xgbgen: make request function signatures shorter

nexgb/xgbgen/go_request_reply.go

@@ -247,9 +247,23 @@ func (r *Request) ParamNames() string {
 
 func (r *Request) ParamNameTypes() string {
 	nameTypes := make([]string, 0, len(r.Fields))
+
+	chunk := make([]string, 0)
+	chunkType := ""
+	flushChunk := func() {
+		if len(chunk) > 0 {
+			nameTypes = append(nameTypes, chunk[:len(chunk)-1]...)
+			nameTypes = append(nameTypes,
+				fmt.Sprintf("%s %s", chunk[len(chunk)-1], chunkType))
+		}
+		chunk = nil
+		chunkType = ""
+	}
+
 	for _, field := range r.Fields {
 		switch f := field.(type) {
 		case *ValueField:
+			flushChunk()
 			nameTypes = append(nameTypes,
 				fmt.Sprintf("%s %s", f.MaskName, f.MaskType.SrcName()))
 			nameTypes = append(nameTypes,
@@ -261,9 +275,14 @@ func (r *Request) ParamNameTypes() string {
 		case *RequiredStartAlign:
 			continue
 		default:
-			nameTypes = append(nameTypes,
+			curType := field.SrcType()
-				fmt.Sprintf("%s %s", field.SrcName(), field.SrcType()))
+			if curType != chunkType {
+				flushChunk()
+			}
+			chunk = append(chunk, field.SrcName())
+			chunkType = curType
 		}
 	}
+	flushChunk()
 	return strings.Join(nameTypes, ", ")
 }