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 base::DictionaryValue* input); 33 ~JtlInterpreter(); 34 35 void Execute(); 36 result()37 Result result() const { return result_; } working_memory()38 const base::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 // Generates a checksum of the loaded program, defined as the first 3 bytes of 46 // the program's SHA-256 hash interpreted as a big-endian integer. 47 int CalculateProgramChecksum() const; 48 49 private: 50 // Input. 51 std::string hasher_seed_; 52 std::string program_; 53 const base::DictionaryValue* input_; 54 // Output. 55 scoped_ptr<base::DictionaryValue> working_memory_; 56 Result result_; 57 58 DISALLOW_COPY_AND_ASSIGN(JtlInterpreter); 59 }; 60 61 #endif // CHROME_BROWSER_PROFILE_RESETTER_JTL_INTERPRETER_H_ 62