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* @license Apache-2.0
*
* Copyright (c) 2024 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 isString = require( '@stdlib/assert/is-string' ).isPrimitive;
var isNonNegativeInteger = require( '@stdlib/assert/is-nonnegative-integer' ).isPrimitive;
var isComplexDataType = require( '@stdlib/array/base/assert/is-complex-floating-point-data-type' );
var isBooleanDataType = require( '@stdlib/array/base/assert/is-boolean-data-type' );
var isCollection = require( '@stdlib/assert/is-collection' );
var isArrayBuffer = require( '@stdlib/assert/is-arraybuffer' );
var isObject = require( '@stdlib/assert/is-object' );
var isFunction = require( '@stdlib/assert/is-function' );
var ctors = require( '@stdlib/array/ctors' );
var gfillBy = require( '@stdlib/blas/ext/base/gfill-by' );
var filledArray = require( '@stdlib/array/base/filled-by' );
var hasIteratorSymbolSupport = require( '@stdlib/assert/has-iterator-symbol-support' );
var ITERATOR_SYMBOL = require( '@stdlib/symbol/iterator' );
var iterLength = require( '@stdlib/iter/length' );
var defaults = require( '@stdlib/array/defaults' );
var format = require( '@stdlib/string/format' );
// VARIABLES //
var HAS_ITERATOR_SYMBOL = hasIteratorSymbolSupport();
var DEFAULT_DTYPE = defaults.get( 'dtypes.default' );
// FUNCTIONS //
/**
* Creates a filled "generic" array from an iterator.
*
* @private
* @param {Iterable} it - iterator
* @param {Callback} clbk - callback function
* @param {*} thisArg - callback function execution context
* @returns {Array} filled array
*/
function filledArrayIterator( it, clbk, thisArg ) {
var arr;
var i;
var v;
arr = [];
i = -1;
while ( true ) {
v = it.next();
if ( v.done ) {
break;
}
i += 1;
arr.push( clbk.call( thisArg, i ) );
}
return arr;
}
/**
* Fills an array exposing accessors for getting and setting array elements.
*
* @private
* @param {Collection} arr - input array
* @param {Callback} clbk - callback function
* @param {*} thisArg - callback function execution context
* @returns {Collection} input array
*/
function filledAccessors( arr, clbk, thisArg ) {
var i;
for ( i = 0; i < arr.length; i++ ) {
arr.set( clbk.call( thisArg, i ), i );
}
return arr;
}
// MAIN //
/**
* Creates a filled array according to a provided callback function.
*
* @param {(NonNegativeInteger|TypedArray|ArrayLikeObject|ArrayBuffer|Iterable)} [arg] - a length, typed array, array-like object, buffer, or iterable
* @param {NonNegativeInteger} [byteOffset=0] - byte offset
* @param {NonNegativeInteger} [length] - view length
* @param {string} [dtype="float64"] - data type
* @param {Callback} [clbk] - callback to invoke
* @param {*} [thisArg] - callback execution context
* @throws {TypeError} must provide a recognized data type
* @throws {TypeError} must provide a length, typed array, array-like object, buffer, or iterable
* @throws {TypeError} callback argument must be a function.
* @throws {Error} creating a generic array from an `ArrayBuffer` is not supported
* @returns {(TypedArray|Array)} array or typed array
*
* @example
* var arr = filledarrayBy();
* // returns <Float64Array>
*
* @example
* function clbk() {
* return 1.0;
* }
*
* var arr = filledarrayBy( 2, clbk );
* // returns <Float64Array>[ 1.0, 1.0 ]
*
* @example
* function clbk() {
* return 1.0;
* }
*
* var arr = filledarrayBy( 2, 'float32', clbk );
* // returns <Float32Array>[ 1.0, 1.0 ]
*
* @example
* function clbk() {
* return 1.0;
* }
*
* var arr = filledarrayBy( 2, 'generic', clbk );
* // returns [ 1.0, 1.0 ]
*
* @example
* function clbk() {
* return 1.0;
* }
*
* var arr = filledarrayBy( [ 0.5, 0.5 ], clbk );
* // returns <Float64Array>[ 1.0, 1.0 ]
*
* @example
* function clbk() {
* return 1;
* }
*
* var arr = filledarrayBy( [ 5, -3 ], 'int32', clbk );
* // returns <Int32Array>[ 1, 1 ]
*
* @example
* function clbk1() {
* return 10;
* }
*
* function clbk2() {
* return 1.0;
* }
*
* var arr1 = filledarrayBy( [ 5, 3 ], 'int32', clbk1 );
* var arr2 = filledarrayBy( arr1, clbk2 );
* // returns <Float64Array>[ 1.0, 1.0 ]
*
* @example
* function clbk1() {
* return 1.0;
* }
*
