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123 lines
3.8 KiB
C++
123 lines
3.8 KiB
C++
/*
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Minetest
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Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#pragma once
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#include "irr_v3d.h"
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#include <iostream>
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#include <vector>
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#include "util/string.h"
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// Basic metadata interface
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class IMetadata
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{
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public:
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virtual ~IMetadata() = default;
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virtual void clear() = 0;
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bool operator==(const IMetadata &other) const;
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inline bool operator!=(const IMetadata &other) const
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{
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return !(*this == other);
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}
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//
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// Key-value related
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//
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virtual bool contains(const std::string &name) const = 0;
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// May (not must!) put a string in `place` and return a reference to that string.
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const std::string &getString(const std::string &name, std::string *place,
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u16 recursion = 0) const;
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// If the entry is present, puts the value in str and returns true;
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// otherwise just returns false.
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bool getStringToRef(const std::string &name, std::string &str, u16 recursion = 0) const;
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// Returns whether the metadata was (potentially) changed.
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virtual bool setString(const std::string &name, std::string_view var) = 0;
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inline bool removeString(const std::string &name) { return setString(name, ""); }
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// May (not must!) put strings in `place` and return a reference to these strings.
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virtual const StringMap &getStrings(StringMap *place) const = 0;
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// May (not must!) put keys in `place` and return a reference to these keys.
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virtual const std::vector<std::string> &getKeys(std::vector<std::string> *place) const = 0;
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// Add support for variable names in values. Uses place like getString.
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const std::string &resolveString(const std::string &str, std::string *place,
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u16 recursion = 0, bool deprecated = false) const;
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protected:
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// Returns nullptr to indicate absence of value. Uses place like getString.
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virtual const std::string *getStringRaw(const std::string &name,
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std::string *place) const = 0;
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};
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// Simple metadata parent class (in-memory storage)
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class SimpleMetadata: public virtual IMetadata
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{
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bool m_modified = false;
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public:
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virtual ~SimpleMetadata() = default;
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virtual void clear() override;
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virtual bool empty() const;
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//
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// Key-value related
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//
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size_t size() const;
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bool contains(const std::string &name) const override;
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virtual bool setString(const std::string &name, std::string_view var) override;
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const StringMap &getStrings(StringMap *) const override final;
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const std::vector<std::string> &getKeys(std::vector<std::string> *place)
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const override final;
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// Simple version of getters, possible due to in-memory storage:
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inline const std::string &getString(const std::string &name, u16 recursion = 0) const
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{
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return IMetadata::getString(name, nullptr, recursion);
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}
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inline const std::string &resolveString(const std::string &str, u16 recursion = 0) const
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{
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return IMetadata::resolveString(str, nullptr, recursion);
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}
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inline const StringMap &getStrings() const
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{
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return SimpleMetadata::getStrings(nullptr);
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}
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inline bool isModified() const { return m_modified; }
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inline void setModified(bool v) { m_modified = v; }
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protected:
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StringMap m_stringvars;
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const std::string *getStringRaw(const std::string &name,
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std::string *) const override final;
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};
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