Import to pgx main repo in pgtype subdir

2021-12-04 13:07:54 -06:00
parent 550cc7b529
commit 44214b7854
237 changed files with 0 additions and 0 deletions
@@ -0,0 +1,200 @@
+package pgtype
+
+import (
+	"bytes"
+	"database/sql/driver"
+	"encoding/binary"
+	"fmt"
+	"math"
+	"strconv"
+	"strings"
+
+	"github.com/jackc/pgio"
+)
+
+type Vec2 struct {
+	X float64
+	Y float64
+}
+
+type Point struct {
+	P     Vec2
+	Valid bool
+}
+
+func (dst *Point) Set(src interface{}) error {
+	if src == nil {
+		dst.Valid = false
+		return nil
+	}
+	err := fmt.Errorf("cannot convert %v to Point", src)
+	var p *Point
+	switch value := src.(type) {
+	case string:
+		p, err = parsePoint([]byte(value))
+	case []byte:
+		p, err = parsePoint(value)
+	default:
+		return err
+	}
+	if err != nil {
+		return err
+	}
+	*dst = *p
+	return nil
+}
+
+func parsePoint(src []byte) (*Point, error) {
+	if src == nil || bytes.Compare(src, []byte("null")) == 0 {
+		return &Point{}, nil
+	}
+
+	if len(src) < 5 {
+		return nil, fmt.Errorf("invalid length for point: %v", len(src))
+	}
+	if src[0] == '"' && src[len(src)-1] == '"' {
+		src = src[1 : len(src)-1]
+	}
+	parts := strings.SplitN(string(src[1:len(src)-1]), ",", 2)
+	if len(parts) < 2 {
+		return nil, fmt.Errorf("invalid format for point")
+	}
+
+	x, err := strconv.ParseFloat(parts[0], 64)
+	if err != nil {
+		return nil, err
+	}
+
+	y, err := strconv.ParseFloat(parts[1], 64)
+	if err != nil {
+		return nil, err
+	}
+
+	return &Point{P: Vec2{x, y}, Valid: true}, nil
+}
+
+func (dst Point) Get() interface{} {
+	if !dst.Valid {
+		return nil
+	}
+	return dst
+}
+
+func (src *Point) AssignTo(dst interface{}) error {
+	return fmt.Errorf("cannot assign %v to %T", src, dst)
+}
+
+func (dst *Point) DecodeText(ci *ConnInfo, src []byte) error {
+	if src == nil {
+		*dst = Point{}
+		return nil
+	}
+
+	if len(src) < 5 {
+		return fmt.Errorf("invalid length for point: %v", len(src))
+	}
+
+	parts := strings.SplitN(string(src[1:len(src)-1]), ",", 2)
+	if len(parts) < 2 {
+		return fmt.Errorf("invalid format for point")
+	}
+
+	x, err := strconv.ParseFloat(parts[0], 64)
+	if err != nil {
+		return err
+	}
+
+	y, err := strconv.ParseFloat(parts[1], 64)
+	if err != nil {
+		return err
+	}
+
+	*dst = Point{P: Vec2{x, y}, Valid: true}
+	return nil
+}
+
+func (dst *Point) DecodeBinary(ci *ConnInfo, src []byte) error {
+	if src == nil {
+		*dst = Point{}
+		return nil
+	}
+
+	if len(src) != 16 {
+		return fmt.Errorf("invalid length for point: %v", len(src))
+	}
+
+	x := binary.BigEndian.Uint64(src)
+	y := binary.BigEndian.Uint64(src[8:])
+
+	*dst = Point{
+		P:     Vec2{math.Float64frombits(x), math.Float64frombits(y)},
+		Valid: true,
+	}
+	return nil
+}
+
+func (src Point) EncodeText(ci *ConnInfo, buf []byte) ([]byte, error) {
+	if !src.Valid {
+		return nil, nil
+	}
+
+	return append(buf, fmt.Sprintf(`(%s,%s)`,
+		strconv.FormatFloat(src.P.X, 'f', -1, 64),
+		strconv.FormatFloat(src.P.Y, 'f', -1, 64),
+	)...), nil
+}
+
+func (src Point) EncodeBinary(ci *ConnInfo, buf []byte) ([]byte, error) {
+	if !src.Valid {
+		return nil, nil
+	}
+
+	buf = pgio.AppendUint64(buf, math.Float64bits(src.P.X))
+	buf = pgio.AppendUint64(buf, math.Float64bits(src.P.Y))
+	return buf, nil
+}
+
+// Scan implements the database/sql Scanner interface.
+func (dst *Point) Scan(src interface{}) error {
+	if src == nil {
+		*dst = Point{}
+		return nil
+	}
+
+	switch src := src.(type) {
+	case string:
+		return dst.DecodeText(nil, []byte(src))
+	case []byte:
+		srcCopy := make([]byte, len(src))
+		copy(srcCopy, src)
+		return dst.DecodeText(nil, srcCopy)
+	}
+
+	return fmt.Errorf("cannot scan %T", src)
+}
+
+// Value implements the database/sql/driver Valuer interface.
+func (src Point) Value() (driver.Value, error) {
+	return EncodeValueText(src)
+}
+
+func (src Point) MarshalJSON() ([]byte, error) {
+	if !src.Valid {
+		return []byte("null"), nil
+	}
+
+	var buff bytes.Buffer
+	buff.WriteByte('"')
+	buff.WriteString(fmt.Sprintf("(%g,%g)", src.P.X, src.P.Y))
+	buff.WriteByte('"')
+	return buff.Bytes(), nil
+}
+
+func (dst *Point) UnmarshalJSON(point []byte) error {
+	p, err := parsePoint(point)
+	if err != nil {
+		return err
+	}
+	*dst = *p
+	return nil
+}