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* @license Apache-2.0
*
* Copyright (c) 2019 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 isFunction = require( '@stdlib/assert/is-function' );
var isNumber = require( '@stdlib/assert/is-number' ).isPrimitive;
var isIteratorLike = require( '@stdlib/assert/is-iterator-like' );
var iteratorSymbol = require( '@stdlib/symbol/iterator' );
var format = require( '@stdlib/string/format' );
// MAIN //
/**
* Returns an iterator which performs element-wise subtraction of two or more iterators.
*
* ## Notes
*
* - If provided a numeric value as an iterator argument, the value is broadcast as an **infinite** iterator which **always** returns the provided value.
* - If an iterated value is non-numeric (including `NaN`), the returned iterator returns `NaN`. If non-numeric iterated values are possible, you are advised to provide an iterator which type checks and handles non-numeric values accordingly.
* - The length of the returned iterator is equal to the length of the shortest provided iterator. In other words, the returned iterator ends once **one** of the provided iterators ends.
* - If an environment supports `Symbol.iterator` and all provided iterators are iterable, the returned iterator is iterable.
*
* @param {Iterator} iter0 - first input iterator
* @param {...(Iterator|number)} iterator - subsequent iterators
* @throws {Error} must provide two or more iterators
* @throws {TypeError} must provide iterator protocol-compliant objects
* @returns {Iterator} iterator
*
* @example
* var array2iterator = require( '@stdlib/array/to-iterator' );
*
* var it1 = array2iterator( [ 1.0, 5.0 ] );
* var it2 = array2iterator( [ 3.0, 4.0 ] );
*
* var iter = iterSubtract( it1, it2 );
*
* var v = iter.next().value;
* // returns -2.0
*
* v = iter.next().value;
* // returns 1.0
*
* var bool = iter.next().done;
* // returns true
*/
function iterSubtract() {
var iterators;
var types;
var niter;
var iter;
var FLG;
var i;
niter = arguments.length;
if ( niter < 2 ) {
throw new Error( 'insufficient arguments. Must provide two or more iterators.' );
}
iterators = [];
types = [];
for ( i = 0; i < niter; i++ ) {
iterators.push( arguments[ i ] );
if ( isIteratorLike( arguments[ i ] ) ) {
types.push( 1 );
} else if ( isNumber( arguments[ i ] ) ) {
types.push( 0 );
} else {
throw new TypeError( format( 'invalid argument. Must provide an iterator protocol-compliant object or a number. Argument: `%u`. Value: `%s`.', i, arguments[ i ] ) );
}
}
// Create an iterator protocol-compliant object:
iter = {};
setReadOnly( iter, 'next', next );
setReadOnly( iter, 'return', end );
// If an environment supports `Symbol.iterator` and all provided iterators are iterable, make the iterator iterable:
if ( iteratorSymbol ) {
for ( i = 0; i < niter; i++ ) {
if ( types[ i ] && !isFunction( iterators[ i ][ iteratorSymbol ] ) ) { // eslint-disable-line max-len
FLG = true;
break;
}
}
if ( !FLG ) {
setReadOnly( iter, iteratorSymbol, factory );
}
}
FLG = false;
i = 0;
return iter;
/**
* Returns an iterator protocol-compliant object containing the next iterated value.
*
* @private
* @returns {Object} iterator protocol-compliant object
*/
function next() {
var s;
var v;
var i;
if ( FLG ) {
return {
'done': true
};
}
if ( types[ 0 ] ) {
v = iterators[ 0 ].next();
if ( v.done ) {
FLG = true;
return v;
}
if ( typeof v.value === 'number' ) {
s = v.value;
} else {
s = NaN;
}
} else {
s = iterators[ 0 ];
}
for ( i = 1; i < niter; i++ ) {
if ( types[ i ] ) {
v = iterators[ i ].next();
if ( v.done ) {
FLG = true;
return v;
}
if ( typeof v.value === 'number' ) {
s -= v.value;
} else {
s = NaN;
}
} else {
s -= iterators[ i ];
}
}
return {
'value': s,
'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() {
var args;
var i;
args = [];
for ( i = 0; i < niter; i++ ) {
if ( types[ i ] ) {
args.push( iterators[ i ][ iteratorSymbol ]() );
} else {
args.push( iterators[ i ] );
}
}
return iterSubtract.apply( null, args );
}
}
// EXPORTS //
module.exports = iterSubtract;
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