fix nested array access (#104)

Co-authored-by: Earncef Sequeira <earncef.sequeira@beamery.com>

accessors.go

@@ -116,9 +116,15 @@ func getKey(s string) (string, string) {
 func access(current interface{}, selector string, value interface{}, isSet bool) interface{} {
 	thisSel, nextSel := getKey(selector)
 
-	index := -1
-	if strings.Contains(thisSel, "[") {
+	indexes := []int{}
+	for strings.Contains(thisSel, "[") {
+		prevSel := thisSel
+		index := -1
 		index, thisSel = getIndex(thisSel)
+		indexes = append(indexes, index)
+		if prevSel == thisSel {
+			break
+		}
 	}
 
 	if curMap, ok := current.(Map); ok {
@@ -134,7 +140,7 @@ func access(current interface{}, selector string, value interface{}, isSet bool)
 		}
 
 		_, ok := curMSI[thisSel].(map[string]interface{})
-		if (curMSI[thisSel] == nil || !ok) && index == -1 && isSet {
+		if (curMSI[thisSel] == nil || !ok) && len(indexes) == 0 && isSet {
 			curMSI[thisSel] = map[string]interface{}{}
 		}
 
@@ -144,15 +150,23 @@ func access(current interface{}, selector string, value interface{}, isSet bool)
 	}
 
 	// do we need to access the item of an array?
-	if index > -1 {
-		if array, ok := interSlice(current); ok {
-			if index < len(array) {
-				current = array[index]
-			} else {
-				current = nil
+	if len(indexes) > 0 {
+		num := len(indexes)
+		for num > 0 {
+			num--
+			index := indexes[num]
+			indexes = indexes[:num]
+			if array, ok := interSlice(current); ok {
+				if index < len(array) {
+					current = array[index]
+				} else {
+					current = nil
+					break
+				}
 			}
 		}
 	}
+
 	if nextSel != "" {
 		current = access(current, nextSel, value, isSet)
 	}

accessors_test.go

@@ -218,3 +218,22 @@ func TestAccessorsSet(t *testing.T) {
 
 	assert.Equal(t, "Mat", m.Get("name").Data())
 }
+
+func TestAccessorsNested(t *testing.T) {
+	d := objx.MustFromJSON(`{"values":[["test", "test1"], ["test2", {"name":"Mat"}, {"names": ["Captain", "Mat"]}]]}`)
+
+	value := d.Get("values[0][0]").String()
+	assert.Equal(t, "test", value)
+
+	value = d.Get("values[0][1]").String()
+	assert.Equal(t, "test1", value)
+
+	value = d.Get("values[1][0]").String()
+	assert.Equal(t, "test2", value)
+
+	value = d.Get("values[1][1].name").String()
+	assert.Equal(t, "Mat", value)
+
+	value = d.Get("values[1][2].names[0]").String()
+	assert.Equal(t, "Captain", value)
+}