Add path

pgtype/path.go

@@ -0,0 +1,207 @@
+package pgtype
+
+import (
+	"database/sql/driver"
+	"encoding/binary"
+	"fmt"
+	"io"
+	"math"
+	"strconv"
+	"strings"
+
+	"github.com/jackc/pgx/pgio"
+)
+
+type Path struct {
+	P      []Vec2
+	Closed bool
+	Status Status
+}
+
+func (dst *Path) Set(src interface{}) error {
+	return fmt.Errorf("cannot convert %v to Path", src)
+}
+
+func (dst *Path) Get() interface{} {
+	switch dst.Status {
+	case Present:
+		return dst
+	case Null:
+		return nil
+	default:
+		return dst.Status
+	}
+}
+
+func (src *Path) AssignTo(dst interface{}) error {
+	return fmt.Errorf("cannot assign %v to %T", src, dst)
+}
+
+func (dst *Path) DecodeText(ci *ConnInfo, src []byte) error {
+	if src == nil {
+		*dst = Path{Status: Null}
+		return nil
+	}
+
+	if len(src) < 7 {
+		return fmt.Errorf("invalid length for Path: %v", len(src))
+	}
+
+	closed := src[0] == '('
+	points := make([]Vec2, 0)
+
+	str := string(src[2:])
+
+	for {
+		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
+		}
+
+		points = append(points, Vec2{x, y})
+
+		if end+3 < len(str) {
+			str = str[end+3:]
+		} else {
+			break
+		}
+	}
+
+	*dst = Path{P: points, Closed: closed, Status: Present}
+	return nil
+}
+
+func (dst *Path) DecodeBinary(ci *ConnInfo, src []byte) error {
+	if src == nil {
+		*dst = Path{Status: Null}
+		return nil
+	}
+
+	if len(src) < 5 {
+		return fmt.Errorf("invalid length for Path: %v", len(src))
+	}
+
+	closed := src[0] == 1
+	pointCount := int(binary.BigEndian.Uint32(src[1:]))
+
+	rp := 5
+
+	if 5+pointCount*16 != len(src) {
+		return fmt.Errorf("invalid length for Path with %d points: %v", pointCount, len(src))
+	}
+
+	points := make([]Vec2, pointCount)
+	for i := 0; i < len(points); i++ {
+		x := binary.BigEndian.Uint64(src[rp:])
+		rp += 8
+		y := binary.BigEndian.Uint64(src[rp:])
+		rp += 8
+		points[i] = Vec2{math.Float64frombits(x), math.Float64frombits(y)}
+	}
+
+	*dst = Path{
+		P:      points,
+		Closed: closed,
+		Status: Present,
+	}
+	return nil
+}
+
+func (src *Path) EncodeText(ci *ConnInfo, w io.Writer) (bool, error) {
+	switch src.Status {
+	case Null:
+		return true, nil
+	case Undefined:
+		return false, errUndefined
+	}
+
+	var startByte, endByte byte
+	if src.Closed {
+		startByte = '('
+		endByte = ')'
+	} else {
+		startByte = '['
+		endByte = ']'
+	}
+	if err := pgio.WriteByte(w, startByte); err != nil {
+		return false, err
+	}
+
+	for i, p := range src.P {
+		if i > 0 {
+			if err := pgio.WriteByte(w, ','); err != nil {
+				return false, err
+			}
+		}
+		if _, err := io.WriteString(w, fmt.Sprintf(`(%f,%f)`, p.X, p.Y)); err != nil {
+			return false, err
+		}
+	}
+
+	err := pgio.WriteByte(w, endByte)
+	return false, err
+}
+
+func (src *Path) EncodeBinary(ci *ConnInfo, w io.Writer) (bool, error) {
+	switch src.Status {
+	case Null:
+		return true, nil
+	case Undefined:
+		return false, errUndefined
+	}
+
+	var closeByte byte
+	if src.Closed {
+		closeByte = 1
+	}
+	if err := pgio.WriteByte(w, closeByte); err != nil {
+		return false, err
+	}
+
+	if _, err := pgio.WriteInt32(w, int32(len(src.P))); err != nil {
+		return false, err
+	}
+
+	for _, p := range src.P {
+		if _, err := pgio.WriteUint64(w, math.Float64bits(p.X)); err != nil {
+			return false, err
+		}
+
+		if _, err := pgio.WriteUint64(w, math.Float64bits(p.Y)); err != nil {
+			return false, err
+		}
+	}
+
+	return false, nil
+}
+
+// Scan implements the database/sql Scanner interface.
+func (dst *Path) Scan(src interface{}) error {
+	if src == nil {
+		*dst = Path{Status: Null}
+		return nil
+	}
+
+	switch src := src.(type) {
+	case string:
+		return dst.DecodeText(nil, []byte(src))
+	case []byte:
+		return dst.DecodeText(nil, src)
+	}
+
+	return fmt.Errorf("cannot scan %T", src)
+}
+
+// Value implements the database/sql/driver Valuer interface.
+func (src *Path) Value() (driver.Value, error) {
+	return encodeValueText(src)
+}

pgtype/path_test.go

@@ -0,0 +1,28 @@
+package pgtype_test
+
+import (
+	"testing"
+
+	"github.com/jackc/pgx/pgtype"
+)
+
+func TestPathTranscode(t *testing.T) {
+	testSuccessfulTranscode(t, "path", []interface{}{
+		&pgtype.Path{
+			P:      []pgtype.Vec2{{3.14, 1.678}, {7.1, 5.234}},
+			Closed: false,
+			Status: pgtype.Present,
+		},
+		&pgtype.Path{
+			P:      []pgtype.Vec2{{3.14, 1.678}, {7.1, 5.234}, {23.1, 9.34}},
+			Closed: true,
+			Status: pgtype.Present,
+		},
+		&pgtype.Path{
+			P:      []pgtype.Vec2{{7.1, 1.678}, {-13.14, -5.234}},
+			Closed: true,
+			Status: pgtype.Present,
+		},
+		&pgtype.Path{Status: pgtype.Null},
+	})
+}

pgtype/pgtype.go

@@ -248,6 +248,7 @@ func init() {
 		"numeric":      &Numeric{},
 		"numrange":     &Numrange{},
 		"oid":          &OidValue{},
+		"path":         &Path{},
 		"point":        &Point{},
 		"record":       &Record{},
 		"text":         &Text{},

v3.md

@@ -68,8 +68,6 @@ something like:
 select array[1,2,3], array[4,5,6,7]
 
 pgtype TODO:
-path
-path
 polygon
 circle
 macaddr