//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef TEST_SUPPORT_CONCAT_MACROS_H
#define TEST_SUPPORT_CONCAT_MACROS_H
#include <cstdio>
#include <string>
#include "assert_macros.h"
#include "test_macros.h"
#ifndef TEST_HAS_NO_LOCALIZATION
# include <concepts>
# include <iterator>
# include <sstream>
#endif
#if TEST_STD_VER > 17
# ifndef TEST_HAS_NO_LOCALIZATION
[[nodiscard]] constexpr bool test_is_high_surrogate(char32_t value) { return value >= 0xd800 && value <= 0xdbff; }
[[nodiscard]] constexpr bool test_is_low_surrogate(char32_t value) { return value >= 0xdc00 && value <= 0xdfff; }
[[nodiscard]] constexpr bool test_is_surrogate(char32_t value) { return value >= 0xd800 && value <= 0xdfff; }
[[nodiscard]] constexpr bool test_is_code_point(char32_t value) { return value <= 0x10ffff; }
[[nodiscard]] constexpr bool test_is_scalar_value(char32_t value) {
return test_is_code_point(value) && !test_is_surrogate(value);
}
inline constexpr char32_t test_replacement_character = U'\ufffd';
template <class InIt, class OutIt>
OutIt test_transcode() = delete;
template <class InIt, class OutIt>
requires(std::output_iterator<OutIt, const char&> && std::same_as<std::iter_value_t<InIt>, char8_t>)
OutIt test_transcode(InIt first, InIt last, OutIt out_it) {
return std::copy(first, last, out_it);
}
template <class OutIt>
requires std::output_iterator<OutIt, const char&>
void test_encode(OutIt& out_it, char16_t value) {
if (value < 0x80)
*out_it++ = static_cast<char>(value);
else if (value < 0x800) {
*out_it++ = static_cast<char>(0b11000000 | (value >> 6));
*out_it++ = static_cast<char>(0b10000000 | (value & 0b00111111));
} else {
*out_it++ = static_cast<char>(0b11100000 | (value >> 12));
*out_it++ = static_cast<char>(0b10000000 | ((value) >> 6 & 0b00111111));
*out_it++ = static_cast<char>(0b10000000 | (value & 0b00111111));
}
}
template <class OutIt>
requires std::output_iterator<OutIt, const char&>
void test_encode(OutIt& out_it, char32_t value) {
if ((value & 0xffff0000) == 0)
test_encode(out_it, static_cast<char16_t>(value));
else {
*out_it++ = static_cast<char>(0b11100000 | (value >> 18));
*out_it++ = static_cast<char>(0b10000000 | ((value) >> 12 & 0b00111111));
*out_it++ = static_cast<char>(0b10000000 | ((value) >> 6 & 0b00111111));
*out_it++ = static_cast<char>(0b10000000 | (value & 0b00111111));
}
}
template <class InIt, class OutIt>
requires(std::output_iterator<OutIt, const char&> &&
(std::same_as<std::iter_value_t<InIt>, char16_t>
# ifndef TEST_HAS_NO_WIDE_CHARACTERS
|| (std::same_as<std::iter_value_t<InIt>, wchar_t> && sizeof(wchar_t) == 2)
# endif
))
OutIt test_transcode(InIt first, InIt last, OutIt out_it) {
while (first != last) {
char32_t value = *first++;
if (test_is_low_surrogate(value)) [[unlikely]] {
test_encode(out_it, static_cast<char16_t>(test_replacement_character));
continue;
}
if (!test_is_high_surrogate(value)) {
test_encode(out_it, static_cast<char16_t>(value));
continue;
}
if (first == last || !test_is_low_surrogate(static_cast<char32_t>(*first))) [[unlikely]] {
test_encode(out_it, static_cast<char16_t>(test_replacement_character));
continue;
}
value -= 0xd800;
value <<= 10;
value += static_cast<char32_t>(*first++) - 0xdc00;
value += 0x10000;
if (test_is_code_point(value)) [[likely]]
test_encode(out_it, value);
else
test_encode(out_it, static_cast<char16_t>(test_replacement_character));
}
return out_it;
}
template <class InIt, class OutIt>
requires(std::output_iterator<OutIt, const char&> &&
(std::same_as<std::iter_value_t<InIt>, char32_t>
# ifndef TEST_HAS_NO_WIDE_CHARACTERS
|| (std::same_as<std::iter_value_t<InIt>, wchar_t> && sizeof(wchar_t) == 4)
# endif
))
OutIt test_transcode(InIt first, InIt last, OutIt out_it) {
while (first != last) {
char32_t value = *first++;
if (test_is_code_point(value)) [[likely]]
test_encode(out_it, value);
else
test_encode(out_it, static_cast<char16_t>(test_replacement_character));
}
return out_it;
}
template <class T>
concept test_streamable = requires(std::stringstream& stream, T&& value) { stream << value; };
template <class R>
concept test_convertable_range = (!test_streamable<R> && requires(R&& value) {
std::basic_string_view{std::begin(value), std::end(value)};
});
template <class T>
concept test_can_concat = test_streamable<T> || test_convertable_range<T>;
template <test_streamable T>
std::ostream& test_concat(std::ostream& stream, T&& value) {
return stream << value;
}
template <test_convertable_range T>
std::ostream& test_concat(std::ostream& stream, T&& value) {
auto b = std::begin(value);
auto e = std::end(value);
if (b != e) {
// When T is an array it's string-literal, remove the NUL terminator.
if constexpr (std::is_array_v<std::remove_cvref_t<T>>) {
--e;
}
test_transcode(b, e, std::ostream_iterator<char>{stream});
}
return stream;
}
# endif // TEST_HAS_NO_LOCALIZATION
// If possible concatenates message for the assertion function, else returns a
// default message. Not being able to stream is not considered an error. For
// example, streaming to std::wcerr doesn't work properly in the CI. Therefore
// the formatting tests should only stream to std::string.
//
// The macro TEST_WRITE_CONCATENATED can be used to evaluate the arguments
// lazily. This useful when using this function in combination with
// assert_macros.h.
template <class... Args>
std::string test_concat_message([[maybe_unused]] Args&&... args) {
# ifndef TEST_HAS_NO_LOCALIZATION
if constexpr ((test_can_concat<Args> && ...)) {
std::stringstream sstr;
((test_concat(sstr, std::forward<Args>(args))), ...);
return sstr.str();
} else
# endif // TEST_HAS_NO_LOCALIZATION
return "Message discarded since it can't be streamed to std::cerr.\n";
}
// Writes its arguments to stderr, using the test_concat_message helper.
# define TEST_WRITE_CONCATENATED(...) [&] { ::test_eprintf("%s", ::test_concat_message(__VA_ARGS__).c_str()); }
#else
// Fallback definition before C++20 that allows using the macro but doesn't provide a very good message.
# define TEST_WRITE_CONCATENATED(...) [&] { ::test_eprintf("%s", TEST_STRINGIZE(__VA_ARGS__)); }
#endif // TEST_STD_VER > 17
#endif // TEST_SUPPORT_CONCAT_MACROS_H
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