mirror of https://github.com/jackc/pgx.git
143 lines
2.6 KiB
Go
143 lines
2.6 KiB
Go
package pgtype
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import (
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"database/sql/driver"
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"encoding/binary"
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"fmt"
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"io"
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"math"
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"strconv"
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"strings"
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"github.com/jackc/pgx/pgio"
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)
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type Vec2 struct {
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X float64
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Y float64
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}
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type Point struct {
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P Vec2
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Status Status
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}
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func (dst *Point) Set(src interface{}) error {
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return fmt.Errorf("cannot convert %v to Point", src)
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}
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func (dst *Point) Get() interface{} {
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switch dst.Status {
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case Present:
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return dst
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case Null:
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return nil
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default:
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return dst.Status
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}
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}
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func (src *Point) AssignTo(dst interface{}) error {
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return fmt.Errorf("cannot assign %v to %T", src, dst)
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}
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func (dst *Point) DecodeText(ci *ConnInfo, src []byte) error {
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if src == nil {
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*dst = Point{Status: Null}
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return nil
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}
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if len(src) < 5 {
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return fmt.Errorf("invalid length for point: %v", len(src))
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}
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parts := strings.SplitN(string(src[1:len(src)-1]), ",", 2)
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if len(parts) < 2 {
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return fmt.Errorf("invalid format for point")
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}
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x, err := strconv.ParseFloat(parts[0], 64)
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if err != nil {
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return err
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}
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y, err := strconv.ParseFloat(parts[1], 64)
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if err != nil {
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return err
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}
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*dst = Point{P: Vec2{x, y}, Status: Present}
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return nil
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}
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func (dst *Point) DecodeBinary(ci *ConnInfo, src []byte) error {
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if src == nil {
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*dst = Point{Status: Null}
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return nil
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}
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if len(src) != 16 {
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return fmt.Errorf("invalid length for point: %v", len(src))
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}
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x := binary.BigEndian.Uint64(src)
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y := binary.BigEndian.Uint64(src[8:])
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*dst = Point{
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P: Vec2{math.Float64frombits(x), math.Float64frombits(y)},
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Status: Present,
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}
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return nil
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}
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func (src *Point) EncodeText(ci *ConnInfo, w io.Writer) (bool, error) {
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switch src.Status {
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case Null:
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return true, nil
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case Undefined:
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return false, errUndefined
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}
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_, err := io.WriteString(w, fmt.Sprintf(`(%f,%f)`, src.P.X, src.P.Y))
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return false, err
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}
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func (src *Point) EncodeBinary(ci *ConnInfo, w io.Writer) (bool, error) {
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switch src.Status {
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case Null:
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return true, nil
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case Undefined:
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return false, errUndefined
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}
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_, err := pgio.WriteUint64(w, math.Float64bits(src.P.X))
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if err != nil {
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return false, err
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}
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_, err = pgio.WriteUint64(w, math.Float64bits(src.P.Y))
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return false, err
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}
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// Scan implements the database/sql Scanner interface.
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func (dst *Point) Scan(src interface{}) error {
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if src == nil {
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*dst = Point{Status: Null}
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return nil
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}
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switch src := src.(type) {
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case string:
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return dst.DecodeText(nil, []byte(src))
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case []byte:
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return dst.DecodeText(nil, src)
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}
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return fmt.Errorf("cannot scan %T", src)
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}
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// Value implements the database/sql/driver Valuer interface.
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func (src *Point) Value() (driver.Value, error) {
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return EncodeValueText(src)
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}
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