/*******************************************************************************
* Copyright (c) 2005, 2017 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
*******************************************************************************/
package org.eclipse.dltk.internal.ui.editor;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import org.eclipse.core.filebuffers.FileBuffers;
import org.eclipse.core.filebuffers.ITextFileBuffer;
import org.eclipse.core.filebuffers.ITextFileBufferManager;
import org.eclipse.core.filebuffers.LocationKind;
import org.eclipse.core.filesystem.IFileStore;
import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.runtime.Assert;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.NullProgressMonitor;
import org.eclipse.core.runtime.Status;
import org.eclipse.dltk.core.BufferChangedEvent;
import org.eclipse.dltk.core.IBuffer;
import org.eclipse.dltk.core.IBufferChangedListener;
import org.eclipse.dltk.core.IOpenable;
import org.eclipse.dltk.core.ModelException;
import org.eclipse.dltk.ui.DLTKUIPlugin;
import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.DefaultLineTracker;
import org.eclipse.jface.text.DocumentEvent;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.IDocumentListener;
import org.eclipse.jface.text.ISynchronizable;
import org.eclipse.swt.widgets.Display;
/**
* Adapts <code>IDocument</code> to <code>IBuffer</code>. Uses the same
* algorithm as the text widget to determine the buffer's line delimiter. All
* text inserted into the buffer is converted to this line delimiter. This class
* is <code>public</code> for test purposes only.
*/
public class DocumentAdapter implements IBuffer, IDocumentListener {
/**
* Internal implementation of a NULL instanceof IBuffer.
*/
static private class NullBuffer implements IBuffer {
@Override
public void addBufferChangedListener(IBufferChangedListener listener) {
}
@Override
public void append(char[] text) {
}
@Override
public void append(String text) {
}
@Override
public void close() {
}
@Override
public char getChar(int position) {
return 0;
}
@Override
public char[] getCharacters() {
return null;
}
@Override
public String getContents() {
return null;
}
@Override
public int getLength() {
return 0;
}
@Override
public IOpenable getOwner() {
return null;
}
@Override
public String getText(int offset, int length) {
return null;
}
@Override
public IResource getUnderlyingResource() {
return null;
}
@Override
public boolean hasUnsavedChanges() {
return false;
}
@Override
public boolean isClosed() {
return false;
}
@Override
public boolean isReadOnly() {
return true;
}
@Override
public void removeBufferChangedListener(
IBufferChangedListener listener) {
}
@Override
public void replace(int position, int length, char[] text) {
}
@Override
public void replace(int position, int length, String text) {
}
@Override
public void save(IProgressMonitor progress, boolean force)
throws ModelException {
}
@Override
public void setContents(char[] contents) {
}
@Override
public void setContents(String contents) {
}
}
/** NULL implementing <code>IBuffer</code> */
public final static IBuffer NULL = new NullBuffer();
/*
*
*/
private IPath fPath;
/**
* Executes a document set content call in the ui thread.
*/
protected class DocumentSetCommand implements Runnable {
private String fContents;
@Override
public void run() {
fDocument.set(fContents);
}
public void set(String contents) {
fContents = contents;
// Display.getDefault().syncExec(this);
DocumentAdapter.run(this);
}
}
/**
* Executes a document replace call in the ui thread.
*/
protected class DocumentReplaceCommand implements Runnable {
private int fOffset;
private int fLength;
private String fText;
@Override
public void run() {
try {
fDocument.replace(fOffset, fLength, fText);
} catch (BadLocationException x) {
// ignore
}
}
public void replace(int offset, int length, String text) {
fOffset = offset;
fLength = length;
fText = text;
Display.getDefault().syncExec(this);
}
}
private static final boolean DEBUG_LINE_DELIMITERS = true;
private IOpenable fOwner;
private IFile fFile;
private ITextFileBuffer fTextFileBuffer;
private IDocument fDocument;
private DocumentSetCommand fSetCmd = new DocumentSetCommand();
private DocumentReplaceCommand fReplaceCmd = new DocumentReplaceCommand();
private Set<String> fLegalLineDelimiters;
private List<IBufferChangedListener> fBufferListeners = new ArrayList<>(3);
private IStatus fStatus;
/** @since 4.0 */
private LocationKind fLocationKind;
/** @since 4.0 */
private IFileStore fFileStore;
/**
* Constructs a new document adapter.
