exports.getDirectory = function()

in src/browser/FileProxy.js [351:426]
49 lines of code
22 McCabe index (conditional complexity)

        exports.getDirectory = function (successCallback, errorCallback, args) {
            const fullPath = args[0];
            let path = args[1];
            let options = args[2];

            // Create an absolute path if we were handed a relative one.
            path = resolveToFullPath_(fullPath, path);

            idb_.get(path.storagePath, function (folderEntry) {
                if (!options) {
                    options = {};
                }

                if (options.create === true && options.exclusive === true && folderEntry) {
                    // If create and exclusive are both true, and the path already exists,
                    // getDirectory must fail.
                    if (errorCallback) {
                        errorCallback(FileError.PATH_EXISTS_ERR);
                    }
                    // There is a strange bug in mobilespec + FF, which results in coming to multiple else-if's
                    // so we are shielding from it with returns.
                    return;
                }

                if (options.create === true && !folderEntry) {
                    // If create is true, the path doesn't exist, and no other error occurs,
                    // getDirectory must create it as a zero-length file and return a corresponding
                    // MyDirectoryEntry.
                    const dirEntry = new DirectoryEntry(path.fileName, path.fullPath, new FileSystem(path.fsName, fs_.root));

                    idb_.put(dirEntry, path.storagePath, successCallback, errorCallback);
                    return;
                }

                if (options.create === true && folderEntry) {
                    if (folderEntry.isDirectory) {
                        // IDB won't save methods, so we need re-create the MyDirectoryEntry.
                        successCallback(new DirectoryEntry(folderEntry.name, folderEntry.fullPath, folderEntry.filesystem));
                    } else {
                        if (errorCallback) {
                            errorCallback(FileError.INVALID_MODIFICATION_ERR);
                        }
                    }
                    return;
                }

                if ((!options.create || options.create === false) && !folderEntry) {
                    // Handle root special. It should always exist.
                    if (path.fullPath === DIR_SEPARATOR) {
                        successCallback(fs_.root);
                        return;
                    }

                    // If create is not true and the path doesn't exist, getDirectory must fail.
                    if (errorCallback) {
                        errorCallback(FileError.NOT_FOUND_ERR);
                    }

                    return;
                }
                if ((!options.create || options.create === false) && folderEntry && folderEntry.isFile) {
                    // If create is not true and the path exists, but is a file, getDirectory
                    // must fail.
                    if (errorCallback) {
                        errorCallback(FileError.TYPE_MISMATCH_ERR);
                    }
                    return;
                }

                // Otherwise, if no other error occurs, getDirectory must return a
                // MyDirectoryEntry corresponding to path.

                // IDB won't' save methods, so we need re-create MyDirectoryEntry.
                successCallback(new DirectoryEntry(folderEntry.name, folderEntry.fullPath, folderEntry.filesystem));
            }, errorCallback);
        };