/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const normalize = require("./normalize");
const join = require("./join");
const MemoryFileSystemError = require("./MemoryFileSystemError");
const errors = require("errno");
const stream = require("readable-stream");
const ReadableStream = stream.Readable;
const WritableStream = stream.Writable;
function isDir(item) {
if(typeof item !== "object") return false;
return item[""] === true;
}
function isFile(item) {
if(typeof item !== "object") return false;
return !item[""];
}
function pathToArray(path) {
path = normalize(path);
const nix = /^\//.test(path);
if(!nix) {
if(!/^[A-Za-z]:/.test(path)) {
throw new MemoryFileSystemError(errors.code.EINVAL, path);
}
path = path.replace(/[\\\/]+/g, "\\"); // multi slashs
path = path.split(/[\\\/]/);
path[0] = path[0].toUpperCase();
} else {
path = path.replace(/\/+/g, "/"); // multi slashs
path = path.substr(1).split("/");
}
if(!path[path.length-1]) path.pop();
return path;
}
function trueFn() { return true; }
function falseFn() { return false; }
class MemoryFileSystem {
constructor(data) {
this.data = data || {};
this.join = join;
this.pathToArray = pathToArray;
this.normalize = normalize;
}
meta(_path) {
const path = pathToArray(_path);
let current = this.data;
let i = 0;
for(; i < path.length - 1; i++) {
if(!isDir(current[path[i]]))
return;
current = current[path[i]];
}
return current[path[i]];
}
existsSync(_path) {
return !!this.meta(_path);
}
statSync(_path) {
let current = this.meta(_path);
if(_path === "/" || isDir(current)) {
return {
isFile: falseFn,
isDirectory: trueFn,
isBlockDevice: falseFn,
isCharacterDevice: falseFn,
isSymbolicLink: falseFn,
isFIFO: falseFn,
isSocket: falseFn
};
} else if(isFile(current)) {
return {
isFile: trueFn,
isDirectory: falseFn,
isBlockDevice: falseFn,
isCharacterDevice: falseFn,
isSymbolicLink: falseFn,
isFIFO: falseFn,
isSocket: falseFn
};
} else {
throw new MemoryFileSystemError(errors.code.ENOENT, _path, "stat");
}
}
readFileSync(_path, optionsOrEncoding) {
const path = pathToArray(_path);
let current = this.data;
let i = 0
for(; i < path.length - 1; i++) {
if(!isDir(current[path[i]]))
throw new MemoryFileSystemError(errors.code.ENOENT, _path, "readFile");
current = current[path[i]];
}
if(!isFile(current[path[i]])) {
if(isDir(current[path[i]]))
throw new MemoryFileSystemError(errors.code.EISDIR, _path, "readFile");
else
throw new MemoryFileSystemError(errors.code.ENOENT, _path, "readFile");
}
current = current[path[i]];
const encoding = typeof optionsOrEncoding === "object" ? optionsOrEncoding.encoding : optionsOrEncoding;
return encoding ? current.toString(encoding) : current;
}
readdirSync(_path) {
if(_path === "/") return Object.keys(this.data).filter(Boolean);
const path = pathToArray(_path);
let current = this.data;
let i = 0;
for(; i < path.length - 1; i++) {
if(!isDir(current[path[i]]))
throw new MemoryFileSystemError(errors.code.ENOENT, _path, "readdir");
current = current[path[i]];
}
if(!isDir(current[path[i]])) {
if(isFile(current[path[i]]))
throw new MemoryFileSystemError(errors.code.ENOTDIR, _path, "readdir");
else
throw new MemoryFileSystemError(errors.code.ENOENT, _path, "readdir");
}
return Object.keys(current[path[i]]).filter(Boolean);
}
mkdirpSync(_path) {
const path = pathToArray(_path);
if(path.length === 0) return;
let current = this.data;
for(let i = 0; i < path.length; i++) {
if(isFile(current[path[i]]))
throw new MemoryFileSystemError(errors.code.ENOTDIR, _path, "mkdirp");
else if(!isDir(current[path[i]]))
current[path[i]] = {"":true};
current = current[path[i]];
}
return;
}
mkdirSync(_path) {
const path = pathToArray(_path);
if(path.length === 0) return;
let current = this.data;
let i = 0;
for(; i < path.length - 1; i++) {
if(!isDir(current[path[i]]))
throw new MemoryFileSystemError(errors.code.ENOENT, _path, "mkdir");
current = current[path[i]];
}
if(isDir(current[path[i]]))
