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#include <fstream>
#include <string>
#include <vector>
#include <iomanip>
#include <iostream>
using namespace std;
enum statetype {newtkn, resvd, var, intr, real, del1, laststate};
enum chartype {letter, digit, period, del2, blank, pod, eoln, illegal, lastchar};
void readreserve(vector<string>&);
void writereserve(vector<string>&, ofstream&);
void readstate(vector<vector<statetype>>&);
void writestate(vector<vector<statetype>>&, ofstream&);
void readaction(vector<vector<int>>&);
void writeaction(vector<vector<int>>&, ofstream&);
void writeexp(ofstream&);
string enumtostring(statetype);
statetype strtoenum(string);
chartype charreturn(char);
void compresvd(vector<string>&, string, statetype&);
void takeaction(int, string&, char, statetype&, vector<string>&, ofstream&);
void tokenizer(vector<string>&, vector<vector<statetype>>&, vector<vector<int>>&, ofstream&);
int main()
{
ofstream _outf("output.dat");
vector<string> _resvdV;
vector<vector<int>> _actionV(laststate, vector<int>(lastchar));
vector<vector<statetype>> _FSM(laststate, vector<statetype>(lastchar));
readreserve(_resvdV);
writereserve(_resvdV, _outf);
readstate(_FSM);
writestate(_FSM, _outf);
readaction(_actionV);
writeaction(_actionV, _outf);
writeexp(_outf);
tokenizer(_resvdV, _FSM, _actionV, _outf);
_outf.close();
return 0;
}
void readreserve(vector<string>& _r)
{
ifstream _inf("reserve.dat");
string _temp;
while (!_inf.eof())
{
_inf >> _temp;
_r.push_back(_temp);
}
_inf.close();
}
void writereserve(vector<string>& _r, ofstream& _outf)
{
vector<string>::iterator iter;
_outf << "Reserved words:" <<
"\n---------------" << endl;
for (iter = _r.begin(); iter != _r.end(); ++iter)
{
_outf << *iter << " ";
}
_outf << endl << endl;
}
void readstate(vector<vector<statetype>>& _s)
{
ifstream _inf("statetable.dat");
string _temp;
for (int i = newtkn; i < laststate; i++)
for (int j = letter; j < lastchar; j++)
{
_inf >> _temp;
_s[i][j] = strtoenum(_temp);
}
_inf.close();
}
void writestate(vector<vector<statetype>>& _s, ofstream& _outf)
{
_outf << right << setw(58) << "State Table\n" <<
setw(58) <<"-----------\n";
_outf << left << setw(12) << " " << setw(12) << "Letter" << setw(12) << "Digit" <<
setw(12) << "Period" << setw(12) << "Delimiter" << setw(12) << "Blank" <<
setw(12) << "% or $" << setw(12) << "EOLN" << setw(12) << "Illegal" << endl;
_outf << left << setfill('-') << setw(108) << "-" << setfill(' ') << endl;
for (int i = newtkn; i < laststate; i++)
{
_outf << setw(10) << enumtostring((statetype)i) << "| ";
for (int j = letter; j < lastchar; j++)
_outf << setw(12) << enumtostring(_s[i][j]);
_outf << endl;
}
_outf << endl;
}
void readaction(vector<vector<int>>& _a)
{
ifstream _inf("actiontable.dat");
for (int i = newtkn; i < laststate; i++)
for (int j = letter; j < lastchar; j++)
_inf >> _a[i][j];
_inf.close();
}
void writeaction(vector<vector<int>>& _a, ofstream& _outf)
{
_outf << right << setw(59) << "Action Table\n" <<
setw(59) << "------------\n";
_outf << left << setw(12) << " " << setw(12) << "Letter" << setw(12) << "Digit" <<
setw(12) << "Period" << setw(12) << "Delimiter" << setw(12) << "Blank" <<
setw(12) << "% or $" << setw(12) << "EOLN" << setw(12) << "Illegal" << endl;
_outf << left << setfill('-') << setw(108) << "-" << setfill(' ') << endl;
for (int i = newtkn; i < laststate; i++)
{
_outf << setw(10) << enumtostring((statetype)i) << "| ";
for (int j = letter; j < lastchar; j++)
_outf << setw(12) << _a[i][j];
_outf << endl;
}
_outf << endl;
}
void writeexp(ofstream& _outf)
{
