exp
Class Lexer

java.lang.Object
  |
  +--java.io.StreamTokenizer
        |
        +--exp.Lexer

Direct Known Subclasses:

LispLexer, PrologLexer

public abstract class Lexer

extends java.io.StreamTokenizer

Lexer Analizzatore lessicale genreico

Version:

8/12/1999

Author:

Marco Chiesi

Field Summary

protected Sexp	curToken Token corrente
protected OutputDevice	msgOut Dispositivo di output

Fields inherited from class java.io.StreamTokenizer

nval, sval, TT_EOF, TT_EOL, TT_NUMBER, TT_WORD, ttype

Constructor Summary

Lexer(java.io.InputStream is)

Lexer(java.io.Reader r)
Costruttori

Lexer(java.lang.String s)

Lexer(java.lang.String s, OutputDevice msgOut)

Method Summary

abstract Sexp	next() Restituzione del prossimo token
void	print(java.lang.String s) Scrittura di un messaggio in output
void	println(java.lang.String s)

Methods inherited from class java.io.StreamTokenizer

commentChar, eolIsSignificant, lineno, lowerCaseMode, nextToken, ordinaryChar, ordinaryChars, parseNumbers, pushBack, quoteChar, resetSyntax, slashSlashComments, slashStarComments, toString, whitespaceChars, wordChars

Methods inherited from class java.lang.Object

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

Field Detail

curToken

protected Sexp curToken

Token corrente

msgOut

protected OutputDevice msgOut

Dispositivo di output

Constructor Detail

Lexer

public Lexer(java.io.Reader r)

Costruttori

Lexer

public Lexer(java.io.InputStream is)
      throws java.lang.Exception

Lexer

public Lexer(java.lang.String s)
      throws java.lang.Exception

Lexer

public Lexer(java.lang.String s,
             OutputDevice msgOut)
      throws java.lang.Exception

Method Detail

print

public void print(java.lang.String s)

Scrittura di un messaggio in output

println

public void println(java.lang.String s)

next

public abstract Sexp next()
                   throws java.lang.Exception

Restituzione del prossimo token