Interpreter.java

import java.io.File;
import java.io.FileNotFoundException;
import java.util.*;

/**
 * the main class, runs all the sub-routinse
 */
public class Interpreter {
    public static void main(String[] args) {
        // spaces define new arguments, and as the program only takes 1, the file name, we can safely concatenate them
        // into 1 string, adding spaces where the command line has split it
        StringBuilder fileString = new StringBuilder();
        for (String s : args) {
            fileString.append(s);
            fileString.append(" ");
        }
        try {
            // reading the file
            File filePath = new File(fileString.toString());
            Scanner reader = new Scanner(filePath);
            StringBuilder data = new StringBuilder();
            // moves the file into a string
            while (reader.hasNextLine()) {
                data.append(reader.nextLine());
                data.append(" ");
            }
            reader.close();
            // Creating a container from a static lexer method
            Pair<List<Token>, List<String>> container = Lexer.lexer(data.toString().trim().replaceAll(" +", " "));
            // creates a new state
            ProgramHandler.ProgramState state = new ProgramHandler.ProgramState();
            // creates a new main program from the parser
            ProgramHandler.Program program = Parser.parse(container);
            // starts the programs running
            program.run(state);
            // prints all variables and values
            for (Map.Entry<String, Integer> entry : state.varLookup.entrySet()) {
                System.out.println("Variable: " + entry.getKey() + ", Value: " + entry.getValue());
            }
        }
        catch (FileNotFoundException e){
            System.out.println("File can't be found.");
             e.printStackTrace();
            // System.exit(1);
        }
    }
}