Application.java

package main;

import Exceptions.LexerException;
import Exceptions.ParserException;

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.LinkedList;
import java.util.List;

public class Application {
    public static void main(String[] args) {
        //A list that will contain a String for each line of the "expressions.txt" file
        List<String> expressions = new LinkedList<>();
        //Reads the file "expressions.txt" and adds its values to the list expressions
        BufferedReader reader;
        String datapath = "expressions.txt";
        try {
            System.out.println("Reading the file...\n");
            reader = new BufferedReader(new FileReader(datapath));
            String currentLine = reader.readLine();
            while(currentLine !=null) {
                expressions.add(currentLine);
                currentLine = reader.readLine();
            }
            reader.close();
        }
        catch(IOException e) {
            e.printStackTrace();
        }

        //Iterate through every String
        for (String expressionString: expressions) {
            System.out.println("Expression: " + expressionString);
            //Usage of the lexer, parser & evaluator
            try {
                //Create a list of tokens with the lexer
                List<Lexer.Token> tokens = Lexer.lex(expressionString);
                System.out.println("Lexer created tokens:");
                //prints out each token to the console
                for(Lexer.Token token: tokens) {
                    System.out.println(token.toString());
                }
                //Parse all tokens with the parser and saves the result into the variable 'ast'
                Parser parser = new Parser();
                Parser.Expression ast = parser.parse(tokens);
                //Prints the ast out with an ASTPrinter
                //the result can later be used to show the ast in a function plotter
                ASTPrinter printer = new ASTPrinter();
                System.out.println("Printing: '" + printer.visit(ast) + "'");
                System.out.println();
            }
            catch (Exception e) {
                e.printStackTrace();
            }

        }

        /*
                Evaluator evaluator = new Evaluator();
                String s = printer.visit(exp);
                System.out.println("Evaluating: '" + evaluator.visit(exp) + "'");
                SwingFunctionPlotter.plotFunction(s);
        }*/
    }
}