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package pgtype
import (
"database/sql/driver"
"encoding/binary"
"encoding/json"
"fmt"
"math"
"strconv"
"github.com/jackc/pgx/v5/internal/pgio"
)
type Float4 struct {
Float32 float32
Valid bool
}
// ScanFloat64 implements the [Float64Scanner] interface.
func (f *Float4) ScanFloat64(n Float8) error {
*f = Float4{Float32: float32(n.Float64), Valid: n.Valid}
return nil
}
// Float64Value implements the [Float64Valuer] interface.
func (f Float4) Float64Value() (Float8, error) {
return Float8{Float64: float64(f.Float32), Valid: f.Valid}, nil
}
// ScanInt64 implements the [Int64Scanner] interface.
func (f *Float4) ScanInt64(n Int8) error {
*f = Float4{Float32: float32(n.Int64), Valid: n.Valid}
return nil
}
// Int64Value implements the [Int64Valuer] interface.
func (f Float4) Int64Value() (Int8, error) {
return Int8{Int64: int64(f.Float32), Valid: f.Valid}, nil
}
// Scan implements the [database/sql.Scanner] interface.
func (f *Float4) Scan(src any) error {
if src == nil {
*f = Float4{}
return nil
}
switch src := src.(type) {
case float64:
*f = Float4{Float32: float32(src), Valid: true}
return nil
case string:
n, err := strconv.ParseFloat(string(src), 32)
if err != nil {
return err
}
*f = Float4{Float32: float32(n), Valid: true}
return nil
}
return fmt.Errorf("cannot scan %T", src)
}
// Value implements the [database/sql/driver.Valuer] interface.
func (f Float4) Value() (driver.Value, error) {
if !f.Valid {
return nil, nil
}
return float64(f.Float32), nil
}
// MarshalJSON implements the [encoding/json.Marshaler] interface.
func (f Float4) MarshalJSON() ([]byte, error) {
if !f.Valid {
return []byte("null"), nil
}
return json.Marshal(f.Float32)
}
// UnmarshalJSON implements the [encoding/json.Unmarshaler] interface.
func (f *Float4) UnmarshalJSON(b []byte) error {
var n *float32
err := json.Unmarshal(b, &n)
if err != nil {
return err
}
if n == nil {
*f = Float4{}
} else {
*f = Float4{Float32: *n, Valid: true}
}
return nil
}
type Float4Codec struct{}
func (Float4Codec) FormatSupported(format int16) bool {
return format == TextFormatCode || format == BinaryFormatCode
}
func (Float4Codec) PreferredFormat() int16 {
return BinaryFormatCode
}
func (Float4Codec) PlanEncode(m *Map, oid uint32, format int16, value any) EncodePlan {
switch format {
case BinaryFormatCode:
switch value.(type) {
case float32:
return encodePlanFloat4CodecBinaryFloat32{}
case Float64Valuer:
return encodePlanFloat4CodecBinaryFloat64Valuer{}
case Int64Valuer:
return encodePlanFloat4CodecBinaryInt64Valuer{}
}
case TextFormatCode:
switch value.(type) {
case float32:
return encodePlanTextFloat32{}
case Float64Valuer:
return encodePlanTextFloat64Valuer{}
case Int64Valuer:
return encodePlanTextInt64Valuer{}
}
}
return nil
}
type encodePlanFloat4CodecBinaryFloat32 struct{}
func (encodePlanFloat4CodecBinaryFloat32) Encode(value any, buf []byte) (newBuf []byte, err error) {
n := value.(float32)
return pgio.AppendUint32(buf, math.Float32bits(n)), nil
}
type encodePlanTextFloat32 struct{}
func (encodePlanTextFloat32) Encode(value any, buf []byte) (newBuf []byte, err error) {
n := value.(float32)
return append(buf, strconv.FormatFloat(float64(n), 'f', -1, 32)...), nil
}
type encodePlanFloat4CodecBinaryFloat64Valuer struct{}
func (encodePlanFloat4CodecBinaryFloat64Valuer) Encode(value any, buf []byte) (newBuf []byte, err error) {
n, err := value.(Float64Valuer).Float64Value()
if err != nil {
return nil, err
}
if !n.Valid {
return nil, nil
}
return pgio.AppendUint32(buf, math.Float32bits(float32(n.Float64))), nil
}
