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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 hasOwnProp = require( '@stdlib/assert/has-own-property' );
var isFunction = require( '@stdlib/assert/is-function' );
var isCollection = require( '@stdlib/assert/is-collection' );
var isObject = require( '@stdlib/assert/is-plain-object' );
var isNonNegativeInteger = require( '@stdlib/assert/is-nonnegative-integer' ).isPrimitive;
var isAccessorArray = require( '@stdlib/array/base/assert/is-accessor-array' );
var iteratorSymbol = require( '@stdlib/symbol/iterator' );
var accessorGetter = require( '@stdlib/array/base/accessor-getter' );
var getter = require( '@stdlib/array/base/getter' );
var dtype = require( '@stdlib/array/dtype' );
var format = require( '@stdlib/string/format' );
// MAIN //
/**
* Returns an iterator which repeatedly iterates over each element in an array-like object.
*
* @param {Collection} src - input value
* @param {Options} [options] - function options
* @param {NonNegativeInteger} [options.iter] - number of iterations
* @param {integer} [options.dir=1] - iteration direction
* @param {Function} [mapFcn] - function to invoke for each iterated value
* @param {*} [thisArg] - execution context
* @throws {TypeError} first argument must be an array-like object
* @throws {TypeError} options argument must be an object
* @throws {TypeError} must provide valid options
* @throws {TypeError} callback argument must be a function
* @returns {Iterator} iterator
*
* @example
* var iter = circarray2iterator( [ 1, 2, 3, 4 ] );
*
* var v = iter.next().value;
* // returns 1
*
* v = iter.next().value;
* // returns 2
*
* v = iter.next().value;
* // returns 3
*
* // ...
*/
function circarray2iterator( src ) {
var thisArg;
var options;
var count;
var opts;
var iter;
var FLG;
var fcn;
var get;
var dt;
var i;
if ( !isCollection( src ) ) {
throw new TypeError( format( 'invalid argument. First argument must be an array-like object. Value: `%s`.', src ) );
}
opts = {
'iter': 1e308, // ~infinity
'dir': 1 // left to right iteration
};
if ( arguments.length > 1 ) {
if ( isObject( arguments[ 1 ] ) ) {
options = 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 ];
}
if ( hasOwnProp( options, 'iter' ) ) {
opts.iter = options.iter;
if ( !isNonNegativeInteger( options.iter ) ) {
throw new TypeError( format( 'invalid option. `%s` option must be a nonnegative integer. Option: `%s`.', 'iter', options.iter ) );
}
}
if ( hasOwnProp( options, 'dir' ) ) {
opts.dir = options.dir;
if ( options.dir !== 1 && options.dir !== -1 ) {
throw new TypeError( format( 'invalid option. `%s` option must be either `1` or `-1`. Option: `%s`.', 'dir', options.dir ) );
}
}
} else {
fcn = arguments[ 1 ];
if ( !isFunction( fcn ) ) {
throw new TypeError( format( 'invalid argument. Second argument must be either a function or an options object. Value: `%s`.', fcn ) );
}
thisArg = arguments[ 2 ];
}
}
count = 0;
// Create an iterator protocol-compliant object:
iter = {};
if ( fcn ) {
if ( opts.dir === 1 ) {
i = -1;
setReadOnly( iter, 'next', next1a );
} else {
i = src.length;
setReadOnly( iter, 'next', next1b );
}
} else if ( opts.dir === 1 ) {
i = -1;
setReadOnly( iter, 'next', next2a );
} else {
i = src.length;
setReadOnly( iter, 'next', next2b );
}
setReadOnly( iter, 'return', end );
// If an environment supports `Symbol.iterator`, make the iterator iterable:
if ( iteratorSymbol ) {
setReadOnly( iter, iteratorSymbol, factory );
}
// Resolve an accessor for retrieving array elements (e.g., to accommodate `Complex64Array`, etc):
dt = dtype( src );
if ( isAccessorArray( src ) ) {
get = accessorGetter( dt );
} else {
get = getter( dt );
}
return iter;
/**
* Returns an iterator protocol-compliant object containing the next iterated value.
*
* @private
* @returns {Object} iterator protocol-compliant object
*/
function next1a() {
i = (i+1) % src.length;
count += 1;
if ( FLG || count > opts.iter || src.length === 0 ) {
return {
'done': true
};
}
return {
'value': fcn.call( thisArg, get( src, i ), i, count, src ),
'done': false
};
}
/**
* Returns an iterator protocol-compliant object containing the next iterated value.
*
* @private
* @returns {Object} iterator protocol-compliant object
*/
function next1b() {
i -= 1;
if ( i < 0 ) {
i += src.length;
}
count += 1;
if ( FLG || count > opts.iter || src.length === 0 ) {
return {
'done': true
};
}
return {
'value': fcn.call( thisArg, get( src, i ), i, count, src ),
'done': false
};
}
/**
* Returns an iterator protocol-compliant object containing the next iterated value.
*
* @private
* @returns {Object} iterator protocol-compliant object
*/
function next2a() {
i = (i+1) % src.length;
count += 1;
if ( FLG || count > opts.iter || src.length === 0 ) {
return {
'done': true
};
}
return {
'value': get( src, i ),
'done': false
};
}
/**
* Returns an iterator protocol-compliant object containing the next iterated value.
*
* @private
* @returns {Object} iterator protocol-compliant object
*/
function next2b() {
i -= 1;
if ( i < 0 ) {
i += src.length;
}
count += 1;
if ( FLG || count > opts.iter || src.length === 0 ) {
return {
'done': true
};
}
return {
'value': get( src, i ),
'done': false
};
}
/**
* Finishes an iterator.
*
* @private
* @param {*} [value] - value to return
* @returns {Object} iterator protocol-compliant object
*/
function end( value ) {
FLG = true;
if ( arguments.length ) {
return {
'value': value,
'done': true
};
}
return {
'done': true
};
}
/**
* Returns a new iterator.
*
* @private
* @returns {Iterator} iterator
*/
function factory() {
if ( fcn ) {
return circarray2iterator( src, opts, fcn, thisArg );
}
return circarray2iterator( src, opts );
}
}
// EXPORTS //
module.exports = circarray2iterator;
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