package net.sourceforge.phpeclipse.phpeditor;

/**********************************************************************
Copyright (c) 2000, 2002 IBM Corp. and others.
All rights reserved. This program and the accompanying materials
are made available under the terms of the Common Public License v1.0
which accompanies this distribution, and is available at
http://www.eclipse.org/legal/cpl-v10.html

Contributors:
    IBM Corporation - Initial implementation
    Klaus Hartlage - www.eclipseproject.de
**********************************************************************/

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import net.sourceforge.phpdt.core.IBuffer;
import net.sourceforge.phpdt.core.IBufferFactory;
import net.sourceforge.phpdt.core.ICompilationUnit;
import net.sourceforge.phpdt.core.IJavaModelStatusConstants;
import net.sourceforge.phpdt.core.IOpenable;
import net.sourceforge.phpdt.core.IProblemRequestor;
import net.sourceforge.phpdt.core.JavaModelException;
import net.sourceforge.phpdt.core.compiler.IProblem;
import net.sourceforge.phpdt.internal.ui.PHPStatusConstants;
import net.sourceforge.phpdt.internal.ui.PHPUIStatus;
import net.sourceforge.phpdt.internal.ui.text.java.IProblemRequestorExtension;
import net.sourceforge.phpdt.ui.PreferenceConstants;
import net.sourceforge.phpdt.ui.text.JavaTextTools;
import net.sourceforge.phpeclipse.PHPCore;
import net.sourceforge.phpeclipse.PHPeclipsePlugin;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IMarker;
import org.eclipse.core.resources.IMarkerDelta;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.jface.preference.IPreferenceStore;
import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.DefaultLineTracker;
import org.eclipse.jface.text.Document;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.IDocumentPartitioner;
import org.eclipse.jface.text.ILineTracker;
import org.eclipse.jface.text.Position;
import org.eclipse.jface.text.source.Annotation;
import org.eclipse.jface.text.source.AnnotationModelEvent;
import org.eclipse.jface.text.source.IAnnotationModel;
import org.eclipse.jface.text.source.IAnnotationModelListener;
import org.eclipse.jface.text.source.IAnnotationModelListenerExtension;
import org.eclipse.jface.util.IPropertyChangeListener;
import org.eclipse.jface.util.ListenerList;
import org.eclipse.jface.util.PropertyChangeEvent;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.Canvas;
import org.eclipse.swt.widgets.Display;
import org.eclipse.ui.IEditorInput;
import org.eclipse.ui.IFileEditorInput;
import org.eclipse.ui.editors.text.FileDocumentProvider;
import org.eclipse.ui.part.FileEditorInput;
import org.eclipse.ui.texteditor.AbstractMarkerAnnotationModel;
import org.eclipse.ui.texteditor.MarkerAnnotation;
import org.eclipse.ui.texteditor.ResourceMarkerAnnotationModel;

/** 
 * The PHPDocumentProvider provides the IDocuments used by java editors.
 */

public class PHPDocumentProvider extends FileDocumentProvider {
  /**
  			 * Here for visibility issues only.
  			 */
  protected class _FileSynchronizer extends FileSynchronizer {
    public _FileSynchronizer(IFileEditorInput fileEditorInput) {
      super(fileEditorInput);
    }
  };
  /**
  		 * Bundle of all required informations to allow working copy management. 
  		 */
  protected class CompilationUnitInfo extends FileInfo {

    ICompilationUnit fCopy;

    public CompilationUnitInfo(
      IDocument document,
      IAnnotationModel model,
      _FileSynchronizer fileSynchronizer,
      ICompilationUnit copy) {
      super(document, model, fileSynchronizer);
      fCopy = copy;
    }

    public void setModificationStamp(long timeStamp) {
      fModificationStamp = timeStamp;
    }
  };
  /**
  		 * Annotation model dealing with java marker annotations and temporary problems.
  		 * Also acts as problem requestor for its compilation unit. Initialiy inactive. Must explicitly be
  		 * activated.
  		 */
  protected class CompilationUnitAnnotationModel
    extends ResourceMarkerAnnotationModel
    implements IProblemRequestor, IProblemRequestorExtension {
    private List fCollectedProblems;
    private List fCurrentlyOverlaid = new ArrayList();
    private List fGeneratedAnnotations;

    private IFileEditorInput fInput;
    private boolean fIsActive = false;
    private List fPreviouslyOverlaid = null;
    private IProgressMonitor fProgressMonitor;

    private ReverseMap fReverseMap = new ReverseMap();

    public CompilationUnitAnnotationModel(IFileEditorInput input) {
      super(input.getFile());
      fInput = input;
    }

    /*
     * @see IProblemRequestor#acceptProblem(IProblem)
     */
    public void acceptProblem(IProblem problem) {
      if (isActive())
        fCollectedProblems.add(problem);
    }

    /*
     * @see AnnotationModel#addAnnotation(Annotation, Position, boolean)
     */
    protected void addAnnotation(Annotation annotation, Position position, boolean fireModelChanged) {
      super.addAnnotation(annotation, position, fireModelChanged);

