CSCI-1200/labs/13_exceptions_inheritance/cp2/simple_main.cpp

#include <cassert>
#include <iostream>
#include <fstream>
#include <sstream>
#include <vector>
#include <cstdlib>
#include <algorithm>

#include "polygons.h"

// helper function prototypes
Polygon* CreatePolygon(const std::string &name, const std::vector<Point> &points);
void OutputStats(const std::vector<Polygon*> &polygons, std::ofstream &ostr);

// ------------------------------------------------------------------------------

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

  // command line arguments & opening files
  if (argc != 3) { 
    std::cerr << "Usage: " << argv[0] << " input.txt output.txt" << std::endl; 
    exit(1);
  }
  std::ifstream istr(argv[1]);
  if (!istr) {
    std::cerr << "ERROR: could not open " << argv[1] << std::endl; 
    exit(1);
  }    
  std::ofstream ostr(argv[2]);
  if (!ostr) {
    std::cerr << "ERROR: could not open " << argv[2] << std::endl; 
    exit(1);
  }    

  // the master container of polygons
  std::vector<Polygon*> polygons;

  // read the input file one line at a time
  std::string line;
  while (getline(istr,line)) {
    std::stringstream ss(line);
    std::string name, token;
    if (!(ss >> name)) continue;
    std::vector<Point> points;
    while (ss >> token) {
      std::stringstream ss2(token);
      char c;
      double x,y;
      ss2 >> c;
      assert (c == '(');
      ss2 >> x;
      ss2 >> c;
      assert (c == ',');
      ss2 >> y;
      ss2 >> c;
      assert (c == ')');
      points.push_back(Point(x,y));
    }   
    assert (points.size() >= 3);
    Polygon* p = CreatePolygon(name,points);
    // add the new polygon to the master container
    polygons.push_back(p);
  }

  // write out the statistics
  OutputStats(polygons,ostr);

  // delete the dynamically allocated polygons
  for (int i = 0; i < polygons.size(); i++) {
    delete polygons[i];
  }
}

// ------------------------------------------------------------------------------

// This function determines the most specific type of shape that can
// be created from the sequence of points.  It does this by process of
// elimination.  Note that the order in which it attempts to create
// the shapes is important.

Polygon* CreatePolygon(const std::string &name, const std::vector<Point> &points) {
  Polygon *answer = NULL;
  try{
    answer = new EquilateralTriangle(name,points);
  } 
  catch (int) { 
    try {
      answer= new IsoscelesTriangle(name,points);
    }
    catch (int) {
      try {
        answer= new Triangle(name,points);
      }
      catch (int) {
        try {
          answer= new Square(name,points);
        }
        catch (int) {
          try {
            answer= new Rectangle(name,points);
          }
          catch (int) {
            try {
              answer= new Quadrilateral(name,points);
            }
            catch (int) {
              answer= new Polygon(name,points);
            }
          }
	}
      }
    }
  }
  assert (answer != NULL);
  return answer;
}

// ------------------------------------------------------------------------------

// This function prints the output.  C++ macros are used to abbreviate
// some repetitive code.  The function call-like macros are actually
// replaced using substitution by the preprocessor before the code is
// given to the compiler.  (You are not required to understand the
// details of the macros.  You do not need to edit this code.)

void OutputStats(const std::vector<Polygon*> &polygons, std::ofstream &ostr) {

  // define and initialize variables
# define InitializeCount(type) std::vector<std::string> all_##type
  InitializeCount(Polygon);
  InitializeCount(Triangle);
  InitializeCount(IsoscelesTriangle);
  InitializeCount(EquilateralTriangle);
  InitializeCount(Quadrilateral);
  InitializeCount(Rectangle);
  InitializeCount(Square);  
  std::vector<std::string> equal_sides;

  // count & record the names of shapes in each category
  for (std::vector<Polygon*>::const_iterator i = polygons.begin(); i!=polygons.end(); ++i) {
#   define IncrementCount(type) if (dynamic_cast<type*> (*i)) all_##type.push_back((*i)->getName())
    IncrementCount(Polygon);
    IncrementCount(Triangle);
    IncrementCount(IsoscelesTriangle);
    IncrementCount(EquilateralTriangle);
    IncrementCount(Quadrilateral);
    IncrementCount(Rectangle);
    IncrementCount(Square);
    if ((*i)->HasAllEqualSides()) equal_sides.push_back((*i)->getName());
  }    


  // output data for each category, sorted alphabetically by the shape's name
# define PrintVector(vecname) std::sort((vecname).begin(),(vecname).end()); \
  for (unsigned int j = 0; j < (vecname).size(); j++) { ostr << " " << (vecname)[j]; } ostr << std::endl
# define PrintCount(type) do { ostr << all_##type.size() << " " #type"(s): "; PrintVector(all_##type); } while (0)
  PrintCount(Polygon);
  PrintCount(Triangle);
  PrintCount(IsoscelesTriangle);
  PrintCount(EquilateralTriangle);
  PrintCount(Quadrilateral);
  PrintCount(Rectangle);
  PrintCount(Square);
  ostr << equal_sides.size() << " Shape(s) with all equal sides: ";
  PrintVector(equal_sides);
}

// ------------------------------------------------------------------------------