* function clbk2() {
* return 2;
* }
*
* var arr1 = filledarrayBy( [ 5, 3 ], 'int32', clbk1 );
* var arr2 = filledarrayBy( arr1, 'uint32', clbk2 );
* // returns <Uint32Array>[ 2, 2 ]
*
* @example
* var ArrayBuffer = require( '@stdlib/array/buffer' );
*
* function clbk() {
* return 1.0;
* }
*
* var buf = new ArrayBuffer( 16 );
* var arr = filledarrayBy( buf, clbk );
* // returns <Float64Array>[ 1.0, 1.0 ]
*
* @example
* var ArrayBuffer = require( '@stdlib/array/buffer' );
*
* function clbk() {
* return 1.0;
* }
*
* var buf = new ArrayBuffer( 16 );
* var arr = filledarrayBy( buf, 'float32', clbk );
* // returns <Float32Array>[ 1.0, 1.0, 1.0, 1.0 ]
*
* @example
* var ArrayBuffer = require( '@stdlib/array/buffer' );
*
* function clbk() {
* return 1.0;
* }
*
* var buf = new ArrayBuffer( 16 );
* var arr = filledarrayBy( buf, 8, clbk );
* // returns <Float64Array>[ 1.0 ]
*
* @example
* var ArrayBuffer = require( '@stdlib/array/buffer' );
*
* function clbk() {
* return 1.0;
* }
*
* var buf = new ArrayBuffer( 16 );
* var arr = filledarrayBy( buf, 8, 'float32', clbk );
* // returns <Float32Array>[ 1.0, 1.0 ]
*
* @example
* var ArrayBuffer = require( '@stdlib/array/buffer' );
*
* function clbk() {
* return 1.0;
* }
*
* var buf = new ArrayBuffer( 32 );
* var arr = filledarrayBy( buf, 8, 2, clbk );
* // returns <Float64Array>[ 1.0, 1.0 ]
*
* @example
* var ArrayBuffer = require( '@stdlib/array/buffer' );
*
* function clbk() {
* return 1;
* }
*
* var buf = new ArrayBuffer( 32 );
* var arr = filledarrayBy( buf, 8, 2, 'int32', clbk );
* // returns <Int32Array>[ 1, 1 ]
*/
function filledarrayBy() {
var thisArg;
var nargs;
var dtype;
var clbk;
var ctor;
var arr;
var len;
var arg;
nargs = arguments.length;
// If we weren't provided any arguments, return an empty array...
if ( nargs === 0 ) {
ctor = ctors( DEFAULT_DTYPE );
return new ctor( 0 );
}
// Check if we were provided a dtype as the first argument...
dtype = arguments[ 0 ];
if ( isString( dtype ) ) {
// Invoking this function with arguments `f( dtype, clbk[, thisArg] )` is not allowed (otherwise, we'd need to also allow `f( clbk[, thisArg] )`)...
if ( nargs > 1 ) {
throw new TypeError( 'invalid arguments. Must provide a length, typed array, array-like object, or an iterable.' );
}
ctor = ctors( dtype );
if ( ctor === null ) {
throw new TypeError( format( 'invalid argument. Must provide a recognized data type. Value: `%s`.', dtype ) );
}
// Return an empty array having the specified dtype:
return new ctor( 0 );
}
// For all other supported invocations, we need at least two arguments...
if ( nargs < 2 ) {
throw new TypeError( 'invalid arguments. Must provide a length, typed array, array-like object, or an iterable.' );
}
// At this point, we need to do some argument juggling...
nargs -= 1; // henceforth, the number of available arguments is `nargs+1`
// Determine whether the last argument is a callback or "this" context...
if ( isFunction( arguments[ nargs ] ) ) {
// If the last argument is a function, we need to check the next-to-last argument, and, if the next-to-last argument is a function, assume that the next-to-last argument is the callback and the last argument is a "this" context...
if ( isFunction( arguments[ nargs-1 ] ) ) {
thisArg = arguments[ nargs ];
nargs -= 1;
clbk = arguments[ nargs ];
// Check if we were provided only a callback and a "this" context..
if ( nargs === 0 ) {
throw new TypeError( 'invalid arguments. Must provide a length, typed array, array-like object, or an iterable.' );
}
} else {
// "this" context is left undefined...
clbk = arguments[ nargs ];
}
}
// If we were provided 3 or more arguments and the last argument was not a function, assume that we were provided a callback and a "this" context...
else if ( nargs >= 2 ) {
thisArg = arguments[ nargs ];
nargs -= 1;
clbk = arguments[ nargs ];
if ( !isFunction( clbk ) ) {
throw new TypeError( format( 'invalid argument. Callback argument must be a function. Value: `%s`.', clbk ) );
}
}
// If were were only provided 2 arguments and the last argument was not a function, we've been provided an insufficient number of arguments...
