Add support for map datatype

Author: jeffreylovitz

client_test.go

@@ -216,6 +216,34 @@ func TestArray(t *testing.T) {
 	assert.Equal(t, b.GetProperty("array"), resB.GetProperty("array"), "Unexpected property value.")
 }
 
+func TestMap(t *testing.T) {
+	createGraph()
+
+	q := "RETURN {val_1: 5, val_2: 'str'}"
+	res, err := graph.Query(q)
+	if err != nil {
+		t.Error(err)
+	}
+	res.Next()
+	r := res.Record()
+	mapval := r.GetByIndex(0).(map[string]interface{})
+
+	expected := map[string]interface{}{"val_1": 5, "val_2": "str"}
+	assert.Equal(t, mapval, expected, "expecting a map literal")
+
+	q = "MATCH (a:Country) RETURN a { .name }"
+	res, err = graph.Query(q)
+	if err != nil {
+		t.Error(err)
+	}
+	res.Next()
+	r = res.Record()
+	mapval = r.GetByIndex(0).(map[string]interface{})
+
+	expected = map[string]interface{}{"name": "Japan"}
+	assert.Equal(t, mapval, expected, "expecting a map projection")
+}
+
 func TestPath(t *testing.T) {
 	createGraph()
 	q := "MATCH p = (:Person)-[:Visited]->(:Country) RETURN p"

query_result.go

@@ -44,6 +44,7 @@ const (
 	VALUE_EDGE
 	VALUE_NODE
 	VALUE_PATH
+	VALUE_MAP
 )
 
 type QueryResultHeader struct {
@@ -227,6 +228,18 @@ func (qr *QueryResult) parsePath(cell interface{}) Path {
 	return PathNew(nodes.([]interface{}), edges.([]interface{}))
 }
 
+func (qr *QueryResult) parseMap(cell interface{}) map[string]interface{} {
+	var raw_map = cell.([]interface{})
+	var mapLength = len(raw_map)
+	var parsed_map = make(map[string]interface{})
+	for i := 0; i < mapLength; i++ {
+		pair := raw_map[i].([]interface{})
+		key, _ := redis.String(pair[0], nil)
+		parsed_map[key] = qr.parseScalar(pair[1].([]interface{}))
+	}
+	return parsed_map
+}
+
 func (qr *QueryResult) parseScalar(cell []interface{}) interface{} {
 	t, _ := redis.Int(cell[0], nil)
 	v := cell[1]
@@ -259,6 +272,9 @@ func (qr *QueryResult) parseScalar(cell []interface{}) interface{} {
 	case VALUE_PATH:
 		s = qr.parsePath(v)
 
+	case VALUE_MAP:
+		s = qr.parseMap(v)
+
 	case VALUE_UNKNOWN:
 		panic("Unknown scalar type\n")
 	}