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|
package plist
import (
"encoding"
"reflect"
"time"
)
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
}
var (
textMarshalerType = reflect.TypeOf((*encoding.TextMarshaler)(nil)).Elem()
timeType = reflect.TypeOf((*time.Time)(nil)).Elem()
)
func (p *Encoder) marshalTextInterface(marshalable encoding.TextMarshaler) *plistValue {
s, err := marshalable.MarshalText()
if err != nil {
panic(err)
}
return &plistValue{String, string(s)}
}
func (p *Encoder) marshalStruct(typ reflect.Type, val reflect.Value) *plistValue {
tinfo, _ := getTypeInfo(typ)
dict := &dictionary{
m: make(map[string]*plistValue, len(tinfo.fields)),
}
for _, finfo := range tinfo.fields {
value := finfo.value(val)
if !value.IsValid() || finfo.omitEmpty && isEmptyValue(value) {
continue
}
dict.m[finfo.name] = p.marshal(value)
}
return &plistValue{Dictionary, dict}
}
func (p *Encoder) marshalTime(val reflect.Value) *plistValue {
time := val.Interface().(time.Time)
return &plistValue{Date, time}
}
func (p *Encoder) marshal(val reflect.Value) *plistValue {
if !val.IsValid() {
return nil
}
// time.Time implements TextMarshaler, but we need to store it in RFC3339
if val.Type() == timeType {
return p.marshalTime(val)
}
if val.Kind() == reflect.Ptr || (val.Kind() == reflect.Interface && val.NumMethod() == 0) {
ival := val.Elem()
if ival.IsValid() && ival.Type() == timeType {
return p.marshalTime(ival)
}
}
// Check for text marshaler.
if val.CanInterface() && val.Type().Implements(textMarshalerType) {
return p.marshalTextInterface(val.Interface().(encoding.TextMarshaler))
}
if val.CanAddr() {
pv := val.Addr()
if pv.CanInterface() && pv.Type().Implements(textMarshalerType) {
return p.marshalTextInterface(pv.Interface().(encoding.TextMarshaler))
}
}
// Descend into pointers or interfaces
if val.Kind() == reflect.Ptr || (val.Kind() == reflect.Interface && val.NumMethod() == 0) {
val = val.Elem()
}
// We got this far and still may have an invalid anything or nil ptr/interface
if !val.IsValid() || ((val.Kind() == reflect.Ptr || val.Kind() == reflect.Interface) && val.IsNil()) {
return nil
}
typ := val.Type()
if val.Kind() == reflect.Struct {
return p.marshalStruct(typ, val)
}
switch val.Kind() {
case reflect.String:
return &plistValue{String, val.String()}
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return &plistValue{Integer, signedInt{uint64(val.Int()), true}}
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
return &plistValue{Integer, signedInt{uint64(val.Uint()), false}}
case reflect.Float32, reflect.Float64:
return &plistValue{Real, sizedFloat{val.Float(), val.Type().Bits()}}
case reflect.Bool:
return &plistValue{Boolean, val.Bool()}
case reflect.Slice, reflect.Array:
if typ.Elem().Kind() == reflect.Uint8 {
bytes := []byte(nil)
if val.CanAddr() {
bytes = val.Bytes()
} else {
bytes = make([]byte, val.Len())
reflect.Copy(reflect.ValueOf(bytes), val)
}
return &plistValue{Data, bytes}
} else {
subvalues := make([]*plistValue, val.Len())
for idx, length := 0, val.Len(); idx < length; idx++ {
if subpval := p.marshal(val.Index(idx)); subpval != nil {
subvalues[idx] = subpval
}
}
return &plistValue{Array, subvalues}
}
case reflect.Map:
if typ.Key().Kind() != reflect.String {
panic(&unknownTypeError{typ})
}
l := val.Len()
dict := &dictionary{
m: make(map[string]*plistValue, l),
}
for _, keyv := range val.MapKeys() {
if subpval := p.marshal(val.MapIndex(keyv)); subpval != nil {
dict.m[keyv.String()] = subpval
}
}
return &plistValue{Dictionary, dict}
default:
panic(&unknownTypeError{typ})
}
return nil
}
|