      Object cached = fReverseMap.get(position);
      if (cached == null)
        fReverseMap.put(position, annotation);
      else if (cached instanceof List) {
        List list = (List) cached;
        list.add(annotation);
      } else if (cached instanceof Annotation) {
        List list = new ArrayList(2);
        list.add(cached);
        list.add(annotation);
        fReverseMap.put(position, list);
      }
    }

    /*
     * @see IProblemRequestor#beginReporting()
     */
    public void beginReporting() {
      ICompilationUnit unit = getWorkingCopy(fInput);
      if (unit != null) // && unit.getJavaProject().isOnClasspath(unit))
        fCollectedProblems = new ArrayList();
      else
        fCollectedProblems = null;
    }

    protected MarkerAnnotation createMarkerAnnotation(IMarker marker) {
      return new JavaMarkerAnnotation(marker);
    }

    protected Position createPositionFromProblem(IProblem problem) {
      int start = problem.getSourceStart();
      if (start < 0)
        return null;

      int length = problem.getSourceEnd() - problem.getSourceStart() + 1;
      if (length < 0)
        return null;

      return new Position(start, length);
    }

    /*
     * @see IProblemRequestor#endReporting()
     */
    public void endReporting() {
      if (!isActive())
        return;

      if (fProgressMonitor != null && fProgressMonitor.isCanceled())
        return;

      boolean isCanceled = false;
      boolean temporaryProblemsChanged = false;
      fPreviouslyOverlaid = fCurrentlyOverlaid;
      fCurrentlyOverlaid = new ArrayList();

      synchronized (fAnnotations) {

        if (fGeneratedAnnotations.size() > 0) {
          temporaryProblemsChanged = true;
          removeAnnotations(fGeneratedAnnotations, false, true);
          fGeneratedAnnotations.clear();
        }

        if (fCollectedProblems != null && fCollectedProblems.size() > 0) {

          Iterator e = fCollectedProblems.iterator();
          while (e.hasNext()) {

            IProblem problem = (IProblem) e.next();

            if (fProgressMonitor != null && fProgressMonitor.isCanceled()) {
              isCanceled = true;
              break;
            }

            Position position = createPositionFromProblem(problem);
            if (position != null) {

              ProblemAnnotation annotation = new ProblemAnnotation(problem);
              overlayMarkers(position, annotation);
              fGeneratedAnnotations.add(annotation);
              addAnnotation(annotation, position, false);

              temporaryProblemsChanged = true;
            }
          }

          fCollectedProblems.clear();
        }

        removeMarkerOverlays(isCanceled);
        fPreviouslyOverlaid.clear();
        fPreviouslyOverlaid = null;
      }

      if (temporaryProblemsChanged)
        fireModelChanged(new CompilationUnitAnnotationModelEvent(this, getResource(), false));
    }

    private Object getAnnotations(Position position) {
      return fReverseMap.get(position);
    }

    /*
     * @see AnnotationModel#fireModelChanged()
     */
    protected void fireModelChanged() {
      fireModelChanged(new CompilationUnitAnnotationModelEvent(this, getResource(), true));
    }

    /*
     * @see IProblemRequestor#isActive()
     */
    public boolean isActive() {
      return fIsActive && (fCollectedProblems != null);
    }

    /*
     * @see AnnotationModel#removeAllAnnotations(boolean)
     */
    protected void removeAllAnnotations(boolean fireModelChanged) {
      super.removeAllAnnotations(fireModelChanged);
      fReverseMap.clear();
    }

    /*
     * @see AnnotationModel#removeAnnotation(Annotation, boolean)
     */
    protected void removeAnnotation(Annotation annotation, boolean fireModelChanged) {
      Position position = getPosition(annotation);
      Object cached = fReverseMap.get(position);
      if (cached instanceof List) {
        List list = (List) cached;
        list.remove(annotation);
        if (list.size() == 1) {
          fReverseMap.put(position, list.get(0));
          list.clear();
        }
      } else if (cached instanceof Annotation) {
        fReverseMap.remove(position);
      }

      super.removeAnnotation(annotation, fireModelChanged);
    }

    private void removeMarkerOverlays(boolean isCanceled) {
      if (isCanceled) {
        fCurrentlyOverlaid.addAll(fPreviouslyOverlaid);
      } else if (fPreviouslyOverlaid != null) {
        Iterator e = fPreviouslyOverlaid.iterator();
        while (e.hasNext()) {
          JavaMarkerAnnotation annotation = (JavaMarkerAnnotation) e.next();
          annotation.setOverlay(null);
        }
      }
    }

    /*
     * @see IProblemRequestorExtension#setIsActive(boolean)
     */
    public void setIsActive(boolean isActive) {
      if (fIsActive != isActive) {
        fIsActive = isActive;
        if (fIsActive)
          startCollectingProblems();
        else
          stopCollectingProblems();
      }
    }

    /*
     * @see IProblemRequestorExtension#setProgressMonitor(IProgressMonitor)
     */
    public void setProgressMonitor(IProgressMonitor monitor) {
      fProgressMonitor = monitor;
    }

