ui/qt/qwhisper, whisper, xeth: polish topic filter, fix wildcards

whisper/filter.go

@@ -16,6 +16,66 @@ type Filter struct {
 	Fn     func(msg *Message) // Handler in case of a match
 }
 
+// NewFilterTopics creates a 2D topic array used by whisper.Filter from binary
+// data elements.
+func NewFilterTopics(data ...[][]byte) [][]Topic {
+	filter := make([][]Topic, len(data))
+	for i, condition := range data {
+		// Handle the special case of condition == [[]byte{}]
+		if len(condition) == 1 && len(condition[0]) == 0 {
+			filter[i] = []Topic{}
+			continue
+		}
+		// Otherwise flatten normally
+		filter[i] = NewTopics(condition...)
+	}
+	return filter
+}
+
+// NewFilterTopicsFlat creates a 2D topic array used by whisper.Filter from flat
+// binary data elements.
+func NewFilterTopicsFlat(data ...[]byte) [][]Topic {
+	filter := make([][]Topic, len(data))
+	for i, element := range data {
+		// Only add non-wildcard topics
+		filter[i] = make([]Topic, 0, 1)
+		if len(element) > 0 {
+			filter[i] = append(filter[i], NewTopic(element))
+		}
+	}
+	return filter
+}
+
+// NewFilterTopicsFromStrings creates a 2D topic array used by whisper.Filter
+// from textual data elements.
+func NewFilterTopicsFromStrings(data ...[]string) [][]Topic {
+	filter := make([][]Topic, len(data))
+	for i, condition := range data {
+		// Handle the special case of condition == [""]
+		if len(condition) == 1 && condition[0] == "" {
+			filter[i] = []Topic{}
+			continue
+		}
+		// Otherwise flatten normally
+		filter[i] = NewTopicsFromStrings(condition...)
+	}
+	return filter
+}
+
+// NewFilterTopicsFromStringsFlat creates a 2D topic array used by whisper.Filter from flat
+// binary data elements.
+func NewFilterTopicsFromStringsFlat(data ...string) [][]Topic {
+	filter := make([][]Topic, len(data))
+	for i, element := range data {
+		// Only add non-wildcard topics
+		filter[i] = make([]Topic, 0, 1)
+		if element != "" {
+			filter[i] = append(filter[i], NewTopicFromString(element))
+		}
+	}
+	return filter
+}
+
 // filterer is the internal, fully initialized filter ready to match inbound
 // messages to a variety of criteria.
 type filterer struct {