fmt/test/locale-test.cc

// Formatting library for C++ - locale tests
//
// Copyright (c) 2012 - present, Victor Zverovich
// All rights reserved.
//
// For the license information refer to format.h.

#include "fmt/locale.h"
#include "gmock.h"

#ifndef FMT_STATIC_THOUSANDS_SEPARATOR
template <typename Char> struct numpunct : std::numpunct<Char> {
 protected:
  Char do_decimal_point() const FMT_OVERRIDE { return '?'; }
  Char do_thousands_sep() const FMT_OVERRIDE { return '~'; }
};

TEST(LocaleTest, DoubleDecimalPoint) {
  std::locale loc(std::locale(), new numpunct<char>());
  EXPECT_EQ("1?23", fmt::format(loc, "{:n}", 1.23));
  // Test with Grisu disabled.
  fmt::memory_buffer buf;
  fmt::internal::writer w(buf, fmt::internal::locale_ref(loc));
  auto specs = fmt::format_specs();
  specs.type = 'n';
  w.write_double<double, false>(1.23, specs);
  EXPECT_EQ(fmt::to_string(buf), "1?23");
}

TEST(LocaleTest, Format) {
  std::locale loc(std::locale(), new numpunct<char>());
  EXPECT_EQ("1,234,567", fmt::format(std::locale(), "{:n}", 1234567));
  EXPECT_EQ("1~234~567", fmt::format(loc, "{:n}", 1234567));
  fmt::format_arg_store<fmt::format_context, int> as{1234567};
  EXPECT_EQ("1~234~567", fmt::vformat(loc, "{:n}", fmt::format_args(as)));
  std::string s;
  fmt::format_to(std::back_inserter(s), loc, "{:n}", 1234567);
  EXPECT_EQ("1~234~567", s);
}

TEST(LocaleTest, WFormat) {
  std::locale loc(std::locale(), new numpunct<wchar_t>());
  EXPECT_EQ(L"1,234,567", fmt::format(std::locale(), L"{:n}", 1234567));
  EXPECT_EQ(L"1~234~567", fmt::format(loc, L"{:n}", 1234567));
  fmt::format_arg_store<fmt::wformat_context, int> as{1234567};
  EXPECT_EQ(L"1~234~567", fmt::vformat(loc, L"{:n}", fmt::wformat_args(as)));
  auto sep =
      std::use_facet<std::numpunct<wchar_t>>(std::locale("C")).thousands_sep();
  auto result = sep == ',' ? L"1,234,567" : L"1234567";
  EXPECT_EQ(result, fmt::format(std::locale("C"), L"{:n}", 1234567));
}
#endif  // FMT_STATIC_THOUSANDS_SEPARATOR