/*
*
* This file is part of the iText (R) project.
Copyright (c) 1998-2017 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.pdf;
import com.itextpdf.text.Chunk;
import com.itextpdf.text.Font;
import com.itextpdf.text.Phrase;
import com.itextpdf.text.Utilities;
import com.itextpdf.text.error_messages.MessageLocalization;
import java.util.ArrayList;
/** Selects the appropriate fonts that contain the glyphs needed to
* render text correctly. The fonts are checked in order until the
* character is found.
* <p>
* The built in fonts "Symbol" and "ZapfDingbats", if used, have a special encoding
* to allow the characters to be referred by Unicode.
* @author Paulo Soares
*/
public class FontSelector {
protected ArrayList<Font> fonts = new ArrayList<Font>();
protected Font currentFont = null;
/**
* Adds a <CODE>Font</CODE> to be searched for valid characters.
* @param font the <CODE>Font</CODE>
*/
public void addFont(Font font) {
if (font.getBaseFont() != null) {
fonts.add(font);
return;
}
BaseFont bf = font.getCalculatedBaseFont(true);
Font f2 = new Font(bf, font.getSize(), font.getCalculatedStyle(), font.getColor());
fonts.add(f2);
}
/**
* Process the text so that it will render with a combination of fonts
* if needed.
* @param text the text
* @return a <CODE>Phrase</CODE> with one or more chunks
*/
public Phrase process(String text) {
if (fonts.size() == 0)
throw new IndexOutOfBoundsException(MessageLocalization.getComposedMessage("no.font.is.defined"));
char cc[] = text.toCharArray();
int len = cc.length;
StringBuffer sb = new StringBuffer();
Phrase ret = new Phrase();
currentFont = null;
for (int k = 0; k < len; ++k) {
Chunk newChunk = processChar(cc, k, sb);
if (newChunk != null) {
ret.add(newChunk);
}
}
if (sb.length() > 0) {
Chunk ck = new Chunk(sb.toString(), currentFont != null ? currentFont : fonts.get(0));
ret.add(ck);
}
return ret;
}
protected Chunk processChar(char[] cc, int k, StringBuffer sb) {
Chunk newChunk = null;
char c = cc[k];
if (c == '\n' || c == '\r') {
sb.append(c);
} else {
Font font = null;
if (Utilities.isSurrogatePair(cc, k)) {
int u = Utilities.convertToUtf32(cc, k);
for (int f = 0; f < fonts.size(); ++f) {
font = fonts.get(f);
if (font.getBaseFont().charExists(u) || Character.getType(u) == Character.FORMAT) {
if (currentFont != font) {
if (sb.length() > 0 && currentFont != null) {
newChunk = new Chunk(sb.toString(), currentFont);
sb.setLength(0);
}
currentFont = font;
}
sb.append(c);
sb.append(cc[++k]);
break;
}
}
} else {
for (int f = 0; f < fonts.size(); ++f) {
font = fonts.get(f);
if (font.getBaseFont().charExists(c) || Character.getType(c) == Character.FORMAT) {
if (currentFont != font) {
if (sb.length() > 0 && currentFont != null) {
newChunk = new Chunk(sb.toString(), currentFont);
sb.setLength(0);
}
currentFont = font;
}
sb.append(c);
break;
}
}
}
}
return newChunk;
}
}