ant/org.eclipse.ant.ui/Ant Editor/org/eclipse/ant/internal/ui/editor/text/XMLTextHover.java - platform/eclipse.platform - Git at Google

 /*******************************************************************************
  * Copyright (c) 2000, 2009 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.ant.internal.ui.editor.text;

 import java.util.Iterator;
 import java.util.StringTokenizer;

 import org.apache.tools.ant.BuildException;
 import org.apache.tools.ant.Project;
 import org.apache.tools.ant.types.AbstractFileSet;
 import org.apache.tools.ant.types.Path;
 import org.apache.tools.ant.types.PatternSet;
 import org.eclipse.ant.internal.launching.debug.model.AntProperty;
 import org.eclipse.ant.internal.launching.debug.model.AntStackFrame;
 import org.eclipse.ant.internal.launching.debug.model.AntValue;
 import org.eclipse.ant.internal.ui.editor.AntEditor;
 import org.eclipse.ant.internal.ui.editor.AntEditorSourceViewerConfiguration;
 import org.eclipse.ant.internal.ui.model.AntElementNode;
 import org.eclipse.ant.internal.ui.model.AntModel;
 import org.eclipse.ant.internal.ui.model.AntPropertyNode;
 import org.eclipse.ant.internal.ui.model.IAntModel;
 import org.eclipse.core.runtime.IAdaptable;
 import org.eclipse.debug.ui.DebugUITools;
 import org.eclipse.jface.internal.text.html.HTMLPrinter;
 import org.eclipse.jface.text.BadLocationException;
 import org.eclipse.jface.text.DefaultInformationControl;
 import org.eclipse.jface.text.IDocument;
 import org.eclipse.jface.text.IInformationControl;
 import org.eclipse.jface.text.IInformationControlCreator;
 import org.eclipse.jface.text.IRegion;
 import org.eclipse.jface.text.ITextHover;
 import org.eclipse.jface.text.ITextHoverExtension;
 import org.eclipse.jface.text.ITextViewer;
 import org.eclipse.jface.text.Position;
 import org.eclipse.jface.text.Region;
 import org.eclipse.jface.text.information.IInformationProviderExtension2;
 import org.eclipse.jface.text.source.Annotation;
 import org.eclipse.jface.text.source.IAnnotationModel;
 import org.eclipse.jface.text.source.ISourceViewer;
 import org.eclipse.swt.widgets.Shell;
 import org.eclipse.ui.editors.text.EditorsUI;


 public class XMLTextHover implements ITextHover, ITextHoverExtension, IInformationProviderExtension2 {

 	private AntEditor fEditor;

 	public XMLTextHover(AntEditor editor) {
 		super();
 		fEditor = editor;
 	}

 	/*
 	 * Formats a message as HTML text.
 	 * Expects the message to already be properly escaped
 	 */
 	private String formatMessage(String message) {
 		StringBuffer buffer= new StringBuffer();
 		HTMLPrinter.addPageProlog(buffer);
 		HTMLPrinter.addParagraph(buffer, message);
 		HTMLPrinter.addPageEpilog(buffer);
 		return buffer.toString();
 	}

 	/*
 	 * Formats a message as HTML text.
 	 */
 	private String formatPathMessage(String[] list) {
 		StringBuffer buffer= new StringBuffer();
 		HTMLPrinter.addPageProlog(buffer);
 		HTMLPrinter.addSmallHeader(buffer, AntEditorTextMessages.XMLTextHover_4);
 		HTMLPrinter.startBulletList(buffer);
 		for (int i = 0; i < list.length; i++) {
 			HTMLPrinter.addBullet(buffer, list[i]);
 		}
 		HTMLPrinter.endBulletList(buffer);
 		HTMLPrinter.addPageEpilog(buffer);
 		return buffer.toString();
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.jface.text.ITextHover#getHoverInfo(org.eclipse.jface.text.ITextViewer, org.eclipse.jface.text.IRegion)
 	 */
 	public String getHoverInfo(ITextViewer textViewer, IRegion hoverRegion) {

 		if (!(textViewer instanceof ISourceViewer)) {
 			return null;
 		}

 		ISourceViewer sourceViewer= (ISourceViewer) textViewer;
 		IAnnotationModel model= sourceViewer.getAnnotationModel();

 		if (model != null) {
 			String message= getAnnotationModelHoverMessage(model, hoverRegion);
 			if (message != null) {
 				return message;
 			}
 		}