ifstream _inf("explanationofaction.dat");
string _temp;
_outf << "Explanation of Action Table entries: " <<
"\n------------------------------------" << endl;
while (!_inf.eof())
{
getline(_inf, _temp);
_outf << _temp << endl;
}
_outf << endl;
_inf.close();
}
string enumtostring(statetype _s)
{
string _temp;
if(_s == newtkn)
return "newtoken";
else if(_s == resvd)
return "reserved";
else if(_s == var)
return "variable";
else if(_s == intr)
return "integer";
else if(_s == real)
return "real";
else if(_s == del1)
return "delimeter";
else
return "laststate";
}
statetype strtoenum(string _s)
{
if (_s == "newtkn")
return newtkn;
else if (_s == "resvd")
return resvd;
else if (_s == "var")
return var;
else if (_s == "intr")
return intr;
else if (_s == "real")
return real;
else if (_s == "del1")
return del1;
else
return laststate;
}
chartype charreturn(char _ch)
{
if ((_ch >= 'A' && _ch <= 'Z') || (_ch >= 'a' && _ch <= 'z'))
return letter;
else if (_ch >= '0' && _ch <= '9')
return digit;
else if(_ch == '+'|| _ch == '-' || _ch == '/' || _ch == '*' ||
_ch == '^' || _ch == '=' || _ch == '<' || _ch == '>' ||
_ch == ',' || _ch == '\"' || _ch == '(' || _ch == ')')
return del2;
else if (_ch == ' ')
return blank;
else if (_ch == '%' || _ch == '$')
return pod;
else if (_ch == '\n')
return eoln;
else if (_ch == '.')
return period;
else
return illegal;
}
void compresvd(vector<string>& _resvdV, string _token, statetype& _st)
{
vector<string>::iterator iter;
for (iter = _resvdV.begin(); iter != _resvdV.end(); ++iter)
{
if (_token == *iter)
{
_st = resvd;
break;
}
else
_st = var;
}
}
void takeaction(int _act, string& _token, char _ch, statetype& _st, vector<string>& _resvdV, ofstream& _outf)
{
switch(_act)
{
case 1:
_token += _ch;
break;
case 2:
compresvd(_resvdV, _token, _st);
_outf << setw(8) << _token << setw(12) << enumtostring(_st) << endl;
_token = "";
break;
case 3:
_outf << setw(8) << _token << setw(12) << enumtostring(_st) << endl;
_token = "";
break;
case 4:
_outf << setw(8) << _token << setw(12) << enumtostring(_st) << endl <<
setw(8) << _ch << "Improper usage " << endl;
_token = "";
break;
case 5:
_outf << setw(8) << _ch << "Improper usage " << endl;
break;
case 6:
break;
case 7:
_outf << setw(8) << _ch << "Illegal character " << endl;
break;
case 8:
compresvd(_resvdV, _token, _st);
_outf << setw(8) << _token << setw(12) << enumtostring(_st) << endl;
_token = _ch;
break;
case 9:
_outf << setw(8) << _token << setw(12) << enumtostring(_st) << endl;
_token = _ch;
break;
case 10:
_token += _ch;
_st = var;
_outf << setw(8) << _token << setw(12) << enumtostring(_st) << endl;
_token = "";
break;
case 11:
compresvd(_resvdV, _token, _st);
_outf << setw(8) << _token << setw(12) << enumtostring(_st) <<
setw(8) << _ch << "Illegal character " << endl;
break;
case 12:
_token += _ch;
_outf << setw(8) << _token << setw(12) << enumtostring(_st) << endl;
_token = "";
break;
case 13:
_outf << setw(8) << _token << setw(12) << enumtostring(_st) <<
setw(8) << _ch << "Illegal character " << endl;
_token = "";
break;
}
}
void tokenizer(vector<string>& _resvdV, vector<vector<statetype>>& _FSM, vector<vector<int>>& _actionV, ofstream& _outf)
{
ifstream _inf("prog1.bas");
char _ch;
int _act;
chartype _ct;
string _token = "";
statetype _st = newtkn;
_outf << left << setw(8) << "Token:" << setw(12) << "Token type:" << endl;
while (!_inf.eof())
{
_inf.get(_ch);
_ct = charreturn(_ch);
_act = _actionV[_st][_ct];
takeaction(_act, _token, _ch, _st, _resvdV, _outf);
_st = _FSM[_st][_ct];
}
_inf.close();
}
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