iText 5 itextpdf.jar Source Code

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:

✍: FYIcenter.com

com/itextpdf/text/pdf/languages/IndicLigaturizer.java

/*
 *
 * This file is part of the iText (R) project.
    Copyright (c) 1998-2020 iText Group NV
 * Authors: Ram Narayan, Bruno Lowagie, 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.pdf.languages;

/**
 * Superclass for processors that can convert a String of bytes in an Indic
 * language to a String in the same language of which the bytes are reordered
 * for rendering using a font that contains the necessary glyphs.
 */
public abstract class IndicLigaturizer implements LanguageProcessor {

	// Hashtable Indexes
	public static final int MATRA_AA = 0;
	public static final int MATRA_I = 1;
	public static final int MATRA_E = 2;
	public static final int MATRA_AI = 3;
	public static final int MATRA_HLR = 4;
	public static final int MATRA_HLRR = 5;
	public static final int LETTER_A = 6;
	public static final int LETTER_AU = 7;
	public static final int LETTER_KA = 8;
	public static final int LETTER_HA = 9;
	public static final int HALANTA = 10;

	/**
	 * The table mapping specific character indexes to the characters in a
	 * specific language.
	 */
	protected char[] langTable;

	/**
	 * Reorders the bytes in a String making Indic ligatures
	 * 
	 * @param s
	 *            the original String
	 * @return the ligaturized String
	 */
	public String process(String s) {
		if (s == null || s.length() == 0)
			return "";
		StringBuilder res = new StringBuilder();

		for (int i = 0; i < s.length(); i++) {
			char letter = s.charAt(i);

			if (IsVyanjana(letter) || IsSwaraLetter(letter)) {
				res.append(letter);
			} else if (IsSwaraMatra(letter)) {
				int prevCharIndex = res.length() - 1;

				if (prevCharIndex >= 0) {
					// a Halanta followed by swara matra, causes it to lose its
					// identity
					if (res.charAt(prevCharIndex) == langTable[HALANTA])
						res.deleteCharAt(prevCharIndex);

					res.append(letter);
					int prevPrevCharIndex = res.length() - 2;

					if (letter == langTable[MATRA_I] && prevPrevCharIndex >= 0)
						swap(res, prevPrevCharIndex, res.length() - 1);
				} else {
					res.append(letter);
				}
			} else {
				res.append(letter);
			}
		}

		return res.toString();
	}

	/**
	 * Indic languages are written from right to left.
	 * 
	 * @return false
	 * @see com.itextpdf.text.pdf.languages.LanguageProcessor#isRTL()
	 */
	public boolean isRTL() {
		return false;
	}

	/**
	 * Checks if a character is vowel letter.
	 * 
	 * @param ch
	 *            the character that needs to be checked
	 * @return true if the characters is a vowel letter
	 */
	protected boolean IsSwaraLetter(char ch) {
		return (ch >= langTable[LETTER_A] && ch <= langTable[LETTER_AU]);
	}

	/**
	 * Checks if a character is vowel sign.
	 * 
	 * @param ch
	 *            the character that needs to be checked
	 * @return true if the characters is a vowel sign
	 */
	protected boolean IsSwaraMatra(char ch) {
		return ((ch >= langTable[MATRA_AA] && ch <= langTable[MATRA_AI])
				|| ch == langTable[MATRA_HLR] || ch == langTable[MATRA_HLRR]);
	}

	/**
	 * Checks if a character is consonant letter.
	 * 
	 * @param ch
	 *            the character that needs to be checked
	 * @return true if the chracter is a consonant letter
	 */
	protected boolean IsVyanjana(char ch) {
		return (ch >= langTable[LETTER_KA] && ch <= langTable[LETTER_HA]);
	}

	/**
	 * Swaps two characters in a StringBuilder object
	 * 
	 * @param s
	 *            the StringBuilder
	 * @param i
	 *            the index of one character
	 * @param j
	 *            the index of the other character
	 */
	private static void swap(StringBuilder s, int i, int j) {
		char temp = s.charAt(i);
		s.setCharAt(i, s.charAt(j));
		s.setCharAt(j, temp);
	}
}

com/itextpdf/text/pdf/languages/IndicLigaturizer.java

 

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2021-07-03, 47960👍, 0💬