/*******************************************************************************
* 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.selectionactions;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.eclipse.core.runtime.Assert;
import org.eclipse.jface.action.Action;
import org.eclipse.jface.text.ITextSelection;
import org.eclipse.ui.IEditorInput;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.texteditor.IUpdate;
import org.eclipse.wst.jsdt.core.IInitializer;
import org.eclipse.wst.jsdt.core.IJavaScriptElement;
import org.eclipse.wst.jsdt.core.IMember;
import org.eclipse.wst.jsdt.core.ISourceRange;
import org.eclipse.wst.jsdt.core.ISourceReference;
import org.eclipse.wst.jsdt.core.IType;
import org.eclipse.wst.jsdt.core.JavaScriptModelException;
import org.eclipse.wst.jsdt.core.ToolFactory;
import org.eclipse.wst.jsdt.core.compiler.IScanner;
import org.eclipse.wst.jsdt.core.compiler.ITerminalSymbols;
import org.eclipse.wst.jsdt.core.compiler.InvalidInputException;
import org.eclipse.wst.jsdt.internal.corext.SourceRange;
import org.eclipse.wst.jsdt.internal.ui.IJavaHelpContextIds;
import org.eclipse.wst.jsdt.internal.ui.JavaScriptPlugin;
import org.eclipse.wst.jsdt.internal.ui.javaeditor.IClassFileEditorInput;
import org.eclipse.wst.jsdt.internal.ui.javaeditor.JavaEditor;
public class GoToNextPreviousMemberAction extends Action implements IUpdate {
public static final String NEXT_MEMBER= "GoToNextMember"; //$NON-NLS-1$
public static final String PREVIOUS_MEMBER= "GoToPreviousMember"; //$NON-NLS-1$
private JavaEditor fEditor;
private boolean fIsGotoNext;
public static GoToNextPreviousMemberAction newGoToNextMemberAction(JavaEditor editor) {
String text= SelectionActionMessages.GotoNextMember_label;
return new GoToNextPreviousMemberAction(editor, text, true);
}
public static GoToNextPreviousMemberAction newGoToPreviousMemberAction(JavaEditor editor) {
String text= SelectionActionMessages.GotoPreviousMember_label;
return new GoToNextPreviousMemberAction(editor, text, false);
}
private GoToNextPreviousMemberAction(JavaEditor editor, String text, boolean isGotoNext) {
super(text);
Assert.isNotNull(editor);
fEditor= editor;
fIsGotoNext= isGotoNext;
update();
if (isGotoNext)
PlatformUI.getWorkbench().getHelpSystem().setHelp(this, IJavaHelpContextIds.GOTO_NEXT_MEMBER_ACTION);
else
PlatformUI.getWorkbench().getHelpSystem().setHelp(this, IJavaHelpContextIds.GOTO_PREVIOUS_MEMBER_ACTION);
}
/*
* This constructor is for testing purpose only.
*/
public GoToNextPreviousMemberAction(boolean isSelectNext) {
super(""); //$NON-NLS-1$
fIsGotoNext= isSelectNext;
}
public void update() {
boolean enabled= false;
ISourceReference ref= getSourceReference();
if (ref != null) {
ISourceRange range;
try {
range= ref.getSourceRange();
enabled= range != null && range.getLength() > 0;
} catch (JavaScriptModelException e) {
// enabled= false;
}
}
setEnabled(enabled);
}
/* (non-JavaDoc)
* Method declared in IAction.
