yylex.java

java读写Excel文档的API

      char newBuffer[] = new char[zzCurrentPos*2];
      System.arraycopy(zzBuffer, 0, newBuffer, 0, zzBuffer.length);
      zzBuffer = newBuffer;
    }

    /* finally: fill the buffer with new input */
    int numRead = zzReader.read(zzBuffer, zzEndRead,
                                            zzBuffer.length-zzEndRead);

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

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

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


  /**
   * Resets the scanner to read from a new input stream.
   * Does not close the old reader.
   *
   * 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 ParseItem yylex() throws java.io.IOException,  jxl.biff.formula.FormulaException
 {
    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;

      yychar+= zzMarkedPosL-zzStartRead;

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

      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();
          zzEndReadL = zzEndRead;
          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 12: 
          { return new Minus() ;
          }
        case 31: break;
        case 7: 
          { return new CloseParentheses() ;
          }
        case 32: break;
        case 3: 
          { return new IntegerValue(yytext()) ;
          }
        case 33: break;
        case 24: 
          { return new DoubleValue(yytext()) ;
          }
        case 34: break;
        case 29: 
          { return new ColumnRange3d(yytext(),externalSheet) ;
          }
        case 35: break;
        case 4: 
          { return new RangeSeparator();
          }
        case 36: break;
        case 10: 
          { return new Divide() ;
          }
        case 37: break;
        case 25: 
          { return new CellReference3d(yytext(),externalSheet) ;
          }
        case 38: break;
        case 26: 
          { return new BooleanValue(yytext());
          }
        case 39: break;
        case 15: 
          { return new Equal() ;
          }
        case 40: break;
        case 17: 
          { yybegin(YYINITIAL); if (emptyString) return new StringValue("");
          }
        case 41: break;
        case 8: 
          { emptyString = true; yybegin(YYSTRING);
          }
        case 42: break;
        case 21: 
          { return new NotEqual() ;
          }
        case 43: break;
        case 22: 
          { return new LessEqual() ;
          }
        case 44: break;
        case 16: 
          { return new LessThan() ;
          }
        case 45: break;
        case 5: 
          { return new ArgumentSeparator() ;
          }
        case 46: break;
        case 30: 
          { return new Area3d(yytext(),externalSheet) ;
          }
        case 47: break;
        case 14: 
          { return new GreaterThan() ;
          }
        case 48: break;
        case 18: 
          { return new CellReference(yytext()) ;
          }
        case 49: break;
        case 20: 
          { return new GreaterEqual() ;
          }
        case 50: break;
        case 27: 
          { return new Area(yytext()) ;
          }
        case 51: break;
        case 23: 
          { return new ColumnRange(yytext());
          }
        case 52: break;
        case 1: 
          { emptyString = false; return new StringValue(yytext()) ;
          }
        case 53: break;
        case 2: 
          { return new NameRange(yytext(), nameTable);
          }
        case 54: break;
        case 19: 
          { return new StringFunction(yytext()) ;
          }
        case 55: break;
        case 11: 
          { return new Plus() ;
          }
        case 56: break;
        case 28: 
          { return new ErrorConstant(yytext());
          }
        case 57: break;
        case 9: 
          { 
          }
        case 58: break;
        case 13: 
          { return new Multiply() ;
          }
        case 59: break;
        case 6: 
          { return new OpenParentheses() ;
          }
        case 60: break;
        default: 
          if (zzInput == YYEOF && zzStartRead == zzCurrentPos) {
            zzAtEOF = true;
            return null;
          } 
          else {
            zzScanError(ZZ_NO_MATCH);
          }
      }
    }
  }


}