Method ImportBegin

IO/Import/vtkVRMLImporter.cxx:205–295

------------------------------------------------------------------------------

//------------------------------------------------------------------------------
int vtkVRMLImporter::ImportBegin()
{
  int ret = 1;
  try
  {
    this->ActorCollection->RemoveAllItems();
    this->LightCollection->RemoveAllItems();

    if (this->CurrentTransform)
    {
      this->CurrentTransform->Delete();
    }
    this->CurrentTransform = vtkTransform::New();

    this->Parser->CurrentProtoStack = nullptr;
    this->Parser->memyyInput_i = 0;
    this->Parser->memyyInput_j = 0;

    vtkVRMLAllocator::Initialize();
    this->Parser->typeList = new vtkVRMLVectorType<VrmlNodeType*>;
    this->Parser->typeList->Init();

    this->Parser->useList = new vtkVRMLVectorType<vtkVRMLUseStruct*>;
    this->Parser->useList->Init();

    this->Parser->currentField = new vtkVRMLVectorType<VrmlNodeType::FieldRec*>;
    this->Parser->currentField->Init();

    if (!this->OpenImportFile())
    {
      throw std::exception();
    }

    // This is actually where it all takes place, Since VRML is a SG
    // And is state based, I need to create actors, cameras, and lights
    // as I go. The Import* routines are not used.
    this->Parser->CurrentProtoStack = new vtkVRMLVectorType<VrmlNodeType*>;

    // Lets redefine the YY_INPUT macro on Flex and get chars from memory
    this->Parser->theyyInput = vtkVRMLYaccData::memyyInput;
    // Crank up the yacc parser...
    this->Parser->yydebug = 0;
    this->Parser->yy_flex_debug = 0;
    this->Parser->yyparse(this);
    this->Parser->yyin = nullptr;
    this->Parser->yyResetLineNumber();

    // Not sure why I have to do this but its not working when
    // When I use the FileFD file pointer...
    // File existence already checked.
    this->Parser->yyin = vtksys::SystemTools::Fopen(this->GetFileName(), "r");
    if (!this->Parser->yyin)
    {
      throw std::exception();
    }

    // reset the lex input routine
    this->Parser->theyyInput = vtkVRMLYaccData::defyyInput;