105 lines
2.5 KiB
JavaScript
105 lines
2.5 KiB
JavaScript
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/**
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* @license Apache-2.0
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*
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* Copyright (c) 2018 The Stdlib Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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// MODULES //
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var isString = require( '@stdlib/assert/is-string' ).isPrimitive;
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var isObject = require( '@stdlib/assert/is-plain-object' );
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var isArray = require( '@stdlib/assert/is-array' );
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var contains = require( '@stdlib/assert/contains' );
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var Int32Array = require( '@stdlib/array/int32' );
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var Uint32Array = require( '@stdlib/array/uint32' );
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var table = require( './prngs.js' );
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// VARIABLES //
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var TYPED_ARRAY_CTORS = {
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'Int32Array': Int32Array,
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'Uint32Array': Uint32Array
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};
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var PRNG_WRAPPERS = [ 'randi', 'randn', 'randu' ];
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// MAIN //
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/**
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* Revives a JSON-serialized pseudorandom number generator.
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*
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* @param {string} key - key
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* @param {*} value - value
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* @returns {(*|Function)} value or PRNG
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*
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* @example
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* var parseJSON = require( '@stdlib/utils/parse-json' );
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* var mt19937 = require( '@stdlib/random/base/mt19937' );
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*
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* var str = JSON.stringify( mt19937 );
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* var rand = parseJSON( str, reviver );
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* // returns <Function>
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*/
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function reviver( key, value ) {
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var factory;
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var opts;
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var args;
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var ctor;
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var tmp;
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if (
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value &&
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value.type === 'PRNG' &&
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isString( value.name ) &&
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isObject( value.state ) &&
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isArray( value.params ) &&
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isString( value.state.type ) &&
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isArray( value.state.data )
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) {
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opts = {};
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factory = table[ value.name ];
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if ( factory === void 0 ) {
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tmp = value.name.split( '-' );
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if ( contains( PRNG_WRAPPERS, tmp[ 0 ] ) ) {
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factory = table[ tmp[ 0 ] ];
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opts.name = tmp.slice( 1 ).join( '-' );
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}
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}
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if ( factory ) {
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ctor = TYPED_ARRAY_CTORS[ value.state.type ];
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if ( ctor ) {
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opts.state = new ctor( value.state.data );
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args = value.params.slice();
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args.push( opts );
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try {
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return factory.apply( null, args );
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} catch ( error ) { // eslint-disable-line no-unused-vars
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// Return the original JSON value...
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}
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}
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}
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}
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return value;
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}
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// EXPORTS //
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module.exports = reviver;
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