gin/modules/file_module_provider.cc

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "gin/modules/file_module_provider.h"
   6
   7 #include "base/bind.h"
   8 #include "base/files/file_util.h"
   9 #include "base/message_loop/message_loop.h"
  10 #include "base/strings/string_split.h"
  11 #include "gin/converter.h"
  12
  13 namespace gin {
  14
  15 namespace {
  16
  17 void AttempToLoadModule(const base::WeakPtr<Runner>& runner,
  18                         const std::vector<base::FilePath>& search_paths,
  19                         const std::string& id) {
  20   if (!runner)
  21     return;
  22
  23   std::vector<std::string> components;
  24   base::SplitString(id, '/', &components);
  25
  26   base::FilePath path;
  27   for (size_t i = 0; i < components.size(); ++i) {
  28     // TODO(abarth): Technically the path components can be UTF-8. We don't
  29     // handle that case correctly yet.
  30     path = path.AppendASCII(components[i]);
  31   }
  32   path = path.AddExtension(FILE_PATH_LITERAL("js"));
  33
  34   for (size_t i = 0; i < search_paths.size(); ++i) {
  35     std::string source;
  36     if (!ReadFileToString(search_paths[i].Append(path), &source))
  37       continue;
  38
  39     Runner::Scope scope(runner.get());
  40     runner->Run(source, id);
  41     return;
  42   }
  43   LOG(ERROR) << "Failed to load module from disk: " << id;
  44 }
  45
  46 }  // namespace
  47
  48 FileModuleProvider::FileModuleProvider(
  49     const std::vector<base::FilePath>& search_paths)
  50     : search_paths_(search_paths) {
  51 }
  52
  53 FileModuleProvider::~FileModuleProvider() {
  54 }
  55
  56 void FileModuleProvider::AttempToLoadModules(
  57     Runner* runner, const std::set<std::string>& ids) {
  58   std::set<std::string> modules = ids;
  59   for (std::set<std::string>::const_iterator it = modules.begin();
  60        it != modules.end(); ++it) {
  61     const std::string& id = *it;
  62     if (attempted_ids_.count(id))
  63       continue;
  64     attempted_ids_.insert(id);
  65     base::MessageLoop::current()->PostTask(FROM_HERE, base::Bind(
  66         AttempToLoadModule, runner->GetWeakPtr(), search_paths_, id));
  67   }
  68 }
  69
  70 }  // namespace gin