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text.go
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text.go
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package pgtype
import (
"database/sql/driver"
"encoding/json"
"fmt"
)
type TextScanner interface {
ScanText(v Text) error
}
type TextValuer interface {
TextValue() (Text, error)
}
type Text struct {
String string
Valid bool
}
func (t *Text) ScanText(v Text) error {
*t = v
return nil
}
func (t Text) TextValue() (Text, error) {
return t, nil
}
// Scan implements the database/sql Scanner interface.
func (dst *Text) Scan(src any) error {
if src == nil {
*dst = Text{}
return nil
}
switch src := src.(type) {
case string:
*dst = Text{String: src, Valid: true}
return nil
case []byte:
*dst = Text{String: string(src), Valid: true}
return nil
}
return fmt.Errorf("cannot scan %T", src)
}
// Value implements the database/sql/driver Valuer interface.
func (src Text) Value() (driver.Value, error) {
if !src.Valid {
return nil, nil
}
return src.String, nil
}
func (src Text) MarshalJSON() ([]byte, error) {
if !src.Valid {
return []byte("null"), nil
}
return json.Marshal(src.String)
}
func (dst *Text) UnmarshalJSON(b []byte) error {
var s *string
err := json.Unmarshal(b, &s)
if err != nil {
return err
}
if s == nil {
*dst = Text{}
} else {
*dst = Text{String: *s, Valid: true}
}
return nil
}
type TextCodec struct{}
func (TextCodec) FormatSupported(format int16) bool {
return format == TextFormatCode || format == BinaryFormatCode
}
func (TextCodec) PreferredFormat() int16 {
return TextFormatCode
}
func (TextCodec) PlanEncode(m *Map, oid uint32, format int16, value any) EncodePlan {
switch format {
case TextFormatCode, BinaryFormatCode:
switch value.(type) {
case string:
return encodePlanTextCodecString{}
case []byte:
return encodePlanTextCodecByteSlice{}
case TextValuer:
return encodePlanTextCodecTextValuer{}
}
}
return nil
}
type encodePlanTextCodecString struct{}
func (encodePlanTextCodecString) Encode(value any, buf []byte) (newBuf []byte, err error) {
s := value.(string)
buf = append(buf, s...)
return buf, nil
}
type encodePlanTextCodecByteSlice struct{}
func (encodePlanTextCodecByteSlice) Encode(value any, buf []byte) (newBuf []byte, err error) {
s := value.([]byte)
buf = append(buf, s...)
return buf, nil
}
type encodePlanTextCodecStringer struct{}
func (encodePlanTextCodecStringer) Encode(value any, buf []byte) (newBuf []byte, err error) {
s := value.(fmt.Stringer)
buf = append(buf, s.String()...)
return buf, nil
}
type encodePlanTextCodecTextValuer struct{}
func (encodePlanTextCodecTextValuer) Encode(value any, buf []byte) (newBuf []byte, err error) {
text, err := value.(TextValuer).TextValue()
if err != nil {
return nil, err
}
if !text.Valid {
return nil, nil
}
buf = append(buf, text.String...)
return buf, nil
}
func (TextCodec) PlanScan(m *Map, oid uint32, format int16, target any) ScanPlan {
switch format {
case TextFormatCode, BinaryFormatCode:
switch target.(type) {
case *string:
return scanPlanTextAnyToString{}
case *[]byte:
return scanPlanAnyToNewByteSlice{}
case BytesScanner:
return scanPlanAnyToByteScanner{}
case TextScanner:
return scanPlanTextAnyToTextScanner{}
}
}
return nil
}
func (c TextCodec) DecodeDatabaseSQLValue(m *Map, oid uint32, format int16, src []byte) (driver.Value, error) {
return c.DecodeValue(m, oid, format, src)
}
func (c TextCodec) DecodeValue(m *Map, oid uint32, format int16, src []byte) (any, error) {
if src == nil {
return nil, nil
}
return string(src), nil
}
type scanPlanTextAnyToString struct{}
func (scanPlanTextAnyToString) Scan(src []byte, dst any) error {
if src == nil {
return fmt.Errorf("cannot scan NULL into %T", dst)
}
p := (dst).(*string)
*p = string(src)
return nil
}
type scanPlanAnyToNewByteSlice struct{}
func (scanPlanAnyToNewByteSlice) Scan(src []byte, dst any) error {
p := (dst).(*[]byte)
if src == nil {
*p = nil
} else {
*p = make([]byte, len(src))
copy(*p, src)
}
return nil
}
type scanPlanAnyToByteScanner struct{}
func (scanPlanAnyToByteScanner) Scan(src []byte, dst any) error {
p := (dst).(BytesScanner)
return p.ScanBytes(src)
}
type scanPlanTextAnyToTextScanner struct{}
func (scanPlanTextAnyToTextScanner) Scan(src []byte, dst any) error {
scanner := (dst).(TextScanner)
if src == nil {
return scanner.ScanText(Text{})
}
return scanner.ScanText(Text{String: string(src), Valid: true})
}