/*******************************************************************************
* Copyright (c) 2000, 2008 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
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.wst.jsdt.internal.ui.javaeditor;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.core.runtime.jobs.Job;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.ITextInputListener;
import org.eclipse.jface.text.Position;
import org.eclipse.jface.text.TextPresentation;
import org.eclipse.jface.text.source.ISourceViewer;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.IWorkbenchPartSite;
import org.eclipse.wst.jsdt.core.IJavaScriptElement;
import org.eclipse.wst.jsdt.core.dom.ASTNode;
import org.eclipse.wst.jsdt.core.dom.BooleanLiteral;
import org.eclipse.wst.jsdt.core.dom.CharacterLiteral;
import org.eclipse.wst.jsdt.core.dom.JavaScriptUnit;
import org.eclipse.wst.jsdt.core.dom.Expression;
import org.eclipse.wst.jsdt.core.dom.NumberLiteral;
import org.eclipse.wst.jsdt.core.dom.RegularExpressionLiteral;
import org.eclipse.wst.jsdt.core.dom.SimpleName;
import org.eclipse.wst.jsdt.internal.corext.dom.GenericVisitor;
import org.eclipse.wst.jsdt.internal.ui.JavaScriptPlugin;
import org.eclipse.wst.jsdt.internal.ui.javaeditor.SemanticHighlightingManager.HighlightedPosition;
import org.eclipse.wst.jsdt.internal.ui.javaeditor.SemanticHighlightingManager.Highlighting;
import org.eclipse.wst.jsdt.internal.ui.text.java.IJavaReconcilingListener;
/**
* Semantic highlighting reconciler - Background thread implementation.
*
*
*/
public class SemanticHighlightingReconciler implements IJavaReconcilingListener, ITextInputListener {
/**
* Collects positions from the AST.
*/
private class PositionCollector extends GenericVisitor {
/** The semantic token */
private SemanticToken fToken= new SemanticToken();
/*
* @see org.eclipse.wst.jsdt.internal.corext.dom.GenericVisitor#visitNode(org.eclipse.wst.jsdt.core.dom.ASTNode)
*/
protected boolean visitNode(ASTNode node) {
if ((node.getFlags() & ASTNode.MALFORMED) == ASTNode.MALFORMED) {
retainPositions(node.getStartPosition(), node.getLength());
return false;
}
return true;
}
/*
* @see org.eclipse.wst.jsdt.core.dom.ASTVisitor#visit(org.eclipse.wst.jsdt.core.dom.BooleanLiteral)
*/
public boolean visit(BooleanLiteral node) {
return visitLiteral(node);
}
/*
* @see org.eclipse.wst.jsdt.core.dom.ASTVisitor#visit(org.eclipse.wst.jsdt.core.dom.CharacterLiteral)
*/
public boolean visit(CharacterLiteral node) {
return visitLiteral(node);
}
public boolean visit(RegularExpressionLiteral node) {
return visitLiteral(node);
}
/*
* @see org.eclipse.wst.jsdt.core.dom.ASTVisitor#visit(org.eclipse.wst.jsdt.core.dom.NumberLiteral)
*/
public boolean visit(NumberLiteral node) {
return visitLiteral(node);
}
private boolean visitLiteral(Expression node) {
fToken.update(node);
for (int i= 0, n= fJobSemanticHighlightings.length; i < n; i++) {
SemanticHighlighting semanticHighlighting= fJobSemanticHighlightings[i];
if (fJobHighlightings[i].isEnabled() && semanticHighlighting.consumesLiteral(fToken)) {
int offset= node.getStartPosition();
int length= node.getLength();
if (offset > -1 && length > 0)
addPosition(offset, length, fJobHighlightings[i]);
break;
}
}
fToken.clear();
return false;
}
/*
* @see org.eclipse.wst.jsdt.core.dom.ASTVisitor#visit(org.eclipse.wst.jsdt.core.dom.SimpleName)
*/
public boolean visit(SimpleName node) {
fToken.update(node);
for (int i= 0, n= fJobSemanticHighlightings.length; i < n; i++) {
SemanticHighlighting semanticHighlighting= fJobSemanticHighlightings[i];
if (fJobHighlightings[i].isEnabled() && semanticHighlighting.consumes(fToken)) {
int offset= node.getStartPosition();
int length= node.getLength();
if (offset > -1 && length > 0)
addPosition(offset, length, fJobHighlightings[i]);
break;
}
}
fToken.clear();
return false;
}
/**
* Add a position with the given range and highlighting iff it does not exist already.
