SCA_ExpressionController.cpp

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/*
 * 'Expression Controller enables to calculate an expression that wires inputs to output
 *
 *
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 *
 * The Original Code is: all of this file.
 *
 * Contributor(s): none yet.
 *
 * ***** END GPL LICENSE BLOCK *****
 */

#include "SCA_ExpressionController.h"
#include "SCA_ISensor.h"
#include "SCA_LogicManager.h"
#include "BoolValue.h"
#include "InputParser.h"
#include "MT_Transform.h" // for fuzzyZero

#include <stdio.h>


/* ------------------------------------------------------------------------- */
/* Native functions                                                          */
/* ------------------------------------------------------------------------- */

SCA_ExpressionController::SCA_ExpressionController(SCA_IObject* gameobj,
                                                   const STR_String& exprtext)
    :SCA_IController(gameobj),
    m_exprText(exprtext),
    m_exprCache(NULL)
{
}



SCA_ExpressionController::~SCA_ExpressionController()
{
    if (m_exprCache)
        m_exprCache->Release();
}



CValue* SCA_ExpressionController::GetReplica()
{
    SCA_ExpressionController* replica = new SCA_ExpressionController(*this);
    replica->m_exprText = m_exprText;
    replica->m_exprCache = NULL;
    // this will copy properties and so on...
    replica->ProcessReplica();

    return replica;
}


// Forced deletion of precalculated expression to break reference loop
// Use this function when you know that you won't use the sensor anymore
void SCA_ExpressionController::Delete()
{
    if (m_exprCache)
    {
        m_exprCache->Release();
        m_exprCache = NULL;
    }
    Release();
}


void SCA_ExpressionController::Trigger(SCA_LogicManager* logicmgr)
{

    bool expressionresult = false;
    if (!m_exprCache)
    {
        CParser parser;
        parser.SetContext(this->AddRef());
        m_exprCache = parser.ProcessText(m_exprText);
    }
    if (m_exprCache)
    {
        CValue* value = m_exprCache->Calculate();
        if (value)
        {
            if (value->IsError())
            {
                printf("%s\n", value->GetText().ReadPtr());
            } else
            {
                float num = (float)value->GetNumber();
                expressionresult = !MT_fuzzyZero(num);
            }
            value->Release();

        }
    }

    for (vector<SCA_IActuator*>::const_iterator i=m_linkedactuators.begin();
    !(i==m_linkedactuators.end());i++)
    {
        SCA_IActuator* actua = *i;
        logicmgr->AddActiveActuator(actua,expressionresult);
    }
}



CValue* SCA_ExpressionController::FindIdentifier(const STR_String& identifiername)
{

    CValue* identifierval = NULL;

    for (vector<SCA_ISensor*>::const_iterator is=m_linkedsensors.begin();
    !(is==m_linkedsensors.end());is++)
    {
        SCA_ISensor* sensor = *is;
        if (sensor->GetName() == identifiername)
        {
            identifierval = new CBoolValue(sensor->GetState());
            //identifierval = sensor->AddRef();
        }

        //if (!sensor->IsPositiveTrigger())
        //{
        //  sensorresult = false;
        //  break;
        //}
    }

    if (identifierval)
        return identifierval;

    return  GetParent()->FindIdentifier(identifiername);

}