nu.validator.checker.table.TableChecker Maven / Gradle / Ivy
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An HTML-checking library (used by https://html5.validator.nu and the HTML5 facet of the W3C Validator)
/*
* Copyright (c) 2006 Henri Sivonen
* Copyright (c) 2017 Mozilla Foundation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
package nu.validator.checker.table;
import java.util.LinkedList;
import nu.validator.checker.AttributeUtil;
import nu.validator.checker.Checker;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
/**
* Checks XHTML table integrity: overlapping cells, spanning past the end
* of row group, etc.
*
* @version $Id$
* @author hsivonen
*/
public final class TableChecker extends Checker {
private static final int MAX_COLSPAN = 1000;
/**
* Constructor.
*/
public TableChecker() {
super();
}
/**
* Holds the current table. (Premature optimization to avoid
* peeking the top of the stack all the time.)
*/
private Table current;
/**
* A stack for holding the tables that are open and ancestors of
* the current table. Grows from the tail.
*/
private final LinkedList stack = new LinkedList<>();
/**
* Pushes the current table onto the stack and creates a new one.
*/
private void push() {
if (current != null) {
stack.addLast(current);
}
current = new Table(this);
}
/**
* Ends the current table, discards it and pops the top of the
* stack to be the new current table.
*
* @throws SAXException if ending the table throws
*/
private void pop() throws SAXException {
if (current == null) {
throw new IllegalStateException("Bug!");
}
current.end();
if (stack.isEmpty()) {
current = null;
} else {
current = stack.removeLast();
}
}
/**
* @see nu.validator.checker.Checker#startElement(java.lang.String,
* java.lang.String, java.lang.String, org.xml.sax.Attributes)
*/
@Override
public void startElement(String uri, String localName, String qName,
Attributes atts) throws SAXException {
if ("http://www.w3.org/1999/xhtml".equals(uri)) {
if ("table".equals(localName)) {
push();
} else if (current != null) {
if ("td".equals(localName)) {
current.startCell(false, atts);
} else if ("th".equals(localName)) {
current.startCell(true, atts);
} else if ("tr".equals(localName)) {
current.startRow();
} else if ("tbody".equals(localName)
|| "thead".equals(localName)
|| "tfoot".equals(localName)) {
current.startRowGroup(localName);
} else if ("col".equals(localName)) {
current.startCol(clampSpan(atts));
} else if ("colgroup".equals(localName)) {
current.startColGroup(clampSpan(atts));
}
}
}
}
public int clampSpan(Attributes atts) throws SAXException {
int span = AttributeUtil.parseNonNegativeInteger(
atts.getValue("", "span"));
if (span > MAX_COLSPAN) {
err("The value of the \u201Cspan\u201D attribute must be less than"
+ " or equal to " + MAX_COLSPAN + ".");
span = MAX_COLSPAN;
}
return span;
}
/**
* @see nu.validator.checker.Checker#endElement(java.lang.String,
* java.lang.String, java.lang.String)
*/
@Override
public void endElement(String uri, String localName, String qName)
throws SAXException {
if ("http://www.w3.org/1999/xhtml".equals(uri)) {
if ("table".equals(localName)) {
pop();
} else if (current != null) {
if ("td".equals(localName)) {
current.endCell();
} else if ("th".equals(localName)) {
current.endCell();
} else if ("tr".equals(localName)) {
current.endRow();
} else if ("tbody".equals(localName)
|| "thead".equals(localName)
|| "tfoot".equals(localName)) {
current.endRowGroup();
} else if ("col".equals(localName)) {
current.endCol();
} else if ("colgroup".equals(localName)) {
current.endColGroup();
}
}
}
}
/**
* @see nu.validator.checker.Checker#reset()
*/
@Override
public void reset() {
stack.clear();
current = null;
}
}
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