fixed lint errors in d2astar (#533)

* fixed lint errors in d2astar

* Update astar.go

d2common/d2astar/astar.go

@@ -76,15 +76,16 @@ func (nm nodeMap) get(p Pather) *node {
 		n.pather = p
 		nm[p] = n
 	}
+
 	return n
 }
 
 // Path calculates a short path and the distance between the two Pather nodes.
-//
 // If no path is found, found will be false and path will be the closest node to the target with a valid path.
 func Path(from, to Pather, maxCost float64) (path []Pather, distance float64, found bool) {
 	nm := nodeMapPool.Get().(nodeMap)
 	nq := priorityQueuePool.Get().(priorityQueue)
+
 	defer func() {
 		for k, v := range nm {
 			v.reset()
@@ -93,7 +94,9 @@ func Path(from, to Pather, maxCost float64) (path []Pather, distance float64, fo
 		}
 
 		nq = nq[0:0]
+
 		nodeMapPool.Put(nm)
+
 		priorityQueuePool.Put(nq)
 	}()
 
@@ -106,7 +109,9 @@ func Path(from, to Pather, maxCost float64) (path []Pather, distance float64, fo
 			// There's no path, fallback to closest.
 			break
 		}
+
 		current := heap.Pop(&nq).(*node)
+
 		current.open = false
 		current.closed = true
 

d2common/d2astar/doc.go

@@ -0,0 +1,2 @@
+// Package d2astar provides an a* pathing algorithm
+package d2astar

d2common/d2astar/goreland_example.go

@@ -15,18 +15,22 @@ package d2astar
 // The key differences between this example and the Tile world:
 // 1) There is no grid.  Trucks have arbitrary coordinates.
 // 2) Edges are not implied by the grid positions.  Instead edges are explicitly
-//    modelled as Tubes.
+//    modeled as Tubes.
 //
 // The key similarities between this example and the Tile world:
 // 1) They both use Manhattan distance as their heuristic
 // 2) Both implement Pather
 
-//Goreland represents a world of trucks and tubes.
+// Goreland represents a world of trucks and tubes.
 type Goreland struct {
 	//	trucks map[int]*Truck		// not needed really
 }
 
-//Tube is an edge. They connect Trucks, and have a cost.
+const (
+	_tenFuckingMillion = 10000000
+)
+
+// Tube is an edge. They connect Trucks, and have a cost.
 type Tube struct {
 	from *Truck
 	to   *Truck
@@ -47,39 +51,41 @@ type Truck struct {
 
 // PathNeighbors returns the neighbors of the Truck
 func (t *Truck) PathNeighbors() []Pather {
-
 	neighbors := []Pather{}
 
 	for _, tubeElement := range t.outTo {
 		neighbors = append(neighbors, Pather(tubeElement.to))
 	}
+
 	return neighbors
 }
 
 // PathNeighborCost returns the cost of the tube leading to Truck.
 func (t *Truck) PathNeighborCost(to Pather) float64 {
-
 	for _, tubeElement := range (t).outTo {
 		if Pather((tubeElement.to)) == to {
 			return tubeElement.Cost
 		}
 	}
-	return 10000000
+
+	return _tenFuckingMillion
 }
 
 // PathEstimatedCost uses Manhattan distance to estimate orthogonal distance
 // between non-adjacent nodes.
 func (t *Truck) PathEstimatedCost(to Pather) float64 {
-
 	toT := to.(*Truck)
 	absX := toT.X - t.X
+
 	if absX < 0 {
 		absX = -absX
 	}
+
 	absY := toT.Y - t.Y
 	if absY < 0 {
 		absY = -absY
 	}
+
 	r := float64(absX + absY)
 
 	return r
@@ -87,11 +93,12 @@ func (t *Truck) PathEstimatedCost(to Pather) float64 {
 
