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contexts from './contexts';\nimport Parser from './parser/parser';\nimport LessError from './less-error';\nimport * as utils from './utils';\nimport logger from './logger';\n\nexport default function(environment) {\n    // FileInfo = {\n    //  'rewriteUrls' - option - whether to adjust URL's to be relative\n    //  'filename' - full resolved filename of current file\n    //  'rootpath' - path to append to normal URLs for this node\n    //  'currentDirectory' - path to the current file, absolute\n    //  'rootFilename' - filename of the base file\n    //  'entryPath' - absolute path to the entry file\n    //  'reference' - whether the file should not be output and only output parts that are referenced\n\n    class ImportManager {\n        constructor(less, context, rootFileInfo) {\n            this.less = less;\n            this.rootFilename = rootFileInfo.filename;\n            this.paths = context.paths || [];  // Search paths, when importing\n            this.contents = {};             // map - filename to contents of all the files\n            this.contentsIgnoredChars = {}; // map - filename to lines at the beginning of each file to ignore\n            this.mime = context.mime;\n            this.error = null;\n            this.context = context;\n            // Deprecated? Unused outside of here, could be useful.\n            this.queue = [];        // Files which haven't been imported yet\n            this.files = {};        // Holds the imported parse trees.\n        }\n\n        /**\n         * Add an import to be imported\n         * @param path - the raw path\n         * @param tryAppendExtension - whether to try appending a file extension (.less or .js if the path has no extension)\n         * @param currentFileInfo - the current file info (used for instance to work out relative paths)\n         * @param importOptions - import options\n         * @param callback - callback for when it is imported\n         */\n        push(path, tryAppendExtension, currentFileInfo, importOptions, callback) {\n            const importManager = this, pluginLoader = this.context.pluginManager.Loader;\n\n            this.queue.push(path);\n\n            const fileParsedFunc = function (e, root, fullPath) {\n                importManager.queue.splice(importManager.queue.indexOf(path), 1); // Remove the path from the queue\n\n                const importedEqualsRoot = fullPath === importManager.rootFilename;\n                if (importOptions.optional && e) {\n                    callback(null, {rules:[]}, false, null);\n                    logger.info(`The file ${fullPath} was skipped because it was not found and the import was marked optional.`);\n                }\n                else {\n                    // Inline imports aren't cached here.\n                    // If we start to cache them, please make sure they won't conflict with non-inline imports of the\n                    // same name as they used to do before this comment and the condition below have been added.\n                    if (!importManager.files[fullPath] && !importOptions.inline) {\n                        importManager.files[fullPath] = { root, options: importOptions };\n                    }\n                    if (e && !importManager.error) { importManager.error = e; }\n                    callback(e, root, importedEqualsRoot, fullPath);\n                }\n            };\n\n            const newFileInfo = {\n                rewriteUrls: this.context.rewriteUrls,\n                entryPath: currentFileInfo.entryPath,\n                rootpath: currentFileInfo.rootpath,\n                rootFilename: currentFileInfo.rootFilename\n            };\n\n            const fileManager = environment.getFileManager(path, currentFileInfo.currentDirectory, this.context, environment);\n\n            if (!fileManager) {\n                fileParsedFunc({ message: `Could not find a file-manager for ${path}` });\n                return;\n            }\n\n            const loadFileCallback = function(loadedFile) {\n                let plugin;\n                const resolvedFilename = loadedFile.filename;\n                const contents = loadedFile.contents.replace(/^\\uFEFF/, '');\n\n                // Pass on an updated rootpath if path of imported file is relative and file\n                // is in a (sub|sup) directory\n                //\n                // Examples:\n                // - If path of imported file is 'module/nav/nav.less' and rootpath is 'less/',\n                //   then rootpath should become 'less/module/nav/'\n                // - If path of imported file is '../mixins.less' and rootpath is 'less/',\n                //   then rootpath should become 'less/../'\n                newFileInfo.currentDirectory = fileManager.getPath(resolvedFilename);\n                if (newFileInfo.rewriteUrls) {\n                    newFileInfo.rootpath = fileManager.join(\n                        (importManager.context.rootpath || ''),\n                        fileManager.pathDiff(newFileInfo.currentDirectory, newFileInfo.entryPath));\n\n                    if (!fileManager.isPathAbsolute(newFileInfo.rootpath) && fileManager.alwaysMakePathsAbsolute()) {\n                        newFileInfo.rootpath = fileManager.join(newFileInfo.entryPath, newFileInfo.rootpath);\n                    }\n                }\n                newFileInfo.filename = resolvedFilename;\n\n                const newEnv = new contexts.Parse(importManager.context);\n\n                newEnv.processImports = false;\n                importManager.contents[resolvedFilename] = contents;\n\n                if (currentFileInfo.reference || importOptions.reference) {\n                    newFileInfo.reference = true;\n                }\n\n                if (importOptions.isPlugin) {\n                    plugin = pluginLoader.evalPlugin(contents, newEnv, importManager, importOptions.pluginArgs, newFileInfo);\n                    if (plugin instanceof LessError) {\n                        fileParsedFunc(plugin, null, resolvedFilename);\n                    }\n                    else {\n                        fileParsedFunc(null, plugin, resolvedFilename);\n                    }\n                } else if (importOptions.inline) {\n                    fileParsedFunc(null, contents, resolvedFilename);\n                } else {\n                    // import (multiple) parse trees apparently get altered and can't be cached.\n                    // TODO: investigate why this is\n                    if (importManager.files[resolvedFilename]\n                        && !importManager.files[resolvedFilename].options.multiple\n                        && !importOptions.multiple) {\n\n                        fileParsedFunc(null, importManager.files[resolvedFilename].root, resolvedFilename);\n                    }\n                    else {\n                        new Parser(newEnv, importManager, newFileInfo).parse(contents, function (e, root) {\n                            fileParsedFunc(e, root, resolvedFilename);\n                        });\n                    }\n                }\n            };\n            let loadedFile;\n            let promise;\n            const context = utils.clone(this.context);\n\n            if (tryAppendExtension) {\n                context.ext = importOptions.isPlugin ? '.js' : '.less';\n            }\n\n            if (importOptions.isPlugin) {\n                context.mime = 'application/javascript';\n\n                if (context.syncImport) {\n                    loadedFile = pluginLoader.loadPluginSync(path, currentFileInfo.currentDirectory, context, environment, fileManager);\n                } else {\n                    promise = pluginLoader.loadPlugin(path, currentFileInfo.currentDirectory, context, environment, fileManager);\n                }\n            }\n            else {\n                if (context.syncImport) {\n                    loadedFile = fileManager.loadFileSync(path, currentFileInfo.currentDirectory, context, environment);\n                } else {\n                    promise = fileManager.loadFile(path, currentFileInfo.currentDirectory, context, environment,\n                        (err, loadedFile) => {\n                            if (err) {\n                                fileParsedFunc(err);\n                            } else {\n                                loadFileCallback(loadedFile);\n                            }\n                        });\n                }\n            }\n            if (loadedFile) {\n                if (!loadedFile.filename) {\n                    fileParsedFunc(loadedFile);\n                } else {\n                    loadFileCallback(loadedFile);\n                }\n            } else if (promise) {\n                promise.then(loadFileCallback, fileParsedFunc);\n            }\n        }\n    }\n\n    return ImportManager;\n};\n"]}