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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 format = require( '@stdlib/string/format' );
var resolveIndex = require( './resolve_index.js' );
// MAIN //
/**
* Resolves a list of subscripts from a serialized string of Cartesian indices.
*
* ## Notes
*
* - In non-strict mode, if provided an out-of-bounds subscript, the function returns `undefined`.
*
* @private
* @param {string} str - Cartesian indices string
* @param {NonNegativeIntegerArray} shape - dimensions
* @param {boolean} strict - boolean indicating whether to enforce strict bounds checking
* @throws {RangeError} index exceeds ndarray bounds
* @throws {RangeError} number of indices must match the number of ndarray dimensions
* @returns {(NonNegativeIntegerArray|void)} result
*/
function resolveSubscripts( str, shape, strict ) {
var ndims;
var out;
var idx;
var i;
ndims = shape.length;
// TODO: add support for serialized CartesianIndex instances: 'CartesianIndex(i,j,k)' => str2cartesian (similar to str2slice)
out = str.split( /\s*,\s*/ );
if ( out.length !== ndims ) {
throw new RangeError( format( 'invalid operation. Number of indices does not match the number of array dimensions. Array shape: (%s). Index dimensions: %u.', shape.join( ',' ), out.length ) );
}
// Normalize each subscript...
for ( i = 0; i < ndims; i++ ) {
idx = resolveIndex( out[ i ], shape[ i ], strict );
if ( idx === -1 ) {
// In non-strict mode, match normal object behavior by returning `undefined` for undefined/non-existent properties...
return;
}
out[ i ] = idx;
}
return out;
}
// EXPORTS //
module.exports = resolveSubscripts;
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