sjm.examples.midimath
Class Midiloop

java.lang.Object
  |
  +--sjm.examples.midimath.Midiloop

public class Midiloop

extends java.lang.Object

This class creates and uses a parser that aims to recognize simple arithmetic expressions, but gets caught in a loop. Allowable expressions include the use of multiplication, addition and parentheses. The grammar for this language is:

	
     expression = term ('+' term)*;
     term       = factor ('*' factor)*;
     factor     = '(' expression ')' | Num;
 

This class implements this grammar as a utility class, but introduces a definitional loop in so doing.

Constructor Summary

Midiloop()

Method Summary

Parser	expression() Returns a parser that will recognize a Midimath expression.
protected Parser	factor() Returns a parser that will recognize either numbers, or arithmetic expressions in parentheses.
static void	main(java.lang.String[] args) Demonstrate an infinite loop!
protected Parser	term() Returns a parser that will recognize arithmetic expressions containing just multiplication.

Methods inherited from class java.lang.Object

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

Constructor Detail

Midiloop

public Midiloop()

Method Detail

expression

public Parser expression()

Returns a parser that will recognize a Midimath expression.

Returns:

a parser that will recognize a Midimath expression

factor

protected Parser factor()

Returns a parser that will recognize either numbers, or arithmetic expressions in parentheses.

Returns:

a parser that will recognize either numbers, or arithmetic expressions in parentheses

main

public static void main(java.lang.String[] args)

Demonstrate an infinite loop!

term

protected Parser term()

Returns a parser that will recognize arithmetic expressions containing just multiplication.

Returns:

a parser that will recognize arithmetic expressions containing just multiplication