ascii_ucodeesc_charstream.java

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     bufline[bufpos] = line;
     bufcolumn[bufpos] = column;
  }

  public final char readChar() throws java.io.IOException
  {
     if (inBuf > 0)
     {
        --inBuf;
        return buffer[(bufpos == bufsize - 1) ? (bufpos = 0) : ++bufpos];
     }

     char c;

     if (++bufpos == available)
        AdjustBuffSize();

     if (((buffer[bufpos] = c = (char)((char)0xff & ReadByte())) == '\\'))
     {
        UpdateLineColumn(c);

        int backSlashCnt = 1;

        for (;;) // Read all the backslashes
        {
           if (++bufpos == available)
              AdjustBuffSize();

           try
           {
              if ((buffer[bufpos] = c = (char)((char)0xff & ReadByte())) != '\\')
              {
                 UpdateLineColumn(c);
                 // found a non-backslash char.
                 if ((c == 'u') && ((backSlashCnt & 1) == 1))
                 {
                    if (--bufpos < 0)
                       bufpos = bufsize - 1;

                    break;
                 }

                 backup(backSlashCnt);
                 return '\\';
              }
           }
           catch(java.io.IOException e)
           {
              if (backSlashCnt > 1)
                 backup(backSlashCnt);

              return '\\';
           }

           UpdateLineColumn(c);
           backSlashCnt++;
        }

        // Here, we have seen an odd number of backslash's followed by a 'u'
        try
        {
           while ((c = (char)((char)0xff & ReadByte())) == 'u')
              ++column;

           buffer[bufpos] = c = (char)(hexval(c) << 12 |
                                       hexval((char)((char)0xff & ReadByte())) << 8 |
                                       hexval((char)((char)0xff & ReadByte())) << 4 |
                                       hexval((char)((char)0xff & ReadByte())));

           column += 4;
        }
        catch(java.io.IOException e)
        {
           throw new Error("Invalid escape character at line " + line +
                                         " column " + column + ".");
        }

        if (backSlashCnt == 1)
           return c;
        else
        {
           backup(backSlashCnt - 1);
           return '\\';
        }
     }
     else
     {
        UpdateLineColumn(c);
        return (c);
     }
  }

  /**
   * @deprecated 
   * @see #getEndColumn
   */

  public final int getColumn() {
     return bufcolumn[bufpos];
  }

  /**
   * @deprecated 
   * @see #getEndLine
   */

  public final int getLine() {
     return bufline[bufpos];
  }

  public final int getEndColumn() {
     return bufcolumn[bufpos];
  }

  public final int getEndLine() {
     return bufline[bufpos];
  }

  public final int getBeginColumn() {
     return bufcolumn[tokenBegin];
  }

  public final int getBeginLine() {
     return bufline[tokenBegin];
  }

  public final void backup(int amount) {

    inBuf += amount;
    if ((bufpos -= amount) < 0)
       bufpos += bufsize;
  }

  public ASCII_UCodeESC_CharStream(java.io.Reader dstream,
                 int startline, int startcolumn, int buffersize)
  {
    inputStream = dstream;
    line = startline;
    column = startcolumn - 1;

    available = bufsize = buffersize;
    buffer = new char[buffersize];
    bufline = new int[buffersize];
    bufcolumn = new int[buffersize];
    nextCharBuf = new char[4096];
  }

  public ASCII_UCodeESC_CharStream(java.io.Reader dstream,
                                        int startline, int startcolumn)
  {
     this(dstream, startline, startcolumn, 4096);
  }
  public void ReInit(java.io.Reader dstream,
                 int startline, int startcolumn, int buffersize)
  {
    inputStream = dstream;
    line = startline;
    column = startcolumn - 1;

    if (buffer == null || buffersize != buffer.length)
    {
      available = bufsize = buffersize;
      buffer = new char[buffersize];
      bufline = new int[buffersize];
      bufcolumn = new int[buffersize];
      nextCharBuf = new char[4096];
    }
    prevCharIsLF = prevCharIsCR = false;
    tokenBegin = inBuf = maxNextCharInd = 0;
    nextCharInd = bufpos = -1;
  }

  public void ReInit(java.io.Reader dstream,
                                        int startline, int startcolumn)
  {
     ReInit(dstream, startline, startcolumn, 4096);
  }
  public ASCII_UCodeESC_CharStream(java.io.InputStream dstream, int startline,
  int startcolumn, int buffersize)
  {
     this(new java.io.InputStreamReader(dstream), startline, startcolumn, 4096);
  }

  public ASCII_UCodeESC_CharStream(java.io.InputStream dstream, int startline,
                                                           int startcolumn)
  {
     this(dstream, startline, startcolumn, 4096);
  }

  public void ReInit(java.io.InputStream dstream, int startline,
  int startcolumn, int buffersize)
  {
     ReInit(new java.io.InputStreamReader(dstream), startline, startcolumn, 4096);
  }
  public void ReInit(java.io.InputStream dstream, int startline,
                                                           int startcolumn)
  {
     ReInit(dstream, startline, startcolumn, 4096);
  }

  public final String GetImage()
  {
     if (bufpos >= tokenBegin)
        return new String(buffer, tokenBegin, bufpos - tokenBegin + 1);
     else
        return new String(buffer, tokenBegin, bufsize - tokenBegin) +
                              new String(buffer, 0, bufpos + 1);
  }

  public final char[] GetSuffix(int len)
  {
     char[] ret = new char[len];

     if ((bufpos + 1) >= len)
        System.arraycopy(buffer, bufpos - len + 1, ret, 0, len);
     else
     {
        System.arraycopy(buffer, bufsize - (len - bufpos - 1), ret, 0,
                                                          len - bufpos - 1);
        System.arraycopy(buffer, 0, ret, len - bufpos - 1, bufpos + 1);
     }

     return ret;
  }

  public void Done()
  {
     nextCharBuf = null;
     buffer = null;
     bufline = null;
     bufcolumn = null;
  }

  /**
   * Method to adjust line and column numbers for the start of a token.<BR>
   */
  public void adjustBeginLineColumn(int newLine, int newCol)
  {
     int start = tokenBegin;
     int len;

     if (bufpos >= tokenBegin)
     {
        len = bufpos - tokenBegin + inBuf + 1;
     }
     else
     {
        len = bufsize - tokenBegin + bufpos + 1 + inBuf;
     }

     int i = 0, j = 0, k = 0;
     int nextColDiff = 0, columnDiff = 0;

     while (i < len &&
            bufline[j = start % bufsize] == bufline[k = ++start % bufsize])
     {
        bufline[j] = newLine;
        nextColDiff = columnDiff + bufcolumn[k] - bufcolumn[j];
        bufcolumn[j] = newCol + columnDiff;
        columnDiff = nextColDiff;
        i++;
     } 

     if (i < len)
     {
        bufline[j] = newLine++;
        bufcolumn[j] = newCol + columnDiff;

        while (i++ < len)
        {
           if (bufline[j = start % bufsize] != bufline[++start % bufsize])
              bufline[j] = newLine++;
           else
              bufline[j] = newLine;
        }
     }

     line = bufline[j];
     column = bufcolumn[j];
  }

}