/*******************************************************************************
* Copyright (c) 2000, 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.selectionaction;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.eclipse.core.runtime.Assert;
import org.eclipse.dltk.core.IMember;
import org.eclipse.dltk.core.ISourceRange;
import org.eclipse.dltk.core.IType;
import org.eclipse.dltk.core.ModelException;
import org.eclipse.dltk.core.SourceRange;
import org.eclipse.dltk.internal.ui.editor.ScriptEditor;
import org.eclipse.dltk.ui.DLTKUIPlugin;
import org.eclipse.jface.action.Action;
import org.eclipse.jface.text.ITextSelection;
import org.eclipse.ui.IEditorInput;
import org.eclipse.ui.texteditor.IUpdate;
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 ScriptEditor fEditor;
private boolean fIsGotoNext;
public static GoToNextPreviousMemberAction newGoToNextMemberAction(
ScriptEditor editor) {
String text = SelectionActionMessages.GotoNextMember_label;
return new GoToNextPreviousMemberAction(editor, text, true);
}
public static GoToNextPreviousMemberAction newGoToPreviousMemberAction(
ScriptEditor editor) {
String text = SelectionActionMessages.GotoPreviousMember_label;
return new GoToNextPreviousMemberAction(editor, text, false);
}
private GoToNextPreviousMemberAction(ScriptEditor editor, String text,
boolean isGotoNext) {
super(text);
fEditor = editor;
fIsGotoNext = isGotoNext;
// 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;
}
@Override
public void update() {
// Enable by default always.
setEnabled(true);
}
@Override
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 ModelException {
IEditorInput input = fEditor.getEditorInput();
return DLTKUIPlugin.getDefault().getWorkingCopyManager()
.getWorkingCopy(input).getTypes();
}
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 (ModelException e) {
DLTKUIPlugin.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 ModelException {
List<Integer> 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.getMethods());
addMemberOffsetList(result, iType.getFields());
// addMemberOffsetList(result, iType.getInitializers());
}
return result.toArray(new Integer[result.size()]);
}
private static void addMemberOffsetList(List result, IMember[] members)
throws ModelException {
for (int i = 0; i < members.length; i++) {
addOffset(result, getOffset(members[i]));
}
}
private static int getOffset(IMember iMember) throws ModelException {
// special case
// if (iMember.getElementType() == IModelElement.INITIALIZER)
// return firstOpeningBraceOffset((IInitializer)iMember);
if (iMember.getNameRange() != null
&& iMember.getNameRange().getOffset() >= 0)
return iMember.getNameRange().getOffset();
return iMember.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));
}
}