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kakoune/src/option_manager.cc

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#include "option_manager.hh"
#include "assert.hh"
#include <sstream>
namespace Kakoune
{
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;
void set_from_string(const String& str) override;
Option* clone(OptionManager& manager) const override
{
return new TypedOption{manager, name(), m_value};
}
private:
T m_value;
};
Option::Option(OptionManager& manager, String name)
: m_manager(manager), m_name(std::move(name)) {}
template<typename T> const T& Option::get() const { return dynamic_cast<const TypedOption<T>*>(this)->get(); }
template<typename T> void Option::set(const T& val) { return dynamic_cast<TypedOption<T>*>(this)->set(val); }
// TypedOption<String> specializations;
template<> String TypedOption<String>::get_as_string() const { return m_value; }
template<> void TypedOption<String>::set_from_string(const String& str) { set(str); }
template class TypedOption<String>;
template const String& Option::get<String>() const;
template void Option::set<String>(const String&);
// TypedOption<int> specializations;
template<> String TypedOption<int>::get_as_string() const { return int_to_str(m_value); }
template<> void TypedOption<int>::set_from_string(const String& str) { set(str_to_int(str)); }
template class TypedOption<int>;
template const int& Option::get<int>() const;
template void Option::set<int>(const int&);
OptionManager::OptionManager(OptionManager& parent)
: m_parent(&parent)
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{
parent.register_watcher(*this);
}
OptionManager::~OptionManager()
{
if (m_parent)
m_parent->unregister_watcher(*this);
assert(m_watchers.empty());
}
void OptionManager::register_watcher(OptionManagerWatcher& watcher)
{
assert(not contains(m_watchers, &watcher));
m_watchers.push_back(&watcher);
}
void OptionManager::unregister_watcher(OptionManagerWatcher& watcher)
{
auto it = find(m_watchers.begin(), m_watchers.end(), &watcher);
assert(it != m_watchers.end());
m_watchers.erase(it);
}
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; });
}
Option& OptionManager::get_local_option(const String& name)
{
auto it = find_option(m_options, name);
if (it != m_options.end())
return **it;
else if (m_parent)
{
m_options.emplace_back((*m_parent)[name].clone(*this));
return *m_options.back();
}
else
throw option_not_found(name);
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}
const Option& OptionManager::operator[](const String& name) const
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{
auto it = find_option(m_options, name);
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if (it != m_options.end())
return **it;
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else if (m_parent)
return (*m_parent)[name];
else
throw option_not_found(name);
}
CandidateList OptionManager::complete_option_name(const String& prefix,
ByteCount cursor_pos)
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{
String real_prefix = prefix.substr(0, cursor_pos);
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CandidateList result;
if (m_parent)
result = m_parent->complete_option_name(prefix, cursor_pos);
for (auto& option : m_options)
{
const auto& name = option->name();
if (name.substr(0, real_prefix.length()) == real_prefix and
not contains(result, name))
result.push_back(name);
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}
return result;
}
OptionManager::OptionList OptionManager::flatten_options() const
{
OptionList res = m_parent ? m_parent->flatten_options() : OptionList{};
for (auto& option : m_options)
{
auto it = find_option(res, option->name());
if (it != res.end())
*it = option.get();
else
res.emplace_back(option.get());
}
return res;
}
void OptionManager::on_option_changed(const Option& option)
{
// if parent option changed, but we overrided it, it's like nothing happened
if (&option.manager() != this and
find_option(m_options, option.name()) != m_options.end())
return;
for (auto watcher : m_watchers)
watcher->on_option_changed(option);
}
GlobalOptions::GlobalOptions()
: OptionManager()
{
declare_option<int>("tabstop", 8);
declare_option<int>("indentwidth", 4);
declare_option<String>("eolformat", "lf");
declare_option<String>("BOM", "no");
declare_option<String>("shell", "sh");
declare_option<int>("complete_prefix", 1);
declare_option<int>("incsearch", 1);
declare_option<String>("ignored_files", R"(^(\..*|.*\.(o|so|a)))$)");
declare_option<String>("filetype", "");
}
template<typename T>
Option& GlobalOptions::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();
}
}