough([True, "test", 5]) == (5, "test", True)
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assert m.empty_tuple() == ()
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assert (
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doc(m.pair_passthrough)
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== """
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pair_passthrough(arg0: Tuple[bool, str]) -> Tuple[str, bool]
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Return a pair in reversed order
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"""
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)
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assert (
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doc(m.tuple_passthrough)
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== """
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tuple_passthrough(arg0: Tuple[bool, str, int]) -> Tuple[int, str, bool]
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Return a triple in reversed order
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"""
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)
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assert m.rvalue_pair() == ("rvalue", "rvalue")
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assert m.lvalue_pair() == ("lvalue", "lvalue")
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assert m.rvalue_tuple() == ("rvalue", "rvalue", "rvalue")
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assert m.lvalue_tuple() == ("lvalue", "lvalue", "lvalue")
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assert m.rvalue_nested() == ("rvalue", ("rvalue", ("rvalue", "rvalue")))
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assert m.lvalue_nested() == ("lvalue", ("lvalue", ("lvalue", "lvalue")))
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assert m.int_string_pair() == (2, "items")
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def test_builtins_cast_return_none():
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"""Casters produced with PYBIND11_TYPE_CASTER() should convert nullptr to None"""
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assert m.return_none_string() is None
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assert m.return_none_char() is None
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assert m.return_none_bool() is None
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assert m.return_none_int() is None
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assert m.return_none_float() is None
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assert m.return_none_pair() is None
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def test_none_deferred():
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"""None passed as various argument types should defer to other overloads"""
|
||
assert not m.defer_none_cstring("abc")
|
||
assert m.defer_none_cstring(None)
|
||
assert not m.defer_none_custom(UserType())
|
||
assert m.defer_none_custom(None)
|
||
assert m.nodefer_none_void(None)
|
||
|
||
|
||
def test_void_caster():
|
||
assert m.load_nullptr_t(None) is None
|
||
assert m.cast_nullptr_t() is None
|
||
|
||
|
||
def test_reference_wrapper():
|
||
"""std::reference_wrapper for builtin and user types"""
|
||
assert m.refwrap_builtin(42) == 420
|
||
assert m.refwrap_usertype(UserType(42)) == 42
|
||
assert m.refwrap_usertype_const(UserType(42)) == 42
|
||
|
||
with pytest.raises(TypeError) as excinfo:
|
||
m.refwrap_builtin(None)
|
||
assert "incompatible function arguments" in str(excinfo.value)
|
||
|
||
with pytest.raises(TypeError) as excinfo:
|
||
m.refwrap_usertype(None)
|
||
assert "incompatible function arguments" in str(excinfo.value)
|
||
|
||
assert m.refwrap_lvalue().value == 1
|
||
assert m.refwrap_lvalue_const().value == 1
|
||
|
||
a1 = m.refwrap_list(copy=True)
|
||
a2 = m.refwrap_list(copy=True)
|
||
assert [x.value for x in a1] == [2, 3]
|
||
assert [x.value for x in a2] == [2, 3]
|
||
assert not a1[0] is a2[0] and not a1[1] is a2[1]
|
||
|
||
b1 = m.refwrap_list(copy=False)
|
||
b2 = m.refwrap_list(copy=False)
|
||
assert [x.value for x in b1] == [1, 2]
|
||
assert [x.value for x in b2] == [1, 2]
|
||
assert b1[0] is b2[0] and b1[1] is b2[1]
|
||
|
||
assert m.refwrap_iiw(IncType(5)) == 5
|
||
assert m.refwrap_call_iiw(IncType(10), m.refwrap_iiw) == [10, 10, 10, 10]
|
||
|
||
|
||
def test_complex_cast():
|
||
"""std::complex casts"""
|
||
assert m.complex_cast(1) == "1.0"
|
||
assert m.complex_cast(2j) == "(0.0, 2.0)"
|
||
|
||
|
||
def test_bool_caster():
|
||
"""Test bool caster implicit conversions."""
|
||
convert, noconvert = m.bool_passthrough, m.bool_passthrough_noconvert
|
||
|
||
def require_implicit(v):
|
||
pytest.raises(TypeError, noconvert, v)
|
||
|
||
def cant_convert(v):
|
||
pytest.raises(TypeError, convert, v)
|
||
|
||
# straight up bool
|
||
assert convert(True) is True
|
||
assert convert(False) is False
|
||
assert noconvert(True) is True
|
||
assert noconvert(False) is False
|
||
|
||
# None requires implicit conversion
|
||
require_implicit(None)
|
||
assert convert(None) is False
|
||
|
||
class A(object):
|
||
def __init__(self, x):
|
||
self.x = x
|
||
|
||
def __nonzero__(self):
|
||
return self.x
|
||
|
||
def __bool__(self):
|
||
return self.x
|
||
|
||
class B(object):
|
||
pass
|
||
|
||
# Arbitrary objects are not accepted
|
||
cant_convert(object())
|
||
cant_convert(B())
|
||
|
||
# Objects with __nonzero__ / __bool__ defined can be converted
|
||
require_implicit(A(True))
|
||
assert convert(A(True)) is True
|
||
assert convert(A(False)) is False
|
||
|
||
|
||
def test_numpy_bool():
|
||
np = pytest.importorskip("numpy")
|
||
|
||
convert, noconvert = m.bool_passthrough, m.bool_passthrough_noconvert
|
||
|
||
def cant_convert(v):
|
||
pytest.raises(TypeError, convert, v)
|
||
|
||
# np.bool_ is not considered implicit
|
||
assert convert(np.bool_(True)) is True
|
||
assert convert(np.bool_(False)) is False
|
||
assert noconvert(np.bool_(True)) is True
|
||
assert noconvert(np.bool_(False)) is False
|
||
cant_convert(np.zeros(2, dtype="int"))
|
||
|
||
|
||
def test_int_long():
|
||
"""In Python 2, a C++ int should return a Python int rather than long
|
||
if possible: longs are not always accepted where ints are used (such
|
||
as the argument to sys.exit()). A C++ long long is always a Python
|
||
long."""
|
||
|
||
import sys
|
||
|
||
must_be_long = type(getattr(sys, "maxint", 1) + 1)
|
||
assert isinstance(m.int_cast(), int)
|
||
assert isinstance(m.long_cast(), int)
|
||
assert isinstance(m.longlong_cast(), must_be_long)
|
||
|
||
|
||
def test_void_caster_2():
|
||
assert m.test_void_caster()
|
||
|
||
|
||
def test_const_ref_caster():
|
||
"""Verifies that const-ref is propagated through type_caster cast_op.
|
||
The returned ConstRefCasted type is a minimal type that is constructed to
|
||
reference the casting mode used.
|
||
"""
|
||
x = False
|
||
assert m.takes(x) == 1
|
||
assert m.takes_move(x) == 1
|
||
|
||
assert m.takes_ptr(x) == 3
|
||
assert m.takes_ref(x) == 2
|
||
assert m.takes_ref_wrap(x) == 2
|
||
|
||
assert m.takes_const_ptr(x) == 5
|
||
assert m.takes_const_ref(x) == 4
|
||
assert m.takes_const_ref_wrap(x) == 4
|