76 lines
2.0 KiB
C++
76 lines
2.0 KiB
C++
#pragma once
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#include <qhash.h>
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#include <qobject.h>
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#include <qstringview.h>
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#include "node.hpp"
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namespace ZShell::settings {
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// Derived from Node and has ctor(path, fallback, parent)
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template <typename T>
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concept LayerType = std::derived_from<T, Node> && std::constructible_from<T, const QString&, T*, QObject*>;
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template <LayerType T> class LayerRegistry {
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public:
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explicit LayerRegistry(const QString& prefix, const QString& suffix, QObject* parent);
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[[nodiscard]] QString pathFor(const QString& name) const;
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[[nodiscard]] QString nameFor(T* layer) const;
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[[nodiscard]] T* get(const QString& name, T* fallback, bool* created = nullptr); // Created on demand
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private:
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const QString m_prefix;
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const QString m_suffix;
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QObject* const m_parent;
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QHash<QString, T*> m_layers;
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};
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namespace detail {
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inline QString stripTrailingSlashes(QStringView str) {
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while (str.endsWith(u'/'))
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str = str.left(str.length() - 1);
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return str.toString();
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}
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inline QString stripLeadingSlashes(QStringView str) {
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while (str.startsWith(u'/'))
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str = str.mid(1);
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return str.toString();
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}
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} // namespace detail
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template <LayerType T>
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LayerRegistry<T>::LayerRegistry(const QString& prefix, const QString& suffix, QObject* parent)
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: m_prefix(detail::stripTrailingSlashes(prefix))
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, m_suffix(detail::stripLeadingSlashes(suffix))
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, m_parent(parent) {}
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template <LayerType T> QString LayerRegistry<T>::pathFor(const QString& name) const {
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return m_prefix + u'/' + name + u'/' + m_suffix;
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}
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template <LayerType T> QString LayerRegistry<T>::nameFor(T* layer) const {
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return m_layers.key(layer);
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}
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template <LayerType T> T* LayerRegistry<T>::get(const QString& name, T* fallback, bool* created) {
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if (auto* const layer = m_layers.value(name)) {
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if (created)
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*created = false;
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return layer;
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}
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if (created)
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*created = true;
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auto* const layer = new T(pathFor(name), fallback, m_parent);
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m_layers.insert(name, layer);
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return layer;
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}
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} // namespace ZShell::settings
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