text: /**
  * @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 isFunction = require( '@stdlib/assert/is-function' );
  var hasOwnProp = require( '@stdlib/assert/has-own-property' );
  var constantFunction = require( '@stdlib/utils/constant-function' );
  var noop = require( '@stdlib/utils/noop' );
  var isnan = require( '@stdlib/math/base/assert/is-nan' );
  var isPositiveInteger = require( '@stdlib/math/base/assert/is-positive-integer' );
  var isProbability = require( '@stdlib/math/base/assert/is-probability' );
  var randu = require( '@stdlib/random/base/mt19937' ).factory;
  var typedarray2json = require( '@stdlib/array/to-json' );
  var validate = require( './validate.js' );
  var binomial0 = require( './binomial.js' );
  
  
  // MAIN //
  
  /**
  * Returns a pseudorandom number generator for generating binomially distributed random numbers.
  *
  * @param {PositiveInteger} [n] - number of trials
  * @param {Probability} [p] - success probability
  * @param {Options} [options] - function options
  * @param {PRNG} [options.prng] - pseudorandom number generator which generates uniformly distributed pseudorandom numbers
  * @param {PRNGSeedMT19937} [options.seed] - pseudorandom number generator seed
  * @param {PRNGStateMT19937} [options.state] - pseudorandom number generator state
  * @param {boolean} [options.copy=true] - boolean indicating whether to copy a provided pseudorandom number generator state
  * @throws {TypeError} `n` must be a positive integer
  * @throws {TypeError} `p` must be a probability
  * @throws {TypeError} options argument must be an object
  * @throws {TypeError} must provide valid options
  * @throws {Error} must provide a valid state
  * @returns {PRNG} pseudorandom number generator
  *
  * @example
  * var binomial = factory( 17, 0.5 );
  * var v = binomial();
  * // returns <number>
  *
  * @example
  * var binomial = factory( 8, 0.8, {
  *     'seed': 297
  * });
  * var v = binomial();
  * // returns <number>
  *
  * @example
  * var binomial = factory();
  * var v = binomial( 20, 0.5 );
  * // returns <number>
  */
  function factory() {
  	var opts;
  	var rand;
  	var prng;
  	var err;
  	var n;
  	var p;
  
  	if ( arguments.length === 0 ) {
  		rand = randu();
  	} else if ( arguments.length === 1 ) {
  		opts = arguments[ 0 ];
  		if ( !isObject( opts ) ) {
  			throw new TypeError( 'invalid argument. Options argument must be an object. Value: `' + opts + '`.' );
  		}
  		if ( hasOwnProp( opts, 'prng' ) ) {
  			if ( !isFunction( opts.prng ) ) {
  				throw new TypeError( 'invalid option. `prng` option must be a pseudorandom number generator function. Option: `' + opts.prng + '`.' );
  			}
  			rand = opts.prng;
  		} else {
  			rand = randu( opts );
  		}
  	} else {
  		n = arguments[ 0 ];
  		p = arguments[ 1 ];
  		err = validate( n, p );
  		if ( err ) {
  			throw err;
  		}
  		if ( arguments.length > 2 ) {
  			opts = arguments[ 2 ];
  			if ( !isObject( opts ) ) {
  				throw new TypeError( 'invalid argument. Options argument must be an object. Value: `' + opts + '`.' );
  			}
  			if ( hasOwnProp( opts, 'prng' ) ) {
  				if ( !isFunction( opts.prng ) ) {
  					throw new TypeError( 'invalid option. `prng` option must be a pseudorandom number generator function. Option: `' + opts.prng + '`.' );
  				}
  				rand = opts.prng;
  			} else {
  				rand = randu( opts );
  			}
  		} else {
  			rand = randu();
  		}
  	}
  	if ( n === void 0 ) {
  		prng = binomial2;
  	}
  	else {
  		prng = binomial1;
  	}
  	setReadOnly( prng, 'NAME', 'binomial' );
  
  	// If we are provided an "external" PRNG, we don't support getting or setting PRNG state, as we'd need to check for compatible state value types, etc, entailing considerable complexity.
  	if ( opts && opts.prng ) {
  		setReadOnly( prng, 'seed', null );
  		setReadOnly( prng, 'seedLength', null );
  		setReadWriteAccessor( prng, 'state', constantFunction( null ), noop );
  		setReadOnly( prng, 'stateLength', null );
  		setReadOnly( prng, 'byteLength', null );
  		setReadOnly( prng, 'toJSON', constantFunction( null ) );
  		setReadOnly( prng, 'PRNG', rand );
  	} else {
  		setReadOnlyAccessor( prng, 'seed', getSeed );
  		setReadOnlyAccessor( prng, 'seedLength', getSeedLength );
  		setReadWriteAccessor( prng, 'state', getState, setState );
  		setReadOnlyAccessor( prng, 'stateLength', getStateLength );
  		setReadOnlyAccessor( prng, 'byteLength', getStateSize );
  		setReadOnly( prng, 'toJSON', toJSON );
  		setReadOnly( prng, 'PRNG', rand );
  		rand = rand.normalized;
  	}
  	return prng;
  
  	/**
  	* Returns the PRNG seed.
  	*
  	* @private
  	* @returns {PRNGSeedMT19937} 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 {PRNGStateMT19937} current state
  	*/
  	function getState() {
  		return rand.state;
  	}
  
  	/**
  	* Sets the pseudorandom number generator state.
  	*
  	* @private
  	* @param {PRNGStateMT19937} 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 = prng.NAME;
  		out.state = typedarray2json( rand.state );
  		if ( n === void 0 ) {
  			out.params = [];
  		} else {
  			out.params = [ n, p ];
  		}
  		return out;
  	}
  
  	/**
  	* Returns a random number drawn from a binomial distribution with bound parameter values.
  	*
  	* @private
  	* @returns {NonNegativeInteger} pseudorandom number
  	*
  	* @example
  	* var r = binomial1();
  	* // returns <number>
  	*/
  	function binomial1() {
  		return binomial0( rand, n, p );
  	}
  
  	/**
  	* Returns a random number drawn from a binomial distribution.
  	*
  	* @private
  	* @param {PositiveInteger} n - number of trials
  	* @param {Probability} p - success probability
  	* @returns {NonNegativeInteger} pseudorandom number
  	*
  	* @example
  	* var r = binomial2( 20, 0.8 );
  	* // returns <number>
  	*/
  	function binomial2( n, p ) {
  		if (
  			isnan( n ) ||
  			isnan( p ) ||
  			!isPositiveInteger( n ) ||
  			!isProbability( p )
  		) {
  			return NaN;
  		}
  		return binomial0( rand, n, p );
  	}
  }
  
  
  // EXPORTS //
  
  module.exports = factory;
  