Coverage Report - org.apache.commons.lang3.text.translate.UnicodeUnescaper
 
Classes in this File Line Coverage Branch Coverage Complexity
UnicodeUnescaper
100%
17/17
87%
14/16
13
 
 1  
 /*
 2  
  * Licensed to the Apache Software Foundation (ASF) under one or more
 3  
  * contributor license agreements.  See the NOTICE file distributed with
 4  
  * this work for additional information regarding copyright ownership.
 5  
  * The ASF licenses this file to You under the Apache License, Version 2.0
 6  
  * (the "License"); you may not use this file except in compliance with
 7  
  * the License.  You may obtain a copy of the License at
 8  
  * 
 9  
  *      http://www.apache.org/licenses/LICENSE-2.0
 10  
  * 
 11  
  * Unless required by applicable law or agreed to in writing, software
 12  
  * distributed under the License is distributed on an "AS IS" BASIS,
 13  
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 14  
  * See the License for the specific language governing permissions and
 15  
  * limitations under the License.
 16  
  */
 17  
 package org.apache.commons.lang3.text.translate;
 18  
 
 19  
 import java.io.IOException;
 20  
 import java.io.Writer;
 21  
 
 22  
 /**
 23  
  * Translates escaped Unicode values of the form \\u+\d\d\d\d back to 
 24  
  * Unicode. It supports multiple 'u' characters and will work with or 
 25  
  * without the +.
 26  
  * 
 27  
  * @since 3.0
 28  
  */
 29  4
 public class UnicodeUnescaper extends CharSequenceTranslator {
 30  
 
 31  
     /**
 32  
      * {@inheritDoc}
 33  
      */
 34  
     @Override
 35  
     public int translate(final CharSequence input, final int index, final Writer out) throws IOException {
 36  89
         if (input.charAt(index) == '\\' && index + 1 < input.length() && input.charAt(index + 1) == 'u') {
 37  
             // consume optional additional 'u' chars
 38  16
             int i = 2;
 39  23
             while (index + i < input.length() && input.charAt(index + i) == 'u') {
 40  7
                 i++;
 41  
             }
 42  
 
 43  16
             if (index + i < input.length() && input.charAt(index + i) == '+') {
 44  1
                 i++;
 45  
             }
 46  
 
 47  16
             if (index + i + 4 <= input.length()) {
 48  
                 // Get 4 hex digits
 49  15
                 final CharSequence unicode = input.subSequence(index + i, index + i + 4);
 50  
 
 51  
                 try {
 52  15
                     final int value = Integer.parseInt(unicode.toString(), 16);
 53  14
                     out.write((char) value);
 54  1
                 } catch (final NumberFormatException nfe) {
 55  1
                     throw new IllegalArgumentException("Unable to parse unicode value: " + unicode, nfe);
 56  14
                 }
 57  14
                 return i + 4;
 58  
             }
 59  1
             throw new IllegalArgumentException("Less than 4 hex digits in unicode value: '" + input.subSequence(index, input.length())
 60  
                     + "' due to end of CharSequence");
 61  
         }
 62  73
         return 0;
 63  
     }
 64  
 }