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339 lines
9.7 KiB
339 lines
9.7 KiB
/*
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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 Resolver = require("./Resolver");
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const SyncAsyncFileSystemDecorator = require("./SyncAsyncFileSystemDecorator");
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const ParsePlugin = require("./ParsePlugin");
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const DescriptionFilePlugin = require("./DescriptionFilePlugin");
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const NextPlugin = require("./NextPlugin");
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const TryNextPlugin = require("./TryNextPlugin");
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const ModuleKindPlugin = require("./ModuleKindPlugin");
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const FileKindPlugin = require("./FileKindPlugin");
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const JoinRequestPlugin = require("./JoinRequestPlugin");
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const ModulesInHierachicDirectoriesPlugin = require("./ModulesInHierachicDirectoriesPlugin");
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const ModulesInRootPlugin = require("./ModulesInRootPlugin");
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const AliasPlugin = require("./AliasPlugin");
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const AliasFieldPlugin = require("./AliasFieldPlugin");
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const ConcordExtensionsPlugin = require("./ConcordExtensionsPlugin");
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const ConcordMainPlugin = require("./ConcordMainPlugin");
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const ConcordModulesPlugin = require("./ConcordModulesPlugin");
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const DirectoryExistsPlugin = require("./DirectoryExistsPlugin");
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const FileExistsPlugin = require("./FileExistsPlugin");
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const SymlinkPlugin = require("./SymlinkPlugin");
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const MainFieldPlugin = require("./MainFieldPlugin");
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const UseFilePlugin = require("./UseFilePlugin");
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const AppendPlugin = require("./AppendPlugin");
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const ResultPlugin = require("./ResultPlugin");
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const ModuleAppendPlugin = require("./ModuleAppendPlugin");
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const UnsafeCachePlugin = require("./UnsafeCachePlugin");
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exports.createResolver = function(options) {
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//// OPTIONS ////
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// A list of directories to resolve modules from, can be absolute path or folder name
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let modules = options.modules || ["node_modules"];
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// A list of description files to read from
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const descriptionFiles = options.descriptionFiles || ["package.json"];
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// A list of additional resolve plugins which should be applied
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// The slice is there to create a copy, because otherwise pushing into plugins
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// changes the original options.plugins array, causing duplicate plugins
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const plugins = (options.plugins && options.plugins.slice()) || [];
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// A list of main fields in description files
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let mainFields = options.mainFields || ["main"];
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// A list of alias fields in description files
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const aliasFields = options.aliasFields || [];
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// A list of main files in directories
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const mainFiles = options.mainFiles || ["index"];
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// A list of extensions which should be tried for files
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let extensions = options.extensions || [".js", ".json", ".node"];
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// Enforce that a extension from extensions must be used
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const enforceExtension = options.enforceExtension || false;
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// A list of module extensions which should be tried for modules
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let moduleExtensions = options.moduleExtensions || [];
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// Enforce that a extension from moduleExtensions must be used
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const enforceModuleExtension = options.enforceModuleExtension || false;
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// A list of module alias configurations or an object which maps key to value
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let alias = options.alias || [];
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// Resolve symlinks to their symlinked location
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const symlinks =
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typeof options.symlinks !== "undefined" ? options.symlinks : true;
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// Resolve to a context instead of a file
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const resolveToContext = options.resolveToContext || false;
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// Use this cache object to unsafely cache the successful requests
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let unsafeCache = options.unsafeCache || false;
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// Whether or not the unsafeCache should include request context as part of the cache key.
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const cacheWithContext =
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typeof options.cacheWithContext !== "undefined"
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? options.cacheWithContext
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: true;
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// Enable concord description file instructions
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const enableConcord = options.concord || false;
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// A function which decides whether a request should be cached or not.
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// an object is passed with `path` and `request` properties.
