bison

%{
  #include <iostream>
  #include <map>
  #include <string>
  #include <vector>
  using namespace std;
  extern FILE *yyin;
  extern int yylex ();
  int yyerror(char *s) { printf("%s\n", s); }

  map<string, int> variables; //map string et int adresse en memoire avec un compteur memoire entier 0,1,2,3,4
  map<string,int>::iterator itvar;
  //memoire vector double qu'on utilisera ensuite dans le run (une adresse memoire en gros)
  vector<double> memory;
  vector<string> fMemory;
  int incmemory = 0;
  int incFmemory = 0;

  vector<pair<int,double>> instructions;
  int ic = 0;   // compteur instruction
  inline ins(int c, double d) { instructions.push_back(make_pair(c,d)); ic++;};

  // structure pour stocker les adresses pour les sauts condistionnels et autres...
  typedef struct adr {
    int ic_goto;
    int ic_false;
  } t_adresse;

%}

%union
{
  double valeur;
  char nom[50];
  t_adresse adresse;
}

%token <valeur> NUMBER
%token <nom> VARIABLE
%token <nom> TEXT
%type <valeur> expression
%token <adresse> SI
%token ALORS
%token SINON
%token FINSI
%token REPEAT

%token JMP
%token JNZ
%token OUT

%token PRINT
%left ASK

%token DOUBLE_EGAL
%token SUP_EGAL
%token SUP_STRICT
%token INF_EGAL
%token INF_STRICT


%left '+' '-'     /* associativité à gauche */
%left '*' '/'     /* associativité à gauche */
%token '=' '&'

%%
bloc : bloc instruction '\n'
      |    /* Epsilon */
      ;
instruction : expression { ins (OUT,0);   /* imprimer le résultat de l'expression */  }
            | VARIABLE '=' expression     { if ( variables.find($1) == variables.end() ) {
                                                variables[$1] = incmemory;
                                                memory.push_back(0) ;
                                                incmemory++;
                                            }
                                            ins('=', variables[$1]);}
            | SI expression '\n' { $1.ic_goto = ic;
                                   ins (JNZ,0);    }
              ALORS '\n' bloc    { $1.ic_false = ic;
                                   ins (JMP,0);
                                   instructions[$1.ic_goto].second = ic;
                                  }
              SINON '\n' bloc    { instructions[$1.ic_false].second = ic; }
              FINSI              {   }

            | REPEAT '(' expression ')' expression {

                                                   }
            | ASK '(' VARIABLE ')' { if ( variables.find($3) == variables.end() ) {
                                          variables[$3] = incmemory;
                                          memory.push_back(0) ;
                                          incmemory++;
                                      }
                                      ins(ASK,variables[$3]);
                                    }
            |   /* Ligne vide*/
            ;
expression: expression '+' expression             { ins('+', 0);}
          | expression '-' expression             { ins('-', 0);}
          | expression '*' expression             { ins('*', 0);}
          | expression '/' expression             { ins('/', 0);}

          | expression DOUBLE_EGAL expression     { ins(DOUBLE_EGAL, 0);}
          | expression SUP_EGAL expression        { ins(SUP_EGAL,0);}
          | expression SUP_STRICT expression      { ins(SUP_STRICT,0);}
          | expression INF_EGAL expression        { ins(INF_EGAL,0);}
          | expression INF_STRICT expression      { ins(INF_STRICT,0);}
          | '(' expression ')'                    { }
          | PRINT '(' expression ')'              {ins(PRINT,$3);}
          | NUMBER                                { ins(NUMBER, $1);}
          | VARIABLE                              { if ( variables.find($1) == variables.end() ) {
                                                        variables[$1] = incmemory;
                                                        memory.push_back(0) ;
                                                        incmemory++;
                                                    }
                                                    ins(VARIABLE, variables[$1]);
                                                  }
          | TEXT                                  {
                                                  }
          ;
%%


