1 files changed, 146 insertions, 0 deletions
diff --git a/components/search/search.cc b/components/search/search.cc
new file mode 100644
index 0000000..8689e51
--- /dev/null
+++ b/components/search/search.cc
@@ -0,0 +1,146 @@
+// Copyright 2014 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 "components/search/search.h"
+
+#include "base/command_line.h"
+#include "base/metrics/field_trial.h"
+#include "base/strings/string_number_conversions.h"
+#include "base/strings/string_split.h"
+#include "base/strings/string_util.h"
+#include "base/strings/utf_string_conversions.h"
+#include "components/search/search_switches.h"
+
+namespace chrome {
+
+namespace {
+
+// Configuration options for Embedded Search.
+// EmbeddedSearch field trials are named in such a way that we can parse out
+// the experiment configuration from the trial's group name in order to give
+// us maximum flexability in running experiments.
+// Field trial groups should be named things like "Group7 espv:2 instant:1".
+// The first token is always GroupN for some integer N, followed by a
+// space-delimited list of key:value pairs which correspond to these flags:
+const char kEmbeddedPageVersionFlagName[] = "espv";
+
+#if defined(OS_IOS)
+const uint64 kEmbeddedPageVersionDefault = 1;
+#elif defined(OS_ANDROID)
+const uint64 kEmbeddedPageVersionDefault = 1;
+// Use this variant to enable EmbeddedSearch SearchBox API in the results page.
+const uint64 kEmbeddedSearchEnabledVersion = 2;
+#else
+const uint64 kEmbeddedPageVersionDefault = 2;
+#endif
+
+// Constants for the field trial name and group prefix.
+// Note in M30 and below this field trial was named "InstantExtended" and in
+// M31 was renamed to EmbeddedSearch for clarity and cleanliness.  Since we
+// can't easilly sync up Finch configs with the pushing of this change to
+// Dev & Canary, for now the code accepts both names.
+// TODO(dcblack): Remove the InstantExtended name once M31 hits the Beta
+// channel.
+const char kInstantExtendedFieldTrialName[] = "InstantExtended";
+const char kEmbeddedSearchFieldTrialName[] = "EmbeddedSearch";
+
+// If the field trial's group name ends with this string its configuration will
+// be ignored and Instant Extended will not be enabled by default.
+const char kDisablingSuffix[] = "DISABLED";
+
+}  // namespace
+
+bool IsInstantExtendedAPIEnabled() {
+#if defined(OS_IOS)
+  return false;
+#elif defined(OS_ANDROID)
+  return EmbeddedSearchPageVersion() == kEmbeddedSearchEnabledVersion;
+#else
+  return true;
+#endif  // defined(OS_IOS)
+}
+
+// Determine what embedded search page version to request from the user's
+// default search provider. If 0, the embedded search UI should not be enabled.
+uint64 EmbeddedSearchPageVersion() {
+#if defined(OS_ANDROID)
+  if (CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kEnableEmbeddedSearchAPI)) {
+    return kEmbeddedSearchEnabledVersion;
+  }
+#endif
+
+  FieldTrialFlags flags;
+  if (GetFieldTrialInfo(&flags)) {
+    return GetUInt64ValueForFlagWithDefault(kEmbeddedPageVersionFlagName,
+                                            kEmbeddedPageVersionDefault,
+                                            flags);
+  }
+  return kEmbeddedPageVersionDefault;
+}
+
+bool GetFieldTrialInfo(FieldTrialFlags* flags) {
+  // Get the group name.  If the EmbeddedSearch trial doesn't exist, look for
+  // the older InstantExtended name.
+  std::string group_name = base::FieldTrialList::FindFullName(
+      kEmbeddedSearchFieldTrialName);
+  if (group_name.empty()) {
+    group_name = base::FieldTrialList::FindFullName(
+        kInstantExtendedFieldTrialName);
+  }
+
+  if (EndsWith(group_name, kDisablingSuffix, true))
+    return false;
+
+  // We have a valid trial that isn't disabled. Extract the flags.
+  std::string group_prefix(group_name);
+  size_t first_space = group_name.find(" ");
+  if (first_space != std::string::npos) {
+    // There is a flags section of the group name. Split that out and parse it.
+    group_prefix = group_name.substr(0, first_space);
+    if (!base::SplitStringIntoKeyValuePairs(group_name.substr(first_space),
+                                            ':', ' ', flags)) {
+      // Failed to parse the flags section. Assume the whole group name is
+      // invalid.
+      return false;
+    }
+  }
+  return true;
+}
+
+// Given a FieldTrialFlags object, returns the string value of the provided
+// flag.
+std::string GetStringValueForFlagWithDefault(const std::string& flag,
+                                             const std::string& default_value,
+                                             const FieldTrialFlags& flags) {
+  FieldTrialFlags::const_iterator i;
+  for (i = flags.begin(); i != flags.end(); i++) {
+    if (i->first == flag)
+      return i->second;
+  }
+  return default_value;
+}
+
+// Given a FieldTrialFlags object, returns the uint64 value of the provided
+// flag.
+uint64 GetUInt64ValueForFlagWithDefault(const std::string& flag,
+                                        uint64 default_value,
+                                        const FieldTrialFlags& flags) {
+  uint64 value;
+  std::string str_value =
+      GetStringValueForFlagWithDefault(flag, std::string(), flags);
+  if (base::StringToUint64(str_value, &value))
+    return value;
+  return default_value;
+}
+
+// Given a FieldTrialFlags object, returns the boolean value of the provided
+// flag.
+bool GetBoolValueForFlagWithDefault(const std::string& flag,
+                                    bool default_value,
+                                    const FieldTrialFlags& flags) {
+  return !!GetUInt64ValueForFlagWithDefault(flag, default_value ? 1 : 0, flags);
+}
+
+}  // namespace chrome