rpcs3/Utilities/config_context.h

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#pragma once
#include <unordered_map>
#include <string>
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#include "convert.h"
class config_context_t
{
public:
class entry_base;
protected:
class group
{
group* m_parent;
config_context_t* m_cfg;
std::string m_name;
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std::vector<std::unique_ptr<entry_base>> m_entries;
void init();
public:
std::unordered_map<std::string, entry_base *> entries;
group(config_context_t* cfg, const std::string& name);
group(group* parent, const std::string& name);
void set_parent(config_context_t* cfg);
std::string name() const;
std::string full_name() const;
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template<typename T>
void add_entry(const std::string& name, const T& def_value)
{
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m_entries.emplace_back(std::make_unique<entry<T>>(this, name, def_value));
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}
template<typename T>
T get_entry_value(const std::string& name, const T& def_value)
{
if (!entries[name])
add_entry(name, def_value);
return convert::to<T>(entries[name]->string_value());
}
template<typename T>
void set_entry_value(const std::string& name, const T& value)
{
if (entries[name])
entries[name]->string_value(convert::to<std::string>(value));
else
add_entry(name, value);
}
friend config_context_t;
};
public:
class entry_base
{
public:
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virtual ~entry_base() = default;
virtual std::string name() = 0;
virtual void to_default() = 0;
virtual std::string string_value() = 0;
virtual void string_value(const std::string& value) = 0;
virtual void value_from(const entry_base* rhs) = 0;
};
template<typename T>
class entry : public entry_base
{
T m_default_value;
T m_value;
group* m_parent;
std::string m_name;
public:
entry(group* parent, const std::string& name, const T& default_value)
: m_parent(parent)
, m_name(name)
, m_default_value(default_value)
, m_value(default_value)
{
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if(!parent->entries[name])
parent->entries[name] = this;
}
T default_value() const
{
return m_default_value;
}
T value() const
{
return m_value;
}
void value(const T& new_value)
{
m_value = new_value;
}
std::string name() override
{
return m_name;
}
void to_default() override
{
value(default_value());
}
std::string string_value() override
{
return convert::to<std::string>(value());
}
void string_value(const std::string &new_value) override
{
value(convert::to<T>(new_value));
}
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void value_from(const entry_base* rhs) override
{
value(static_cast<const entry*>(rhs)->value());
}
entry& operator = (const T& new_value)
{
value(new_value);
return *this;
}
template<typename T2>
entry& operator = (const T2& new_value)
{
value(static_cast<T>(new_value));
return *this;
}
explicit operator const T&() const
{
return m_value;
}
};
private:
std::unordered_map<std::string, group*> m_groups;
public:
config_context_t() = default;
void assign(const config_context_t& rhs);
void serialize(std::ostream& stream) const;
void deserialize(std::istream& stream);
void set_defaults();
std::string to_string() const;
void from_string(const std::string&);
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};