    /**
     * Overlays value with problem annotation.
     * @param problemAnnotation
     */
    private void setOverlay(Object value, ProblemAnnotation problemAnnotation) {
      if (value instanceof JavaMarkerAnnotation) {
        JavaMarkerAnnotation annotation = (JavaMarkerAnnotation) value;
        if (annotation.isProblem()) {
          annotation.setOverlay(problemAnnotation);
          fPreviouslyOverlaid.remove(annotation);
          fCurrentlyOverlaid.add(annotation);
        }
      }
    }

    private void overlayMarkers(Position position, ProblemAnnotation problemAnnotation) {
      Object value = getAnnotations(position);
      if (value instanceof List) {
        List list = (List) value;
        for (Iterator e = list.iterator(); e.hasNext();)
          setOverlay(e.next(), problemAnnotation);
      } else {
        setOverlay(value, problemAnnotation);
      }
    }

    /**
     * Tells this annotation model to collect temporary problems from now on.
     */
    private void startCollectingProblems() {
      fCollectedProblems = new ArrayList();
      fGeneratedAnnotations = new ArrayList();
    }

    /**
     * Tells this annotation model to no longer collect temporary problems.
     */
    private void stopCollectingProblems() {
      if (fGeneratedAnnotations != null) {
        removeAnnotations(fGeneratedAnnotations, true, true);
        fGeneratedAnnotations.clear();
      }
      fCollectedProblems = null;
      fGeneratedAnnotations = null;
    }

    protected void update(IMarkerDelta[] markerDeltas) {

      super.update(markerDeltas);

      if (markerDeltas != null && markerDeltas.length > 0) {
        try {
          ICompilationUnit workingCopy = getWorkingCopy(fInput);
          if (workingCopy != null)
            workingCopy.reconcile(true, null);
        } catch (JavaModelException ex) {
          handleCoreException(ex, ex.getMessage());
        }
      }
    }
  }
  /**
  		 * Creates <code>IBuffer</code>s based on documents.
  		 */
  protected class BufferFactory implements IBufferFactory {

    private IDocument internalGetDocument(IFileEditorInput input) throws CoreException {
      IDocument document = getDocument(input);
      if (document != null)
        return document;
      return PHPDocumentProvider.this.createDocument(input);
    }

    public IBuffer createBuffer(IOpenable owner) {
      if (owner instanceof ICompilationUnit) {

        ICompilationUnit unit = (ICompilationUnit) owner;
        ICompilationUnit original = (ICompilationUnit) unit.getOriginalElement();
        IResource resource = original.getResource();
        if (resource instanceof IFile) {
          IFileEditorInput providerKey = new FileEditorInput((IFile) resource);

          IDocument document = null;
          IStatus status = null;

          try {
            document = internalGetDocument(providerKey);
          } catch (CoreException x) {
            status = x.getStatus();
            document = new Document();
            initializeDocument(document, providerKey);
          }

          DocumentAdapter adapter =
            new DocumentAdapter(unit, document, new DefaultLineTracker(), PHPDocumentProvider.this, providerKey);
          adapter.setStatus(status);
          return adapter;
        }

      }
      return DocumentAdapter.NULL;
    }
  };

  protected static class GlobalAnnotationModelListener implements IAnnotationModelListener, IAnnotationModelListenerExtension {

    private ListenerList fListenerList;

    public GlobalAnnotationModelListener() {
      fListenerList = new ListenerList();
    }

    public void addListener(IAnnotationModelListener listener) {
      fListenerList.add(listener);
    }

    /**
     * @see IAnnotationModelListenerExtension#modelChanged(AnnotationModelEvent)
     */
    public void modelChanged(AnnotationModelEvent event) {
      Object[] listeners = fListenerList.getListeners();
      for (int i = 0; i < listeners.length; i++) {
        Object curr = listeners[i];
        if (curr instanceof IAnnotationModelListenerExtension) {
          ((IAnnotationModelListenerExtension) curr).modelChanged(event);
        }
      }
    }

    /**
     * @see IAnnotationModelListener#modelChanged(IAnnotationModel)
     */
    public void modelChanged(IAnnotationModel model) {
      Object[] listeners = fListenerList.getListeners();
      for (int i = 0; i < listeners.length; i++) {
        ((IAnnotationModelListener) listeners[i]).modelChanged(model);
      }
    }

    public void removeListener(IAnnotationModelListener listener) {
      fListenerList.remove(listener);
    }
  }

  /**
  		 * Annotation representating an <code>IProblem</code>.
  		 */
  static protected class ProblemAnnotation extends Annotation implements IJavaAnnotation {

    //    private static Image fgQuickFixImage;
    //    private static Image fgQuickFixErrorImage;
    //    private static boolean fgQuickFixImagesInitialized = false;

    private List fOverlaids;
    private IProblem fProblem;
    private Image fImage;
    //    private boolean fQuickFixImagesInitialized = false;
    private AnnotationType fType;

    public ProblemAnnotation(IProblem problem) {

      fProblem = problem;
      setLayer(MarkerAnnotation.PROBLEM_LAYER + 1);

      if (IProblem.Task == fProblem.getID())
        fType = AnnotationType.TASK;
      else if (fProblem.isWarning())
        fType = AnnotationType.WARNING;
      else
        fType = AnnotationType.ERROR;
    }

