48 lines
1.3 KiB
C++
48 lines
1.3 KiB
C++
/*
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Custom argument formatter tests
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Copyright (c) 2016, Victor Zverovich
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All rights reserved.
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For the license information refer to format.h.
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*/
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#include "fmt/printf.h"
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#include "gtest-extra.h"
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using fmt::printf_arg_formatter;
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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 CustomArgFormatter : public fmt::arg_formatter<char> {
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public:
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CustomArgFormatter(fmt::buffer &buf, fmt::basic_context<char> &ctx,
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fmt::format_specs &s)
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: fmt::arg_formatter<char>(buf, ctx, s) {}
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using fmt::arg_formatter<char>::operator();
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void operator()(double value) {
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if (round(value * pow(10, spec().precision())) == 0)
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value = 0;
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fmt::arg_formatter<char>::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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// Pass custom argument formatter as a template arg to vwrite.
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fmt::vformat_to<CustomArgFormatter>(buffer, format_str, 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_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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