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//static const char* sccsid = "@(#)Expr_Difference.cxx 3.2 95/01/10"; // Do not delete this line. Used by sccs.
// Copyright: Matra-Datavision 1991
// File: Expr_Difference.cxx
// Created: Wed Apr 17 09:32:02 1991
// Author: Arnaud BOUZY
// <adn>
#include <Expr_Difference.ixx>
#include <Expr_UnaryMinus.hxx>
#include <Expr_NumericValue.hxx>
#include <Expr_Sum.hxx>
#include <Expr_Operators.hxx>
#include <Expr.hxx>
#include <Standard_OutOfRange.hxx>
Expr_Difference::Expr_Difference (const Handle(Expr_GeneralExpression)& exp1, const Handle(Expr_GeneralExpression)& exp2)
{
CreateFirstOperand(exp1);
CreateSecondOperand(exp2);
}
Handle(Expr_GeneralExpression) Expr_Difference::ShallowSimplified() const
{
Handle(Expr_GeneralExpression) myfirst = FirstOperand();
Handle(Expr_GeneralExpression) mysecond = SecondOperand();
Standard_Boolean nvfirst = myfirst->IsKind(STANDARD_TYPE(Expr_NumericValue));
Standard_Boolean nvsecond = mysecond->IsKind(STANDARD_TYPE(Expr_NumericValue));
if (nvfirst && nvsecond) {
// case num1 - num2
Handle(Expr_NumericValue) myNVfirst = Handle(Expr_NumericValue)::DownCast(myfirst);
Handle(Expr_NumericValue) myNVsecond = Handle(Expr_NumericValue)::DownCast(mysecond);
return new Expr_NumericValue(myNVfirst->GetValue()-myNVsecond->GetValue());
}
if (nvfirst && !nvsecond) {
// case num1 - X2
Handle(Expr_NumericValue) myNVfirst = Handle(Expr_NumericValue)::DownCast(myfirst);
if (myNVfirst->GetValue() == 0.0) {
// case 0 - X2
return - mysecond;
}
}
if (!nvfirst && nvsecond) {
// case X1 - num2
Handle(Expr_NumericValue) myNVsecond = Handle(Expr_NumericValue)::DownCast(mysecond);
if (myNVsecond->GetValue() == 0.0) {
// case X1 - 0
return myfirst;
}
}
// Treat UnaryMinus case
Standard_Boolean unfirst = myfirst->IsKind(STANDARD_TYPE(Expr_UnaryMinus));
Standard_Boolean unsecond = mysecond->IsKind(STANDARD_TYPE(Expr_UnaryMinus));
if (unfirst && unsecond) {
// case (-ssX1) - (-ssX2) = ssX2 - ssX1
Handle(Expr_GeneralExpression) ssop1 = myfirst->SubExpression(1);
Handle(Expr_GeneralExpression) ssop2 = mysecond->SubExpression(1);
return ssop2 - ssop1;
}
if (unfirst && !unsecond) {
// case (-ssX1) - X2 = -( ssX1 + X2)
Handle(Expr_GeneralExpression) ssop1 = myfirst->SubExpression(1);
return -(ssop1 + mysecond);
}
if (!unfirst && unsecond) {
// case X1 - (-ssX2) = X1 + ssX2
Handle(Expr_GeneralExpression) ssop2 = mysecond->SubExpression(1);
return myfirst + ssop2;
}
Handle(Expr_Difference) me = this;
return me;
}
Handle(Expr_GeneralExpression) Expr_Difference::Copy () const
{
return Expr::CopyShare(FirstOperand()) - Expr::CopyShare(SecondOperand());
}
Standard_Boolean Expr_Difference::IsIdentical (const Handle(Expr_GeneralExpression)& Other) const
{
Standard_Boolean ident = Standard_False;
if (Other->IsKind(STANDARD_TYPE(Expr_Difference))) {
Handle(Expr_GeneralExpression) myfirst = FirstOperand();
Handle(Expr_GeneralExpression) mysecond = SecondOperand();
Handle(Expr_Difference) DOther = Handle(Expr_Difference)::DownCast(Other);
Handle(Expr_GeneralExpression) fother = DOther->FirstOperand();
Handle(Expr_GeneralExpression) sother = DOther->SecondOperand();
if ((myfirst->IsIdentical(fother)) &&
(mysecond->IsIdentical(sother))) {
ident = Standard_True;
}
}
return ident;
}
Standard_Boolean Expr_Difference::IsLinear () const
{
Handle(Expr_GeneralExpression) myfirst = FirstOperand();
Handle(Expr_GeneralExpression) mysecond = SecondOperand();
return (myfirst->IsLinear() && mysecond->IsLinear());
}
Handle(Expr_GeneralExpression) Expr_Difference::Derivative (const Handle(Expr_NamedUnknown)& X) const
{
if (!Contains(X)) {
return new Expr_NumericValue(0.0);
}
Handle(Expr_GeneralExpression) myfirst = FirstOperand();
Handle(Expr_GeneralExpression) mysecond = SecondOperand();
myfirst = myfirst->Derivative(X);
mysecond = mysecond->Derivative(X);
Handle(Expr_Difference) der = myfirst - mysecond;
return der->ShallowSimplified();
}
Handle(Expr_GeneralExpression) Expr_Difference::NDerivative (const Handle(Expr_NamedUnknown)& X, const Standard_Integer N) const
{
if (N <= 0) {
Standard_OutOfRange::Raise();
}
if (!Contains(X)) {
return new Expr_NumericValue(0.0);
}
Handle(Expr_GeneralExpression) myfirst = FirstOperand();
Handle(Expr_GeneralExpression) mysecond = SecondOperand();
myfirst = myfirst->NDerivative(X,N);
mysecond = mysecond->NDerivative(X,N);
Handle(Expr_Difference) der = myfirst - mysecond;
return der->ShallowSimplified();
}
Standard_Real Expr_Difference::Evaluate(const Expr_Array1OfNamedUnknown& vars, const TColStd_Array1OfReal& vals) const
{
Standard_Real res = FirstOperand()->Evaluate(vars,vals);
return res - SecondOperand()->Evaluate(vars,vals);
}
TCollection_AsciiString Expr_Difference::String() const
{
Handle(Expr_GeneralExpression) op1 = FirstOperand();
Handle(Expr_GeneralExpression) op2 = SecondOperand();
TCollection_AsciiString str;
if (op1->NbSubExpressions() > 1) {
str += "(";
str += op1->String();
str += ")";
}
else {
str = op1->String();
}
str += "-";
if (op2->NbSubExpressions() > 1) {
str += "(";
str += op2->String();
str += ")";
}
else {
str += op2->String();
}
return str;
}
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