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JTidy is a Java port of HTML Tidy, a HTML syntax checker and pretty printer. Like its non-Java cousin, JTidy can be used as a tool for cleaning up malformed and faulty HTML. In addition, JTidy provides a DOM interface to the document that is being processed, which effectively makes you able to use JTidy as a DOM parser for real-world HTML.
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/*
 *  Java HTML Tidy - JTidy
 *  HTML parser and pretty printer
 *
 *  Copyright (c) 1998-2000 World Wide Web Consortium (Massachusetts
 *  Institute of Technology, Institut National de Recherche en
 *  Informatique et en Automatique, Keio University). All Rights
 *  Reserved.
 *
 *  Contributing Author(s):
 *
 *     Dave Raggett 
 *     Andy Quick  (translation to Java)
 *     Gary L Peskin  (Java development)
 *     Sami Lempinen  (release management)
 *     Fabrizio Giustina 
 *
 *  The contributing author(s) would like to thank all those who
 *  helped with testing, bug fixes, and patience.  This wouldn't
 *  have been possible without all of you.
 *
 *  COPYRIGHT NOTICE:
 * 
 *  This software and documentation is provided "as is," and
 *  the copyright holders and contributing author(s) make no
 *  representations or warranties, express or implied, including
 *  but not limited to, warranties of merchantability or fitness
 *  for any particular purpose or that the use of the software or
 *  documentation will not infringe any third party patents,
 *  copyrights, trademarks or other rights. 
 *
 *  The copyright holders and contributing author(s) will not be
 *  liable for any direct, indirect, special or consequential damages
 *  arising out of any use of the software or documentation, even if
 *  advised of the possibility of such damage.
 *
 *  Permission is hereby granted to use, copy, modify, and distribute
 *  this source code, or portions hereof, documentation and executables,
 *  for any purpose, without fee, subject to the following restrictions:
 *
 *  1. The origin of this source code must not be misrepresented.
 *  2. Altered versions must be plainly marked as such and must
 *     not be misrepresented as being the original source.
 *  3. This Copyright notice may not be removed or altered from any
 *     source or altered source distribution.
 * 
 *  The copyright holders and contributing author(s) specifically
 *  permit, without fee, and encourage the use of this source code
 *  as a component for supporting the Hypertext Markup Language in
 *  commercial products. If you use this source code in a product,
 *  acknowledgment is not required but would be appreciated.
 *
 */
package org.w3c.tidy;

/**
 * Tag dictionary node. If the document uses just HTML 2.0 tags and attributes described it as HTML 2.0 Similarly for
 * HTML 3.2 and the 3 flavors of HTML 4.0. If there are proprietary tags and attributes then describe it as HTML
 * Proprietary. If it includes the xml-lang or xmlns attributes but is otherwise HTML 2.0, 3.2 or 4.0 then describe it
 * as one of the flavors of Voyager (strict, loose or frameset).
 * @author Dave Raggett [email protected] 
 * @author Andy Quick [email protected]  (translation to Java)
 * @author Fabrizio Giustina
 * @version $Revision: 502 $ ($Author: fgiust $)
 */
public class Dict
{

    /**
     * Content model: unknown.
     */
    public static final int CM_UNKNOWN = 0;

    /**
     * Content model: empty.
     */
    public static final int CM_EMPTY = (1 << 0);

    /**
     * Content model: html.
     */
    public static final int CM_HTML = (1 << 1);

    /**
     * Content model: head.
     */
    public static final int CM_HEAD = (1 << 2);

    /**
     * Content model: block.
     */
    public static final int CM_BLOCK = (1 << 3);

    /**
     * Content model: inline.
     */
    public static final int CM_INLINE = (1 << 4);

    /**
     * Content model: list.
     */
    public static final int CM_LIST = (1 << 5);

    /**
     * Content model: definition list.
     */
    public static final int CM_DEFLIST = (1 << 6);

    /**
     * Content model: table.
     */
    public static final int CM_TABLE = (1 << 7);

    /**
     * Content model: rowgroup.
     */
    public static final int CM_ROWGRP = (1 << 8);

    /**
     * Content model: row.
     */
    public static final int CM_ROW = (1 << 9);

    /**
     * Content model: field.
     */
    public static final int CM_FIELD = (1 << 10);

    /**
     * Content model: object.
     */
    public static final int CM_OBJECT = (1 << 11);

    /**
     * Content model: param.
     */
    public static final int CM_PARAM = (1 << 12);

    /**
     * Content model: frames.
     */
    public static final int CM_FRAMES = (1 << 13);

    /**
     * Content model: heading.
     */
    public static final int CM_HEADING = (1 << 14);

    /**
     * Content model: opt.
     */
    public static final int CM_OPT = (1 << 15);

    /**
     * Content model: img.
     */
    public static final int CM_IMG = (1 << 16);

    /**
     * Content model: mixed.
     */
    public static final int CM_MIXED = (1 << 17);

    /**
     * Content model: no indent.
     */
    public static final int CM_NO_INDENT = (1 << 18);

    /**
     * Content model: obsolete.
     */
    public static final int CM_OBSOLETE = (1 << 19);

