/*******************************************************************************
* Copyright (c) 2000, 2007 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.corext.dom.fragments;
import org.eclipse.core.runtime.Assert;
import org.eclipse.wst.jsdt.core.IBuffer;
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;
/**
* This class houses a collection of static methods which do not refer to,
* or otherwise depend on, other classes in this package. Each
* package-visible method is called by more than one other class in this
* package. Since they do not depend on other classes in this package,
* they could be moved to some less specialized package.
*/
class Util {
static boolean rangeIncludesNonWhitespaceOutsideRange(SourceRange selection, SourceRange nodes, IBuffer buffer) {
if(!selection.covers(nodes))
return false;
//TODO: skip leading comments. Consider that leading line comment must be followed by newline!
if(!isJustWhitespace(selection.getOffset(), nodes.getOffset(), buffer))
return true;
if(!isJustWhitespaceOrComment(nodes.getOffset() + nodes.getLength(), selection.getOffset() + selection.getLength(), buffer))
return true;
return false;
}
private static boolean isJustWhitespace(int start, int end, IBuffer buffer) {
if (start == end)
return true;
Assert.isTrue(start <= end);
return 0 == buffer.getText(start, end - start).trim().length();
}
private static boolean isJustWhitespaceOrComment(int start, int end, IBuffer buffer) {
if (start == end)
return true;
Assert.isTrue(start <= end);
String trimmedText= buffer.getText(start, end - start).trim();
if (0 == trimmedText.length()) {
return true;
} else {
IScanner scanner= ToolFactory.createScanner(false, false, false, null);
scanner.setSource(trimmedText.toCharArray());
try {
return scanner.getNextToken() == ITerminalSymbols.TokenNameEOF;
} catch (InvalidInputException e) {
return false;
}
}
}
}