coins.ffront
Interface Parser.yyInput

All Known Implementing Classes:

Scanner

Enclosing interface:

Parser

public static interface Parser.yyInput

must be implemented by a scanner object to supply input to the parser.

Method Summary

boolean	advance() move on to next token.
int	token() classifies current token.
java.lang.Object	value() associated with current token.

Method Detail

advance

public boolean advance()
                throws java.io.IOException

move on to next token.

Returns:

false if positioned beyond tokens.

Throws:

IOException - on input error.

token

public int token()

classifies current token. Should not be called if advance() returned false.

Returns:

current %token or single character.

value

public java.lang.Object value()

associated with current token. Should not be called if advance() returned false.

Returns:

value for token().