added first parser implementation

.gitignore

@@ -1 +1,2 @@
 .idea/
+out/

src/lsystem/Main.java

@@ -1,5 +1,7 @@
 package lsystem;
 
+import lsystem.engine.parser.Parser;
+
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Scanner;
@@ -8,13 +10,22 @@ public class Main {
 
     public static void main(String[] args) {
         Scanner scanner = new Scanner(System.in);
-        System.out.println("Axiom: ");
-        String axiom = scanner.next();
-        System.out.println("Règles (laissez vide quand vous avez fini): ");
-        List<String> rules = new ArrayList<>();
-        while(rules.isEmpty() || !rules.get(rules.size() - 1).equals("")) {
-            rules.add(scanner.next());
+        Parser parser = null;
+        while(parser == null || parser.isCorrect()) {
+            if(parser != null)
+                System.out.println("Vos règles ou votre axiome ne sont pas correctement écrites, veuillez recommencer");
+            System.out.println("Axiome: ");
+            String axiom = scanner.next();
+            System.out.println("Règles: (\"finish\" quand vous avez fini): ");
+            List<String> rules = new ArrayList<>();
+            while(rules.isEmpty() || !rules.get(rules.size() - 1).equals("finish")) {
+                rules.add(scanner.next());
+            }
+            rules.remove(rules.size() - 1);
+            parser = new Parser(axiom, rules);
         }
+
+        scanner.close();
     }
 
 }

src/lsystem/engine/parser/Parser.java

@@ -0,0 +1,20 @@
+package lsystem.engine.parser;
+
+import java.util.List;
+
+public class Parser {
+
+    private final String axiom;
+    private final List<String> rules;
+
+    public Parser(String axiom, List<String> rules) {
+        this.axiom = axiom;
+        this.rules = rules;
+    }
+
+    public boolean isCorrect(){
+
+        return false;
+    }
+
+}