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/*******************************************************************************
* Copyright (c) 2011, 2013 Tasktop Technologies.
* 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:
* David Green - initial API and implementation
*******************************************************************************/
package org.eclipse.mylyn.internal.wikitext.core.parser.html;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.nodes.Node;
import org.jsoup.nodes.TextNode;
/**
* @author David Green
*/
class WhitespaceCleanupProcessor extends DocumentProcessor {
@Override
public void process(Document document) {
Element body = document.body();
Set<Node> affectedParents = new HashSet<Node>();
// for every element containing text with leading or trailing whitespace, move the whitespace out of the element.
for (Element element : body.getAllElements()) {
if (!Html.isWhitespacePreserve(element)) {
normalizeTextNodes(element);
List<Node> children = element.childNodes();
if (!children.isEmpty()) {
Node firstChild = children.get(0);
if (firstChild instanceof TextNode) {
TextNode textNode = (TextNode) firstChild;
String text = textNode.getWholeText();
int nonWhitespaceIndex = firstIndexOfNonWhitespace(text);
if (nonWhitespaceIndex > 0) {
affectedParents.add(textNode.parent());
// split
textNode.splitText(nonWhitespaceIndex);
// move outside
textNode.remove();
computeBeforeTarget(element).before(textNode);
affectedParents.add(textNode.parent());
} else if (nonWhitespaceIndex == -1) {
// move outside
textNode.remove();
computeAfterTarget(element).after(textNode);
affectedParents.add(textNode.parent());
}
}
children = element.childNodes();
if (!children.isEmpty()) {
Node lastChild = children.get(children.size() - 1);
if (lastChild instanceof TextNode) {
TextNode textNode = (TextNode) lastChild;
String text = textNode.getWholeText();
int lastNonWhitespaceIndex = lastIndexOfNonWhitespace(text);
if (lastNonWhitespaceIndex < 0) {
// move outside
textNode.remove();
computeAfterTarget(element).after(textNode);
affectedParents.add(textNode.parent());
} else if (lastNonWhitespaceIndex < (text.length() - 1)) {
affectedParents.add(textNode.parent());
// split
textNode.splitText(lastNonWhitespaceIndex + 1);
// move outside
textNode = (TextNode) textNode.nextSibling();
textNode.remove();
computeAfterTarget(element).after(textNode);
affectedParents.add(textNode.parent());
}
}
}
}
if (!affectedParents.isEmpty()) {
for (Node parent : affectedParents) {
if (parent instanceof Element) {
normalizeTextNodes((Element) parent);
}
}
affectedParents.clear();
}
}
}
}
private Element computeAfterTarget(Element element) {
if (element.parent() != null && !element.nodeName().equalsIgnoreCase("html")) { //$NON-NLS-1$
List<Node> elementParentChildNodes = element.parent().childNodes();
if (elementParentChildNodes.size() == 1
|| elementParentChildNodes.get(elementParentChildNodes.size() - 1) == element) {
return computeAfterTarget(element.parent());
}
}
return element;
}
private Element computeBeforeTarget(Element element) {
if (element.parent() != null && !element.parent().nodeName().equalsIgnoreCase("html")) { //$NON-NLS-1$
List<Node> elementParentChildNodes = element.parent().childNodes();
if (elementParentChildNodes.size() == 1 || elementParentChildNodes.get(0) == element) {
return computeBeforeTarget(element.parent());
}
}
return element;
}
private static int lastIndexOfNonWhitespace(String text) {
int i = text.length() - 1;
while (i > -1) {
if (!Character.isWhitespace(text.charAt(i))) {
return i;
}
--i;
}
return i;
}
private static int firstIndexOfNonWhitespace(String text) {
int i = 0;
while (i < text.length()) {
if (!Character.isWhitespace(text.charAt(i))) {
return i;
}
++i;
}
return -1;
}
}
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