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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 isString = require( '@stdlib/assert/is-string' ).isPrimitive;
var format = require( '@stdlib/string/format' );
// MAIN //
/**
* Parses a JSON Pointer string into an array of reference tokens.
*
* ## Notes
*
* - Implements parsing per RFC 6901.
* - An empty string returns an empty array (refers to the root of the document).
* - Escape sequences are decoded: `~1` is unescaped to `/` before `~0` is unescaped to `~`.
*
* @param {string} pointer - JSON Pointer string
* @throws {TypeError} must provide a string
* @throws {Error} pointer must be empty or start with a `/` character
* @returns {Array<string>} array of unescaped reference tokens
*
* @example
* var tokens = parse( '/foo/bar' );
* // returns [ 'foo', 'bar' ]
*
* @example
* var tokens = parse( '/a~1b/c~0d' );
* // returns [ 'a/b', 'c~d' ]
*
* @example
* var tokens = parse( '' );
* // returns []
*/
function parse( pointer ) {
var tokens;
var i;
if ( !isString( pointer ) ) {
throw new TypeError( format( 'invalid argument. Must provide a string. Value: `%s`.', pointer ) );
}
// An empty string refers to the root of the document:
if ( pointer === '' ) {
return [];
}
// Per RFC 6901, a non-empty pointer MUST begin with '/':
if ( pointer.charAt( 0 ) !== '/' ) {
throw new Error( format( 'invalid argument. JSON Pointer must be an empty string or start with a `/` character. Value: `%s`.', pointer ) );
}
tokens = pointer.split( '/' );
tokens = tokens.slice( 1 );
// Unescape reference tokens per RFC 6901 (note: '~1' must be replaced before '~0' to avoid corrupting sequences such as '~01'):
for ( i = 0; i < tokens.length; i++ ) {
tokens[ i ] = tokens[ i ].replace( /~1/g, '/' );
tokens[ i ] = tokens[ i ].replace( /~0/g, '~' );
}
return tokens;
}
// EXPORTS //
module.exports = parse;
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