/////////////////////////////////////////////////////////////////////
//  demoFiles.cpp - demonstrate grammar using semiExpressions      //
//                                                                 //
//  Jim Fawcett, CSE687 - Object Oriented Design, Spring 2002      //
/////////////////////////////////////////////////////////////////////

#include <fstream>
#include <strstream>
#include "semi.h"
using namespace std;

void main(int argc, char *argv[]) {

  ifstream in;

  if(argc == 1) {
    cout << "\n  please enter names of files to process\n";
    return;
  }

  cout << "\n  Demonstrate Grammar Processing and File Manipulations "
       << "\n =======================================================\n";
  int i;
  for(i=1; i<argc; i++) {
    in.open(argv[i]);
    if(!in.good()) {
      cout << "\n  can't open file " << argv[i] << "\n\n";
      continue;
    }

    cout << "\n  Looking for Preprocessor Statements in " << argv[i] << "\n\n";

    semiExp se(in);
    while(se.get()) {
      if(se[0] == "#")
        se.display();
      se.flush();
    }
    cout << "\n  Rewinding File and looking for length of prologue\n\n";

    in.clear();
    in.seekg(0,ios::beg);
    int preProcCount = 0;
    int lineCount = se.lines();
    while(se.get()) {
      if(se[0] == "#") {
        ++preProcCount;
        if(preProcCount > 2) {

          ////////////////////////////////////////
          // we are starting to include files
          // so prologue is finished

          cout << "\n  prologue length = " 
               << (se.lines() - preProcCount - lineCount - 1) << "\n\n";
          break;
        }
      }
      else if(se[0] == "\n")    // prologue contains newlines
        continue;
      else {

        ////////////////////////////////////////////
        // we've encountered a semiexpression that
        // is not a preproc - remember that comments
        // are thrown away though their newlines are
        // counted - so this must be part of the code

        cout << "\n  prologue length = " 
             << (se.lines() - preProcCount - lineCount - 1) << "\n\n";
        break;
      }
      se.display();
      se.flush();
    }

    in.close();
    in.clear();
  }
  cout << "\n\n";
}