tenua.symbol
Class Assignment

java.lang.Object
  tenua.symbol.Symbol
      tenua.symbol.Assignment

public class Assignment
extends Symbol

A Symbol that handles assignment to a variable from the stack

Author:

Daniel Wachsstock

Field Summary

Fields inherited from class tenua.symbol.Symbol

CLEAR_STACK, maxPrecedence

Method Summary

void	eval(DoubleStack s, VariableMemento v) assigns a value to the stored variable
Variable	getTarget()
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

Method Detail

eval

public void eval(DoubleStack s,
                 VariableMemento v)

assigns a value to the stored variable

Specified by:

eval in class Symbol

Parameters:

s - the stack to pop the value from

v - the memento to have the variable use

getTarget

public Variable getTarget()

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