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util.js
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util.js
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// This file adds a few basic functions as globals or prototypes.
function assert(clause, message) {
if (!clause) {
throw new Error(message);
}
}
// Returns true if this array equals the other, element-by-element.
arraysEqual = function(first, second) {
return !(first < second) && !(second < first);
}
// Returns true if this maybe-array equals the other maybe-array, where
// a maybe-array is either an array or undefined.
maybeArraysEqual = function(first, second) {
if (!first !== !second) {
return false;
}
return arraysEqual(first, second);
}
function extend(child, parent) {
for (var key in parent) {
if (parent.hasOwnProperty(key)) {
child[key] = parent[key];
}
}
function ctor() {
this.constructor = child;
}
ctor.prototype = parent.prototype;
child.prototype = new ctor();
child.__super__ = parent.prototype;
}
// Partial bind polyfill for older versions of Safari from:
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/bind
if (!Function.prototype.bind) {
Function.prototype.bind = function (oThis) {
if (typeof this !== "function") {
// closest thing possible to the ECMAScript 5
// internal IsCallable function
throw new TypeError("Function.prototype.bind - what is trying to be bound is not callable");
}
var aArgs = Array.prototype.slice.call(arguments, 1),
fToBind = this,
fNOP = function () {},
fBound = function () {
return fToBind.apply(this instanceof fNOP && oThis
? this
: oThis,
aArgs.concat(Array.prototype.slice.call(arguments)));
};
fNOP.prototype = this.prototype;
fBound.prototype = new fNOP();
return fBound;
};
}