 		AntModel antModel= fEditor.getAntModel();
 		if (antModel == null) { //the ant model has not been created yet
 			return null;
 		}

 		return getAntModelHoverMessage(antModel, hoverRegion, textViewer);

 	}

 	private String getAntModelHoverMessage(AntModel antModel, IRegion hoverRegion, ITextViewer textViewer){
 		try {
 			IDocument document= textViewer.getDocument();
 			int offset= hoverRegion.getOffset();
 			int length= hoverRegion.getLength();
 			String text= document.get(offset, length);
 			String value;
 			AntElementNode node= antModel.getNode(offset, false);
 			if (document.get(offset - 2, 2).equals("${") || node instanceof AntPropertyNode) { //$NON-NLS-1$
                 AntStackFrame frame= getFrame();
                 if (frame != null) {//active Ant debug session
                     AntProperty property= frame.findProperty(text);
                     if (property != null) {
                         return ((AntValue)property.getValue()).getValueString();
                     }
                 }
 				value= antModel.getPropertyValue(text);
 				if (value != null) {
 					return formatMessage(HTMLPrinter.convertToHTMLContent(value));
 				}
 			}
 			value= antModel.getTargetDescription(text);
 			if (value != null) {
 				return formatMessage(HTMLPrinter.convertToHTMLContent(value));
 			}
 			Object referencedObject= antModel.getReferenceObject(text);
 			if (referencedObject != null) {
 				if (referencedObject instanceof Path) {
 					return formatPathMessage(((Path)referencedObject).list());
 				} else if (referencedObject instanceof PatternSet) {
 					return formatPatternSetMessage((PatternSet) referencedObject);
 				} else if (referencedObject instanceof AbstractFileSet) {
 					return formatFileSetMessage((AbstractFileSet)referencedObject);
 				}
 			}
 		} catch (BadLocationException e) {
 		} catch (BuildException be) {
 			return be.getMessage();
 		}

 		return null;
 	}

 	private String getAnnotationModelHoverMessage(IAnnotationModel model, IRegion hoverRegion) {
 		Iterator e= model.getAnnotationIterator();
 		while (e.hasNext()) {
 			Annotation a= (Annotation) e.next();
 			if (a instanceof XMLProblemAnnotation) {
 				Position p= model.getPosition(a);
 				if (p.overlapsWith(hoverRegion.getOffset(), hoverRegion.getLength())) {
 					String msg= a.getText();
 					if (msg != null && msg.trim().length() > 0) {
 						return formatMessage(msg);
 					}
 				}
 			}
 		}
 		return null;
 	}

 	private String formatFileSetMessage(AbstractFileSet set) {
 		FileScanner fileScanner= new FileScanner();
 		IAntModel antModel= fEditor.getAntModel();
 		Project project= antModel.getProjectNode().getProject();
 		set.setupDirectoryScanner(fileScanner, project);
 		String[] excludedPatterns= fileScanner.getExcludesPatterns();
 		String[] includesPatterns= fileScanner.getIncludePatterns();
 		return formatSetMessage(includesPatterns, excludedPatterns);
 	}

 	private String formatPatternSetMessage(PatternSet set) {
 		IAntModel antModel= fEditor.getAntModel();
 		Project project= antModel.getProjectNode().getProject();
 		String[] includes= set.getIncludePatterns(project);
 		String[] excludes= set.getExcludePatterns(project);
 		return formatSetMessage(includes, excludes);
 	}

 	private String formatSetMessage(String[] includes, String[] excludes) {
 		StringBuffer buffer= new StringBuffer();
 		HTMLPrinter.addPageProlog(buffer);
 		if (includes != null && includes.length > 0) {
 			HTMLPrinter.addSmallHeader(buffer, AntEditorTextMessages.XMLTextHover_5);
 			for (int i = 0; i < includes.length; i++) {
 				HTMLPrinter.addBullet(buffer, includes[i]);
 			}
 		}
 		HTMLPrinter.addParagraph(buffer, ""); //$NON-NLS-1$
 		HTMLPrinter.addParagraph(buffer, ""); //$NON-NLS-1$
 		if (excludes != null && excludes.length > 0) {
 			HTMLPrinter.addSmallHeader(buffer, AntEditorTextMessages.XMLTextHover_6);
 			for (int i = 0; i < excludes.length; i++) {
 				HTMLPrinter.addBullet(buffer, excludes[i]);
 			}
 		}
 		HTMLPrinter.addPageEpilog(buffer);
 		return buffer.toString();
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.jface.text.ITextHover#getHoverRegion(org.eclipse.jface.text.ITextViewer, int)
 	 */
 	public IRegion getHoverRegion(ITextViewer textViewer, int offset) {
 		if (textViewer != null) {
 			return getRegion(textViewer, offset);
 		}
 		return null;
 	}

