// $Header: /home/cvs/jakarta-jmeter/src/htmlparser/org/htmlparser/tags/EndTag.java,v 1.2 2004/02/10 13:41:07 woolfel Exp $
/*
 * ====================================================================
 * Copyright 2002-2004 The Apache Software Foundation.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 */

// The developers of JMeter and Apache are greatful to the developers
// of HTMLParser for giving Apache Software Foundation a non-exclusive
// license. The performance benefits of HTMLParser are clear and the
// users of JMeter will benefit from the hard work the HTMLParser
// team. For detailed information about HTMLParser, the project is
// hosted on sourceforge at http://htmlparser.sourceforge.net/.
//
// HTMLParser was originally created by Somik Raha in 2000. Since then
// a healthy community of users has formed and helped refine the
// design so that it is able to tackle the difficult task of parsing
// dirty HTML. Derrick Oswald is the current lead developer and was kind
// enough to assist JMeter.

package org.htmlparser.tags;

import org.htmlparser.Node;
import org.htmlparser.tags.data.TagData;
import org.htmlparser.visitors.NodeVisitor;
/**
 * EndTag can identify closing tags, like </A>, </FORM>, etc.
 */
public class EndTag extends Tag
{
    public final static String TYPE = "END_TAG";
    public final static int ENDTAG_BEFORE_PARSING_STATE = 0;
    public final static int ENDTAG_WAIT_FOR_SLASH_STATE = 1;
    public final static int ENDTAG_BEGIN_PARSING_STATE = 2;
    public final static int ENDTAG_FINISHED_PARSING_STATE = 3;

    /**
     * Constructor takes 3 arguments to construct an EndTag object.
     * @param nodeBegin Beginning position of the end tag
     * @param nodeEnd Ending position of the end tag
     * @param tagContents Text contents of the tag
     */
    public EndTag(TagData tagData)
    {
        super(tagData);
    }
    /**
     * Locate the end tag withing the input string, by parsing from the given position
     * @param input Input String
     * @param position Position to start parsing from
     */
    public static Node find(String input, int position)
    {
        int state = ENDTAG_BEFORE_PARSING_STATE;
        StringBuffer tagContents = new StringBuffer();
        int tagBegin = 0;
        int tagEnd = 0;
        int inputLen = input.length();
        char ch;
        int i;
        for (i = position;
            (i < inputLen && state != ENDTAG_FINISHED_PARSING_STATE);
            i++)
        {
            ch = input.charAt(i);
            if (ch == '>' && state == ENDTAG_BEGIN_PARSING_STATE)
            {
                state = ENDTAG_FINISHED_PARSING_STATE;
                tagEnd = i;
            }
            if (state == ENDTAG_BEGIN_PARSING_STATE)
            {
                tagContents.append(ch);
            }
            if (state == ENDTAG_WAIT_FOR_SLASH_STATE)
            {
                if (ch == '/')
                {
                    state = ENDTAG_BEGIN_PARSING_STATE;
                }
                else
                    return null;
            }

            if (ch == '<')
            {
                if (state == ENDTAG_BEFORE_PARSING_STATE)
                {
                    // Transition from State 0 to State 1 - Record data till > is encountered
                    tagBegin = i;
                    state = ENDTAG_WAIT_FOR_SLASH_STATE;
                }
                else if (state == ENDTAG_BEGIN_PARSING_STATE)
                {
                    state = ENDTAG_FINISHED_PARSING_STATE;
                    tagEnd = i;
                }
            }
            else if (state == ENDTAG_BEFORE_PARSING_STATE)
                // text before the end tag
                return (null);
        }
        // If parsing did not complete, it might be possible to accept
        if (state == ENDTAG_BEGIN_PARSING_STATE)
        {
            tagEnd = i;
            state = ENDTAG_FINISHED_PARSING_STATE;
        }
        if (state == ENDTAG_FINISHED_PARSING_STATE)
            return new EndTag(
                new TagData(tagBegin, tagEnd, tagContents.toString(), input));
        else
            return null;
    }
    public String toPlainTextString()
    {
        return "";
    }
    public String toHtml()
    {
        return "";
    }
    public String toString()
    {
        return "EndTag : "
            + tagContents
            + "; begins at : "
            + elementBegin()
            + "; ends at : "
            + elementEnd();
    }

    public void accept(NodeVisitor visitor)
    {
        visitor.visitEndTag(this);
    }

    public String getType()
    {
        return TYPE;
    }

}