From ffb8d1e43cfdbddcc529efbc60ddd3470dbd9724 Mon Sep 17 00:00:00 2001
From: Dan Buch <daniel.buch@gmail.com>
Date: Sun, 9 Dec 2012 22:33:42 -0500
Subject: [PATCH] Implementing dead cell reproduction

---
 conway/go/conway_test.go  | 24 ++++++++++++++++++++
 conway/go/game_of_life.go | 46 +++++++++++++++++++++++++--------------
 2 files changed, 54 insertions(+), 16 deletions(-)

diff --git a/conway/go/conway_test.go b/conway/go/conway_test.go
index 6884353..8d5149e 100644
--- a/conway/go/conway_test.go
+++ b/conway/go/conway_test.go
@@ -18,6 +18,7 @@ func init() {
 	tsis.Set(1, 0, 1)
 	tsis.Set(1, 1, 1)
 	tsis.Set(2, 2, 1)
+	tsis.Set(3, 0, 1)
 	tsis.Set(3, 2, 1)
 }
 
@@ -89,6 +90,29 @@ func TestLiveCellWithMoreThanThreeLiveNeighborsDies(t *testing.T) {
 	}
 }
 
+func TestDeadCellWithExactlyThreeLiveNeighborsBecomesAlive(t *testing.T) {
+	game := NewGameOfLife(16, 16)
+	err := game.ImportState(TEST_SIMPLE_INITIAL_STATE)
+
+	if err != nil {
+		t.Error(err)
+		return
+	}
+
+	game.EvaluateGeneration()
+
+	value, err := game.State.Get(3, 1)
+	if err != nil {
+		t.Error(err)
+		return
+	}
+
+	if value != 1 {
+		t.Errorf("%v != 1", value)
+		return
+	}
+}
+
 func TestNewGameOfLifeHasCorrectDimensions(t *testing.T) {
 	game := NewGameOfLife(16, 16)
 	if game.State.Height() != 16 || game.State.Width() != 16 {
diff --git a/conway/go/game_of_life.go b/conway/go/game_of_life.go
index fd61971..ca41b91 100644
--- a/conway/go/game_of_life.go
+++ b/conway/go/game_of_life.go
@@ -123,29 +123,43 @@ func (game *GameOfLife) EvaluateGeneration() error {
 				return err
 			}
 
-			if score < 2 {
-				err = game.State.Deaden(x, y)
-				if err != nil {
-					return err
-				}
-				continue
-			}
-
 			curState, err := game.State.Get(x, y)
 			if err != nil {
 				return err
 			}
 
-			if curState == 1 && (score == 2 || score == 3) {
-				continue
-			}
+			if curState == 1 {
 
-			if curState == 1 && score > 3 {
-				err = game.State.Deaden(x, y)
-				if err != nil {
-					return err
+				if score < 2 {
+					err = game.State.Deaden(x, y)
+					if err != nil {
+						return err
+					}
+					continue
+				}
+
+				if score == 2 || score == 3 {
+					continue
+				}
+
+				if score > 3 {
+					err = game.State.Deaden(x, y)
+					if err != nil {
+						return err
+					}
+					continue
+				}
+			} else if curState == 0 {
+
+				if score == 3 {
+					err = game.State.Enliven(x, y)
+					if err != nil {
+						return err
+					}
+					continue
+				} else {
+					continue
 				}
-				continue
 			}
 		}
 	}