| // Copyright 2018 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_METADATA_H_ |
| #define TOOLS_GN_METADATA_H_ |
| |
| #include <memory> |
| |
| #include "gn/build_settings.h" |
| #include "gn/scope.h" |
| #include "gn/source_dir.h" |
| |
| extern const char kMetadata_Help[]; |
| |
| // Metadata about a particular target. |
| // |
| // Metadata is a collection of keys and values relating to a particular target. |
| // Generally, these keys will include three categories of strings: ordinary |
| // strings, filenames intended to be rebased according to their particular |
| // source directory, and target labels intended to be used as barriers to the |
| // walk. Verfication of these categories occurs at walk time, not creation |
| // time (since it is not clear until the walk which values are intended for |
| // which purpose). |
| // |
| // Represented as a scope in the expression language, here it is reduced to just |
| // the KeyValueMap (since it doesn't need the logical overhead of a full scope). |
| // Values must be lists of strings, as the walking collection logic contatenates |
| // their values across targets. |
| class Metadata { |
| public: |
| using Contents = Scope::KeyValueMap; |
| |
| Metadata() = default; |
| |
| const ParseNode* origin() const { return origin_; } |
| void set_origin(const ParseNode* origin) { origin_ = origin; } |
| |
| // The contents of this metadata varaiable. |
| const Contents& contents() const { return contents_; } |
| Contents& contents() { return contents_; } |
| void set_contents(Contents&& contents) { contents_ = std::move(contents); } |
| |
| // The relative source directory to use when rebasing. |
| const SourceDir& source_dir() const { return source_dir_; } |
| SourceDir& source_dir() { return source_dir_; } |
| void set_source_dir(const SourceDir& d) { source_dir_ = d; } |
| |
| // Collect the specified metadata from this instance. |
| // |
| // Calling this will populate `next_walk_keys` with the values of targets to |
| // be walked next (with the empty string "" indicating that the target should |
| // walk all of its deps and data_deps). |
| bool WalkStep(const BuildSettings* settings, |
| const std::vector<std::string>& keys_to_extract, |
| const std::vector<std::string>& keys_to_walk, |
| const SourceDir& rebase_dir, |
| std::vector<Value>* next_walk_keys, |
| std::vector<Value>* result, |
| Err* err) const; |
| |
| private: |
| const ParseNode* origin_ = nullptr; |
| Contents contents_; |
| SourceDir source_dir_; |
| |
| std::pair<Value, bool> RebaseValue(const BuildSettings* settings, |
| const SourceDir& rebase_dir, |
| const Value& value, |
| Err* err) const; |
| |
| std::pair<Value, bool> RebaseStringValue(const BuildSettings* settings, |
| const SourceDir& rebase_dir, |
| const Value& value, |
| Err* err) const; |
| |
| std::pair<Value, bool> RebaseListValue(const BuildSettings* settings, |
| const SourceDir& rebase_dir, |
| const Value& value, |
| Err* err) const; |
| |
| std::pair<Value, bool> RebaseScopeValue(const BuildSettings* settings, |
| const SourceDir& rebase_dir, |
| const Value& value, |
| Err* err) const; |
| |
| DISALLOW_COPY_AND_ASSIGN(Metadata); |
| }; |
| |
| #endif // TOOLS_GN_METADATA_H_ |