Add option --print to CLI

src/main/java/Main.java

@@ -3,6 +3,7 @@ import interpreter.InterpreterException;
 import parser.Parser;
 import parser.SyntaxException;
 import program.Program;
+import printer.ProgramPrinter;
 
 import java.io.IOException;
 import java.nio.charset.StandardCharsets;
@@ -14,12 +15,20 @@ public class Main {
     public static void main(String[] args) {
         if (args.length == 0) {
             System.err.println("No file given");
-        } else if (args.length > 1) {
-            System.err.println("Too many arguments");
         } else {
             try {
                 String code = readFile(args[0]);
-                run(code);
+                if (args.length == 2) {
+                  if ("--print".equals(args[1])) {
+                    print(code);
+                  } else {
+                    System.err.println("Invalid argument " + args[1]);
+                  }
+                } else if (args.length == 1) {
+                  run(code);
+                } else {
+                  System.err.println("Too many arguments");
+                }
             } catch (IOException e) {
                 e.printStackTrace();
             }
@@ -31,6 +40,17 @@ public class Main {
         return new String(encoded, StandardCharsets.UTF_8);
     }
 
+    private static void print(String code) {
+        try {
+            Parser parser = new Parser(code);
+            Program program = parser.parse();
+            ProgramPrinter printer = new ProgramPrinter();
+            System.out.println(printer.print(program));
+        } catch (SyntaxException se) {
+            System.err.println(se);
+        }
+    }
+
     private static void run(String code) {
         try {
             Parser parser = new Parser(code);