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authorMatt A. Tobin <email@mattatobin.com>2018-02-10 02:51:36 -0500
committerMatt A. Tobin <email@mattatobin.com>2018-02-10 02:51:36 -0500
commit37d5300335d81cecbecc99812747a657588c63eb (patch)
tree765efa3b6a56bb715d9813a8697473e120436278 /toolkit/jetpack/sdk/io/file.js
parentb2bdac20c02b12f2057b9ef70b0a946113a00e00 (diff)
parent4fb11cd5966461bccc3ed1599b808237be6b0de9 (diff)
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Merge branch 'ext-work'
Diffstat (limited to 'toolkit/jetpack/sdk/io/file.js')
-rw-r--r--toolkit/jetpack/sdk/io/file.js196
1 files changed, 196 insertions, 0 deletions
diff --git a/toolkit/jetpack/sdk/io/file.js b/toolkit/jetpack/sdk/io/file.js
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+++ b/toolkit/jetpack/sdk/io/file.js
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+module.metadata = {
+ "stability": "deprecated"
+};
+
+const {Cc,Ci,Cr} = require("chrome");
+const byteStreams = require("./byte-streams");
+const textStreams = require("./text-streams");
+
+// Flags passed when opening a file. See nsprpub/pr/include/prio.h.
+const OPEN_FLAGS = {
+ RDONLY: parseInt("0x01"),
+ WRONLY: parseInt("0x02"),
+ CREATE_FILE: parseInt("0x08"),
+ APPEND: parseInt("0x10"),
+ TRUNCATE: parseInt("0x20"),
+ EXCL: parseInt("0x80")
+};
+
+var dirsvc = Cc["@mozilla.org/file/directory_service;1"]
+ .getService(Ci.nsIProperties);
+
+function MozFile(path) {
+ var file = Cc['@mozilla.org/file/local;1']
+ .createInstance(Ci.nsILocalFile);
+ file.initWithPath(path);
+ return file;
+}
+
+function ensureReadable(file) {
+ if (!file.isReadable())
+ throw new Error("path is not readable: " + file.path);
+}
+
+function ensureDir(file) {
+ ensureExists(file);
+ if (!file.isDirectory())
+ throw new Error("path is not a directory: " + file.path);
+}
+
+function ensureFile(file) {
+ ensureExists(file);
+ if (!file.isFile())
+ throw new Error("path is not a file: " + file.path);
+}
+
+function ensureExists(file) {
+ if (!file.exists())
+ throw friendlyError(Cr.NS_ERROR_FILE_NOT_FOUND, file.path);
+}
+
+function friendlyError(errOrResult, filename) {
+ var isResult = typeof(errOrResult) === "number";
+ var result = isResult ? errOrResult : errOrResult.result;
+ switch (result) {
+ case Cr.NS_ERROR_FILE_NOT_FOUND:
+ return new Error("path does not exist: " + filename);
+ }
+ return isResult ? new Error("XPCOM error code: " + errOrResult) : errOrResult;
+}
+
+exports.exists = function exists(filename) {
+ return MozFile(filename).exists();
+};
+
+exports.isFile = function isFile(filename) {
+ return MozFile(filename).isFile();
+};
+
+exports.read = function read(filename, mode) {
+ if (typeof(mode) !== "string")
+ mode = "";
+
+ // Ensure mode is read-only.
+ mode = /b/.test(mode) ? "b" : "";
+
+ var stream = exports.open(filename, mode);
+ try {
+ var str = stream.read();
+ }
+ finally {
+ stream.close();
+ }
+
+ return str;
+};
+
+exports.join = function join(base) {
+ if (arguments.length < 2)
+ throw new Error("need at least 2 args");
+ base = MozFile(base);
+ for (var i = 1; i < arguments.length; i++)
+ base.append(arguments[i]);
+ return base.path;
+};
+
+exports.dirname = function dirname(path) {
+ var parent = MozFile(path).parent;
+ return parent ? parent.path : "";
+};
+
+exports.basename = function basename(path) {
+ var leafName = MozFile(path).leafName;
+
+ // On Windows, leafName when the path is a volume letter and colon ("c:") is
+ // the path itself. But such a path has no basename, so we want the empty
+ // string.
+ return leafName == path ? "" : leafName;
+};
+
+exports.list = function list(path) {
+ var file = MozFile(path);
+ ensureDir(file);
+ ensureReadable(file);
+
+ var entries = file.directoryEntries;
+ var entryNames = [];
+ while(entries.hasMoreElements()) {
+ var entry = entries.getNext();
+ entry.QueryInterface(Ci.nsIFile);
+ entryNames.push(entry.leafName);
+ }
+ return entryNames;
+};
+
+exports.open = function open(filename, mode) {
+ var file = MozFile(filename);
+ if (typeof(mode) !== "string")
+ mode = "";
+
+ // File opened for write only.
+ if (/w/.test(mode)) {
+ if (file.exists())
+ ensureFile(file);
+ var stream = Cc['@mozilla.org/network/file-output-stream;1'].
+ createInstance(Ci.nsIFileOutputStream);
+ var openFlags = OPEN_FLAGS.WRONLY |
+ OPEN_FLAGS.CREATE_FILE |
+ OPEN_FLAGS.TRUNCATE;
+ var permFlags = 0o644; // u+rw go+r
+ try {
+ stream.init(file, openFlags, permFlags, 0);
+ }
+ catch (err) {
+ throw friendlyError(err, filename);
+ }
+ return /b/.test(mode) ?
+ new byteStreams.ByteWriter(stream) :
+ new textStreams.TextWriter(stream);
+ }
+
+ // File opened for read only, the default.
+ ensureFile(file);
+ stream = Cc['@mozilla.org/network/file-input-stream;1'].
+ createInstance(Ci.nsIFileInputStream);
+ try {
+ stream.init(file, OPEN_FLAGS.RDONLY, 0, 0);
+ }
+ catch (err) {
+ throw friendlyError(err, filename);
+ }
+ return /b/.test(mode) ?
+ new byteStreams.ByteReader(stream) :
+ new textStreams.TextReader(stream);
+};
+
+exports.remove = function remove(path) {
+ var file = MozFile(path);
+ ensureFile(file);
+ file.remove(false);
+};
+
+exports.mkpath = function mkpath(path) {
+ var file = MozFile(path);
+ if (!file.exists())
+ file.create(Ci.nsIFile.DIRECTORY_TYPE, 0o755); // u+rwx go+rx
+ else if (!file.isDirectory())
+ throw new Error("The path already exists and is not a directory: " + path);
+};
+
+exports.rmdir = function rmdir(path) {
+ var file = MozFile(path);
+ ensureDir(file);
+ try {
+ file.remove(false);
+ }
+ catch (err) {
+ // Bug 566950 explains why we're not catching a specific exception here.
+ throw new Error("The directory is not empty: " + path);
+ }
+};