browserfs
Version:
A filesystem in your browser!
207 lines • 31.6 kB
JavaScript
"use strict";
var node_fs_stats_1 = require('../core/node_fs_stats');
var path = require('path');
var FileIndex = (function () {
function FileIndex() {
this._index = {};
this.addPath('/', new DirInode());
}
FileIndex.prototype._split_path = function (p) {
var dirpath = path.dirname(p);
var itemname = p.substr(dirpath.length + (dirpath === "/" ? 0 : 1));
return [dirpath, itemname];
};
FileIndex.prototype.fileIterator = function (cb) {
for (var path in this._index) {
var dir = this._index[path];
var files = dir.getListing();
for (var i = 0; i < files.length; i++) {
var item = dir.getItem(files[i]);
if (isFileInode(item)) {
cb(item.getData());
}
}
}
};
FileIndex.prototype.addPath = function (path, inode) {
if (inode == null) {
throw new Error('Inode must be specified');
}
if (path[0] !== '/') {
throw new Error('Path must be absolute, got: ' + path);
}
if (this._index.hasOwnProperty(path)) {
return this._index[path] === inode;
}
var splitPath = this._split_path(path);
var dirpath = splitPath[0];
var itemname = splitPath[1];
var parent = this._index[dirpath];
if (parent === undefined && path !== '/') {
parent = new DirInode();
if (!this.addPath(dirpath, parent)) {
return false;
}
}
if (path !== '/') {
if (!parent.addItem(itemname, inode)) {
return false;
}
}
if (isDirInode(inode)) {
this._index[path] = inode;
}
return true;
};
FileIndex.prototype.addPathFast = function (path, inode) {
var itemNameMark = path.lastIndexOf('/');
var parentPath = itemNameMark == 0 ? "/" : path.substring(0, itemNameMark);
var itemName = path.substring(itemNameMark + 1);
var parent = this._index[parentPath];
if (parent === undefined) {
parent = new DirInode();
this.addPathFast(parentPath, parent);
}
if (!parent.addItem(itemName, inode)) {
return false;
}
if (inode.isDir()) {
this._index[path] = inode;
}
return true;
};
FileIndex.prototype.removePath = function (path) {
var splitPath = this._split_path(path);
var dirpath = splitPath[0];
var itemname = splitPath[1];
var parent = this._index[dirpath];
if (parent === undefined) {
return null;
}
var inode = parent.remItem(itemname);
if (inode === null) {
return null;
}
if (isDirInode(inode)) {
var children = inode.getListing();
for (var i = 0; i < children.length; i++) {
this.removePath(path + '/' + children[i]);
}
if (path !== '/') {
delete this._index[path];
}
}
return inode;
};
FileIndex.prototype.ls = function (path) {
var item = this._index[path];
if (item === undefined) {
return null;
}
return item.getListing();
};
FileIndex.prototype.getInode = function (path) {
var splitPath = this._split_path(path);
var dirpath = splitPath[0];
var itemname = splitPath[1];
var parent = this._index[dirpath];
if (parent === undefined) {
return null;
}
if (dirpath === path) {
return parent;
}
return parent.getItem(itemname);
};
FileIndex.fromListing = function (listing) {
var idx = new FileIndex();
var rootInode = new DirInode();
idx._index['/'] = rootInode;
var queue = [['', listing, rootInode]];
while (queue.length > 0) {
var inode;
var next = queue.pop();
var pwd = next[0];
var tree = next[1];
var parent = next[2];
for (var node in tree) {
var children = tree[node];
var name = "" + pwd + "/" + node;
if (children != null) {
idx._index[name] = inode = new DirInode();
queue.push([name, children, inode]);
}
else {
inode = new FileInode(new node_fs_stats_1["default"](node_fs_stats_1.FileType.FILE, -1, 0x16D));
}
if (parent != null) {
parent._ls[node] = inode;
}
}
}
return idx;
};
return FileIndex;
}());
exports.FileIndex = FileIndex;
var FileInode = (function () {
function FileInode(data) {
this.data = data;
}
FileInode.prototype.isFile = function () { return true; };
FileInode.prototype.isDir = function () { return false; };
FileInode.prototype.getData = function () { return this.data; };
FileInode.prototype.setData = function (data) { this.data = data; };
return FileInode;
}());
exports.FileInode = FileInode;
var DirInode = (function () {
function DirInode(data) {
if (data === void 0) { data = null; }
