Implemented the rest of loading/parsing logic for extension i18n:...

chrome/browser/extensions/extension_l10n_util.cc

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/extensions/extension_l10n_util.h"
 
 #include <set>
 #include <string>
 #include <vector>
 
 #include "app/l10n_util.h"
 #include "base/file_util.h"
 #include "base/string_util.h"
 #include "base/values.h"
+#include "chrome/browser/extensions/extension_message_handler.h"
 #include "chrome/common/extensions/extension.h"
 #include "chrome/common/extensions/extension_constants.h"
+#include "chrome/common/json_value_serializer.h"
 
 namespace keys = extension_manifest_keys;
 
 namespace extension_l10n_util {
 
 bool ValidateDefaultLocale(const Extension* extension) {
   std::string default_locale = extension->default_locale();
 
   if (extension->supported_locales().find(default_locale) !=
         extension->supported_locales().end()) {
@@ skipping 53 matching lines @@
   }
 
   if (extension->supported_locales().empty()) {
     *error = extension_manifest_errors::kLocalesNoValidLocaleNamesListed;
     return false;
   }
 
   return true;
 }
 
+// Loads contents of the messages file for given locale. If file is not found,
+// or there was parsing error we return NULL and set |error|.
+// Caller owns the returned object.
+static DictionaryValue* LoadMessageFile(const FilePath& locale_path,
+                                        const std::string& locale,
+                                        std::string* error) {
+  std::string extension_locale = locale;
+  // Normalize hyphens to underscores because that's what our locale files use.
+  std::replace(extension_locale.begin(), extension_locale.end(), '-', '_');
+  FilePath file = locale_path.AppendASCII(extension_locale)
+      .AppendASCII(Extension::kMessagesFilename);

[Aaron Boodman, 2009/08/31 21:42:55]

BTW: The message filenames should have the ".json" extension, so that they can
be associated with editors and so forth.

+  JSONFileValueSerializer messages_serializer(file);
+  Value *dictionary = messages_serializer.Deserialize(error);
+  if (!dictionary && error->empty()) {
+    // JSONFileValueSerializer just returns NULL if file cannot be found. It
+    // doesn't set the error, so we have to do it.
+    *error = StringPrintf("Catalog file is missing for locale %s.",
+                          extension_locale.c_str());
+  }
+
+  return static_cast<DictionaryValue*>(dictionary);
+}
+
+bool LoadMessageCatalogs(const FilePath& locale_path,
+                         Extension* extension,
+                         std::string* error) {
+  scoped_ptr<DictionaryValue> default_catalog(
+      LoadMessageFile(locale_path, extension->default_locale(), error));
+  if (!default_catalog.get()) {
+    return false;
+  }
+
+  scoped_ptr<DictionaryValue> app_catalog(
+      LoadMessageFile(locale_path, extension->application_locale(), error));
+  if (!app_catalog.get()) {
+    // Only default catalog has to be present. This is not an error.
+    app_catalog.reset(new DictionaryValue);
+    error->clear();
+  }
+
+  ExtensionMessageHandler* message_handler = new ExtensionMessageHandler;
+  if (!message_handler->Init(default_catalog.get(), app_catalog.get(), error)) {
+    return false;
+  }
+  extension->set_message_handler(message_handler);
+
+  return true;
+}
+
 }  // namespace extension_l10n_util