106 lines
9.3 KiB
C++
106 lines
9.3 KiB
C++
#include <vector>
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#include "MacroUtils.hpp"
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#include "StringView.hpp"
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#define ENUM_VALUE(x, value) x = value,
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#
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#define ENUM_CASE(x, name) \
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case name::x: \
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return ArbUt::StringViewLiteral(#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 ENUM_GET_HIGHEST(x, name) \
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if ((int64_t)name::x > highest) { \
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highest = (int64_t)name::x; \
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}
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#
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#define ENUM_GET_LOWEST(x, name) \
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if ((int64_t)name::x < lowest) { \
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lowest = (int64_t)name::x; \
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}
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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_WITH_START_VALUE(name, type, startValue, values...) \
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enum class name : type { \
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MACRO_UTILS_FOR_EACH_WITH_VALUE(ENUM_VALUE, startValue + ___MACRO_UTILS_NARGS(values) - 1, values) \
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}; \
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class name##Helper { \
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inline static uint32_t constexpr ConstHash(char const* input) noexcept { \
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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) noexcept { \
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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) noexcept { \
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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 ArbUt::StringViewLiteral ToString(name value) noexcept { \
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switch (value) { MACRO_UTILS_FOR_EACH(ENUM_CASE, name, values) } \
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return "out of bounds"_cnc; \
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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)) { MACRO_UTILS_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) noexcept { \
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if (caseInsensitive) \
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return TryParseCaseInsensitive(input, out); \
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switch (ConstHash(input)) { MACRO_UTILS_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() noexcept { return {MACRO_UTILS_FOR_EACH(ARRAY_NAME, name, values)}; } \
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constexpr static name Last() noexcept { return name::MACRO_UTILS_GET_LAST(values); } \
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constexpr static name First() noexcept { return name::MACRO_UTILS_GET_FIRST(values); } \
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constexpr static name Highest() noexcept { \
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int64_t highest = -9223372036854775807; \
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MACRO_UTILS_FOR_EACH(ENUM_GET_HIGHEST, name, values) \
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return (name)highest; \
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} \
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constexpr static name Lowest() noexcept { \
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int64_t lowest = 9223372036854775807; \
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MACRO_UTILS_FOR_EACH(ENUM_GET_LOWEST, name, values) \
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return (name)lowest; \
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} \
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\
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private: \
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constexpr static name ParseCaseInsensitive(const char* input) { \
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switch (ConstHashCI(input)) { MACRO_UTILS_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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constexpr static bool TryParseCaseInsensitive(const char* input, name& out) noexcept { \
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switch (ConstHashCI(input)) { MACRO_UTILS_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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#define ENUM(name, type, values...) ENUM_WITH_START_VALUE(name, type, 0, values);
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