 	public static IRegion getRegion(ITextViewer textViewer, int offset) {
 		IDocument document= textViewer.getDocument();

 		int start= -1;
 		int end= -1;
 	    IRegion region= null;
 		try {
 			int pos= offset;
 			char c;

             if (document.getChar(pos) == '"') {
                 pos--;
             }
 			while (pos >= 0) {
 				c= document.getChar(pos);
 				if (c != '.' && c != '-' && c != '/' &&  c != '\\' && c != ' ' && c != ')' && c != '('&& c != ':' && !Character.isJavaIdentifierPart(c) && pos != offset)
 					break;
 				--pos;
 			}

 			start= pos;

 			pos= offset;
 			int length= document.getLength();

 			while (pos < length) {
 				c= document.getChar(pos);
 				if (c != '.' && c != '-' && c != '/' &&  c != '\\' && c != ' ' && c != ')' && c != '('&& c != ':' && !Character.isJavaIdentifierPart(c))
 					break;
                 if (c == '/' && (document.getLength() - 1) > (pos + 1) && document.getChar(pos + 1) == '>') {
                    //e.g. <name/>
                     break;
                 }
 				++pos;
 			}

 			end= pos;

 		} catch (BadLocationException x) {
 		}

 		if (start > -1 && end > -1) {
 			if (start == offset && end == offset) {
 				return new Region(offset, 0);
 			} else if (start == offset) {
 				return new Region(start, end - start);
 			} else {
                 try { //correct for spaces at beginning or end
                     while(document.getChar(start + 1) == ' ') {
                         start++;
                     }
                     while(document.getChar(end - 1) == ' ') {
                         end--;
                     }
                 } catch (BadLocationException e) {
                 }
                 region= new Region(start + 1, end - start - 1);
             }
         }

         if (region != null) {
             try {
                 char c= document.getChar(region.getOffset() - 1);
 				if (c == '"') {
 					if (document.get(offset, region.getLength()).indexOf(',') != -1) {
 						region = cleanRegionForNonProperty(offset, document, region);
 					}
 				} else if (c != '{') {
                 	region = cleanRegionForNonProperty(offset, document, region);
                 }
             } catch (BadLocationException e) {
             }
         }

 		return region;
 	}

 	private static IRegion cleanRegionForNonProperty(int offset, IDocument document, IRegion region) throws BadLocationException {
 		//do not allow spaces in region that is not a property
 		String text= document.get(region.getOffset(), region.getLength());
 		if (text.startsWith("/")) { //$NON-NLS-1$
 			text= text.substring(1);
 			region= new Region(region.getOffset() + 1, region.getLength() - 1);
 		}
 		StringTokenizer tokenizer= new StringTokenizer(text, " "); //$NON-NLS-1$
 		if (tokenizer.countTokens() != 1) {
 		    while(tokenizer.hasMoreTokens()) {
 		        String token= tokenizer.nextToken();
 		        int index= text.indexOf(token);
 		        if (region.getOffset() + index <= offset && region.getOffset() + index + token.length() >= offset) {
 		            region= new Region(region.getOffset() + index, token.length());
 		            break;
 		        }
 		    }
 		}

 		return region;
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.jface.text.ITextHoverExtension#getHoverControlCreator()
 	 */
 	public IInformationControlCreator getHoverControlCreator() {
 		return new IInformationControlCreator() {
 			public IInformationControl createInformationControl(Shell parent) {
 				return new DefaultInformationControl(parent, EditorsUI.getTooltipAffordanceString());
 			}
 		};
 	}

     /**
      * Returns the stack frame in which to search for properties, or <code>null</code>
      * if none.
      *
      * @return the stack frame in which to search for properties, or <code>null</code>
      * if none
      */
     private AntStackFrame getFrame() {
         IAdaptable adaptable = DebugUITools.getDebugContext();
         if (adaptable != null) {
             return (AntStackFrame)adaptable.getAdapter(AntStackFrame.class);
         }
         return null;
     }