    private void initializeImages() {
      // http://bugs.eclipse.org/bugs/show_bug.cgi?id=18936
      //      if (!fQuickFixImagesInitialized) {
      //        if (indicateQuixFixableProblems() && JavaCorrectionProcessor.hasCorrections(fProblem.getID())) {
      //          if (!fgQuickFixImagesInitialized) {
      //            fgQuickFixImage = JavaPluginImages.get(JavaPluginImages.IMG_OBJS_FIXABLE_PROBLEM);
      //            fgQuickFixErrorImage = JavaPluginImages.get(JavaPluginImages.IMG_OBJS_FIXABLE_ERROR);
      //            fgQuickFixImagesInitialized = true;
      //          }
      //          if (fType == AnnotationType.ERROR)
      //            fImage = fgQuickFixErrorImage;
      //          else
      //            fImage = fgQuickFixImage;
      //        }
      //        fQuickFixImagesInitialized = true;
      //      }
    }

    private boolean indicateQuixFixableProblems() {
      return PreferenceConstants.getPreferenceStore().getBoolean(PreferenceConstants.EDITOR_CORRECTION_INDICATION);
    }

    /*
     * @see Annotation#paint
     */
    public void paint(GC gc, Canvas canvas, Rectangle r) {
      initializeImages();
      if (fImage != null)
        drawImage(fImage, gc, canvas, r, SWT.CENTER, SWT.TOP);
    }

    /*
     * @see IJavaAnnotation#getImage(Display)
     */
    public Image getImage(Display display) {
      initializeImages();
      return fImage;
    }

    /*
     * @see IJavaAnnotation#getMessage()
     */
    public String getMessage() {
      return fProblem.getMessage();
    }

    /*
     * @see IJavaAnnotation#isTemporary()
     */
    public boolean isTemporary() {
      return true;
    }

    /*
     * @see IJavaAnnotation#getArguments()
     */
    public String[] getArguments() {
      return isProblem() ? fProblem.getArguments() : null;
    }

    /*
     * @see IJavaAnnotation#getId()
     */
    public int getId() {
      return isProblem() ? fProblem.getID() : -1;
    }

    /*
     * @see IJavaAnnotation#isProblem()
     */
    public boolean isProblem() {
      return fType == AnnotationType.WARNING || fType == AnnotationType.ERROR;
    }

    /*
     * @see IJavaAnnotation#isRelevant()
     */
    public boolean isRelevant() {
      return true;
    }

    /*
     * @see IJavaAnnotation#hasOverlay()
     */
    public boolean hasOverlay() {
      return false;
    }

    /*
     * @see IJavaAnnotation#addOverlaid(IJavaAnnotation)
     */
    public void addOverlaid(IJavaAnnotation annotation) {
      if (fOverlaids == null)
        fOverlaids = new ArrayList(1);
      fOverlaids.add(annotation);
    }

    /*
     * @see IJavaAnnotation#removeOverlaid(IJavaAnnotation)
     */
    public void removeOverlaid(IJavaAnnotation annotation) {
      if (fOverlaids != null) {
        fOverlaids.remove(annotation);
        if (fOverlaids.size() == 0)
          fOverlaids = null;
      }
    }

    /*
     * @see IJavaAnnotation#getOverlaidIterator()
     */
    public Iterator getOverlaidIterator() {
      if (fOverlaids != null)
        return fOverlaids.iterator();
      return null;
    }

    public AnnotationType getAnnotationType() {
      return fType;
    }
  };
  /**
  		 * Internal structure for mapping positions to some value. 
  		 * The reason for this specific structure is that positions can
  		 * change over time. Thus a lookup is based on value and not
  		 * on hash value.
  		 */
  protected static class ReverseMap {

    static class Entry {
      Position fPosition;
      Object fValue;
    }
    private int fAnchor = 0;

    private List fList = new ArrayList(2);

    public ReverseMap() {
    }

    public void clear() {
      fList.clear();
    }

    public Object get(Position position) {

      Entry entry;

      // behind anchor
      int length = fList.size();
      for (int i = fAnchor; i < length; i++) {
        entry = (Entry) fList.get(i);
        if (entry.fPosition.equals(position)) {
          fAnchor = i;
          return entry.fValue;
        }
      }

      // before anchor
      for (int i = 0; i < fAnchor; i++) {
        entry = (Entry) fList.get(i);
        if (entry.fPosition.equals(position)) {
          fAnchor = i;
          return entry.fValue;
        }
      }

      return null;
    }

    private int getIndex(Position position) {
      Entry entry;
      int length = fList.size();
      for (int i = 0; i < length; i++) {
        entry = (Entry) fList.get(i);
        if (entry.fPosition.equals(position))
          return i;
      }
      return -1;
    }

    public void put(Position position, Object value) {
      int index = getIndex(position);
      if (index == -1) {
        Entry entry = new Entry();
        entry.fPosition = position;
        entry.fValue = value;
        fList.add(entry);
      } else {
        Entry entry = (Entry) fList.get(index);
        entry.fValue = value;
      }
    }

    public void remove(Position position) {
      int index = getIndex(position);
      if (index > -1)
        fList.remove(index);
    }
  }

  /**
  		 * Document that can also be used by a background reconciler.
  		 */
  protected static class PartiallySynchronizedDocument extends Document {

    /*
     * @see IDocumentExtension#startSequentialRewrite(boolean)
     */
    synchronized public void startSequentialRewrite(boolean normalized) {
      super.startSequentialRewrite(normalized);
    }

