Pulled out the wasVisited function from DFS to genral solver

solver/dfs.go

@@ -6,18 +6,14 @@ import (
 )
 
 type DFSSolver struct {
-	visited map[*maze.Node]bool
+	solver
 }
 
 func (s *DFSSolver) Solve(m *maze.Maze) *maze.SolvedMaze {
-	defer utils.Timer("Turn left algorithm", 2)()
+	defer utils.Timer("DFS algorithm", 2)()
 
+	s.initVisited(m)
 	current, end := m.Nodes[0], m.Nodes[len(m.Nodes)-1]
-	s.visited = make(map[*maze.Node]bool, len(m.Nodes))
-
-	for _, node := range m.Nodes {
-		s.visited[node] = false
-	}
 
 	stack := make([]*maze.Node, 0, len(m.Nodes))
 	stack = append(stack, current)
@@ -53,11 +49,3 @@ func (s *DFSSolver) Solve(m *maze.Maze) *maze.SolvedMaze {
 	}
 	return ret
 }
-
-func (s *DFSSolver) wasVisited(node *maze.Node) bool {
-	if node == nil {
-		return true
-	}
-	visited, _ := s.visited[node]
-	return visited
-}

solver/solver.go

@@ -9,22 +9,46 @@ type Solver interface {
 	Solve(*maze.Maze) *maze.SolvedMaze
 }
 
+type solver struct {
+	visited map[*maze.Node]bool
+}
+
 type SolverFactory struct {
 	Type *string
 }
 
 const (
-	_TURN_LEFT = "turn-left"
+	_DFS = "dfs"
+	_BFS = "bfs"
 )
 
 var TYPES = []string{
-	_TURN_LEFT,
+	_DFS,
+	_BFS,
 }
 
 func (f *SolverFactory) Get() Solver {
 	switch *f.Type {
-	case _TURN_LEFT:
+	case _DFS:
 		return &DFSSolver{}
+	case _BFS:
+		return &BFSSolver{}
 	}
 	panic(fmt.Sprintf("Unrecognized solver type %q", *f.Type))
 }
+
+func (s *solver) wasVisited(node *maze.Node) bool {
+	if node == nil {
+		return true
+	}
+	visited, _ := s.visited[node]
+	return visited
+}
+
+func (s *solver) initVisited(m *maze.Maze) {
+	s.visited = make(map[*maze.Node]bool, len(m.Nodes))
+
+	for _, node := range m.Nodes {
+		s.visited[node] = false
+	}
+}