javascanner.java

JDK1.4编译器后端

   * All internal variables are reset, the old input stream 
   * <b>cannot</b> be reused (internal buffer is discarded and lost).
   * Lexical state is set to <tt>ZZ_INITIAL</tt>.
   *
   * @param reader   the new input stream 
   */
  public final void yyreset(java.io.Reader reader) {
    zzReader = reader;
    zzAtBOL  = true;
    zzAtEOF  = false;
    zzEndRead = zzStartRead = 0;
    zzCurrentPos = zzMarkedPos = zzPushbackPos = 0;
    yyline = yychar = yycolumn = 0;
    zzLexicalState = YYINITIAL;
  }


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


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


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


  /**
   * Returns the character at position <tt>pos</tt> 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
   */
  public final char yycharat(int pos) {
    return zzBuffer[zzStartRead+pos];
  }


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


  /**
   * 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 zzScanError(int errorCode) {
    String message;
    try {
      message = ZZ_ERROR_MSG[errorCode];
    }
    catch (ArrayIndexOutOfBoundsException e) {
      message = ZZ_ERROR_MSG[ZZ_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()!
   */
  public void yypushback(int number)  {
    if ( number > yylength() )
      zzScanError(ZZ_PUSHBACK_2BIG);

    zzMarkedPos -= 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   java.io.IOException  if any I/O-Error occurs
   */
  public Symbol nextToken() throws java.io.IOException, Scanner.Exception {
    int zzInput;
    int zzAction;

    // cached fields:
    int zzCurrentPosL;
    int zzMarkedPosL;
    int zzEndReadL = zzEndRead;
    char [] zzBufferL = zzBuffer;
    char [] zzCMapL = ZZ_CMAP;

    int [] zzTransL = ZZ_TRANS;
    int [] zzRowMapL = ZZ_ROWMAP;
    int [] zzAttrL = ZZ_ATTRIBUTE;

    while (true) {
      zzMarkedPosL = zzMarkedPos;

      boolean zzR = false;
      for (zzCurrentPosL = zzStartRead; zzCurrentPosL < zzMarkedPosL;
                                                             zzCurrentPosL++) {
        switch (zzBufferL[zzCurrentPosL]) {
        case '\u000B':
        case '\u000C':
        case '\u0085':
        case '\u2028':
        case '\u2029':
          yyline++;
          yycolumn = 0;
          zzR = false;
          break;
        case '\r':
          yyline++;
          yycolumn = 0;
          zzR = true;
          break;
        case '\n':
          if (zzR)
            zzR = false;
          else {
            yyline++;
            yycolumn = 0;
          }
          break;
        default:
          zzR = false;
          yycolumn++;
        }
      }

      if (zzR) {
        // peek one character ahead if it is \n (if we have counted one line too much)
        boolean zzPeek;
        if (zzMarkedPosL < zzEndReadL)
          zzPeek = zzBufferL[zzMarkedPosL] == '\n';
        else if (zzAtEOF)
          zzPeek = false;
        else {
          boolean eof = zzRefill();
          zzMarkedPosL = zzMarkedPos;
          zzBufferL = zzBuffer;
          if (eof) 
            zzPeek = false;
          else 
            zzPeek = zzBufferL[zzMarkedPosL] == '\n';
        }
        if (zzPeek) yyline--;
      }
      zzAction = -1;

      zzCurrentPosL = zzCurrentPos = zzStartRead = zzMarkedPosL;
  
      zzState = zzLexicalState;


      zzForAction: {
        while (true) {
    
          if (zzCurrentPosL < zzEndReadL)
            zzInput = zzBufferL[zzCurrentPosL++];
          else if (zzAtEOF) {
            zzInput = YYEOF;
            break zzForAction;
          }
          else {
            // store back cached positions
            zzCurrentPos  = zzCurrentPosL;
            zzMarkedPos   = zzMarkedPosL;
            boolean eof = zzRefill();
            // get translated positions and possibly new buffer
            zzCurrentPosL  = zzCurrentPos;
            zzMarkedPosL   = zzMarkedPos;
            zzBufferL      = zzBuffer;
            zzEndReadL     = zzEndRead;
            if (eof) {
              zzInput = YYEOF;
              break zzForAction;
            }
            else {
              zzInput = zzBufferL[zzCurrentPosL++];
            }
          }
          int zzNext = zzTransL[ zzRowMapL[zzState] + zzCMapL[zzInput] ];
          if (zzNext == -1) break zzForAction;
          zzState = zzNext;

          int zzAttributes = zzAttrL[zzState];
          if ( (zzAttributes & 1) == 1 ) {
            zzAction = zzState;
            zzMarkedPosL = zzCurrentPosL;
            if ( (zzAttributes & 8) == 8 ) break zzForAction;
          }

