sjm.examples.midimath
Class MidiParser

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

public class MidiParser

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, and avoids looping while building the subparsers.

Field Summary

protected static Sequence

expression

Constructor Summary

MidiParser()

Method Summary

Parser	expression() Returns a parser that will recognize a Midimath expression.
static void	main(java.lang.String[] args) Demonstrate that this utility class does not loop.
protected Parser	minusTerm()
protected Parser	term()

Methods inherited from class java.lang.Object

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

Field Detail

expression

protected static Sequence expression

Constructor Detail

MidiParser

public MidiParser()

Method Detail

expression

public Parser expression()

Returns a parser that will recognize a Midimath expression.

Returns:

a parser that will recognize a Midimath expression

main

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

Demonstrate that this utility class does not loop.

minusTerm

protected Parser minusTerm()

term

protected Parser term()