OCCT/src/Expr/Expr_PolyExpression.cxx

// Created on: 1991-04-16
// Created by: Arnaud BOUZY
// Copyright (c) 1991-1999 Matra Datavision
// Copyright (c) 1999-2012 OPEN CASCADE SAS
//
// The content of this file is subject to the Open CASCADE Technology Public
// License Version 6.5 (the "License"). You may not use the content of this file
// except in compliance with the License. Please obtain a copy of the License
// at http://www.opencascade.org and read it completely before using this file.
//
// The Initial Developer of the Original Code is Open CASCADE S.A.S., having its
// main offices at: 1, place des Freres Montgolfier, 78280 Guyancourt, France.
//
// The Original Code and all software distributed under the License is
// distributed on an "AS IS" basis, without warranty of any kind, and the
// Initial Developer hereby disclaims all such warranties, including without
// limitation, any warranties of merchantability, fitness for a particular
// purpose or non-infringement. Please see the License for the specific terms
// and conditions governing the rights and limitations under the License.


#include <Expr_PolyExpression.ixx>
#include <Expr_NamedUnknown.hxx>
#include <Expr_InvalidOperand.hxx>
#include <Standard_OutOfRange.hxx>
#include <Standard_DimensionMismatch.hxx>

Expr_PolyExpression::Expr_PolyExpression()
{
}

Standard_Integer Expr_PolyExpression::NbOperands () const
{
  return myOperands.Length();
}

void Expr_PolyExpression::SetOperand (const Handle(Expr_GeneralExpression)& exp, const Standard_Integer index)
{
  Handle(Expr_PolyExpression) me = this;
  if (exp == me) {
    Expr_InvalidOperand::Raise();
  }
  if (exp->Contains(me)) {
    Expr_InvalidOperand::Raise();
  }
  myOperands(index) = exp;
}

void Expr_PolyExpression::AddOperand (const Handle(Expr_GeneralExpression)& exp)
{
  myOperands.Append(exp);
}

void Expr_PolyExpression::RemoveOperand (const Standard_Integer index)
{
  if (myOperands.Length() <= 2) {
    Standard_DimensionMismatch::Raise();
  }
  myOperands.Remove(index);
}

Standard_Integer Expr_PolyExpression::NbSubExpressions () const
{
  return NbOperands();
}

const Handle(Expr_GeneralExpression)& Expr_PolyExpression::SubExpression (const Standard_Integer I) const
{
  return Operand(I);
}

Standard_Boolean Expr_PolyExpression::ContainsUnknowns () const 
{
  Standard_Boolean found = Standard_False;
  Standard_Integer nbop = NbOperands();
  Standard_Integer i = 1;
  Handle(Expr_GeneralExpression) expop;

  while ((!found) && (i <= nbop)) {
    expop = Operand(i);
    found = expop->IsKind(STANDARD_TYPE(Expr_NamedUnknown));
    i++;
  }
  i = 1;
  while ((!found) && (i <= nbop)) {
    expop = Operand(i);
    found = expop->ContainsUnknowns();
    i++;
  }
  return found;
}

Standard_Boolean Expr_PolyExpression::Contains (const Handle(Expr_GeneralExpression)& exp) const
{
  Standard_Boolean found = Standard_False;
  Standard_Integer nbop = NbOperands();
  Standard_Integer i = 1;
  Handle(Expr_GeneralExpression) expop;

  while ((!found) && (i <= nbop)) {
    expop = Operand(i);
    found = (expop == exp);
    i++;
  }
  i = 1;
  while ((!found) && (i <= nbop)) {
    expop = Operand(i);
    found = expop->Contains(exp);
    i++;
  }
  return found;
}

void Expr_PolyExpression::Replace (const Handle(Expr_NamedUnknown)& var, const Handle(Expr_GeneralExpression)& with)
{
  Standard_Integer nbop = NbOperands();
  Standard_Integer i;
  Handle(Expr_GeneralExpression) expop;

  for(i=1;i <= nbop; i++) {
    expop = Operand(i);
    if (expop == var) {
      SetOperand(with,i);
    }
    else {
      if (expop->Contains(var)) {
	expop->Replace(var,with);
      }
    }
  }
}


Handle(Expr_GeneralExpression) Expr_PolyExpression::Simplified() const
{
  Handle(Expr_PolyExpression) cop = Handle(Expr_PolyExpression)::DownCast(Copy());
  Standard_Integer i;
  Standard_Integer max = cop->NbOperands();
  Handle(Expr_GeneralExpression) op;
  for (i=1; i<= max; i++) {
    op = cop->Operand(i);
    cop->SetOperand(op->Simplified(),i);
  }
  return cop->ShallowSimplified();
}