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Filename : Resolver.js
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/*
	MIT License http://www.opensource.org/licenses/mit-license.php
	Author Tobias Koppers @sokra
*/

"use strict";

const { AsyncSeriesBailHook, AsyncSeriesHook, SyncHook } = require("tapable");
const createInnerContext = require("./createInnerContext");
const { parseIdentifier } = require("./util/identifier");
const {
	normalize,
	cachedJoin: join,
	getType,
	PathType
} = require("./util/path");

/** @typedef {import("./ResolverFactory").ResolveOptions} ResolveOptions */

/** @typedef {Error & { details?: string }} ErrorWithDetail */

/** @typedef {(err: ErrorWithDetail | null, res?: string | false, req?: ResolveRequest) => void} ResolveCallback */

/**
 * @typedef {Object} PossibleFileSystemError
 * @property {string=} code
 * @property {number=} errno
 * @property {string=} path
 * @property {string=} syscall
 */

/**
 * @template T
 * @callback FileSystemCallback
 * @param {PossibleFileSystemError & Error | null} err
 * @param {T=} result
 */

/**
 * @typedef {string | Buffer | URL} PathLike
 */

/**
 * @typedef {PathLike | number} PathOrFileDescriptor
 */

/**
 * @typedef {Object} ObjectEncodingOptions
 * @property {BufferEncoding | null | undefined} [encoding]
 */

/** @typedef {function(NodeJS.ErrnoException | null, string=): void} StringCallback */
/** @typedef {function(NodeJS.ErrnoException | null, Buffer=): void} BufferCallback */
/** @typedef {function(NodeJS.ErrnoException | null, (string | Buffer)=): void} StringOrBufferCallback */
/** @typedef {function(NodeJS.ErrnoException | null, IStats=): void} StatsCallback */
/** @typedef {function(NodeJS.ErrnoException | null, IBigIntStats=): void} BigIntStatsCallback */
/** @typedef {function(NodeJS.ErrnoException | null, (IStats | IBigIntStats)=): void} StatsOrBigIntStatsCallback */
/** @typedef {function(NodeJS.ErrnoException | Error | null, JsonObject=): void} ReadJsonCallback */
/** @typedef {function(NodeJS.ErrnoException | null, string[]=): void} ReaddirStringCallback */
/** @typedef {function(NodeJS.ErrnoException | null, Buffer[]=): void} ReaddirBufferCallback */
/** @typedef {function(NodeJS.ErrnoException | null, (string[] | Buffer[])=): void} ReaddirStringOrBufferCallback */
/** @typedef {function(NodeJS.ErrnoException | null, Dirent[]=): void} ReaddirDirentCallback */

/**
 * @template T
 * @typedef {Object} IStatsBase
 * @property {() => boolean} isFile
 * @property {() => boolean} isDirectory
 * @property {() => boolean} isBlockDevice
 * @property {() => boolean} isCharacterDevice
 * @property {() => boolean} isSymbolicLink
 * @property {() => boolean} isFIFO
 * @property {() => boolean} isSocket
 * @property {T} dev
 * @property {T} ino
 * @property {T} mode
 * @property {T} nlink
 * @property {T} uid
 * @property {T} gid
 * @property {T} rdev
 * @property {T} size
 * @property {T} blksize
 * @property {T} blocks
 * @property {T} atimeMs
 * @property {T} mtimeMs
 * @property {T} ctimeMs
 * @property {T} birthtimeMs
 * @property {Date} atime
 * @property {Date} mtime
 * @property {Date} ctime
 * @property {Date} birthtime
 */

/**
 * @typedef {IStatsBase<number>} IStats
 */

/**
 * @typedef {IStatsBase<bigint> & { atimeNs: bigint, mtimeNs: bigint, ctimeNs: bigint, birthtimeNs: bigint  }} IBigIntStats
 */

/**
 * @typedef {Object} Dirent
 * @property {() => boolean} isFile
 * @property {() => boolean} isDirectory
 * @property {() => boolean} isBlockDevice
 * @property {() => boolean} isCharacterDevice
 * @property {() => boolean} isSymbolicLink
 * @property {() => boolean} isFIFO
 * @property {() => boolean} isSocket
 * @property {string} name
 * @property {string} path
 */

/**
 * @typedef {Object} StatOptions
 * @property {(boolean | undefined)=} bigint
 */

/**
 * @typedef {Object} StatSyncOptions
 * @property {(boolean | undefined)=} bigint
 * @property {(boolean | undefined)=} throwIfNoEntry
 */

