Skriva program för att översätta NC-kod från nc .tap till EMCO format

#include <iostream>
#include <fstream>
#include <sstream>
#include <list>

typedef std::list<char> symbol_list;
typedef std::list<double> number_list;

// Formats a number into a string of size 4, with leading zeroes.
std::string line_nr_to_str(int line_nr)
{
	std::stringstream ss;
	std::string str;
	ss.fill('0');
	ss.width(4);
	ss << line_nr;
	ss >> str;
	return str;
}

int main(int argc, char **argv)
{
	if(argc <= 1)
	{
		std::cout << "Usage: " << argv[0] << " input_file" << std::endl;
		return 0;
	}

	// Open input and output files.
	std::ifstream input(argv[1]);
	std::string output_filename = argv[1];
	output_filename += ".emco";
	std::ofstream output(output_filename.c_str());

	std::string str;
	int line_number = 0;

	// Read the file line by line.
	while(std::getline(input, str))
	{
		// Output the line number.
		output << 'N' << line_nr_to_str(line_number) << ' ';

		// Parse the line into symbols and numbers.
		std::stringstream ss(str);
		symbol_list symbols;
		number_list numbers;

		char c;
		double d;
		while((ss >> c))
		{
			symbols.push_back(c);

			if(ss >> d)
			{
				numbers.push_back(d);
			}
		}

		// If the number of symbols and numbers differs something is wrong.
		if(symbols.size() != numbers.size())
		{
			std::cout << "Invalid data format!" << std::endl;
			return 1;
		}

		symbol_list::iterator s_end = symbols.end();
		symbol_list::iterator symbol = symbols.begin();
		number_list::iterator number = numbers.begin();

		// For each symbol-number pair
		for(; symbol != s_end; ++symbol, ++number)
		{
			// Output the symbol.
			output << *symbol;

			// Output the number, with some special cases.
			switch(*symbol)
			{
				case 'G':
				case 'M':
					output << '0' << *number; 	
					break;
				case 'T':
					output << '0' << *number << '0' << *number;
					break;
				default:
					output << *number;
					break;
			}

			output << ' ';
		}

		// Finally, increment the line number.
		line_number += 10;
		output << '\n';
	}
}