* @param offset The range offset
* @param length The range length
* @param highlighting The highlighting
*/
private void addPosition(int offset, int length, Highlighting highlighting) {
boolean isExisting= false;
// TODO: use binary search
for (int i= 0, n= fRemovedPositions.size(); i < n; i++) {
HighlightedPosition position= (HighlightedPosition) fRemovedPositions.get(i);
if (position == null)
continue;
if (position.isEqual(offset, length, highlighting)) {
isExisting= true;
fRemovedPositions.set(i, null);
fNOfRemovedPositions--;
break;
}
}
if (!isExisting) {
Position position= fJobPresenter.createHighlightedPosition(offset, length, highlighting);
fAddedPositions.add(position);
}
}
/**
* Retain the positions completely contained in the given range.
* @param offset The range offset
* @param length The range length
*/
private void retainPositions(int offset, int length) {
// TODO: use binary search
for (int i= 0, n= fRemovedPositions.size(); i < n; i++) {
HighlightedPosition position= (HighlightedPosition) fRemovedPositions.get(i);
if (position != null && position.isContained(offset, length)) {
fRemovedPositions.set(i, null);
fNOfRemovedPositions--;
}
}
}
}
/** Position collector */
private PositionCollector fCollector= new PositionCollector();
/** The Java editor this semantic highlighting reconciler is installed on */
private JavaEditor fEditor;
/** The source viewer this semantic highlighting reconciler is installed on */
private ISourceViewer fSourceViewer;
/** The semantic highlighting presenter */
private SemanticHighlightingPresenter fPresenter;
/** Semantic highlightings */
private SemanticHighlighting[] fSemanticHighlightings;
/** Highlightings */
private Highlighting[] fHighlightings;
/** Background job's added highlighted positions */
private List fAddedPositions= new ArrayList();
/** Background job's removed highlighted positions */
private List fRemovedPositions= new ArrayList();
/** Number of removed positions */
private int fNOfRemovedPositions;
/** Background job */
private Job fJob;
/** Background job lock */
private final Object fJobLock= new Object();
/**
* Reconcile operation lock.
*
*/
private final Object fReconcileLock= new Object();
/**
* <code>true</code> if any thread is executing
* <code>reconcile</code>, <code>false</code> otherwise.
*
*/
private boolean fIsReconciling= false;
/** The semantic highlighting presenter - cache for background thread, only valid during {@link #reconciled(JavaScriptUnit, boolean, IProgressMonitor)} */
private SemanticHighlightingPresenter fJobPresenter;
/** Semantic highlightings - cache for background thread, only valid during {@link #reconciled(JavaScriptUnit, boolean, IProgressMonitor)} */
private SemanticHighlighting[] fJobSemanticHighlightings;
/** Highlightings - cache for background thread, only valid during {@link #reconciled(JavaScriptUnit, boolean, IProgressMonitor)} */
private Highlighting[] fJobHighlightings;
/*
* @see org.eclipse.wst.jsdt.internal.ui.text.java.IJavaReconcilingListener#aboutToBeReconciled()
*/
public void aboutToBeReconciled() {
// Do nothing
}
/*
* @see org.eclipse.wst.jsdt.internal.ui.text.java.IJavaReconcilingListener#reconciled(JavaScriptUnit, boolean, IProgressMonitor)
*/
public void reconciled(JavaScriptUnit ast, boolean forced, IProgressMonitor progressMonitor) {
// ensure at most one thread can be reconciling at any time
synchronized (fReconcileLock) {
if (fIsReconciling)
return;
else
fIsReconciling= true;
}
fJobPresenter= fPresenter;
fJobSemanticHighlightings= fSemanticHighlightings;
fJobHighlightings= fHighlightings;
try {
if (fJobPresenter == null || fJobSemanticHighlightings == null || fJobHighlightings == null)
return;
fJobPresenter.setCanceled(progressMonitor.isCanceled());
if (ast == null || fJobPresenter.isCanceled())
return;
ASTNode[] subtrees= getAffectedSubtrees(ast);
if (subtrees.length == 0)
return;
startReconcilingPositions();
if (!fJobPresenter.isCanceled())
reconcilePositions(subtrees);
TextPresentation textPresentation= null;
if (!fJobPresenter.isCanceled())
textPresentation= fJobPresenter.createPresentation(fAddedPositions, fRemovedPositions);
if (!fJobPresenter.isCanceled())
updatePresentation(textPresentation, fAddedPositions, fRemovedPositions);
stopReconcilingPositions();
} finally {
fJobPresenter= null;
fJobSemanticHighlightings= null;
fJobHighlightings= null;
synchronized (fReconcileLock) {
fIsReconciling= false;
}
}
}
/**
* @param node Root node
* @return Array of subtrees that may be affected by past document changes
*/
private ASTNode[] getAffectedSubtrees(ASTNode node) {
// TODO: only return nodes which are affected by document changes - would require an 'anchor' concept for taking distant effects into account
return new ASTNode[] { node };
}
/**
* Start reconciling positions.
