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/*
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* Copyright (C) 2022 Riyyi
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*
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* SPDX-License-Identifier: MIT
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*/
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#pragma once
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#include <cassert>
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#include <cstddef> // size_t
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#include <cstdint> // int8_t, int32_t, int64_t, uint8_t, uint32_t
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#include <map>
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#include <string>
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#include <string_view>
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#include <type_traits> // is_integral_v, is_same
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#include <unordered_map>
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#include <vector>
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#include "util/format/builder.h"
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#include "util/format/parser.h"
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#include "util/meta/concepts.h"
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namespace Util::Format {
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enum class PresentationType : uint8_t {
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None, // Defaults are any of: 'dgcsp', depending on the type
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// Interger
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Binary = 98, // 'b'
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BinaryUppercase = 66, // 'B'
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Decimal = 100, // 'd'
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Octal = 111, // 'o'
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Hex = 120, // 'x'
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HexUppercase = 88, // 'X'
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// Floating-point
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Hexfloat = 97, // 'a'
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HexfloatUppercase = 65, // 'A'
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Exponent = 101, // 'e'
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ExponentUppercase = 69, // 'E'
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FixedPoint = 102, // 'f'
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FixedPointUppercase = 70, // 'F'
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General = 103, // 'g'
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GeneralUppercase = 71, // 'G'
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// Character
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Character = 99, // 'c'
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// String
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String = 115, // 's'
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// Pointer
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Pointer = 112, // 'p'
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};
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struct Specifier {
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char fill = ' ';
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Builder::Align align = Builder::Align::None;
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Builder::Sign sign = Builder::Sign::None;
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bool alternativeForm = false;
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bool zeroPadding = false;
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size_t width = 0;
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int8_t precision = -1;
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PresentationType type = PresentationType::None;
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};
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template<typename T>
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struct Formatter {
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Specifier specifier;
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constexpr void parse(Parser& parser)
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{
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if (std::is_same_v<T, char>) {
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parser.parseSpecifier(specifier, Parser::ParameterType::Char);
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}
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else if (std::is_same_v<T, std::string_view>) {
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parser.parseSpecifier(specifier, Parser::ParameterType::String);
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}
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}
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void format(Builder&, T) const {}
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};
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// Integral
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template<Integral T>
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struct Formatter<T> {
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Specifier specifier;
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void parse(Parser& parser)
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{
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parser.parseSpecifier(specifier, Parser::ParameterType::Integral);
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}
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void format(Builder& builder, T value) const
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{
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uint8_t base = 0;
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bool uppercase = false;
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switch (specifier.type) {
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case PresentationType::BinaryUppercase:
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uppercase = true;
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case PresentationType::Binary:
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base = 2;
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break;
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case PresentationType::Octal:
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base = 8;
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break;
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case PresentationType::None:
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case PresentationType::Decimal:
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base = 10;
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break;
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case PresentationType::HexUppercase:
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uppercase = true;
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case PresentationType::Hex:
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base = 16;
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break;
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default:
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assert(false);
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};
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if constexpr (std::is_unsigned_v<T>) {
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builder.putU64(
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value, base, uppercase, specifier.fill, specifier.align, specifier.sign,
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specifier.zeroPadding, specifier.width);
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}
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else {
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builder.putI64(
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value, base, uppercase, specifier.fill, specifier.align, specifier.sign,
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specifier.zeroPadding, specifier.width);
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}
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}
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};
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// Floating point
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template<FloatingPoint T>
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struct Formatter<T> {
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Specifier specifier;
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void parse(Parser& parser)
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{
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parser.parseSpecifier(specifier, Parser::ParameterType::FloatingPoint);
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}
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void format(Builder& builder, T value) const
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{
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if (specifier.precision < 0) {
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builder.putF64(value);
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return;
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}
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builder.putF64(value, specifier.precision);
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}
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};
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// Char
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template<>
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void Formatter<char>::format(Builder& builder, char value) const;
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template<>
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void Formatter<bool>::format(Builder& builder, bool value) const;
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// String
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template<>
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void Formatter<std::string_view>::format(Builder& builder, std::string_view value) const;
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template<>
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struct Formatter<std::string> : Formatter<std::string_view> {
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};
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template<>
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struct Formatter<const char*> : Formatter<std::string_view> {
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void parse(Parser& parser);
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void format(Builder& builder, const char* value) const;
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};
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template<>
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struct Formatter<char*> : Formatter<const char*> {
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};
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template<size_t N>
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struct Formatter<char[N]> : Formatter<const char*> {
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};
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// Pointer
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template<typename T>
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struct Formatter<T*> {
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Specifier specifier;
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constexpr void parse(Parser& parser)
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{
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parser.parseSpecifier(specifier, Parser::ParameterType::Pointer);
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}
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void format(Builder& builder, T* value) const
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{
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value == nullptr
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? builder.putString("nullptr")
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: builder.putPointer(static_cast<const void*>(value));
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}
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};
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template<>
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struct Formatter<std::nullptr_t> : Formatter<const void*> {
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void format(Builder& builder, std::nullptr_t) const;
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};
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// Container
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template<typename T>
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struct Formatter<std::vector<T>> : Formatter<T> {
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void format(Builder& builder, const std::vector<T>& value) const
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{
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builder.putString("{\n");
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for (auto it = value.cbegin(); it != value.cend(); ++it) {
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builder.putString(" ");
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Formatter<T>::format(builder, *it);
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// Add comma, except after the last element
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if (it != std::prev(value.end(), 1)) {
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builder.putCharacter(',');
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}
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builder.putCharacter('\n');
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}
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builder.putCharacter('}');
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}
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};
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#define UTIL_FORMAT_FORMAT_AS_MAP(type) \
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template<typename K, typename V> \
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struct Formatter<type<K, V>> \
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: Formatter<K> \
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, Formatter<V> { \
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void format(Builder& builder, const type<K, V>& value) const \
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{ \
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builder.putString("{\n"); \
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auto last = value.end(); \
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for (auto it = value.begin(); it != last; ++it) { \
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builder.putString(R"( ")"); \
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Formatter<K>::format(builder, it->first); \
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builder.putString(R"(": )"); \
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Formatter<V>::format(builder, it->second); \
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\
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/* Add comma, except after the last element */ \
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if (std::next(it) != last) { \
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builder.putCharacter(','); \
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} \
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\
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builder.putCharacter('\n'); \
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} \
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builder.putCharacter('}'); \
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} \
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}
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UTIL_FORMAT_FORMAT_AS_MAP(std::map);
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UTIL_FORMAT_FORMAT_AS_MAP(std::unordered_map);
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} // namespace Util::Format
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