mirror of https://github.com/jkjoy/sunpeiwen.git
44 lines
1.3 KiB
JavaScript
44 lines
1.3 KiB
JavaScript
'use strict';
|
|
|
|
var callBind = require('call-bind');
|
|
var callBound = require('call-bind/callBound');
|
|
var GetIntrinsic = require('get-intrinsic');
|
|
var isTypedArray = require('is-typed-array');
|
|
|
|
var $ArrayBuffer = GetIntrinsic('ArrayBuffer', true);
|
|
var $Float32Array = GetIntrinsic('Float32Array', true);
|
|
var $byteLength = callBound('ArrayBuffer.prototype.byteLength', true);
|
|
|
|
// in node 0.10, ArrayBuffers have no prototype methods, but have an own slot-checking `slice` method
|
|
var abSlice = $ArrayBuffer && !$byteLength && new $ArrayBuffer().slice;
|
|
var $abSlice = abSlice && callBind(abSlice);
|
|
|
|
module.exports = $byteLength || $abSlice
|
|
? function isArrayBuffer(obj) {
|
|
if (!obj || typeof obj !== 'object') {
|
|
return false;
|
|
}
|
|
try {
|
|
if ($byteLength) {
|
|
$byteLength(obj);
|
|
} else {
|
|
$abSlice(obj, 0);
|
|
}
|
|
return true;
|
|
} catch (e) {
|
|
return false;
|
|
}
|
|
}
|
|
: $Float32Array
|
|
// in node 0.8, ArrayBuffers have no prototype or own methods
|
|
? function IsArrayBuffer(obj) {
|
|
try {
|
|
return (new $Float32Array(obj)).buffer === obj && !isTypedArray(obj);
|
|
} catch (e) {
|
|
return typeof obj === 'object' && e.name === 'RangeError';
|
|
}
|
|
}
|
|
: function isArrayBuffer(obj) { // eslint-disable-line no-unused-vars
|
|
return false;
|
|
};
|