mirror of
https://github.com/classilla/tenfourfox.git
synced 2024-06-27 17:29:33 +00:00
90 lines
3.9 KiB
JavaScript
90 lines
3.9 KiB
JavaScript
/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
|
|
/* vim: set ts=2 et sw=2 tw=80 filetype=javascript: */
|
|
/* 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/. */
|
|
|
|
this.EXPORTED_SYMBOLS = [
|
|
"DownloadPaths",
|
|
];
|
|
|
|
/**
|
|
* This module provides the DownloadPaths object which contains methods for
|
|
* giving names and paths to files being downloaded.
|
|
*
|
|
* List of methods:
|
|
*
|
|
* nsILocalFile
|
|
* createNiceUniqueFile(nsILocalFile aLocalFile)
|
|
*
|
|
* [string base, string ext]
|
|
* splitBaseNameAndExtension(string aLeafName)
|
|
*/
|
|
|
|
const Cc = Components.classes;
|
|
const Ci = Components.interfaces;
|
|
const Cu = Components.utils;
|
|
const Cr = Components.results;
|
|
|
|
this.DownloadPaths = {
|
|
/**
|
|
* Creates a uniquely-named file starting from the name of the provided file.
|
|
* If a file with the provided name already exists, the function attempts to
|
|
* create nice alternatives, like "base(1).ext" (instead of "base-1.ext").
|
|
*
|
|
* If a unique name cannot be found, the function throws the XPCOM exception
|
|
* NS_ERROR_FILE_TOO_BIG. Other exceptions, like NS_ERROR_FILE_ACCESS_DENIED,
|
|
* can also be expected.
|
|
*
|
|
* @param aTemplateFile
|
|
* nsILocalFile whose leaf name is going to be used as a template. The
|
|
* provided object is not modified.
|
|
* @returns A new instance of an nsILocalFile object pointing to the newly
|
|
* created empty file. On platforms that support permission bits, the
|
|
* file is created with permissions 644.
|
|
*/
|
|
createNiceUniqueFile: function DP_createNiceUniqueFile(aTemplateFile) {
|
|
// Work on a clone of the provided template file object.
|
|
var curFile = aTemplateFile.clone().QueryInterface(Ci.nsILocalFile);
|
|
var [base, ext] = DownloadPaths.splitBaseNameAndExtension(curFile.leafName);
|
|
// Try other file names, for example "base(1).txt" or "base(1).tar.gz",
|
|
// only if the file name initially set already exists.
|
|
for (let i = 1; i < 10000 && curFile.exists(); i++) {
|
|
curFile.leafName = base + "(" + i + ")" + ext;
|
|
}
|
|
// At this point we hand off control to createUnique, which will create the
|
|
// file with the name we chose, if it is valid. If not, createUnique will
|
|
// attempt to modify it again, for example it will shorten very long names
|
|
// that can't be created on some platforms, and for which a normal call to
|
|
// nsIFile.create would result in NS_ERROR_FILE_NOT_FOUND. This can result
|
|
// very rarely in strange names like "base(9999).tar-1.gz" or "ba-1.gz".
|
|
curFile.createUnique(Ci.nsIFile.NORMAL_FILE_TYPE, 0o644);
|
|
return curFile;
|
|
},
|
|
|
|
/**
|
|
* Separates the base name from the extension in a file name, recognizing some
|
|
* double extensions like ".tar.gz".
|
|
*
|
|
* @param aLeafName
|
|
* The full leaf name to be parsed. Be careful when processing names
|
|
* containing leading or trailing dots or spaces.
|
|
* @returns [base, ext]
|
|
* The base name of the file, which can be empty, and its extension,
|
|
* which always includes the leading dot unless it's an empty string.
|
|
* Concatenating the two items always results in the original name.
|
|
*/
|
|
splitBaseNameAndExtension: function DP_splitBaseNameAndExtension(aLeafName) {
|
|
// The following regular expression is built from these key parts:
|
|
// .*? Matches the base name non-greedily.
|
|
// \.[A-Z0-9]{1,3} Up to three letters or numbers preceding a
|
|
// double extension.
|
|
// \.(?:gz|bz2|Z) The second part of common double extensions.
|
|
// \.[^.]* Matches any extension or a single trailing dot.
|
|
var [, base, ext] = /(.*?)(\.[A-Z0-9]{1,3}\.(?:gz|bz2|Z)|\.[^.]*)?$/i
|
|
.exec(aLeafName);
|
|
// Return an empty string instead of undefined if no extension is found.
|
|
return [base, ext || ""];
|
|
}
|
|
};
|