1 files changed, 68 insertions, 0 deletions
diff --git a/src/main/java/org/apache/commons/lang3/text/translate/UnicodeUnescaper.java b/src/main/java/org/apache/commons/lang3/text/translate/UnicodeUnescaper.java
new file mode 100644
index 000000000..cb19617e7
--- /dev/null
+++ b/src/main/java/org/apache/commons/lang3/text/translate/UnicodeUnescaper.java
@@ -0,0 +1,68 @@
+/*
+ * 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.commons.lang3.text.translate;
+
+import java.io.IOException;
+import java.io.Writer;
+
+/**
+ * Translates escaped Unicode values of the form \\u+\d\d\d\d back to
+ * Unicode. It supports multiple 'u' characters and will work with or
+ * without the +.
+ *
+ * @since 3.0
+ * @deprecated As of 3.6, use Apache Commons Text
+ * <a href="https://commons.apache.org/proper/commons-text/javadocs/api-release/org/apache/commons/text/translate/UnicodeUnescaper.html">
+ * UnicodeUnescaper</a> instead
+ */
+@Deprecated
+public class UnicodeUnescaper extends CharSequenceTranslator {
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public int translate(final CharSequence input, final int index, final Writer out) throws IOException {
+        if (input.charAt(index) == '\\' && index + 1 < input.length() && input.charAt(index + 1) == 'u') {
+            // consume optional additional 'u' chars
+            int i = 2;
+            while (index + i < input.length() && input.charAt(index + i) == 'u') {
+                i++;
+            }
+
+            if (index + i < input.length() && input.charAt(index + i) == '+') {
+                i++;
+            }
+
+            if (index + i + 4 <= input.length()) {
+                // Get 4 hex digits
+                final CharSequence unicode = input.subSequence(index + i, index + i + 4);
+
+                try {
+                    final int value = Integer.parseInt(unicode.toString(), 16);
+                    out.write((char) value);
+                } catch (final NumberFormatException nfe) {
+                    throw new IllegalArgumentException("Unable to parse unicode value: " + unicode, nfe);
+                }
+                return i + 4;
+            }
+            throw new IllegalArgumentException("Less than 4 hex digits in unicode value: '" + input.subSequence(index, input.length())
+                    + "' due to end of CharSequence");
+        }
+        return 0;
+    }
+}