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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 base::DictionaryValue* input); | |
33 ~JtlInterpreter(); | |
34 | |
35 void Execute(); | |
36 | |
37 Result result() const { return result_; } | |
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_ | |
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