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// IfExpr.cpp: implementation of the CIfExpr class.
/*
* Copyright (c) 1996-2000 Erwin Coumans <coockie@acm.org>
*
* Permission to use, copy, modify, distribute and sell this software
* and its documentation for any purpose is hereby granted without fee,
* provided that the above copyright notice appear in all copies and
* that both that copyright notice and this permission notice appear
* in supporting documentation. Erwin Coumans makes no
* representations about the suitability of this software for any
* purpose. It is provided "as is" without express or implied warranty.
*
*/
#include "IfExpr.h"
#include "EmptyValue.h"
#include "ErrorValue.h"
//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////
CIfExpr::CIfExpr()
{
}
CIfExpr::CIfExpr(CExpression *guard, CExpression *e1, CExpression *e2)
/*
pre:
effect: constructs an CifExpr-object corresponding to IF(guard, e1, e2)
*/
{
m_guard = guard;
m_e1 = e1;
m_e2 = e2;
}
CIfExpr::~CIfExpr()
/*
pre:
effect: dereferences the object
*/
{
if (m_guard)
m_guard->Release();
if (m_e1)
m_e1->Release();
if (m_e2)
m_e2->Release();
}
CValue* CIfExpr::Calculate()
/*
pre:
ret: a new object containing the value of m_e1 if m_guard is a boolean TRUE
a new object containing the value of m_e2 if m_guard is a boolean FALSE
an new errorvalue if m_guard is not a boolean
*/
{
CValue *guardval;
guardval = m_guard->Calculate();
STR_String text = guardval->GetText();
guardval->Release();
if (text == STR_String("TRUE"))
{
return m_e1->Calculate();
}
else if (text == STR_String("FALSE"))
{
return m_e2->Calculate();
}
else
{
return new CErrorValue("Guard should be of boolean type");
}
}
bool CIfExpr::MergeExpression(CExpression *otherexpr)
{
assertd(false);
return false;
}
bool CIfExpr::IsInside(float x,float y,float z,bool bBorderInclude)
{
assertd(false);
return false;
}
bool CIfExpr::NeedsRecalculated()
{
return (m_guard->NeedsRecalculated() ||
m_e1->NeedsRecalculated() ||
m_e2->NeedsRecalculated());
}
CExpression* CIfExpr::CheckLink(std::vector<CBrokenLinkInfo*>& brokenlinks)
{
assertd(false);
return NULL;
}
void CIfExpr::ClearModified()
{
assertd(false);
}
void CIfExpr::BroadcastOperators(VALUE_OPERATOR op)
{
assertd(false);
}
unsigned char CIfExpr::GetExpressionID()
{
return CIFEXPRESSIONID;
}
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