source: trunk/VUT/GtpVisibilityPreprocessor/src/X3dParser.cpp @ 182

// ---------------------------------------------------------------------------
//  Includes for all the program files to see
// ---------------------------------------------------------------------------
#include <string.h>
#include <stdlib.h>
#include <iostream>
using namespace std;
#include <xercesc/util/PlatformUtils.hpp>

// ---------------------------------------------------------------------------
//  Includes
// ---------------------------------------------------------------------------
#include <xercesc/framework/StdInInputSource.hpp>
#include <xercesc/parsers/SAXParser.hpp>
#include <xercesc/util/OutOfMemoryException.hpp>

// ---------------------------------------------------------------------------
//  Includes
// ---------------------------------------------------------------------------
#include <xercesc/sax/AttributeList.hpp>
#include <xercesc/sax/SAXParseException.hpp>
#include <xercesc/sax/SAXException.hpp>

#include "X3dParser.h"

#include "X3dParserXerces.h"
#include "Mesh.h"
#include "SceneGraph.h"

// ---------------------------------------------------------------------------
//  Local data
//
//  doNamespaces
//      Indicates whether namespace processing should be enabled or not.
//      The default is no, but -n overrides that.
//
//  doSchema
//      Indicates whether schema processing should be enabled or not.
//      The default is no, but -s overrides that.
//
//  schemaFullChecking
//      Indicates whether full schema constraint checking should be enabled or not.
//      The default is no, but -s overrides that.
//
//  valScheme
//      Indicates what validation scheme to use. It defaults to 'auto', but
//      can be set via the -v= command.
// ---------------------------------------------------------------------------
static bool     doNamespaces       = false;
static bool     doSchema           = false;
static bool     schemaFullChecking = false;
static SAXParser::ValSchemes    valScheme       = SAXParser::Val_Auto;





// ---------------------------------------------------------------------------
//  StdInParseHandlers: Constructors and Destructor
// ---------------------------------------------------------------------------
X3dParseHandlers::X3dParseHandlers(SceneGraphNode *root) :
  mElementCount(0)
  , mAttrCount(0)
  , mCharacterCount(0)
  , mSpaceCount(0)
{
  mCurrentNode = root;
}

X3dParseHandlers::~X3dParseHandlers()
{
}


// ---------------------------------------------------------------------------
//  StdInParseHandlers: Implementation of the SAX DocumentHandler interface
// ---------------------------------------------------------------------------
void X3dParseHandlers::endElement(const XMLCh* const name)
{
  StrX lname(name);
  string element(lname.LocalForm());
  if (element == "Shape")
    EndShape();
}

void
X3dParseHandlers::EndShape()
{
  if (mCurrentMesh->mFaces.size()) {
    mCurrentMesh->Preprocess();
    // make an instance of this mesh
    MeshInstance *mi = new MeshInstance(mCurrentMesh);
    mCurrentNode->mGeometry.push_back(mi);
  } else {
    cout<<"X";
    delete mCurrentMesh;
  }
  mCurrentMesh = NULL;
}

void
X3dParseHandlers::StartIndexedFaceSet(
                                      AttributeList&  attributes)
{
  int len = attributes.getLength();
  int i;
  VertexIndexContainer vertices;
  
  for (i=0; i < len; i++) {
    string attrName(StrX(attributes.getName(i)).LocalForm());
    if (attrName == "coordIndex") {
      StrX attrValue(attributes.getValue(i));
      // handle coordIndex
      vertices.clear();
      const char *ptr = attrValue.LocalForm();
      char *endptr;
      while(1) {
        int index = strtol(ptr, &endptr, 10);
        if (ptr == endptr || index == -1) {
          if (vertices.size() > 2) {
            Face *face = new Face(vertices);
            mCurrentMesh->mFaces.push_back(face);
          }
          vertices.clear();
          if (ptr == endptr)
            break;
        } else {
          vertices.push_back(index);
        }
        ptr = endptr;
      }
    }
  }
}

void
X3dParseHandlers::StartMaterial(
                                AttributeList&  attributes)
{
  int len = attributes.getLength();
  int i;
  if (!mCurrentMesh->mMaterial)
    mCurrentMesh->mMaterial = new Material;
  for (i=0; i < len; i++) {
    string attrName(StrX(attributes.getName(i)).LocalForm());
    StrX attrValue(attributes.getValue(i));
    const char *ptr = attrValue.LocalForm();
    if (attrName == "diffuseColor") {
      float r, g, b;
      if (sscanf(ptr, "%f %f %f", &r, &g, &b) == 3)
        mCurrentMesh->mMaterial->mDiffuseColor = RgbColor(r, g, b);
    }
  }
}

void
X3dParseHandlers::StartCoordinate(
                                  AttributeList&  attributes)
{
  int len = attributes.getLength();
  int i;
  VertexContainer vertices;
  for (i=0; i < len; i++) {
    string attrName(StrX(attributes.getName(i)).LocalForm());
    if (attrName == "point") {
      StrX attrValue(attributes.getValue(i));
      const char *ptr = attrValue.LocalForm();
      char *endptr;
      while(1) {
        float x = strtod(ptr, &endptr);
        if (ptr == endptr)
          break;
        ptr = endptr;
        float y = strtod(ptr, &endptr);
        if (ptr == endptr)
          break;
        ptr = endptr;
        float z = strtod(ptr, &endptr);
        if (ptr == endptr)
          break;
        ptr = endptr;
        if (*ptr == ',')
          ptr++;
        Vector3 v(x, y, z);
        vertices.push_back(v);
      }
      mCurrentMesh->mVertices = vertices;
    }
  }
}


