Extract CellPattern and GameOfLife into own files

lib/src/Simulation.dart

@@ -2,6 +2,7 @@ import 'dart:html' as html;
 import 'dart:math' as math;
 
 import 'package:rules_of_living/src/Grid.dart';
+import 'package:rules_of_living/src/rules/GameOfLife.dart';
 import 'package:rules_of_living/src/rules/RuleSet.dart';
 
 enum CellPattern { SpaceShip, Blinker }

lib/src/rules/CellPattern.dart

@@ -0,0 +1,10 @@
+import 'package:collection/collection.dart';
+
+class CellPattern<Point> extends DelegatingList<Point> {
+  final String _name;
+  CellPattern(String name, List base)
+      : _name = name,
+        super(base);
+
+  String get name => _name;
+}

lib/src/rules/GameOfLife.dart

@@ -0,0 +1,38 @@
+import 'dart:math';
+
+import 'package:rules_of_living/src/rules/RuleSet.dart';
+import 'package:rules_of_living/src/rules/CellPattern.dart';
+
+class GameOfLife implements RuleSet {
+  int checkRange = 1;
+  List<CellPattern> patterns = <CellPattern>[
+    // Two blocks, offset
+    // ##
+    //   ##
+    CellPattern("Blinker", [
+      Point(0, 0),
+      Point(1, 0),
+      Point(0, 1),
+      Point(1, 1),
+      Point(2, 2),
+      Point(3, 2),
+      Point(2, 3),
+      Point(3, 3)
+    ]),
+    // A 'gliding' Spaceship
+    //   #
+    //    #
+    //  ###
+    CellPattern("SpaceShip", [
+      Point(1, 0),
+      Point(2, 1),
+      Point(2, 2),
+      Point(1, 2),
+      Point(0, 2),
+    ])
+  ];
+
+  bool checkSurvival(int neighbors) =>
+      neighbors == 2 || neighbors == 3 ? true : false;
+  bool checkBirth(int neighbors) => neighbors == 3 ? true : false;
+}

lib/src/rules/RuleSet.dart

@@ -1,54 +1,9 @@
-import 'dart:math';
-
-import 'package:collection/collection.dart';
+import 'package:rules_of_living/src/rules/CellPattern.dart';
 
 abstract class RuleSet {
   int checkRange;
-  List<Pattern> patterns;
+  List<CellPattern> patterns;
 
   bool checkSurvival(int neighbors);
   bool checkBirth(int neighbors);
 }
-
-class Pattern<Point> extends DelegatingList<Point> {
-  final String _name;
-  Pattern(String name, List base)
-      : _name = name,
-        super(base);
-
-  String get name => _name;
-}
-
-class GameOfLife implements RuleSet {
-  int checkRange = 1;
-  List<Pattern> patterns = [
-    // Two blocks, offset
-    // ##
-    //   ##
-    Pattern("Blinker", [
-      Point(0, 0),
-      Point(1, 0),
-      Point(0, 1),
-      Point(1, 1),
-      Point(2, 2),
-      Point(3, 2),
-      Point(2, 3),
-      Point(3, 3)
-    ]),
-    // A 'gliding' Spaceship
-    //   #
-    //    #
-    //  ###
-    Pattern("SpaceShip", [
-      Point(1, 0),
-      Point(2, 1),
-      Point(2, 2),
-      Point(1, 2),
-      Point(0, 2),
-    ])
-  ];
-
-  bool checkSurvival(int neighbors) =>
-      neighbors == 2 || neighbors == 3 ? true : false;
-  bool checkBirth(int neighbors) => neighbors == 3 ? true : false;
-}