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const cachePredicate =
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options.cachePredicate ||
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function() {
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return true;
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};
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// The file system which should be used
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const fileSystem = options.fileSystem;
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// Use only the sync constiants of the file system calls
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const useSyncFileSystemCalls = options.useSyncFileSystemCalls;
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// A prepared Resolver to which the plugins are attached
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let resolver = options.resolver;
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//// options processing ////
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if (!resolver) {
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resolver = new Resolver(
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useSyncFileSystemCalls
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? new SyncAsyncFileSystemDecorator(fileSystem)
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: fileSystem
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);
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}
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extensions = [].concat(extensions);
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moduleExtensions = [].concat(moduleExtensions);
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modules = mergeFilteredToArray([].concat(modules), item => {
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return !isAbsolutePath(item);
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});
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mainFields = mainFields.map(item => {
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if (typeof item === "string" || Array.isArray(item)) {
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item = {
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name: item,
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forceRelative: true
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};
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}
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return item;
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});
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if (typeof alias === "object" && !Array.isArray(alias)) {
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alias = Object.keys(alias).map(key => {
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let onlyModule = false;
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let obj = alias[key];
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if (/\$$/.test(key)) {
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onlyModule = true;
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key = key.substr(0, key.length - 1);
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}
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if (typeof obj === "string") {
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obj = {
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alias: obj
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};
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}
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obj = Object.assign(
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{
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name: key,
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onlyModule: onlyModule
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},
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obj
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);
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return obj;
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});
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}
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if (unsafeCache && typeof unsafeCache !== "object") {
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unsafeCache = {};
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}
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//// pipeline ////
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resolver.ensureHook("resolve");
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resolver.ensureHook("parsedResolve");
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resolver.ensureHook("describedResolve");
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resolver.ensureHook("rawModule");
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resolver.ensureHook("module");
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resolver.ensureHook("relative");
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resolver.ensureHook("describedRelative");
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resolver.ensureHook("directory");
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resolver.ensureHook("existingDirectory");
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resolver.ensureHook("undescribedRawFile");
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resolver.ensureHook("rawFile");
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resolver.ensureHook("file");
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resolver.ensureHook("existingFile");
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resolver.ensureHook("resolved");
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// resolve
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if (unsafeCache) {
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plugins.push(
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new UnsafeCachePlugin(
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"resolve",
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cachePredicate,
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unsafeCache,
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cacheWithContext,
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"new-resolve"
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)
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);
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plugins.push(new ParsePlugin("new-resolve", "parsed-resolve"));
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} else {
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plugins.push(new ParsePlugin("resolve", "parsed-resolve"));
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}
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// parsed-resolve
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plugins.push(
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new DescriptionFilePlugin(
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"parsed-resolve",
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descriptionFiles,
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"described-resolve"
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)
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);
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plugins.push(new NextPlugin("after-parsed-resolve", "described-resolve"));
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// described-resolve
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if (alias.length > 0)
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plugins.push(new AliasPlugin("described-resolve", alias, "resolve"));
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if (enableConcord) {
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plugins.push(new ConcordModulesPlugin("described-resolve", {}, "resolve"));
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}
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aliasFields.forEach(item => {
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plugins.push(new AliasFieldPlugin("described-resolve", item, "resolve"));
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});
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plugins.push(new ModuleKindPlugin("after-described-resolve", "raw-module"));
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plugins.push(new JoinRequestPlugin("after-described-resolve", "relative"));
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// raw-module
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moduleExtensions.forEach(item => {
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plugins.push(new ModuleAppendPlugin("raw-module", item, "module"));
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});
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if (!enforceModuleExtension)
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plugins.push(new TryNextPlugin("raw-module", null, "module"));
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// module
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modules.forEach(item => {
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if (Array.isArray(item))
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plugins.push(
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new ModulesInHierachicDirectoriesPlugin("module", item, "resolve")
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);
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else plugins.push(new ModulesInRootPlugin("module", item, "resolve"));
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});
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// relative
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plugins.push(
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new DescriptionFilePlugin(
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"relative",
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descriptionFiles,
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"described-relative"
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)
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);
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plugins.push(new NextPlugin("after-relative", "described-relative"));
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// described-relative
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plugins.push(new FileKindPlugin("described-relative", "raw-file"));
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plugins.push(
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new TryNextPlugin("described-relative", "as directory", "directory")
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);
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// directory
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plugins.push(new DirectoryExistsPlugin("directory", "existing-directory"));
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if (resolveToContext) {
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// existing-directory
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plugins.push(new NextPlugin("existing-directory", "resolved"));
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} else {
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// existing-directory
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if (enableConcord) {
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plugins.push(new ConcordMainPlugin("existing-directory", {}, "resolve"));
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}
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mainFields.forEach(item => {
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plugins.push(new MainFieldPlugin("existing-directory", item, "resolve"));
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});
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mainFiles.forEach(item => {
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plugins.push(
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new UseFilePlugin("existing-directory", item, "undescribed-raw-file")
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);
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});
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// undescribed-raw-file
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plugins.push(
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new DescriptionFilePlugin(
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"undescribed-raw-file",
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descriptionFiles,
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"raw-file"
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)
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);
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plugins.push(new NextPlugin("after-undescribed-raw-file", "raw-file"));
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// raw-file
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if (!enforceExtension) {
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plugins.push(new TryNextPlugin("raw-file", "no extension", "file"));
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}
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if (enableConcord) {
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plugins.push(new ConcordExtensionsPlugin("raw-file", {}, "file"));
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}
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extensions.forEach(item => {
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plugins.push(new AppendPlugin("raw-file", item, "file"));
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});
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// file
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if (alias.length > 0)
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plugins.push(new AliasPlugin("file", alias, "resolve"));
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if (enableConcord) {
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plugins.push(new ConcordModulesPlugin("file", {}, "resolve"));
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}
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aliasFields.forEach(item => {
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plugins.push(new AliasFieldPlugin("file", item, "resolve"));
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});
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if (symlinks) plugins.push(new SymlinkPlugin("file", "relative"));
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plugins.push(new FileExistsPlugin("file", "existing-file"));
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// existing-file
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plugins.push(new NextPlugin("existing-file", "resolved"));
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}
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// resolved
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plugins.push(new ResultPlugin(resolver.hooks.resolved));
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//// RESOLVER ////
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plugins.forEach(plugin => {
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plugin.apply(resolver);
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});
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return resolver;
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};
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function mergeFilteredToArray(array, filter) {
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return array.reduce((array, item) => {
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if (filter(item)) {
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const lastElement = array[array.length - 1];
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if (Array.isArray(lastElement)) {
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lastElement.push(item);
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} else {
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array.push([item]);
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}
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return array;
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} else {
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array.push(item);
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return array;
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}
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}, []);
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}
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function isAbsolutePath(path) {
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return /^[A-Z]:|^\//.test(path);
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}
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