        }
      }

      // store back cached position
      zzMarkedPos = zzMarkedPosL;

      switch (zzAction < 0 ? zzAction : ZZ_ACTION[zzAction]) {
        case 48: 
          { return sym(Terminals.LTEQ);
          }
        case 132: break;
        case 38: 
          { return sym(Terminals.DOUBLE_LITERAL, str().substring(0,len()-1));
          }
        case 133: break;
        case 73: 
          { return sym(Terminals.INT);
          }
        case 134: break;
        case 69: 
          { return sym(Terminals.LONG_LITERAL, str().substring(0, len()-1));
          }
        case 135: break;
        case 42: 
          { error("unterminated character literal at end of line");
          }
        case 136: break;
        case 96: 
          { return sym(Terminals.VOID);
          }
        case 137: break;
        case 75: 
          { return sym(Terminals.RSHIFTEQ);
          }
        case 138: break;
        case 25: 
          { return sym(Terminals.AND);
          }
        case 139: break;
        case 116: 
          { return sym(Terminals.EXTENDS);
          }
        case 140: break;
        case 111: 
          { return sym(Terminals.THROWS);
          }
        case 141: break;
        case 81: 
          { return sym(Terminals.CHARACTER_LITERAL, "\\");
          }
        case 142: break;
        case 51: 
          { return sym(Terminals.ANDEQ);
          }
        case 143: break;
        case 58: 
          { return sym(Terminals.MODEQ);
          }
        case 144: break;
        case 115: 
          { return sym(Terminals.PUBLIC);
          }
        case 145: break;
        case 4: 
          { return sym(Terminals.MULT);
          }
        case 146: break;
        case 54: 
          { return sym(Terminals.OROR);
          }
        case 147: break;
        case 107: 
          { return sym(Terminals.ASSERT);
          }
        case 148: break;
        case 78: 
          { int val = Integer.parseInt(str().substring(2,len()-1),8);
			                             return sym(Terminals.CHARACTER_LITERAL, new Character((char)val).toString());
          }
        case 149: break;
        case 21: 
          { return sym(Terminals.NOT);
          }
        case 150: break;
        case 37: 
          { return sym(Terminals.LONG_LITERAL, str().substring(0,len()-1));
          }
        case 151: break;
        case 100: 
          { return sym(Terminals.THROW);
          }
        case 152: break;
        case 19: 
          { return sym(Terminals.GT);
          }
        case 153: break;
        case 32: 
          { error("unterminated string at end of line");
          }
        case 154: break;
        case 87: 
          { return sym(Terminals.ELSE);
          }
        case 155: break;
        case 18: 
          { return sym(Terminals.EQ);
          }
        case 156: break;
        case 65: 
          { strbuf.append( '\t' );
          }
        case 157: break;
        case 84: 
          { return sym(Terminals.CHARACTER_LITERAL, "\b");
          }
        case 158: break;
        case 31: 
          { strbuf.append(str());
          }
        case 159: break;
        case 11: 
          { return sym(Terminals.RPAREN);
          }
        case 160: break;
        case 44: 
          { return sym(Terminals.DO);
          }
        case 161: break;
        case 117: 
          { return sym(Terminals.BOOLEAN);
          }
        case 162: break;
        case 46: 
          { return sym(Terminals.GTEQ);
          }
        case 163: break;
        case 103: 
          { return sym(Terminals.CLASS);
          }
        case 164: break;
        case 94: 
          { return sym(Terminals.NULL_LITERAL);
          }
        case 165: break;
        case 95: 
          { return sym(Terminals.EOF);
          }
        case 166: break;
        case 34: 
          { return sym(Terminals.DIVEQ);
          }
        case 167: break;
        case 35: 
          { return sym(Terminals.MULTEQ);
          }
        case 168: break;
        case 121: 
          { return sym(Terminals.PRIVATE);
          }
        case 169: break;
        case 90: 
          { return sym(Terminals.BYTE);
          }
        case 170: break;