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      1 // Copyright 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 CHROME_BROWSER_PROFILE_RESETTER_JTL_INTERPRETER_H_
      6 #define CHROME_BROWSER_PROFILE_RESETTER_JTL_INTERPRETER_H_
      7 
      8 #include <string>
      9 
     10 #include "base/basictypes.h"
     11 #include "base/values.h"
     12 
     13 // Executes a JTL program on a given dictionary.
     14 //
     15 // JTL (Json Traversal Language) programs are defined in jtl_foundation.h
     16 class JtlInterpreter {
     17  public:
     18   enum Result {
     19     OK,
     20     PARSE_ERROR,
     21     RUNTIME_ERROR,
     22     RESULT_MAX,
     23   };
     24 
     25   // |hasher_seed| is a value used in jtl_foundation::Hasher. All node names,
     26   // strings, integers and doubles are hashed before being compared to hash
     27   // values listed in |program|.
     28   // |program| is a byte array containing a JTL program.
     29   // |input| is a dictionary on which the program is evaluated.
     30   JtlInterpreter(const std::string& hasher_seed,
     31                  const std::string& program,
     32                  const DictionaryValue* input);
     33   ~JtlInterpreter();
     34 
     35   void Execute();
     36 
     37   Result result() const { return result_; }
     38   const DictionaryValue* working_memory() const {
     39     return working_memory_.get();
     40   }
     41   bool GetOutputBoolean(const std::string& unhashed_key, bool* output) const;
     42   bool GetOutputString(const std::string& unhashed_key,
     43                        std::string* output) const;
     44 
     45  private:
     46   // Input.
     47   std::string hasher_seed_;
     48   std::string program_;
     49   const DictionaryValue* input_;
     50   // Output.
     51   scoped_ptr<DictionaryValue> working_memory_;
     52   Result result_;
     53 
     54   DISALLOW_COPY_AND_ASSIGN(JtlInterpreter);
     55 };
     56 
     57 #endif  // CHROME_BROWSER_PROFILE_RESETTER_JTL_INTERPRETER_H_
     58