Refactor rules

route/rule_item_network.go

@@ -0,0 +1,42 @@
+package route
+
+import (
+	"strings"
+
+	"github.com/sagernet/sing-box/adapter"
+	F "github.com/sagernet/sing/common/format"
+)
+
+var _ RuleItem = (*NetworkItem)(nil)
+
+type NetworkItem struct {
+	networks   []string
+	networkMap map[string]bool
+}
+
+func NewNetworkItem(networks []string) *NetworkItem {
+	networkMap := make(map[string]bool)
+	for _, network := range networks {
+		networkMap[network] = true
+	}
+	return &NetworkItem{
+		networks:   networks,
+		networkMap: networkMap,
+	}
+}
+
+func (r *NetworkItem) Match(metadata *adapter.InboundContext) bool {
+	return r.networkMap[metadata.Network]
+}
+
+func (r *NetworkItem) String() string {
+	description := "network="
+
+	pLen := len(r.networks)
+	if pLen == 1 {
+		description += F.ToString(r.networks[0])
+	} else {
+		description += "[" + strings.Join(F.MapToString(r.networks), " ") + "]"
+	}
+	return description
+}