 	/*
 	 * @see org.eclipse.jface.text.information.IInformationProviderExtension2#getInformationPresenterControlCreator()
 	 * @since 3.3
 	 */
 	public IInformationControlCreator getInformationPresenterControlCreator() {
 		return AntEditorSourceViewerConfiguration.getInformationPresenterControlCreator();
 	}
 }
	/*******************************************************************************
	* Copyright (c) 2000, 2009 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.ant.internal.ui.editor.text;

	import java.util.Iterator;
	import java.util.StringTokenizer;

	import org.apache.tools.ant.BuildException;
	import org.apache.tools.ant.Project;
	import org.apache.tools.ant.types.AbstractFileSet;
	import org.apache.tools.ant.types.Path;
	import org.apache.tools.ant.types.PatternSet;
	import org.eclipse.ant.internal.launching.debug.model.AntProperty;
	import org.eclipse.ant.internal.launching.debug.model.AntStackFrame;
	import org.eclipse.ant.internal.launching.debug.model.AntValue;
	import org.eclipse.ant.internal.ui.editor.AntEditor;
	import org.eclipse.ant.internal.ui.editor.AntEditorSourceViewerConfiguration;
	import org.eclipse.ant.internal.ui.model.AntElementNode;
	import org.eclipse.ant.internal.ui.model.AntModel;
	import org.eclipse.ant.internal.ui.model.AntPropertyNode;
	import org.eclipse.ant.internal.ui.model.IAntModel;
	import org.eclipse.core.runtime.IAdaptable;
	import org.eclipse.debug.ui.DebugUITools;
	import org.eclipse.jface.internal.text.html.HTMLPrinter;
	import org.eclipse.jface.text.BadLocationException;
	import org.eclipse.jface.text.DefaultInformationControl;
	import org.eclipse.jface.text.IDocument;
	import org.eclipse.jface.text.IInformationControl;
	import org.eclipse.jface.text.IInformationControlCreator;
	import org.eclipse.jface.text.IRegion;
	import org.eclipse.jface.text.ITextHover;
	import org.eclipse.jface.text.ITextHoverExtension;
	import org.eclipse.jface.text.ITextViewer;
	import org.eclipse.jface.text.Position;
	import org.eclipse.jface.text.Region;
	import org.eclipse.jface.text.information.IInformationProviderExtension2;
	import org.eclipse.jface.text.source.Annotation;
	import org.eclipse.jface.text.source.IAnnotationModel;
	import org.eclipse.jface.text.source.ISourceViewer;
	import org.eclipse.swt.widgets.Shell;
	import org.eclipse.ui.editors.text.EditorsUI;


	public class XMLTextHover implements ITextHover, ITextHoverExtension, IInformationProviderExtension2 {

	private AntEditor fEditor;

	public XMLTextHover(AntEditor editor) {
	super();
	fEditor = editor;
	}

	/*
	* Formats a message as HTML text.
	* Expects the message to already be properly escaped
	*/
	private String formatMessage(String message) {
	StringBuffer buffer= new StringBuffer();
	HTMLPrinter.addPageProlog(buffer);
	HTMLPrinter.addParagraph(buffer, message);
	HTMLPrinter.addPageEpilog(buffer);
	return buffer.toString();
	}

	/*
	* Formats a message as HTML text.
	*/
	private String formatPathMessage(String[] list) {
	StringBuffer buffer= new StringBuffer();
	HTMLPrinter.addPageProlog(buffer);
	HTMLPrinter.addSmallHeader(buffer, AntEditorTextMessages.XMLTextHover_4);
	HTMLPrinter.startBulletList(buffer);
	for (int i = 0; i < list.length; i++) {
	HTMLPrinter.addBullet(buffer, list[i]);
	}
	HTMLPrinter.endBulletList(buffer);
	HTMLPrinter.addPageEpilog(buffer);
	return buffer.toString();
	}

	/* (non-Javadoc)
	* @see org.eclipse.jface.text.ITextHover#getHoverInfo(org.eclipse.jface.text.ITextViewer, org.eclipse.jface.text.IRegion)
	*/
	public String getHoverInfo(ITextViewer textViewer, IRegion hoverRegion) {

	if (!(textViewer instanceof ISourceViewer)) {
	return null;
	}

	ISourceViewer sourceViewer= (ISourceViewer) textViewer;
	IAnnotationModel model= sourceViewer.getAnnotationModel();

	if (model != null) {
	String message= getAnnotationModelHoverMessage(model, hoverRegion);
	if (message != null) {
	return message;
	}
	}

