1 files changed, 24 insertions, 0 deletions
diff --git a/common.go b/common.go
index e6173b0..310da86 100644
--- a/common.go
+++ b/common.go
@@ -139,3 +139,27 @@ func setTime(m *Message, param string, t time.Time) {
 		m.SetParam(param, t.UTC().Format(time.RFC3339))
 	}
 }
+
+func getSelect(m *Message, param string) (string, string, error) {
+	s := m.Param(param)
+	if s == "" {
+		return "", "", nil
+	}
+	ss := strings.SplitN(s, ":", 2)
+	if len(ss) != 2 || ss[0] == "" {
+		return "", "", ErrorInvalid{"invalid parameter: " + param + " is not a valid selector"}
+	}
+	return ss[0], ss[1], nil
+}
+
+func setSelect(m *Message, param string, selector, query string) error {
+	if strings.ContainsRune(selector, ':') {
+		return ErrorInvalid{"invalid parameter: " + param + " is not a valid selector name"}
+	}
+	if selector == "" {
+		m.SetParam(param, "")
+	} else {
+		m.SetParam(param, selector+":"+query)
+	}
+	return nil
+}