package emissary.transform.decode;
   
   import emissary.util.shell.Executrix;
   
   import java.io.ByteArrayOutputStream;
   import java.io.IOException;
   
   @Deprecated
   public class JavascriptEscape {
  
      /**
       * Unescape javascript unicode characters in the form backslash-u-nnnn. Browser tests show that only lowercase "u" and
       * only four digits work. Javascript also has normal unix escapes like \n and \r.
       */
      public static byte[] unescape(byte[] data) {
          ByteArrayOutputStream out = new ByteArrayOutputStream();
          for (int i = 0; i < data.length; i++) {
              if (data[i] == '\\' && (i + 5) < data.length && data[i + 1] == 'u') {
                  // process unicode escape
                  try {
                      String s = new String(data, i + 2, 4);
                      char[] c = HtmlEscape.unescapeHtmlChar(s, true);
                      if (c != null && c.length > 0) {
                          out.write(new String(c).getBytes());
                          // logger.debug("Unicode '{}' ==> '{}'", s, new String(c));
                          i += 5;
                      } else {
                          out.write(data[i]);
                      }
                  } catch (IOException iox) {
                      out.write(data[i]);
                  }
              } else if (data[i] == '\\' && (i + 1) < data.length && (data[i + 1] == 'n' || data[i + 1] == 'r')) {
                  out.write('\n');
              } else {
                  out.write(data[i]);
              }
          }
  
          return out.toByteArray();
      }
  
      /** This class is not meant to be instantiated. */
      private JavascriptEscape() {}
  
      @SuppressWarnings("SystemOut")
      public static void main(String[] args) {
          int i = 0;
  
          for (; i < args.length; i++) {
              byte[] content = Executrix.readDataFromFile(args[i]);
              if (content == null) {
                  System.out.println(args[i] + ": Unreadable");
                  continue;
              }
  
              System.out.println(args[i]);
              byte[] escaped = JavascriptEscape.unescape(content);
              System.out.write(escaped, 0, escaped.length);
              System.out.println();
          }
      }
  }