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* @license Apache-2.0
*
* Copyright (c) 2018 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
// MODULES //
var setReadOnly = require( '@stdlib/utils/define-nonenumerable-read-only-property' );
var setReadOnlyAccessor = require( '@stdlib/utils/define-nonenumerable-read-only-accessor' );
var setReadWriteAccessor = require( '@stdlib/utils/define-nonenumerable-read-write-accessor' );
var isObject = require( '@stdlib/assert/is-plain-object' );
var isBoolean = require( '@stdlib/assert/is-boolean' ).isPrimitive;
var hasOwnProp = require( '@stdlib/assert/has-own-property' );
var typedarray2json = require( '@stdlib/array/to-json' );
var format = require( '@stdlib/string/format' );
var defaults = require( './defaults.json' );
var PRNGS = require( './prngs.js' );
// MAIN //
/**
* Returns a pseudorandom number generator for generating random numbers having integer values.
*
* @param {Options} [options] - function options
* @param {string} [options.name='mt19937'] - name of pseudorandom number generator
* @param {*} [options.seed] - pseudorandom number generator seed
* @param {*} [options.state] - pseudorandom number generator state
* @param {boolean} [options.copy=true] - boolean indicating whether to copy a provided pseudorandom number generator state
* @throws {TypeError} must provide an object
* @throws {TypeError} must provide valid options
* @throws {Error} must provide the name of a supported pseudorandom number generator
* @returns {PRNG} pseudorandom number generator
*
* @example
* var randi = factory();
* var v = randi();
* // returns <number>
*
* @example
* var randi = factory({
* 'name': 'minstd'
* });
* var v = randi();
* // returns <number>
*
* @example
* var randi = factory({
* 'seed': 12345
* });
* var v = randi();
* // returns <number>
*
* @example
* var randi = factory({
* 'name': 'minstd',
* 'seed': 12345
* });
* var v = randi();
* // returns <number>
*/
function factory( options ) {
var opts;
var rand;
var prng;
opts = {
'name': defaults.name,
'copy': defaults.copy
};
if ( arguments.length ) {
if ( !isObject( options ) ) {
throw new TypeError( format( 'invalid argument. Must provide an object. Value: `%s`.', options ) );
}
if ( hasOwnProp( options, 'name' ) ) {
opts.name = options.name;
}
if ( hasOwnProp( options, 'state' ) ) {
opts.state = options.state;
if ( opts.state === void 0 ) {
throw new TypeError( format( 'invalid option. `%s` option cannot be undefined. Option: `%s`.', 'state', opts.state ) );
}
} else if ( hasOwnProp( options, 'seed' ) ) {
opts.seed = options.seed;
if ( opts.seed === void 0 ) {
throw new TypeError( format( 'invalid option. `%s` option cannot be undefined. Option: `%s`.', 'seed', opts.seed ) );
}
}
if ( hasOwnProp( options, 'copy' ) ) {
opts.copy = options.copy;
if ( !isBoolean( opts.copy ) ) {
throw new TypeError( format( 'invalid option. `%s` option must be a boolean. Option: `%s`.', 'copy', opts.copy ) );
}
}
}
prng = PRNGS[ opts.name ];
if ( prng === void 0 ) {
throw new Error( format( 'invalid option. Unrecognized/unsupported PRNG. Option: `%s`.', opts.name ) );
}
if ( opts.state === void 0 ) {
if ( opts.seed === void 0 ) {
rand = prng.factory();
} else {
rand = prng.factory({
'seed': opts.seed
});
}
} else {
rand = prng.factory({
'state': opts.state,
'copy': opts.copy
});
}
setReadOnly( randi, 'NAME', 'randi' );
setReadOnlyAccessor( randi, 'seed', getSeed );
setReadOnlyAccessor( randi, 'seedLength', getSeedLength );
setReadWriteAccessor( randi, 'state', getState, setState );
setReadOnlyAccessor( randi, 'stateLength', getStateLength );
setReadOnlyAccessor( randi, 'byteLength', getStateSize );
setReadOnly( randi, 'toJSON', toJSON );
setReadOnly( randi, 'PRNG', rand );
setReadOnly( randi, 'MIN', rand.MIN );
setReadOnly( randi, 'MAX', rand.MAX );
return randi;
/**
* Returns the PRNG seed.
*
* @private
* @returns {*} seed
*/
function getSeed() {
return rand.seed;
}
/**
* Returns the PRNG seed length.
*
* @private
* @returns {PositiveInteger} seed length
*/
function getSeedLength() {
return rand.seedLength;
}
/**
* Returns the PRNG state length.
*
* @private
* @returns {PositiveInteger} state length
*/
function getStateLength() {
return rand.stateLength;
}
/**
* Returns the PRNG state size (in bytes).
*
* @private
* @returns {PositiveInteger} state size (in bytes)
*/
function getStateSize() {
return rand.byteLength;
}
/**
* Returns the current pseudorandom number generator state.
*
* @private
* @returns {*} current state
*/
function getState() {
return rand.state;
}
/**
* Sets the pseudorandom number generator state.
*
* @private
* @param {*} s - generator state
* @throws {Error} must provide a valid state
*/
function setState( s ) {
rand.state = s;
}
/**
* Serializes the pseudorandom number generator as a JSON object.
*
* ## Notes
*
* - `JSON.stringify()` implicitly calls this method when stringifying a PRNG.
*
* @private
* @returns {Object} JSON representation
*/
function toJSON() {
var out = {};
out.type = 'PRNG';
out.name = randi.NAME + '-' + rand.NAME;
out.state = typedarray2json( rand.state );
out.params = [];
return out;
}
/**
* Returns a pseudorandom number having an integer value.
*
* @private
* @returns {integer} pseudorandom number
*
* @example
* var v = randi();
* // returns <number>
*/
function randi() {
return rand();
}
}
// EXPORTS //
module.exports = factory;
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