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80 lines
2.6 KiB
C++
80 lines
2.6 KiB
C++
#ifndef COMPONENTS_MISC_STRINGS_FORMAT_H
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#define COMPONENTS_MISC_STRINGS_FORMAT_H
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#include <MyGUI_UString.h>
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#include <cerrno>
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#include <cstdio>
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#include <cstring>
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#include <stdexcept>
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#include <string>
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#include <string_view>
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#include <system_error>
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#include <vector>
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namespace Misc::StringUtils
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{
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namespace Details
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{
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// Allow to convert complex arguments to C-style strings for format() function
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template <typename T>
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T argument(T value) noexcept
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{
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static_assert(!std::is_same_v<T, std::string_view>, "std::string_view is not supported");
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static_assert(!std::is_same_v<T, MyGUI::UString>, "MyGUI::UString is not supported");
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return value;
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}
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template <typename T>
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T const* argument(std::basic_string<T> const& value) noexcept
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{
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return value.c_str();
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}
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template <class T>
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T nullTerminated(T value) noexcept
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{
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return value;
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}
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template <class T>
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std::basic_string<T> nullTerminated(const std::basic_string_view<T>& value) noexcept
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{
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// Ensure string_view arguments are null-terminated by creating a string
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// TODO: Use a format function that doesn't require this workaround
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return std::string{ value };
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}
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// Requires some C++11 features:
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// 1. std::string needs to be contiguous
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// 2. std::snprintf with zero size (second argument) returns an output string size
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// 3. variadic templates support
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template <typename... Args>
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std::string format(const char* fmt, Args const&... args)
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{
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const int size = std::snprintf(nullptr, 0, fmt, argument(args)...);
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if (size < 0)
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throw std::system_error(errno, std::generic_category(), "Failed to compute resulting string size");
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// Note: sprintf also writes a trailing null character. We should remove it.
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std::string ret(static_cast<std::size_t>(size) + 1, '\0');
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if (std::sprintf(ret.data(), fmt, argument(args)...) < 0)
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throw std::system_error(errno, std::generic_category(), "Failed to format string");
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ret.erase(static_cast<std::size_t>(size));
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return ret;
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}
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}
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template <typename... Args>
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std::string format(const char* fmt, Args const&... args)
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{
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return Details::format(fmt, Details::nullTerminated(args)...);
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}
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template <typename... Args>
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std::string format(const std::string& fmt, Args const&... args)
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{
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return Details::format(fmt.c_str(), Details::nullTerminated(args)...);
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}
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}
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#endif
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