476 lines
13 KiB
JavaScript
Executable file
476 lines
13 KiB
JavaScript
Executable file
/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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Author Tobias Koppers @sokra
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*/
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"use strict";
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const { AsyncSeriesBailHook, AsyncSeriesHook, SyncHook } = require("tapable");
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const createInnerContext = require("./createInnerContext");
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const { parseIdentifier } = require("./util/identifier");
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const {
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normalize,
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cachedJoin: join,
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getType,
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PathType
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} = require("./util/path");
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/** @typedef {import("./ResolverFactory").ResolveOptions} ResolveOptions */
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/**
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* @typedef {Object} FileSystemStats
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* @property {function(): boolean} isDirectory
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* @property {function(): boolean} isFile
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*/
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/**
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* @typedef {Object} FileSystemDirent
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* @property {Buffer | string} name
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* @property {function(): boolean} isDirectory
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* @property {function(): boolean} isFile
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*/
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/**
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* @typedef {Object} PossibleFileSystemError
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* @property {string=} code
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* @property {number=} errno
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* @property {string=} path
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* @property {string=} syscall
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*/
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/**
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* @template T
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* @callback FileSystemCallback
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* @param {PossibleFileSystemError & Error | null | undefined} err
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* @param {T=} result
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*/
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/**
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* @typedef {Object} FileSystem
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* @property {(function(string, FileSystemCallback<Buffer | string>): void) & function(string, object, FileSystemCallback<Buffer | string>): void} readFile
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* @property {(function(string, FileSystemCallback<(Buffer | string)[] | FileSystemDirent[]>): void) & function(string, object, FileSystemCallback<(Buffer | string)[] | FileSystemDirent[]>): void} readdir
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* @property {((function(string, FileSystemCallback<object>): void) & function(string, object, FileSystemCallback<object>): void)=} readJson
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* @property {(function(string, FileSystemCallback<Buffer | string>): void) & function(string, object, FileSystemCallback<Buffer | string>): void} readlink
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* @property {(function(string, FileSystemCallback<FileSystemStats>): void) & function(string, object, FileSystemCallback<Buffer | string>): void=} lstat
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* @property {(function(string, FileSystemCallback<FileSystemStats>): void) & function(string, object, FileSystemCallback<Buffer | string>): void} stat
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*/
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/**
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* @typedef {Object} SyncFileSystem
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* @property {function(string, object=): Buffer | string} readFileSync
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* @property {function(string, object=): (Buffer | string)[] | FileSystemDirent[]} readdirSync
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* @property {(function(string, object=): object)=} readJsonSync
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* @property {function(string, object=): Buffer | string} readlinkSync
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* @property {function(string, object=): FileSystemStats=} lstatSync
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* @property {function(string, object=): FileSystemStats} statSync
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*/
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/**
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* @typedef {Object} ParsedIdentifier
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* @property {string} request
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* @property {string} query
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* @property {string} fragment
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* @property {boolean} directory
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* @property {boolean} module
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* @property {boolean} file
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* @property {boolean} internal
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*/
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/**
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* @typedef {Object} BaseResolveRequest
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* @property {string | false} path
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* @property {string=} descriptionFilePath
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* @property {string=} descriptionFileRoot
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* @property {object=} descriptionFileData
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* @property {string=} relativePath
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* @property {boolean=} ignoreSymlinks
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* @property {boolean=} fullySpecified
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*/
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/** @typedef {BaseResolveRequest & Partial<ParsedIdentifier>} ResolveRequest */
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/**
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* String with special formatting
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* @typedef {string} StackEntry
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*/
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/** @template T @typedef {{ add: (T) => void }} WriteOnlySet */
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/**
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* Resolve context
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* @typedef {Object} ResolveContext
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* @property {WriteOnlySet<string>=} contextDependencies
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* @property {WriteOnlySet<string>=} fileDependencies files that was found on file system
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* @property {WriteOnlySet<string>=} missingDependencies dependencies that was not found on file system
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* @property {Set<StackEntry>=} stack set of hooks' calls. For instance, `resolve → parsedResolve → describedResolve`,
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* @property {(function(string): void)=} log log function
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*/
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/** @typedef {AsyncSeriesBailHook<[ResolveRequest, ResolveContext], ResolveRequest | null>} ResolveStepHook */
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/**
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* @param {string} str input string
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* @returns {string} in camel case
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*/
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function toCamelCase(str) {
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return str.replace(/-([a-z])/g, str => str.substr(1).toUpperCase());
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}
