Revert 57635: Implement about:labs

chrome/browser/labs.cc

-// Copyright (c) 2010 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/labs.h"
-
-#include <algorithm>
-#include <iterator>
-#include <map>
-#include <set>
-
-#include "app/l10n_util.h"
-#include "base/command_line.h"
-#include "base/values.h"
-#include "chrome/browser/platform_util.h"
-#include "chrome/browser/prefs/pref_service.h"
-#include "chrome/browser/profile.h"
-#include "chrome/common/chrome_switches.h"
-#include "chrome/common/pref_names.h"
-#include "grit/generated_resources.h"
-
-namespace about_labs {
-
-enum { kOsMac = 1 << 0, kOsWin = 1 << 1, kOsLinux = 1 << 2 };
-
-struct Experiment {
-  // The internal name of the experiment. This is never shown to the user.
-  // It _is_ however stored in the prefs file, so you shouldn't change the
-  // name of existing labs.
-  const char* internal_name;
-
-  // String id of the message containing the experiment's name.
-  int visible_name_id;
-
-  // String id of the message containing the experiment's description.
-  int visible_description_id;
-
-  // The platforms the experiment is available on
-  // Needs to be more than a compile-time #ifdef because of profile sync.
-  unsigned supported_platforms;  // bitmask
-
-  // The commandline parameter that's added when this lab is active. This is
-  // different from |internal_name| so that the commandline flag can be
-  // renamed without breaking the prefs file.
-  const char* command_line;
-};
-
-const Experiment kExperiments[] = {
-  {
-    "expose-for-tabs",
-    IDS_LABS_TABPOSE_NAME,
-    IDS_LABS_TABPOSE_DESCRIPTION,
-    kOsMac,
-#if defined(OS_MACOSX)
-    // The switch exists only on OS X.
-    switches::kEnableExposeForTabs
-#else
-    ""
-#endif
-  },
-  {
-    "vertical-tabs",
-    IDS_LABS_LEFTTABS_NAME,
-    IDS_LABS_LEFTTABS_DESCRIPTION,
-    kOsWin,
-    switches::kEnableVerticalTabs
-  }
-};
-
-// Extracts the list of enabled lab experiments from a profile and stores them
-// in a set.
-void GetEnabledLabs(const PrefService* prefs, std::set<std::string>* result) {
-  const ListValue* enabled_experiments = prefs->GetList(
-      prefs::kEnabledLabsExperiments);
-  if (!enabled_experiments)
-    return;
-
-  for (ListValue::const_iterator it = enabled_experiments->begin();
-       it != enabled_experiments->end();
-       ++it) {
-    std::string experiment_name;
-    if (!(*it)->GetAsString(&experiment_name)) {
-      LOG(WARNING) << "Invalid entry in " << prefs::kEnabledLabsExperiments;
-      continue;
-    }
-    result->insert(experiment_name);
-  }
-}
-
-// Takes a set of enabled lab experiments
-void SetEnabledLabs(
-    PrefService* prefs, const std::set<std::string>& enabled_experiments) {
-  ListValue* experiments_list = prefs->GetMutableList(
-      prefs::kEnabledLabsExperiments);
-  if (!experiments_list)
-    return;
-
-  experiments_list->Clear();
-  for (std::set<std::string>::const_iterator it = enabled_experiments.begin();
-       it != enabled_experiments.end();
-       ++it) {
-    experiments_list->Append(new StringValue(*it));
-  }
-}
-
-// Removes all experiments from prefs::kEnabledLabsExperiments that are
-// unknown, to prevent this list to become very long as experiments are added
-// and removed.
