fsa_impl.hpp
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/*
* File: _simple_fsa_impl.hpp
* Author: mlenart
*
* Created on October 20, 2013, 12:25 PM
*/
#ifndef _SIMPLE_FSA_IMPL_HPP
#define _SIMPLE_FSA_IMPL_HPP
#include <cstring>
#include <algorithm>
#include <utility>
#include <iostream>
#include <vector>
#include <string>
#include <sstream>
#include "const.hpp"
#include "../utils.hpp"
#include "../endianness.hpp"
//using namespace std;
//static const unsigned int FSA_OFFSET = 6;
template <class T>
bool FSA<T>::tryToRecognize(const char* input, T& value) const {
State<T> currState = this->getInitialState();
int i = 0;
while (!currState.isSink() && input[i] != '\0') {
#ifdef DEBUG_BUILD
cerr << "proceed to next " << input[i] << endl;
#endif
currState.proceedToNext(this, input[i]);
i++;
}
// input[i] == '\0'
// currState.proceedToNext(0);
if (currState.isAccepting()) {
value = currState.getValue();
// DEBUG(string("recognized: ")+input);
return true;
} else {
return false;
}
}
template <class T>
FSA<T>::FSA(const unsigned char* initialStatePtr, const Deserializer<T>& deserializer)
: initialStatePtr(initialStatePtr), deserializer(deserializer) {
}
template <class T>
State<T> FSA<T>::getInitialState() const {
return State<T>();
}
template <class T>
FSA<T>* FSA<T>::getFSA(const std::string& filename, const Deserializer<T>& deserializer) {
return getFSA(readFile<unsigned char>(filename.c_str()), deserializer);
}
template <class T>
FSA<T>* FSA<T>::getFSA(const unsigned char* ptr, const Deserializer<T>& deserializer) {
uint32_t magicNumber = ntohl(*((const uint32_t*) ptr));
if (magicNumber != MAGIC_NUMBER) {
throw FileFormatException("Invalid file format");
}
uint8_t versionNum = *(ptr + VERSION_NUM_OFFSET);
if (versionNum != VERSION_NUM) {
std::ostringstream oss;
oss << "Invalid file format version number: " << (int) versionNum << ", should be: " << (int) VERSION_NUM;
throw FileFormatException(oss.str());
}
uint8_t implementationNum = *(ptr + IMPLEMENTATION_NUM_OFFSET);
const unsigned char* startPtr = ptr + FSA_DATA_OFFSET;
switch (implementationNum) {
case 0:
return new SimpleFSA<T>(startPtr, deserializer);
case 1:
return new CompressedFSA1<T>(startPtr, deserializer);
case 2:
return new CompressedFSA2<T>(startPtr, deserializer);
default:
std::ostringstream oss;
oss << "Invalid implementation number: " << versionNum << ", should be: " << VERSION_NUM;
throw FileFormatException(oss.str());
}
}
#endif /* _SIMPLE_FSA_IMPL_HPP */