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class Resolver {
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/**
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* @param {ResolveStepHook} hook hook
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* @param {ResolveRequest} request request
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* @returns {StackEntry} stack entry
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*/
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static createStackEntry(hook, request) {
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return (
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hook.name +
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": (" +
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request.path +
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") " +
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(request.request || "") +
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(request.query || "") +
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(request.fragment || "") +
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(request.directory ? " directory" : "") +
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(request.module ? " module" : "")
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);
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}
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/**
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* @param {FileSystem} fileSystem a filesystem
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* @param {ResolveOptions} options options
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*/
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constructor(fileSystem, options) {
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this.fileSystem = fileSystem;
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this.options = options;
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this.hooks = {
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/** @type {SyncHook<[ResolveStepHook, ResolveRequest], void>} */
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resolveStep: new SyncHook(["hook", "request"], "resolveStep"),
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/** @type {SyncHook<[ResolveRequest, Error]>} */
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noResolve: new SyncHook(["request", "error"], "noResolve"),
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/** @type {ResolveStepHook} */
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resolve: new AsyncSeriesBailHook(
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["request", "resolveContext"],
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"resolve"
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),
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/** @type {AsyncSeriesHook<[ResolveRequest, ResolveContext]>} */
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result: new AsyncSeriesHook(["result", "resolveContext"], "result")
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};
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}
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/**
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* @param {string | ResolveStepHook} name hook name or hook itself
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* @returns {ResolveStepHook} the hook
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*/
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ensureHook(name) {
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if (typeof name !== "string") {
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return name;
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}
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name = toCamelCase(name);
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if (/^before/.test(name)) {
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return /** @type {ResolveStepHook} */ (this.ensureHook(
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name[6].toLowerCase() + name.substr(7)
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).withOptions({
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stage: -10
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}));
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}
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if (/^after/.test(name)) {
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return /** @type {ResolveStepHook} */ (this.ensureHook(
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name[5].toLowerCase() + name.substr(6)
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).withOptions({
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stage: 10
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}));
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}
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const hook = this.hooks[name];
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if (!hook) {
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return (this.hooks[name] = new AsyncSeriesBailHook(
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["request", "resolveContext"],
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name
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));
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}
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return hook;
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}
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/**
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* @param {string | ResolveStepHook} name hook name or hook itself
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* @returns {ResolveStepHook} the hook
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*/
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getHook(name) {
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if (typeof name !== "string") {
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return name;
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}
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name = toCamelCase(name);
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if (/^before/.test(name)) {
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return /** @type {ResolveStepHook} */ (this.getHook(
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name[6].toLowerCase() + name.substr(7)
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).withOptions({
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stage: -10
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}));
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}
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if (/^after/.test(name)) {
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return /** @type {ResolveStepHook} */ (this.getHook(
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name[5].toLowerCase() + name.substr(6)
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).withOptions({
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stage: 10
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}));
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}
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const hook = this.hooks[name];
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if (!hook) {
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throw new Error(`Hook ${name} doesn't exist`);
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}
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return hook;
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}
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/**
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* @param {object} context context information object
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* @param {string} path context path
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* @param {string} request request string
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* @returns {string | false} result
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*/
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resolveSync(context, path, request) {
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/** @type {Error | null | undefined} */
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let err = undefined;
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/** @type {string | false | undefined} */
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let result = undefined;
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let sync = false;
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this.resolve(context, path, request, {}, (e, r) => {
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err = e;
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result = r;
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sync = true;
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});
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if (!sync) {
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throw new Error(
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"Cannot 'resolveSync' because the fileSystem is not sync. Use 'resolve'!"