/**
 * @typedef {{
 * (path: PathOrFileDescriptor, options: ({ encoding?: null | undefined, flag?: string | undefined } & import("events").Abortable) | undefined | null, callback: BufferCallback): void;
 * (path: PathOrFileDescriptor, options: ({ encoding: BufferEncoding, flag?: string | undefined } & import("events").Abortable) | BufferEncoding, callback: StringCallback): void;
 * (path: PathOrFileDescriptor, options: (ObjectEncodingOptions & { flag?: string | undefined } & import("events").Abortable) | BufferEncoding | undefined | null, callback: StringOrBufferCallback): void;
 * (path: PathOrFileDescriptor, callback: BufferCallback): void;
 * }} ReadFile
 */

/**
 * @typedef {ObjectEncodingOptions | BufferEncoding | undefined | null} EncodingOption
 */

/**
 * @typedef {'buffer'| { encoding: 'buffer' }} BufferEncodingOption
 */

/**
 * @typedef {{
 * (path: PathOrFileDescriptor, options?: { encoding?: null | undefined, flag?: string | undefined } | null): Buffer;
 * (path: PathOrFileDescriptor, options: { encoding: BufferEncoding, flag?: string | undefined } | BufferEncoding): string;
 * (path: PathOrFileDescriptor, options?: (ObjectEncodingOptions & { flag?: string | undefined }) | BufferEncoding | null): string | Buffer;
 * }} ReadFileSync
 */

/**
 * @typedef {{
 * (path: PathLike, options: { encoding: BufferEncoding | null, withFileTypes?: false | undefined, recursive?: boolean | undefined } | BufferEncoding | undefined | null, callback: ReaddirStringCallback): void;
 * (path: PathLike, options: { encoding: 'buffer', withFileTypes?: false | undefined, recursive?: boolean | undefined } | 'buffer', callback: ReaddirBufferCallback): void;
 * (path: PathLike, callback: ReaddirStringCallback): void;
 * (path: PathLike, options: (ObjectEncodingOptions & { withFileTypes?: false | undefined, recursive?: boolean | undefined }) | BufferEncoding | undefined | null, callback: ReaddirStringOrBufferCallback): void;
 * (path: PathLike, options: ObjectEncodingOptions & { withFileTypes: true, recursive?: boolean | undefined }, callback: ReaddirDirentCallback): void;
 * }} Readdir
 */

/**
 * @typedef {{
 * (path: PathLike, options?: { encoding: BufferEncoding | null, withFileTypes?: false | undefined, recursive?: boolean | undefined } | BufferEncoding | null): string[];
 * (path: PathLike, options: { encoding: 'buffer', withFileTypes?: false | undefined, recursive?: boolean | undefined } | 'buffer'): Buffer[];
 * (path: PathLike, options?: (ObjectEncodingOptions & { withFileTypes?: false | undefined, recursive?: boolean | undefined }) | BufferEncoding | null): string[] | Buffer[];
 * (path: PathLike, options: ObjectEncodingOptions & { withFileTypes: true, recursive?: boolean | undefined }): Dirent[];
 * }} ReaddirSync

 /**
 * @typedef {function(PathOrFileDescriptor, ReadJsonCallback): void} ReadJson
 */

/**
 * @typedef {function(PathOrFileDescriptor): JsonObject} ReadJsonSync
 */

/**
 * @typedef {{
 * (path: PathLike, options: EncodingOption, callback: StringCallback): void;
 * (path: PathLike, options: BufferEncodingOption, callback: BufferCallback): void;
 * (path: PathLike, options: EncodingOption, callback: StringOrBufferCallback): void;
 * (path: PathLike, callback: StringCallback): void;
 * }} Readlink
 */

/**
 * @typedef {{
 * (path: PathLike, options?: EncodingOption): string;
 * (path: PathLike, options: BufferEncodingOption): Buffer;
 * (path: PathLike, options?: EncodingOption): string | Buffer;
 * }} ReadlinkSync
 */

/**
 * @typedef {{
 * (path: PathLike, callback: StatsCallback): void;
 * (path: PathLike, options: (StatOptions & { bigint?: false | undefined }) | undefined, callback: StatsCallback): void;
 * (path: PathLike, options: StatOptions & { bigint: true }, callback: BigIntStatsCallback): void;
 * (path: PathLike, options: StatOptions | undefined, callback: StatsOrBigIntStatsCallback): void;
 * }} LStat
 */

