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/* * Copyright (c) 1998, 2008, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation.  Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */package javax.swing.text.html; import java.io.*;import java.util.Hashtable;import javax.swing.text.AttributeSet;import javax.swing.text.StyleConstants;import javax.swing.text.StyleContext; /** * Constants used in the <code>HTMLDocument</code>.  These * are basically tag and attribute definitions. * * @author  Timothy Prinzing * @author  Sunita Mani * */public class HTML {     /**     * Typesafe enumeration for an HTML tag.  Although the     * set of HTML tags is a closed set, we have left the     * set open so that people can add their own tag types     * to their custom parser and still communicate to the     * reader.     */    public static class Tag {         /** @since 1.3 */        public Tag() {}         /**         * Creates a new <code>Tag</code> with the specified <code>id</code>,         * and with <code>causesBreak</code> and <code>isBlock</code>         * set to <code>false</code>.         *         * @param id  the id of the new tag         */        protected Tag(String id) {            this(id, false, false);        }         /**         * Creates a new <code>Tag</code> with the specified <code>id</code>;         * <code>causesBreak</code> and <code>isBlock</code> are defined         * by the user.         *         * @param id the id of the new tag         * @param causesBreak  <code>true</code> if this tag         *    causes a break to the flow of data         * @param isBlock <code>true</code> if the tag is used         *    to add structure to a document         */        protected Tag(String id, boolean causesBreak, boolean isBlock) {            name = id;            this.breakTag = causesBreak;            this.blockTag = isBlock;        }         /**         * Returns <code>true</code> if this tag is a block         * tag, which is a tag used to add structure to a         * document.         *         * @return <code>true</code> if this tag is a block         *   tag, otherwise returns <code>false</code>         */        public boolean isBlock() {            return blockTag;        }         /**         * Returns <code>true</code> if this tag causes a         * line break to the flow of data, otherwise returns         * <code>false</code>.         *         * @return <code>true</code> if this tag causes a         *   line break to the flow of data, otherwise returns         *   <code>false</code>         */        public boolean breaksFlow() {            return breakTag;        }         /**         * Returns <code>true</code> if this tag is pre-formatted,         * which is true if the tag is either <code>PRE</code> or         * <code>TEXTAREA</code>.         *         * @return <code>true</code> if this tag is pre-formatted,         *   otherwise returns <code>false</code>         */        public boolean isPreformatted() {            return (this == PRE || this == TEXTAREA);        }         /**         * Returns the string representation of the         * tag.         *         * @return the <code>String</code> representation of the tag         */        public String toString() {            return name;        }         /**         * Returns <code>true</code> if this tag is considered to be a paragraph         * in the internal HTML model. <code>false</code> - otherwise.         *         * @return <code>true</code> if this tag is considered to be a paragraph         *         in the internal HTML model. <code>false</code> - otherwise.         * @see HTMLDocument.HTMLReader.ParagraphAction         */        boolean isParagraph() {            return (                this == P                   || this == IMPLIED                   || this == DT                   || this == H1                   || this == H2                   || this == H3                   || this == H4                   || this == H5                   || this == H6            );        }         boolean blockTag;        boolean breakTag;        String name;        boolean unknown;         // --- Tag Names -----------------------------------         public static final Tag A = new Tag("a");        public static final Tag ADDRESS = new Tag("address");        public static final Tag APPLET = new Tag("applet");        public static final Tag AREA = new Tag("area");        public static final Tag B = new Tag("b");        public static final Tag BASE = new Tag("base");        public static final Tag BASEFONT = new Tag("basefont");        public static final Tag BIG = new Tag("big");        public static final Tag BLOCKQUOTE = new Tag("blockquote", true, true);        public static final Tag BODY = new Tag("body", true, true);        public static final Tag BR = new Tag("br", true, false);        public static final Tag CAPTION = new Tag("caption");        public static