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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* 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/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
#include <expressionnodefactory.hxx>
#include <algorithm>
/* Implementation of ExpressionNodeFactory class */
namespace slideshow::internal
{
namespace
{
class ConstantValueExpression : public ExpressionNode
{
public:
explicit ConstantValueExpression( double rValue ) :
maValue( rValue )
{
}
virtual double operator()( double /*t*/ ) const override
{
return maValue;
}
virtual bool isConstant() const override
{
return true;
}
private:
double maValue;
};
class TValueExpression : public ExpressionNode
{
public:
TValueExpression()
{
}
virtual double operator()( double t ) const override
{
return t;
}
virtual bool isConstant() const override
{
return false;
}
};
/** Base class for following binary functions (*+-/)
Does not pay off to have all this as a template, since
we'd have to hold the functor as a member (+33% object
size).
*/
class BinaryExpressionBase : public ExpressionNode
{
public:
BinaryExpressionBase( const std::shared_ptr<ExpressionNode>& rFirstArg,
const std::shared_ptr<ExpressionNode>& rSecondArg ) :
mpFirstArg( rFirstArg ),
mpSecondArg( rSecondArg )
{
}
virtual bool isConstant() const override
{
return
mpFirstArg->isConstant() &&
mpSecondArg->isConstant();
}
protected:
std::shared_ptr<ExpressionNode> mpFirstArg;
std::shared_ptr<ExpressionNode> mpSecondArg;
};
class PlusExpression : public BinaryExpressionBase
{
public:
PlusExpression( const std::shared_ptr<ExpressionNode>& rFirstArg,
const std::shared_ptr<ExpressionNode>& rSecondArg ) :
BinaryExpressionBase( rFirstArg, rSecondArg )
{
}
virtual double operator()( double t ) const override
{
return (*mpFirstArg)(t) + (*mpSecondArg)(t);
}
};
class MinusExpression : public BinaryExpressionBase
{
public:
MinusExpression( const std::shared_ptr<ExpressionNode>& rFirstArg,
const std::shared_ptr<ExpressionNode>& rSecondArg ) :
BinaryExpressionBase( rFirstArg, rSecondArg )
{
}
virtual double operator()( double t ) const override
{
return (*mpFirstArg)(t) - (*mpSecondArg)(t);
}
};
class MultipliesExpression : public BinaryExpressionBase
{
public:
MultipliesExpression( const std::shared_ptr<ExpressionNode>& rFirstArg,
const std::shared_ptr<ExpressionNode>& rSecondArg ) :
BinaryExpressionBase( rFirstArg, rSecondArg )
{
}
virtual double operator()( double t ) const override
{
return (*mpFirstArg)(t) * (*mpSecondArg)(t);
}
};
class DividesExpression : public BinaryExpressionBase
{
public:
DividesExpression( const std::shared_ptr<ExpressionNode>& rFirstArg,
const std::shared_ptr<ExpressionNode>& rSecondArg ) :
BinaryExpressionBase( rFirstArg, rSecondArg )
{
}
virtual double operator()( double t ) const override
{
return (*mpFirstArg)(t) / (*mpSecondArg)(t);
}
};
class MinExpression : public BinaryExpressionBase
{
public:
MinExpression( const std::shared_ptr<ExpressionNode>& rFirstArg,
const std::shared_ptr<ExpressionNode>& rSecondArg ) :
BinaryExpressionBase( rFirstArg, rSecondArg )
{
}
virtual double operator()( double t ) const override
{
return ::std::min( (*mpFirstArg)(t), (*mpSecondArg)(t) );
}
};
class MaxExpression : public BinaryExpressionBase
{
public:
MaxExpression( const std::shared_ptr<ExpressionNode>& rFirstArg,
const std::shared_ptr<ExpressionNode>& rSecondArg ) :
BinaryExpressionBase( rFirstArg, rSecondArg )
{
}
virtual double operator()( double t ) const override
{
return ::std::max( (*mpFirstArg)(t), (*mpSecondArg)(t) );
}
};
}
std::shared_ptr<ExpressionNode> ExpressionNodeFactory::createConstantValueExpression( double rConstantValue )
{
return std::make_shared<ConstantValueExpression>(rConstantValue);
}
std::shared_ptr<ExpressionNode> ExpressionNodeFactory::createValueTExpression()
{
return std::make_shared<TValueExpression>();
}
std::shared_ptr<ExpressionNode> ExpressionNodeFactory::createPlusExpression( const std::shared_ptr<ExpressionNode>& rLHS,
const std::shared_ptr<ExpressionNode>& rRHS )
{
return std::make_shared<PlusExpression>(rLHS, rRHS);
}
std::shared_ptr<ExpressionNode> ExpressionNodeFactory::createMinusExpression( const std::shared_ptr<ExpressionNode>& rLHS,
const std::shared_ptr<ExpressionNode>& rRHS )
{
return std::make_shared<MinusExpression>(rLHS, rRHS);
}
std::shared_ptr<ExpressionNode> ExpressionNodeFactory::createMultipliesExpression( const std::shared_ptr<ExpressionNode>& rLHS,
const std::shared_ptr<ExpressionNode>& rRHS )
{
return std::make_shared<MultipliesExpression>(rLHS, rRHS);
}
std::shared_ptr<ExpressionNode> ExpressionNodeFactory::createDividesExpression( const std::shared_ptr<ExpressionNode>& rLHS,
const std::shared_ptr<ExpressionNode>& rRHS )
{
return std::make_shared<DividesExpression>(rLHS, rRHS);
}
std::shared_ptr<ExpressionNode> ExpressionNodeFactory::createMinExpression ( const std::shared_ptr<ExpressionNode>& rOuterFunction,
const std::shared_ptr<ExpressionNode>& rInnerFunction )
{
return std::make_shared<MinExpression>(rOuterFunction, rInnerFunction);
}
std::shared_ptr<ExpressionNode> ExpressionNodeFactory::createMaxExpression ( const std::shared_ptr<ExpressionNode>& rOuterFunction,
const std::shared_ptr<ExpressionNode>& rInnerFunction )
{
return std::make_shared<MaxExpression>(rOuterFunction, rInnerFunction);
}
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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