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 +1,215 @@
+package pgtype
+
+import (
+	"database/sql/driver"
+	"encoding/binary"
+	"fmt"
+	"math"
+	"strconv"
+	"strings"
+
+	"github.com/jackc/pgio"
+)
+
+type Polygon struct {
+	P     []Vec2
+	Valid bool
+}
+
+// Set converts src to dest.
+//
+// src can be nil, string, []float64, and []pgtype.Vec2.
+//
+// If src is string the format must be ((x1,y1),(x2,y2),...,(xn,yn)).
+// Important that there are no spaces in it.
+func (dst *Polygon) Set(src interface{}) error {
+	if src == nil {
+		dst.Valid = false
+		return nil
+	}
+	err := fmt.Errorf("cannot convert %v to Polygon", src)
+	var p *Polygon
+	switch value := src.(type) {
+	case string:
+		p, err = stringToPolygon(value)
+	case []Vec2:
+		p = &Polygon{Valid: true, P: value}
+		err = nil
+	case []float64:
+		p, err = float64ToPolygon(value)
+	default:
+		return err
+	}
+	if err != nil {
+		return err
+	}
+	*dst = *p
+	return nil
+}
+
+func stringToPolygon(src string) (*Polygon, error) {
+	p := &Polygon{}
+	err := p.DecodeText(nil, []byte(src))
+	return p, err
+}
+
+func float64ToPolygon(src []float64) (*Polygon, error) {
+	p := &Polygon{}
+	if len(src) == 0 {
+		return p, nil
+	}
+	if len(src)%2 != 0 {
+		return p, fmt.Errorf("invalid length for polygon: %v", len(src))
+	}
+	p.Valid = true
+	p.P = make([]Vec2, 0)
+	for i := 0; i < len(src); i += 2 {
+		p.P = append(p.P, Vec2{X: src[i], Y: src[i+1]})
+	}
+	return p, nil
+}
+
+func (dst Polygon) Get() interface{} {
+	if !dst.Valid {
+		return nil
+	}
+	return dst
+}
+
+func (src *Polygon) AssignTo(dst interface{}) error {
+	return fmt.Errorf("cannot assign %v to %T", src, dst)
+}
+
+func (dst *Polygon) DecodeText(ci *ConnInfo, src []byte) error {
+	if src == nil {
+		*dst = Polygon{}
+		return nil
+	}
+
+	if len(src) < 7 {
+		return fmt.Errorf("invalid length for Polygon: %v", len(src))
+	}
+
+	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 = Polygon{P: points, Valid: true}
+	return nil
+}
+
+func (dst *Polygon) DecodeBinary(ci *ConnInfo, src []byte) error {
+	if src == nil {
+		*dst = Polygon{}
+		return nil
+	}
+
+	if len(src) < 5 {
+		return fmt.Errorf("invalid length for Polygon: %v", len(src))
+	}
+
+	pointCount := int(binary.BigEndian.Uint32(src))
+	rp := 4
+
+	if 4+pointCount*16 != len(src) {
+		return fmt.Errorf("invalid length for Polygon 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 = Polygon{
+		P:     points,
+		Valid: true,
+	}
+	return nil
+}
+
+func (src Polygon) EncodeText(ci *ConnInfo, buf []byte) ([]byte, error) {
+	if !src.Valid {
+		return nil, nil
+	}
+
+	buf = append(buf, '(')
+
+	for i, p := range src.P {
+		if i > 0 {
+			buf = append(buf, ',')
+		}
+		buf = append(buf, fmt.Sprintf(`(%s,%s)`,
+			strconv.FormatFloat(p.X, 'f', -1, 64),
+			strconv.FormatFloat(p.Y, 'f', -1, 64),
+		)...)
+	}
+
+	return append(buf, ')'), nil
+}
+
+func (src Polygon) EncodeBinary(ci *ConnInfo, buf []byte) ([]byte, error) {
+	if !src.Valid {
+		return nil, nil
+	}
+
+	buf = pgio.AppendInt32(buf, int32(len(src.P)))
+
+	for _, p := range src.P {
+		buf = pgio.AppendUint64(buf, math.Float64bits(p.X))
+		buf = pgio.AppendUint64(buf, math.Float64bits(p.Y))
+	}
+
+	return buf, nil
+}
+
+// Scan implements the database/sql Scanner interface.
+func (dst *Polygon) Scan(src interface{}) error {
+	if src == nil {
+		*dst = Polygon{}
+		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 Polygon) Value() (driver.Value, error) {
+	return EncodeValueText(src)
+}