	AntModel antModel= fEditor.getAntModel();
	if (antModel == null) { //the ant model has not been created yet
	return null;
	}

	return getAntModelHoverMessage(antModel, hoverRegion, textViewer);

	}

	private String getAntModelHoverMessage(AntModel antModel, IRegion hoverRegion, ITextViewer textViewer){
	try {
	IDocument document= textViewer.getDocument();
	int offset= hoverRegion.getOffset();
	int length= hoverRegion.getLength();
	String text= document.get(offset, length);
	String value;
	AntElementNode node= antModel.getNode(offset, false);
	if (document.get(offset - 2, 2).equals("${") \|\| node instanceof AntPropertyNode) { //$NON-NLS-1$
	AntStackFrame frame= getFrame();
	if (frame != null) {//active Ant debug session
	AntProperty property= frame.findProperty(text);
	if (property != null) {
	return ((AntValue)property.getValue()).getValueString();
	}
	}
	value= antModel.getPropertyValue(text);
	if (value != null) {
	return formatMessage(HTMLPrinter.convertToHTMLContent(value));
	}
	}
	value= antModel.getTargetDescription(text);
	if (value != null) {
	return formatMessage(HTMLPrinter.convertToHTMLContent(value));
	}
	Object referencedObject= antModel.getReferenceObject(text);
	if (referencedObject != null) {
	if (referencedObject instanceof Path) {
	return formatPathMessage(((Path)referencedObject).list());
	} else if (referencedObject instanceof PatternSet) {
	return formatPatternSetMessage((PatternSet) referencedObject);
	} else if (referencedObject instanceof AbstractFileSet) {
	return formatFileSetMessage((AbstractFileSet)referencedObject);
	}
	}
	} catch (BadLocationException e) {
	} catch (BuildException be) {
	return be.getMessage();
	}

	return null;
	}

	private String getAnnotationModelHoverMessage(IAnnotationModel model, IRegion hoverRegion) {
	Iterator e= model.getAnnotationIterator();
	while (e.hasNext()) {
	Annotation a= (Annotation) e.next();
	if (a instanceof XMLProblemAnnotation) {
	Position p= model.getPosition(a);
	if (p.overlapsWith(hoverRegion.getOffset(), hoverRegion.getLength())) {
	String msg= a.getText();
	if (msg != null && msg.trim().length() > 0) {
	return formatMessage(msg);
	}
	}
	}
	}
	return null;
	}

	private String formatFileSetMessage(AbstractFileSet set) {
	FileScanner fileScanner= new FileScanner();
	IAntModel antModel= fEditor.getAntModel();
	Project project= antModel.getProjectNode().getProject();
	set.setupDirectoryScanner(fileScanner, project);
	String[] excludedPatterns= fileScanner.getExcludesPatterns();
	String[] includesPatterns= fileScanner.getIncludePatterns();
	return formatSetMessage(includesPatterns, excludedPatterns);
	}

	private String formatPatternSetMessage(PatternSet set) {
	IAntModel antModel= fEditor.getAntModel();
	Project project= antModel.getProjectNode().getProject();
	String[] includes= set.getIncludePatterns(project);
	String[] excludes= set.getExcludePatterns(project);
	return formatSetMessage(includes, excludes);
	}

	private String formatSetMessage(String[] includes, String[] excludes) {
	StringBuffer buffer= new StringBuffer();
	HTMLPrinter.addPageProlog(buffer);
	if (includes != null && includes.length > 0) {
	HTMLPrinter.addSmallHeader(buffer, AntEditorTextMessages.XMLTextHover_5);
	for (int i = 0; i < includes.length; i++) {
	HTMLPrinter.addBullet(buffer, includes[i]);
	}
	}
	HTMLPrinter.addParagraph(buffer, ""); //$NON-NLS-1$
	HTMLPrinter.addParagraph(buffer, ""); //$NON-NLS-1$
	if (excludes != null && excludes.length > 0) {
	HTMLPrinter.addSmallHeader(buffer, AntEditorTextMessages.XMLTextHover_6);
	for (int i = 0; i < excludes.length; i++) {
	HTMLPrinter.addBullet(buffer, excludes[i]);
	}
	}
	HTMLPrinter.addPageEpilog(buffer);
	return buffer.toString();
	}