/**
 * @typedef {{
 * (path: PathLike, options?: undefined): IStats;
 * (path: PathLike, options?: StatSyncOptions & { bigint?: false | undefined, throwIfNoEntry: false }): IStats | undefined;
 * (path: PathLike, options: StatSyncOptions & { bigint: true, throwIfNoEntry: false }): IBigIntStats | undefined;
 * (path: PathLike, options?: StatSyncOptions & { bigint?: false | undefined }): IStats;
 * (path: PathLike, options: StatSyncOptions & { bigint: true }): IBigIntStats;
 * (path: PathLike,  options: StatSyncOptions & { bigint: boolean, throwIfNoEntry?: false | undefined }): IStats | IBigIntStats;
 * (path: PathLike,  options?: StatSyncOptions): IStats | IBigIntStats | undefined;
 * }} LStatSync
 */

/**
 * @typedef {{
 * (path: PathLike, callback: StatsCallback): void;
 * (path: PathLike, options: (StatOptions & { bigint?: false | undefined }) | undefined, callback: StatsCallback): void;
 * (path: PathLike, options: StatOptions & { bigint: true }, callback: BigIntStatsCallback): void;
 * (path: PathLike, options: StatOptions | undefined, callback: StatsOrBigIntStatsCallback): void;
 * }} Stat
 */

/**
 * @typedef {{
 * (path: PathLike, options?: undefined): IStats;
 * (path: PathLike, options?: StatSyncOptions & { bigint?: false | undefined, throwIfNoEntry: false }): IStats | undefined;
 * (path: PathLike, options: StatSyncOptions & { bigint: true, throwIfNoEntry: false }): IBigIntStats | undefined;
 * (path: PathLike, options?: StatSyncOptions & { bigint?: false | undefined }): IStats;
 * (path: PathLike, options: StatSyncOptions & { bigint: true }): IBigIntStats;
 * (path: PathLike,  options: StatSyncOptions & { bigint: boolean, throwIfNoEntry?: false | undefined }): IStats | IBigIntStats;
 * (path: PathLike,  options?: StatSyncOptions): IStats | IBigIntStats | undefined;
 * }} StatSync
 */

/**
 * @typedef {{
 * (path: PathLike, options: EncodingOption, callback: StringCallback): void;
 * (path: PathLike, options: BufferEncodingOption, callback: BufferCallback): void;
 * (path: PathLike, options: EncodingOption, callback: StringOrBufferCallback): void;
 * (path: PathLike, callback: StringCallback): void;
 * }} RealPath
 */

/**
 * @typedef {{
 * (path: PathLike, options?: EncodingOption): string;
 * (path: PathLike, options: BufferEncodingOption): Buffer;
 * (path: PathLike, options?: EncodingOption): string | Buffer;
 * }} RealPathSync
 */

/**
 * @typedef {Object} FileSystem
 * @property {ReadFile} readFile
 * @property {Readdir} readdir
 * @property {ReadJson=} readJson
 * @property {Readlink} readlink
 * @property {LStat=} lstat
 * @property {Stat} stat
 * @property {RealPath=} realpath
 */

/**
 * @typedef {Object} SyncFileSystem
 * @property {ReadFileSync} readFileSync
 * @property {ReaddirSync} readdirSync
 * @property {ReadJsonSync=} readJsonSync
 * @property {ReadlinkSync} readlinkSync
 * @property {LStatSync=} lstatSync
 * @property {StatSync} statSync
 * @property {RealPathSync=} realpathSync
 */

/**
 * @typedef {Object} ParsedIdentifier
 * @property {string} request
 * @property {string} query
 * @property {string} fragment
 * @property {boolean} directory
 * @property {boolean} module
 * @property {boolean} file
 * @property {boolean} internal
 */

/** @typedef {string | number | boolean | null} JsonPrimitive */
/** @typedef {JsonValue[]} JsonArray */
/** @typedef {JsonPrimitive | JsonObject | JsonArray} JsonValue */
/** @typedef {{[Key in string]: JsonValue} & {[Key in string]?: JsonValue | undefined}} JsonObject */

/**
 * @typedef {Object} BaseResolveRequest
 * @property {string | false} path
 * @property {object=} context
 * @property {string=} descriptionFilePath
 * @property {string=} descriptionFileRoot
 * @property {JsonObject=} descriptionFileData
 * @property {string=} relativePath
 * @property {boolean=} ignoreSymlinks
 * @property {boolean=} fullySpecified
 * @property {string=} __innerRequest
 * @property {string=} __innerRequest_request
 * @property {string=} __innerRequest_relativePath
 */

