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// Copyright (c) 2013 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.
#ifndef TOOLS_GN_CONFIG_H_
#define TOOLS_GN_CONFIG_H_
#include "base/logging.h"
#include "base/macros.h"
#include "tools/gn/config_values.h"
#include "tools/gn/item.h"
#include "tools/gn/label_ptr.h"
#include "tools/gn/unique_vector.h"
// Represents a named config in the dependency graph.
//
// A config can list other configs. We track both the data assigned directly
// on the config, this list of sub-configs, and (when the config is resolved)
// the resulting values of everything merged together. The flatten step
// means we can avoid doing a recursive config walk for every target to compute
// flags.
class Config : public Item {
public:
Config(const Settings* settings, const Label& label);
~Config() override;
// Item implementation.
Config* AsConfig() override;
const Config* AsConfig() const override;
bool OnResolved(Err* err) override;
// The values set directly on this config. This will not contain data from
// sub-configs.
ConfigValues& own_values() { return own_values_; }
const ConfigValues& own_values() const { return own_values_; }
// The values that represent this config and all sub-configs combined into
// one. This is only valid after the config is resolved (when we know the
// contents of the sub-configs).
const ConfigValues& resolved_values() const {
DCHECK(resolved_);
if (configs_.empty()) // No sub configs, just use the regular values.
return own_values_;
return composite_values_;
}
// List of sub-configs.
const UniqueVector<LabelConfigPair>& configs() const { return configs_; }
UniqueVector<LabelConfigPair>& configs() { return configs_; }
private:
ConfigValues own_values_;
// Contains the own_values combined with sub-configs. Most configs don't have
// sub-configs. So as an optimization, this is not populated if there are no
// items in configs_. The resolved_values() getter handles this.
bool resolved_;
ConfigValues composite_values_;
UniqueVector<LabelConfigPair> configs_;
DISALLOW_COPY_AND_ASSIGN(Config);
};
#endif // TOOLS_GN_CONFIG_H_
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