Xray-core: Refactor geodata (#5814)

https://github.com/XTLS/Xray-core/issues/4422#issuecomment-3533007890

Breaking changes https://github.com/XTLS/Xray-core/pull/5569

Reverts https://github.com/XTLS/Xray-core/pull/5505

Closes https://github.com/XTLS/Xray-core/pull/643

common/geodata/strmatcher/indexmatcher_linear.go

@@ -0,0 +1,96 @@
+package strmatcher
+
+// LinearIndexMatcher is an implementation of IndexMatcher.
+type LinearIndexMatcher struct {
+	count  uint32
+	full   *FullMatcherGroup
+	domain *DomainMatcherGroup
+	substr *SubstrMatcherGroup
+	regex  *SimpleMatcherGroup
+}
+
+func NewLinearIndexMatcher() *LinearIndexMatcher {
+	return new(LinearIndexMatcher)
+}
+
+// Add implements IndexMatcher.Add.
+func (g *LinearIndexMatcher) Add(matcher Matcher) uint32 {
+	g.count++
+	index := g.count
+
+	switch matcher := matcher.(type) {
+	case FullMatcher:
+		if g.full == nil {
+			g.full = NewFullMatcherGroup()
+		}
+		g.full.AddFullMatcher(matcher, index)
+	case DomainMatcher:
+		if g.domain == nil {
+			g.domain = NewDomainMatcherGroup()
+		}
+		g.domain.AddDomainMatcher(matcher, index)
+	case SubstrMatcher:
+		if g.substr == nil {
+			g.substr = new(SubstrMatcherGroup)
+		}
+		g.substr.AddSubstrMatcher(matcher, index)
+	default:
+		if g.regex == nil {
+			g.regex = new(SimpleMatcherGroup)
+		}
+		g.regex.AddMatcher(matcher, index)
+	}
+
+	return index
+}
+
+// Build implements IndexMatcher.Build.
+func (*LinearIndexMatcher) Build() error {
+	return nil
+}
+
+// Match implements IndexMatcher.Match.
+func (g *LinearIndexMatcher) Match(input string) []uint32 {
+	// Allocate capacity to prevent matches escaping to heap
+	result := make([][]uint32, 0, 5)
+	if g.full != nil {
+		if matches := g.full.Match(input); len(matches) > 0 {
+			result = append(result, matches)
+		}
+	}
+	if g.domain != nil {
+		if matches := g.domain.Match(input); len(matches) > 0 {
+			result = append(result, matches)
+		}
+	}
+	if g.substr != nil {
+		if matches := g.substr.Match(input); len(matches) > 0 {
+			result = append(result, matches)
+		}
+	}
+	if g.regex != nil {
+		if matches := g.regex.Match(input); len(matches) > 0 {
+			result = append(result, matches)
+		}
+	}
+	return CompositeMatches(result)
+}
+
+// MatchAny implements IndexMatcher.MatchAny.
+func (g *LinearIndexMatcher) MatchAny(input string) bool {
+	if g.full != nil && g.full.MatchAny(input) {
+		return true
+	}
+	if g.domain != nil && g.domain.MatchAny(input) {
+		return true
+	}
+	if g.substr != nil && g.substr.MatchAny(input) {
+		return true
+	}
+	return g.regex != nil && g.regex.MatchAny(input)
+}
+
+// Size implements IndexMatcher.Size.
+func (g *LinearIndexMatcher) Size() uint32 {
+	return g.count
+}