tenua.symbol
Class Unary

java.lang.Object
  tenua.symbol.Symbol
      tenua.symbol.Unary

public abstract class Unary
extends Symbol

A Symbol that represents a unary operator. does nothing that a regular Symbol doesn't. but is useful for distinguishing types

Author:

Daniel Wachsstock

Field Summary

static Unary	EXP
static Unary	LN
static Unary	NEGATE
static Unary	NOT

Fields inherited from class tenua.symbol.Symbol

CLEAR_STACK, maxPrecedence

Method Summary

void	toString(java.util.Stack stringStack, java.util.Stack precedenceStack, SymbolTable st) pushes a StringBuffer that reflects this Symbol, with all its arguments

Methods inherited from class tenua.symbol.Symbol

eval

Methods inherited from class java.lang.Object

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

Field Detail

NEGATE

public static final Unary NEGATE

NOT

public static final Unary NOT

EXP

public static final Unary EXP

LN

public static final Unary LN

Method Detail

toString

public void toString(java.util.Stack stringStack,
                     java.util.Stack precedenceStack,
                     SymbolTable st)

Description copied from class: Symbol

pushes a StringBuffer that reflects this Symbol, with all its arguments

Overrides:

toString in class Symbol

Parameters:

stringStack - the stack of StringBuffer from which to pop arguments and to which to push results

precedenceStack - a stack to be push'ed and pop'ed in parallel with stringStack that contains Integers, corresponding to the precedence of the arguments onstringStack. This is used to determine placement of parentheses. Anything other than a binary operation should push Symbol.maxPrecedence

st - the SymbolTable to get Symbol names from Note: the name is a misnomer; it uses StringBuffer's, not String's