    /*
     * @see IDocumentExtension#stopSequentialRewrite()
     */
    synchronized public void stopSequentialRewrite() {
      super.stopSequentialRewrite();
    }

    /*
     * @see IDocument#get()
     */
    synchronized public String get() {
      return super.get();
    }

    /*
     * @see IDocument#get(int, int)
     */
    synchronized public String get(int offset, int length) throws BadLocationException {
      return super.get(offset, length);
    }

    /*
     * @see IDocument#getChar(int)
     */
    synchronized public char getChar(int offset) throws BadLocationException {
      return super.getChar(offset);
    }

    /*
     * @see IDocument#replace(int, int, String)
     */
    synchronized public void replace(int offset, int length, String text) throws BadLocationException {
      super.replace(offset, length, text);
    }

    /*
     * @see IDocument#set(String)
     */
    synchronized public void set(String text) {
      super.set(text);
    }
  };
  //
  //  private static PHPPartitionScanner HTML_PARTITION_SCANNER = null;
  //
  //  private static PHPPartitionScanner PHP_PARTITION_SCANNER = null;
  //  private static PHPPartitionScanner SMARTY_PARTITION_SCANNER = null;
  //
  //  // private final static String[] TYPES= new String[] { PHPPartitionScanner.PHP, PHPPartitionScanner.JAVA_DOC, PHPPartitionScanner.JAVA_MULTILINE_COMMENT };
  //  private final static String[] TYPES =
  //    new String[] {
  //      IPHPPartitionScannerConstants.PHP,
  //      IPHPPartitionScannerConstants.PHP_MULTILINE_COMMENT,
  //      IPHPPartitionScannerConstants.HTML,
  //      IPHPPartitionScannerConstants.HTML_MULTILINE_COMMENT,
  //      IPHPPartitionScannerConstants.JAVASCRIPT,
  //      IPHPPartitionScannerConstants.CSS,
  //      IPHPPartitionScannerConstants.SMARTY,
  //      IPHPPartitionScannerConstants.SMARTY_MULTILINE_COMMENT };
  //  private static PHPPartitionScanner XML_PARTITION_SCANNER = null;

  /* Preference key for temporary problems */
  private final static String HANDLE_TEMPORARY_PROBLEMS = PreferenceConstants.EDITOR_EVALUTE_TEMPORARY_PROBLEMS;

  /** The buffer factory */
  private IBufferFactory fBufferFactory = new BufferFactory();
  /** Indicates whether the save has been initialized by this provider */
  private boolean fIsAboutToSave = false;
  /** The save policy used by this provider */
  private ISavePolicy fSavePolicy;
  /** Internal property changed listener */
  private IPropertyChangeListener fPropertyListener;

  /** annotation model listener added to all created CU annotation models */
  private GlobalAnnotationModelListener fGlobalAnnotationModelListener;

  public PHPDocumentProvider() {

    fPropertyListener = new IPropertyChangeListener() {
      public void propertyChange(PropertyChangeEvent event) {
        if (HANDLE_TEMPORARY_PROBLEMS.equals(event.getProperty()))
          enableHandlingTemporaryProblems();
      }
    };

    fGlobalAnnotationModelListener = new GlobalAnnotationModelListener();

    PHPeclipsePlugin.getDefault().getPreferenceStore().addPropertyChangeListener(fPropertyListener);

  }

  /**
   * Sets the document provider's save policy.
   */
  public void setSavePolicy(ISavePolicy savePolicy) {
    fSavePolicy = savePolicy;
  }

  /**
   * Creates a compilation unit from the given file.
   * 
   * @param file the file from which to create the compilation unit
   */
  protected ICompilationUnit createCompilationUnit(IFile file) {
    Object element = PHPCore.create(file);
    if (element instanceof ICompilationUnit)
      return (ICompilationUnit) element;
    return null;
  }

  /*
  	 * @see AbstractDocumentProvider#createElementInfo(Object)
  	 */
  protected ElementInfo createElementInfo(Object element) throws CoreException {

    if (!(element instanceof IFileEditorInput))
      return super.createElementInfo(element);

    IFileEditorInput input = (IFileEditorInput) element;
    ICompilationUnit original = createCompilationUnit(input.getFile());
    if (original != null) {

      try {

        try {
          refreshFile(input.getFile());
        } catch (CoreException x) {
          handleCoreException(x, PHPEditorMessages.getString("PHPDocumentProvider.error.createElementInfo")); //$NON-NLS-1$
        }

        IAnnotationModel m = createCompilationUnitAnnotationModel(input);
        IProblemRequestor r = m instanceof IProblemRequestor ? (IProblemRequestor) m : null;
        ICompilationUnit c = (ICompilationUnit) original.getSharedWorkingCopy(getProgressMonitor(), fBufferFactory, r);

        DocumentAdapter a = null;
        try {
          a = (DocumentAdapter) c.getBuffer();
        } catch (ClassCastException x) {
          IStatus status = new Status(IStatus.ERROR, PHPeclipsePlugin.PLUGIN_ID, PHPStatusConstants.TEMPLATE_IO_EXCEPTION, "Shared working copy has wrong buffer", x); //$NON-NLS-1$
          throw new CoreException(status);
        }

        _FileSynchronizer f = new _FileSynchronizer(input);
        f.install();

