80 lines
6.9 KiB
C++
80 lines
6.9 KiB
C++
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#include <algorithm>
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#include <sstream>
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#include <stdexcept>
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#include <vector>
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#include "MacroUtils.hpp"
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#define ENUM_CASE(x, name) \
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case name::x: \
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return #x;
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#
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#define ENUM_PARSE_CASE(x, name) \
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case ConstHash(#x): \
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return name::x;
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#
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#define ENUM_TRY_PARSE_CASE(x, name) \
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case ConstHash(#x): \
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out = name::x; \
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return true;
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#
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#define ENUM_PARSE_CASE_INSENSITIVE(x, name) \
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case ConstHashCI(#x): \
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return name::x;
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#
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#define ENUM_TRY_PARSE_CASE_INSENSITIVE(x, name) \
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case ConstHashCI(#x): \
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out = name::x; \
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return true;
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#
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#define ARRAY_NAME(x, name) name::x,
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/*!
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\def ENUM(name, type, values...)
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Generates an enum class inheriting from specified type with specified name. Also generates a useful helper class with
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static methods for use with the enum.
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*/
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#define ENUM(name, type, values...) \
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enum class name : type { values }; \
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class name##Helper { \
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inline static uint32_t constexpr ConstHash(char const* input) { \
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return *input ? static_cast<uint32_t>(*input) + 33 * ConstHash(input + 1) : 5381; \
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} \
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inline static constexpr char charToLower(const char c) { \
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return (c >= 'A' && c <= 'Z') ? c + ('a' - 'A') : c; \
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} \
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inline static uint32_t constexpr ConstHashCI(char const* input) { \
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return charToLower(*input) ? static_cast<uint32_t>(charToLower(*input)) + 33 * ConstHashCI(input + 1) \
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: 5381; \
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} \
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\
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public: \
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constexpr static const char* ToString(name value) { \
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switch (value) { FOR_EACH(ENUM_CASE, name, values) } \
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throw std::logic_error("Not reachable"); \
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} \
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constexpr static name Parse(const char* input, bool caseInsensitive = false) { \
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if (caseInsensitive) \
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return ParseCaseInsensitive(input); \
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switch (ConstHash(input)) { FOR_EACH(ENUM_PARSE_CASE, name, values) } \
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throw std::runtime_error("Invalid " #name " string."); \
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} \
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constexpr static bool TryParse(const char* input, name& out, bool caseInsensitive = false) { \
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if (caseInsensitive) \
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return TryParseCaseInsensitive(input, out); \
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switch (ConstHash(input)) { FOR_EACH(ENUM_TRY_PARSE_CASE, name, values) } \
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return false; \
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} \
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static std::vector<name> GetValues() { return {FOR_EACH(ARRAY_NAME, name, values)}; } \
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\
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private: \
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static name ParseCaseInsensitive(const char* input) { \
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switch (ConstHashCI(input)) { FOR_EACH(ENUM_PARSE_CASE_INSENSITIVE, name, values) } \
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throw std::runtime_error("Invalid " #name " string."); \
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} \
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static bool TryParseCaseInsensitive(const char* input, name& out) { \
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switch (ConstHashCI(input)) { FOR_EACH(ENUM_TRY_PARSE_CASE_INSENSITIVE, name, values) } \
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return false; \
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} \
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};
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