tojson.js (1935B)
1 /** 2 * @license Apache-2.0 3 * 4 * Copyright (c) 2018 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 real = require( '@stdlib/complex/real' ); 24 var imag = require( '@stdlib/complex/imag' ); 25 26 27 // MAIN // 28 29 /** 30 * Serializes an ndarray as a JSON object. 31 * 32 * ## Notes 33 * 34 * - The method does **not** serialize data outside of the buffer region defined by the array configuration. 35 * 36 * @private 37 * @returns {Object} JSON representation 38 */ 39 function toJSON() { 40 /* eslint-disable no-invalid-this */ 41 var out; 42 var len; 43 var v; 44 var i; 45 46 len = this._length; 47 48 // Build an object containing all ndarray properties needed to revive a serialized ndarray... 49 out = {}; 50 out.type = 'ndarray'; 51 out.dtype = this.dtype; 52 out.flags = {}; // TODO: reserved for future use 53 out.order = this._order; 54 out.shape = this._shape.slice(); 55 out.strides = this._strides.slice(); 56 57 // Flip the signs of negative strides: 58 for ( i = 0; i < len; i++ ) { 59 if ( out.strides[ i ] < 0 ) { 60 out.strides[ i ] *= -1; 61 } 62 } 63 // Cast data to generic array... 64 out.data = []; 65 if ( out.dtype === 'complex64' || out.dtype === 'complex128' ) { 66 for ( i = 0; i < len; i++ ) { 67 v = this.iget( i ); 68 out.data.push( real( v ), imag( v ) ); 69 } 70 } else { 71 for ( i = 0; i < len; i++ ) { 72 out.data.push( this.iget( i ) ); 73 } 74 } 75 return out; 76 77 /* eslint-enable no-invalid-this */ 78 } 79 80 81 // EXPORTS // 82 83 module.exports = toJSON;