lucene/gradle/generation/jflex/skeleton.disable.buffer.expansion.txt

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

  /** initial size of the lookahead buffer */
--- private static final int ZZ_BUFFERSIZE = ...;

  /** lexical states */
---  lexical states, charmap

  /* error codes */
  private static final int ZZ_UNKNOWN_ERROR = 0;
  private static final int ZZ_NO_MATCH = 1;
  private static final int ZZ_PUSHBACK_2BIG = 2;

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

--- isFinal list
  /** the input device */
  private java.io.Reader zzReader;

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

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

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

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

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

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

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

  /** 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;

  /** 
   * zzAtBOL == true iff the scanner is currently at the beginning of a line
   */
  private boolean zzAtBOL = true;

  /** zzAtEOF == true iff the scanner is at the EOF */
  private boolean zzAtEOF;

  /** denotes if the user-EOF-code has already been executed */
  private boolean zzEOFDone;
  
  /** 
   * The number of occupied positions in zzBuffer beyond zzEndRead.
   * When a lead/high surrogate has been read from the input stream
   * into the final zzBuffer position, this will have a value of 1;
   * otherwise, it will have a value of 0.
   */
  private int zzFinalHighSurrogate = 0;

--- user class code

--- constructor declaration

/* -------------------------------------------------------------------------------- */
/* Begin Lucene-specific disable-buffer-expansion modifications to skeleton.default */

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

    /* first: make room (if you can) */
    if (zzStartRead > 0) {
      zzEndRead += zzFinalHighSurrogate;
      zzFinalHighSurrogate = 0;
      System.arraycopy(zzBuffer, zzStartRead,
                       zzBuffer, 0,
                       zzEndRead-zzStartRead);

      /* translate stored positions */
      zzEndRead-= zzStartRead;
      zzCurrentPos-= zzStartRead;
      zzMarkedPos-= zzStartRead;
      zzStartRead = 0;
    }


    /* fill the buffer with new input */
    int requested = zzBuffer.length - zzEndRead - zzFinalHighSurrogate;
    if (requested == 0) {
      return true;
    }
    int numRead = zzReader.read(zzBuffer, zzEndRead, requested);

    /* not supposed to occur according to specification of java.io.Reader */
    if (numRead == 0) {
      throw new java.io.IOException("Reader returned 0 characters. See JFlex examples for workaround.");
    }
    if (numRead > 0) {
      zzEndRead += numRead;
      if (Character.isHighSurrogate(zzBuffer[zzEndRead - 1])) {
        if (numRead == requested) { // We might have requested too few chars to encode a full Unicode character.
          --zzEndRead;
          zzFinalHighSurrogate = 1;
          if (numRead == 1) {
            return true;
          }
        } else {                    // There is room in the buffer for at least one more char
          int c = zzReader.read();  // Expecting to read a low surrogate char
          if (c == -1) {
            return true;
          } else {
            zzBuffer[zzEndRead++] = (char)c;
            return false;
          }
        }
      }
      /* potentially more input available */
      return false;
    }

    /* numRead < 0 ==> end of stream */
    return true;
  }

/* End Lucene-specific disable-buffer-expansion modifications to skeleton.default */
/* ------------------------------------------------------------------------------ */
    
  /**
   * 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 <code>ZZ_INITIAL</code>.
   *
   * Internal scan buffer is resized down to its initial length, if it has grown.
   *
   * @param reader   the new input stream 
   */
  public final void yyreset(java.io.Reader reader) {
    zzReader = reader;
    zzAtBOL  = true;
    zzAtEOF  = false;
    zzEOFDone = false;
    zzEndRead = zzStartRead = 0;
    zzCurrentPos = zzMarkedPos = 0;
    zzFinalHighSurrogate = 0;
    yyline = yychar = yycolumn = 0;
    zzLexicalState = YYINITIAL;
    if (zzBuffer.length > ZZ_BUFFERSIZE)
      zzBuffer = new char[ZZ_BUFFERSIZE];
  }


  /**
   * 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 <code>pos</code> 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
   */
--- zzScanError declaration
    String message;
    try {
      message = ZZ_ERROR_MSG[errorCode];
    }
    catch (ArrayIndexOutOfBoundsException e) {
      message = ZZ_ERROR_MSG[ZZ_UNKNOWN_ERROR];
    }

--- throws clause
  } 


  /**
   * 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()!
   */
--- yypushback decl (contains zzScanError exception)
    if ( number > yylength() )
      zzScanError(ZZ_PUSHBACK_2BIG);

    zzMarkedPos -= number;
  }


--- zzDoEOF
  /**
   * 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
   */
--- yylex declaration
    int zzInput;
    int zzAction;

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

--- local declarations

    while (true) {
      zzMarkedPosL = zzMarkedPos;

--- start admin (line, char, col count)
      zzAction = -1;

      zzCurrentPosL = zzCurrentPos = zzStartRead = zzMarkedPosL;
  
--- start admin (lexstate etc)

      zzForAction: {
        while (true) {
    
--- next input, line, col, char count, next transition, isFinal action
            zzAction = zzState;
            zzMarkedPosL = zzCurrentPosL;
--- line count update
          }

        }
      }

      // store back cached position
      zzMarkedPos = zzMarkedPosL;
--- char count update

      if (zzInput == YYEOF && zzStartRead == zzCurrentPos) {
        zzAtEOF = true;
--- eofvalue
      }
      else {
--- actions
          default:
--- no match
        }
      }
    }
  }

--- main

}