/*
* Copyright (c) 2011 Google Inc.
*
* 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 com.google.eclipse.protobuf.ui.editor.model;
import static java.lang.Character.isWhitespace;
import static org.eclipse.jface.text.IDocumentExtension3.DEFAULT_PARTITIONING;
import static org.eclipse.jface.text.TextUtilities.getPartition;
import org.apache.log4j.Logger;
import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.IRegion;
import org.eclipse.jface.text.ITypedRegion;
import org.eclipse.text.edits.DeleteEdit;
import org.eclipse.text.edits.MultiTextEdit;
import org.eclipse.text.edits.TextEdit;
import com.google.inject.Singleton;
/**
* @author alruiz@google.com (Alex Ruiz)
*/
@Singleton class SaveActions {
private static Logger logger = Logger.getLogger(SaveActions.class);
TextEdit createSaveAction(IDocument document, IRegion[] changedRegions) {
try {
return doCreateSaveAction(document, changedRegions);
} catch (BadLocationException e) {
logger.error("Unable to create save actions", e);
}
return null;
}
private TextEdit doCreateSaveAction(IDocument document, IRegion[] changedRegions) throws BadLocationException {
TextEdit rootEdit = null;
for (IRegion region : changedRegions) {
int lastLine = document.getLineOfOffset(region.getOffset() + region.getLength());
for (int line = firstLine(region, document); line <= lastLine; line++) {
IRegion lineRegion = document.getLineInformation(line);
if (lineRegion.getLength() == 0) {
continue;
}
int lineStart = lineRegion.getOffset();
int lineEnd = lineStart + lineRegion.getLength();
int charPos = rightMostNonWhitespaceChar(document, lineStart, lineEnd);
if (charPos >= lineEnd) {
continue;
}
// check partition - don't remove whitespace inside strings
ITypedRegion partition = getPartition(document, DEFAULT_PARTITIONING, charPos, false);
if ("__string".equals(partition.getType())) {
continue;
}
if (rootEdit == null) {
rootEdit = new MultiTextEdit();
}
rootEdit.addChild(new DeleteEdit(charPos, lineEnd - charPos));
}
}
return rootEdit;
}
private int firstLine(IRegion region, IDocument document) throws BadLocationException {
return document.getLineOfOffset(region.getOffset());
}
private int rightMostNonWhitespaceChar(IDocument document, int lineStart, int lineEnd) throws BadLocationException {
int charPos = lineEnd - 1;
while (charPos >= lineStart && isWhitespace(document.getChar(charPos))) {
charPos--;
}
return ++charPos;
}
}