time-to-botec

Benchmark sampling in different programming languages
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async.js (3047B)

      1 /**
      2 * @license Apache-2.0
      3 *
      4 * Copyright (c) 2018 The Stdlib Authors.
      5 *
      6 * Licensed under the Apache License, Version 2.0 (the "License");
      7 * you may not use this file except in compliance with the License.
      8 * You may obtain a copy of the License at
      9 *
     10 *    http://www.apache.org/licenses/LICENSE-2.0
     11 *
     12 * Unless required by applicable law or agreed to in writing, software
     13 * distributed under the License is distributed on an "AS IS" BASIS,
     14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     15 * See the License for the specific language governing permissions and
     16 * limitations under the License.
     17 */
     18 
     19 'use strict';
     20 
     21 // MODULES //
     22 
     23 var resolve = require( 'path' ).resolve;
     24 var isString = require( '@stdlib/assert/is-string' ).isPrimitive;
     25 var isFunction = require( '@stdlib/assert/is-function' );
     26 var cwd = require( '@stdlib/process/cwd' );
     27 var exists = require( './../../exists' );
     28 var validate = require( './validate.js' );
     29 
     30 
     31 // MAIN //
     32 
     33 /**
     34 * Asynchronously resolves a path by walking parent directories.
     35 *
     36 * @param {string} path - path to resolve
     37 * @param {Options} [options] - function options
     38 * @param {string} [options.dir] - base directory
     39 * @param {Callback} clbk - callback to invoke after resolving a path
     40 * @throws {TypeError} first argument must be a string
     41 * @throws {TypeError} callback argument must be a function
     42 * @throws {TypeError} options argument must be an object
     43 * @throws {TypeError} must provide valid options
     44 *
     45 * @example
     46 * resolveParentPath( 'package.json', onPath );
     47 *
     48 * function onPath( error, path ) {
     49 *     if ( error ) {
     50 *         throw error;
     51 *     }
     52 *     console.log( path );
     53 * }
     54 */
     55 function resolveParentPath( path, options, clbk ) {
     56 	var spath;
     57 	var child;
     58 	var opts;
     59 	var done;
     60 	var dir;
     61 	var err;
     62 	if ( !isString( path ) ) {
     63 		throw new TypeError( 'invalid argument. First argument must be a string primitive. Value: `' + path + '`.' );
     64 	}
     65 	opts = {};
     66 	if ( arguments.length > 2 ) {
     67 		done = clbk;
     68 		err = validate( opts, options );
     69 		if ( err ) {
     70 			throw err;
     71 		}
     72 	} else {
     73 		done = options;
     74 	}
     75 	if ( !isFunction( done ) ) {
     76 		throw new TypeError( 'invalid argument. Callback argument must be a function. Value: `' + done + '`.' );
     77 	}
     78 	if ( opts.dir ) {
     79 		dir = resolve( cwd(), opts.dir );
     80 	} else {
     81 		dir = cwd();
     82 	}
     83 	spath = resolve( dir, path );
     84 	exists( spath, onExists );
     85 
     86 	/**
     87 	* Callback invoked after checking for path existence.
     88 	*
     89 	* @private
     90 	* @param {(Error|null)} error - error object
     91 	* @param {boolean} bool - boolean indicating if a path exists
     92 	* @returns {void}
     93 	*/
     94 	function onExists( error, bool ) { // eslint-disable-line handle-callback-err
     95 		if ( bool ) {
     96 			return done( null, spath );
     97 		}
     98 		// Resolve a parent directory:
     99 		child = dir;
    100 		dir = resolve( dir, '..' );
    101 
    102 		// If we have already reached root, we cannot resolve any higher directories...
    103 		if ( child === dir ) {
    104 			return done( null, null );
    105 		}
    106 		// Resolve the next search path:
    107 		spath = resolve( dir, path );
    108 		exists( spath, onExists );
    109 	}
    110 }
    111 
    112 
    113 // EXPORTS //
    114 
    115 module.exports = resolveParentPath;