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#pragma once
#include "Exception.h"
#include "String.h"
#include <cassert>
#include <cstdio>
#include <format>
#include <type_traits>
#include <vector>
namespace cru {
inline String ToString(bool value) {
return value ? String(u"true") : String(u"false");
}
template <typename T>
inline constexpr std::nullptr_t kPrintfFormatSpecifierOfType = nullptr;
#define CRU_DEFINE_PRINTF_FORMAT_SPECIFIER_OF_TYPE(type, specifier) \
template <> \
inline constexpr const char* kPrintfFormatSpecifierOfType<type> = specifier;
CRU_DEFINE_PRINTF_FORMAT_SPECIFIER_OF_TYPE(signed char, "%c")
CRU_DEFINE_PRINTF_FORMAT_SPECIFIER_OF_TYPE(unsigned char, "%c")
CRU_DEFINE_PRINTF_FORMAT_SPECIFIER_OF_TYPE(signed short, "%hd")
CRU_DEFINE_PRINTF_FORMAT_SPECIFIER_OF_TYPE(unsigned short, "%hu")
CRU_DEFINE_PRINTF_FORMAT_SPECIFIER_OF_TYPE(signed int, "%d")
CRU_DEFINE_PRINTF_FORMAT_SPECIFIER_OF_TYPE(unsigned int, "%u")
CRU_DEFINE_PRINTF_FORMAT_SPECIFIER_OF_TYPE(signed long, "%ld")
CRU_DEFINE_PRINTF_FORMAT_SPECIFIER_OF_TYPE(unsigned long, "%lu")
CRU_DEFINE_PRINTF_FORMAT_SPECIFIER_OF_TYPE(signed long long, "%lld")
CRU_DEFINE_PRINTF_FORMAT_SPECIFIER_OF_TYPE(unsigned long long, "%llu")
CRU_DEFINE_PRINTF_FORMAT_SPECIFIER_OF_TYPE(float, "%f")
CRU_DEFINE_PRINTF_FORMAT_SPECIFIER_OF_TYPE(double, "%f")
#undef CRU_DEFINE_PRINTF_FORMAT_SPECIFIER_OF_TYPE
template <typename T>
std::enable_if_t<
!std::is_null_pointer_v<decltype(kPrintfFormatSpecifierOfType<T>)>, String>
ToString(T value) {
auto size = std::snprintf(nullptr, 0, kPrintfFormatSpecifierOfType<T>, value);
assert(size > 0);
std::vector<char> buffer(size + 1);
size = std::snprintf(buffer.data(), size + 1, kPrintfFormatSpecifierOfType<T>,
value);
assert(size > 0);
return String::FromUtf8(buffer.data(), size);
}
template <typename T>
String ToString(const T& value, StringView option) {
CRU_UNUSED(option)
return ToString(value);
}
inline String ToString(String value) { return value; }
namespace details {
enum class FormatTokenType { PlaceHolder, Text };
enum class FormatPlaceHolderType { None, Positioned, Named };
struct FormatToken {
static FormatToken Text() {
return FormatToken{FormatTokenType::Text, {}, {}, 0, {}, {}};
}
static FormatToken NonePlaceHolder(String option) {
return FormatToken(FormatTokenType::PlaceHolder, {},
FormatPlaceHolderType::None, 0, {}, std::move(option));
}
static FormatToken PositionedPlaceHolder(int position, String option) {
return FormatToken(FormatTokenType::PlaceHolder, {},
FormatPlaceHolderType::Positioned, position, {},
std::move(option));
}
static FormatToken NamedPlaceHolder(String name, String option) {
return FormatToken(FormatTokenType::PlaceHolder, {},
FormatPlaceHolderType::Named, 0, std::move(name),
std::move(option));
}
FormatToken(FormatTokenType type, String data,
FormatPlaceHolderType place_holder_type,
int place_holder_position, String place_holder_name,
String place_holder_option)
: type(type),
data(std::move(data)),
place_holder_type(place_holder_type),
place_holder_position(place_holder_position),
place_holder_name(std::move(place_holder_name)),
place_holder_option(std::move(place_holder_option)) {}
CRU_DEFAULT_COPY(FormatToken)
CRU_DEFAULT_MOVE(FormatToken)
CRU_DEFAULT_DESTRUCTOR(FormatToken)
FormatTokenType type;
String data;
FormatPlaceHolderType place_holder_type;
int place_holder_position;
String place_holder_name;
String place_holder_option;
};
std::vector<FormatToken> CRU_BASE_API ParseToFormatTokenList(StringView str);
void CRU_BASE_API FormatAppendFromFormatTokenList(
String& current, const std::vector<FormatToken>& format_token_list,
Index index);
template <typename TA, typename... T>
void FormatAppendFromFormatTokenList(
String& current, const std::vector<FormatToken>& format_token_list,
Index index, TA&& args0, T&&... args) {
for (Index i = index; i < static_cast<Index>(format_token_list.size()); i++) {
const auto& token = format_token_list[i];
if (token.type == FormatTokenType::PlaceHolder) {
if (token.place_holder_type == FormatPlaceHolderType::None) {
current += ToString(std::forward<TA>(args0), token.place_holder_option);
FormatAppendFromFormatTokenList(current, format_token_list, i + 1,
std::forward<T>(args)...);
return;
} else {
throw Exception(
u"Currently do not support positional or named place holder.");
}
} else {
current += token.data;
}
}
}
} // namespace details
template <typename... T>
String Format(StringView format, T&&... args) {
String result;
details::FormatAppendFromFormatTokenList(
result, details::ParseToFormatTokenList(format), 0,
std::forward<T>(args)...);
return result;
}
template <typename... T>
String String::Format(T&&... args) const {
return cru::Format(*this, std::forward<T>(args)...);
}
template <typename T>
struct ImplementFormatterByToUtf8String {
template <class ParseContext>
constexpr ParseContext::iterator parse(ParseContext& ctx) const {
auto iter = ctx.begin();
if (*iter != '}') {
throw std::format_error(
"ImplementFormatterByToUtf8String does not accept format args.");
}
return iter;
}
template <class FmtContext>
FmtContext::iterator format(const T& object, FmtContext& ctx) const {
return std::ranges::copy(ToUtf8String(object), ctx.out()).out;
}
};
} // namespace cru
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