[Complex Text Layouts] Implement TextServer interface. Implement Fallback TextServer.

core/templates/lru.h

@@ -0,0 +1,126 @@
+/*************************************************************************/
+/*  lru.h                                                                */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md).   */
+/*                                                                       */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the       */
+/* "Software"), to deal in the Software without restriction, including   */
+/* without limitation the rights to use, copy, modify, merge, publish,   */
+/* distribute, sublicense, and/or sell copies of the Software, and to    */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions:                                             */
+/*                                                                       */
+/* The above copyright notice and this permission notice shall be        */
+/* included in all copies or substantial portions of the Software.       */
+/*                                                                       */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
+/*************************************************************************/
+
+#ifndef LRU_H
+#define LRU_H
+
+#include "core/math/math_funcs.h"
+#include "hash_map.h"
+#include "list.h"
+
+template <class TKey, class TData>
+class LRUCache {
+private:
+	struct Pair {
+		TKey key;
+		TData data;
+
+		Pair() {}
+		Pair(const TKey &p_key, const TData &p_data) :
+				key(p_key),
+				data(p_data) {
+		}
+	};
+
+	typedef typename List<Pair>::Element *Element;
+
+	List<Pair> _list;
+	HashMap<TKey, Element> _map;
+	size_t capacity;
+
+public:
+	const TData *insert(const TKey &p_key, const TData &p_value) {
+		Element *e = _map.getptr(p_key);
+		Element n = _list.push_front(Pair(p_key, p_value));
+
+		if (e) {
+			_list.erase(*e);
+			_map.erase(p_key);
+		}
+		_map[p_key] = _list.front();
+
+		while (_map.size() > capacity) {
+			Element d = _list.back();
+			_map.erase(d->get().key);
+			_list.pop_back();
+		}
+
+		return &n->get().data;
+	}
+
+	void clear() {
+		_map.clear();
+		_list.clear();
+	}
+
+	bool has(const TKey &p_key) const {
+		return _map.getptr(p_key);
+	}
+
+	const TData &get(const TKey &p_key) {
+		Element *e = _map.getptr(p_key);
+		CRASH_COND(!e);
+		_list.move_to_front(*e);
+		return (*e)->get().data;
+	};
+
+	const TData *getptr(const TKey &p_key) {
+		Element *e = _map.getptr(p_key);
+		if (!e) {
+			return nullptr;
+		} else {
+			_list.move_to_front(*e);
+			return &(*e)->get().data;
+		}
+	}
+
+	_FORCE_INLINE_ size_t get_capacity() const { return capacity; }
+
+	void set_capacity(size_t p_capacity) {
+		if (capacity > 0) {
+			capacity = p_capacity;
+			while (_map.size() > capacity) {
+				Element d = _list.back();
+				_map.erase(d->get().key);
+				_list.pop_back();
+			}
+		}
+	}
+
+	LRUCache() {
+		capacity = 64;
+	}
+
+	LRUCache(int p_capacity) {
+		capacity = p_capacity;
+	}
+};
+
+#endif