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* @license Apache-2.0
*
* Copyright (c) 2023 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.
*/
/* eslint-disable no-restricted-syntax, no-invalid-this */
'use strict';
// MODULES //
var setReadOnly = require( '@stdlib/utils/define-nonenumerable-read-only-property' );
var setReadOnlyAccessor = require( '@stdlib/utils/define-nonenumerable-read-only-accessor' );
var isInteger = require( '@stdlib/assert/is-integer' ).isPrimitive;
var isNull = require( '@stdlib/assert/is-null' );
var isUndefined = require( '@stdlib/assert/is-undefined' );
var isSlice = require( '@stdlib/assert/is-slice' );
var format = require( '@stdlib/string/format' );
// FUNCTIONS //
/**
* Tests whether an input argument is valid.
*
* @private
* @param {*} value - value to test
* @returns {boolean} boolean indicating whether the argument is valid
*
* @example
* var bool = isValid( 3 );
* // returns true
*
* bool = isValid( null );
* // returns true
*
* bool = isValid( void 0 );
* // returns true
*
* bool = isValid( '3' );
* // returns false
*/
function isValid( value ) {
return (
isInteger( value ) ||
isNull( value ) ||
isUndefined( value ) ||
isSlice( value )
);
}
// MAIN //
/**
* Multi-slice constructor.
*
* @constructor
* @param {...(Slice|integer|null)} slice - slice
* @throws {TypeError} a provided argument must be either a Slice, integer, null, or undefined
* @returns {MultiSlice} MultiSlice instance
*
* @example
* var Slice = require( '@stdlib/slice/ctor' );
*
* var s1 = new Slice( 0, 10, 1 );
* var s2 = new Slice( 2, 12, 2 );
*
* var ms = new MultiSlice( null, s1, s2, 2 );
* // returns <MultiSlice>
*/
function MultiSlice() {
var nargs;
var proxy;
var args;
var v;
var i;
nargs = arguments.length;
if ( !( this instanceof MultiSlice ) ) {
if ( nargs === 1 ) {
return new MultiSlice( arguments[ 0 ] );
}
if ( nargs === 2 ) {
return new MultiSlice( arguments[ 0 ], arguments[ 1 ] );
}
if ( nargs === 3 ) {
return new MultiSlice( arguments[ 0 ], arguments[ 1 ], arguments[ 2 ] ); // eslint-disable-line max-len
}
if ( nargs === 4 ) {
return new MultiSlice( arguments[ 0 ], arguments[ 1 ], arguments[ 2 ], arguments[ 3 ] ); // eslint-disable-line max-len
}
if ( nargs === 5 ) {
return new MultiSlice( arguments[ 0 ], arguments[ 1 ], arguments[ 2 ], arguments[ 3 ], arguments[ 4 ] ); // eslint-disable-line max-len
}
args = [];
for ( i = 0; i < nargs; i++ ) {
args.push( arguments[ i ] );
}
// Use a workaround for being unable to combine `.apply` with the `new` operator:
proxy = Object.create( MultiSlice.prototype );
return MultiSlice.apply( proxy, args );
}
this._data = [];
for ( i = 0; i < nargs; i++ ) {
v = arguments[ i ];
if ( !isValid( v ) ) {
throw new TypeError( format( 'invalid argument. Provided arguments must be either a Slice, integer, null, or undefined. Argument: `%d`. Value: `%s`.', i, String( v ) ) );
}
this._data.push( ( v === void 0 ) ? null : v );
}
return this;
}
/**
* Constructor name.
*
* @name name
* @memberof MultiSlice
* @readonly
* @type {string}
* @default 'MultiSlice'
*
* @example
* var str = MultiSlice.name;
* // returns 'MultiSlice'
*/
setReadOnly( MultiSlice, 'name', 'MultiSlice' );
/**
* Returns the number of slice dimensions.
*
* @name ndims
* @memberof MultiSlice.prototype
* @readonly
* @type {NonNegativeInteger}
*
* @example
* var Slice = require( '@stdlib/slice/ctor' );
*
* var s1 = new Slice( 0, 10, 1 );
* var s2 = new Slice( 2, 12, 2 );
*
* var ms = new MultiSlice( null, s1, s2, 2 );
* // returns <MultiSlice>
*
* var ndims = ms.ndims;
* // returns 4
*/
setReadOnlyAccessor( MultiSlice.prototype, 'ndims', function get() {
return this._data.length;
});
/**
* Returns multi-slice data.
*
* @name data
* @memberof MultiSlice.prototype
* @readonly
* @type {Array<Slice|null|integer>}
*
* @example
* var Slice = require( '@stdlib/slice/ctor' );
*
* var s1 = new Slice( 0, 10, 1 );
* var s2 = new Slice( 2, 12, 2 );
*
* var ms = new MultiSlice( null, s1, s2, 2 );
* // returns <MultiSlice>
*
* var data = ms.data;
* // returns [...]
*
* var v = data[ 0 ];
* // returns null
*
* v = data[ 1 ];
* // returns <Slice>
*
* v = data[ 2 ];
* // returns <Slice>
*
* v = data[ 3 ];
* // returns 2
*/
setReadOnlyAccessor( MultiSlice.prototype, 'data', function get() {
return this._data.slice();
});
/**
* Serializes a multi-slice to a string.
*
* @name toString
* @memberof MultiSlice.prototype
* @type {Function}
* @returns {string} serialized MultiSlice
*
* @example
* var Slice = require( '@stdlib/slice/ctor' );
*
* var s1 = new Slice( 0, 10, 1 );
* var s2 = new Slice( 2, 12, 2 );
*
* var ms = new MultiSlice( null, s1, s2, 2 );
* // returns <MultiSlice>
*
* var str = ms.toString();
* // returns 'MultiSlice(null,Slice(0,10,1),Slice(2,12,2),2)'
*/
setReadOnly( MultiSlice.prototype, 'toString', function toString() {
var data;
var out;
var i;
data = this._data;
out = [];
for ( i = 0; i < data.length; i++ ) {
out.push( String( data[ i ] ) );
}
return 'MultiSlice('+out.join( ',' )+')';
});
/**
* Serializes a multi-slice as a JSON object.
*
* ## Notes
*
* - `JSON.stringify()` implicitly calls this method when stringifying a `MultiSlice` instance.
*
* @name toString
* @memberof MultiSlice.prototype
* @type {Function}
* @returns {Object} serialized MultiSlice
*
* @example
* var Slice = require( '@stdlib/slice/ctor' );
*
* var s1 = new Slice( 0, 10, 1 );
* var s2 = new Slice( 2, 12, 2 );
*
* var ms = new MultiSlice( null, s1, s2, 2 );
* // returns <MultiSlice>
*
* var o = ms.toJSON();
* // returns { 'type': 'MultiSlice', 'data': [ null, { 'type': 'Slice', 'data': [ 0, 10, 1 ] }, { 'type': 'Slice', 'data': [ 2, 12, 2 ] }, 2 ] }
*/
setReadOnly( MultiSlice.prototype, 'toJSON', function toJSON() {
var data;
var out;
var v;
var i;
data = this._data;
out = {
'type': 'MultiSlice',
'data': []
};
for ( i = 0; i < data.length; i++ ) {
v = data[ i ];
out.data.push( ( v && typeof v.toJSON === 'function' ) ? v.toJSON() : v );
}
return out;
});
// EXPORTS //
module.exports = MultiSlice;
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