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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.
#ifndef BASE_SCOPED_ADD_FEATURE_FLAGS_H_
#define BASE_SCOPED_ADD_FEATURE_FLAGS_H_
#include <string>
#include <vector>
#include "base/base_export.h"
#include "base/feature_list.h"
#include "base/memory/raw_ptr.h"
namespace base {
class CommandLine;
// Helper class to enable and disable features if they are not already set in
// the command line. It reads the command line on construction, allows user to
// enable and disable features during its lifetime, and writes the modified
// --enable-features=... and --disable-features=... flags back to the command
// line on destruction.
class BASE_EXPORT ScopedAddFeatureFlags {
public:
explicit ScopedAddFeatureFlags(CommandLine* command_line);
ScopedAddFeatureFlags(const ScopedAddFeatureFlags&) = delete;
ScopedAddFeatureFlags& operator=(const ScopedAddFeatureFlags&) = delete;
~ScopedAddFeatureFlags();
// Any existing (user set) enable/disable takes precedence.
void EnableIfNotSet(const Feature& feature);
void DisableIfNotSet(const Feature& feature);
void EnableIfNotSetWithParameter(const Feature& feature,
StringPiece name,
StringPiece value);
// Check if the feature is enabled from command line or functions above
bool IsEnabled(const Feature& feature);
// Check if the feature with the given parameter name and value is enabled
// from command line or functions above. An empty parameter name means that we
// are checking if the feature is enabled without any parameter.
bool IsEnabledWithParameter(const Feature& feature,
StringPiece parameter_name,
StringPiece parameter_value);
private:
void AddFeatureIfNotSet(const Feature& feature,
StringPiece suffix,
bool enable);
const raw_ptr<CommandLine> command_line_;
std::vector<std::string> enabled_features_;
std::vector<std::string> disabled_features_;
};
} // namespace base
#endif // BASE_SCOPED_ADD_FEATURE_FLAGS_H_
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