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//static const char* sccsid = "@(#)Expr_Sum.cxx 3.2 95/01/10"; // Do not delete this line. Used by sccs.
// Copyright: Matra-Datavision 1991
// File: Expr_Sum.cxx
// Created: Fri Apr 19 09:34:35 1991
// Author: Arnaud BOUZY
// <adn>
#ifndef DEB
#define No_Standard_RangeError
#define No_Standard_OutOfRange
#endif
#include <Expr_Sum.ixx>
#include <Standard_OutOfRange.hxx>
#include <TColStd_Array1OfInteger.hxx>
#include <Expr_NumericValue.hxx>
#include <Expr.hxx>
Expr_Sum::Expr_Sum (const Expr_SequenceOfGeneralExpression& exps)
{
Standard_Integer i;
Standard_Integer max = exps.Length();
for (i=1; i<= max; i++) {
AddOperand(exps(i));
}
}
Expr_Sum::Expr_Sum (const Handle(Expr_GeneralExpression)& exp1, const Handle(Expr_GeneralExpression)& exp2)
{
AddOperand(exp1);
AddOperand(exp2);
}
Handle(Expr_GeneralExpression) Expr_Sum::Copy () const
{
Expr_SequenceOfGeneralExpression ops;
Standard_Integer i;
Standard_Integer max = NbOperands();
for (i=1; i <= max; i++) {
ops.Append(Expr::CopyShare(Operand(i)));
}
return new Expr_Sum(ops);
}
Standard_Boolean Expr_Sum::IsIdentical (const Handle(Expr_GeneralExpression)& Other) const
{
if (!Other->IsKind(STANDARD_TYPE(Expr_Sum))) {
return Standard_False;
}
Handle(Expr_Sum) me = this;
Handle(Expr_Sum) SOther = Handle(Expr_Sum)::DownCast(Other);
Standard_Integer max = NbOperands();
if (SOther->NbOperands() != max) {
return Standard_False;
}
Handle(Expr_GeneralExpression) myop;
Handle(Expr_GeneralExpression) hisop;
Standard_Integer i=1;
TColStd_Array1OfInteger tab(1,max);
for (Standard_Integer k=1; k<=max;k++) {
tab(k)=0;
}
Standard_Boolean ident = Standard_True;
while ((i<=max) && (ident)) {
Standard_Integer j=1;
Standard_Boolean found = Standard_False;
myop = Operand(i);
while ((j<=max) && (!found)) {
hisop = SOther->Operand(j);
found = myop->IsIdentical(hisop);
if (found) {
found = (tab(j) == 0);
tab(j)=i;
}
j++;
}
ident = found;
i++;
}
return ident;
}
Standard_Boolean Expr_Sum::IsLinear () const
{
Standard_Boolean result = Standard_True;
Standard_Integer i=1;
Standard_Integer max = NbOperands();
while ((i <= max) && result) {
result = Operand(i)->IsLinear();
i++;
}
return result;
}
Handle(Expr_GeneralExpression) Expr_Sum::Derivative (const Handle(Expr_NamedUnknown)& X) const
{
Expr_SequenceOfGeneralExpression opsder;
Standard_Integer i;
Standard_Integer max = NbOperands();
for (i=1; i<= max; i++) {
opsder.Append(Operand(i)->Derivative(X));
}
Handle(Expr_Sum) deriv = new Expr_Sum(opsder);
return deriv->ShallowSimplified();
}
Handle(Expr_GeneralExpression) Expr_Sum::NDerivative (const Handle(Expr_NamedUnknown)& X, const Standard_Integer N) const
{
if (N <= 0) {
Standard_OutOfRange::Raise();
}
Expr_SequenceOfGeneralExpression opsder;
Standard_Integer i;
Standard_Integer max = NbOperands();
for (i=1; i<= max; i++) {
opsder.Append(Operand(i)->NDerivative(X,N));
}
Handle(Expr_Sum) deriv = new Expr_Sum(opsder);
return deriv->ShallowSimplified();
}
Handle(Expr_GeneralExpression) Expr_Sum::ShallowSimplified () const
{
Standard_Integer i;
Standard_Integer max = NbOperands();
Standard_Integer nbvals =0;
Handle(Expr_GeneralExpression) op;
Expr_SequenceOfGeneralExpression newops;
Standard_Boolean subsum = Standard_False;
for (i=1; (i<= max) && !subsum; i++) {
op = Operand(i);
subsum = op->IsKind(STANDARD_TYPE(Expr_Sum));
}
if (subsum) {
Handle(Expr_GeneralExpression) other;
Handle(Expr_Sum) sumop;
Standard_Integer nbssumop;
for (i=1; i<= max; i++) {
op = Operand(i);
if (op->IsKind(STANDARD_TYPE(Expr_Sum))) {
sumop = Handle(Expr_Sum)::DownCast(op);
nbssumop = sumop->NbOperands();
for (Standard_Integer j=1; j<= nbssumop; j++) {
other = sumop->Operand(j);
newops.Append(other);
}
}
else {
newops.Append(op);
}
}
sumop = new Expr_Sum(newops);
return sumop->ShallowSimplified();
}
#ifndef DEB
Standard_Real vals = 0.;
#else
Standard_Real vals;
#endif
Standard_Boolean noone = Standard_True;
for (i = 1; i <= max ; i++) {
op = Operand(i);
if (op->IsKind(STANDARD_TYPE(Expr_NumericValue))) {
Handle(Expr_NumericValue) NVop = Handle(Expr_NumericValue)::DownCast(op);
if (nbvals == 0) {
noone = Standard_False;
vals = NVop->GetValue();
nbvals = 1;
}
else {
vals = vals + NVop->GetValue();
nbvals++;
}
}
else {
newops.Append(op);
}
}
if (!noone) {
if (newops.IsEmpty()) { // result is only numericvalue (even zero)
return new Expr_NumericValue(vals);
}
if (vals != 0.0) {
if (nbvals == 1) {
Handle(Expr_Sum) me = this;
return me;
}
Handle(Expr_NumericValue) thevals = new Expr_NumericValue(vals);
newops.Append(thevals); // non-zero value added
return new Expr_Sum(newops);
}
if (newops.Length() == 1) {
// case X + 0
return newops(1);
}
return new Expr_Sum(newops);
}
Handle(Expr_Sum) me = this;
return me;
}
Standard_Real Expr_Sum::Evaluate(const Expr_Array1OfNamedUnknown& vars, const TColStd_Array1OfReal& vals) const
{
Standard_Integer max = NbOperands();
Standard_Real res = 0.0;
for (Standard_Integer i=1; i<= max; i++) {
res = res + Operand(i)->Evaluate(vars,vals);
}
return res;
}
TCollection_AsciiString Expr_Sum::String() const
{
Handle(Expr_GeneralExpression) op;
Standard_Integer nbop = NbOperands();
op = Operand(1);
TCollection_AsciiString str;
if (op->NbSubExpressions() > 1) {
str = "(";
str += op->String();
str += ")";;
}
else {
str = op->String();
}
for (Standard_Integer i=2; i<=nbop; i++) {
str += "+";
op = Operand(i);
if (op->NbSubExpressions() > 1) {
str += "(";
str += op->String();
str += ")";;
}
else {
str += op->String();
}
}
return str;
}
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