node.h

#pragma once

#include "date.h"
#include <memory>
#include <string>
#include <sstream>

enum class Comparison {
	Less,
	LessOrEqual,
	Greater,
	GreaterOrEqual,
	Equal,
	NotEqual,
};

enum class LogicalOperation {
	And,
	Or,
};

class Node {
public:
	virtual bool Evaluate(const Date& date, const string& event) const = 0;	
};

class EmptyNode : public Node {
public:	
	bool Evaluate (const Date& date, const string& event) const override;
};

class LogicalOperationNode : public Node {
public:
	LogicalOperationNode(const LogicalOperation logical_operation,
		shared_ptr<Node> left, shared_ptr<Node> right) 
		: logical_operation_(logical_operation), left_(left), right_(right) {}	
	bool Evaluate (const Date& date, const string& event) const override;
	
	const LogicalOperation logical_operation_;
	shared_ptr<const Node> left_, right_;
};

class DateComparisonNode : public Node {
public:	
	DateComparisonNode(const Comparison& cmp, const Date& date)
		: cmp_(cmp), date_(date) {}
	bool Evaluate (const Date& date, const string& event) const override;
	
	const Comparison cmp_;
	const Date date_;
};

class EventComparisonNode : public Node {
public:
	EventComparisonNode(const Comparison& cmp, const string& event) 
		: cmp_(cmp), event_(event) {}
	bool Evaluate (const Date& date, const string& event) const override;
		
	const Comparison cmp_;
	const string event_;
};

void TestFind(const string s1, const string s2);