| //===----------------------------------------------------------------------===// |
| // 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 |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // UNSUPPORTED: c++03, c++11, c++14, c++17 |
| // UNSUPPORTED: libcpp-no-concepts |
| // UNSUPPORTED: libcpp-has-no-incomplete-format |
| // UNSUPPORTED: clang-11 |
| // TODO FMT Evaluate gcc-11 status |
| // UNSUPPORTED: gcc-11 |
| // UNSUPPORTED: apple-clang-12 |
| |
| // <format> |
| |
| // [format.formatter.spec]: |
| // Each header that declares the template `formatter` provides the following |
| // enabled specializations: |
| // For each `charT`, the string type specializations |
| // template<size_t N> struct formatter<const charT[N], charT>; |
| |
| #include <format> |
| #include <cassert> |
| #include <concepts> |
| #include <type_traits> |
| |
| #include "test_macros.h" |
| #include "make_string.h" |
| |
| #define STR(S) MAKE_STRING(CharT, S) |
| #define CSTR(S) MAKE_CSTRING(CharT, S) |
| |
| // This is based on the method found in |
| // clang/test/CXX/temp/temp.arg/temp.arg.nontype/p1-cxx20.cpp |
| template <size_t N> |
| struct Tester { |
| // This is not part of the real test, but is used the deduce the size of the input. |
| constexpr Tester(const char (&r)[N]) { __builtin_memcpy(text, r, N); } |
| char text[N]; |
| |
| // The size of the array shouldn't include the NUL character. |
| static const size_t size = N - 1; |
| |
| template <class CharT> |
| void test(const std::basic_string<CharT>& expected, |
| const std::basic_string_view<CharT>& fmt) const { |
| using Str = const CharT[size]; |
| std::basic_format_parse_context<CharT> parse_ctx{fmt}; |
| std::formatter<Str, CharT> formatter; |
| static_assert(std::semiregular<decltype(formatter)>); |
| |
| auto it = formatter.parse(parse_ctx); |
| assert(it == fmt.end() - (!fmt.empty() && fmt.back() == '}')); |
| |
| std::basic_string<CharT> result; |
| auto out = std::back_inserter(result); |
| using FormatCtxT = std::basic_format_context<decltype(out), CharT>; |
| |
| std::basic_string<CharT> buffer{text, text + N}; |
| // Note not too found of this hack |
| Str* data = reinterpret_cast<Str*>(buffer.c_str()); |
| |
| auto format_ctx = std::__format_context_create<decltype(out), CharT>( |
| out, std::make_format_args<FormatCtxT>(*data)); |
| formatter.format(*data, format_ctx); |
| assert(result == expected); |
| } |
| |
| template <class CharT> |
| void test_termination_condition(const std::basic_string<CharT>& expected, |
| const std::basic_string<CharT>& f) const { |
| // The format-spec is valid if completely consumed or terminates at a '}'. |
| // The valid inputs all end with a '}'. The test is executed twice: |
| // - first with the terminating '}', |
| // - second consuming the entire input. |
| std::basic_string_view<CharT> fmt{f}; |
| assert(fmt.back() == CharT('}') && "Pre-condition failure"); |
| |
| test(expected, fmt); |
| fmt.remove_suffix(1); |
| test(expected, fmt); |
| } |
| }; |
| |
| template <Tester t, class CharT> |
| void test_helper_wrapper(std::basic_string<CharT> expected, |
| std::basic_string<CharT> fmt) { |
| t.test_termination_condition(expected, fmt); |
| } |
| |
| template <class CharT> |
| void test_array() { |
| test_helper_wrapper<" azAZ09,./<>?">(STR(" azAZ09,./<>?"), STR("}")); |
| |
| std::basic_string<CharT> s(CSTR("abc\0abc"), 7); |
| test_helper_wrapper<"abc\0abc">(s, STR("}")); |
| |
| test_helper_wrapper<"world">(STR("world"), STR("}")); |
| test_helper_wrapper<"world">(STR("world"), STR("_>}")); |
| |
| test_helper_wrapper<"world">(STR(" world"), STR(">8}")); |
| test_helper_wrapper<"world">(STR("___world"), STR("_>8}")); |
| test_helper_wrapper<"world">(STR("_world__"), STR("_^8}")); |
| test_helper_wrapper<"world">(STR("world___"), STR("_<8}")); |
| |
| test_helper_wrapper<"world">(STR("world"), STR(".5}")); |
| test_helper_wrapper<"universe">(STR("unive"), STR(".5}")); |
| |
| test_helper_wrapper<"world">(STR("%world%"), STR("%^7.7}")); |
| test_helper_wrapper<"universe">(STR("univers"), STR("%^7.7}")); |
| } |
| |
| int main(int, char**) { |
| test_array<char>(); |
| #ifndef TEST_HAS_NO_WIDE_CHARACTERS |
| test_array<wchar_t>(); |
| #endif |
| |
| return 0; |
| } |