throw new MemoryFileSystemError(errors.code.EEXIST, _path, "mkdir");
else if(isFile(current[path[i]]))
throw new MemoryFileSystemError(errors.code.ENOTDIR, _path, "mkdir");
current[path[i]] = {"":true};
return;
}
_remove(_path, name, testFn) {
const path = pathToArray(_path);
const operation = name === "File" ? "unlink" : "rmdir";
if(path.length === 0) {
throw new MemoryFileSystemError(errors.code.EPERM, _path, operation);
}
let current = this.data;
let i = 0;
for(; i < path.length - 1; i++) {
if(!isDir(current[path[i]]))
throw new MemoryFileSystemError(errors.code.ENOENT, _path, operation);
current = current[path[i]];
}
if(!testFn(current[path[i]]))
throw new MemoryFileSystemError(errors.code.ENOENT, _path, operation);
delete current[path[i]];
return;
}
rmdirSync(_path) {
return this._remove(_path, "Directory", isDir);
}
unlinkSync(_path) {
return this._remove(_path, "File", isFile);
}
readlinkSync(_path) {
throw new MemoryFileSystemError(errors.code.ENOSYS, _path, "readlink");
}
writeFileSync(_path, content, optionsOrEncoding) {
if(!content && !optionsOrEncoding) throw new Error("No content");
const path = pathToArray(_path);
if(path.length === 0) {
throw new MemoryFileSystemError(errors.code.EISDIR, _path, "writeFile");
}
let current = this.data;
let i = 0
for(; i < path.length - 1; i++) {
if(!isDir(current[path[i]]))
throw new MemoryFileSystemError(errors.code.ENOENT, _path, "writeFile");
current = current[path[i]];
}
if(isDir(current[path[i]]))
throw new MemoryFileSystemError(errors.code.EISDIR, _path, "writeFile");
const encoding = typeof optionsOrEncoding === "object" ? optionsOrEncoding.encoding : optionsOrEncoding;
current[path[i]] = optionsOrEncoding || typeof content === "string" ? new Buffer.from(content, encoding) : content;
return;
}
// stream methods
createReadStream(path, options) {
let stream = new ReadableStream();
let done = false;
let data;
try {
data = this.readFileSync(path);
} catch (e) {
stream._read = function() {
if (done) {
return;
}
done = true;
this.emit('error', e);
this.push(null);
};
return stream;
}
options = options || { };
options.start = options.start || 0;
options.end = options.end || data.length;
stream._read = function() {
if (done) {
return;
}
done = true;
this.push(data.slice(options.start, options.end));
this.push(null);
};
return stream;
}
createWriteStream(path) {
let stream = new WritableStream();
try {
// Zero the file and make sure it is writable
this.writeFileSync(path, new Buffer.alloc(0));
} catch(e) {
// This or setImmediate?
stream.once('prefinish', function() {
stream.emit('error', e);
});
return stream;
}
let bl = [ ], len = 0;
stream._write = (chunk, encoding, callback) => {
bl.push(chunk);
len += chunk.length;
this.writeFile(path, Buffer.concat(bl, len), callback);
}
return stream;
}
// async functions
exists(path, callback) {
return callback(this.existsSync(path));
}
writeFile(path, content, encoding, callback) {
if(!callback) {
callback = encoding;
encoding = undefined;
}
try {
this.writeFileSync(path, content, encoding);
} catch(e) {
return callback(e);
}
return callback();
}
}
// async functions
["stat", "readdir", "mkdirp", "rmdir", "unlink", "readlink"].forEach(function(fn) {
MemoryFileSystem.prototype[fn] = function(path, callback) {
let result;
try {
result = this[fn + "Sync"](path);
} catch(e) {
setImmediate(function() {
callback(e);
});
return;
}
setImmediate(function() {
callback(null, result);
});
};
});
["mkdir", "readFile"].forEach(function(fn) {
MemoryFileSystem.prototype[fn] = function(path, optArg, callback) {
if(!callback) {
callback = optArg;
optArg = undefined;
}
let result;
try {
result = this[fn + "Sync"](path, optArg);
} catch(e) {
setImmediate(function() {
callback(e);
});
return;
}
setImmediate(function() {
callback(null, result);
});
};
});
module.exports = MemoryFileSystem;
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