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bool.go
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bool.go
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package pgtype
import (
"bytes"
"database/sql/driver"
"encoding/json"
"fmt"
"strconv"
"strings"
)
type BoolScanner interface {
ScanBool(v Bool) error
}
type BoolValuer interface {
BoolValue() (Bool, error)
}
type Bool struct {
Bool bool
Valid bool
}
func (b *Bool) ScanBool(v Bool) error {
*b = v
return nil
}
func (b Bool) BoolValue() (Bool, error) {
return b, nil
}
// Scan implements the database/sql Scanner interface.
func (dst *Bool) Scan(src any) error {
if src == nil {
*dst = Bool{}
return nil
}
switch src := src.(type) {
case bool:
*dst = Bool{Bool: src, Valid: true}
return nil
case string:
b, err := strconv.ParseBool(src)
if err != nil {
return err
}
*dst = Bool{Bool: b, Valid: true}
return nil
case []byte:
b, err := strconv.ParseBool(string(src))
if err != nil {
return err
}
*dst = Bool{Bool: b, Valid: true}
return nil
}
return fmt.Errorf("cannot scan %T", src)
}
// Value implements the database/sql/driver Valuer interface.
func (src Bool) Value() (driver.Value, error) {
if !src.Valid {
return nil, nil
}
return src.Bool, nil
}
func (src Bool) MarshalJSON() ([]byte, error) {
if !src.Valid {
return []byte("null"), nil
}
if src.Bool {
return []byte("true"), nil
} else {
return []byte("false"), nil
}
}
func (dst *Bool) UnmarshalJSON(b []byte) error {
var v *bool
err := json.Unmarshal(b, &v)
if err != nil {
return err
}
if v == nil {
*dst = Bool{}
} else {
*dst = Bool{Bool: *v, Valid: true}
}
return nil
}
type BoolCodec struct{}
func (BoolCodec) FormatSupported(format int16) bool {
return format == TextFormatCode || format == BinaryFormatCode
}
func (BoolCodec) PreferredFormat() int16 {
return BinaryFormatCode
}
func (BoolCodec) PlanEncode(m *Map, oid uint32, format int16, value any) EncodePlan {
switch format {
case BinaryFormatCode:
switch value.(type) {
case bool:
return encodePlanBoolCodecBinaryBool{}
case BoolValuer:
return encodePlanBoolCodecBinaryBoolValuer{}
}
case TextFormatCode:
switch value.(type) {
case bool:
return encodePlanBoolCodecTextBool{}
case BoolValuer:
return encodePlanBoolCodecTextBoolValuer{}
}
}
return nil
}
type encodePlanBoolCodecBinaryBool struct{}
func (encodePlanBoolCodecBinaryBool) Encode(value any, buf []byte) (newBuf []byte, err error) {
v := value.(bool)
if v {
buf = append(buf, 1)
} else {
buf = append(buf, 0)
}
return buf, nil
}
type encodePlanBoolCodecTextBoolValuer struct{}
func (encodePlanBoolCodecTextBoolValuer) Encode(value any, buf []byte) (newBuf []byte, err error) {
b, err := value.(BoolValuer).BoolValue()
if err != nil {
return nil, err
}
if !b.Valid {
return nil, nil
}
if b.Bool {
buf = append(buf, 't')
} else {
buf = append(buf, 'f')
}
return buf, nil
}
type encodePlanBoolCodecBinaryBoolValuer struct{}
func (encodePlanBoolCodecBinaryBoolValuer) Encode(value any, buf []byte) (newBuf []byte, err error) {
b, err := value.(BoolValuer).BoolValue()
if err != nil {
return nil, err
}
if !b.Valid {
return nil, nil
}
if b.Bool {
buf = append(buf, 1)
} else {
buf = append(buf, 0)
}
return buf, nil
}
type encodePlanBoolCodecTextBool struct{}
func (encodePlanBoolCodecTextBool) Encode(value any, buf []byte) (newBuf []byte, err error) {
v := value.(bool)
if v {
buf = append(buf, 't')
} else {
buf = append(buf, 'f')
}
return buf, nil
}
func (BoolCodec) PlanScan(m *Map, oid uint32, format int16, target any) ScanPlan {
switch format {
case BinaryFormatCode:
switch target.(type) {
case *bool:
return scanPlanBinaryBoolToBool{}
case BoolScanner:
return scanPlanBinaryBoolToBoolScanner{}
}
case TextFormatCode:
switch target.(type) {
case *bool:
return scanPlanTextAnyToBool{}
case BoolScanner:
return scanPlanTextAnyToBoolScanner{}
}
}
return nil
}
func (c BoolCodec) DecodeDatabaseSQLValue(m *Map, oid uint32, format int16, src []byte) (driver.Value, error) {
return c.DecodeValue(m, oid, format, src)
}
func (c BoolCodec) DecodeValue(m *Map, oid uint32, format int16, src []byte) (any, error) {
if src == nil {
return nil, nil
}
var b bool
err := codecScan(c, m, oid, format, src, &b)
if err != nil {
return nil, err
}
return b, nil
}
type scanPlanBinaryBoolToBool struct{}
func (scanPlanBinaryBoolToBool) Scan(src []byte, dst any) error {
if src == nil {
return fmt.Errorf("cannot scan NULL into %T", dst)
}
if len(src) != 1 {
return fmt.Errorf("invalid length for bool: %v", len(src))
}
p, ok := (dst).(*bool)
if !ok {
return ErrScanTargetTypeChanged
}
*p = src[0] == 1
return nil
}
type scanPlanTextAnyToBool struct{}
func (scanPlanTextAnyToBool) Scan(src []byte, dst any) error {
if src == nil {
return fmt.Errorf("cannot scan NULL into %T", dst)
}
if len(src) == 0 {
return fmt.Errorf("cannot scan empty string into %T", dst)
}
p, ok := (dst).(*bool)
if !ok {
return ErrScanTargetTypeChanged
}
v, err := planTextToBool(src)
if err != nil {
return err
}
*p = v
return nil
}
type scanPlanBinaryBoolToBoolScanner struct{}
func (scanPlanBinaryBoolToBoolScanner) Scan(src []byte, dst any) error {
s, ok := (dst).(BoolScanner)
if !ok {
return ErrScanTargetTypeChanged
}
if src == nil {
return s.ScanBool(Bool{})
}
if len(src) != 1 {
return fmt.Errorf("invalid length for bool: %v", len(src))
}
return s.ScanBool(Bool{Bool: src[0] == 1, Valid: true})
}
type scanPlanTextAnyToBoolScanner struct{}
func (scanPlanTextAnyToBoolScanner) Scan(src []byte, dst any) error {
s, ok := (dst).(BoolScanner)
if !ok {
return ErrScanTargetTypeChanged
}
if src == nil {
return s.ScanBool(Bool{})
}
if len(src) == 0 {
return fmt.Errorf("cannot scan empty string into %T", dst)
}
v, err := planTextToBool(src)
if err != nil {
return err
}
return s.ScanBool(Bool{Bool: v, Valid: true})
}
// https://www.postgresql.org/docs/11/datatype-boolean.html
func planTextToBool(src []byte) (bool, error) {
s := string(bytes.ToLower(bytes.TrimSpace(src)))
switch {
case strings.HasPrefix("true", s), strings.HasPrefix("yes", s), s == "on", s == "1":
return true, nil
case strings.HasPrefix("false", s), strings.HasPrefix("no", s), strings.HasPrefix("off", s), s == "0":
return false, nil
default:
return false, fmt.Errorf("unknown boolean string representation %q", src)
}
}