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This also will hopefully deal with GCC's slightly confused claim that 'value' may be used without having been initialised down at #define OutputIntC (i.e. after it's out of scope, but I can sort of see why GCC might get confused while it remains in scope).
191 lines
4.9 KiB
C++
191 lines
4.9 KiB
C++
//
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// Struct.cpp
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// Clock Signal
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//
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// Created by Thomas Harte on 13/03/2020.
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// Copyright © 2020 Thomas Harte. All rights reserved.
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//
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#include "Struct.hpp"
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#include <algorithm>
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#include <iomanip>
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#include <sstream>
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// MARK: - Setters
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template <> bool Reflection::set(Struct &target, const std::string &name, int value) {
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const auto target_type = target.type_of(name);
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if(!target_type) return false;
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// No need to convert an int or a registered enum.
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if(*target_type == typeid(int) || !Reflection::Enum::name(*target_type).empty()) {
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target.set(name, &value);
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return true;
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}
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// Promote to an int64_t.
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if(*target_type == typeid(int64_t)) {
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const auto int64 = int64_t(value);
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target.set(name, &int64);
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return true;
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}
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return false;
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}
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template <> bool Reflection::set(Struct &target, const std::string &name, const std::string &value) {
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const auto target_type = target.type_of(name);
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if(!target_type) return false;
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if(Reflection::Enum::name(*target_type).empty()) {
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return false;
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}
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const int enum_value = Reflection::Enum::from_string(*target_type, value);
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if(enum_value < 0) {
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return false;
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}
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target.set(name, &enum_value);
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return true;
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}
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template <> bool Reflection::set(Struct &target, const std::string &name, const char *value) {
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const std::string string(value);
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return set<const std::string &>(target, name, string);
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}
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template <> bool Reflection::set(Struct &target, const std::string &name, bool value) {
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const auto target_type = target.type_of(name);
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if(!target_type) return false;
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if(*target_type == typeid(bool)) {
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target.set(name, &value);;
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}
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return false;
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}
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// MARK: - Fuzzy setter
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bool Reflection::fuzzy_set(Struct &target, const std::string &name, const std::string &value) {
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const auto target_type = target.type_of(name);
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if(!target_type) return false;
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// If the target is a registered enum, ttry to convert the value. Failing that,
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// try to match without case sensitivity.
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if(Reflection::Enum::size(*target_type)) {
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const int from_string = Reflection::Enum::from_string(*target_type, value);
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if(from_string >= 0) {
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target.set(name, &from_string);
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return true;
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}
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const auto all_values = Reflection::Enum::all_values(*target_type);
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const auto value_location = std::find_if(all_values.begin(), all_values.end(),
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[&value] (const auto &entry) {
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if(value.size() != entry.size()) return false;
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const char *v = value.c_str();
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const char *e = entry.c_str();
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while(*v) {
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if(tolower(*v) != tolower(*e)) return false;
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++v;
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++e;
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}
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return true;
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});
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if(value_location != all_values.end()) {
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const int offset = int(value_location - all_values.begin());
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target.set(name, &offset);
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return true;
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}
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return false;
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}
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return false;
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}
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// MARK: - Getters
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template <typename Type> bool Reflection::get(const Struct &target, const std::string &name, Type &value) {
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const auto target_type = target.type_of(name);
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if(!target_type) return false;
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if(*target_type == typeid(Type)) {
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memcpy(&value, target.get(name), sizeof(Type));
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return true;
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}
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return false;
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}
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template <typename Type> Type Reflection::get(const Struct &target, const std::string &name) {
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Type value;
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get(target, name, value);
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return value;
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}
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// MARK: - Description
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std::string Reflection::Struct::description() const {
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std::ostringstream stream;
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stream << "{";
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bool is_first = true;
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for(const auto &key: all_keys()) {
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if(!is_first) stream << ", ";
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is_first = false;
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stream << key << ": ";
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const auto type = type_of(key);
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// Output Bools as yes/no.
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if(*type == typeid(bool)) {
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stream << ::Reflection::get<bool>(*this, key);
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continue;
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}
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// Output Ints of all sizes as hex.
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#define OutputIntC(int_type, cast_type) if(*type == typeid(int_type)) { stream << std::setfill('0') << std::setw(sizeof(int_type)*2) << std::hex << cast_type(::Reflection::get<int_type>(*this, key)); continue; }
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#define OutputInt(int_type) OutputIntC(int_type, int_type)
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OutputIntC(int8_t, int16_t);
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OutputIntC(uint8_t, uint16_t);
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OutputInt(int16_t);
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OutputInt(uint16_t);
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OutputInt(int32_t);
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OutputInt(uint32_t);
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OutputInt(int64_t);
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OutputInt(uint64_t);
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#undef OutputInt
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// Output floats and strings natively.
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#define OutputNative(val_type) if(*type == typeid(val_type)) { stream << ::Reflection::get<val_type>(*this, key); continue; }
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OutputNative(float);
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OutputNative(double);
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OutputNative(char *);
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OutputNative(std::string);
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#undef OutputNAtive
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// Output the current value of any enums.
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if(!Enum::name(*type).empty()) {
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const int value = ::Reflection::get<int>(*this, key);
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stream << Enum::to_string(*type, value);
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continue;
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}
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// Recurse to deal with embedded objects.
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if(*type == typeid(Reflection::Struct)) {
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const Reflection::Struct *const child = reinterpret_cast<const Reflection::Struct *>(get(key));
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stream << child->description();
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continue;
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}
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}
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stream << "}";
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return stream.str();
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}
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