itextpdf.jar is a component in iText 5 Java library to provide core functionalities. iText Java library allows you to generate and manage PDF documents.

The Source Code files are provided at iText GitHub site.

You can compile it to generate your JAR file, using pom.xml as the build configuration file.

The source code of itextpdf-5.5.14.jar is provided below:

⏎ com/itextpdf/text/html/HtmlUtilities.java

/*
 *
 * This file is part of the iText (R) project.
    Copyright (c) 1998-2020 iText Group NV
 * Authors: Bruno Lowagie, Paulo Soares, et al.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License version 3
 * as published by the Free Software Foundation with the addition of the
 * following permission added to Section 15 as permitted in Section 7(a):
 * FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
 * ITEXT GROUP. ITEXT GROUP DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
 * OF THIRD PARTY RIGHTS
 *
 * This program 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 Affero General Public License for more details.
 * You should have received a copy of the GNU Affero General Public License
 * along with this program; if not, see http://www.gnu.org/licenses or write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA, 02110-1301 USA, or download the license from the following URL:
 * http://itextpdf.com/terms-of-use/
 *
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU Affero General Public License.
 *
 * In accordance with Section 7(b) of the GNU Affero General Public License,
 * a covered work must retain the producer line in every PDF that is created
 * or manipulated using iText.
 *
 * You can be released from the requirements of the license by purchasing
 * a commercial license. Buying such a license is mandatory as soon as you
 * develop commercial activities involving the iText software without
 * disclosing the source code of your own applications.
 * These activities include: offering paid services to customers as an ASP,
 * serving PDFs on the fly in a web application, shipping iText with a closed
 * source product.
 *
 * For more information, please contact iText Software Corp. at this
 * address: sales@itextpdf.com
 */
package com.itextpdf.text.html;

import java.util.Properties;
import java.util.StringTokenizer;
import java.util.HashMap;
import com.itextpdf.text.BaseColor;
import com.itextpdf.text.Element;

/**
 * A class that contains some utilities to parse HTML attributes and content.
 * @since 5.0.6 (some of these methods used to be in the Markup class)
 * @deprecated since 5.5.2
 */
@Deprecated
public class HtmlUtilities {

	/**
	 * a default value for font-size 
     * @since 2.1.3
     */
	public static final float DEFAULT_FONT_SIZE = 12f;

    private static HashMap<String,Float> sizes = new HashMap<String,Float>();
    static {
        sizes.put("xx-small", new Float(4));
        sizes.put("x-small", new Float(6));
        sizes.put("small", new Float(8));
        sizes.put("medium", new Float(10));
        sizes.put("large", new Float(13));
        sizes.put("x-large", new Float(18));
        sizes.put("xx-large", new Float(26));
    }

	/**
	 * Parses a length.
	 * 
	 * @param string
	 *            a length in the form of an optional + or -, followed by a
	 *            number and a unit.
	 * @return a float
	 */

	public static float parseLength(String string) {
		return parseLength(string, DEFAULT_FONT_SIZE);
	}

	/**
	 * New method contributed by: Lubos Strapko
	 * 
	 * @since 2.1.3
	 */
	public static float parseLength(String string, float actualFontSize) {
		if (string == null)
			return 0f;
        Float fl = sizes.get(string.toLowerCase());
        if (fl != null)
            return fl.floatValue();
		int pos = 0;
		int length = string.length();
		boolean ok = true;
		while (ok && pos < length) {
			switch (string.charAt(pos)) {
			case '+':
			case '-':
			case '0':
			case '1':
			case '2':
			case '3':
			case '4':
			case '5':
			case '6':
			case '7':
			case '8':
			case '9':
			case '.':
				pos++;
				break;
			default:
				ok = false;
			}
		}
		if (pos == 0)
			return 0f;
		if (pos == length)
			return Float.parseFloat(string + "f");
		float f = Float.parseFloat(string.substring(0, pos) + "f");
		string = string.substring(pos);
		// inches
		if (string.startsWith("in")) {
			return f * 72f;
		}
		// centimeters
		if (string.startsWith("cm")) {
			return (f / 2.54f) * 72f;
		}
		// millimeters
		if (string.startsWith("mm")) {
			return (f / 25.4f) * 72f;
		}
		// picas
		if (string.startsWith("pc")) {
			return f * 12f;
		}
		// 1em is equal to the current font size
		if (string.startsWith("em")) {
			return f * actualFontSize;
		}
		// one ex is the x-height of a font (x-height is usually about half the
		// font-size)
		if (string.startsWith("ex")) {
			return f * actualFontSize / 2;
		}
		// default: we assume the length was measured in points
		return f;
	}

