tools/gn/import_manager.h

   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_