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/*
* Copyright (C) 2005-2018 Team Kodi
* This file is part of Kodi - https://kodi.tv
*
* SPDX-License-Identifier: GPL-2.0-or-later
* See LICENSES/README.md for more information.
*/
#pragma once
#include "InfoBool.h"
#include <list>
#include <stack>
#include <utility>
#include <vector>
class CGUIListItem;
namespace INFO
{
/*! \brief Class to wrap active boolean conditions
*/
class InfoSingle : public InfoBool
{
public:
InfoSingle(const std::string& expression, int context, unsigned int& refreshCounter)
: InfoBool(expression, context, refreshCounter)
{
}
void Initialize() override;
void Update(int contextWindow, const CGUIListItem* item) override;
private:
int m_condition; ///< actual condition this represents
};
/*! \brief Class to wrap active boolean expressions
*/
class InfoExpression : public InfoBool
{
public:
InfoExpression(const std::string& expression, int context, unsigned int& refreshCounter)
: InfoBool(expression, context, refreshCounter)
{
}
~InfoExpression() override = default;
void Initialize() override;
void Update(int contextWindow, const CGUIListItem* item) override;
private:
typedef enum
{
OPERATOR_NONE = 0,
OPERATOR_LB, // 1
OPERATOR_RB, // 2
OPERATOR_OR, // 3
OPERATOR_AND, // 4
OPERATOR_NOT, // 5
} operator_t;
typedef enum
{
NODE_LEAF,
NODE_AND,
NODE_OR,
} node_type_t;
// An abstract base class for nodes in the expression tree
class InfoSubexpression
{
public:
virtual ~InfoSubexpression(void) = default; // so we can destruct derived classes using a pointer to their base class
virtual bool Evaluate(int contextWindow, const CGUIListItem* item) = 0;
virtual node_type_t Type() const=0;
};
typedef std::shared_ptr<InfoSubexpression> InfoSubexpressionPtr;
// A leaf node in the expression tree
class InfoLeaf : public InfoSubexpression
{
public:
InfoLeaf(InfoPtr info, bool invert) : m_info(std::move(info)), m_invert(invert) {}
bool Evaluate(int contextWindow, const CGUIListItem* item) override;
node_type_t Type() const override { return NODE_LEAF; }
private:
InfoPtr m_info;
bool m_invert;
};
// A branch node in the expression tree
class InfoAssociativeGroup : public InfoSubexpression
{
public:
InfoAssociativeGroup(node_type_t type, const InfoSubexpressionPtr &left, const InfoSubexpressionPtr &right);
void AddChild(const InfoSubexpressionPtr &child);
void Merge(const std::shared_ptr<InfoAssociativeGroup>& other);
bool Evaluate(int contextWindow, const CGUIListItem* item) override;
node_type_t Type() const override { return m_type; }
private:
node_type_t m_type;
std::list<InfoSubexpressionPtr> m_children;
};
static operator_t GetOperator(char ch);
static void OperatorPop(std::stack<operator_t> &operator_stack, bool &invert, std::stack<InfoSubexpressionPtr> &nodes);
bool Parse(const std::string &expression);
InfoSubexpressionPtr m_expression_tree;
};
};
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