kakoune/src/option_manager.hh

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#ifndef option_manager_hh_INCLUDED
#define option_manager_hh_INCLUDED
#include "utils.hh"
#include "exception.hh"
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#include "completion.hh"
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#include "option_types.hh"
#include <unordered_map>
namespace Kakoune
{
struct option_not_found : public runtime_error
{
option_not_found(const String& name)
: runtime_error("option not found: " + name) {}
};
class OptionManager;
class Option
{
public:
Option(OptionManager& manager, String name);
virtual ~Option() {}
template<typename T> const T& get() const;
template<typename T> void set(const T& val);
virtual String get_as_string() const = 0;
virtual void set_from_string(const String& str) = 0;
String name() const { return m_name; }
OptionManager& manager() const { return m_manager; }
virtual Option* clone(OptionManager& manager) const = 0;
protected:
OptionManager& m_manager;
String m_name;
};
class OptionManagerWatcher
{
public:
virtual ~OptionManagerWatcher() {}
virtual void on_option_changed(const Option& option) = 0;
};
class OptionManager : private OptionManagerWatcher
{
public:
OptionManager(OptionManager& parent);
~OptionManager();
const Option& operator[] (const String& name) const;
Option& get_local_option(const String& name);
CandidateList complete_option_name(const String& prefix,
ByteCount cursor_pos);
using OptionList = std::vector<const Option*>;
OptionList flatten_options() const;
void register_watcher(OptionManagerWatcher& watcher);
void unregister_watcher(OptionManagerWatcher& watcher);
void on_option_changed(const Option& option) override;
private:
OptionManager()
: m_parent(nullptr) {}
// the only one allowed to construct a root option manager
friend class GlobalOptions;
std::vector<std::unique_ptr<Option>> m_options;
OptionManager* m_parent;
std::vector<OptionManagerWatcher*> m_watchers;
};
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template<typename T>
class TypedOption : public Option
{
public:
TypedOption(OptionManager& manager, String name, const T& value)
: Option(manager, std::move(name)), m_value(value) {}
void set(const T& value)
{
if (m_value != value)
{
m_value = value;
m_manager.on_option_changed(*this);
}
}
const T& get() const { return m_value; }
String get_as_string() const override
{
return option_to_string(m_value);
}
void set_from_string(const String& str) override
{
T val;
option_from_string(str, val);
set(val);
}
Option* clone(OptionManager& manager) const override
{
return new TypedOption{manager, name(), m_value};
}
private:
T m_value;
};
template<typename T> const T& Option::get() const
{
auto* typed_opt = dynamic_cast<const TypedOption<T>*>(this);
if (not typed_opt)
throw runtime_error("option " + name() + " is not of type " + typeid(T).name());
return typed_opt->get();
}
template<typename T> void Option::set(const T& val)
{
auto* typed_opt = dynamic_cast<TypedOption<T>*>(this);
if (not typed_opt)
throw runtime_error("option " + name() + " is not of type " + typeid(T).name());
return typed_opt->set(val);
}
template<typename T>
auto find_option(T& container, const String& name) -> decltype(container.begin())
{
using ptr_type = decltype(*container.begin());
return find_if(container, [&name](const ptr_type& opt) { return opt->name() == name; });
}
class GlobalOptions : public OptionManager,
public Singleton<GlobalOptions>
{
public:
GlobalOptions();
template<typename T>
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Option& declare_option(const String& name, const T& value)
{
if (find_option(m_options, name) != m_options.end())
throw runtime_error("option " + name + " already declared");
m_options.emplace_back(new TypedOption<T>{*this, name, value});
return *m_options.back();
}
};
}
#endif // option_manager_hh_INCLUDED