can parse TagCompound and TagString and TagFloat

nbt/typeinfo.go

@@ -5,18 +5,35 @@ import (
 )
 
 type typeInfo struct {
+	tagName     string
+	nameToIndex map[string]int
 }
 
-func getTypeInfo(typ reflect.Type) (*typeInfo, error) {
+func getTypeInfo(typ reflect.Type) *typeInfo {
 	tinfo := new(typeInfo)
+	tinfo.nameToIndex = make(map[string]int)
 	if typ.Kind() == reflect.Struct {
 		n := typ.NumField()
 		for i := 0; i < n; i++ {
 			f := typ.Field(i)
-			if (f.PkgPath != "" && !f.Anonymous) || f.Tag.Get("nbt") == "-" {
+			tag := f.Tag.Get("nbt")
+			if (f.PkgPath != "" && !f.Anonymous) || tag == "-" {
 				continue // Private field
 			}
+
+			tinfo.nameToIndex[tag] = i
+			if _, ok := tinfo.nameToIndex[f.Name]; !ok {
+				tinfo.nameToIndex[f.Name] = i
+			}
 		}
 	}
-	return tinfo, nil
+	return tinfo
+}
+
+func (t *typeInfo) findIndexByName(name string) int {
+	i, ok := t.nameToIndex[name]
+	if !ok {
+		return -1
+	}
+	return i
 }