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Add native support for Uint8Array types (qzind#1098)
Add native support for Uint8Array types Closes qzind#1088 Related qzind#1087
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,76 @@ | ||
| if (!Array.from) { | ||
| Array.from = (function () { | ||
| var toStr = Object.prototype.toString; | ||
| var isCallable = function (fn) { | ||
| return typeof fn === 'function' || toStr.call(fn) === '[object Function]'; | ||
| }; | ||
| var toInteger = function (value) { | ||
| var number = Number(value); | ||
| if (isNaN(number)) { return 0; } | ||
| if (number === 0 || !isFinite(number)) { return number; } | ||
| return (number > 0 ? 1 : -1) * Math.floor(Math.abs(number)); | ||
| }; | ||
| var maxSafeInteger = Math.pow(2, 53) - 1; | ||
| var toLength = function (value) { | ||
| var len = toInteger(value); | ||
| return Math.min(Math.max(len, 0), maxSafeInteger); | ||
| }; | ||
|
|
||
| // The length property of the from method is 1. | ||
| return function from(arrayLike/*, mapFn, thisArg */) { | ||
| // 1. Let C be the this value. | ||
| var C = this; | ||
|
|
||
| // 2. Let items be ToObject(arrayLike). | ||
| var items = Object(arrayLike); | ||
|
|
||
| // 3. ReturnIfAbrupt(items). | ||
| if (arrayLike == null) { | ||
| throw new TypeError("Array.from requires an array-like object - not null or undefined"); | ||
| } | ||
|
|
||
| // 4. If mapfn is undefined, then let mapping be false. | ||
| var mapFn = arguments.length > 1 ? arguments[1] : void undefined; | ||
| var T; | ||
| if (typeof mapFn !== 'undefined') { | ||
| // 5. else | ||
| // 5. a If IsCallable(mapfn) is false, throw a TypeError exception. | ||
| if (!isCallable(mapFn)) { | ||
| throw new TypeError('Array.from: when provided, the second argument must be a function'); | ||
| } | ||
|
|
||
| // 5. b. If thisArg was supplied, let T be thisArg; else let T be undefined. | ||
| if (arguments.length > 2) { | ||
| T = arguments[2]; | ||
| } | ||
| } | ||
|
|
||
| // 10. Let lenValue be Get(items, "length"). | ||
| // 11. Let len be ToLength(lenValue). | ||
| var len = toLength(items.length); | ||
|
|
||
| // 13. If IsConstructor(C) is true, then | ||
| // 13. a. Let A be the result of calling the [[Construct]] internal method of C with an argument list containing the single item len. | ||
| // 14. a. Else, Let A be ArrayCreate(len). | ||
| var A = isCallable(C) ? Object(new C(len)) : new Array(len); | ||
|
|
||
| // 16. Let k be 0. | ||
| var k = 0; | ||
| // 17. Repeat, while k < len… (also steps a - h) | ||
| var kValue; | ||
| while (k < len) { | ||
| kValue = items[k]; | ||
| if (mapFn) { | ||
| A[k] = typeof T === 'undefined' ? mapFn(kValue, k) : mapFn.call(T, kValue, k); | ||
| } else { | ||
| A[k] = kValue; | ||
| } | ||
| k += 1; | ||
| } | ||
| // 18. Let putStatus be Put(A, "length", len, true). | ||
| A.length = len; | ||
| // 20. Return A. | ||
| return A; | ||
| }; | ||
| }()); | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,21 @@ | ||
| /** | ||
| * String.prototype.padStart() polyfill | ||
| * https://github.com/uxitten/polyfill/blob/master/string.polyfill.js | ||
| * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/padStart | ||
| */ | ||
| if (!String.prototype.padStart) { | ||
| String.prototype.padStart = function padStart(targetLength,padString) { | ||
| targetLength = targetLength>>0; //truncate if number or convert non-number to 0; | ||
| padString = String((typeof padString !== 'undefined' ? padString : ' ')); | ||
| if (this.length > targetLength) { | ||
| return String(this); | ||
| } | ||
| else { | ||
| targetLength = targetLength-this.length; | ||
| if (targetLength > padString.length) { | ||
| padString += padString.repeat(targetLength/padString.length); //append to original to ensure we are longer than needed | ||
| } | ||
| return padString.slice(0,targetLength) + String(this); | ||
| } | ||
| }; | ||
| } |
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