this.data = data;
this._ls = {};
}
DirInode.prototype.isFile = function () {
return false;
};
DirInode.prototype.isDir = function () {
return true;
};
DirInode.prototype.getData = function () { return this.data; };
DirInode.prototype.getStats = function () {
return new node_fs_stats_1["default"](node_fs_stats_1.FileType.DIRECTORY, 4096, 0x16D);
};
DirInode.prototype.getListing = function () {
return Object.keys(this._ls);
};
DirInode.prototype.getItem = function (p) {
var _ref;
return (_ref = this._ls[p]) != null ? _ref : null;
};
DirInode.prototype.addItem = function (p, inode) {
if (p in this._ls) {
return false;
}
this._ls[p] = inode;
return true;
};
DirInode.prototype.remItem = function (p) {
var item = this._ls[p];
if (item === undefined) {
return null;
}
delete this._ls[p];
return item;
};
return DirInode;
}());
exports.DirInode = DirInode;
function isFileInode(inode) {
return inode && inode.isFile();
}
exports.isFileInode = isFileInode;
function isDirInode(inode) {
return inode && inode.isDir();
}
exports.isDirInode = isDirInode;
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{default as Stats, FileType} from '../core/node_fs_stats';\nimport path = require('path');\n\n/**\n * A simple class for storing a filesystem index. Assumes that all paths passed\n * to it are *absolute* paths.\n *\n * Can be used as a partial or a full index, although care must be taken if used\n * for the former purpose, especially when directories are concerned.\n */\nexport class FileIndex<T> {\n  // Maps directory paths to directory inodes, which contain files.\n  private _index: {[path: string]: DirInode<T>}\n\n  /**\n   * Constructs a new FileIndex.\n   */\n  constructor() {\n    // _index is a single-level key,value store that maps *directory* paths to\n    // DirInodes. File information is only contained in DirInodes themselves.\n    this._index = {};\n    // Create the root directory.\n    this.addPath('/', new DirInode());\n  }\n\n  /**\n   * Split into a (directory path, item name) pair\n   */\n  private _split_path(p: string): string[] {\n    var dirpath = path.dirname(p);\n    var itemname = p.substr(dirpath.length + (dirpath === \"/\" ? 0 : 1));\n    return [dirpath, itemname];\n  }\n\n  /**\n   * Runs the given function over all files in the index.\n   */\n  public fileIterator<T>(cb: (file: T) => void): void {\n    for (var path in this._index) {\n      var dir = this._index[path];\n      var files = dir.getListing();\n      for (var i = 0; i < files.length; i++) {\n        var item = dir.getItem(files[i]);\n        if (isFileInode<T>(item)) {\n          cb(item.getData());\n        }\n      }\n    }\n  }\n\n  /**\n   * Adds the given absolute path to the index if it is not already in the index.\n   * Creates any needed parent directories.\n   * @param [String] path The path to add to the index.\n   * @param [BrowserFS.FileInode | BrowserFS.DirInode] inode The inode for the\n   *   path to add.\n   * @return [Boolean] 'True' if it was added or already exists, 'false' if there\n   *   was an issue adding it (e.g. item in path is a file, item exists but is\n   *   different).\n   * @todo If adding fails and implicitly creates directories, we do not clean up\n   *   the new empty directories.\n   */\n  public addPath(path: string, inode: Inode): boolean {\n    if (inode == null) {\n      throw new Error('Inode must be specified');\n    }\n    if (path[0] !== '/') {\n      throw new Error('Path must be absolute, got: ' + path);\n    }\n\n    // Check if it already exists.\n    if (this._index.hasOwnProperty(path)) {\n      return this._index[path] === inode;\n    }\n\n    var splitPath = this._split_path(path);\n    var dirpath = splitPath[0];\n    var itemname = splitPath[1];\n    // Try to add to its parent directory first.\n    var parent = this._index[dirpath];\n    if (parent === undefined && path !== '/') {\n      // Create parent.\n      parent = new DirInode<T>();\n      if (!this.addPath(dirpath, parent)) {\n        return false;\n      }\n    }\n    // Add myself to my parent.\n    if (path !