*/
private void startReconcilingPositions() {
fJobPresenter.addAllPositions(fRemovedPositions);
fNOfRemovedPositions= fRemovedPositions.size();
}
/**
* Reconcile positions based on the AST subtrees
*
* @param subtrees the AST subtrees
*/
private void reconcilePositions(ASTNode[] subtrees) {
// FIXME: remove positions not covered by subtrees
for (int i= 0, n= subtrees.length; i < n; i++)
subtrees[i].accept(fCollector);
List oldPositions= fRemovedPositions;
List newPositions= new ArrayList(fNOfRemovedPositions);
for (int i= 0, n= oldPositions.size(); i < n; i ++) {
Object current= oldPositions.get(i);
if (current != null)
newPositions.add(current);
}
fRemovedPositions= newPositions;
}
/**
* Update the presentation.
*
* @param textPresentation the text presentation
* @param addedPositions the added positions
* @param removedPositions the removed positions
*/
private void updatePresentation(TextPresentation textPresentation, List addedPositions, List removedPositions) {
Runnable runnable= fJobPresenter.createUpdateRunnable(textPresentation, addedPositions, removedPositions);
if (runnable == null)
return;
JavaEditor editor= fEditor;
if (editor == null)
return;
IWorkbenchPartSite site= editor.getSite();
if (site == null)
return;
Shell shell= site.getShell();
if (shell == null || shell.isDisposed())
return;
Display display= shell.getDisplay();
if (display == null || display.isDisposed())
return;
display.asyncExec(runnable);
}
/**
* Stop reconciling positions.
*/
private void stopReconcilingPositions() {
fRemovedPositions.clear();
fNOfRemovedPositions= 0;
fAddedPositions.clear();
}
/**
* Install this reconciler on the given editor, presenter and highlightings.
* @param editor the editor
* @param sourceViewer the source viewer
* @param presenter the semantic highlighting presenter
* @param semanticHighlightings the semantic highlightings
* @param highlightings the highlightings
*/
public void install(JavaEditor editor, ISourceViewer sourceViewer, SemanticHighlightingPresenter presenter, SemanticHighlighting[] semanticHighlightings, Highlighting[] highlightings) {
fPresenter= presenter;
fSemanticHighlightings= semanticHighlightings;
fHighlightings= highlightings;
fEditor= editor;
fSourceViewer= sourceViewer;
if (fEditor instanceof CompilationUnitEditor) {
((CompilationUnitEditor)fEditor).addReconcileListener(this);
} else if (fEditor == null) {
fSourceViewer.addTextInputListener(this);
scheduleJob();
}
}
/**
* Uninstall this reconciler from the editor
*/
public void uninstall() {
if (fPresenter != null)
fPresenter.setCanceled(true);
if (fEditor != null) {
if (fEditor instanceof CompilationUnitEditor)
((CompilationUnitEditor)fEditor).removeReconcileListener(this);
else
fSourceViewer.removeTextInputListener(this);
fEditor= null;
}
fSourceViewer= null;
fSemanticHighlightings= null;
fHighlightings= null;
fPresenter= null;
}
/**
* Schedule a background job for retrieving the AST and reconciling the Semantic Highlighting model.
*/
private void scheduleJob() {
final IJavaScriptElement element= fEditor.getInputJavaElement();
synchronized (fJobLock) {
final Job oldJob= fJob;
if (fJob != null) {
fJob.cancel();
fJob= null;
}
if (element != null) {
fJob= new Job(JavaEditorMessages.SemanticHighlighting_job) {
protected IStatus run(IProgressMonitor monitor) {
if (oldJob != null) {
try {
oldJob.join();
} catch (InterruptedException e) {
JavaScriptPlugin.log(e);
return Status.CANCEL_STATUS;
}
}
if (monitor.isCanceled())
return Status.CANCEL_STATUS;
JavaScriptUnit ast= JavaScriptPlugin.getDefault().getASTProvider().getAST(element, ASTProvider.WAIT_YES, monitor);
reconciled(ast, false, monitor);
synchronized (fJobLock) {
// allow the job to be gc'ed
if (fJob == this)
fJob= null;
}
return Status.OK_STATUS;
}
};
fJob.setSystem(true);
fJob.setPriority(Job.DECORATE);
fJob.schedule();
}
}
}
/*
* @see org.eclipse.jface.text.ITextInputListener#inputDocumentAboutToBeChanged(org.eclipse.jface.text.IDocument, org.eclipse.jface.text.IDocument)
*/
public void inputDocumentAboutToBeChanged(IDocument oldInput, IDocument newInput) {
synchronized (fJobLock) {
if (fJob != null) {
fJob.cancel();
fJob= null;
}
}
}
/*
* @see org.eclipse.jface.text.ITextInputListener#inputDocumentChanged(org.eclipse.jface.text.IDocument, org.eclipse.jface.text.IDocument)
*/
public void inputDocumentChanged(IDocument oldInput, IDocument newInput) {
if (newInput != null)
scheduleJob();
}
/**
* Refreshes the highlighting.
*
*
*/
public void refresh() {
scheduleJob();
}
}