swisscalc.lib.operator.js

//
// Eric Morgan
// Copyright (c) 2014. 
//

// Generic operator class. Implementation of individual operators will be defined in the OperatorCache.
// "evaluate" should be a function that takes a swisscalc.lib.shuntingYard instance as a parameter and returns the result.
var swisscalc = swisscalc || {};
swisscalc.lib = swisscalc.lib || {};
swisscalc.lib.operator = function(arity, associativity, precedence, numOperands, isOpenParen, isCloseParen, evaluate) {
	this.Arity 			= arity;
	this.Associativity 	= associativity;
	this.Precedence 	= precedence;
	this.NumOperands 	= numOperands;
	this.IsOpenParen 	= isOpenParen;
	this.IsCloseParen 	= isCloseParen;
	this.evaluate   	= evaluate;
};

// Constants
swisscalc.lib.operator.ARITY_NULLARY 		= 0;
swisscalc.lib.operator.ARITY_UNARY 			= 1;
swisscalc.lib.operator.ARITY_BINARY 		= 2;
swisscalc.lib.operator.ASSOCIATIVITY_NONE 	= 0;
swisscalc.lib.operator.ASSOCIATIVITY_RIGHT 	= 1;
swisscalc.lib.operator.ASSOCIATIVITY_LEFT 	= 2;

// Static functions
swisscalc.lib.operator.degreesToRadians = function(degrees) { return degrees * (Math.PI / 180.0); };
swisscalc.lib.operator.radiansToDegrees = function(radians) { return radians * (180.0 / Math.PI); };

// Returns true if precedence is higher than given operator
swisscalc.lib.operator.prototype.isHigherPrecedence = function(operator) {
	if (this.Precedence == operator.Precedence)
		return (this.Associativity == swisscalc.lib.operator.ASSOCIATIVITY_LEFT);
	return (this.Precedence > operator.Precedence);
};