/*
 * 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.xml.dataattributes;

import nu.validator.htmlparser.impl.NCName;
import nu.validator.xml.AttributesImpl;

import org.xml.sax.Attributes;
import org.xml.sax.ContentHandler;
import org.xml.sax.ErrorHandler;
import org.xml.sax.Locator;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;

/**
 * This wrapper removes <code>data-*</code> attributes from the pipeline and emits errors if the 
 * <code>data-*</code> attributes contain prohibited characters.
 * 
 * @version $Id$
 * @author hsivonen
 */
public class DataAttributeDroppingContentHandlerWrapper implements ContentHandler {

    private final ContentHandler delegate;
    
    private final ErrorHandler errorHandler;

    private Locator locator = null;
    
    /**
     * @param delegate
     */
    public DataAttributeDroppingContentHandlerWrapper(ContentHandler delegate, ErrorHandler errorHandler) {
        this.delegate = delegate;
        this.errorHandler = errorHandler;
    }
    
    /**
     * @param arg0
     * @param arg1
     * @param arg2
     * @throws SAXException
     * @see org.xml.sax.ContentHandler#characters(char[], int, int)
     */
    public void characters(char[] arg0, int arg1, int arg2) throws SAXException {
        delegate.characters(arg0, arg1, arg2);
    }

    /**
     * @throws SAXException
     * @see org.xml.sax.ContentHandler#endDocument()
     */
    public void endDocument() throws SAXException {
        delegate.endDocument();
    }

    /**
     * @param arg0
     * @param arg1
     * @param arg2
     * @throws SAXException
     * @see org.xml.sax.ContentHandler#endElement(java.lang.String, java.lang.String, java.lang.String)
     */
    public void endElement(String arg0, String arg1, String arg2)
            throws SAXException {
        delegate.endElement(arg0, arg1, arg2);
    }

    /**
     * @param arg0
     * @throws SAXException
     * @see org.xml.sax.ContentHandler#endPrefixMapping(java.lang.String)
     */
    public void endPrefixMapping(String arg0) throws SAXException {
        delegate.endPrefixMapping(arg0);
    }

    /**
     * @param arg0
     * @param arg1
     * @param arg2
     * @throws SAXException
     * @see org.xml.sax.ContentHandler#ignorableWhitespace(char[], int, int)
     */
    public void ignorableWhitespace(char[] arg0, int arg1, int arg2)
            throws SAXException {
        delegate.ignorableWhitespace(arg0, arg1, arg2);
    }

    /**
     * @param arg0
     * @param arg1
     * @throws SAXException
     * @see org.xml.sax.ContentHandler#processingInstruction(java.lang.String, java.lang.String)
     */
    public void processingInstruction(String arg0, String arg1)
            throws SAXException {
        delegate.processingInstruction(arg0, arg1);
    }

    /**
     * @param arg0
     * @see org.xml.sax.ContentHandler#setDocumentLocator(org.xml.sax.Locator)
     */
    public void setDocumentLocator(Locator arg0) {
        locator  = arg0;
        delegate.setDocumentLocator(arg0);
    }

    /**
     * @param arg0
     * @throws SAXException
     * @see org.xml.sax.ContentHandler#skippedEntity(java.lang.String)
     */
    public void skippedEntity(String arg0) throws SAXException {
        delegate.skippedEntity(arg0);
    }

    /**
     * @throws SAXException
     * @see org.xml.sax.ContentHandler#startDocument()
     */
    public void startDocument() throws SAXException {
        delegate.startDocument();
    }

    /**
     * @param ns
     * @param arg1
     * @param arg2
     * @param attributes
     * @throws SAXException
     * @see org.xml.sax.ContentHandler#startElement(java.lang.String, java.lang.String, java.lang.String, org.xml.sax.Attributes)
     */
    public void startElement(String ns, String arg1, String arg2,
            Attributes attributes) throws SAXException {
        if ("http://www.w3.org/1999/xhtml" == ns) {
            delegate.startElement(ns, arg1, arg2, filterAttributes(attributes));            
        } else {
            delegate.startElement(ns, arg1, arg2, attributes);
        }
    }

    private Attributes filterAttributes(Attributes attributes) throws SAXException {
        int len = attributes.getLength();
        for (int i = 0; i < len; i++) {
            String local = attributes.getLocalName(i);
            if (local.length() > 5 && local.startsWith("data-") && attributes.getURI(i) == "") {
                if (errorHandler != null) {
                    checkDataName(local);
                }
                AttributesImpl attributesImpl = new AttributesImpl();
                for (int j = 0; j < i; j++) {
                    attributesImpl.addAttribute(attributes.getURI(j), attributes.getLocalName(j), attributes.getQName(j), attributes.getType(j), attributes.getValue(j));
                }
                for (int k = i + 1; k < len; k++) {
                    String uri = attributes.getURI(k);
                    local = attributes.getLocalName(k);
                    if (local.length() > 5 && local.startsWith("data-") && "" == uri) {
                        checkDataName(local);
                    } else {
                        attributesImpl.addAttribute(uri, local, attributes.getQName(k), attributes.getType(k), attributes.getValue(k));                        
                    }
                }
                return attributesImpl;
            }
        }
        return attributes;
    }

    private void checkDataName(String local) throws SAXException {
        for (int i = 5; i < local.length(); i++) {
            char c = local.charAt(i);
            if (c >= 'A' && c <= 'Z') {
                errorHandler.error(new SAXParseException("\u201Cdata-*\u201D attributes must not have characters from the range \u201CA\u201D\u2026\u201CZ\u201D in the name.", locator));
            } else if (!NCName.isNCNameTrail(c)) {
                errorHandler.error(new SAXParseException("\u201Cdata-*\u201D attribute names must not XML 1.0 4th ed. plus Namspaces NCNames.", locator));                
            }
        }
    }

    /**
     * @param arg0
     * @param arg1
     * @throws SAXException
     * @see org.xml.sax.ContentHandler#startPrefixMapping(java.lang.String, java.lang.String)
     */
    public void startPrefixMapping(String arg0, String arg1)
            throws SAXException {
        delegate.startPrefixMapping(arg0, arg1);
    }

    
    
}

@@ -7085,19 +7085,18 @@
 es must 
-not
+be
  XML 1.0

fix copypaste error