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#pragma once
#include "Exception.h"
#include "String.h"
#include <charconv>
namespace cru {
inline String ToString(bool value) {
return value ? String(u"true") : String(u"false");
}
template <typename T>
std::enable_if_t<std::is_integral_v<T>, String> ToString(T value) {
std::array<char, 50> buffer;
auto result =
std::to_chars(buffer.data(), buffer.data() + buffer.size(), value);
if (result.ec == std::errc{}) {
} else {
throw std::invalid_argument("Failed to convert value to chars.");
}
auto size = result.ptr - buffer.data();
auto b = new char16_t[size + 1];
b[size] = 0;
std::copy(buffer.data(), result.ptr, b);
return String::FromBuffer(b, size, size);
}
template <typename T>
std::enable_if_t<std::is_floating_point_v<T>, String> ToString(T value) {
auto str = std::to_string(value);
return String(str.cbegin(), str.cend());
}
template <typename T>
std::enable_if_t<
std::is_convertible_v<decltype(ToString(std::declval<const T&>)), String>,
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(const String& 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(const String& 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)...);
}
} // namespace cru
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