	/* (non-Javadoc)
	* @see org.eclipse.jface.text.ITextHover#getHoverRegion(org.eclipse.jface.text.ITextViewer, int)
	*/
	public IRegion getHoverRegion(ITextViewer textViewer, int offset) {
	if (textViewer != null) {
	return getRegion(textViewer, offset);
	}
	return null;
	}

	public static IRegion getRegion(ITextViewer textViewer, int offset) {
	IDocument document= textViewer.getDocument();

	int start= -1;
	int end= -1;
	IRegion region= null;
	try {
	int pos= offset;
	char c;

	if (document.getChar(pos) == '"') {
	pos--;
	}
	while (pos >= 0) {
	c= document.getChar(pos);
	if (c != '.' && c != '-' && c != '/' && c != '\\' && c != ' ' && c != ')' && c != '('&& c != ':' && !Character.isJavaIdentifierPart(c) && pos != offset)
	break;
	--pos;
	}

	start= pos;

	pos= offset;
	int length= document.getLength();

	while (pos < length) {
	c= document.getChar(pos);
	if (c != '.' && c != '-' && c != '/' && c != '\\' && c != ' ' && c != ')' && c != '('&& c != ':' && !Character.isJavaIdentifierPart(c))
	break;
	if (c == '/' && (document.getLength() - 1) > (pos + 1) && document.getChar(pos + 1) == '>') {
	//e.g. <name/>
	break;
	}
	++pos;
	}

	end= pos;

	} catch (BadLocationException x) {
	}

	if (start > -1 && end > -1) {
	if (start == offset && end == offset) {
	return new Region(offset, 0);
	} else if (start == offset) {
	return new Region(start, end - start);
	} else {
	try { //correct for spaces at beginning or end
	while(document.getChar(start + 1) == ' ') {
	start++;
	}
	while(document.getChar(end - 1) == ' ') {
	end--;
	}
	} catch (BadLocationException e) {
	}
	region= new Region(start + 1, end - start - 1);
	}
	}

	if (region != null) {
	try {
	char c= document.getChar(region.getOffset() - 1);
	if (c == '"') {
	if (document.get(offset, region.getLength()).indexOf(',') != -1) {
	region = cleanRegionForNonProperty(offset, document, region);
	}
	} else if (c != '{') {
	region = cleanRegionForNonProperty(offset, document, region);
	}
	} catch (BadLocationException e) {
	}
	}

	return region;
	}

	private static IRegion cleanRegionForNonProperty(int offset, IDocument document, IRegion region) throws BadLocationException {
	//do not allow spaces in region that is not a property
	String text= document.get(region.getOffset(), region.getLength());
	if (text.startsWith("/")) { //$NON-NLS-1$
	text= text.substring(1);
	region= new Region(region.getOffset() + 1, region.getLength() - 1);
	}
	StringTokenizer tokenizer= new StringTokenizer(text, " "); //$NON-NLS-1$
	if (tokenizer.countTokens() != 1) {
	while(tokenizer.hasMoreTokens()) {
	String token= tokenizer.nextToken();
	int index= text.indexOf(token);
	if (region.getOffset() + index <= offset && region.getOffset() + index + token.length() >= offset) {
	region= new Region(region.getOffset() + index, token.length());
	break;
	}
	}
	}

	return region;
	}

	/* (non-Javadoc)
	* @see org.eclipse.jface.text.ITextHoverExtension#getHoverControlCreator()
	*/
	public IInformationControlCreator getHoverControlCreator() {
	return new IInformationControlCreator() {
	public IInformationControl createInformationControl(Shell parent) {
	return new DefaultInformationControl(parent, EditorsUI.getTooltipAffordanceString());
	}
	};
	}

	/**
	* Returns the stack frame in which to search for properties, or <code>null</code>
	* if none.
	*
	* @return the stack frame in which to search for properties, or <code>null</code>
	* if none
	*/
	private AntStackFrame getFrame() {
	IAdaptable adaptable = DebugUITools.getDebugContext();
	if (adaptable != null) {
	return (AntStackFrame)adaptable.getAdapter(AntStackFrame.class);
	}
	return null;
	}

	/*
	* @see org.eclipse.jface.text.information.IInformationProviderExtension2#getInformationPresenterControlCreator()
	* @since 3.3
	*/
	public IInformationControlCreator getInformationPresenterControlCreator() {
	return AntEditorSourceViewerConfiguration.getInformationPresenterControlCreator();
	}
	}