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circle.go
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circle.go
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package pgtype
import (
"database/sql/driver"
"encoding/binary"
"fmt"
"math"
"strconv"
"strings"
"github.com/jackc/pgx/v5/internal/pgio"
)
type CircleScanner interface {
ScanCircle(v Circle) error
}
type CircleValuer interface {
CircleValue() (Circle, error)
}
type Circle struct {
P Vec2
R float64
Valid bool
}
func (c *Circle) ScanCircle(v Circle) error {
*c = v
return nil
}
func (c Circle) CircleValue() (Circle, error) {
return c, nil
}
// Scan implements the database/sql Scanner interface.
func (dst *Circle) Scan(src any) error {
if src == nil {
*dst = Circle{}
return nil
}
switch src := src.(type) {
case string:
return scanPlanTextAnyToCircleScanner{}.Scan([]byte(src), dst)
}
return fmt.Errorf("cannot scan %T", src)
}
// Value implements the database/sql/driver Valuer interface.
func (src Circle) Value() (driver.Value, error) {
if !src.Valid {
return nil, nil
}
buf, err := CircleCodec{}.PlanEncode(nil, 0, TextFormatCode, src).Encode(src, nil)
if err != nil {
return nil, err
}
return string(buf), err
}
type CircleCodec struct{}
func (CircleCodec) FormatSupported(format int16) bool {
return format == TextFormatCode || format == BinaryFormatCode
}
func (CircleCodec) PreferredFormat() int16 {
return BinaryFormatCode
}
func (CircleCodec) PlanEncode(m *Map, oid uint32, format int16, value any) EncodePlan {
if _, ok := value.(CircleValuer); !ok {
return nil
}
switch format {
case BinaryFormatCode:
return encodePlanCircleCodecBinary{}
case TextFormatCode:
return encodePlanCircleCodecText{}
}
return nil
}
type encodePlanCircleCodecBinary struct{}
func (encodePlanCircleCodecBinary) Encode(value any, buf []byte) (newBuf []byte, err error) {
circle, err := value.(CircleValuer).CircleValue()
if err != nil {
return nil, err
}
if !circle.Valid {
return nil, nil
}
buf = pgio.AppendUint64(buf, math.Float64bits(circle.P.X))
buf = pgio.AppendUint64(buf, math.Float64bits(circle.P.Y))
buf = pgio.AppendUint64(buf, math.Float64bits(circle.R))
return buf, nil
}
type encodePlanCircleCodecText struct{}
func (encodePlanCircleCodecText) Encode(value any, buf []byte) (newBuf []byte, err error) {
circle, err := value.(CircleValuer).CircleValue()
if err != nil {
return nil, err
}
if !circle.Valid {
return nil, nil
}
buf = append(buf, fmt.Sprintf(`<(%s,%s),%s>`,
strconv.FormatFloat(circle.P.X, 'f', -1, 64),
strconv.FormatFloat(circle.P.Y, 'f', -1, 64),
strconv.FormatFloat(circle.R, 'f', -1, 64),
)...)
return buf, nil
}
func (CircleCodec) PlanScan(m *Map, oid uint32, format int16, target any) ScanPlan {
switch format {
case BinaryFormatCode:
switch target.(type) {
case CircleScanner:
return scanPlanBinaryCircleToCircleScanner{}
}
case TextFormatCode:
switch target.(type) {
case CircleScanner:
return scanPlanTextAnyToCircleScanner{}
}
}
return nil
}
func (c CircleCodec) DecodeDatabaseSQLValue(m *Map, oid uint32, format int16, src []byte) (driver.Value, error) {
return codecDecodeToTextFormat(c, m, oid, format, src)
}
func (c CircleCodec) DecodeValue(m *Map, oid uint32, format int16, src []byte) (any, error) {
if src == nil {
return nil, nil
}
var circle Circle
err := codecScan(c, m, oid, format, src, &circle)
if err != nil {
return nil, err
}
return circle, nil
}
type scanPlanBinaryCircleToCircleScanner struct{}
func (scanPlanBinaryCircleToCircleScanner) Scan(src []byte, dst any) error {
scanner := (dst).(CircleScanner)
if src == nil {
return scanner.ScanCircle(Circle{})
}
if len(src) != 24 {
return fmt.Errorf("invalid length for Circle: %v", len(src))
}
x := binary.BigEndian.Uint64(src)
y := binary.BigEndian.Uint64(src[8:])
r := binary.BigEndian.Uint64(src[16:])
return scanner.ScanCircle(Circle{
P: Vec2{math.Float64frombits(x), math.Float64frombits(y)},
R: math.Float64frombits(r),
Valid: true,
})
}
type scanPlanTextAnyToCircleScanner struct{}
func (scanPlanTextAnyToCircleScanner) Scan(src []byte, dst any) error {
scanner := (dst).(CircleScanner)
if src == nil {
return scanner.ScanCircle(Circle{})
}
if len(src) < 9 {
return fmt.Errorf("invalid length for Circle: %v", len(src))
}
str := string(src[2:])
end := strings.IndexByte(str, ',')
x, err := strconv.ParseFloat(str[:end], 64)
if err != nil {
return err
}
str = str[end+1:]
end = strings.IndexByte(str, ')')
y, err := strconv.ParseFloat(str[:end], 64)
if err != nil {
return err
}
str = str[end+2 : len(str)-1]
r, err := strconv.ParseFloat(str, 64)
if err != nil {
return err
}
return scanner.ScanCircle(Circle{P: Vec2{x, y}, R: r, Valid: true})
}