main.js (1796B)
1 /** 2 * @license Apache-2.0 3 * 4 * Copyright (c) 2021 The Stdlib Authors. 5 * 6 * Licensed under the Apache License, Version 2.0 (the "License"); 7 * you may not use this file except in compliance with the License. 8 * You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 */ 18 19 'use strict'; 20 21 // MODULES // 22 23 var isDataView = require( './../../is-dataview' ); 24 var ArrayBuffer = require( '@stdlib/array/buffer' ); 25 var GlobalDataView = require( './dataview.js' ); 26 27 28 // MAIN // 29 30 /** 31 * Tests for native `DataView` support. 32 * 33 * @returns {boolean} boolean indicating if an environment has `DataView` support 34 * 35 * @example 36 * var bool = hasDataViewSupport(); 37 * // returns <boolean> 38 */ 39 function hasDataViewSupport() { 40 var bool; 41 var view; 42 var buf; 43 44 if ( typeof GlobalDataView !== 'function' ) { 45 return false; 46 } 47 // Test basic support... 48 try { 49 buf = new ArrayBuffer( 24 ); 50 view = new GlobalDataView( buf, 8 ); 51 bool = ( isDataView( view ) && typeof view.getFloat64 === 'function' && typeof view.setFloat64 === 'function' ); 52 if ( bool ) { 53 view.setFloat64( 0, -3.14 ); 54 view.setFloat64( 8, NaN ); 55 bool = ( 56 bool && 57 view.buffer === buf && 58 view.byteLength === 16 && 59 view.byteOffset === 8 && 60 view.getFloat64( 0 ) === -3.14 && 61 view.getFloat64( 8 ) !== view.getFloat64( 8 ) 62 ); 63 } 64 } catch ( err ) { // eslint-disable-line no-unused-vars 65 bool = false; 66 } 67 return bool; 68 } 69 70 71 // EXPORTS // 72 73 module.exports = hasDataViewSupport;