expressionserializer.h
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Created: Thu, Jul 9, 6:55 AM

expressionserializer.h
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	/* This Source Code Form is subject to the terms of the Mozilla Public
	* License, v. 2.0. If a copy of the MPL was not distributed with this
	* file, You can obtain one at http://mozilla.org/MPL/2.0/.
	*
	* expressionserializer.h
	*
	* Created on: Jan 4, 2016
	* Author: pgess <v.melnychenko@xreate.org>
	*/

	#ifndef SRC_EXPRESSIONSERIALIZER_H_
	#define SRC_EXPRESSIONSERIALIZER_H_

	#include "ast.h"
	#include <string>
	#include <boost/optional.hpp>
	#include <boost/version.hpp>

	namespace xreate {

	struct PackedExpression{
	PackedExpression(){};
	PackedExpression(PackedExpression&& other);

	#if BOOST_VERSION <= 105500
	PackedExpression (const PackedExpression&);

	#else
	PackedExpression (const PackedExpression&)=delete;
	#endif

	~PackedExpression();
	void operator<< (const std::pair<size_t, size_t>& value);
	char* operator*(){return __storage;}
	bool operator==(const PackedExpression& other) const;
	bool operator!=(const PackedExpression& other) const;
	bool operator<(const PackedExpression& other) const;
	private:
	PackedExpression& operator=(const PackedExpression&)=delete;
	PackedExpression& operator=(PackedExpression&&)=delete;

	char* __storage = nullptr;
	size_t size =0;
	unsigned char countRemainedBits =0;
	};
	typedef boost::optional<PackedExpression> OptionalPackedExpression;

	class ExpressionSerializerPrivate;

	class ExpressionSerializer {
	public:
	template<class Container>
	ExpressionSerializer(const Container& source): ExpressionSerializer(){
	for (const Expression& e: source) {
	registerExpression(e);
	}
	}

	template<class Container, class Transformer>
	ExpressionSerializer(const Container& source, Transformer op): ExpressionSerializer(){
	for (const typename Container::value_type& e: source) {
	registerExpression(op(e));
	}
	}

	ExpressionSerializer(ExpressionSerializer&& other)
	: strategy(other.strategy) {other.strategy = 0; }

	virtual ~ExpressionSerializer();

	PackedExpression getId(const Expression& e);
	OptionalPackedExpression getIdOptional(const Expression& e) const;

	private:
	ExpressionSerializerPrivate* strategy;

	void registerExpression(const Expression&e);
	ExpressionSerializer();
	};

	class ExpressionSerializerIntegral: private std::vector<Expression>{
	typedef std::vector<Expression> PARENT;

	public:
	ExpressionSerializerIntegral();
	ExpressionSerializerIntegral(const std::vector<Expression>&& expressions);

	template<class Iterator>
	ExpressionSerializerIntegral(Iterator first, Iterator last)
	: ExpressionSerializerIntegral(std::vector<Expression>(first, last)){}

	ExpressionSerializerIntegral(ExpressionSerializerIntegral&& other)
	: PARENT(std::move(other)), __registry(std::move(other.__registry)), serializer(std::move(other.serializer)){}

	size_t getId(const Expression& e) const;
	boost::optional<size_t> getIdOptional(const Expression& e) const;
	const Expression& get(size_t id) const;
	size_t size() const;
	size_t count(const Expression& e) const;
	ExpressionSerializerIntegral::const_iterator begin() const;
	ExpressionSerializerIntegral::const_iterator end() const;

	private:
	ExpressionSerializerIntegral(const ExpressionSerializerIntegral&)=delete;

	std::map<PackedExpression, size_t> __registry;
	ExpressionSerializer serializer;
	};



	} /* namespace xreate */

	#endif /* SRC_EXPRESSIONSERIALIZER_H_ */

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