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Do not polyfill {Uint8Array,Float64Array}#slice if it already exists #76

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Do not polyfill {Uint8Array,Float64Array}#slice if it already exists #76

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65 changes: 34 additions & 31 deletions src/external/nacl-fast.js
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Original file line number Diff line number Diff line change
Expand Up @@ -3,41 +3,44 @@


// polyfill for TypedArray.prototype.slice()
Uint8Array.prototype.slice = function(start, end) {
var len = this.length;
var relativeStart = start;
var k = (relativeStart < 0) ? max(len + relativeStart, 0) : Math.min(relativeStart, len);
var relativeEnd = (end === undefined) ? len : end;
var final = (relativeEnd < 0) ? max(len + relativeEnd, 0) : Math.min(relativeEnd, len);
var count = final - k;
var c = this.constructor;
var a = new c(count);
var n = 0;
while (k < final) {
a[n] = JSON.parse(JSON.stringify(this[k]));
k++;
n++;
if (!Uint8Array.prototype.slice) {
Uint8Array.prototype.slice = function(start, end) {
var len = this.length;
var relativeStart = start;
var k = (relativeStart < 0) ? Math.max(len + relativeStart, 0) : Math.min(relativeStart, len);
var relativeEnd = (end === undefined) ? len : end;
var final = (relativeEnd < 0) ? Math.max(len + relativeEnd, 0) : Math.min(relativeEnd, len);
var count = final - k;
var c = this.constructor;
var a = new c(count);
var n = 0;
while (k < final) {
a[n] = JSON.parse(JSON.stringify(this[k]));
k++;
n++;
}
return a;
}
return a;
}


Float64Array.prototype.slice = function(start, end) {
var len = this.length;
var relativeStart = start;
var k = (relativeStart < 0) ? max(len + relativeStart, 0) : Math.min(relativeStart, len);
var relativeEnd = (end === undefined) ? len : end;
var final = (relativeEnd < 0) ? max(len + relativeEnd, 0) : Math.min(relativeEnd, len);
var count = final - k;
var c = this.constructor;
var a = new c(count);
var n = 0;
while (k < final) {
a[n] = JSON.parse(JSON.stringify(this[k]));
k++;
n++;
if (!Float64Array.prototype.slice) {
Float64Array.prototype.slice = function(start, end) {
var len = this.length;
var relativeStart = start;
var k = (relativeStart < 0) ? Math.max(len + relativeStart, 0) : Math.min(relativeStart, len);
var relativeEnd = (end === undefined) ? len : end;
var final = (relativeEnd < 0) ? Math.max(len + relativeEnd, 0) : Math.min(relativeEnd, len);
var count = final - k;
var c = this.constructor;
var a = new c(count);
var n = 0;
while (k < final) {
a[n] = JSON.parse(JSON.stringify(this[k]));
k++;
n++;
}
return a;
}
return a;
}

// Ported in 2014 by Dmitry Chestnykh and Devi Mandiri.
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