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/*
*
* This file is part of the iText (R) project.
Copyright (c) 1998-2022 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: [email protected]
*/
package com.itextpdf.text.pdf;
import com.itextpdf.text.SplitCharacter;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
*
* The default class that is used to determine whether or not a character
* is a split character.
*
* You can add an array of characters or a single character on which iText
* should split the chunk. If custom characters have been set, iText will ignore
* the default characters this class uses to split chunks.
*
* @since 2.1.2
*/
public class DefaultSplitCharacter implements SplitCharacter {
private static final Pattern DATE_PATTERN = Pattern.compile("(\\d{2,4}-\\d{2}-\\d{2,4})");
/**
* An instance of the default SplitCharacter.
*/
public static final SplitCharacter DEFAULT = new DefaultSplitCharacter();
protected char[] characters;
/**
* Default constructor, has no custom characters to check.
*/
public DefaultSplitCharacter() {
// empty body
}
/**
* Constructor with one splittable character.
*
* @param character char
*/
public DefaultSplitCharacter(char character) {
this(new char[]{character});
}
/**
* Constructor with an array of splittable characters
*
* @param characters char[]
*/
public DefaultSplitCharacter(char[] characters) {
this.characters = characters;
}
/**
*
* Checks if a character can be used to split a PdfString.
*
*
* The default behavior is that every character less than or equal to SPACE, the character '-'
* and some specific unicode ranges are 'splitCharacters'.
*
*
* If custom splittable characters are set using the specified constructors,
* then this class will ignore the default characters described in the
* previous paragraph.
*
*
* @param start start position in the array
* @param current current position in the array
* @param end end position in the array
* @param ck chunk array
* @param cc the character array that has to be checked
* @return true if the character can be used to split a string, false otherwise
*/
public boolean isSplitCharacter(int start, int current, int end, char[] cc, PdfChunk[] ck) {
char c = getCurrentCharacter(current, cc, ck);
if (c == '-') {
int beginDateidx = Math.max(current - 8, 0);
int dateLength = Math.min(16, cc.length - beginDateidx);
if (containsDate(String.valueOf(cc, beginDateidx, dateLength))) {
return false;
}
}
if (characters != null) {
for (int i = 0; i < characters.length; i++) {
if (c == characters[i]) {
return true;
}
}
return false;
}
if (c <= ' ' || c == '-' || c == '\u2010') {
return true;
}
if (c < 0x2002)
return false;
return ((c >= 0x2002 && c <= 0x200b)
|| (c >= 0x2e80 && c < 0xd7a0)
|| (c >= 0xf900 && c < 0xfb00)
|| (c >= 0xfe30 && c < 0xfe50)
|| (c >= 0xff61 && c < 0xffa0));
}
/**
* Returns the current character
*
* @param current current position in the array
* @param ck chunk array
* @param cc the character array that has to be checked
* @return the current character
*/
protected char getCurrentCharacter(int current, char[] cc, PdfChunk[] ck) {
if (ck == null) {
return cc[current];
}
return (char) ck[Math.min(current, ck.length - 1)].getUnicodeEquivalent(cc[current]);
}
private static boolean containsDate(String data) {
Matcher m = DATE_PATTERN.matcher(data);
return m.find();
}
}