else {
throw new TypeError( 'invalid arguments. Must provide a length, typed array, array-like object, or an iterable.' );
}
// Now that we've processed the callback arguments, let's continue working backward to see if we've been provided a `dtype` argument...
nargs -= 1;
if ( nargs >= 0 && isString( arguments[ nargs ] ) ) {
dtype = arguments[ nargs ];
nargs -= 1;
} else {
dtype = DEFAULT_DTYPE;
}
ctor = ctors( dtype );
if ( ctor === null ) {
throw new TypeError( format( 'invalid argument. Must provide a recognized data type. Value: `%s`.', dtype ) );
}
// At this point, we've resolved the output array data type, and now we can actually create the output array...
if ( dtype === 'generic' ) {
arg = arguments[ 0 ];
if ( nargs === 0 ) {
if ( isNonNegativeInteger( arg ) ) {
len = arg;
} else if ( isCollection( arg ) ) {
len = arg.length;
}
if ( len !== void 0 ) {
return filledArray( len, clbk, thisArg );
}
if ( isArrayBuffer( arg ) ) {
throw new Error( 'invalid arguments. Creating a generic array from an ArrayBuffer is not supported.' );
}
if ( isObject( arg ) ) {
if ( HAS_ITERATOR_SYMBOL === false ) {
throw new TypeError( format( 'invalid argument. Environment lacks Symbol.iterator support. Must provide a length, typed array, or array-like object. Value: `%s`.', arg ) );
}
if ( !isFunction( arg[ ITERATOR_SYMBOL ] ) ) {
throw new TypeError( format( 'invalid argument. Must provide a length, typed array, array-like object, or an iterable. Value: `%s`.', arg ) );
}
arg = arg[ ITERATOR_SYMBOL ]();
if ( !isFunction( arg.next ) ) {
throw new TypeError( format( 'invalid argument. Must provide a length, typed array, array-like object, or an iterable. Value: `%s`.', arg ) );
}
return filledArrayIterator( arg, clbk, thisArg );
}
throw new TypeError( format( 'invalid argument. Must provide a length, typed array, array-like object, or an iterable. Value: `%s`.', arg ) );
} else if ( isArrayBuffer( arg ) ) {
throw new Error( 'invalid arguments. Creating a generic array from an ArrayBuffer is not supported.' );
}
throw new TypeError( format( 'invalid argument. Must provide a length, typed array, array-like object, or an iterable. Value: `%s`.', arg ) );
}
if ( nargs === 0 ) { // length || array-like || ArrayBuffer || iterable
arg = arguments[ 0 ];
if ( isCollection( arg ) ) {
arr = new ctor( arg.length );
} else if ( isArrayBuffer( arg ) ) {
arr = new ctor( arg );
} else if ( isNonNegativeInteger( arg ) ) {
arr = new ctor( arg );
} else if ( isObject( arg ) ) {
if ( HAS_ITERATOR_SYMBOL === false ) {
throw new TypeError( format( 'invalid argument. Environment lacks Symbol.iterator support. Must provide a length, typed array, or array-like object. Value: `%s`.', arg ) );
}
if ( !isFunction( arg[ ITERATOR_SYMBOL ] ) ) {
throw new TypeError( format( 'invalid argument. Must provide a length, typed array, array-like object, or an iterable. Value: `%s`.', arg ) );
}
arg = arg[ ITERATOR_SYMBOL ]();
if ( !isFunction( arg.next ) ) {
throw new TypeError( format( 'invalid argument. Must provide a length, typed array, array-like object, or an iterable. Value: `%s`.', arg ) );
}
arr = new ctor( iterLength( arg ) );
} else {
throw new TypeError( format( 'invalid argument. Must provide a length, typed array, array-like object, or an iterable. Value: `%s`.', arg ) );
}
} else if ( nargs === 1 ) {
arr = new ctor( arguments[0], arguments[1] ); // (ArrayBuffer, byteOffset)
} else {
arr = new ctor( arguments[0], arguments[1], arguments[2] ); // (ArrayBuffer, byteOffset, length)
}
if ( arr.length > 0 ) {
if ( isComplexDataType( dtype ) || isBooleanDataType( dtype ) ) {
filledAccessors( arr, clbk, thisArg );
} else {
gfillBy( arr.length, arr, 1, callback );
}
}
return arr;
/**
* Callback which wraps a provided callback and is invoked for each array element.
*
* @private
* @param {*} value - element value
* @param {NonNegativeInteger} aidx - array index
* @param {NonNegativeInteger} sidx - strided index
* @param {Collection} array - input array/collection
* @returns {*} callback return value
*/
function callback( value, aidx ) {
return clbk.call( thisArg, aidx );
}
}
// EXPORTS //
module.exports = filledarrayBy;
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