final Tag CENTER = new Tag("center", true, false);        public static final Tag CITE = new Tag("cite");        public static final Tag CODE = new Tag("code");        public static final Tag DD = new Tag("dd", true, true);        public static final Tag DFN = new Tag("dfn");        public static final Tag DIR = new Tag("dir", true, true);        public static final Tag DIV = new Tag("div", true, true);        public static final Tag DL = new Tag("dl", true, true);        public static final Tag DT = new Tag("dt", true, true);        public static final Tag EM = new Tag("em");        public static final Tag FONT = new Tag("font");        public static final Tag FORM = new Tag("form", true, false);        public static final Tag FRAME = new Tag("frame");        public static final Tag FRAMESET = new Tag("frameset");        public static final Tag H1 = new Tag("h1", true, true);        public static final Tag H2 = new Tag("h2", true, true);        public static final Tag H3 = new Tag("h3", true, true);        public static final Tag H4 = new Tag("h4", true, true);        public static final Tag H5 = new Tag("h5", true, true);        public static final Tag H6 = new Tag("h6", true, true);        public static final Tag HEAD = new Tag("head", true, true);        public static final Tag HR = new Tag("hr", true, false);        public static final Tag HTML = new Tag("html", true, false);        public static final Tag I = new Tag("i");        public static final Tag IMG = new Tag("img");        public static final Tag INPUT = new Tag("input");        public static final Tag ISINDEX = new Tag("isindex", true, false);        public static final Tag KBD = new Tag("kbd");        public static final Tag LI = new Tag("li", true, true);        public static final Tag LINK = new Tag("link");        public static final Tag MAP = new Tag("map");        public static final Tag MENU = new Tag("menu", true, true);        public static final Tag META = new Tag("meta");        /*public*/ static final Tag NOBR = new Tag("nobr");        public static final Tag NOFRAMES = new Tag("noframes", true, true);        public static final Tag OBJECT = new Tag("object");        public static final Tag OL = new Tag("ol", true, true);        public static final Tag OPTION = new Tag("option");        public static final Tag P = new Tag("p", true, true);        public static final Tag PARAM = new Tag("param");        public static final Tag PRE = new Tag("pre", true, true);        public static final Tag SAMP = new Tag("samp");        public static final Tag SCRIPT = new Tag("script");        public static final Tag SELECT = new Tag("select");        public static final Tag SMALL = new Tag("small");        public static final Tag SPAN = new Tag("span");        public static final Tag STRIKE = new Tag("strike");        public static final Tag S = new Tag("s");        public static final Tag STRONG = new Tag("strong");        public static final Tag STYLE = new Tag("style");        public static final Tag SUB = new Tag("sub");        public static final Tag SUP = new Tag("sup");        public static final Tag TABLE = new Tag("table", false, true);        public static final Tag TD = new Tag("td", true, true);        public static final Tag TEXTAREA = new Tag("textarea");        public static final Tag TH = new Tag("th", true, true);        public static final Tag TITLE = new Tag("title", true, true);        public static final Tag TR = new Tag("tr", false, true);        public static final Tag TT = new Tag("tt");        public static final Tag U = new Tag("u");        public static final Tag UL = new Tag("ul", true, true);        public static final Tag VAR = new Tag("var");         /**         * All text content must be in a paragraph element.         * If a paragraph didn't exist when content was         * encountered, a paragraph is manufactured.         * <p>         * This is a tag synthesized by the HTML reader.         * Since elements are identified by their tag type,         * we create a some fake tag types to mark the elements         * that were manufactured.         */        public static final Tag IMPLIED = new Tag("p-implied");         /**         * All text content is labeled with this tag.         * <p>         * This is a tag synthesized by the HTML reader.         * Since elements are identified by their tag type,         * we create a some fake tag types to mark the elements         * that were manufactured.         */        public static final Tag CONTENT = new Tag("content");         /**         * All comments are labeled with this tag.         * <p>         * This is a tag synthesized by the HTML reader.         * Since elements are identified by their tag type,         * we create a some fake tag types to mark the elements         * that were manufactured.         */        public static final Tag COMMENT = new Tag("comment");         static final Tag allTags[]  = {            A, ADDRESS, APPLET, AREA, B, BASE, BASEFONT, BIG,            BLOCKQUOTE, BODY, BR, CAPTION, CENTER, CITE, CODE,            DD, DFN, DIR, DIV, DL, DT, EM, FONT, FORM, FRAME,            FRAMESET, H1, H2, H3, H4, H5, H6, HEAD, HR, HTML,            I, IMG, INPUT, ISINDEX, KBD, LI, LINK, MAP, MENU,            META, NOBR, NOFRAMES, OBJECT, OL, OPTION, P, PARAM,            PRE, SAMP, SCRIPT, SELECT, SMALL, SPAN, STRIKE, S,            STRONG, STYLE, SUB, SUP, TABLE, TD, TEXTAREA,            TH, TITLE, TR, TT, U, UL, VAR        };         static {            // Force HTMLs static initialize to be loaded.            getTag("html");        }    }     // There is no unique instance of UnknownTag, so we allow it to be    // Serializable.    public static class UnknownTag extends Tag implements Serializable {         /**         * Creates a new <code>UnknownTag</code> with the specified         * <code>id</code>.         * @param id the id of the new tag         */        public UnknownTag(String id) {            super(id);        }         /**         * Returns the hash code which corresponds to the string         * for this tag.         */        public int hashCode() {            return toString().hashCode();        }         /**         * Compares this object to the specifed object.         * The result is <code>true</code> if and only if the argument is not         * <code>null</code> and is an <code>UnknownTag</code> object         * with the same name.         *         * @param     obj   the object to compare this tag with         * @return    <code>true</code> if the objects are equal;         *            <code>false</code> otherwise         */        public boolean equals(Object obj) {            if (obj instanceof UnknownTag) {                return toString().equals(obj.toString());            }            return false;        }         private void writeObject(java.io.ObjectOutputStream s)                     throws IOException {            s.defaultWriteObject();            s.writeBoolean(blockTag);            s.writeBoolean(breakTag);            s.writeBoolean(unknown);            s.writeObject(name);        }         private void readObject(ObjectInputStream s)            throws ClassNotFoundException, IOException {            s.defaultReadObject();            blockTag = s.readBoolean();            breakTag = s.readBoolean();            unknown = s.readBoolean();            name = (String)s.readObject();        }    }     /**     * Typesafe enumeration representing an HTML     * attribute.     */    public static final class Attribute {         /**         * Creates a new <code>Attribute</code> with the specified         * <code>id</code>.         *         * @param id the id of the new <code>Attribute</code>         */        Attribute(String id) {            name = id;        }         /**         * Returns the string representation of this attribute.         * @return the string representation of this attribute         */        public String toString() {            return name;        }         private String name;         public static final Attribute SIZE = new Attribute("size");        public static final Attribute COLOR = new Attribute("color");        public static final Attribute CLEAR = new Attribute("clear");        public static final Attribute BACKGROUND = new Attribute("background");        public static final Attribute BGCOLOR = new Attribute("bgcolor");        public static final Attribute TEXT = new Attribute("text");        public static final Attribute LINK = new Attribute("link");        public static final Attribute VLINK = new Attribute("vlink");        public static final Attribute ALINK = new Attribute("alink");        public static final Attribute WIDTH = new Attribute("width");        public static final Attribute HEIGHT = new Attribute("height");        public static final Attribute ALIGN = new Attribute("align");        public static final Attribute NAME = new Attribute("name");        public static final Attribute HREF = new Attribute("href");        public static final Attribute REL = new Attribute("rel");        public static final Attribute REV = new Attribute("rev");        public static final Attribute TITLE = new Attribute("title");        public static final Attribute TARGET = new Attribute("target");        public static final Attribute SHAPE = new Attribute("shape");        public static final Attribute COORDS = new Attribute("coords");        public static final Attribute ISMAP = new Attribute("ismap");        public static final Attribute NOHREF = new Attribute("nohref");        public static final Attribute ALT = new Attribute("alt");        public static final Attribute ID = new Attribute("id");        public static final Attribute SRC = new Attribute("src");        public static final Attribute HSPACE = new Attribute("hspace");        public static final Attribute VSPACE = new Attribute("vspace");        