/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
*/
package org.apache.pdfbox.util;
import com.ibm.icu.text.Bidi;
import com.ibm.icu.text.Normalizer;
/**
* This class is an implementation the the ICU4J class. TextNormalize
* will call this only if the ICU4J library exists in the classpath.
* @author <a href="mailto:carrier@digital-evidence.org">Brian Carrier</a>
* @version $Revision: 1.0 $
*/
public class ICU4JImpl
{
Bidi bidi;
/**
* Constructor.
*/
public ICU4JImpl()
{
bidi = new Bidi();
/* We do not use bidi.setInverse() because that uses
* Bidi.REORDER_INVERSE_NUMBERS_AS_L, which caused problems
* in some test files. For example, a file had a line of:
* 0 1 / ARABIC
* and the 0 and 1 were reversed in the end result.
* REORDER_INVERSE_LIKE_DIRECT is the inverse Bidi mode
* that more closely reflects the Unicode spec.
*/
bidi.setReorderingMode(Bidi.REORDER_INVERSE_LIKE_DIRECT);
}
/**
* Takes a line of text in presentation order and converts it to logical order.
* @see TextNormalize#makeLineLogicalOrder(String, boolean)
*
* @param str String to convert
* @param isRtlDominant RTL (right-to-left) will be the dominant text direction
* @return The converted string
*/
public String makeLineLogicalOrder(String str, boolean isRtlDominant)
{
bidi.setPara(str, isRtlDominant?Bidi.RTL:Bidi.LTR, null);
/* Set the mirror flag so that parentheses and other mirror symbols
* are properly reversed, when needed. With this removed, lines
* such as (CBA) in the PDF file will come out like )ABC( in logical
* order.
*/
return bidi.writeReordered(Bidi.DO_MIRRORING);
}
/**
* Normalize presentation forms of characters to the separate parts.
* @see TextNormalize#normalizePres(String)
*
* @param str String to normalize
* @return Normalized form
*/
public String normalizePres(String str)
{
StringBuilder builder = null;
int p = 0;
int q = 0;
int strLength = str.length();
for (; q < strLength; q++)
{
// We only normalize if the codepoint is in a given range.
// Otherwise, NFKC converts too many things that would cause
// confusion. For example, it converts the micro symbol in
// extended Latin to the value in the Greek script. We normalize
// the Unicode Alphabetic and Arabic A&B Presentation forms.
char c = str.charAt(q);
if ((0xFB00 <= c && c <= 0xFDFF) || (0xFE70 <= c && c <= 0xFEFF))
{
if (builder == null)
{
builder = new StringBuilder(strLength * 2);
}
builder.append(str.substring(p, q));
// Some fonts map U+FDF2 differently than the Unicode spec.
// They add an extra U+0627 character to compensate.
// This removes the extra character for those fonts.
if(c == 0xFDF2 && q > 0 && (str.charAt(q-1) == 0x0627 || str.charAt(q-1) == 0xFE8D))
{
builder.append("\u0644\u0644\u0647");
}
else
{
// Trim because some decompositions have an extra space,
// such as U+FC5E
builder.append(
Normalizer.normalize(c, Normalizer.NFKC).trim());
}
p = q + 1;
}
}
if (builder == null)
{
return str;
}
else
{
builder.append(str.substring(p, q));
return builder.toString();
}
}
/**
* Decomposes Diacritic characters to their combining forms.
*
* @param str String to be Normalized
* @return A Normalized String
*/
public String normalizeDiac(String str)
{
StringBuilder retStr = new StringBuilder();
int strLength = str.length();
for (int i = 0; i < strLength; i++)
{
char c = str.charAt(i);
int type = Character.getType(c);
if(type == Character.NON_SPACING_MARK
|| type == Character.MODIFIER_SYMBOL
|| type == Character.MODIFIER_LETTER)
{
/*
* Trim because some decompositions have an extra space, such as
* U+00B4
*/
retStr.append(Normalizer.normalize(c, Normalizer.NFKC).trim());
}
else
{
retStr.append(str.charAt(i));
}
}
return retStr.toString();
}
}