1 //===----------------------------------------------------------------------===//
2 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
3 // See https://llvm.org/LICENSE.txt for license information.
4 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
5 //
6 //===----------------------------------------------------------------------===//
7 
8 // UNSUPPORTED: c++03, c++11, c++14, c++17
9 // UNSUPPORTED: libcpp-has-no-incomplete-format
10 // TODO FMT Evaluate gcc-11 status
11 // UNSUPPORTED: gcc-11
12 
13 // Note this formatter shows additional information when tests are failing.
14 // This aids the development. Since other formatters fail in the same fashion
15 // they don't have this additional output.
16 
17 // <format>
18 
19 // template<class... Args>
20 //   string format(string_view fmt, const Args&... args);
21 // template<class... Args>
22 //   wstring format(wstring_view fmt, const Args&... args);
23 
24 #include <format>
25 #include <cassert>
26 #include <vector>
27 
28 #include "test_macros.h"
29 #include "format_tests.h"
30 
31 #ifndef TEST_HAS_NO_LOCALIZATION
32 #  include <iostream>
33 #endif
34 
35 auto test = []<class CharT, class... Args>(std::basic_string_view<CharT> expected, std::basic_string_view<CharT> fmt,
36                                            const Args&... args) {
37   std::basic_string<CharT> out = std::format(fmt, args...);
38 #ifndef TEST_HAS_NO_LOCALIZATION
39   if constexpr (std::same_as<CharT, char>)
40     if (out != expected)
41       std::cerr << "\nFormat string   " << fmt << "\nExpected output " << expected << "\nActual output   " << out
42                 << '\n';
43 #endif
44   assert(out == expected);
45 };
46 
47 auto test_exception = []<class CharT, class... Args>(std::string_view what, std::basic_string_view<CharT> fmt,
48                                                      const Args&... args) {
49 #ifndef TEST_HAS_NO_EXCEPTIONS
50   try {
51     std::format(fmt, args...);
52 #  ifndef TEST_HAS_NO_LOCALIZATION
53     if constexpr (std::same_as<CharT, char>)
54       std::cerr << "\nFormat string   " << fmt << "\nDidn't throw an exception.\n";
55 #  endif
56     assert(false);
57   } catch (const std::format_error& e) {
58     if constexpr (std::same_as<CharT, char>)
59 #  if defined(_LIBCPP_VERSION) && !defined(TEST_HAS_NO_LOCALIZATION)
60       if (e.what() != what)
61         std::cerr << "\nFormat string   " << fmt << "\nExpected exception " << what << "\nActual exception   "
62                   << e.what() << '\n';
63 #  endif
64     LIBCPP_ASSERT(e.what() == what);
65     return;
66   }
67   assert(false);
68 #endif
69   (void)what;
70   (void)fmt;
71   (void)sizeof...(args);
72 };
73 
74 int main(int, char**) {
75   format_tests<char>(test, test_exception);
76 
77 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
78   format_tests_char_to_wchar_t(test);
79   format_tests<wchar_t>(test, test_exception);
80 #endif
81 
82   return 0;
83 }
84