== '/') {\n      if (!parent.addItem(itemname, inode)) {\n        return false;\n      }\n    }\n    // If I'm a directory, add myself to the index.\n    if (isDirInode<T>(inode)) {\n      this._index[path] = inode;\n    }\n    return true;\n  }\n\n  /**\n   * Adds the given absolute path to the index if it is not already in the index.\n   * The path is added without special treatment (no joining of adjacent separators, etc).\n   * Creates any needed parent directories.\n   * @param [String] path The path to add to the index.\n   * @param [BrowserFS.FileInode | BrowserFS.DirInode] inode The inode for the\n   *   path to add.\n   * @return [Boolean] 'True' if it was added or already exists, 'false' if there\n   *   was an issue adding it (e.g. item in path is a file, item exists but is\n   *   different).\n   * @todo If adding fails and implicitly creates directories, we do not clean up\n   *   the new empty directories.\n   */\n  public addPathFast(path: string, inode: Inode): boolean {\n\n    const itemNameMark = path.lastIndexOf('/');\n    const parentPath = itemNameMark == 0 ? \"/\" : path.substring(0, itemNameMark);\n    const itemName = path.substring(itemNameMark+1);\n\n    // Try to add to its parent directory first.\n    let parent = this._index[parentPath];\n    if (parent === undefined) {\n      // Create parent.\n      parent = new DirInode<T>();\n      this.addPathFast(parentPath, parent);\n    }\n\n    if (!parent.addItem(itemName, inode)) {\n      return false;\n    }\n\n    // If adding a directory, add to the index as well.\n    if (inode.isDir()) {\n      this._index[path] = <DirInode<T>> inode;\n    }\n    return true;\n  }\n\n  /**\n   * Removes the given path. Can be a file or a directory.\n   * @return [BrowserFS.FileInode | BrowserFS.DirInode | null] The removed item,\n   *   or null if it did not exist.\n   */\n  public removePath(path: string): Inode {\n    var splitPath = this._split_path(path);\n    var dirpath = splitPath[0];\n    var itemname = splitPath[1];\n\n    // Try to remove it from its parent directory first.\n    var parent = this._index[dirpath];\n    if (parent === undefined) {\n      return null;\n    }\n    // Remove myself from my parent.\n    var inode = parent.remItem(itemname);\n    if (inode === null) {\n      return null;\n    }\n    // If I'm a directory, remove myself from the index, and remove my children.\n    if (isDirInode(inode)) {\n      var children = inode.getListing();\n      for (var i = 0; i < children.length; i++) {\n        this.removePath(path + '/' + children[i]);\n      }\n\n      // Remove the directory from the index, unless it's the root.\n      if (path !== '/') {\n        delete this._index[path];\n      }\n    }\n    return inode;\n  }\n\n  /**\n   * Retrieves the directory listing of the given path.\n   * @return [String[]] An array of files in the given path, or 'null' if it does\n   *   not exist.\n   */\n  public ls(path: string): string[] {\n    var item = this._index[path];\n    if (item === undefined) {\n      return null;\n    }\n    return item.getListing();\n  }\n\n  /**\n   * Returns the inode of the given item.\n   * @param [String] path\n   * @return [BrowserFS.FileInode | BrowserFS.DirInode | null] Returns null if\n   *   the item does not exist.\n   */\n  public getInode(path: string): Inode {\n    var splitPath = this._split_path(path);\n    var dirpath = splitPath[0];\n    var itemname = splitPath[1];\n    // Retrieve from its parent directory.\n    var parent = this._index[dirpath];\n    if (parent === undefined) {\n      return null;\n    }\n    // Root case\n    if (dirpath === path) {\n      return parent;\n    }\n    return parent.getItem(itemname);\n  }\n\n  /**\n   * Static method for constructing indices from a JSON listing.\n   * @param [Object] listing Directory listing generated by tools/XHRIndexer.coffee\n   * @return [BrowserFS.FileIndex] A new FileIndex object.\n   */\n  public static fromListing<T>(listing): FileIndex<T> {\n    var idx = new FileIndex<T>();\n    // Add a root DirNode.