	/**
	 * Converts a <CODE>BaseColor</CODE> into a HTML representation of this <CODE>
	 * BaseColor</CODE>.
	 * 
	 * @param s
	 *            the <CODE>BaseColor</CODE> that has to be converted.
	 * @return the HTML representation of this <COLOR>BaseColor </COLOR>
	 */

	public static BaseColor decodeColor(String s) {
		if (s == null)
			return null;
		s = s.toLowerCase().trim();
		try {
			return WebColors.getRGBColor(s);
		}
		catch(IllegalArgumentException iae) {
			return null;
		}
	}

	/**
	 * This method parses a String with attributes and returns a Properties
	 * object.
	 * 
	 * @param string
	 *            a String of this form: 'key1="value1"; key2="value2";...
	 *            keyN="valueN" '
	 * @return a Properties object
	 */
	public static Properties parseAttributes(String string) {
		Properties result = new Properties();
		if (string == null)
			return result;
		StringTokenizer keyValuePairs = new StringTokenizer(string, ";");
		StringTokenizer keyValuePair;
		String key;
		String value;
		while (keyValuePairs.hasMoreTokens()) {
			keyValuePair = new StringTokenizer(keyValuePairs.nextToken(), ":");
			if (keyValuePair.hasMoreTokens())
				key = keyValuePair.nextToken().trim();
			else
				continue;
			if (keyValuePair.hasMoreTokens())
				value = keyValuePair.nextToken().trim();
			else
				continue;
			if (value.startsWith("\""))
				value = value.substring(1);
			if (value.endsWith("\""))
				value = value.substring(0, value.length() - 1);
			result.setProperty(key.toLowerCase(), value);
		}
		return result;
	}

	/**
	 * Removes the comments sections of a String.
	 * 
	 * @param string
	 *            the original String
	 * @param startComment
	 *            the String that marks the start of a Comment section
	 * @param endComment
	 *            the String that marks the end of a Comment section.
	 * @return the String stripped of its comment section
	 */
	public static String removeComment(String string, String startComment,
			String endComment) {
		StringBuffer result = new StringBuffer();
		int pos = 0;
		int end = endComment.length();
		int start = string.indexOf(startComment, pos);
		while (start > -1) {
			result.append(string.substring(pos, start));
			pos = string.indexOf(endComment, start) + end;
			start = string.indexOf(startComment, pos);
		}
		result.append(string.substring(pos));
		return result.toString();
	}
	
	/**
	 * Helper class that reduces the white space in a String
	 * @param content content containing whitespace
	 * @return the content without all unnecessary whitespace
	 */
	public static String eliminateWhiteSpace(String content) {
		// multiple spaces are reduced to one,
		// newlines are treated as spaces,
		// tabs, carriage returns are ignored.
		StringBuffer buf = new StringBuffer();
		int len = content.length();
		char character;
		boolean newline = false;
		for (int i = 0; i < len; i++) {
			switch (character = content.charAt(i)) {
			case ' ':
				if (!newline) {
					buf.append(character);
				}
				break;
			case '\n':
				if (i > 0) {
					newline = true;
					buf.append(' ');
				}
				break;
			case '\r':
				break;
			case '\t':
				break;
			default:
				newline = false;
				buf.append(character);
			}
		}
		return buf.toString();
	}

