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record.go
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record.go
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package idl
import (
"bytes"
"fmt"
"math/big"
"reflect"
"sort"
"strings"
"github.com/aviate-labs/leb128"
)
func StructToMap(value any) (map[string]any, error) {
v := reflect.ValueOf(value)
switch v.Kind() {
case reflect.Struct:
m := make(map[string]any)
for i := 0; i < v.NumField(); i++ {
field := v.Type().Field(i)
if !field.IsExported() {
continue
}
tag := ParseTags(field)
m[tag.Name] = v.Field(i).Interface()
}
return m, nil
default:
return nil, fmt.Errorf("invalid value kind: %s", v.Kind())
}
}
type RecordType struct {
Fields []FieldType
}
func NewRecordType(fields map[string]Type) *RecordType {
var rec RecordType
for k, v := range fields {
rec.Fields = append(rec.Fields, FieldType{
Name: k,
Type: v,
})
}
sort.Slice(rec.Fields, func(i, j int) bool {
return Hash(rec.Fields[i].Name).Cmp(Hash(rec.Fields[j].Name)) < 0
})
return &rec
}
func (record RecordType) AddTypeDefinition(tdt *TypeDefinitionTable) error {
for _, f := range record.Fields {
if err := f.Type.AddTypeDefinition(tdt); err != nil {
return err
}
}
id, err := leb128.EncodeSigned(big.NewInt(recType))
if err != nil {
return err
}
l, err := leb128.EncodeUnsigned(big.NewInt(int64(len(record.Fields))))
if err != nil {
return err
}
var vs []byte
for _, f := range record.Fields {
l, err := leb128.EncodeUnsigned(Hash(f.Name))
if err != nil {
return nil
}
t, err := f.Type.EncodeType(tdt)
if err != nil {
return nil
}
vs = append(vs, concat(l, t)...)
}
tdt.Add(record, concat(id, l, vs))
return nil
}
func (record RecordType) Decode(r_ *bytes.Reader) (any, error) {
rec := make(map[string]any)
for _, f := range record.Fields {
v, err := f.Type.Decode(r_)
if err != nil {
return nil, err
}
rec[f.Name] = v
}
if len(rec) == 0 {
return nil, nil
}
return rec, nil
}
func (record RecordType) EncodeType(tdt *TypeDefinitionTable) ([]byte, error) {
idx, ok := tdt.Indexes[record.String()]
if !ok {
return nil, fmt.Errorf("missing type index for: %s", record)
}
return leb128.EncodeSigned(big.NewInt(int64(idx)))
}
func (record RecordType) EncodeValue(v any) ([]byte, error) {
if v == nil {
return nil, nil
}
fs, ok := v.(map[string]any)
if !ok {
var err error
if fs, err = StructToMap(v); err != nil {
return nil, NewEncodeValueError(v, recType)
}
}
var vs_ []any
for _, f := range record.Fields {
vs_ = append(vs_, fs[f.Name])
}
var vs []byte
for i, f := range record.Fields {
v_, err := f.Type.EncodeValue(vs_[i])
if err != nil {
return nil, err
}
vs = append(vs, v_...)
}
return vs, nil
}
func (record RecordType) String() string {
var s []string
for _, f := range record.Fields {
s = append(s, fmt.Sprintf("%s:%s", f.Name, f.Type.String()))
}
return fmt.Sprintf("record {%s}", strings.Join(s, "; "))
}
func (record RecordType) UnmarshalGo(raw any, _v any) error {
if raw == nil && record.Fields == nil {
return nil // Empty record.
}
m := make(map[string]any)
switch rv := reflect.ValueOf(raw); rv.Kind() {
case reflect.Map:
for _, k := range rv.MapKeys() {
m[k.String()] = rv.MapIndex(k).Interface()
}
case reflect.Struct:
for i := 0; i < rv.NumField(); i++ {
f := rv.Type().Field(i)
tag := ParseTags(f)
m[tag.Name] = rv.Field(i).Interface()
}
default:
return NewUnmarshalGoError(raw, _v)
}
if v, ok := _v.(*map[string]any); ok {
return record.unmarshalMap(m, v)
}
v, ok := checkIsPtr(_v)
if !ok {
return NewUnmarshalGoError(raw, _v)
}
if v.Kind() != reflect.Struct {
return NewUnmarshalGoError(raw, _v)
}
return record.unmarshalStruct(m, v)
}
func (record RecordType) unmarshalMap(raw map[string]any, _v *map[string]any) error {
m := make(map[string]any)
for _, f := range record.Fields {
v, err := EmptyOf(f.Type)
if err != nil {
return err
}
r := reflect.New(reflect.ValueOf(v).Type()).Elem()
if err := f.Type.UnmarshalGo(raw[f.Name], r.Addr().Interface()); err != nil {
return err
}
m[f.Name] = r.Interface()
}
*_v = m
return nil
}
func (record RecordType) unmarshalStruct(raw map[string]any, _v reflect.Value) error {
findField := func(name string) (reflect.Value, bool) {
name = lowerFirstCharacter(name)
for i := 0; i < _v.NumField(); i++ {
f := _v.Type().Field(i)
tag := ParseTags(f)
if tag.Name == name || HashString(tag.Name) == name {
return _v.Field(i), true
}
}
return reflect.Value{}, false
}
for _, f := range record.Fields {
v, ok := findField(f.Name)
if !ok {
return NewUnmarshalGoError(raw, _v.Interface())
}
v = v.Addr()
if v.IsNil() {
// Set to a new value if the field is nil.
if _, ok := f.Type.(*NullType); !ok {
v.Set(reflect.New(v.Type().Elem()))
}
}
if err := f.Type.UnmarshalGo(raw[f.Name], v.Interface()); err != nil {
return err
}
}
return nil
}