/*=============================================================================#
# Copyright (c) 2000-2016 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 de.walware.ecommons.ltk.core.refactoring;
import org.eclipse.core.runtime.Assert;
import org.eclipse.ltk.core.refactoring.CategorizedTextEditGroup;
import org.eclipse.ltk.core.refactoring.GroupCategorySet;
import org.eclipse.ltk.core.refactoring.TextChange;
import org.eclipse.ltk.core.refactoring.TextEditChangeGroup;
import org.eclipse.text.edits.MalformedTreeException;
import org.eclipse.text.edits.MultiTextEdit;
import org.eclipse.text.edits.TextEdit;
import org.eclipse.text.edits.TextEditGroup;
/**
* A utility class to provide compatibility with the old
* text change API of adding text edits directly and auto
* inserting them into the tree.
*/
public class TextChangeCompatibility {
public static void addTextEdit(final TextChange change, final String name, final TextEdit edit) throws MalformedTreeException {
addTextEdit(change, name, edit, true);
}
public static void addTextEdit(final TextChange change, final String name, final TextEdit edit, final boolean enable) throws MalformedTreeException {
Assert.isNotNull(change);
Assert.isNotNull(name);
Assert.isNotNull(edit);
TextEdit root= change.getEdit();
if (root == null) {
root= new MultiTextEdit();
change.setEdit(root);
}
insert(root, edit);
final TextEditChangeGroup group = new TextEditChangeGroup(change, new TextEditGroup(name, edit));
group.setEnabled(enable);
change.addTextEditChangeGroup(group);
}
public static void addTextEdit(final TextChange change, final String name, final TextEdit edit, final GroupCategorySet groupCategories) throws MalformedTreeException {
Assert.isNotNull(change);
Assert.isNotNull(name);
Assert.isNotNull(edit);
TextEdit root= change.getEdit();
if (root == null) {
root= new MultiTextEdit();
change.setEdit(root);
}
insert(root, edit);
change.addTextEditChangeGroup(new TextEditChangeGroup(
change,
new CategorizedTextEditGroup(name, edit, groupCategories)));
}
public static void insert(final TextEdit parent, final TextEdit edit) throws MalformedTreeException {
if (!parent.hasChildren()) {
parent.addChild(edit);
return;
}
final TextEdit[] children= parent.getChildren();
// First dive down to find the right parent.
for (int i= 0; i < children.length; i++) {
final TextEdit child= children[i];
if (covers(child, edit)) {
insert(child, edit);
return;
}
}
// We have the right parent. Now check if some of the children have to
// be moved under the new edit since it is covering it.
int removed= 0;
for (int i= 0; i < children.length; i++) {
final TextEdit child= children[i];
if (covers(edit, child)) {
parent.removeChild(i - removed++);
edit.addChild(child);
}
}
parent.addChild(edit);
}
private static boolean covers(final TextEdit thisEdit, final TextEdit otherEdit) {
if (thisEdit.getLength() == 0) { // an insertion point can't cover anything
return false;
}
final int thisOffset= thisEdit.getOffset();
final int thisEnd= thisEdit.getExclusiveEnd();
if (otherEdit.getLength() == 0) {
final int otherOffset= otherEdit.getOffset();
return thisOffset < otherOffset && otherOffset < thisEnd;
} else {
final int otherOffset= otherEdit.getOffset();
final int otherEnd= otherEdit.getExclusiveEnd();
return thisOffset <= otherOffset && otherEnd <= thisEnd;
}
}
}