\n    var rootInode = new DirInode<T>();\n    idx._index['/'] = rootInode;\n    var queue = [['', listing, rootInode]];\n    while (queue.length > 0) {\n      var inode;\n      var next = queue.pop();\n      var pwd = next[0];\n      var tree = next[1];\n      var parent = next[2];\n      for (var node in tree) {\n        var children = tree[node];\n        var name = \"\" + pwd + \"/\" + node;\n        if (children != null) {\n          idx._index[name] = inode = new DirInode<T>();\n          queue.push([name, children, inode]);\n        } else {\n          // This inode doesn't have correct size information, noted with -1.\n          inode = new FileInode<Stats>(new Stats(FileType.FILE, -1, 0x16D));\n        }\n        if (parent != null) {\n          parent._ls[node] = inode;\n        }\n      }\n    }\n    return idx;\n  }\n}\n\n/**\n * Generic interface for file/directory inodes.\n * Note that Stats objects are what we use for file inodes.\n */\nexport interface Inode {\n  // Is this an inode for a file?\n  isFile(): boolean;\n  // Is this an inode for a directory?\n  isDir(): boolean;\n}\n\n/**\n * Inode for a file. Stores an arbitrary (filesystem-specific) data payload.\n */\nexport class FileInode<T> implements Inode {\n  constructor(private data: T) { }\n  public isFile(): boolean { return true; }\n  public isDir(): boolean { return false; }\n  public getData(): T { return this.data; }\n  public setData(data: T): void { this.data = data; }\n}\n\n/**\n * Inode for a directory. Currently only contains the directory listing.\n */\nexport class DirInode<T> implements Inode {\n  private _ls: {[path: string]: Inode} = {};\n  /**\n   * Constructs an inode for a directory.\n   */\n  constructor(private data: T = null) {}\n  public isFile(): boolean {\n    return false;\n  }\n  public isDir(): boolean {\n    return true;\n  }\n  public getData(): T { return this.data; }\n\n  /**\n   * Return a Stats object for this inode.\n   * @todo Should probably remove this at some point. This isn't the\n   *       responsibility of the FileIndex.\n   * @return [BrowserFS.node.fs.Stats]\n   */\n  public getStats(): Stats {\n    return new Stats(FileType.DIRECTORY, 4096, 0x16D);\n  }\n  /**\n   * Returns the directory listing for this directory. Paths in the directory are\n   * relative to the directory's path.\n   * @return [String[]] The directory listing for this directory.\n   */\n  public getListing(): string[] {\n    return Object.keys(this._ls);\n  }\n  /**\n   * Returns the inode for the indicated item, or null if it does not exist.\n   * @param [String] p Name of item in this directory.\n   * @return [BrowserFS.FileInode | BrowserFS.DirInode | null]\n   */\n  public getItem(p: string): Inode {\n    var _ref;\n    return (_ref = this._ls[p]) != null ? _ref : null;\n  }\n  /**\n   * Add the given item to the directory listing. Note that the given inode is\n   * not copied, and will be mutated by the DirInode if it is a DirInode.\n   * @param [String] p Item name to add to the directory listing.\n   * @param [BrowserFS.FileInode | BrowserFS.DirInode] inode The inode for the\n   *   item to add to the directory inode.\n   * @return [Boolean] True if it was added, false if it already existed.\n   */\n  public addItem(p: string, inode: Inode): boolean {\n    if (p in this._ls) {\n      return false;\n    }\n    this._ls[p] = inode;\n    return true;\n  }\n  /**\n   * Removes the given item from the directory listing.\n   * @param [String] p Name of item to remove from the directory listing.\n   * @return [BrowserFS.FileInode | BrowserFS.DirInode | null] Returns the item\n   *   removed, or null if the item did not exist.\n   */\n  public remItem(p: string): Inode {\n    var item = this._ls[p];\n    if (item === undefined) {\n      return null;\n    }\n    delete this._ls[p];\n    return item;\n  }\n}\n\nexport function isFileInode<T>(inode: Inode): inode is FileInode<T> {\n  return inode && inode.isFile();\n}\n\nexport function isDirInode<T>(inode: Inode): inode is DirInode<T> {\n  return inode && inode.isDir();\n}\n"]}