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// Copyright (c) 2003-present, Jodd Team (http://jodd.org)
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
package jodd.lagarto.dom;
import jodd.util.StringUtil;
import java.util.ArrayList;
/**
* Simplified HTML foster rules for tables.
*/
public class HtmlFosterRules {
public static final String[] FOSTER_TABLE_ELEMENTS = new String[] {
"table", "tbody", "tfoot", "thead", "tr"
};
public static final String[] TABLE_ELEMENTS = new String[] {
"table", "tbody", "tfoot", "thead", "th" ,"tr", "td", "caption", "colgroup", "col"
};
/**
* Returns true if provided element is one of the table-related elements.
*/
protected boolean isOneOfTableElements(final Element element) {
String elementName = element.getNodeName().toLowerCase();
return StringUtil.equalsOne(elementName, TABLE_ELEMENTS) != -1;
}
/**
* Returns true if given node is a table element.
*/
protected boolean isTableElement(final Node node) {
if (node.getNodeType() != Node.NodeType.ELEMENT) {
return false;
}
String elementName = node.getNodeName().toLowerCase();
return elementName.equals("table");
}
/**
* Returns true if parent node is one of the table elements.
*/
protected boolean isParentNodeOneOfFosterTableElements(final Node parentNode) {
if (parentNode == null) {
return false;
}
if (parentNode.getNodeName() == null) {
return false;
}
String nodeName = parentNode.getNodeName().toLowerCase();
return StringUtil.equalsOne(nodeName, FOSTER_TABLE_ELEMENTS) != -1;
}
/**
* Finds the last table in stack of open elements.
*/
protected Element findLastTable(final Node node) {
Node tableNode = node;
while (tableNode != null) {
if (tableNode.getNodeType() == Node.NodeType.ELEMENT) {
String tableNodeName = tableNode.getNodeName().toLowerCase();
if (tableNodeName.equals("table")) {
break;
}
}
tableNode = tableNode.getParentNode();
}
return (Element) tableNode;
}
// ---------------------------------------------------------------- core
protected ArrayList lastTables = new ArrayList<>();
protected ArrayList fosterElements = new ArrayList<>();
protected ArrayList fosterTexts = new ArrayList<>();
/**
* Fixes foster elements.
*/
public void fixFosterElements(final Document document) {
findFosterNodes(document);
fixElements();
fixText();
}
/**
* Finds foster elements. Returns true if there was no change in
* DOM tree of the parent element. Otherwise, returns false
* meaning that parent will scan its childs again.
*/
protected boolean findFosterNodes(final Node node) {
boolean isTable = false;
if (!lastTables.isEmpty()) {
// if inside table
if (node.getNodeType() == Node.NodeType.TEXT) {
String value = node.getNodeValue();
if (!StringUtil.isBlank(value)) {
if (isParentNodeOneOfFosterTableElements(node.getParentNode())) {
fosterTexts.add((Text) node);
}
}
}
}
if (node.getNodeType() == Node.NodeType.ELEMENT) {
Element element = (Element) node;
isTable = isTableElement(node);
if (isTable) {
// if node is a table, add it to the stack-of-last-tables
lastTables.add(element);
} else {
// otherwise...
// ...if inside the table
if (!lastTables.isEmpty()) {
// check this and parent
Node parentNode = node.getParentNode();
if (
isParentNodeOneOfFosterTableElements(parentNode) &&
!isOneOfTableElements(element)
) {
String elementNodeName = element.getNodeName().toLowerCase();
if (elementNodeName.equals("form")) {
if (element.getChildNodesCount() > 0) {
// if form element, take all its child nodes
// and add after the from element
Node[] formChildNodes = element.getChildNodes();
parentNode.insertAfter(formChildNodes, element);
return false;
} else {
// empty form element, leave it where it is
return true;
}
}
if (elementNodeName.equals("input")) {
String inputType = element.getAttribute("type");
if (inputType.equals("hidden")) {
// input hidden elements remains as they are
return true;
}
}
// foster element found, remember it to process it later
fosterElements.add(element);
}
} else {
// ...if not inside the table, just keep going
}
}
}
allchilds:
while (true) {
int childs = node.getChildNodesCount();
for (int i = 0; i < childs; i++) {
Node childNode = node.getChild(i);
boolean done = findFosterNodes(childNode);
if (!done) {
continue allchilds;
}
}
break;
}
if (isTable) {
// remove last element
int size = lastTables.size();
if (size > 0) {
lastTables.remove(size - 1); // no array copy occurs when the last element is removed
}
}
return true;
}
/**
* Performs the fix for elements.
*/
protected void fixElements() {
for (Element fosterElement : fosterElements) {
// find parent table
Element lastTable = findLastTable(fosterElement);
Node fosterElementParent = fosterElement.getParentNode();
// filter our foster element
Node[] fosterChilds = fosterElement.getChildNodes();
for (Node fosterChild : fosterChilds) {
if (fosterChild.getNodeType() == Node.NodeType.ELEMENT) {
if (isOneOfTableElements((Element) fosterChild)) {
// move all child table elements outside
// the foster element
fosterChild.detachFromParent();
fosterElementParent.insertBefore(fosterChild, fosterElement);
}
}
}
// finally, move foster element above the table
fosterElement.detachFromParent();
lastTable.getParentNode().insertBefore(fosterElement, lastTable);
}
}
protected void fixText() {
for (Text fosterText : fosterTexts) {
// find parent table
Element lastTable = findLastTable(fosterText);
// move foster element above the table
fosterText.detachFromParent();
Node tablesPreviousNode = lastTable.getPreviousSibling();
if (tablesPreviousNode.getNodeType() == Node.NodeType.TEXT) {
// append to previous text node
Text textNode = (Text) tablesPreviousNode;
String text = textNode.getNodeValue();
textNode.setNodeValue(text + fosterText.getNodeValue());
} else {
// insert text node before the table
lastTable.getParentNode().insertBefore(fosterText, lastTable);
}
}
}
}