// Pour imprimer le code généré de manière plus lisible
string nom(int instruction){
  switch (instruction){
   case '+'         : return "ADD";
   case '*'         : return "MUL";
   case '-'         : return "MIN";
   case '/'         : return "DIV";
   case '='         : return "EQU";
   case DOUBLE_EGAL : return "EG?";
   case SUP_EGAL    : return "SE?";
   case SUP_STRICT  : return "SS?";
   case INF_EGAL    : return "IE?";
   case INF_STRICT  : return "IS?";
   case NUMBER      : return "NUM";
   case VARIABLE    : return "VAR";
   case TEXT        : return "TXT";
   case OUT         : return "OUT";
   case JNZ         : return "JNZ";   // Jump if not zero
   case JMP         : return "JMP";   // Unconditional Jump
   case ASK         : return "ASK";
   case PRINT       : return "PRT";
   default  : return to_string (instruction);
   }
}

void print_program(){
  cout << "==== CODE GENERE ====" << endl;
  int i = 0;
  for (auto ins : instructions )
    cout << i++ << '\t' << nom(ins.first) << "\t" << ins.second << endl;
  cout << "=====================" << endl;
}

double depiler(vector<double> &pile) {
  double t = pile[pile.size()-1];
  cout << "Dépiler " << t << endl;
  pile.pop_back();
  return t;
}

void run_program(){
  vector<double> pile;
  double x,y;
  int memoryMark;
  string varName;

  cout << "===== EXECUTION =====" << endl;
  ic = 0;
  while ( ic < instructions.size() ){
    auto ins = instructions[ic];
    //cout << ic << '\t' << nom(ins.first) << "\t" << ins.second << endl;

    switch(ins.first){
      case '+':
        x = depiler(pile);
        y = depiler(pile);
        pile.push_back(y+x);
        ic++;
      break;

      case '*':
        x = depiler(pile);
        y = depiler(pile);
        pile.push_back(y*x);
        ic++;
      break;

      case '-':
        x = depiler(pile);
        y = depiler(pile);
        pile.push_back(y-x);
        ic++;
      break;

      case '/':
        x=depiler(pile);
        y=depiler(pile);
        pile.push_back(y/x);
        ic++;
      break;

      case '=':
        x = depiler(pile);
        memory[ins.second] = x;
        pile.push_back(memory[(int)ins.second]);
        ic++;
      break;

      case DOUBLE_EGAL:
        x=depiler(pile);
        y=depiler(pile);
        if(y == x){pile.push_back(1);}
        else{pile.push_back(0);}
        ic++;
      break;

      case SUP_EGAL:
        x=depiler(pile);
        y=depiler(pile);
        if(y >= x){pile.push_back(1);}
        else{pile.push_back(0);}
        ic++;
      break;

      case SUP_STRICT:
        x=depiler(pile);
        y=depiler(pile);
        if(y > x){pile.push_back(1);}
        else{pile.push_back(0);}
        ic++;
      break;

      case INF_EGAL:
        x=depiler(pile);
        y=depiler(pile);
        if(y <= x){pile.push_back(1);}
        else{pile.push_back(0);}
        ic++;
      break;

      case INF_STRICT:
        x=depiler(pile);
        y=depiler(pile);
        if(y < x){pile.push_back(1);}
        else{pile.push_back(0);}
        ic++;
      break;

      case NUMBER :
        x = ins.second;
        pile.push_back(x);
        ic++;
      break;

      case VARIABLE :
        memoryMark = (int)ins.second;
        cout << "pos = " << memoryMark << endl;
        x = memory[memoryMark];
        pile.push_back(x);
        ic++;
      break;

      case PRINT:
        cout << ins.second << endl;
        ic++;
      break;

      case JMP :
        ic = ins.second;
      break;

      case JNZ :
        x = depiler(pile);
        ic = ( x ? ic + 1 : ins.second);
      break;

      case ASK :
        for (auto it = variables.begin(); it != variables.end(); ++it)
        { if (it->second == ins.second){ varName = it->first; }; }
          cout << varName << " : ";
          cin >> memory[ins.second];
        ic++;
      break;

      case OUT :
        cout << "Résultat : " << depiler(pile) << endl;
        ic++;
      break;
    }
  }
  cout << "=====================" << endl;
}

int main(int argc, char **argv) {

  if ( argc > 1 )
    yyin = fopen( argv[1], "r" );
  else
    yyin = stdin;
  yyparse();

  print_program();

  run_program();

}