step6
Class expr.yyLex

java.lang.Object
  step6.expr.yyLex

All Implemented Interfaces:

expr.yyInput

Enclosing class:

expr

public static class expr.yyLex
extends Object
implements expr.yyInput

Field Summary

protected int	token returned by token().
protected Object	value returned by value().
private int[]	yy_acpt
private boolean	yy_at_bol
private int	YY_BOL
private char[]	yy_buffer
private int	yy_buffer_end
private int	yy_buffer_index
private int	yy_buffer_read
private int	YY_BUFFER_SIZE
private int	yy_buffer_start
private int[]	yy_cmap
private int	YY_E_INTERNAL
private int	YY_E_MATCH
private int	YY_END
private int	YY_EOF
private boolean	yy_eof_done
private String[]	yy_error_string
private int	YY_F
private boolean	yy_last_was_cr
private int	yy_lexical_state
private int	YY_NO_ANCHOR
private int	YY_NO_STATE
private int	YY_NOT_ACCEPT
private int[][]	yy_nxt
private BufferedReader	yy_reader
private int[]	yy_rmap
private int	YY_START
private int[]	yy_state_dtrans
private int	YYINITIAL
private int	yyline

Constructor Summary

private	expr.yyLex()
	expr.yyLex(InputStream instream)
	expr.yyLex(Reader reader)

Method Summary

boolean	advance() move on to next token.
static void	main(expr.yyInput scanner) scanner test driver.
static void	main(String[] args) main program, generates and tests a scanner on standard input.
int	token() current input symbol.
String	toString() position for error message.
private int[][]	unpackFromString(int size1, int size2, String st)
Object	value() null or object associated with current input symbol.
static String	visible(String s) return a JLex-style visible rendering of a string.
private int	yy_advance()
private char[]	yy_double(char[] buf)
private void	yy_error(int code, boolean fatal)
private void	yy_mark_end()
private void	yy_mark_start()
private void	yy_move_end()
private void	yy_to_mark()
private void	yybegin(int state)
private int	yylength()
private String	yytext()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

YY_BUFFER_SIZE

private final int YY_BUFFER_SIZE

See Also:

Constant Field Values

YY_F

private final int YY_F

See Also:

Constant Field Values

YY_NO_STATE

private final int YY_NO_STATE

See Also:

Constant Field Values

YY_NOT_ACCEPT

private final int YY_NOT_ACCEPT

See Also:

Constant Field Values

YY_START

private final int YY_START

See Also:

Constant Field Values

YY_END

private final int YY_END

See Also:

Constant Field Values

YY_NO_ANCHOR

private final int YY_NO_ANCHOR

See Also:

Constant Field Values

YY_BOL

private final int YY_BOL

See Also:

Constant Field Values

YY_EOF

private final int YY_EOF

See Also:

Constant Field Values

token

protected int token

returned by token().

value

protected Object value

returned by value().

yy_reader

private BufferedReader yy_reader

yy_buffer_index

private int yy_buffer_index

yy_buffer_read

private int yy_buffer_read

yy_buffer_start

private int yy_buffer_start

yy_buffer_end

private int yy_buffer_end

yy_buffer

private char[] yy_buffer

yyline

private int yyline

yy_at_bol

private boolean yy_at_bol

yy_lexical_state

private int yy_lexical_state

yy_eof_done

private boolean yy_eof_done

YYINITIAL

private final int YYINITIAL

See Also:

Constant Field Values

yy_state_dtrans

private final int[] yy_state_dtrans

yy_last_was_cr

private boolean yy_last_was_cr

YY_E_INTERNAL

private final int YY_E_INTERNAL

See Also:

Constant Field Values

YY_E_MATCH

private final int YY_E_MATCH

See Also:

Constant Field Values

yy_error_string

private String[] yy_error_string

yy_acpt

private int[] yy_acpt

yy_cmap

private int[] yy_cmap

yy_rmap

private int[] yy_rmap

yy_nxt

private int[][] yy_nxt

Constructor Detail

expr.yyLex

public expr.yyLex(Reader reader)

expr.yyLex

public expr.yyLex(InputStream instream)

expr.yyLex

private expr.yyLex()

Method Detail

main

public static void main(String[] args)
                 throws IOException

main program, generates and tests a scanner on standard input.

Throws:

IOException

main

public static void main(expr.yyInput scanner)
                 throws IOException

scanner test driver.

Throws:

IOException

token

public int token()

current input symbol.

Specified by:

token in interface expr.yyInput

Returns:

current %token or single character.

value

public Object value()

null or object associated with current input symbol.

Specified by:

value in interface expr.yyInput

Returns:

value for expr.yyInput.token().

toString

public String toString()

position for error message.

Overrides:

toString in class Object

visible

public static String visible(String s)

return a JLex-style visible rendering of a string.

yybegin

private void yybegin(int state)

yy_advance

private int yy_advance()
                throws IOException

Throws:

IOException

yy_move_end

private void yy_move_end()

yy_mark_start

private void yy_mark_start()

yy_mark_end

private void yy_mark_end()

yy_to_mark

private void yy_to_mark()

yytext

private String yytext()

yylength

private int yylength()

yy_double

private char[] yy_double(char[] buf)

yy_error

private void yy_error(int code,
                      boolean fatal)

unpackFromString

private int[][] unpackFromString(int size1,
                                 int size2,
                                 String st)

advance

public boolean advance()
                throws IOException

Description copied from interface: expr.yyInput

move on to next token.

Specified by:

advance in interface expr.yyInput

Returns:

false if positioned beyond tokens.

Throws:

IOException - on input error.