 // RenderPath renders a path on top of a Goreland world.
 func (w Goreland) RenderPath(path []Pather) string {
-
 	s := ""
+
 	for _, p := range path {
 		pT := p.(*Truck)
 		s = pT.label + " " + s
 	}
+
 	return s
 }

d2common/d2astar/goreland_test.go

@@ -5,15 +5,16 @@ import (
 	"testing"
 )
 
-func AddTruck(x int, y int, label string) *Truck {
+func addTruck(x, y int, label string) *Truck {
 	t1 := new(Truck)
 	t1.X = x
 	t1.Y = y
 	t1.label = label
+
 	return t1
 }
 
-func AddTube(t1, t2 *Truck, cost float64) *Tube {
+func addTube(t1, t2 *Truck, cost float64) *Tube {
 	tube1 := new(Tube)
 	tube1.Cost = cost
 	tube1.from = t1
@@ -49,17 +50,16 @@ func AddTube(t1, t2 *Truck, cost float64) *Tube {
 //    Solver should avoid the plugged tube.
 //    Expect solution Start,Middle,End  Total cost: 2.0
 
-func createGorelandGraphPathDiagonal(t *testing.T, diagonalCost float64, expectedDist float64) {
-
+func createGorelandGraphPathDiagonal(t *testing.T, diagonalCost, expectedDist float64) {
 	world := new(Goreland)
 
-	trStart := AddTruck(0, 0, "Start")
-	trMid := AddTruck(0, 1, "Middle")
-	trEnd := AddTruck(1, 1, "End")
+	trStart := addTruck(0, 0, "Start")
+	trMid := addTruck(0, 1, "Middle")
+	trEnd := addTruck(1, 1, "End")
 
-	AddTube(trStart, trEnd, diagonalCost)
-	AddTube(trStart, trMid, 1)
-	AddTube(trMid, trEnd, 1)
+	addTube(trStart, trEnd, diagonalCost)
+	addTube(trStart, trMid, 1)
+	addTube(trMid, trEnd, 1)
 
 	t.Logf("Goreland.  Diagonal cost: %v\n\n", diagonalCost)
 
@@ -70,9 +70,11 @@ func createGorelandGraphPathDiagonal(t *testing.T, diagonalCost float64, expecte
 	} else {
 		t.Logf("Resulting path\n%s", world.RenderPath(p))
 	}
+
 	if !found && expectedDist >= 0 {
 		t.Fatal("Could not find a path")
 	}
+
 	if found && dist != expectedDist {
 		t.Fatalf("Expected dist to be %v but got %v", expectedDist, dist)
 	}

d2common/d2astar/path_test.go

@@ -16,14 +16,17 @@ func testPath(worldInput string, t *testing.T, expectedDist float64) {
 	world := ParseWorld(worldInput)
 	t.Logf("Input world\n%s", world.RenderPath([]Pather{}))
 	p, dist, found := Path(world.From(), world.To(), math.MaxFloat64)
+
 	if !found {
 		t.Log("Could not find a path")
 	} else {
 		t.Logf("Resulting path\n%s", world.RenderPath(p))
 	}
+
 	if !found && expectedDist >= 0 {
 		t.Fatal("Could not find a path")
 	}
+
 	if found && dist != expectedDist {
 		t.Fatalf("Expected dist to be %v but got %v", expectedDist, dist)
 	}
@@ -126,6 +129,7 @@ F............................~.................................................
 ..............................................X....~.......MM......X.X.X.X.X.X.
 ...............................................X...~.......M.........X...X...XT
 `)
+
 	for i := 0; i < b.N; i++ {
 		Path(world.From(), world.To(), math.MaxFloat64)
 	}

d2common/d2astar/pather_test.go

@@ -29,7 +29,7 @@ const (
 )
 
 // KindRunes map tile kinds to output runes.
-var KindRunes = map[int]rune{
+var KindRunes = map[int]rune{ // nolint:gochecknoglobals // it's a test
 	KindPlain:    '.',
 	KindRiver:    '~',
 	KindMountain: 'M',
@@ -40,7 +40,7 @@ var KindRunes = map[int]rune{
 }
 
