nu.validator.servlet.CssDetector 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) 2008 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.servlet;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import nu.validator.checker.AttributeUtil;
import org.xml.sax.Attributes;
import org.xml.sax.ContentHandler;
import org.xml.sax.DTDHandler;
import org.xml.sax.Locator;
import org.xml.sax.SAXException;
import com.thaiopensource.validate.Validator;
public class CssDetector implements Validator, ContentHandler {
public static boolean lowerCaseLiteralEqualsIgnoreAsciiCase(String lowerCaseLiteral,
String string) {
if (string == null) {
return false;
}
if (lowerCaseLiteral.length() != string.length()) {
return false;
}
for (int i = 0; i < lowerCaseLiteral.length(); i++) {
char c0 = lowerCaseLiteral.charAt(i);
char c1 = string.charAt(i);
if (c1 >= 'A' && c1 <= 'Z') {
c1 += 0x20;
}
if (c0 != c1) {
return false;
}
}
return true;
}
private static final Pattern TEXT_CSS = Pattern.compile("^[tT][eE][xX][tT]/[cC][sS][sS]\\s*(?:;.*)?$");
private boolean sawCss = false;
public ContentHandler getContentHandler() {
return this;
}
public DTDHandler getDTDHandler() {
return null;
}
public void reset() {
sawCss = false;
}
public void characters(char[] ch, int start, int length)
throws SAXException {
}
public void endDocument() throws SAXException {
}
public void endElement(String uri, String localName, String name)
throws SAXException {
}
public void endPrefixMapping(String prefix) throws SAXException {
// TODO Auto-generated method stub
}
public void ignorableWhitespace(char[] ch, int start, int length)
throws SAXException {
}
public void processingInstruction(String target, String data)
throws SAXException {
}
public void setDocumentLocator(Locator locator) {
}
public void skippedEntity(String name) throws SAXException {
}
public void startDocument() throws SAXException {
reset();
}
public void startElement(String uri, String localName, String name,
Attributes atts) throws SAXException {
if ("http://www.w3.org/1999/xhtml" == uri) {
if ("style" == localName) {
checkType(atts);
return;
} else if ("link" == localName) {
String rel = atts.getValue("", "rel");
if (rel != null) {
String[] tokens = AttributeUtil.split(rel);
for (int i = 0; i < tokens.length; i++) {
String token = tokens[i];
if (lowerCaseLiteralEqualsIgnoreAsciiCase("stylesheet", token)) {
checkType(atts);
return;
}
}
}
} else {
if (atts.getIndex("", "style") > -1) {
sawCss = true;
}
}
}
}
private void checkType(Attributes atts) {
String type = atts.getValue("", "type");
if (type == null) {
sawCss = true;
} else {
Matcher m = TEXT_CSS.matcher(type);
if (m.matches()) {
sawCss = true;
}
}
}
public void startPrefixMapping(String prefix, String uri)
throws SAXException {
}
}