/* The following code was generated by JFlex 1.3.5 on 8/30/02 3:00 PM */

/*
 *                 Sun Public License Notice
 * 
 * The contents of this file are subject to the Sun Public License
 * Version 1.0 (the "License"). You may not use this file except in
 * compliance with the License. A copy of the License is available at
 * http://www.sun.com/
 * 
 * The Original Code is NetBeans. The Initial Developer of the Original
 * Code is Sun Microsystems, Inc. Portions Copyright 1997-2002 Sun
 * Microsystems, Inc. All Rights Reserved.
 */

package org.netbeans.lib.java.parser;

import java.io.*;
import java.util.ArrayList;


/**
 * This class is a scanner generated by 
 * JFlex 1.3.5
 * on 8/30/02 3:00 PM from the specification file
 * file:/home/th125165/Projects/Source/netbeans-cvs/nb_all/java_meta_2/libsrc/org/netbeans/lib/java/parser/unicode.l
 */
final class UnicodeEscapes extends FilterReader {

  /** This character denotes the end of file */
  final public static int YYEOF = -1;

  /** initial size of the lookahead buffer */
  final private static int YY_BUFFERSIZE = 16384;

  /** lexical states */
  final public static int DIGITS = 1;
  final public static int YYINITIAL = 0;

  /** 
   * Translates characters to character classes
   */
  final private static String yycmap_packed = 
    "\12\0\1\0\45\0\12\1\7\0\6\1\25\0\1\2\4\0\6\1"+
    "\16\0\1\3\uff8a\0";

  /** 
   * Translates characters to character classes
   */
  final private static char [] yycmap = yy_unpack_cmap(yycmap_packed);


  /* error codes */
  final private static int YY_UNKNOWN_ERROR = 0;
  final private static int YY_ILLEGAL_STATE = 1;
  final private static int YY_NO_MATCH = 2;
  final private static int YY_PUSHBACK_2BIG = 3;

  /* error messages for the codes above */
  final private static String YY_ERROR_MSG[] = {
    "Unkown internal scanner error",
    "Internal error: unknown state",
    "Error: could not match input",
    "Error: pushback value was too large"
  };

  /** the input device */
  private java.io.Reader yy_reader;

  /** the current state of the DFA */
  private int yy_state;

  /** the current lexical state */
  private int yy_lexical_state = YYINITIAL;

  /** this buffer contains the current text to be matched and is
      the source of the yytext() string */
  private char yy_buffer[] = new char[YY_BUFFERSIZE];

  /** the textposition at the last accepting state */
  private int yy_markedPos;

  /** the textposition at the last state to be included in yytext */
  private int yy_pushbackPos;

  /** the current text position in the buffer */
  private int yy_currentPos;

  /** startRead marks the beginning of the yytext() string in the buffer */
  private int yy_startRead;

  /** endRead marks the last character in the buffer, that has been read
      from input */
  private int yy_endRead;

  /** number of newlines encountered up to the start of the matched text */
  private int yyline;

  /** the number of characters up to the start of the matched text */
  private int yychar;

  /**
   * the number of characters from the last newline up to the start of the 
   * matched text
   */
  private int yycolumn; 

  /** 
   * yy_atBOL == true <=> the scanner is currently at the beginning of a line
   */
  private boolean yy_atBOL = true;

  /** yy_atEOF == true <=> the scanner is at the EOF */
  private boolean yy_atEOF;

  /* user code: */
    private char lastToken[]=null;

    private int escapeOffset = 0;
    private ArrayList escapes = new ArrayList(); 
    private int escapesIndex = -1;
    private int nextEscapePosition = -1;
    private int currentEscapeDispl = 0;

    private char value() {
        char r=0;
        String token = yytext();

        for (int k = token.length()-4; k < token.length(); k++) {
            int c = token.charAt(k);
            if (c >= 'a') 
                c-= 'a'-10;
            else if (c >= 'A')
                c-= 'A'-10;
            else
                c-= '0';
            r <<= 4;
            r += c;
	    }
        return r;
    }

    int convertPosition(int position) {
        if (escapes.isEmpty())
            return position;
        for (;;) {
            if (position <= nextEscapePosition)
                return position+currentEscapeDispl;
            if (nextEscapePosition != -1)
                currentEscapeDispl=((Integer)escapes.get(++escapesIndex)).intValue();
            if (escapes.size()<=escapesIndex+1) {
                nextEscapePosition = -1;
                return position+currentEscapeDispl;
            }
            nextEscapePosition=((Integer)escapes.get(++escapesIndex)).intValue();
        }        
    }

    public int read(char cbuf[], int off, int len) throws IOException {
        int tokenLen;

