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types.go
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types.go
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package msgpack
import (
"reflect"
"sync"
)
var errorType = reflect.TypeOf((*error)(nil)).Elem()
var customEncoderType = reflect.TypeOf((*CustomEncoder)(nil)).Elem()
var customDecoderType = reflect.TypeOf((*CustomDecoder)(nil)).Elem()
var marshalerType = reflect.TypeOf((*Marshaler)(nil)).Elem()
var unmarshalerType = reflect.TypeOf((*Unmarshaler)(nil)).Elem()
type encoderFunc func(*Encoder, reflect.Value) error
type decoderFunc func(*Decoder, reflect.Value) error
var typEncMap = make(map[reflect.Type]encoderFunc)
var typDecMap = make(map[reflect.Type]decoderFunc)
// Register registers encoder and decoder functions for a type.
// In most cases you should prefer implementing CustomEncoder and
// CustomDecoder interfaces.
func Register(typ reflect.Type, enc encoderFunc, dec decoderFunc) {
if enc != nil {
typEncMap[typ] = enc
}
if dec != nil {
typDecMap[typ] = dec
}
}
//------------------------------------------------------------------------------
var structs = newStructCache()
type structCache struct {
l sync.RWMutex
m map[reflect.Type]*fields
}
func newStructCache() *structCache {
return &structCache{
m: make(map[reflect.Type]*fields),
}
}
func (m *structCache) Fields(typ reflect.Type) *fields {
m.l.RLock()
fs, ok := m.m[typ]
m.l.RUnlock()
if !ok {
m.l.Lock()
fs, ok = m.m[typ]
if !ok {
fs = getFields(typ)
m.m[typ] = fs
}
m.l.Unlock()
}
return fs
}
//------------------------------------------------------------------------------
type field struct {
name string
index []int
omitEmpty bool
encoder encoderFunc
decoder decoderFunc
}
func (f *field) value(strct reflect.Value) reflect.Value {
return strct.FieldByIndex(f.index)
}
func (f *field) Omit(strct reflect.Value) bool {
return f.omitEmpty && isEmptyValue(f.value(strct))
}
func (f *field) EncodeValue(e *Encoder, strct reflect.Value) error {
return f.encoder(e, f.value(strct))
}
func (f *field) DecodeValue(d *Decoder, strct reflect.Value) error {
return f.decoder(d, f.value(strct))
}
//------------------------------------------------------------------------------
type fields struct {
List []*field
Table map[string]*field
asArray bool
omitEmpty bool
}
func newFields(numField int) *fields {
return &fields{
List: make([]*field, 0, numField),
Table: make(map[string]*field, numField),
}
}
func (fs *fields) Len() int {
return len(fs.List)
}
func (fs *fields) Add(field *field) {
fs.List = append(fs.List, field)
fs.Table[field.name] = field
if field.omitEmpty {
fs.omitEmpty = field.omitEmpty
}
}
func (fs *fields) OmitEmpty(strct reflect.Value) []*field {
if !fs.omitEmpty {
return fs.List
}
fields := make([]*field, 0, fs.Len())
for _, f := range fs.List {
if !f.Omit(strct) {
fields = append(fields, f)
}
}
return fields
}
func getFields(typ reflect.Type) *fields {
numField := typ.NumField()
fs := newFields(numField)
var omitEmpty bool
for i := 0; i < numField; i++ {
f := typ.Field(i)
name, opt := parseTag(f.Tag.Get("msgpack"))
if name == "-" {
continue
}
if f.Name == "_msgpack" {
if opt.Contains("asArray") {
fs.asArray = true
}
if opt.Contains("omitempty") {
omitEmpty = true
}
}
if f.PkgPath != "" && !f.Anonymous {
continue
}
if opt.Contains("inline") {
inlineFields(fs, f)
continue
}
if name == "" {
name = f.Name
}
field := field{
name: name,
index: f.Index,
omitEmpty: omitEmpty || opt.Contains("omitempty"),
encoder: getEncoder(f.Type),
decoder: getDecoder(f.Type),
}
fs.Add(&field)
}
return fs
}
func inlineFields(fs *fields, f reflect.StructField) {
typ := f.Type
if typ.Kind() == reflect.Ptr {
typ = typ.Elem()
}
inlinedFields := getFields(typ).List
for _, field := range inlinedFields {
if _, ok := fs.Table[field.name]; ok {
// Don't overwrite shadowed fields.
continue
}
field.index = append(f.Index, field.index...)
fs.Add(field)
}
}
func isEmptyValue(v reflect.Value) bool {
switch v.Kind() {
case reflect.Array, reflect.Map, reflect.Slice, reflect.String:
return v.Len() == 0
case reflect.Bool:
return !v.Bool()
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return v.Int() == 0
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
return v.Uint() == 0
case reflect.Float32, reflect.Float64:
return v.Float() == 0
case reflect.Interface, reflect.Ptr:
return v.IsNil()
}
return false
}