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      1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef TOOLS_GN_IMPORT_MANAGER_H_
      6 #define TOOLS_GN_IMPORT_MANAGER_H_
      7 
      8 #include <map>
      9 
     10 #include "base/synchronization/lock.h"
     11 
     12 class Err;
     13 class ParseNode;
     14 class Scope;
     15 class SourceFile;
     16 
     17 // Provides a cache of the results of importing scopes so the results can
     18 // be re-used rather than running the imported files multiple times.
     19 class ImportManager {
     20  public:
     21   ImportManager();
     22   ~ImportManager();
     23 
     24   // Does an import of the given file into the given scope. On error, sets the
     25   // error and returns false.
     26   bool DoImport(const SourceFile& file,
     27                 const ParseNode* node_for_err,
     28                 Scope* scope,
     29                 Err* err);
     30 
     31  private:
     32   base::Lock lock_;
     33 
     34   // Owning pointers to the scopes.
     35   typedef std::map<SourceFile, const Scope*> ImportMap;
     36   ImportMap imports_;
     37 
     38   DISALLOW_COPY_AND_ASSIGN(ImportManager);
     39 };
     40 
     41 #endif  // TOOLS_GN_IMPORT_MANAGER_H_
     42