        CompilationUnitInfo info = new CompilationUnitInfo(a.getDocument(), m, f, c);
        info.setModificationStamp(computeModificationStamp(input.getFile()));
        info.fStatus = a.getStatus();
        info.fEncoding = getPersistedEncoding(input);

        if (r instanceof IProblemRequestorExtension) {
          IProblemRequestorExtension extension = (IProblemRequestorExtension) r;
          extension.setIsActive(isHandlingTemporaryProblems());
        }
        m.addAnnotationModelListener(fGlobalAnnotationModelListener);

        return info;

      } catch (JavaModelException x) {
        throw new CoreException(x.getStatus());
      }
    } else {
      return super.createElementInfo(element);
    }
  }

  /*
   * @see AbstractDocumentProvider#disposeElementInfo(Object, ElementInfo)
   */
  protected void disposeElementInfo(Object element, ElementInfo info) {

    if (info instanceof CompilationUnitInfo) {
      CompilationUnitInfo cuInfo = (CompilationUnitInfo) info;
      cuInfo.fCopy.destroy();
      cuInfo.fModel.removeAnnotationModelListener(fGlobalAnnotationModelListener);
    }

    super.disposeElementInfo(element, info);
  }

  /*
  	 * @see AbstractDocumentProvider#doSaveDocument(IProgressMonitor, Object, IDocument, boolean)
  	 */
  protected void doSaveDocument(IProgressMonitor monitor, Object element, IDocument document, boolean overwrite)
    throws CoreException {

    ElementInfo elementInfo = getElementInfo(element);
    if (elementInfo instanceof CompilationUnitInfo) {
      CompilationUnitInfo info = (CompilationUnitInfo) elementInfo;

      // update structure, assumes lock on info.fCopy
      info.fCopy.reconcile();

      ICompilationUnit original = (ICompilationUnit) info.fCopy.getOriginalElement();
      IResource resource = original.getResource();

      if (resource == null) {
        // underlying resource has been deleted, just recreate file, ignore the rest
        super.doSaveDocument(monitor, element, document, overwrite);
        return;
      }

      if (resource != null && !overwrite)
        checkSynchronizationState(info.fModificationStamp, resource);

      if (fSavePolicy != null)
        fSavePolicy.preSave(info.fCopy);

      // inform about the upcoming content change
      fireElementStateChanging(element);
      try {
        fIsAboutToSave = true;
        // commit working copy
        info.fCopy.commit(overwrite, monitor);
      } catch (CoreException x) {
        // inform about the failure
        fireElementStateChangeFailed(element);
        throw x;
      } catch (RuntimeException x) {
        // inform about the failure
        fireElementStateChangeFailed(element);
        throw x;
      } finally {
        fIsAboutToSave = false;
      }

      // If here, the dirty state of the editor will change to "not dirty".
      // Thus, the state changing flag will be reset.

      AbstractMarkerAnnotationModel model = (AbstractMarkerAnnotationModel) info.fModel;
      model.updateMarkers(info.fDocument);

      if (resource != null)
        info.setModificationStamp(computeModificationStamp(resource));

      if (fSavePolicy != null) {
        ICompilationUnit unit = fSavePolicy.postSave(original);
        if (unit != null) {
          IResource r = unit.getResource();
          IMarker[] markers = r.findMarkers(IMarker.MARKER, true, IResource.DEPTH_ZERO);
          if (markers != null && markers.length > 0) {
            for (int i = 0; i < markers.length; i++)
              model.updateMarker(markers[i], info.fDocument, null);
          }
        }
      }

    } else {
      super.doSaveDocument(monitor, element, document, overwrite);
    }
  }

  /**
   * Replaces createAnnotionModel of the super class.
   */
  protected IAnnotationModel createCompilationUnitAnnotationModel(Object element) throws CoreException {
		if ( !(element instanceof IFileEditorInput))
			throw new CoreException(PHPUIStatus.createError(
				IJavaModelStatusConstants.INVALID_RESOURCE_TYPE, "", null)); //$NON-NLS-1$
		
		IFileEditorInput input= (IFileEditorInput) element;
		return new CompilationUnitAnnotationModel(input);
  }

  //  private IDocumentPartitioner createCSSPartitioner() {
  //    return new DefaultPartitioner(getHTMLPartitionScanner(), TYPES);
  //  }

  /* (non-Javadoc)
   * Method declared on AbstractDocumentProvider
   */
  protected IDocument createDocument(Object element) throws CoreException {
    if (element instanceof IEditorInput) {
      Document document = new PartiallySynchronizedDocument();
      if (setDocumentContent(document, (IEditorInput) element, getEncoding(element))) {
        initializeDocument(document, (IEditorInput) element);

