Add geosite protocol

common/geosite/rule.go

@@ -0,0 +1,62 @@
+package geosite
+
+import "github.com/sagernet/sing-box/option"
+
+type ItemType = uint8
+
+const (
+	RuleTypeDomain ItemType = iota
+	RuleTypeDomainSuffix
+	RuleTypeDomainKeyword
+	RuleTypeDomainRegex
+)
+
+type Item struct {
+	Type  ItemType
+	Value string
+}
+
+func Compile(code []Item) option.DefaultRule {
+	var domainLength int
+	var domainSuffixLength int
+	var domainKeywordLength int
+	var domainRegexLength int
+	for _, item := range code {
+		switch item.Type {
+		case RuleTypeDomain:
+			domainLength++
+		case RuleTypeDomainSuffix:
+			domainSuffixLength++
+		case RuleTypeDomainKeyword:
+			domainKeywordLength++
+		case RuleTypeDomainRegex:
+			domainRegexLength++
+		}
+	}
+	var codeRule option.DefaultRule
+	if domainLength > 0 {
+		codeRule.Domain = make([]string, 0, domainLength)
+	}
+	if domainSuffixLength > 0 {
+		codeRule.DomainSuffix = make([]string, 0, domainSuffixLength)
+	}
+	if domainKeywordLength > 0 {
+		codeRule.DomainKeyword = make([]string, 0, domainKeywordLength)
+	}
+	if domainRegexLength > 0 {
+		codeRule.DomainRegex = make([]string, 0, domainRegexLength)
+	}
+	for _, item := range code {
+		switch item.Type {
+		case RuleTypeDomain:
+			codeRule.Domain = append(codeRule.Domain, item.Value)
+		case RuleTypeDomainSuffix:
+			codeRule.DomainSuffix = append(codeRule.DomainSuffix, item.Value)
+		case RuleTypeDomainKeyword:
+			codeRule.DomainKeyword = append(codeRule.DomainKeyword, item.Value)
+		case RuleTypeDomainRegex:
+			codeRule.DomainRegex = append(codeRule.DomainRegex, item.Value)
+		}
+	}
+	return codeRule
+}