1 files changed, 87 insertions, 0 deletions
diff --git a/toolkit/mozapps/installer/precompile_cache.js b/toolkit/mozapps/installer/precompile_cache.js
new file mode 100644
index 000000000..3eac93b65
--- /dev/null
+++ b/toolkit/mozapps/installer/precompile_cache.js
@@ -0,0 +1,87 @@
+/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et: */
+/* 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/. */
+
+// see http://mxr.mozilla.org/mozilla-central/source/services/sync/Weave.js#76
+
+var Cc = Components.classes;
+var Ci = Components.interfaces;
+var Cu = Components.utils;
+
+Cu.import("resource://gre/modules/Services.jsm");
+
+const rph = Services.io.getProtocolHandler("resource").QueryInterface(Ci.nsIResProtocolHandler);
+
+function endsWith(str, end) {
+  return str.slice(-end.length) == end;
+}
+
+function jar_entries(jarReader, pattern) {
+  var entries = [];
+  var enumerator = jarReader.findEntries(pattern);
+  while (enumerator.hasMore()) {
+    entries.push(enumerator.getNext());
+  }
+  return entries;
+}
+
+function dir_entries(baseDir, subpath, ext) {
+  try {
+    var dir = baseDir.clone();
+    dir.append(subpath);
+    var enumerator = dir.directoryEntries;
+  } catch (e) {
+    return [];
+  }
+  var entries = [];
+  while (enumerator.hasMoreElements()) {
+    var file = enumerator.getNext().QueryInterface(Ci.nsIFile);
+    if (file.isDirectory()) {
+      entries = entries.concat(dir_entries(dir, file.leafName, ext).map(p => subpath + "/" + p));
+    } else if (endsWith(file.leafName, ext)) {
+      entries.push(subpath + "/" + file.leafName);
+    }
+  }
+  return entries;
+}
+
+function get_modules_under(uri) {
+  if (uri instanceof Ci.nsIJARURI) {
+    let jar = uri.QueryInterface(Ci.nsIJARURI);
+    let jarReader = Cc["@mozilla.org/libjar/zip-reader;1"].createInstance(Ci.nsIZipReader);
+    let file = jar.JARFile.QueryInterface(Ci.nsIFileURL);
+    jarReader.open(file.file);
+    let entries = jar_entries(jarReader, "components/*.js")
+                  .concat(jar_entries(jarReader, "modules/*.js"))
+                  .concat(jar_entries(jarReader, "modules/*.jsm"));
+    jarReader.close();
+    return entries;
+  } else if (uri instanceof Ci.nsIFileURL) {
+    let file = uri.QueryInterface(Ci.nsIFileURL);
+    return dir_entries(file.file, "components", ".js")
+           .concat(dir_entries(file.file, "modules", ".js"))
+           .concat(dir_entries(file.file, "modules", ".jsm"));
+  }
+  throw new Error("Expected a nsIJARURI or nsIFileURL");
+}
+
+function load_modules_under(spec, uri) {
+  var entries = get_modules_under(uri).sort();
+  for (let entry of entries) {
+    try {
+      dump(spec + entry + "\n");
+      Cu.import(spec + entry, null);
+    } catch (e) {}
+  }
+}
+
+function resolveResource(spec) {
+  var uri = Services.io.newURI(spec, null, null);
+  return Services.io.newURI(rph.resolveURI(uri), null, null);
+}
+
+function precompile_startupcache(uri) {
+  load_modules_under(uri, resolveResource(uri));
+}