tenua.symbol
Class Value

java.lang.Object
  tenua.symbol.Symbol
      tenua.symbol.Value

Direct Known Subclasses:

Variable

public class Value
extends Symbol

A Symbol that has a value that can be pushed onto the stack

Author:

Daniel Wachsstock

Field Summary

static Value

ZERO

Fields inherited from class tenua.symbol.Symbol

CLEAR_STACK, maxPrecedence

Method Summary

void	eval(DoubleStack s, VariableMemento v) push the value onto the stack
double	getValue(VariableMemento v) get the value
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 Value ZERO

Method Detail

eval

public void eval(DoubleStack s,
                 VariableMemento v)

push the value onto the stack

Specified by:

eval in class Symbol

Parameters:

s - the stack to push onto

v - ignored

getValue

public double getValue(VariableMemento v)

get the value

Parameters:

v - ignored

Returns:

the value

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