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Copy pathpath.go
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195 lines (159 loc) · 3.55 KB
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Copy pathpath.go
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195 lines (159 loc) · 3.55 KB
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package pgtype
import (
"database/sql/driver"
"encoding/binary"
"fmt"
"math"
"strconv"
"strings"
"github.com/jackc/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, buf []byte) ([]byte, error) {
switch src.Status {
case Null:
return nil, nil
case Undefined:
return nil, errUndefined
}
var startByte, endByte byte
if src.Closed {
startByte = '('
endByte = ')'
} else {
startByte = '['
endByte = ']'
}
buf = append(buf, startByte)
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, endByte), nil
}
func (src Path) EncodeBinary(ci *ConnInfo, buf []byte) ([]byte, error) {
switch src.Status {
case Null:
return nil, nil
case Undefined:
return nil, errUndefined
}
var closeByte byte
if src.Closed {
closeByte = 1
}
buf = append(buf, closeByte)
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 *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:
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 Path) Value() (driver.Value, error) {
return EncodeValueText(src)
}