tenua.symbol
Class Power

java.lang.Object
  tenua.symbol.Symbol
      tenua.symbol.Power

public class Power
extends Symbol

A Symbol that represents an integer power

Author:

Daniel Wachsstock

Field Summary

static Power	FIVE
static Power	FOUR
static Power	ONE
static Power	SEVEN
static Power	SIX
static Power	THREE
static Power	TWO
static Power	ZERO

Fields inherited from class tenua.symbol.Symbol

CLEAR_STACK, maxPrecedence

Method Summary

void	eval(DoubleStack s, VariableMemento v) evaluate the Symbol
static Power	getInstance(int i)
java.lang.String	toString()
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 java.lang.Object

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

Field Detail

ZERO

public static final Power ZERO

ONE

public static final Power ONE

TWO

public static final Power TWO

THREE

public static final Power THREE

FOUR

public static final Power FOUR

FIVE

public static final Power FIVE

SIX

public static final Power SIX

SEVEN

public static final Power SEVEN

Method Detail

getInstance

public static Power getInstance(int i)

eval

public void eval(DoubleStack s,
                 VariableMemento v)

Description copied from class: Symbol

evaluate the Symbol

Specified by:

eval in class Symbol

Parameters:

s - the stack from which to pop arguments and to which to push results

v - the memento representing the current values of variables. If v is null, then use the default values

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

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