node_path.h

/**************************************************************************/
/*  node_path.h                                                           */
/**************************************************************************/
/*                         This file is part of:                          */
/*                             GODOT ENGINE                               */
/*                        https://godotengine.org                         */
/**************************************************************************/
/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
/*                                                                        */
/* 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.                 */
/**************************************************************************/

#pragma once

#include "core/string/string_name.h"
#include "core/string/ustring.h"

#include <climits>

class [[nodiscard]] NodePath {
	struct Data {
		SafeRefCount refcount;
		Vector<StringName> path;
		Vector<StringName> subpath;
		StringName concatenated_path;
		StringName concatenated_subpath;
		bool absolute;
		mutable bool hash_cache_valid;
		mutable uint32_t hash_cache;
	};

	mutable Data *data = nullptr;
	void unref();

	void _update_hash_cache() const;

public:
	bool is_absolute() const;
	int get_name_count() const;
	StringName get_name(int p_idx) const;
	int get_subname_count() const;
	StringName get_subname(int p_idx) const;
	int get_total_name_count() const;
	Vector<StringName> get_names() const;
	Vector<StringName> get_subnames() const;
	StringName get_concatenated_names() const;
	StringName get_concatenated_subnames() const;
	NodePath slice(int p_begin, int p_end = INT_MAX) const;

	NodePath rel_path_to(const NodePath &p_np) const;
	NodePath get_as_property_path() const;

	void prepend_period();

	_FORCE_INLINE_ uint32_t hash() const {
		if (!data) {
			return 0;
		}
		if (!data->hash_cache_valid) {
			_update_hash_cache();
		}
		return data->hash_cache;
	}

	explicit operator String() const;
	bool is_empty() const;

	bool operator==(const NodePath &p_path) const;
	bool operator!=(const NodePath &p_path) const;
	void operator=(const NodePath &p_path);

	void simplify();
	NodePath simplified() const;

	NodePath(const Vector<StringName> &p_path, bool p_absolute);
	NodePath(const Vector<StringName> &p_path, const Vector<StringName> &p_subpath, bool p_absolute);
	NodePath(const NodePath &p_path);
	NodePath(const String &p_path);
	NodePath() {}
	~NodePath();
};

// Zero-constructing NodePath initializes data to nullptr (and thus empty).
template <>
struct is_zero_constructible<NodePath> : std::true_type {};