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append_value.go
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append_value.go
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package types
import (
"database/sql/driver"
"encoding/json"
"net"
"reflect"
"strconv"
"time"
)
var driverValuerType = reflect.TypeOf((*driver.Valuer)(nil)).Elem()
var appenderType = reflect.TypeOf((*ValueAppender)(nil)).Elem()
type AppenderFunc func([]byte, reflect.Value, int) []byte
var valueAppenders []AppenderFunc
func init() {
valueAppenders = []AppenderFunc{
reflect.Bool: appendBoolValue,
reflect.Int: appendIntValue,
reflect.Int8: appendIntValue,
reflect.Int16: appendIntValue,
reflect.Int32: appendIntValue,
reflect.Int64: appendIntValue,
reflect.Uint: appendUintValue,
reflect.Uint8: appendUintValue,
reflect.Uint16: appendUintValue,
reflect.Uint32: appendUintValue,
reflect.Uint64: appendUintValue,
reflect.Uintptr: nil,
reflect.Float32: appendFloatValue,
reflect.Float64: appendFloatValue,
reflect.Complex64: nil,
reflect.Complex128: nil,
reflect.Array: nil,
reflect.Chan: nil,
reflect.Func: nil,
reflect.Interface: appendIfaceValue,
reflect.Map: appendJSONValue,
reflect.Ptr: nil,
reflect.Slice: appendJSONValue,
reflect.String: appendStringValue,
reflect.Struct: appendStructValue,
reflect.UnsafePointer: nil,
}
}
func Appender(typ reflect.Type) AppenderFunc {
return appender(typ, false)
}
func appender(typ reflect.Type, pgArray bool) AppenderFunc {
switch typ {
case timeType:
return appendTimeValue
case ipType:
return appendIPValue
case ipNetType:
return appendIPNetValue
}
if typ.Implements(appenderType) {
return appendAppenderValue
}
if typ.Implements(driverValuerType) {
return appendDriverValuerValue
}
kind := typ.Kind()
switch kind {
case reflect.Ptr:
return ptrAppenderFunc(typ)
case reflect.Slice:
if typ.Elem().Kind() == reflect.Uint8 {
return appendBytesValue
}
if pgArray {
return ArrayAppender(typ)
}
case reflect.Array:
if typ.Elem().Kind() == reflect.Uint8 {
return appendArrayBytesValue
}
}
return valueAppenders[kind]
}
func ptrAppenderFunc(typ reflect.Type) AppenderFunc {
appender := Appender(typ.Elem())
return func(b []byte, v reflect.Value, quote int) []byte {
if v.IsNil() {
return AppendNull(b, quote)
}
return appender(b, v.Elem(), quote)
}
}
func appendValue(b []byte, v reflect.Value, quote int) []byte {
if v.Kind() == reflect.Ptr {
if v.IsNil() {
return AppendNull(b, quote)
}
return appendValue(b, v.Elem(), quote)
}
appender := Appender(v.Type())
return appender(b, v, quote)
}
func appendIfaceValue(b []byte, v reflect.Value, quote int) []byte {
return Append(b, v.Interface(), quote)
}
func appendBoolValue(b []byte, v reflect.Value, _ int) []byte {
return appendBool(b, v.Bool())
}
func appendIntValue(b []byte, v reflect.Value, _ int) []byte {
return strconv.AppendInt(b, v.Int(), 10)
}
func appendUintValue(b []byte, v reflect.Value, _ int) []byte {
return strconv.AppendUint(b, v.Uint(), 10)
}
func appendFloatValue(b []byte, v reflect.Value, _ int) []byte {
return appendFloat(b, v.Float())
}
func appendBytesValue(b []byte, v reflect.Value, quote int) []byte {
return appendBytes(b, v.Bytes(), quote)
}
func appendArrayBytesValue(b []byte, v reflect.Value, quote int) []byte {
return appendBytes(b, v.Slice(0, v.Len()).Bytes(), quote)
}
func appendStringValue(b []byte, v reflect.Value, quote int) []byte {
return AppendString(b, v.String(), quote)
}
func appendStructValue(b []byte, v reflect.Value, quote int) []byte {
if v.Type() == timeType {
return appendTimeValue(b, v, quote)
}
return appendJSONValue(b, v, quote)
}
func appendJSONValue(b []byte, v reflect.Value, quote int) []byte {
bytes, err := json.Marshal(v.Interface())
if err != nil {
return AppendError(b, err)
}
return AppendJSONB(b, bytes, quote)
}
func appendTimeValue(b []byte, v reflect.Value, quote int) []byte {
tm := v.Interface().(time.Time)
return AppendTime(b, tm, quote)
}
func appendIPValue(b []byte, v reflect.Value, quote int) []byte {
ip := v.Interface().(net.IP)
return AppendString(b, ip.String(), quote)
}
func appendIPNetValue(b []byte, v reflect.Value, quote int) []byte {
ipnet := v.Interface().(net.IPNet)
return AppendString(b, ipnet.String(), quote)
}
func appendAppenderValue(b []byte, v reflect.Value, quote int) []byte {
return appendAppender(b, v.Interface().(ValueAppender), quote)
}
func appendDriverValuerValue(b []byte, v reflect.Value, quote int) []byte {
return appendDriverValuer(b, v.Interface().(driver.Valuer), quote)
}