void
X3dParseHandlers::startElement(const XMLCh* const name,
                               AttributeList&  attributes)
{
  StrX lname(name);
  string element(lname.LocalForm());
  
  if (element == "IndexedFaceSet") {
    // create a new mesh node in the scene graph
    StartIndexedFaceSet(attributes);
  }

  if (element == "Shape") {
    cout<<"+";
    mCurrentMesh = new Mesh;
  }
  
  if (element == "Coordinate") {
    if (mCurrentMesh)
      StartCoordinate(attributes);
  }
  
  if (element == "Material") {
    StartMaterial(attributes);
  }

  mElementCount++;
  mAttrCount += attributes.getLength();
}

void
X3dParseHandlers::characters(const XMLCh* const chars,
                             const unsigned int length)
{
  mCharacterCount += length;
}

void
X3dParseHandlers::ignorableWhitespace(const XMLCh* const chars,
                                      const unsigned int length)
{
  mSpaceCount += length;
}

void
X3dParseHandlers::resetDocument()
{
  mAttrCount = 0;
  mCharacterCount = 0;
  mElementCount = 0;
  mSpaceCount = 0;
}



// ---------------------------------------------------------------------------
//  StdInParseHandlers: Overrides of the SAX ErrorHandler interface
// ---------------------------------------------------------------------------
void
X3dParseHandlers::error(const SAXParseException& e)
{
  XERCES_STD_QUALIFIER cerr << "\nError at (file " << StrX(e.getSystemId())
                            << ", line " << e.getLineNumber()
                            << ", char " << e.getColumnNumber()
                            << "): " << StrX(e.getMessage()) << XERCES_STD_QUALIFIER endl;
}

void
X3dParseHandlers::fatalError(const SAXParseException& e)
{
  XERCES_STD_QUALIFIER cerr << "\nFatal Error at (file " << StrX(e.getSystemId())
                            << ", line " << e.getLineNumber()
                            << ", char " << e.getColumnNumber()
                            << "): " << StrX(e.getMessage()) << XERCES_STD_QUALIFIER endl;
}

void
X3dParseHandlers::warning(const SAXParseException& e)
{
  XERCES_STD_QUALIFIER cerr << "\nWarning at (file " << StrX(e.getSystemId())
                            << ", line " << e.getLineNumber()
                            << ", char " << e.getColumnNumber()
                            << "): " << StrX(e.getMessage()) << XERCES_STD_QUALIFIER endl;
}


bool
X3dParser::ParseFile(const string filename,
                     SceneGraphNode **root)
{
  // Initialize the XML4C system
  try {
    XMLPlatformUtils::Initialize();
  }
  
  catch (const XMLException& toCatch)
    {
      XERCES_STD_QUALIFIER cerr << "Error during initialization! Message:\n"
                                << StrX(toCatch.getMessage()) << XERCES_STD_QUALIFIER endl;
      return false;
    }
  
  
  //
  //  Create a SAX parser object. Then, according to what we were told on
  //  the command line, set the options.
  //
  SAXParser* parser = new SAXParser;
  parser->setValidationScheme(valScheme);
  parser->setDoNamespaces(doNamespaces);
  parser->setDoSchema(doSchema);
  parser->setValidationSchemaFullChecking(schemaFullChecking);
  

  //
  //  Create our SAX handler object and install it on the parser, as the
  //  document and error handler. We are responsible for cleaning them
  //  up, but since its just stack based here, there's nothing special
  //  to do.
  //
  *root = new SceneGraphNode;
  X3dParseHandlers handler(*root);
  parser->setDocumentHandler(&handler);
  parser->setErrorHandler(&handler);
  
  unsigned long duration;
  int errorCount = 0;
  // create a faux scope so that 'src' destructor is called before
  // XMLPlatformUtils::Terminate
  {
    //
    //  Kick off the parse and catch any exceptions. Create a standard
    //  input input source and tell the parser to parse from that.
    //
    //    StdInInputSource src;
    try
      {
        const unsigned long startMillis = XMLPlatformUtils::getCurrentMillis();
        parser->parse(filename.c_str());
        const unsigned long endMillis = XMLPlatformUtils::getCurrentMillis();
        duration = endMillis - startMillis;
        errorCount = parser->getErrorCount();
      }
    catch (const OutOfMemoryException&)
      {
        XERCES_STD_QUALIFIER cerr << "OutOfMemoryException" << XERCES_STD_QUALIFIER endl;
        errorCount = 2;
        return false;
      }
    catch (const XMLException& e)
      {
        XERCES_STD_QUALIFIER cerr << "\nError during parsing: \n"
                                  << StrX(e.getMessage())
                                  << "\n" << XERCES_STD_QUALIFIER endl;
        errorCount = 1;
        return false;
      }

    
    // Print out the stats that we collected and time taken
    if (!errorCount) {
      XERCES_STD_QUALIFIER cout << filename << ": " << duration << " ms ("
                                << handler.GetElementCount() << " elems, "
                                << handler.GetAttrCount() << " attrs, "
                                << handler.GetSpaceCount() << " spaces, "
                                << handler.GetCharacterCount() << " chars)" << XERCES_STD_QUALIFIER endl;
    }
  }
  
  //
  //  Delete the parser itself.  Must be done prior to calling Terminate, below.
  //
  delete parser;
  
  XMLPlatformUtils::Terminate();
  
  if (errorCount > 0)
    return false;
  else
    return true;
}