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/* Copyright (C) 1999  Free Software Foundation

   This file is part of libgcj.

This software is copyrighted work licensed under the terms of the

Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for

details.  */

package gnu.gcj.convert;

/**

 * Convert Ascii with \ u XXXX-escapes to Unicode.

 * @author Per Bothner <bothner@cygnus.com>

 * @date April 1999.

 */

public class Input_JavaSrc extends BytesToUnicode

{

  public String getName() { return "JavaSrc"; }

  // 0: normal

  // 1: seen '\\'

  // 2: seen '\\' and 'u'

  // 3: seen '\\' and need to emit value.

  // 4, 5, 6, 7:  seen '\\u', 'u' and (state-3) hex digits.

  int state = 0;

  int value;

  public int read (char[] outbuffer, int outpos, int count)

  {

    int origpos = outpos;

    for (;;)

      {

        if (inpos >= inlength)

          break;

        if (outpos - origpos >= count)

          break;

        char b = (char) (inbuffer[inpos++] & 0xFF);

        switch (state)

          {

          case 0:

            if (b == '\\')

              {

                state = 1;

                continue;

              }

            break;

          case 1:

            if (b == 'u')

              {

                state = 2;

                continue;

              }

            if (b != '\\')

              {

                value = b;

                b = '\\';

                state = 3;

              }

            break;

          case 3:

            b = (char) value;

            break;

          default:  //  case 4:  case 5:  case 6:  case 7:

            int digit = Character.digit(b, 16);

            if (digit < 0)

              {

                b = '\uFFFD';

                state = 0;

              }

            else

              {

                value = value * 16 + digit;

                if (state < 7)

                  {

                    state++;

                    continue;

                  }

                b = (char) value;

              }

            state = 0;

          }

        outbuffer[outpos++] = b;

      }

    return outpos - origpos;

  }

}