libcxx/test/std/utilities/format/format.range/format.range.fmtstr/parse.pass.cpp

   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, c++20
   9
  10 // TODO FMT Investigate why this fails.
  11 // UNSUPPORTED: stdlib=apple-libc++ && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
  12
  13 // <format>
  14
  15 // template<ranges::input_range R, class charT>
  16 //   requires (K == range_format::string || K == range_format::debug_string)
  17 // struct range-default-formatter<K, R, charT>
  18
  19 // template<class ParseContext>
  20 //   constexpr typename ParseContext::iterator
  21 //     parse(ParseContext& ctx);
  22
  23 // Note this tests the basics of this function. It's tested in more detail in
  24 // the format.functions test.
  25
  26 #include <cassert>
  27 #include <concepts>
  28 #include <format>
  29
  30 #include "format.functions.tests.h"
  31 #include "test_format_context.h"
  32 #include "test_macros.h"
  33
  34 template <class FormatterT, class StringViewT>
  35 constexpr void test_parse(StringViewT fmt, std::size_t offset) {
  36   using CharT    = typename StringViewT::value_type;
  37   auto parse_ctx = std::basic_format_parse_context<CharT>(fmt);
  38   FormatterT formatter;
  39   static_assert(std::semiregular<decltype(formatter)>);
  40
  41   std::same_as<typename StringViewT::iterator> auto it = formatter.parse(parse_ctx);
  42   assert(it == fmt.end() - offset);
  43 }
  44
  45 template <class StringViewT>
  46 constexpr void test_formatters(StringViewT fmt, std::size_t offset) {
  47   using CharT = typename StringViewT::value_type;
  48   test_parse<std::formatter<test_range_format_string<std::basic_string<CharT>>, CharT>>(fmt, offset);
  49   test_parse<std::formatter<test_range_format_debug_string<std::basic_string<CharT>>, CharT>>(fmt, offset);
  50 }
  51
  52 template <class CharT>
  53 constexpr void test_char_type() {
  54   test_formatters(SV(""), 0);
  55   test_formatters(SV("}"), 1);
  56 }
  57
  58 constexpr bool test() {
  59   test_char_type<char>();
  60 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
  61   test_char_type<wchar_t>();
  62 #endif
  63
  64   return true;
  65 }
  66
  67 int main(int, char**) {
  68   test();
  69   static_assert(test());
  70
  71   return 0;
  72 }