-void SanitizeList(PrefService* prefs) {
-  std::set<std::string> known_experiments;
-  for (size_t i = 0; i < arraysize(kExperiments); ++i)
-    known_experiments.insert(kExperiments[i].internal_name);
-
-  std::set<std::string> enabled_experiments;
-  GetEnabledLabs(prefs, &enabled_experiments);
-
-  std::set<std::string> new_enabled_experiments;
-  std::set_intersection(
-      known_experiments.begin(), known_experiments.end(),
-      enabled_experiments.begin(), enabled_experiments.end(),
-      std::inserter(new_enabled_experiments, new_enabled_experiments.begin()));
-
-  SetEnabledLabs(prefs, new_enabled_experiments);
-}
-
-void GetSanitizedEnabledLabs(
-    PrefService* prefs, std::set<std::string>* result) {
-  SanitizeList(prefs);
-  GetEnabledLabs(prefs, result);
-}
-
-int GetCurrentPlatform() {
-#if defined(OS_MACOSX)
-  return kOsMac;
-#elif defined(OS_WIN)
-  return kOsWin;
-#elif defined(OS_LINUX)
-  return kOsLinux;
-#else
-#error Unknown platform
-#endif
-}
-
-bool IsEnabled() {
-#if defined(OS_CHROMEOS)
-  // ChromeOS uses a different mechanism for about:labs; integrated with their
-  // dom ui options.
-  return false;
-#elif defined(GOOGLE_CHROME_BUILD)
-  // Don't enable this on the stable channel.
-  return platform_util::GetVersionStringModifier() != string16();
-#else
-  return true;
-#endif
-}
-
-void ConvertLabsToSwitches(Profile* profile, CommandLine* command_line) {
-  // Do not activate labs features on the stable channel.
-  if (!IsEnabled())
-    return;
-
-  std::set<std::string> enabled_experiments;
-  GetSanitizedEnabledLabs(profile->GetPrefs(), &enabled_experiments);
-
-  std::map<std::string, const Experiment*> experiments;
-  for (size_t i = 0; i < arraysize(kExperiments); ++i)
-    experiments[kExperiments[i].internal_name] = &kExperiments[i];
-
-  for (std::set<std::string>::iterator it = enabled_experiments.begin();
-       it != enabled_experiments.end();
-       ++it) {
-    const std::string& experiment_name = *it;
-    std::map<std::string, const Experiment*>::iterator experiment =
-        experiments.find(experiment_name);
-    DCHECK(experiment != experiments.end());
-    if (experiment == experiments.end())
-      continue;
-
-    command_line->AppendSwitch(experiment->second->command_line);
-  }
-}
-
-ListValue* GetLabsExperimentsData(Profile* profile) {
-  std::set<std::string> enabled_experiments;
-  GetSanitizedEnabledLabs(profile->GetPrefs(), &enabled_experiments);
-
-  int current_platform = GetCurrentPlatform();
-
-  ListValue* experiments_data = new ListValue();
-  for (size_t i = 0; i < arraysize(kExperiments); ++i) {
-    const Experiment& experiment = kExperiments[i];
-    if (!(experiment.supported_platforms & current_platform))
-      continue;
-
-    DictionaryValue* data = new DictionaryValue();
-    data->SetString("internal_name", experiment.internal_name);
-    data->SetString("name",
-                    l10n_util::GetStringUTF16(experiment.visible_name_id));
-    data->SetString("description",
-                    l10n_util::GetStringUTF16(
-                        experiment.visible_description_id));
-    data->SetBoolean("enabled",
-                      enabled_experiments.count(experiment.internal_name) > 0);
-
-    experiments_data->Append(data);
-  }
-  return experiments_data;
-}
-
-static bool needs_restart_ = false;
-
-bool IsRestartNeededToCommitChanges() {
-  return needs_restart_;
-}
-
-void SetExperimentEnabled(
-    Profile* profile, const std::string& internal_name, bool enable) {
-  needs_restart_ = true;
-
-  std::set<std::string> enabled_experiments;
-  GetSanitizedEnabledLabs(profile->GetPrefs(), &enabled_experiments);
-
-  if (enable)
-    enabled_experiments.insert(internal_name);
-  else
-    enabled_experiments.erase(internal_name);
-
-  SetEnabledLabs(profile->GetPrefs(), enabled_experiments);
-}
-
-}  // namespace Labs