 // RuneKinds map input runes to tile kinds.
-var RuneKinds = map[rune]int{
+var RuneKinds = map[rune]int{ // nolint:gochecknoglobals // it's a test
 	'.': KindPlain,
 	'~': KindRiver,
 	'M': KindMountain,
@@ -50,7 +50,7 @@ var RuneKinds = map[rune]int{
 }
 
 // KindCosts map tile kinds to movement costs.
-var KindCosts = map[int]float64{
+var KindCosts = map[int]float64{ // nolint:gochecknoglobals // it's a test
 	KindPlain:    1.0,
 	KindFrom:     1.0,
 	KindTo:       1.0,
@@ -71,7 +71,8 @@ type Tile struct {
 // PathNeighbors returns the neighbors of the tile, excluding blockers and
 // tiles off the edge of the board.
 func (t *Tile) PathNeighbors() []Pather {
-	neighbors := []Pather{}
+	neighbors := make([]Pather, 0)
+
 	for _, offset := range [][]int{
 		{-1, 0},
 		{1, 0},
@@ -83,6 +84,7 @@ func (t *Tile) PathNeighbors() []Pather {
 			neighbors = append(neighbors, n)
 		}
 	}
+
 	return neighbors
 }
 
@@ -97,13 +99,16 @@ func (t *Tile) PathNeighborCost(to Pather) float64 {
 func (t *Tile) PathEstimatedCost(to Pather) float64 {
 	toT := to.(*Tile)
 	absX := toT.X - t.X
+
 	if absX < 0 {
 		absX = -absX
 	}
+
 	absY := toT.Y - t.Y
 	if absY < 0 {
 		absY = -absY
 	}
+
 	return float64(absX + absY)
 }
 
@@ -115,6 +120,7 @@ func (w World) Tile(x, y int) *Tile {
 	if w[x] == nil {
 		return nil
 	}
+
 	return w[x][y]
 }
 
@@ -123,6 +129,7 @@ func (w World) SetTile(t *Tile, x, y int) {
 	if w[x] == nil {
 		w[x] = map[int]*Tile{}
 	}
+
 	w[x][y] = t
 	t.X = x
 	t.Y = y
@@ -139,6 +146,7 @@ func (w World) FirstOfKind(kind int) *Tile {
 			}
 		}
 	}
+
 	return nil
 }
 
@@ -158,41 +166,50 @@ func (w World) RenderPath(path []Pather) string {
 	if width == 0 {
 		return ""
 	}
+
 	height := len(w[0])
 	pathLocs := map[string]bool{}
+
 	for _, p := range path {
 		pT := p.(*Tile)
 		pathLocs[fmt.Sprintf("%d,%d", pT.X, pT.Y)] = true
 	}
+
 	rows := make([]string, height)
+
 	for x := 0; x < width; x++ {
 		for y := 0; y < height; y++ {
 			t := w.Tile(x, y)
 			r := ' '
+
 			if pathLocs[fmt.Sprintf("%d,%d", x, y)] {
 				r = KindRunes[KindPath]
 			} else if t != nil {
 				r = KindRunes[t.Kind]
 			}
+
 			rows[y] += string(r)
 		}
 	}
+
 	return strings.Join(rows, "\n")
 }
 
 // ParseWorld parses a textual representation of a world into a world map.
 func ParseWorld(input string) World {
 	w := World{}
+
 	for y, row := range strings.Split(strings.TrimSpace(input), "\n") {
 		for x, raw := range row {
 			kind, ok := RuneKinds[raw]
+
 			if !ok {
 				kind = KindBlocker
 			}
-			w.SetTile(&Tile{
-				Kind: kind,
-			}, x, y)
+
+			w.SetTile(&Tile{Kind: kind}, x, y)
 		}
 	}
+
 	return w
 }

d2common/d2astar/priority_queue.go

@@ -31,5 +31,6 @@ func (pq *priorityQueue) Pop() interface{} {
 	no := old[n-1]
 	no.index = -1
 	*pq = old[0 : n-1]
+
 	return no
 }