*/
public DocumentAdapter(IOpenable owner, IFile file) {
fOwner = owner;
fFile = file;
fPath = fFile.getFullPath();
fLocationKind = LocationKind.IFILE;
initialize();
}
/**
* Constructs a new document adapter.
*
*
*/
public DocumentAdapter(IOpenable owner, IPath path) {
Assert.isLegal(path != null);
fOwner = owner;
fPath = path;
fLocationKind = LocationKind.NORMALIZE;
initialize();
}
/**
* Constructs a new document adapter.
*
* @param owner
* the owner of this buffer
* @param fileStore
* the file store of the file that backs the buffer
* @param path
* the path of the file that backs the buffer
* @since 4.0
*/
public DocumentAdapter(IOpenable owner, IFileStore fileStore, IPath path) {
Assert.isLegal(fileStore != null);
Assert.isLegal(path != null);
fOwner = owner;
fFileStore = fileStore;
fPath = path;
fLocationKind = LocationKind.NORMALIZE;
initialize();
}
private void initialize() {
ITextFileBufferManager manager = FileBuffers.getTextFileBufferManager();
try {
if (fFileStore != null) {
manager.connectFileStore(fFileStore, new NullProgressMonitor());
fTextFileBuffer = manager
.getFileStoreTextFileBuffer(fFileStore);
} else {
manager.connect(fPath, fLocationKind,
new NullProgressMonitor());
fTextFileBuffer = manager.getTextFileBuffer(fPath,
fLocationKind);
}
fDocument = fTextFileBuffer.getDocument();
} catch (CoreException x) {
fStatus = x.getStatus();
fDocument = manager.createEmptyDocument(fPath,
LocationKind.NORMALIZE);
if (fDocument instanceof ISynchronizable)
((ISynchronizable) fDocument).setLockObject(new Object());
}
fDocument.addPrenotifiedDocumentListener(this);
}
/**
* Returns the status of this document adapter.
*/
public IStatus getStatus() {
if (fStatus != null)
return fStatus;
if (fTextFileBuffer != null)
return fTextFileBuffer.getStatus();
return null;
}
/**
* Returns the adapted document.
*
* @return the adapted document
*/
public IDocument getDocument() {
return fDocument;
}
/*
* @see IBuffer#addBufferChangedListener(IBufferChangedListener)
*/
@Override
public void addBufferChangedListener(IBufferChangedListener listener) {
Assert.isNotNull(listener);
if (!fBufferListeners.contains(listener))
fBufferListeners.add(listener);
}
/*
* @see IBuffer#removeBufferChangedListener(IBufferChangedListener)
*/
@Override
public void removeBufferChangedListener(IBufferChangedListener listener) {
Assert.isNotNull(listener);
fBufferListeners.remove(listener);
}
@Override
public void append(char[] text) {
append(new String(text));
}
@Override
public void append(String text) {
if (DEBUG_LINE_DELIMITERS) {
validateLineDelimiters(text);
}
fReplaceCmd.replace(fDocument.getLength(), 0, text);
}
@Override
public void close() {
if (isClosed())
return;
IDocument d = fDocument;
fDocument = null;
d.removePrenotifiedDocumentListener(this);
if (fTextFileBuffer != null) {
ITextFileBufferManager manager = FileBuffers
.getTextFileBufferManager();
try {
if (fFileStore != null)
manager.disconnectFileStore(fFileStore,
new NullProgressMonitor());
else
manager.disconnect(fPath, fLocationKind,
new NullProgressMonitor());
} catch (CoreException x) {
// ignore
}
fTextFileBuffer = null;
}
fireBufferChanged(new BufferChangedEvent(this, 0, 0, null));
fBufferListeners.clear();
}
@Override
public char getChar(int position) {
try {
return fDocument.getChar(position);
} catch (BadLocationException x) {
throw new ArrayIndexOutOfBoundsException();
}
}
@Override
public char[] getCharacters() {
String content = getContents();
return content == null ? null : content.toCharArray();
}
@Override
public String getContents() {
return fDocument.get();
}
@Override
public int getLength() {
return fDocument.getLength();
}
@Override
public IOpenable getOwner() {