        //  	
        //    IDocument document = super.createDocument(element);
        //    if (document != null) {
        //        IDocumentPartitioner partitioner = null;
        //        if (element instanceof FileEditorInput) {
        //          IFile file = (IFile) ((FileEditorInput) element).getAdapter(IFile.class);
        //          String filename = file.getLocation().toString();
        //          String extension = filename.substring(filename.lastIndexOf("."), filename.length());
        //          //   System.out.println(extension);
        //          if (extension.equalsIgnoreCase(".html") || extension.equalsIgnoreCase(".htm")) {
        //            // html
        //            partitioner = createHTMLPartitioner();
        //          } else if (extension.equalsIgnoreCase(".xml")) {
        //            // xml
        //            partitioner = createXMLPartitioner();
        //          } else if (extension.equalsIgnoreCase(".js")) {
        //            // javascript
        //            partitioner = createJavaScriptPartitioner();
        //          } else if (extension.equalsIgnoreCase(".css")) {
        //            // cascading style sheets
        //            partitioner = createCSSPartitioner();
        //          } else if (extension.equalsIgnoreCase(".tpl")) {
        //            // smarty ?
        //            partitioner = createSmartyPartitioner();
        //          } else if (extension.equalsIgnoreCase(".inc")) {
        //            // php include files ?
        //            partitioner = createIncludePartitioner();
        //          }
        //        }
        //
        //        if (partitioner == null) {
        //          partitioner = createPHPPartitioner();
        //        }
        //        document.setDocumentPartitioner(partitioner);
        //        partitioner.connect(document);
      }
      return document;
    }
    return null;
  }

  //  /**
  //   * Return a partitioner for .html files.
  //   */
  //  private IDocumentPartitioner createHTMLPartitioner() {
  //    return new DefaultPartitioner(getHTMLPartitionScanner(), TYPES);
  //  }
  //
  //  private IDocumentPartitioner createIncludePartitioner() {
  //    return new DefaultPartitioner(getPHPPartitionScanner(), TYPES);
  //  }
  //
  //  private IDocumentPartitioner createJavaScriptPartitioner() {
  //    return new DefaultPartitioner(getHTMLPartitionScanner(), TYPES);
  //  }

  /**
   * Creates a line tracker working with the same line delimiters as the document
   * of the given element. Assumes the element to be managed by this document provider.
   * 
   * @param element the element serving as blue print
   * @return a line tracker based on the same line delimiters as the element's document
   */
  public ILineTracker createLineTracker(Object element) {
    return new DefaultLineTracker();
  }

  //  /**
  //   * Return a partitioner for .php files.
  //   */
  //  private IDocumentPartitioner createPHPPartitioner() {
  //    return new DefaultPartitioner(getPHPPartitionScanner(), TYPES);
  //  }
  //
  //  private IDocumentPartitioner createSmartyPartitioner() {
  //    return new DefaultPartitioner(getSmartyPartitionScanner(), TYPES);
  //  }
  //
  //  private IDocumentPartitioner createXMLPartitioner() {
  //    return new DefaultPartitioner(getXMLPartitionScanner(), TYPES);
  //  }
  //
  //  /**
  //   * Return a scanner for creating html partitions.
  //   */
  //  private PHPPartitionScanner getHTMLPartitionScanner() {
  //    if (HTML_PARTITION_SCANNER == null)
  //      HTML_PARTITION_SCANNER = new PHPPartitionScanner(IPHPPartitionScannerConstants.HTML_FILE);
  //    return HTML_PARTITION_SCANNER;
  //  }
  //  /**
  //   * Return a scanner for creating php partitions.
  //   */
  //  private PHPPartitionScanner getPHPPartitionScanner() {
  //    if (PHP_PARTITION_SCANNER == null)
  //      PHP_PARTITION_SCANNER = new PHPPartitionScanner(IPHPPartitionScannerConstants.PHP_FILE);
  //    return PHP_PARTITION_SCANNER;
  //  }
  //
  //  /**
  //   * Return a scanner for creating smarty partitions.
  //   */
  //  private PHPPartitionScanner getSmartyPartitionScanner() {
  //    if (SMARTY_PARTITION_SCANNER == null)
  //      SMARTY_PARTITION_SCANNER = new PHPPartitionScanner(IPHPPartitionScannerConstants.SMARTY_FILE);
  //    return SMARTY_PARTITION_SCANNER;
  //  }
  //
  //  /**
  //   * Return a scanner for creating xml partitions.
  //   */
  //  private PHPPartitionScanner getXMLPartitionScanner() {
  //    if (XML_PARTITION_SCANNER == null)
  //      XML_PARTITION_SCANNER = new PHPPartitionScanner(IPHPPartitionScannerConstants.XML_FILE);
  //    return XML_PARTITION_SCANNER;
  //  }

  protected void initializeDocument(IDocument document, IEditorInput editorInput) {
    if (document != null) {
      JavaTextTools tools = PHPeclipsePlugin.getDefault().getJavaTextTools();
      IDocumentPartitioner partitioner = null;
      if (editorInput != null && editorInput instanceof FileEditorInput) {
        IFile file = (IFile) ((FileEditorInput) editorInput).getAdapter(IFile.class);
        String filename = file.getLocation().toString();
        String extension = filename.substring(filename.lastIndexOf("."), filename.length());
        partitioner = tools.createDocumentPartitioner(extension);
      } else {
        partitioner = tools.createDocumentPartitioner(".php");
      }
      document.setDocumentPartitioner(partitioner);
      partitioner.connect(document);
    }
  }

  /*
   * @see AbstractDocumentProvider#resetDocument(Object)
   */
  public void resetDocument(Object element) throws CoreException {
    if (element == null)
      return;