public static final Attribute USEMAP = new Attribute("usemap");        public static final Attribute LOWSRC = new Attribute("lowsrc");        public static final Attribute CODEBASE = new Attribute("codebase");        public static final Attribute CODE = new Attribute("code");        public static final Attribute ARCHIVE = new Attribute("archive");        public static final Attribute VALUE = new Attribute("value");        public static final Attribute VALUETYPE = new Attribute("valuetype");        public static final Attribute TYPE = new Attribute("type");        public static final Attribute CLASS = new Attribute("class");        public static final Attribute STYLE = new Attribute("style");        public static final Attribute LANG = new Attribute("lang");        public static final Attribute FACE = new Attribute("face");        public static final Attribute DIR = new Attribute("dir");        public static final Attribute DECLARE = new Attribute("declare");        public static final Attribute CLASSID = new Attribute("classid");        public static final Attribute DATA = new Attribute("data");        public static final Attribute CODETYPE = new Attribute("codetype");        public static final Attribute STANDBY = new Attribute("standby");        public static final Attribute BORDER = new Attribute("border");        public static final Attribute SHAPES = new Attribute("shapes");        public static final Attribute NOSHADE = new Attribute("noshade");        public static final Attribute COMPACT = new Attribute("compact");        public static final Attribute START = new Attribute("start");        public static final Attribute ACTION = new Attribute("action");        public static final Attribute METHOD = new Attribute("method");        public static final Attribute ENCTYPE = new Attribute("enctype");        public static final Attribute CHECKED = new Attribute("checked");        public static final Attribute MAXLENGTH = new Attribute("maxlength");        public static final Attribute MULTIPLE = new Attribute("multiple");        public static final Attribute SELECTED = new Attribute("selected");        public static final Attribute ROWS = new Attribute("rows");        public static final Attribute COLS = new Attribute("cols");        public static final Attribute DUMMY = new Attribute("dummy");        public static final Attribute CELLSPACING = new Attribute("cellspacing");        public static final Attribute CELLPADDING = new Attribute("cellpadding");        public static final Attribute VALIGN = new Attribute("valign");        public static final Attribute HALIGN = new Attribute("halign");        public static final Attribute NOWRAP = new Attribute("nowrap");        public static final Attribute ROWSPAN = new Attribute("rowspan");        public static final Attribute COLSPAN = new Attribute("colspan");        public static final Attribute PROMPT = new Attribute("prompt");        public static final Attribute HTTPEQUIV = new Attribute("http-equiv");        public static final Attribute CONTENT = new Attribute("content");        public static final Attribute LANGUAGE = new Attribute("language");        public static final Attribute VERSION = new Attribute("version");        public static final Attribute N = new Attribute("n");        public static final Attribute FRAMEBORDER = new Attribute("frameborder");        public static final Attribute MARGINWIDTH = new Attribute("marginwidth");        public static final Attribute MARGINHEIGHT = new Attribute("marginheight");        public static final Attribute SCROLLING = new Attribute("scrolling");        public static final Attribute NORESIZE = new Attribute("noresize");        public static final Attribute ENDTAG = new Attribute("endtag");        public static final Attribute COMMENT = new Attribute("comment");        static final Attribute MEDIA = new Attribute("media");         static final Attribute allAttributes[] = {            FACE,            COMMENT,            SIZE,            COLOR,            CLEAR,            BACKGROUND,            BGCOLOR,            TEXT,            LINK,            VLINK,            ALINK,            WIDTH,            HEIGHT,            ALIGN,            NAME,            HREF,            REL,            REV,            TITLE,            TARGET,            SHAPE,            COORDS,            ISMAP,            NOHREF,            ALT,            ID,            SRC,            HSPACE,            VSPACE,            USEMAP,            LOWSRC,            CODEBASE,            CODE,            ARCHIVE,            VALUE,            VALUETYPE,            TYPE,            CLASS,            STYLE,            LANG,            DIR,            DECLARE,            CLASSID,            DATA,            CODETYPE,            STANDBY,            BORDER,            SHAPES,            NOSHADE,            COMPACT,            START,

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