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 code for "Unknown internal scanner error". */
  private static final int ZZ_UNKNOWN_ERROR = 0;
  /** Error code for "could not match input". */
  private static final int ZZ_NO_MATCH = 1;
  /** Error code for "pushback value was too large". */
  private static final int ZZ_PUSHBACK_2BIG = 2;

  /**
   * Error messages for {@link #ZZ_UNKNOWN_ERROR}, {@link #ZZ_NO_MATCH}, and
   * {@link #ZZ_PUSHBACK_2BIG} respectively.
   */
  private static final String ZZ_ERROR_MSG[] = {
    "Unknown internal scanner error",
    "Error: could not match input",
    "Error: pushback value was too large"
  };

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

  /** Current state of the DFA. */
  private int zzState;

  /** Current lexical state. */
  private int zzLexicalState = YYINITIAL;

  /**
   * This buffer contains the current text to be matched and is the source of the {@link #yytext()}
   * string.
   */
  private char zzBuffer[] = new char[ZZ_BUFFERSIZE];

  /** Text position at the last accepting state. */
  private int zzMarkedPos;

  /** Current text position in the buffer. */
  private int zzCurrentPos;

  /** Marks the beginning of the {@link #yytext()} string in the buffer. */
  private int zzStartRead;

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

  /**
   * Whether the scanner is at the end of file.
   * @see #yyatEOF
   */
  private boolean zzAtEOF;

  /**
   * The number of occupied positions in {@link #zzBuffer} beyond {@link #zzEndRead}.
   *
   * <p>When a lead/high surrogate has been read from the input stream into the final
   * {@link #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

  /**
   * Refills the input buffer.
   *
   * @return {@code false} 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/zero-reader for a workaround.");
    }
    if (numRead > 0) {
      zzEndRead += numRead;
      if (Character.isHighSurrogate(zzBuffer[zzEndRead - 1])) {
        if (numRead == requested) { // We 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 paired low surrogate char
          if (c == -1) {
            return true;
          } else {
            zzBuffer[zzEndRead++] = (char)c;
          }
        }
      }
      /* potentially more input available */
      return false;
    }

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


  /**
   * Closes the input reader.
   *
   * @throws java.io.IOException if the reader could not be closed.
   */
  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.
   *
   * <p>Does not close the old reader.
   *
   * <p>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}.
   *
   * <p>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;
    zzEOFDone = false;
    yyResetPosition();
    zzLexicalState = YYINITIAL;
    if (zzBuffer.length > ZZ_BUFFERSIZE) {
      zzBuffer = new char[ZZ_BUFFERSIZE];
    }
  }

  /**
   * Resets the input position.
   */
  private final void yyResetPosition() {
      zzAtBOL  = true;
      zzAtEOF  = false;
      zzCurrentPos = 0;
      zzMarkedPos = 0;
      zzStartRead = 0;
      zzEndRead = 0;
      zzFinalHighSurrogate = 0;
      yyline = 0;
      yycolumn = 0;
      yychar = 0L;
  }


  /**
   * Returns whether the scanner has reached the end of the reader it reads from.
   *
   * @return whether the scanner has reached EOF.
   */
  public final boolean yyatEOF() {
    return zzAtEOF;
  }


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


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


  /**
   * How many characters were matched.
   *
   * @return the length of the matched text region.
   */
  public final int yylength() {
    return zzMarkedPos-zzStartRead;
  }


  /**
   * Reports an error that occurred while scanning.
   *
   * <p>In a well-formed scanner (no or only correct usage of {@code yypushback(int)} and a
   * match-all fallback rule) this method will only be called with things that
   * "Can't Possibly Happen".
   *
   * <p>If this method is called, something is seriously wrong (e.g. a JFlex bug producing a faulty
   * scanner etc.).
   *
   * <p>Usual syntax/scanner level error handling should be done in error fallback rules.
   *
   * @param errorCode the code of the error message 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.
   *
   * <p>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
   *     {@link #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;

--- 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

}