/** @typedef {BaseResolveRequest & Partial<ParsedIdentifier>} ResolveRequest */

/**
 * String with special formatting
 * @typedef {string} StackEntry
 */

/**
 * @template T
 * @typedef {{ add: (item: T) => void }} WriteOnlySet
 */

/** @typedef {(function (ResolveRequest): void)} ResolveContextYield */

/**
 * Resolve context
 * @typedef {Object} ResolveContext
 * @property {WriteOnlySet<string>=} contextDependencies
 * @property {WriteOnlySet<string>=} fileDependencies files that was found on file system
 * @property {WriteOnlySet<string>=} missingDependencies dependencies that was not found on file system
 * @property {Set<StackEntry>=} stack set of hooks' calls. For instance, `resolve → parsedResolve → describedResolve`,
 * @property {(function(string): void)=} log log function
 * @property {ResolveContextYield=} yield yield result, if provided plugins can return several results
 */

/** @typedef {AsyncSeriesBailHook<[ResolveRequest, ResolveContext], ResolveRequest | null>} ResolveStepHook */

/**
 * @typedef {Object} KnownHooks
 * @property {SyncHook<[ResolveStepHook, ResolveRequest], void>} resolveStep
 * @property {SyncHook<[ResolveRequest, Error]>} noResolve
 * @property {ResolveStepHook} resolve
 * @property {AsyncSeriesHook<[ResolveRequest, ResolveContext]>} result
 */

/**
 * @typedef {{[key: string]: ResolveStepHook}} EnsuredHooks
 */

/**
 * @param {string} str input string
 * @returns {string} in camel case
 */
function toCamelCase(str) {
	return str.replace(/-([a-z])/g, str => str.slice(1).toUpperCase());
}

class Resolver {
	/**
	 * @param {ResolveStepHook} hook hook
	 * @param {ResolveRequest} request request
	 * @returns {StackEntry} stack entry
	 */
	static createStackEntry(hook, request) {
		return (
			hook.name +
			": (" +
			request.path +
			") " +
			(request.request || "") +
			(request.query || "") +
			(request.fragment || "") +
			(request.directory ? " directory" : "") +
			(request.module ? " module" : "")
		);
	}

	/**
	 * @param {FileSystem} fileSystem a filesystem
	 * @param {ResolveOptions} options options
	 */
	constructor(fileSystem, options) {
		this.fileSystem = fileSystem;
		this.options = options;
		/** @type {KnownHooks} */
		this.hooks = {
			resolveStep: new SyncHook(["hook", "request"], "resolveStep"),
			noResolve: new SyncHook(["request", "error"], "noResolve"),
			resolve: new AsyncSeriesBailHook(
				["request", "resolveContext"],
				"resolve"
			),
			result: new AsyncSeriesHook(["result", "resolveContext"], "result")
		};
	}

	/**
	 * @param {string | ResolveStepHook} name hook name or hook itself
	 * @returns {ResolveStepHook} the hook
	 */
	ensureHook(name) {
		if (typeof name !== "string") {
			return name;
		}
		name = toCamelCase(name);
		if (/^before/.test(name)) {
			return /** @type {ResolveStepHook} */ (
				this.ensureHook(name[6].toLowerCase() + name.slice(7)).withOptions({
					stage: -10
				})
			);
		}
		if (/^after/.test(name)) {
			return /** @type {ResolveStepHook} */ (
				this.ensureHook(name[5].toLowerCase() + name.slice(6)).withOptions({
					stage: 10
				})
			);
		}
		/** @type {ResolveStepHook} */
		const hook = /** @type {KnownHooks & EnsuredHooks} */ (this.hooks)[name];
		if (!hook) {
			/** @type {KnownHooks & EnsuredHooks} */
			(this.hooks)[name] = new AsyncSeriesBailHook(
				["request", "resolveContext"],
				name
			);

			return /** @type {KnownHooks & EnsuredHooks} */ (this.hooks)[name];
		}
		return hook;
	}

