Add type Entity

internal/entity/entity.go

@@ -0,0 +1,56 @@
+package entity
+
+import (
+	"sort"
+	"strings"
+)
+
+type EntityType uint
+
+const (
+	TypePlain = iota
+	TypeIPv4
+	TypeIPv6
+	TypeDomain
+)
+
+type Entity struct {
+	Index uint
+	Length uint
+	Type EntityType
+
+	Text string
+	Info string
+}
+
+func (e Entity) ParseInfo() error {
+	return nil
+}
+
+type Entities []*Entity
+
+func (es Entities) Len() int {
+	return len(es)
+}
+
+func (es Entities) Less(i, j int) bool {
+	return es[i].Index < es[j].Index
+}
+
+func (es Entities) Swap(i, j int) {
+	es[i],es[j] = es[j],es[i]
+}
+
+func (es Entities) String() string {
+	sort.Sort(es)
+
+	var result strings.Builder
+	for _, entity := range es {
+		result.WriteString(entity.Text)
+		if entity.Type!=TypePlain && len(entity.Info)>0 {
+			result.WriteString("[" + entity.Info + "] ")
+		}
+	}
+
+	return result.String()
+}

internal/entity/parse.go

@@ -0,0 +1,10 @@
+package entity
+
+// ParseLine parse a line into entities
+func ParseLine(line string) Entities {
+	entities := make(Entities, 0)
+
+	// TODO: parse a line into entities
+
+	return entities
+}