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17 package org.apache.commons.lang3.text.translate;
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19 import java.io.IOException;
20 import java.io.Writer;
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32 @Deprecated
33 public class UnicodeUnescaper extends CharSequenceTranslator {
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38 @Override
39 public int translate(final CharSequence input, final int index, final Writer out) throws IOException {
40 if (input.charAt(index) == '\\' && index + 1 < input.length() && input.charAt(index + 1) == 'u') {
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42 int i = 2;
43 while (index + i < input.length() && input.charAt(index + i) == 'u') {
44 i++;
45 }
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47 if (index + i < input.length() && input.charAt(index + i) == '+') {
48 i++;
49 }
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51 if (index + i + 4 <= input.length()) {
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53 final CharSequence unicode = input.subSequence(index + i, index + i + 4);
54
55 try {
56 final int value = Integer.parseInt(unicode.toString(), 16);
57 out.write((char) value);
58 } catch (final NumberFormatException nfe) {
59 throw new IllegalArgumentException("Unable to parse unicode value: " + unicode, nfe);
60 }
61 return i + 4;
62 }
63 throw new IllegalArgumentException("Less than 4 hex digits in unicode value: '" + input.subSequence(index, input.length())
64 + "' due to end of CharSequence");
65 }
66 return 0;
67 }
68 }