*/
public final void run() {
ITextSelection selection= getTextSelection();
ISourceRange newRange= getNewSelectionRange(createSourceRange(selection), null);
// Check if new selection differs from current selection
if (selection.getOffset() == newRange.getOffset() && selection.getLength() == newRange.getLength())
return;
fEditor.selectAndReveal(newRange.getOffset(), newRange.getLength());
}
private IType[] getTypes() throws JavaScriptModelException {
IEditorInput input= fEditor.getEditorInput();
if (input instanceof IClassFileEditorInput) {
return new IType[] { ((IClassFileEditorInput)input).getClassFile().getType() };
} else {
return JavaScriptPlugin.getDefault().getWorkingCopyManager().getWorkingCopy(input).getAllTypes();
}
}
private ISourceReference getSourceReference() {
IEditorInput input= fEditor.getEditorInput();
if (input instanceof IClassFileEditorInput) {
return ((IClassFileEditorInput)input).getClassFile();
} else {
return JavaScriptPlugin.getDefault().getWorkingCopyManager().getWorkingCopy(input);
}
}
private ITextSelection getTextSelection() {
return (ITextSelection)fEditor.getSelectionProvider().getSelection();
}
public ISourceRange getNewSelectionRange(ISourceRange oldSourceRange, IType[] types) {
try{
if (types == null)
types= getTypes();
Integer[] offsetArray= createOffsetArray(types);
if (offsetArray.length == 0)
return oldSourceRange;
Arrays.sort(offsetArray);
Integer oldOffset= Integer.valueOf(oldSourceRange.getOffset());
int index= Arrays.binarySearch(offsetArray, oldOffset);
if (fIsGotoNext)
return createNewSourceRange(getNextOffset(index, offsetArray, oldOffset));
else
return createNewSourceRange(getPreviousOffset(index, offsetArray, oldOffset));
} catch (JavaScriptModelException e){
JavaScriptPlugin.log(e); //dialog would be too heavy here
return oldSourceRange;
}
}
private static Integer getPreviousOffset(int index, Integer[] offsetArray, Integer oldOffset) {
if (index == -1)
return oldOffset;
if (index == 0)
return offsetArray[0];
if (index > 0)
return offsetArray[index - 1];
Assert.isTrue(index < -1);
int absIndex= Math.abs(index);
return offsetArray[absIndex - 2];
}
private static Integer getNextOffset(int index, Integer[] offsetArray, Integer oldOffset) {
if (index == -1)
return offsetArray[0];
if (index == 0){
if (offsetArray.length != 1)
return offsetArray[1];
else
return offsetArray[0];
}
if (index > 0){
if (index == offsetArray.length - 1)
return oldOffset;
return offsetArray[index + 1];
}
Assert.isTrue(index < -1);
int absIndex= Math.abs(index);
if (absIndex > offsetArray.length)
return oldOffset;
else
return offsetArray[absIndex - 1];
}
private static ISourceRange createNewSourceRange(Integer offset){
return new SourceRange(offset.intValue(), 0);
}
private static Integer[] createOffsetArray(IType[] types) throws JavaScriptModelException {
List result= new ArrayList();
for (int i= 0; i < types.length; i++) {
IType iType= types[i];
addOffset(result, iType.getNameRange().getOffset());
addOffset(result, iType.getSourceRange().getOffset() + iType.getSourceRange().getLength());
addMemberOffsetList(result, iType.getFunctions());
addMemberOffsetList(result, iType.getFields());
addMemberOffsetList(result, iType.getInitializers());
}
return (Integer[]) result.toArray(new Integer[result.size()]);
}
private static void addMemberOffsetList(List result, IMember[] members) throws JavaScriptModelException {
for (int i= 0; i < members.length; i++) {
addOffset(result, getOffset(members[i]));
}
}
private static int getOffset(IMember iMember) throws JavaScriptModelException {
//special case
if (iMember.getElementType() == IJavaScriptElement.INITIALIZER)
return firstOpeningBraceOffset((IInitializer)iMember);
if (iMember.getNameRange() != null && iMember.getNameRange().getOffset() >= 0)
return iMember.getNameRange().getOffset();
return iMember.getSourceRange().getOffset();
}
private static int firstOpeningBraceOffset(IInitializer iInitializer) throws JavaScriptModelException {
try {
IScanner scanner= ToolFactory.createScanner(false, false, false, false);
scanner.setSource(iInitializer.getSource().toCharArray());
int token= scanner.getNextToken();
while (token != ITerminalSymbols.TokenNameEOF && token != ITerminalSymbols.TokenNameLBRACE)
token= scanner.getNextToken();
if (token == ITerminalSymbols.TokenNameLBRACE)
return iInitializer.getSourceRange().getOffset() + scanner.getCurrentTokenStartPosition() + scanner.getRawTokenSource().length;
return iInitializer.getSourceRange().getOffset();
} catch (InvalidInputException e) {
return iInitializer.getSourceRange().getOffset();
}
}
//-- private helper methods
private static ISourceRange createSourceRange(ITextSelection ts) {
return new SourceRange(ts.getOffset(), ts.getLength());
}
private static void addOffset(List result, int offset) {
if (offset >= 0)
result.add(Integer.valueOf(offset));
}
}