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The source code

// $Header: /home/cvs/jakarta-jmeter/src/htmlparser/org/htmlparser/parserHelper/AttributeParser.java,v 1.3 2004/02/10 13:41:08 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.parserHelper;

import java.util.Hashtable;
import java.util.StringTokenizer;

import org.htmlparser.tags.Tag;


/**
 * To change this generated comment edit the template variable "typecomment":
 * Window>Preferences>Java>Templates.
 * To enable and disable the creation of type comments go to
 * Window>Preferences>Java>Code Generation.
 * @author Somik Raha, Kaarle Kaila
 * @version 7 AUG 2001
 */
public class AttributeParser
{
    private final String delima = " \t\r\n\f=\"'>";
    private final String delimb = " \t\r\n\f\"'>";
    private final char doubleQuote = '\"';
    private final char singleQuote = '\'';
    private String delim;

    /**
    * Method to break the tag into pieces.
    * @param returns a Hastable with elements containing the
    * pieces of the tag. The tag-name has the value field set to
    * the constant Tag.TAGNAME. In addition the tag-name is
    * stored into the Hashtable with the name Tag.TAGNAME
    * where the value is the name of the tag.
    * Tag parameters without value
    * has the value "". Parameters with value are represented
    * in the Hastable by a name/value pair.
    * As html is case insensitive but Hastable is not are all
    * names converted into UPPERCASE to the Hastable
    * E.g extract the href values from A-tag's and print them
    * 
    *
    *    Tag tag;
    *    Hashtable h;
    *    String tmp;
    *    try {
    *        NodeReader in = new NodeReader(new FileReader(path),2048);
    *        Parser p = new Parser(in);
    *        Enumeration en = p.elements();
    *        while (en.hasMoreElements()) {
    *            try {
    *                tag = (Tag)en.nextElement();
    *                h = tag.parseParameters();
    *                tmp = (String)h.get(tag.TAGNAME);
    *                if (tmp != null && tmp.equalsIgnoreCase("A")) {;
    *                    System.out.println("URL is :" + h.get("HREF"));
    *                }
    *            } catch (ClassCastException ce){}
    *        }
    *    }
    *    catch (IOException ie) {
    *        ie.printStackTrace();
    *    }
    * 
* */ public Hashtable parseAttributes(Tag tag) { Hashtable h = new Hashtable(); String element, name, value, nextPart = null; String empty = null; name = null; value = null; element = null; boolean waitingForEqual = false; delim = delima; StringTokenizer tokenizer = new StringTokenizer(tag.getText(), delim, true); while (true) { nextPart = getNextPart(tokenizer, delim); delim = delima; if (element == null && nextPart != null && !nextPart.equals("=")) { element = nextPart; putDataIntoTable(h, element, null, true); } else { if (nextPart != null) { if (name == null) { if (0 < nextPart.length() && !nextPart.substring(0, 1).equals(" ")) { name = nextPart; waitingForEqual = true; } } else { if (waitingForEqual) { if (nextPart.equals("=")) { waitingForEqual = false; delim = delimb; } else { putDataIntoTable(h, name, "", false); name = nextPart; value = null; } } if (!waitingForEqual && !nextPart.equals("=")) { value = nextPart; putDataIntoTable(h, name, value, false); name = null; value = null; } } } else { if (name != null) { if (name.equals("/")) { putDataIntoTable(h, Tag.EMPTYTAG, "", false); } else { putDataIntoTable(h, name, "", false); } name = null; value = null; } break; } } } if (null == element) // handle no tag contents putDataIntoTable(h, "", null, true); return h; } private String getNextPart(StringTokenizer tokenizer, String deli) { String tokenAccumulator = null; boolean isDoubleQuote = false; boolean isSingleQuote = false; boolean isDataReady = false; String currentToken; while (isDataReady == false && tokenizer.hasMoreTokens()) { currentToken = tokenizer.nextToken(deli); // // First let's combine tokens that are inside "" or '' // if (isDoubleQuote || isSingleQuote) { if (isDoubleQuote && currentToken.charAt(0) == doubleQuote) { isDoubleQuote = false; isDataReady = true; } else if ( isSingleQuote && currentToken.charAt(0) == singleQuote) { isSingleQuote = false; isDataReady = true; } else { tokenAccumulator += currentToken; continue; } } else if (currentToken.charAt(0) == doubleQuote) { isDoubleQuote = true; tokenAccumulator = ""; continue; } else if (currentToken.charAt(0) == singleQuote) { isSingleQuote = true; tokenAccumulator = ""; continue; } else tokenAccumulator = currentToken; if (tokenAccumulator.equals(currentToken)) { if (delim.indexOf(tokenAccumulator) >= 0) { if (tokenAccumulator.equals("=")) { isDataReady = true; } } else { isDataReady = true; } } else isDataReady = true; } return tokenAccumulator; } private void putDataIntoTable( Hashtable h, String name, String value, boolean isName) { if (isName && value == null) value = Tag.TAGNAME; else if (value == null) value = ""; // Hashtable does not accept nulls if (isName) { // store tagname as tag.TAGNAME,tag h.put(value, name.toUpperCase()); } else { // store tag parameters as NAME, value h.put(name.toUpperCase(), value); } } }
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