    ElementInfo elementInfo = getElementInfo(element);
    if (elementInfo instanceof CompilationUnitInfo) {
      CompilationUnitInfo info = (CompilationUnitInfo) elementInfo;

      IDocument document;
      IStatus status = null;

      try {

        ICompilationUnit original = (ICompilationUnit) info.fCopy.getOriginalElement();
        IResource resource = original.getResource();
        if (resource instanceof IFile) {

          IFile file = (IFile) resource;

          try {
            refreshFile(file);
          } catch (CoreException x) {
            handleCoreException(x, PHPEditorMessages.getString("PHPDocumentProvider.error.resetDocument")); //$NON-NLS-1$
          }

          IFileEditorInput input = new FileEditorInput(file);
          document = super.createDocument(input);

        } else {
          document = new Document();
        }

      } catch (CoreException x) {
        document = new Document();
        status = x.getStatus();
      }

      fireElementContentAboutToBeReplaced(element);

      removeUnchangedElementListeners(element, info);
      info.fDocument.set(document.get());
      info.fCanBeSaved = false;
      info.fStatus = status;
      addUnchangedElementListeners(element, info);

      fireElementContentReplaced(element);
      fireElementDirtyStateChanged(element, false);

    } else {
      super.resetDocument(element);
    }
  }
  /**
  	 * Saves the content of the given document to the given element.
  	 * This is only performed when this provider initiated the save.
  	 * 
  	 * @param monitor the progress monitor
  	 * @param element the element to which to save
  	 * @param document the document to save
  	 * @param overwrite <code>true</code> if the save should be enforced
  	 */
  public void saveDocumentContent(IProgressMonitor monitor, Object element, IDocument document, boolean overwrite)
    throws CoreException {

    if (!fIsAboutToSave)
      return;

    if (element instanceof IFileEditorInput) {
      IFileEditorInput input = (IFileEditorInput) element;
      try {
        String encoding = getEncoding(element);
        if (encoding == null)
          encoding = ResourcesPlugin.getEncoding();
        InputStream stream = new ByteArrayInputStream(document.get().getBytes(encoding));
        IFile file = input.getFile();
        file.setContents(stream, overwrite, true, monitor);
      } catch (IOException x) {
        IStatus s = new Status(IStatus.ERROR, PHPeclipsePlugin.PLUGIN_ID, IStatus.OK, x.getMessage(), x);
        throw new CoreException(s);
      }
    }
  }
  /**
   * Returns the underlying resource for the given element.
   * 
   * @param the element
   * @return the underlying resource of the given element
   */
  public IResource getUnderlyingResource(Object element) {
    if (element instanceof IFileEditorInput) {
      IFileEditorInput input = (IFileEditorInput) element;
      return input.getFile();
    }
    return null;
  }

  /**
   * Returns the working copy this document provider maintains for the given
   * element.
   * 
   * @param element the given element
   * @return the working copy for the given element
   */
  ICompilationUnit getWorkingCopy(IEditorInput element) {

    ElementInfo elementInfo = getElementInfo(element);
    if (elementInfo instanceof CompilationUnitInfo) {
      CompilationUnitInfo info = (CompilationUnitInfo) elementInfo;
      return info.fCopy;
    }

    return null;
  }

  /**
   * Gets the BufferFactory.
   */
  public IBufferFactory getBufferFactory() {
    return fBufferFactory;
  }

  /**
   * Shuts down this document provider.
   */
  public void shutdown() {

    PHPeclipsePlugin.getDefault().getPreferenceStore().removePropertyChangeListener(fPropertyListener);

    Iterator e = getConnectedElements();
    while (e.hasNext())
      disconnect(e.next());
  }

  /**
   * Returns the preference whether handling temporary problems is enabled.
   */
  protected boolean isHandlingTemporaryProblems() {
    IPreferenceStore store = PHPeclipsePlugin.getDefault().getPreferenceStore();
    return store.getBoolean(HANDLE_TEMPORARY_PROBLEMS);
  }

  /**
   * Switches the state of problem acceptance according to the value in the preference store.
   */
  protected void enableHandlingTemporaryProblems() {
    boolean enable = isHandlingTemporaryProblems();
    for (Iterator iter = getConnectedElements(); iter.hasNext();) {
      ElementInfo element = getElementInfo(iter.next());
      if (element instanceof CompilationUnitInfo) {
        CompilationUnitInfo info = (CompilationUnitInfo) element;
        if (info.fModel instanceof IProblemRequestorExtension) {
          IProblemRequestorExtension extension = (IProblemRequestorExtension) info.fModel;
          extension.setIsActive(enable);
        }
      }
    }
  }

  /**
   * Adds a listener that reports changes from all compilation unit annotation models.
   */
  public void addGlobalAnnotationModelListener(IAnnotationModelListener listener) {
    fGlobalAnnotationModelListener.addListener(listener);
  }

  /**
   * Removes the listener.
   */
  public void removeGlobalAnnotationModelListener(IAnnotationModelListener listener) {
    fGlobalAnnotationModelListener.removeListener(listener);
  }

  /**
   * Returns whether the given element is connected to this document provider.
   * 
   * @param element the element
   * @return <code>true</code> if the element is connected, <code>false</code> otherwise
   */
  boolean isConnected(Object element) {
    return getElementInfo(element) != null;
  }
}