feat: add utils/json-pointer/base/resolve-token

lib/node_modules/@stdlib/utils/json-pointer/base/resolve-token/README.md

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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.
+
+-->
+
+# resolveToken
+
+> Resolve a JSON Pointer reference token against a container.
+
+<!-- Section to include introductory text. Make sure to keep an empty line after the intro `section` element and another before the `/section` close. -->
+
+<section class="intro">
+
+This function resolves a [JSON Pointer][json-pointer] reference token against a container, returning the appropriate key.
+
+</section>
+
+<!-- /.intro -->
+
+<!-- Package usage documentation. -->
+
+<section class="usage">
+
+## Usage
+
+```javascript
+var resolveToken = require( '@stdlib/utils/json-pointer/base/resolve-token' );
+```
+
+#### resolveToken( container, token )
+
+Resolves a JSON Pointer reference token against a container.
+
+```javascript
+var obj = {
+    'foo': 'bar'
+};
+var arr = [ 1, 2, 3 ];
+
+var key = resolveToken( obj, 'foo' );
+// returns 'foo'
+
+key = resolveToken( arr, '0' );
+// returns 0
+
+key = resolveToken( arr, '-' );
+// returns 3
+```
+
+</section>
+
+<!-- /.usage -->
+
+<!-- Package usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
+
+<section class="notes">
+
+## Notes
+
+-   For arrays, returns an integer index.
+-   For arrays, the `-` token is resolved to the array length (`container.length`).
+-   For objects, returns the token string as-is.
+-   If `container` is an array and `token` is not a valid array index (or `-`), the function throws an error.
+
+</section>
+
+<!-- /.notes -->
+
+<!-- Package usage examples. -->
+
+<section class="examples">
+
+## Examples
+
+<!-- eslint no-undef: "error" -->
+
+```javascript
+var resolveToken = require( '@stdlib/utils/json-pointer/base/resolve-token' );
+
+var arr = [ 'apple', 'banana', 'cherry' ];
+var obj = {
+    'foo': 'bar',
+    '0': 'baz'
+};
+
+var key = resolveToken( arr, '0' );
+console.log( key );
+// => 0
+
+key = resolveToken( arr, '2' );
+console.log( key );
+// => 2
+
+key = resolveToken( arr, '-' );
+console.log( key );
+// => 3
+
+key = resolveToken( obj, 'foo' );
+console.log( key );
+// => 'foo'
+
+key = resolveToken( obj, '0' );
+console.log( key );
+// => '0'
+```
+
+</section>
+
+<!-- /.examples -->
+
+<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->
+
+<section class="related">
+
+</section>
+
+<!-- /.related -->
+
+<!-- Section for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
+
+<section class="links">
+
+[json-pointer]: https://tools.ietf.org/html/rfc6901
+
+</section>
+
+<!-- /.links -->

lib/node_modules/@stdlib/utils/json-pointer/base/resolve-token/benchmark/benchmark.js

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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 bench = require( '@stdlib/bench' );
+var format = require( '@stdlib/string/format' );
+var pkg = require( './../package.json' ).name;
+var resolveToken = require( './../lib' );
+
+
+// MAIN //
+
+bench( format( '%s::array', pkg ), function benchmark( b ) {
+	var tokens;
+	var arr;
+	var out;
+	var i;
+
+	arr = [ 1, 2, 3, 4, 5 ];
+	tokens = [ '0', '1', '2', '3', '4', '-' ];
+
+	b.tic();
+	for ( i = 0; i < b.iterations; i++ ) {
+		out = resolveToken( arr, tokens[ i % tokens.length ] );
+		if ( typeof out !== 'number' ) {
+			b.fail( 'should return a number' );
+		}
+	}
+	b.toc();
+	if ( typeof out !== 'number' ) {
+		b.fail( 'should return a number' );
+	}
+	b.pass( 'benchmark finished' );
+	b.end();
+});
+
+bench( format( '%s::object', pkg ), function benchmark( b ) {
+	var tokens;
+	var obj;
+	var out;
+	var i;
+
+	obj = {
+		'foo': 1,
+		'bar': 2,
+		'baz': 3,
+		'qux': 4
+	};
+	tokens = [ 'foo', 'bar', 'baz', 'qux' ];
+
+	b.tic();
+	for ( i = 0; i < b.iterations; i++ ) {
+		out = resolveToken( obj, tokens[ i % tokens.length ] );
+		if ( typeof out !== 'string' ) {
+			b.fail( 'should return a string' );
+		}
+	}
+	b.toc();
+	if ( typeof out !== 'string' ) {
+		b.fail( 'should return a string' );
+	}
+	b.pass( 'benchmark finished' );
+	b.end();
+});

lib/node_modules/@stdlib/utils/json-pointer/base/resolve-token/docs/repl.txt

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+
+{{alias}}( container, token )
+    Resolves a JSON Pointer reference token against a container.
+
+    For arrays, returns an integer index. The '-' token is resolved to the
+    array length. Invalid array indices throw an error.
+
+    For objects, returns the token string as-is.
+
+    Parameters
+    ----------
+    container: Object|Array
+        Parent container.
+
+    token: string
+        JSON Pointer reference token.
+
+    Returns
+    -------
+    key: string|integer
+        Resolved key.
+
+    Examples
+    --------
+    > var key = {{alias}}( [ 1, 2, 3 ], '0' )
+    0
+    > key = {{alias}}( [ 1, 2, 3 ], '-' )
+    3
+    > key = {{alias}}( { 'foo': 'bar' }, 'foo' )
+    'foo'
+
+    See Also
+    --------
+

lib/node_modules/@stdlib/utils/json-pointer/base/resolve-token/docs/types/index.d.ts

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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.
+*/
+
+// TypeScript Version: 4.1
+
+/**
+* Resolves a JSON Pointer reference token against a container.
+*
+* @param container - parent container
+* @param token - reference token
+* @throws invalid array index in pointer
+* @returns 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'
+*/
+declare function resolveToken( container: Array<any> | Record<string, any>, token: string ): string | number;
+
+
+// EXPORTS //
+
+export = resolveToken;

lib/node_modules/@stdlib/utils/json-pointer/base/resolve-token/docs/types/test.ts

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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.
+*/
+
+import resolveToken = require( './index' );
+
+
+// TESTS //
+
+// The function returns a string or number...
+{
+	resolveToken( [ 1, 2, 3 ], '0' ); // $ExpectType string | number
+	resolveToken( { 'foo': 'bar' }, 'foo' ); // $ExpectType string | number
+}
+
+// The compiler throws an error if the function is provided an unsupported number of arguments...
+{
+	resolveToken(); // $ExpectError
+	resolveToken( [ 1, 2, 3 ] ); // $ExpectError
+	resolveToken( [ 1, 2, 3 ], '0', 123 ); // $ExpectError
+}

lib/node_modules/@stdlib/utils/json-pointer/base/resolve-token/examples/index.js

@@ -0,0 +1,47 @@
+/**
+* @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';
+
+var resolveToken = require( './../lib' );
+
+var arr = [ 'apple', 'banana', 'cherry' ];
+var obj = {
+	'foo': 'bar',
+	'0': 'baz'
+};
+
+var key = resolveToken( arr, '0' );
+console.log( key );
+// => 0
+
+key = resolveToken( arr, '2' );
+console.log( key );
+// => 2
+
+key = resolveToken( arr, '-' );
+console.log( key );
+// => 3
+
+key = resolveToken( obj, 'foo' );
+console.log( key );
+// => 'foo'
+
+key = resolveToken( obj, '0' );
+console.log( key );
+// => '0'