type encodePlanFloat4CodecBinaryInt64Valuer struct{}
func (encodePlanFloat4CodecBinaryInt64Valuer) Encode(value any, buf []byte) (newBuf []byte, err error) {
n, err := value.(Int64Valuer).Int64Value()
if err != nil {
return nil, err
}
if !n.Valid {
return nil, nil
}
f := float32(n.Int64)
return pgio.AppendUint32(buf, math.Float32bits(f)), nil
}
func (Float4Codec) PlanScan(m *Map, oid uint32, format int16, target any) ScanPlan {
switch format {
case BinaryFormatCode:
switch target.(type) {
case *float32:
return scanPlanBinaryFloat4ToFloat32{}
case Float64Scanner:
return scanPlanBinaryFloat4ToFloat64Scanner{}
case Int64Scanner:
return scanPlanBinaryFloat4ToInt64Scanner{}
case TextScanner:
return scanPlanBinaryFloat4ToTextScanner{}
}
case TextFormatCode:
switch target.(type) {
case *float32:
return scanPlanTextAnyToFloat32{}
case Float64Scanner:
return scanPlanTextAnyToFloat64Scanner{}
case Int64Scanner:
return scanPlanTextAnyToInt64Scanner{}
}
}
return nil
}
type scanPlanBinaryFloat4ToFloat32 struct{}
func (scanPlanBinaryFloat4ToFloat32) Scan(src []byte, dst any) error {
if src == nil {
return fmt.Errorf("cannot scan NULL into %T", dst)
}
if len(src) != 4 {
return fmt.Errorf("invalid length for float4: %v", len(src))
}
n := int32(binary.BigEndian.Uint32(src))
f := (dst).(*float32)
*f = math.Float32frombits(uint32(n))
return nil
}
type scanPlanBinaryFloat4ToFloat64Scanner struct{}
func (scanPlanBinaryFloat4ToFloat64Scanner) Scan(src []byte, dst any) error {
s := (dst).(Float64Scanner)
if src == nil {
return s.ScanFloat64(Float8{})
}
if len(src) != 4 {
return fmt.Errorf("invalid length for float4: %v", len(src))
}
n := int32(binary.BigEndian.Uint32(src))
return s.ScanFloat64(Float8{Float64: float64(math.Float32frombits(uint32(n))), Valid: true})
}
type scanPlanBinaryFloat4ToInt64Scanner struct{}
func (scanPlanBinaryFloat4ToInt64Scanner) Scan(src []byte, dst any) error {
s := (dst).(Int64Scanner)
if src == nil {
return s.ScanInt64(Int8{})
}
if len(src) != 4 {
return fmt.Errorf("invalid length for float4: %v", len(src))
}
ui32 := int32(binary.BigEndian.Uint32(src))
f32 := math.Float32frombits(uint32(ui32))
i64 := int64(f32)
if f32 != float32(i64) {
return fmt.Errorf("cannot losslessly convert %v to int64", f32)
}
return s.ScanInt64(Int8{Int64: i64, Valid: true})
}
type scanPlanBinaryFloat4ToTextScanner struct{}
func (scanPlanBinaryFloat4ToTextScanner) Scan(src []byte, dst any) error {
s := (dst).(TextScanner)
if src == nil {
return s.ScanText(Text{})
}
if len(src) != 4 {
return fmt.Errorf("invalid length for float4: %v", len(src))
}
ui32 := int32(binary.BigEndian.Uint32(src))
f32 := math.Float32frombits(uint32(ui32))
return s.ScanText(Text{String: strconv.FormatFloat(float64(f32), 'f', -1, 32), Valid: true})
}
type scanPlanTextAnyToFloat32 struct{}
func (scanPlanTextAnyToFloat32) Scan(src []byte, dst any) error {
if src == nil {
return fmt.Errorf("cannot scan NULL into %T", dst)
}
n, err := strconv.ParseFloat(string(src), 32)
if err != nil {
return err
}
f := (dst).(*float32)
*f = float32(n)
return nil
}
func (c Float4Codec) DecodeDatabaseSQLValue(m *Map, oid uint32, format int16, src []byte) (driver.Value, error) {
if src == nil {
return nil, nil
}
var n float32
err := codecScan(c, m, oid, format, src, &n)
if err != nil {
return nil, err
}
return float64(n), nil
}
func (c Float4Codec) DecodeValue(m *Map, oid uint32, format int16, src []byte) (any, error) {
if src == nil {
return nil, nil
}
var n float32
err := codecScan(c, m, oid, format, src, &n)
if err != nil {
return nil, err
}
return n, nil
}
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