//        if ( !ready() ) return -1;
        if (lastToken==null) {    
            lastToken = yylex();
        }
        tokenLen = lastToken.length;
        if (tokenLen==0)
            return -1;
        if (len>=tokenLen) {
            System.arraycopy(lastToken,0,cbuf,off,tokenLen);
            lastToken=null;
            return tokenLen;
        }
        char token[]=new char[lastToken.length-len];
        System.arraycopy(lastToken,0,cbuf,off,len);
        System.arraycopy(lastToken,len,token,0,token.length);
        lastToken=token;
        return len;
    }

    public boolean markSupported() { 
        return false; 
    }

    public boolean ready() throws IOException {
        return lastToken!=null || (!yy_atEOF && (yy_currentPos < yy_endRead || yy_reader.ready()));
    }



  /**
   * Creates a new scanner
   * There is also a java.io.InputStream version of this constructor.
   *
   * @param   in  the java.io.Reader to read input from.
   */
  UnicodeEscapes(java.io.Reader in) {
    super(in);
    this.yy_reader = in;
  }

  /**
   * Creates a new scanner.
   * There is also java.io.Reader version of this constructor.
   *
   * @param   in  the java.io.Inputstream to read input from.
   */
  UnicodeEscapes(java.io.InputStream in) {
    this(new java.io.InputStreamReader(in));
  }

  /** 
   * Unpacks the compressed character translation table.
   *
   * @param packed   the packed character translation table
   * @return         the unpacked character translation table
   */
  private static char [] yy_unpack_cmap(String packed) {
    char [] map = new char[0x10000];
    int i = 0;  /* index in packed string  */
    int j = 0;  /* index in unpacked array */
    while (i < 26) {
      int  count = packed.charAt(i++);
      char value = packed.charAt(i++);
      do map[j++] = value; while (--count > 0);
    }
    return map;
  }


  /**
   * Refills the input buffer.
   *
   * @return      false, iff there was new input.
   * 
   * @exception   IOException  if any I/O-Error occurs
   */
  private boolean yy_refill() throws java.io.IOException {

    /* first: make room (if you can) */
    if (yy_startRead > 0) {
      System.arraycopy(yy_buffer, yy_startRead, 
                       yy_buffer, 0, 
                       yy_endRead-yy_startRead);

      /* translate stored positions */
      yy_endRead-= yy_startRead;
      yy_currentPos-= yy_startRead;
      yy_markedPos-= yy_startRead;
      yy_pushbackPos-= yy_startRead;
      yy_startRead = 0;
    }

    /* is the buffer big enough? */
    if (yy_currentPos >= yy_buffer.length) {
      /* if not: blow it up */
      char newBuffer[] = new char[yy_currentPos*2];
      System.arraycopy(yy_buffer, 0, newBuffer, 0, yy_buffer.length);
      yy_buffer = newBuffer;
    }

    /* finally: fill the buffer with new input */
    int numRead = yy_reader.read(yy_buffer, yy_endRead, 
                                            yy_buffer.length-yy_endRead);

    if (numRead < 0) {
      return true;
    }
    else {
      yy_endRead+= numRead;  
      return false;
    }
  }