	/**
	 * @param {string | ResolveStepHook} name hook name or hook itself
	 * @returns {ResolveStepHook} the hook
	 */
	getHook(name) {
		if (typeof name !== "string") {
			return name;
		}
		name = toCamelCase(name);
		if (/^before/.test(name)) {
			return /** @type {ResolveStepHook} */ (
				this.getHook(name[6].toLowerCase() + name.slice(7)).withOptions({
					stage: -10
				})
			);
		}
		if (/^after/.test(name)) {
			return /** @type {ResolveStepHook} */ (
				this.getHook(name[5].toLowerCase() + name.slice(6)).withOptions({
					stage: 10
				})
			);
		}
		/** @type {ResolveStepHook} */
		const hook = /** @type {KnownHooks & EnsuredHooks} */ (this.hooks)[name];
		if (!hook) {
			throw new Error(`Hook ${name} doesn't exist`);
		}
		return hook;
	}

	/**
	 * @param {object} context context information object
	 * @param {string} path context path
	 * @param {string} request request string
	 * @returns {string | false} result
	 */
	resolveSync(context, path, request) {
		/** @type {Error | null | undefined} */
		let err = undefined;
		/** @type {string | false | undefined} */
		let result = undefined;
		let sync = false;
		this.resolve(context, path, request, {}, (e, r) => {
			err = e;
			result = r;
			sync = true;
		});
		if (!sync) {
			throw new Error(
				"Cannot 'resolveSync' because the fileSystem is not sync. Use 'resolve'!"
			);
		}
		if (err) throw err;
		if (result === undefined) throw new Error("No result");
		return result;
	}

	/**
	 * @param {object} context context information object
	 * @param {string} path context path
	 * @param {string} request request string
	 * @param {ResolveContext} resolveContext resolve context
	 * @param {ResolveCallback} callback callback function
	 * @returns {void}
	 */
	resolve(context, path, request, resolveContext, callback) {
		if (!context || typeof context !== "object")
			return callback(new Error("context argument is not an object"));
		if (typeof path !== "string")
			return callback(new Error("path argument is not a string"));
		if (typeof request !== "string")
			return callback(new Error("request argument is not a string"));
		if (!resolveContext)
			return callback(new Error("resolveContext argument is not set"));

		/** @type {ResolveRequest} */
		const obj = {
			context: context,
			path: path,
			request: request
		};

		/** @type {ResolveContextYield | undefined} */
		let yield_;
		let yieldCalled = false;
		/** @type {ResolveContextYield | undefined} */
		let finishYield;
		if (typeof resolveContext.yield === "function") {
			const old = resolveContext.yield;
			/**
			 * @param {ResolveRequest} obj object
			 */
			yield_ = obj => {
				old(obj);
				yieldCalled = true;
			};
			/**
			 * @param {ResolveRequest} result result
			 * @returns {void}
			 */
			finishYield = result => {
				if (result) {
					/** @type {ResolveContextYield} */ (yield_)(result);
				}
				callback(null);
			};
		}

		const message = `resolve '${request}' in '${path}'`;

		/**
		 * @param {ResolveRequest} result result
		 * @returns {void}
		 */
		const finishResolved = result => {
			return callback(
				null,
				result.path === false
					? false
					: `${result.path.replace(/#/g, "\0#")}${
							result.query ? result.query.replace(/#/g, "\0#") : ""
					  }${result.fragment || ""}`,
				result
			);
		};

		/**
		 * @param {string[]} log logs
		 * @returns {void}
		 */
		const finishWithoutResolve = log => {
			/**
			 * @type {ErrorWithDetail}
			 */
			const error = new Error("Can't " + message);
			error.details = log.join("\n");
			this.hooks.noResolve.call(obj, error);
			return callback(error);
		};

		if (resolveContext.log) {
			// We need log anyway to capture it in case of an error
			const parentLog = resolveContext.log;
			/** @type {string[]} */
			const log = [];
			return this.doResolve(
				this.hooks.resolve,
				obj,
				message,
				{
					log: msg => {
						parentLog(msg);
						log.push(msg);
					},
					yield: yield_,
					fileDependencies: resolveContext.fileDependencies,
					contextDependencies: resolveContext.contextDependencies,
					missingDependencies: resolveContext.missingDependencies,
					stack: resolveContext.stack
				},
				(err, result) => {
					if (err) return callback(err);

					if (yieldCalled || (result && yield_)) {
						return /** @type {ResolveContextYield} */ (finishYield)(
							/** @type {ResolveRequest} */ (result)
						);
					}

					if (result) return finishResolved(result);

					return finishWithoutResolve(log);
				}
			);
		} else {
			// Try to resolve assuming there is no error
			// We don't log stuff in this case
			return this.doResolve(
				this.hooks.resolve,
				obj,
				message,
				{
					log: undefined,
					yield: yield_,
					fileDependencies: resolveContext.fileDependencies,
					contextDependencies: resolveContext.contextDependencies,
					missingDependencies: resolveContext.missingDependencies,
					stack: resolveContext.stack
				},
				(err, result) => {
					if (err) return callback(err);

					if (yieldCalled || (result && yield_)) {
						return /** @type {ResolveContextYield} */ (finishYield)(
							/** @type {ResolveRequest} */ (result)
						);
					}

					if (result) return finishResolved(result);