return fOwner;
}
@Override
public String getText(int offset, int length) {
try {
return fDocument.get(offset, length);
} catch (BadLocationException x) {
throw new ArrayIndexOutOfBoundsException();
}
}
@Override
public IResource getUnderlyingResource() {
return fFile;
}
@Override
public boolean hasUnsavedChanges() {
return fTextFileBuffer != null ? fTextFileBuffer.isDirty() : false;
}
@Override
public boolean isClosed() {
return fDocument == null;
}
@Override
public boolean isReadOnly() {
IResource resource = getUnderlyingResource();
return resource == null ? true
: resource.getResourceAttributes().isReadOnly();
}
@Override
public void replace(int position, int length, char[] text) {
replace(position, length, new String(text));
}
@Override
public void replace(int position, int length, String text) {
if (DEBUG_LINE_DELIMITERS) {
validateLineDelimiters(text);
}
fReplaceCmd.replace(position, length, text);
}
@Override
public void save(IProgressMonitor progress, boolean force)
throws ModelException {
try {
if (fTextFileBuffer != null)
fTextFileBuffer.commit(progress, force);
} catch (CoreException e) {
throw new ModelException(e);
}
}
@Override
public void setContents(char[] contents) {
setContents(new String(contents));
}
@Override
public void setContents(String contents) {
int oldLength = fDocument.getLength();
if (contents == null) {
if (oldLength != 0)
fSetCmd.set(""); //$NON-NLS-1$
} else {
// set only if different
if (DEBUG_LINE_DELIMITERS) {
validateLineDelimiters(contents);
}
if (!contents.equals(fDocument.get()))
fSetCmd.set(contents);
}
}
private void validateLineDelimiters(String contents) {
if (fLegalLineDelimiters == null) {
// collect all line delimiters in the document
HashSet<String> existingDelimiters = new HashSet<>();
for (int i = fDocument.getNumberOfLines() - 1; i >= 0; i--) {
try {
String curr = fDocument.getLineDelimiter(i);
if (curr != null) {
existingDelimiters.add(curr);
}
} catch (BadLocationException e) {
DLTKUIPlugin.log(e);
}
}
if (existingDelimiters.isEmpty()) {
return; // first insertion of a line delimiter: no test
}
fLegalLineDelimiters = existingDelimiters;
}
DefaultLineTracker tracker = new DefaultLineTracker();
tracker.set(contents);
int lines = tracker.getNumberOfLines();
if (lines <= 1)
return;
for (int i = 0; i < lines; i++) {
try {
String curr = tracker.getLineDelimiter(i);
if (curr != null && !fLegalLineDelimiters.contains(curr)) {
StringBuffer buf = new StringBuffer(
"WARNING: DocumentAdapter added new line delimiter to code: "); //$NON-NLS-1$
for (int k = 0; k < curr.length(); k++) {
if (k > 0)
buf.append(' ');
buf.append((int) curr.charAt(k));
}
IStatus status = new Status(IStatus.WARNING,
DLTKUIPlugin.PLUGIN_ID, IStatus.OK, buf.toString(),
new Throwable());
DLTKUIPlugin.log(status);
}
} catch (BadLocationException e) {
DLTKUIPlugin.log(e);
}
}
}
@Override
public void documentAboutToBeChanged(DocumentEvent event) {
// there is nothing to do here
}
@Override
public void documentChanged(DocumentEvent event) {
fireBufferChanged(new BufferChangedEvent(this, event.getOffset(),
event.getLength(), event.getText()));
}
private void fireBufferChanged(BufferChangedEvent event) {
if (fBufferListeners != null && fBufferListeners.size() > 0) {
Iterator<IBufferChangedListener> e = new ArrayList<>(
fBufferListeners).iterator();
while (e.hasNext())
e.next().bufferChanged(event);
}
}
/**
* Run the given runnable in the UI thread.
*
* @param runnable
* the runnable
* @since 3.3
*/
private static final void run(Runnable runnable) {
Display currentDisplay = Display.getCurrent();
if (currentDisplay != null)
runnable.run();
else
Display.getDefault().syncExec(runnable);
}
}