  /**
   * Closes the input stream.
   */
  final public void yyclose() throws java.io.IOException {
    yy_atEOF = true;            /* indicate end of file */
    yy_endRead = yy_startRead;  /* invalidate buffer    */

    if (yy_reader != null)
      yy_reader.close();
  }


  /**
   * Closes the current stream, and resets the
   * scanner to read from a new input stream.
   *
   * All internal variables are reset, the old input stream 
   * cannot be reused (internal buffer is discarded and lost).
   * Lexical state is set to YY_INITIAL.
   *
   * @param reader   the new input stream 
   */
  final public void yyreset(java.io.Reader reader) throws java.io.IOException {
    yyclose();
    yy_reader = reader;
    yy_atBOL  = true;
    yy_atEOF  = false;
    yy_endRead = yy_startRead = 0;
    yy_currentPos = yy_markedPos = yy_pushbackPos = 0;
    yyline = yychar = yycolumn = 0;
    yy_lexical_state = YYINITIAL;
  }


  /**
   * Returns the current lexical state.
   */
  final public int yystate() {
    return yy_lexical_state;
  }


  /**
   * Enters a new lexical state
   *
   * @param newState the new lexical state
   */
  final public void yybegin(int newState) {
    yy_lexical_state = newState;
  }


  /**
   * Returns the text matched by the current regular expression.
   */
  final public String yytext() {
    return new String( yy_buffer, yy_startRead, yy_markedPos-yy_startRead );
  }


  /**
   * Returns the character at position pos from the 
   * matched text. 
   * 
   * It is equivalent to yytext().charAt(pos), but faster
   *
   * @param pos the position of the character to fetch. 
   *            A value from 0 to yylength()-1.
   *
   * @return the character at position pos
   */
  final public char yycharat(int pos) {
    return yy_buffer[yy_startRead+pos];
  }


  /**
   * Returns the length of the matched text region.
   */
  final public int yylength() {
    return yy_markedPos-yy_startRead;
  }


  /**
   * Reports an error that occured while scanning.
   *
   * In a wellformed scanner (no or only correct usage of 
   * yypushback(int) and a match-all fallback rule) this method 
   * will only be called with things that "Can't Possibly Happen".
   * If this method is called, something is seriously wrong
   * (e.g. a JFlex bug producing a faulty scanner etc.).
   *
   * Usual syntax/scanner level error handling should be done
   * in error fallback rules.
   *
   * @param   errorCode  the code of the errormessage to display
   */
  private void yy_ScanError(int errorCode) {
    String message;
    try {
      message = YY_ERROR_MSG[errorCode];
    }
    catch (ArrayIndexOutOfBoundsException e) {
      message = YY_ERROR_MSG[YY_UNKNOWN_ERROR];
    }

    throw new Error(message);
  } 


  /**
   * Pushes the specified amount of characters back into the input stream.
   *
   * They will be read again by then next call of the scanning method
   *
   * @param number  the number of characters to be read again.
   *                This number must not be greater than yylength()!
   */
  private void yypushback(int number)  {
    if ( number > yylength() )
      yy_ScanError(YY_PUSHBACK_2BIG);

    yy_markedPos -= number;
  }


  /**
   * Resumes scanning until the next regular expression is matched,
   * the end of input is encountered or an I/O-Error occurs.
   *
   * @return      the next token
   * @exception   IOException  if any I/O-Error occurs
   */
  public char[] yylex() throws java.io.IOException {
    int yy_input;
    int yy_action;

    // cached fields:
    int yy_currentPos_l;
    int yy_startRead_l;
    int yy_markedPos_l;
    int yy_endRead_l = yy_endRead;
    char [] yy_buffer_l = yy_buffer;
    char [] yycmap_l = yycmap;


    while (true) {
      yy_markedPos_l = yy_markedPos;

      yychar+= yy_markedPos_l-yy_startRead;

      yy_action = -1;

      yy_startRead_l = yy_currentPos_l = yy_currentPos = 
                       yy_startRead = yy_markedPos_l;

      yy_state = yy_lexical_state;


      yy_forAction: {
        while (true) {

          if (yy_currentPos_l < yy_endRead_l)
            yy_input = yy_buffer_l[yy_currentPos_l++];
          else if (yy_atEOF) {
            yy_input = YYEOF;
            break yy_forAction;
          }
          else {
            // store back cached positions
            yy_currentPos  = yy_currentPos_l;
            yy_markedPos   = yy_markedPos_l;
            boolean eof = yy_refill();
            // get translated positions and possibly new buffer
            yy_currentPos_l  = yy_currentPos;
            yy_markedPos_l   = yy_markedPos;
            yy_buffer_l      = yy_buffer;
            yy_endRead_l     = yy_endRead;
            if (eof) {
              yy_input = YYEOF;
              break yy_forAction;
            }
            else {
              yy_input = yy_buffer_l[yy_currentPos_l++];
            }
          }
          yy_input = yycmap_l[yy_input];

