Fully remove dead code

Signed-off-by: John Howard <howardjohn@google.com>

v2/jsonpatch.go

@@ -214,22 +214,18 @@ func handleValues(av, bv interface{}, p string, patch []Operation) ([]Operation,
 		}
 	case []interface{}:
 		bt := bv.([]interface{})
-		if false && isSimpleArray(at) && isSimpleArray(bt) {
-			patch = append(patch, compareEditDistance(at, bt, p)...)
-		} else {
-			n := min(len(at), len(bt))
-			for i := len(at) - 1; i >= n; i-- {
-				patch = append(patch, NewOperation("remove", makePath(p, i), nil))
-			}
-			for i := n; i < len(bt); i++ {
-				patch = append(patch, NewOperation("add", makePath(p, i), bt[i]))
-			}
-			for i := 0; i < n; i++ {
-				var err error
-				patch, err = handleValues(at[i], bt[i], makePath(p, i), patch)
-				if err != nil {
-					return nil, err
-				}
+		n := min(len(at), len(bt))
+		for i := len(at) - 1; i >= n; i-- {
+			patch = append(patch, NewOperation("remove", makePath(p, i), nil))
+		}
+		for i := n; i < len(bt); i++ {
+			patch = append(patch, NewOperation("add", makePath(p, i), bt[i]))
+		}
+		for i := 0; i < n; i++ {
+			var err error
+			patch, err = handleValues(at[i], bt[i], makePath(p, i), patch)
+			if err != nil {
+				return nil, err
 			}
 		}
 	default:
@@ -238,100 +234,9 @@ func handleValues(av, bv interface{}, p string, patch []Operation) ([]Operation,
 	return patch, nil
 }
 
-func isBasicType(a interface{}) bool {
-	switch a.(type) {
-	case string, float64, bool:
-	default:
-		return false
-	}
-	return true
-}
-
-func isSimpleArray(a []interface{}) bool {
-	for i := range a {
-		switch a[i].(type) {
-		case string, float64, bool:
-		default:
-			val := reflect.ValueOf(a[i])
-			if val.Kind() == reflect.Map {
-				for _, k := range val.MapKeys() {
-					av := val.MapIndex(k)
-					if av.Kind() == reflect.Ptr || av.Kind() == reflect.Interface {
-						if av.IsNil() {
-							continue
-						}
-						av = av.Elem()
-					}
-					if av.Kind() != reflect.String && av.Kind() != reflect.Float64 && av.Kind() != reflect.Bool {
-						return false
-					}
-				}
-				return true
-			}
-			return false
-		}
-	}
-	return true
-}
-
-// https://en.wikipedia.org/wiki/Wagner%E2%80%93Fischer_algorithm
-// Adapted from https://github.com/texttheater/golang-levenshtein
-func compareEditDistance(s, t []interface{}, p string) []Operation {
-	m := len(s)
-	n := len(t)
-
-	d := make([][]int, m+1)
-	for i := 0; i <= m; i++ {
-		d[i] = make([]int, n+1)
-		d[i][0] = i
-	}
-	for j := 0; j <= n; j++ {
-		d[0][j] = j
-	}
-
-	for j := 1; j <= n; j++ {
-		for i := 1; i <= m; i++ {
-			if reflect.DeepEqual(s[i-1], t[j-1]) {
-				d[i][j] = d[i-1][j-1] // no op required
-			} else {
-				del := d[i-1][j] + 1
-				add := d[i][j-1] + 1
-				rep := d[i-1][j-1] + 1
-				d[i][j] = min(rep, min(add, del))
-			}
-		}
-	}
-
-	return backtrace(s, t, p, m, n, d)
-}
-
 func min(x int, y int) int {
 	if y < x {
 		return y
 	}
 	return x
 }
-
-func backtrace(s, t []interface{}, p string, i int, j int, matrix [][]int) []Operation {
-	if i > 0 && matrix[i-1][j]+1 == matrix[i][j] {
-		op := NewOperation("remove", makePath(p, i-1), nil)
-		return append([]Operation{op}, backtrace(s, t, p, i-1, j, matrix)...)
-	}
-	if j > 0 && matrix[i][j-1]+1 == matrix[i][j] {
-		op := NewOperation("add", makePath(p, i), t[j-1])
-		return append([]Operation{op}, backtrace(s, t, p, i, j-1, matrix)...)
-	}
-	if i > 0 && j > 0 && matrix[i-1][j-1]+1 == matrix[i][j] {
-		if isBasicType(s[0]) {
-			op := NewOperation("replace", makePath(p, i-1), t[j-1])
-			return append([]Operation{op}, backtrace(s, t, p, i-1, j-1, matrix)...)
-		}
-
-		p2, _ := handleValues(s[i-1], t[j-1], makePath(p, i-1), []Operation{})
-		return append(p2, backtrace(s, t, p, i-1, j-1, matrix)...)
-	}
-	if i > 0 && j > 0 && matrix[i-1][j-1] == matrix[i][j] {
-		return backtrace(s, t, p, i-1, j-1, matrix)
-	}
-	return []Operation{}
-}