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);
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}
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if (err) throw err;
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if (result === undefined) throw new Error("No result");
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return result;
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}
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/**
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* @param {object} context context information object
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* @param {string} path context path
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* @param {string} request request string
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* @param {ResolveContext} resolveContext resolve context
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* @param {function(Error | null, (string|false)=, ResolveRequest=): void} callback callback function
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* @returns {void}
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*/
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resolve(context, path, request, resolveContext, callback) {
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if (!context || typeof context !== "object")
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return callback(new Error("context argument is not an object"));
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if (typeof path !== "string")
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return callback(new Error("path argument is not a string"));
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if (typeof request !== "string")
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return callback(new Error("path argument is not a string"));
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if (!resolveContext)
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return callback(new Error("resolveContext argument is not set"));
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const obj = {
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context: context,
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path: path,
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request: request
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};
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const message = `resolve '${request}' in '${path}'`;
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const finishResolved = result => {
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return callback(
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null,
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result.path === false
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? false
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: `${result.path.replace(/#/g, "\0#")}${
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result.query ? result.query.replace(/#/g, "\0#") : ""
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}${result.fragment || ""}`,
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result
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);
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};
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const finishWithoutResolve = log => {
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/**
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* @type {Error & {details?: string}}
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*/
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const error = new Error("Can't " + message);
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error.details = log.join("\n");
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this.hooks.noResolve.call(obj, error);
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return callback(error);
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};
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if (resolveContext.log) {
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// We need log anyway to capture it in case of an error
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const parentLog = resolveContext.log;
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const log = [];
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return this.doResolve(
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this.hooks.resolve,
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obj,
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message,
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{
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log: msg => {
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parentLog(msg);
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log.push(msg);
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},
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fileDependencies: resolveContext.fileDependencies,
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contextDependencies: resolveContext.contextDependencies,
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missingDependencies: resolveContext.missingDependencies,
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stack: resolveContext.stack
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},
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(err, result) => {
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if (err) return callback(err);
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if (result) return finishResolved(result);
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return finishWithoutResolve(log);
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}
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);
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} else {
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// Try to resolve assuming there is no error
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// We don't log stuff in this case
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return this.doResolve(
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this.hooks.resolve,
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obj,
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message,
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{
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log: undefined,
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fileDependencies: resolveContext.fileDependencies,
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contextDependencies: resolveContext.contextDependencies,
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missingDependencies: resolveContext.missingDependencies,
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stack: resolveContext.stack
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},
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(err, result) => {
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if (err) return callback(err);
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if (result) return finishResolved(result);
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// log is missing for the error details
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// so we redo the resolving for the log info
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// this is more expensive to the success case
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// is assumed by default
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const log = [];
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return this.doResolve(
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this.hooks.resolve,
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obj,
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message,
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{
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log: msg => log.push(msg),
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stack: resolveContext.stack
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},
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(err, result) => {
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if (err) return callback(err);
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return finishWithoutResolve(log);
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}
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);
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}
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);
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}
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}
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doResolve(hook, request, message, resolveContext, callback) {
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const stackEntry = Resolver.createStackEntry(hook, request);
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let newStack;
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if (resolveContext.stack) {
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newStack = new Set(resolveContext.stack);
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if (resolveContext.stack.has(stackEntry)) {
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/**
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* Prevent recursion
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* @type {Error & {recursion?: boolean}}
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*/
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const recursionError = new Error(
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"Recursion in resolving\nStack:\n " +
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Array.from(newStack).join("\n ")
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);
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recursionError.recursion = true;
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if (resolveContext.log)
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resolveContext.log("abort resolving because of recursion");
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return callback(recursionError);
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}
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newStack.add(stackEntry);
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} else {
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newStack = new Set([stackEntry]);
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}
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this.hooks.resolveStep.call(hook, request);
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if (hook.isUsed()) {
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const innerContext = createInnerContext(
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{
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log: resolveContext.log,
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fileDependencies: resolveContext.fileDependencies,
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contextDependencies: resolveContext.contextDependencies,
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missingDependencies: resolveContext.missingDependencies,
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stack: newStack
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},
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message
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);
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return hook.callAsync(request, innerContext, (err, result) => {
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if (err) return callback(err);
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if (result) return callback(null, result);
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callback();
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});
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} else {
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callback();
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}
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}
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/**
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* @param {string} identifier identifier
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* @returns {ParsedIdentifier} parsed identifier
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*/
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parse(identifier) {
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const part = {
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request: "",
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query: "",
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fragment: "",
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module: false,
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directory: false,
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file: false,
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internal: false
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};
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const parsedIdentifier = parseIdentifier(identifier);
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if (!parsedIdentifier) return part;
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[part.request, part.query, part.fragment] = parsedIdentifier;
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if (part.request.length > 0) {
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part.internal = this.isPrivate(identifier);
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part.module = this.isModule(part.request);
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part.directory = this.isDirectory(part.request);
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if (part.directory) {
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part.request = part.request.substr(0, part.request.length - 1);
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}
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}
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return part;
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}
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isModule(path) {
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return getType(path) === PathType.Normal;
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}
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isPrivate(path) {
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return getType(path) === PathType.Internal;
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}
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/**
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* @param {string} path a path
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* @returns {boolean} true, if the path is a directory path
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*/
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isDirectory(path) {
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return path.endsWith("/");
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}
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join(path, request) {
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return join(path, request);
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}
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normalize(path) {
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return normalize(path);
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}
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}
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module.exports = Resolver;
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