    /**
     * Content model: new.
     */
    public static final int CM_NEW = (1 << 20);

    /**
     * Content model: omitst.
     */
    public static final int CM_OMITST = (1 << 21);

    /**
     * Version: unknown.
     */
    public static final short VERS_UNKNOWN = 0;

    /**
     * Version: html 2.0.
     */
    public static final short VERS_HTML20 = 1;

    /**
     * Version: html 3.2.
     */
    public static final short VERS_HTML32 = 2;

    /**
     * Version: html 4.0 strict.
     */
    public static final short VERS_HTML40_STRICT = 4;

    /**
     * Version: html 4.0 transitional.
     */
    public static final short VERS_HTML40_LOOSE = 8;

    /**
     * Version: html 4.0 frameset.
     */
    public static final short VERS_FRAMESET = 16;

    /**
     * Version: xml.
     */
    public static final short VERS_XML = 32;

    /**
     * Version: netscape.
     */
    public static final short VERS_NETSCAPE = 64;

    /**
     * Version: microsoft.
     */
    public static final short VERS_MICROSOFT = 128;

    /**
     * Version: sun.
     */
    public static final short VERS_SUN = 256;

    /**
     * Version: malformed.
     */
    public static final short VERS_MALFORMED = 512;

    /**
     * Version: xhtml 1.1.
     */
    public static final short VERS_XHTML11 = 1024;

    /**
     * Version: xhtml basic.
     */
    public static final short VERS_BASIC = 2048;

    /**
     * all tags and attributes are ok in proprietary version of HTML.
     */
    public static final short VERS_PROPRIETARY = (VERS_NETSCAPE | VERS_MICROSOFT | VERS_SUN);

    /**
     * tags/attrs in HTML4 but not in earlier version.
     */
    public static final short VERS_HTML40 = (VERS_HTML40_STRICT | VERS_HTML40_LOOSE | VERS_FRAMESET);

    /**
     * tags/attrs which are in all versions of HTML except strict.
     */
    public static final short VERS_LOOSE = (VERS_HTML32 | VERS_HTML40_LOOSE | VERS_FRAMESET);

    /**
     * tags/attrs in HTML 4 loose and frameset.
     */
    public static final short VERS_IFRAME = (VERS_HTML40_LOOSE | VERS_FRAMESET);

    /**
     * tags/attrs in all versions from HTML 3.2 onwards.
     */
    public static final short VERS_FROM32 = (VERS_HTML40_STRICT | VERS_LOOSE);

    /**
     * versions with on... attributes.
     */
    public static final short VERS_EVENTS = (VERS_HTML40 | VERS_XHTML11);

    /**
     * tags/attrs in any version.
     */
    public static final short VERS_ALL = (VERS_HTML20 | VERS_HTML32 | VERS_HTML40 | VERS_XHTML11 | VERS_BASIC);

    /**
     * types of tags that the user can define: empty tag.
     */
    public static final short TAGTYPE_EMPTY = 1;

    /**
     * types of tags that the user can define: inline tag.
     */
    public static final short TAGTYPE_INLINE = 2;

    /**
     * types of tags that the user can define: block tag.
     */
    public static final short TAGTYPE_BLOCK = 4;

    /**
     * types of tags that the user can define: pre tag.
     */
    public static final short TAGTYPE_PRE = 8;

    /**
     * Tag name.
     */
    protected String name;

    /**
     * Version in which this tag is defined.
     */
    protected short versions;

    /**
     * model (CM_* constants).
     */
    protected int model;

    /**
     * Parser for this tag.
     */
    private Parser parser;

    /**
     * Validator for this tag.
     */
    private TagCheck chkattrs;

    /**
     * Instantiates a new Tag definition.
     * @param name tag name
     * @param versions version in which this tag is defined
     * @param model model (CM_* constants)
     * @param parser parser for this tag
     * @param chkattrs validator for this tag (can be null)
     */
    public Dict(String name, short versions, int model, Parser parser, TagCheck chkattrs)
    {
        this.name = name;
        this.versions = versions;
        this.model = model;
        this.parser = parser;
        this.chkattrs = chkattrs;
    }

    /**
     * Getter for chkattrs.
     * @return Returns the chkattrs.
     */
    public TagCheck getChkattrs()
    {
        return this.chkattrs;
    }

    /**
     * Getter for model.
     * @return Returns the model.
     */
    public int getModel()
    {
        return this.model;
    }

    /**
     * Getter for name.
     * @return Returns the name.
     */
    public String getName()
    {
        return this.name;
    }

    /**
     * Getter for parser.
     * @return Returns the parser.
     */
    public Parser getParser()
    {
        return this.parser;
    }

    /**
     * Setter for chkattrs.
     * @param chkattrs The chkattrs to set.
     */
    public void setChkattrs(TagCheck chkattrs)
    {
        this.chkattrs = chkattrs;
    }
    /**
     * Getter for versions.
     * @return Returns the versions.
     */
    public short getVersions()
    {
        return this.versions;
    }
    /**
     * Setter for parser.
     * @param parser The parser to set.
     */
    public void setParser(Parser parser)
    {
        this.parser = parser;
    }
}