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// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_PROFILE_RESETTER_JTL_INTERPRETER_H_
#define CHROME_BROWSER_PROFILE_RESETTER_JTL_INTERPRETER_H_
#include <string>
#include "base/basictypes.h"
#include "base/values.h"
// Executes a JTL program on a given dictionary.
//
// JTL (Json Traversal Language) programs are defined in jtl_foundation.h
class JtlInterpreter {
public:
enum Result {
OK,
PARSE_ERROR,
RUNTIME_ERROR,
RESULT_MAX,
};
// |hasher_seed| is a value used in jtl_foundation::Hasher. All node names,
// strings, integers and doubles are hashed before being compared to hash
// values listed in |program|.
// |program| is a byte array containing a JTL program.
// |input| is a dictionary on which the program is evaluated.
JtlInterpreter(const std::string& hasher_seed,
const std::string& program,
const base::DictionaryValue* input);
~JtlInterpreter();
void Execute();
Result result() const { return result_; }
const base::DictionaryValue* working_memory() const {
return working_memory_.get();
}
bool GetOutputBoolean(const std::string& unhashed_key, bool* output) const;
bool GetOutputString(const std::string& unhashed_key,
std::string* output) const;
// Generates a checksum of the loaded program, defined as the first 3 bytes of
// the program's SHA-256 hash interpreted as a big-endian integer.
int CalculateProgramChecksum() const;
private:
// Input.
std::string hasher_seed_;
std::string program_;
const base::DictionaryValue* input_;
// Output.
scoped_ptr<base::DictionaryValue> working_memory_;
Result result_;
DISALLOW_COPY_AND_ASSIGN(JtlInterpreter);
};
#endif // CHROME_BROWSER_PROFILE_RESETTER_JTL_INTERPRETER_H_
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