	/**
	 * A series of predefined font sizes.
	 * @since 5.0.6 (renamed)
	 */
	public final static int FONTSIZES[] = { 8, 10, 12, 14, 18, 24, 36 };
	
	/**
	 * Picks a font size from a series of predefined font sizes.
	 * @param value		the new value of a font, expressed as an index
	 * @param previous	the previous value of the font size
	 * @return	a new font size.
	 */
	public static int getIndexedFontSize(String value, String previous) {
		// the font is expressed as an index in a series of predefined font sizes
		int sIndex = 0;
		// the font is defined as a relative size
		if (value.startsWith("+") || value.startsWith("-")) {
			// fetch the previous value
			if (previous == null)
				previous = "12";
			int c = (int)Float.parseFloat(previous);
			// look for the nearest font size in the predefined series
			for (int k = FONTSIZES.length - 1; k >= 0; --k) {
				if (c >= FONTSIZES[k]) {
					sIndex = k;
					break;
				}
			}
			// retrieve the difference
			int diff =
				Integer.parseInt(value.startsWith("+") ?
					value.substring(1) : value);
			// apply the difference
			sIndex += diff;
		}
		// the font is defined as an index
		else {
			try {
				sIndex = Integer.parseInt(value) - 1;
			} catch (NumberFormatException nfe) {
				sIndex = 0;
			}
		}
		if (sIndex < 0)
			sIndex = 0;
		else if (sIndex >= FONTSIZES.length)
			sIndex = FONTSIZES.length - 1;
		return FONTSIZES[sIndex];
	}

	/**
	 * Translates a String value to an alignment value.
	 * (written by Norman Richards, integrated into iText by Bruno)
	 * @param	alignment a String (one of the ALIGN_ constants of this class)
	 * @return	an alignment value (one of the ALIGN_ constants of the Element interface) 
	 */
	public static int alignmentValue(String alignment) {
		if (alignment == null) return Element.ALIGN_UNDEFINED;
	    if (HtmlTags.ALIGN_CENTER.equalsIgnoreCase(alignment)) {
	        return Element.ALIGN_CENTER;
	    }
	    if (HtmlTags.ALIGN_LEFT.equalsIgnoreCase(alignment)) {
	        return Element.ALIGN_LEFT;
	    }
	    if (HtmlTags.ALIGN_RIGHT.equalsIgnoreCase(alignment)) {
	        return Element.ALIGN_RIGHT;
	    }
	    if (HtmlTags.ALIGN_JUSTIFY.equalsIgnoreCase(alignment)) {
	        return Element.ALIGN_JUSTIFIED;
	    }
	    if (HtmlTags.ALIGN_JUSTIFIED_ALL.equalsIgnoreCase(alignment)) {
	        return Element.ALIGN_JUSTIFIED_ALL;
	    }
	    if (HtmlTags.ALIGN_TOP.equalsIgnoreCase(alignment)) {
	        return Element.ALIGN_TOP;
	    }
	    if (HtmlTags.ALIGN_MIDDLE.equalsIgnoreCase(alignment)) {
	        return Element.ALIGN_MIDDLE;
	    }
	    if (HtmlTags.ALIGN_BOTTOM.equalsIgnoreCase(alignment)) {
	        return Element.ALIGN_BOTTOM;
	    }
	    if (HtmlTags.ALIGN_BASELINE.equalsIgnoreCase(alignment)) {
	        return Element.ALIGN_BASELINE;
	    }
	    return Element.ALIGN_UNDEFINED;
	}
}

⏎ com/itextpdf/text/html/HtmlUtilities.java

Or download all of them as a single archive file:

File name: itextpdf-5.5.14-fyi.zip
File size: 2163839 bytes
Release date: 2009-10-09
Download 

⇒ iText-2.1.6.jar - iText, a JAVA-PDF library

⇐ iText layout.jar Source Code

⇑ Download and Install iText Java Library

⇑⇑ iText for PDF Generation