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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 isFunction = require( '@stdlib/assert/is-function' );
var isCollection = require( '@stdlib/assert/is-collection' );
var isIteratorLike = require( '@stdlib/assert/is-iterator-like' );
var isAccessorArray = require( '@stdlib/array/base/assert/is-accessor-array' );
var accessorSetter = require( '@stdlib/array/base/accessor-setter' );
var setter = require( '@stdlib/array/base/setter' );
var dtype = require( '@stdlib/array/dtype' );
var format = require( '@stdlib/string/format' );
// MAIN //
/**
* Creates (or fills) an array from an iterator.
*
* @param {Iterator} iterator - source iterator
* @param {Collection} [out] - output array
* @param {Function} [mapFcn] - function to invoke for each iterated value
* @param {*} [thisArg] - execution context
* @throws {TypeError} iterator argument must be an iterator
* @throws {TypeError} callback argument must be a function
* @returns {Collection} output array
*
* @example
* var randu = require( '@stdlib/random/iter/randu' );
*
* var iter = randu({
* 'iter': 10
* });
*
* var arr = iterator2array( iter );
* // returns <Array>
*/
function iterator2array() {
var iterator;
var thisArg;
var fcn;
var out;
var len;
var set;
var dt;
var i;
var v;
iterator = arguments[ 0 ];
if ( arguments.length > 1 ) {
if ( isCollection( arguments[ 1 ] ) ) {
out = arguments[ 1 ];
if ( arguments.length > 2 ) {
fcn = arguments[ 2 ];
if ( !isFunction( fcn ) ) {
throw new TypeError( format( 'invalid argument. Callback argument must be a function. Value: `%s`.', fcn ) );
}
thisArg = arguments[ 3 ];
}
} else {
fcn = arguments[ 1 ];
if ( !isFunction( fcn ) ) {
throw new TypeError( format( 'invalid argument. Callback argument must be a function. Value: `%s`.', fcn ) );
}
thisArg = arguments[ 2 ];
}
}
if ( !isIteratorLike( iterator ) ) {
throw new TypeError( format( 'invalid argument. Iterator argument must be an iterator protocol-compliant object. Value: `%s`.', iterator ) );
}
i = -1;
if ( out === void 0 ) {
out = [];
if ( fcn ) {
while ( true ) {
i += 1;
v = iterator.next();
if ( v.done ) {
break;
}
out.push( fcn.call( thisArg, v.value, i ) );
}
return out;
}
while ( true ) {
v = iterator.next();
if ( v.done ) {
break;
}
out.push( v.value );
}
return out;
}
len = out.length;
dt = dtype( out );
if ( isAccessorArray( out ) ) {
set = accessorSetter( dt );
} else {
set = setter( dt );
}
if ( fcn ) {
while ( i < len-1 ) {
i += 1;
v = iterator.next();
if ( v.done ) {
break;
}
set( out, i, fcn.call( thisArg, v.value, i ) );
}
return out;
}
while ( i < len-1 ) {
i += 1;
v = iterator.next();
if ( v.done ) {
break;
}
set( out, i, v.value );
}
return out;
}
// EXPORTS //
module.exports = iterator2array;
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