          boolean yy_isFinal = false;
          boolean yy_noLookAhead = false;

          yy_forNext: { switch (yy_state) {
            case 0:
              switch (yy_input) {
                case 2: yy_isFinal = true; yy_state = 3; break yy_forNext;
                default: yy_isFinal = true; yy_state = 2; break yy_forNext;
              }

            case 1:
              switch (yy_input) {
                case 1: yy_isFinal = true; yy_state = 5; break yy_forNext;
                case 3: yy_isFinal = true; yy_state = 6; break yy_forNext;
                default: yy_isFinal = true; yy_noLookAhead = true; yy_state = 4; break yy_forNext;
              }

            case 2:
              switch (yy_input) {
                case 2: break yy_forAction;
                default: yy_isFinal = true; yy_state = 2; break yy_forNext;
              }

            case 3:
              switch (yy_input) {
                case 2: yy_isFinal = true; yy_state = 7; break yy_forNext;
                case 3: yy_isFinal = true; yy_noLookAhead = true; yy_state = 8; break yy_forNext;
                default: break yy_forAction;
              }

            case 5:
              switch (yy_input) {
                case 1: yy_state = 9; break yy_forNext;
                default: break yy_forAction;
              }

            case 6:
              switch (yy_input) {
                case 1: yy_state = 10; break yy_forNext;
                case 3: yy_state = 11; break yy_forNext;
                default: break yy_forAction;
              }

            case 7:
              switch (yy_input) {
                case 2: yy_isFinal = true; yy_state = 3; break yy_forNext;
                default: break yy_forAction;
              }

            case 9:
              switch (yy_input) {
                case 1: yy_state = 12; break yy_forNext;
                default: break yy_forAction;
              }

            case 10:
              switch (yy_input) {
                case 1: yy_state = 9; break yy_forNext;
                default: break yy_forAction;
              }

            case 11:
              switch (yy_input) {
                case 1: yy_state = 10; break yy_forNext;
                case 3: yy_state = 11; break yy_forNext;
                default: break yy_forAction;
              }

            case 12:
              switch (yy_input) {
                case 1: yy_isFinal = true; yy_noLookAhead = true; yy_state = 13; break yy_forNext;
                default: break yy_forAction;
              }

            default:
              yy_ScanError(YY_ILLEGAL_STATE);
              break;
          } }

          if ( yy_isFinal ) {
            yy_action = yy_state; 
            yy_markedPos_l = yy_currentPos_l; 
            if ( yy_noLookAhead ) break yy_forAction;
          }

        }
      }

      // store back cached position
      yy_markedPos = yy_markedPos_l;

      switch (yy_action) {

        case 13: 
          {  yybegin(YYINITIAL);
                       escapeOffset+=yylength()-1;
                       escapes.add(new Integer(escapeOffset));
                       return new char[]{value()};
                      }
        case 15: break;
        case 4: 
        case 5: 
        case 6: 
          {  throw new Error("incorrect Unicode escape");  }
        case 16: break;
        case 8: 
          {  yybegin(DIGITS); 
                  escapes.add(new Integer(yychar-escapeOffset));
                  escapeOffset+=yylength();
                 }
        case 17: break;
        case 3: 
        case 7: 
          {  return yytext().toCharArray();  }
        case 18: break;
        case 2: 
          {  return yytext().toCharArray();  }
        case 19: break;
        default: 
          if (yy_input == YYEOF && yy_startRead == yy_currentPos) {
            yy_atEOF = true;
            switch (yy_lexical_state) {
            case DIGITS:
              {  throw new Error("EOF in Unicode escape");  }
            case 15: break;
            case YYINITIAL:
              {  return new char[0];  }
            case 16: break;
            default:
            return null;
            }
          } 
          else {
            yy_ScanError(YY_NO_MATCH);
          }
      }
    }
  }


}