58 lines
1.8 KiB
C++
58 lines
1.8 KiB
C++
// Formatting library for C++ - custom argument formatter tests
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//
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// Copyright (c) 2012 - present, Victor Zverovich
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// All rights reserved.
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//
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// For the license information refer to format.h.
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#ifndef _CRT_SECURE_NO_WARNINGS
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#define _CRT_SECURE_NO_WARNINGS
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#endif
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#include "fmt/format.h"
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#include "gtest-extra.h"
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// MSVC 2013 is known to be broken.
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#if !FMT_MSC_VER || FMT_MSC_VER > 1800
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// A custom argument formatter that doesn't print `-` for floating-point values
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// rounded to 0.
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class custom_arg_formatter
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: public fmt::detail::arg_formatter<fmt::format_context::iterator, char> {
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public:
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using base = fmt::detail::arg_formatter<fmt::format_context::iterator, char>;
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custom_arg_formatter(fmt::format_context& ctx,
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fmt::format_parse_context* parse_ctx,
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fmt::format_specs* s = nullptr,
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const char* = nullptr)
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: base(ctx, parse_ctx, s) {}
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using base::operator();
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iterator operator()(double value) {
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// Comparing a float to 0.0 is safe.
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if (round(value * pow(10, specs()->precision)) == 0.0) value = 0;
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return base::operator()(value);
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}
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};
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std::string custom_vformat(fmt::string_view format_str, fmt::format_args args) {
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fmt::memory_buffer buffer;
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fmt::detail::buffer<char>& base = buffer;
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// Pass custom argument formatter as a template arg to vwrite.
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fmt::vformat_to<custom_arg_formatter>(std::back_inserter(base), format_str,
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args);
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return std::string(buffer.data(), buffer.size());
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}
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template <typename... Args>
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std::string custom_format(const char* format_str, const Args&... args) {
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auto va = fmt::make_format_args(args...);
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return custom_vformat(format_str, va);
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}
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TEST(CustomFormatterTest, Format) {
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EXPECT_EQ("0.00", custom_format("{:.2f}", -.00001));
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}
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#endif
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