					// log is missing for the error details
					// so we redo the resolving for the log info
					// this is more expensive to the success case
					// is assumed by default
					/** @type {string[]} */
					const log = [];

					return this.doResolve(
						this.hooks.resolve,
						obj,
						message,
						{
							log: msg => log.push(msg),
							yield: yield_,
							stack: resolveContext.stack
						},
						(err, result) => {
							if (err) return callback(err);

							// In a case that there is a race condition and yield will be called
							if (yieldCalled || (result && yield_)) {
								return /** @type {ResolveContextYield} */ (finishYield)(
									/** @type {ResolveRequest} */ (result)
								);
							}

							return finishWithoutResolve(log);
						}
					);
				}
			);
		}
	}

	/**
	 * @param {ResolveStepHook} hook hook
	 * @param {ResolveRequest} request request
	 * @param {null|string} message string
	 * @param {ResolveContext} resolveContext resolver context
	 * @param {(err?: null|Error, result?: ResolveRequest) => void} callback callback
	 * @returns {void}
	 */
	doResolve(hook, request, message, resolveContext, callback) {
		const stackEntry = Resolver.createStackEntry(hook, request);

		/** @type {Set<string> | undefined} */
		let newStack;
		if (resolveContext.stack) {
			newStack = new Set(resolveContext.stack);
			if (resolveContext.stack.has(stackEntry)) {
				/**
				 * Prevent recursion
				 * @type {Error & {recursion?: boolean}}
				 */
				const recursionError = new Error(
					"Recursion in resolving\nStack:\n  " +
						Array.from(newStack).join("\n  ")
				);
				recursionError.recursion = true;
				if (resolveContext.log)
					resolveContext.log("abort resolving because of recursion");
				return callback(recursionError);
			}
			newStack.add(stackEntry);
		} else {
			newStack = new Set([stackEntry]);
		}
		this.hooks.resolveStep.call(hook, request);

		if (hook.isUsed()) {
			const innerContext = createInnerContext(
				{
					log: resolveContext.log,
					yield: resolveContext.yield,
					fileDependencies: resolveContext.fileDependencies,
					contextDependencies: resolveContext.contextDependencies,
					missingDependencies: resolveContext.missingDependencies,
					stack: newStack
				},
				message
			);
			return hook.callAsync(request, innerContext, (err, result) => {
				if (err) return callback(err);
				if (result) return callback(null, result);
				callback();
			});
		} else {
			callback();
		}
	}

	/**
	 * @param {string} identifier identifier
	 * @returns {ParsedIdentifier} parsed identifier
	 */
	parse(identifier) {
		const part = {
			request: "",
			query: "",
			fragment: "",
			module: false,
			directory: false,
			file: false,
			internal: false
		};

		const parsedIdentifier = parseIdentifier(identifier);

		if (!parsedIdentifier) return part;

		[part.request, part.query, part.fragment] = parsedIdentifier;

		if (part.request.length > 0) {
			part.internal = this.isPrivate(identifier);
			part.module = this.isModule(part.request);
			part.directory = this.isDirectory(part.request);
			if (part.directory) {
				part.request = part.request.slice(0, -1);
			}
		}

		return part;
	}

	/**
	 * @param {string} path path
	 * @returns {boolean} true, if the path is a module
	 */
	isModule(path) {
		return getType(path) === PathType.Normal;
	}

	/**
	 * @param {string} path path
	 * @returns {boolean} true, if the path is private
	 */
	isPrivate(path) {
		return getType(path) === PathType.Internal;
	}

	/**
	 * @param {string} path a path
	 * @returns {boolean} true, if the path is a directory path
	 */
	isDirectory(path) {
		return path.endsWith("/");
	}

	/**
	 * @param {string} path path
	 * @param {string} request request
	 * @returns {string} joined path
	 */
	join(path, request) {
		return join(path, request);
	}

	/**
	 * @param {string} path path
	 * @returns {string} normalized path
	 */
	normalize(path) {
		return normalize(path);
	}
}

module.exports = Resolver;