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/*
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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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var Resolver = require("./Resolver");
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var SyncAsyncFileSystemDecorator = require("./SyncAsyncFileSystemDecorator");
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var ParsePlugin = require("./ParsePlugin");
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var DescriptionFilePlugin = require("./DescriptionFilePlugin");
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var NextPlugin = require("./NextPlugin");
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var TryNextPlugin = require("./TryNextPlugin");
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var ModuleKindPlugin = require("./ModuleKindPlugin");
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var FileKindPlugin = require("./FileKindPlugin");
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var JoinRequestPlugin = require("./JoinRequestPlugin");
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var ModulesInHierachicDirectoriesPlugin = require("./ModulesInHierachicDirectoriesPlugin");
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var ModulesInRootPlugin = require("./ModulesInRootPlugin");
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var AliasPlugin = require("./AliasPlugin");
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var AliasFieldPlugin = require("./AliasFieldPlugin");
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var ConcordExtensionsPlugin = require("./ConcordExtensionsPlugin");
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var ConcordMainPlugin = require("./ConcordMainPlugin");
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var ConcordModulesPlugin = require("./ConcordModulesPlugin");
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var DirectoryExistsPlugin = require("./DirectoryExistsPlugin");
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var FileExistsPlugin = require("./FileExistsPlugin");
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var SymlinkPlugin = require("./SymlinkPlugin");
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var MainFieldPlugin = require("./MainFieldPlugin");
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var UseFilePlugin = require("./UseFilePlugin");
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var AppendPlugin = require("./AppendPlugin");
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var ResultPlugin = require("./ResultPlugin");
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var ModuleAppendPlugin = require("./ModuleAppendPlugin");
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var 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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var modules = options.modules || ["node_modules"];
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// A list of description files to read from
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var 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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var plugins = (options.plugins && options.plugins.slice()) || [];
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// A list of main fields in description files
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var mainFields = options.mainFields || ["main"];
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// A list of alias fields in description files
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var aliasFields = options.aliasFields || [];
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// A list of main files in directories
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var mainFiles = options.mainFiles || ["index"];
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// A list of extensions which should be tried for files
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var extensions = options.extensions || [".js", ".json", ".node"];
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// Enforce that a extension from extensions must be used
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var enforceExtension = options.enforceExtension || false;
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// A list of module extensions which should be tried for modules
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var moduleExtensions = options.moduleExtensions || [];
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// Enforce that a extension from moduleExtensions must be used
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var 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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var alias = options.alias || [];
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// Resolve symlinks to their symlinked location
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var symlinks = typeof options.symlinks !== "undefined" ? options.symlinks : true;
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// Resolve to a context instead of a file
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var resolveToContext = options.resolveToContext || false;
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// Use this cache object to unsafely cache the successful requests
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var 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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var cacheWithContext = typeof options.cacheWithContext !== "undefined" ? options.cacheWithContext : true;
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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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var cachePredicate = options.cachePredicate || 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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var fileSystem = options.fileSystem;
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// Use only the sync variants of the file system calls
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var useSyncFileSystemCalls = options.useSyncFileSystemCalls;
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// A prepared Resolver to which the plugins are attached
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var resolver = options.resolver;
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//// options processing ////
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if(!resolver) {
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resolver = new Resolver(useSyncFileSystemCalls ? new SyncAsyncFileSystemDecorator(fileSystem) : fileSystem);
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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), function(item) {
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return !isAbsolutePath(item);
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});
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mainFields = mainFields.map(function(item) {
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if(typeof item === "string") {
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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(function(key) {
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var onlyModule = false;
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var 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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name: key,
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onlyModule: onlyModule
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}, obj);
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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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// resolve
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if(unsafeCache) {
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plugins.push(new UnsafeCachePlugin("resolve", cachePredicate, unsafeCache, cacheWithContext, "new-resolve"));
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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(new DescriptionFilePlugin("parsed-resolve", descriptionFiles, "described-resolve"));
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plugins.push(new NextPlugin("after-parsed-resolve", "described-resolve"));
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// described-resolve
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alias.forEach(function(item) {
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plugins.push(new AliasPlugin("described-resolve", item, "resolve"));
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});
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plugins.push(new ConcordModulesPlugin("described-resolve", {}, "resolve"));
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aliasFields.forEach(function(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(function(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(function(item) {
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if(Array.isArray(item))
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plugins.push(new ModulesInHierachicDirectoriesPlugin("module", item, "resolve"));
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else
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plugins.push(new ModulesInRootPlugin("module", item, "resolve"));
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});
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// relative
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plugins.push(new DescriptionFilePlugin("relative", descriptionFiles, "described-relative"));
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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(new TryNextPlugin("described-relative", "as directory", "directory"));
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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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plugins.push(new ConcordMainPlugin("existing-directory", {}, "resolve"));
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mainFields.forEach(function(item) {
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plugins.push(new MainFieldPlugin("existing-directory", item, "resolve"));
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});
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mainFiles.forEach(function(item) {
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plugins.push(new UseFilePlugin("existing-directory", item, "undescribed-raw-file"));
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});
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// undescribed-raw-file
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plugins.push(new DescriptionFilePlugin("undescribed-raw-file", descriptionFiles, "raw-file"));
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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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plugins.push(new ConcordExtensionsPlugin("raw-file", {}, "file"));
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extensions.forEach(function(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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alias.forEach(function(item) {
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plugins.push(new AliasPlugin("file", item, "resolve"));
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});
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plugins.push(new ConcordModulesPlugin("file", {}, "resolve"));
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aliasFields.forEach(function(item) {
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plugins.push(new AliasFieldPlugin("file", item, "resolve"));
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});
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if(symlinks)
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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("resolved"));
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//// RESOLVER ////
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plugins.forEach(function(plugin) {
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resolver.apply(plugin);
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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(function(array, item) {
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if(filter(item)) {
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var 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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