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#ifndef option_manager_hh_INCLUDED
#define option_manager_hh_INCLUDED
#include "completion.hh"
#include "exception.hh"
#include "flags.hh"
#include "option_types.hh"
#include "utils.hh"
#include "regex.hh"
#include <unordered_map>
namespace Kakoune
{
struct option_not_found : public runtime_error
{
option_not_found(StringView name)
: runtime_error("option not found: " + name) {}
};
class OptionManager;
enum class OptionFlags
{
None = 0,
Hidden = 1,
};
template<> struct WithBitOps<OptionFlags> : std::true_type {};
class OptionDesc
{
public:
OptionDesc(String name, String docstring, OptionFlags flags);
const String& name() const { return m_name; }
const String& docstring() const { return m_docstring; }
OptionFlags flags() const { return m_flags; }
private:
String m_name;
String m_docstring;
OptionFlags m_flags;
};
class Option
{
public:
virtual ~Option() = default;
template<typename T> const T& get() const;
template<typename T> void set(const T& val);
template<typename T> bool is_of_type() const;
virtual String get_as_string() const = 0;
virtual void set_from_string(StringView str) = 0;
virtual void add_from_string(StringView str) = 0;
virtual Option* clone(OptionManager& manager) const = 0;
OptionManager& manager() const { return m_manager; }
const String& name() const { return m_desc.name(); }
const String& docstring() const { return m_desc.docstring(); }
OptionFlags flags() const { return m_desc.flags(); }
protected:
Option(const OptionDesc& desc, OptionManager& manager);
OptionManager& m_manager;
const OptionDesc& m_desc;
};
class OptionManagerWatcher
{
public:
virtual ~OptionManagerWatcher() {}
virtual void on_option_changed(const Option& option) = 0;
};
class OptionManager : private OptionManagerWatcher
{
public:
OptionManager(OptionManager& parent);
~OptionManager();
Option& operator[] (StringView name);
const Option& operator[] (StringView name) const;
Option& get_local_option(StringView name);
CandidateList complete_option_name(StringView 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 Scope;
friend class OptionsRegistry;
template<typename MatchingFunc>
CandidateList get_matching_names(MatchingFunc func);
std::vector<std::unique_ptr<Option>> m_options;
OptionManager* m_parent;
std::vector<OptionManagerWatcher*> m_watchers;
};
template<typename T>
class TypedOption : public Option
{
public:
TypedOption(OptionManager& manager, const OptionDesc& desc, const T& value)
: Option(desc, manager), m_value(value) {}
void set(T value)
{
if (m_value != value)
{
m_value = std::move(value);
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(StringView str) override
{
T val;
option_from_string(str, val);
set(std::move(val));
}
void add_from_string(StringView str) override
{
T val;
option_from_string(str, val);
if (option_add(m_value, val))
m_manager.on_option_changed(*this);
}
Option* clone(OptionManager& manager) const override
{
return new TypedOption{manager, m_desc, 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> bool Option::is_of_type() const
{
return dynamic_cast<const TypedOption<T>*>(this) != nullptr;
}
template<typename T>
auto find_option(T& container, StringView name) -> decltype(container.begin())
{
using ptr_type = decltype(*container.begin());
return find_if(container, [&name](const ptr_type& opt) { return opt->name() == name; });
}
class OptionsRegistry
{
public:
OptionsRegistry(OptionManager& global_manager) : m_global_manager(global_manager) {}
template<typename T>
Option& declare_option(const String& name, const String& docstring,
const T& value,
OptionFlags flags = OptionFlags::None)
{
auto& opts = m_global_manager.m_options;
auto it = find_option(opts, name);
if (it != opts.end())
{
if ((*it)->is_of_type<T>() and (*it)->flags() == flags)
return **it;
throw runtime_error("option " + name + " already declared with different type or flags");
}
m_descs.emplace_back(new OptionDesc{name, docstring, flags});
opts.emplace_back(new TypedOption<T>{m_global_manager, *m_descs.back(), value});
return *opts.back();
}
bool option_exists(StringView name) const
{
return find_if(m_descs, [&name](const std::unique_ptr<OptionDesc>& opt) {
return opt->name() == name;
}) != m_descs.end();
}
private:
OptionManager& m_global_manager;
std::vector<std::unique_ptr<OptionDesc>> m_descs;
};
}
#endif // option_manager_hh_INCLUDED
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