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* @license Apache-2.0
*
* Copyright (c) 2026 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 isArray = require( '@stdlib/assert/is-array' );
var format = require( '@stdlib/string/format' );
// VARIABLES //
var RE_ARRAY_INDEX = /^(?:0|[1-9][0-9]*)$/;
// MAIN //
/**
* Resolves a JSON Pointer reference token against a container.
*
* ## Notes
*
* - For arrays, returns an integer index.
* - For arrays, the `-` token is resolved to `container.length`.
* - For objects, returns the token string as-is.
*
* @param {(Object|Array)} container - parent container
* @param {string} token - reference token
* @throws {Error} invalid array index in pointer
* @returns {(string|NonNegativeInteger)} resolved key
*
* @example
* var arr = [ 1, 2, 3 ];
* var key = resolveToken( arr, '0' );
* // returns 0
*
* @example
* var arr = [ 1, 2, 3 ];
* var key = resolveToken( arr, '-' );
* // returns 3
*
* @example
* var obj = {
* 'foo': 'bar'
* };
* var key = resolveToken( obj, 'foo' );
* // returns 'foo'
*/
function resolveToken( container, token ) {
var idx;
if ( isArray( container ) ) {
if ( token === '-' ) {
return container.length;
}
if ( !RE_ARRAY_INDEX.test( token ) ) {
throw new Error( format( 'invalid argument. Invalid array index in pointer. Value: `%s`.', token ) );
}
idx = parseInt( token, 10 );
return idx;
}
return token;
}
// EXPORTS //
module.exports = resolveToken;
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