gtsocial-umbx

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reflect.go (1480B)

      1 package schema
      2 
      3 import (
      4 	"database/sql/driver"
      5 	"encoding/json"
      6 	"net"
      7 	"reflect"
      8 	"time"
      9 )
     10 
     11 var (
     12 	bytesType          = reflect.TypeOf((*[]byte)(nil)).Elem()
     13 	timePtrType        = reflect.TypeOf((*time.Time)(nil))
     14 	timeType           = timePtrType.Elem()
     15 	ipType             = reflect.TypeOf((*net.IP)(nil)).Elem()
     16 	ipNetType          = reflect.TypeOf((*net.IPNet)(nil)).Elem()
     17 	jsonRawMessageType = reflect.TypeOf((*json.RawMessage)(nil)).Elem()
     18 
     19 	driverValuerType  = reflect.TypeOf((*driver.Valuer)(nil)).Elem()
     20 	queryAppenderType = reflect.TypeOf((*QueryAppender)(nil)).Elem()
     21 	jsonMarshalerType = reflect.TypeOf((*json.Marshaler)(nil)).Elem()
     22 )
     23 
     24 func indirectType(t reflect.Type) reflect.Type {
     25 	if t.Kind() == reflect.Ptr {
     26 		t = t.Elem()
     27 	}
     28 	return t
     29 }
     30 
     31 func fieldByIndex(v reflect.Value, index []int) (_ reflect.Value, ok bool) {
     32 	if len(index) == 1 {
     33 		return v.Field(index[0]), true
     34 	}
     35 
     36 	for i, idx := range index {
     37 		if i > 0 {
     38 			if v.Kind() == reflect.Ptr {
     39 				if v.IsNil() {
     40 					return v, false
     41 				}
     42 				v = v.Elem()
     43 			}
     44 		}
     45 		v = v.Field(idx)
     46 	}
     47 	return v, true
     48 }
     49 
     50 func fieldByIndexAlloc(v reflect.Value, index []int) reflect.Value {
     51 	if len(index) == 1 {
     52 		return v.Field(index[0])
     53 	}
     54 
     55 	for i, idx := range index {
     56 		if i > 0 {
     57 			v = indirectNil(v)
     58 		}
     59 		v = v.Field(idx)
     60 	}
     61 	return v
     62 }
     63 
     64 func indirectNil(v reflect.Value) reflect.Value {
     65 	if v.Kind() == reflect.Ptr {
     66 		if v.IsNil() {
     67 			v.Set(reflect.New(v.Type().Elem()))
     68 		}
     69 		v = v.Elem()
     70 	}
     71 	return v
     72 }