/////////////////////////////////////////////////////////////////////
//  grammar.cpp - provides detectors for grammatical constructs    //
//  ver 1.0                                                        //
//                                                                 //
//  Language:     Visual C++, ver 7.0                              //
//  Platfrom:     Dell Dimension 8100, Windows 2000, SP 2.0        //
//  Application:  Prototype for CSE687 Pr#2, Spring 2003           //
//  Author:       Jim Fawcett, CST 2-187, Syracuse University      //
//                (315) 443-3948, jfawcett@twcny.rr.com            //
/////////////////////////////////////////////////////////////////////

#include "grammar.h"

//----< is this string a special key? >------------------------

bool grammar::specialKeys(const std::string &s)
{
  static string keys[4] = { "for", "if", "switch", "while" };
  for(int i=0; i<4; ++i)
    if(s==keys[i])
      return true;
  return false;
}
//----< beginning of a function definition? >------------------

bool grammar::functionDef()
{
  if(_se[_se.length()-1] != std::string("{"))
    return false;
  size_t len = _se.find("(");
  if(len == _se.length())
    return false;
  if(specialKeys(_se[len-1]))
    return false;
  return true;
}
//----< a declaration> >---------------------------------------

bool grammar::declar()
{
  return false;
}
//
#ifdef TEST_GRAMMAR

#include <iostream>
#include <fstream>

int main(int argc, char *argv[])
{
  if(argc==1)
  {
    cout << "\n  please enter name of file to process on command line\n\n";
    return 1;
  }
  ifstream in(argv[1]);
  if(!in.good())
  {
    cout << "\n  can't read file " << argv[1] << "\n\n";
    return 1;
  }
  semiExp se(in);
  while(se.get())
  {
    se.display();
    if(grammar(se).include())
      cout << "    is an include statement" << "\n\n";
    else if(grammar(se).functionDef())
      cout << "    is a function definition" << "\n\n";
  }  
}
#endif