Set array index as key for ForEach

See #248

gjson.go

@@ -229,17 +229,19 @@ func (t Result) ForEach(iterator func(key, value Result) bool) {
 		return
 	}
 	json := t.Raw
-	var keys bool
+	var obj bool
 	var i int
 	var key, value Result
 	for ; i < len(json); i++ {
 		if json[i] == '{' {
 			i++
 			key.Type = String
-			keys = true
+			obj = true
 			break
 		} else if json[i] == '[' {
 			i++
+			key.Type = Number
+			key.Num = -1
 			break
 		}
 		if json[i] > ' ' {
@@ -251,7 +253,7 @@ func (t Result) ForEach(iterator func(key, value Result) bool) {
 	var ok bool
 	var idx int
 	for ; i < len(json); i++ {
-		if keys {
+		if obj {
 			if json[i] != '"' {
 				continue
 			}
@@ -267,6 +269,8 @@ func (t Result) ForEach(iterator func(key, value Result) bool) {
 			}
 			key.Raw = str
 			key.Index = s + t.Index
+		} else {
+			key.Num += 1
 		}
 		for ; i < len(json); i++ {
 			if json[i] <= ' ' || json[i] == ',' || json[i] == ':' {

gjson_test.go

@@ -435,9 +435,9 @@ func TestBasic1(t *testing.T) {
 	mtok := get(basicJSON, `loggy.programmers`)
 	var count int
 	mtok.ForEach(func(key, value Result) bool {
-		if key.Exists() {
-			t.Fatalf("expected %v, got %v", false, key.Exists())
-		}
+		assert(t, key.Exists())
+		assert(t, key.String() == fmt.Sprint(count))
+		assert(t, key.Int() == int64(count))
 		count++
 		if count == 3 {
 			return false
@@ -2441,3 +2441,23 @@ func TestStaticJSON(t *testing.T) {
 		`[true,false,null,inf,nan,{"name":"andy","last":"Anderson"},["any","thing"]]`,
 	)
 }
+
+func TestArrayKeys(t *testing.T) {
+	N := 100
+	json := "["
+	for i := 0; i < N; i++ {
+		if i > 0 {
+			json += ","
+		}
+		json += fmt.Sprint(i)
+	}
+	json += "]"
+	var i int
+	Parse(json).ForEach(func(key, value Result) bool {
+		assert(t, key.String() == fmt.Sprint(i))
+		assert(t, key.Int() == int64(i))
+		i++
+		return true
+	})
+	assert(t, i == N)
+}