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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/scoped_add_feature_flags.h"
#include <string_view>
#include "base/base_switches.h"
#include "base/command_line.h"
#include "base/containers/contains.h"
#include "base/strings/strcat.h"
#include "base/strings/string_util.h"
namespace base {
ScopedAddFeatureFlags::ScopedAddFeatureFlags(CommandLine* command_line)
: command_line_(command_line) {
std::string enabled_features =
command_line->GetSwitchValueASCII(switches::kEnableFeatures);
std::string disabled_features =
command_line->GetSwitchValueASCII(switches::kDisableFeatures);
for (std::string_view feature :
FeatureList::SplitFeatureListString(enabled_features)) {
enabled_features_.emplace_back(feature);
}
for (std::string_view feature :
FeatureList::SplitFeatureListString(disabled_features)) {
disabled_features_.emplace_back(feature);
}
}
ScopedAddFeatureFlags::~ScopedAddFeatureFlags() {
command_line_->RemoveSwitch(switches::kEnableFeatures);
command_line_->AppendSwitchASCII(switches::kEnableFeatures,
JoinString(enabled_features_, ","));
command_line_->RemoveSwitch(switches::kDisableFeatures);
command_line_->AppendSwitchASCII(switches::kDisableFeatures,
JoinString(disabled_features_, ","));
}
void ScopedAddFeatureFlags::EnableIfNotSet(const Feature& feature) {
AddFeatureIfNotSet(feature, /*suffix=*/"", /*enable=*/true);
}
void ScopedAddFeatureFlags::EnableIfNotSetWithParameter(
const Feature& feature,
std::string_view name,
std::string_view value) {
std::string suffix = StrCat({":", name, "/", value});
AddFeatureIfNotSet(feature, suffix, true /* enable */);
}
void ScopedAddFeatureFlags::DisableIfNotSet(const Feature& feature) {
AddFeatureIfNotSet(feature, /*suffix=*/"", /*enable=*/false);
}
bool ScopedAddFeatureFlags::IsEnabled(const Feature& feature) {
return IsEnabledWithParameter(feature, /*parameter_name=*/"",
/*parameter_value=*/"");
}
bool ScopedAddFeatureFlags::IsEnabledWithParameter(
const Feature& feature,
std::string_view parameter_name,
std::string_view parameter_value) {
std::string feature_name = feature.name;
if (!parameter_name.empty()) {
StrAppend(&feature_name, {":", parameter_name, "/", parameter_value});
}
if (Contains(disabled_features_, feature_name)) {
return false;
}
if (Contains(enabled_features_, feature_name)) {
return true;
}
return feature.default_state == FEATURE_ENABLED_BY_DEFAULT;
}
void ScopedAddFeatureFlags::AddFeatureIfNotSet(const Feature& feature,
std::string_view suffix,
bool enable) {
std::string feature_name = StrCat({feature.name, suffix});
if (Contains(enabled_features_, feature_name) ||
Contains(disabled_features_, feature_name)) {
return;
}
if (enable) {
enabled_features_.emplace_back(feature_name);
} else {
disabled_features_.emplace_back(feature_name);
}
}
} // namespace base
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