tenua.symbol
Class Binary

java.lang.Object
  tenua.symbol.Symbol
      tenua.symbol.Binary

public abstract class Binary
extends Symbol

Symbol subclass that represents a binary operator. allows for precedence and associativity
Also exposes a large number of standard operators

Author:

Daniel Wachsstock

Field Summary

static Binary	ADD
static Binary	AND
static Binary	DIV
static Binary	EQ
static Binary	GE
static Binary	GT
static Binary	IF
static Binary	LE
static Binary	LT
static Binary	MOD
static Binary	MUL
static Binary	NE
static Binary	OR
static Binary	POW
static Binary	SUB

Fields inherited from class tenua.symbol.Symbol

CLEAR_STACK, maxPrecedence

Method Summary

abstract boolean	leftAssociative() the associativity of this operator
abstract int	precedence() the precedence of this operator
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

ADD

public static final Binary ADD

SUB

public static final Binary SUB

MUL

public static final Binary MUL

DIV

public static final Binary DIV

MOD

public static final Binary MOD

POW

public static final Binary POW

AND

public static final Binary AND

OR

public static final Binary OR

EQ

public static final Binary EQ

NE

public static final Binary NE

LE

public static final Binary LE

GE

public static final Binary GE

LT

public static final Binary LT

GT

public static final Binary GT

IF

public static final Binary IF

Method Detail

precedence

public abstract int precedence()

the precedence of this operator

leftAssociative

public abstract boolean leftAssociative()

the associativity of this operator

Returns:

true if it is left-associative, false if right-associative

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