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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.
*/
'use strict';
// MODULES //
var isPlainObject = require( '@stdlib/assert/is-plain-object' );
var isBoolean = require( '@stdlib/assert/is-boolean' ).isPrimitive;
var isInteger = require( '@stdlib/assert/is-integer' ).isPrimitive;
var isndarrayLike = require( '@stdlib/assert/is-ndarray-like' );
var isUndefined = require( '@stdlib/assert/is-undefined' );
var isSlice = require( '@stdlib/assert/is-slice' );
var isNull = require( '@stdlib/assert/is-null' );
var hasOwnProp = require( '@stdlib/assert/has-own-property' );
var Slice = require( '@stdlib/slice/ctor' );
var base = require( '@stdlib/ndarray/base/slice-dimension' );
var format = require( '@stdlib/string/format' );
// MAIN //
/**
* Returns a read-only view of an input ndarray when sliced along a specified dimension.
*
* @param {ndarray} x - input array
* @param {integer} dim - index of dimension to slice
* @param {(Slice|integer|null|undefined)} s - slice argument
* @param {Options} [options] - options
* @param {boolean} [options.strict] - boolean indicating whether to enforce strict bounds checking
* @throws {TypeError} first argument must be an ndarray having one or more dimensions
* @throws {TypeError} second argument must be an integer
* @throws {TypeError} third argument must be either a Slice, integer, null, or undefined
* @throws {TypeError} options argument must be an object
* @throws {TypeError} must provide valid options
* @throws {RangeError} dimension index exceeds the number of dimensions
* @throws {RangeError} slice exceeds array bounds
* @returns {ndarray} ndarray view
*
* @example
* var Slice = require( '@stdlib/slice/ctor' );
* var ndarray = require( '@stdlib/ndarray/ctor' );
* var ndarray2array = require( '@stdlib/ndarray/to-array' );
*
* var buffer = [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ];
* var shape = [ 3, 2 ];
* var strides = [ 2, 1 ];
* var offset = 0;
*
* var x = ndarray( 'generic', buffer, shape, strides, offset, 'row-major' );
* // returns <ndarray>
*
* var sh = x.shape;
* // returns [ 3, 2 ]
*
* var arr = ndarray2array( x );
* // returns [ [ 1.0, 2.0 ], [ 3.0, 4.0 ], [ 5.0, 6.0 ] ]
*
* var s = new Slice( null, null, -1 );
* // returns <Slice>
*
* var y = sliceDimension( x, 0, s );
* // returns <ndarray>
*
* sh = y.shape;
* // returns [ 3, 2 ]
*
* arr = ndarray2array( y );
* // returns [ [ 5.0, 6.0 ], [ 3.0, 4.0 ], [ 1.0, 2.0 ] ]
*/
function sliceDimension( x, dim, s ) {
var options;
var slice;
var opts;
opts = {
'strict': true
};
if ( !isndarrayLike( x ) ) {
throw new TypeError( format( 'invalid argument. First argument must be an ndarray. Value: `%s`.', x ) );
}
if ( !isInteger( dim ) ) {
throw new TypeError( format( 'invalid argument. Second argument must be an integer. Value: `%s`.', dim ) );
}
if ( isInteger( s ) || isSlice( s ) ) {
slice = s;
} else if ( isNull( s ) || isUndefined( s ) ) {
slice = new Slice();
} else {
throw new TypeError( format( 'invalid argument. Third argument must be either a Slice, integer, null, or undefined. Value: `%s`.', s ) );
}
if ( arguments.length > 3 ) {
options = arguments[ 3 ];
if ( !isPlainObject( options ) ) {
throw new TypeError( format( 'invalid argument. Options argument must be an object. Value: `%s`.', options ) );
}
if ( hasOwnProp( options, 'strict' ) ) {
if ( !isBoolean( options.strict ) ) {
throw new TypeError( format( 'invalid option. `%s` option must be a boolean. Option: `%s`.', 'strict', options.strict ) );
}
opts.strict = options.strict;
}
}
return base( x, dim, slice, opts.strict, false );
}
// EXPORTS //
module.exports = sliceDimension;
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