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box.go
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239 lines (188 loc) · 4.81 KB
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package pgtype
import (
"database/sql/driver"
"encoding/binary"
"fmt"
"math"
"strconv"
"strings"
"github.com/jackc/pgx/v5/internal/pgio"
)
type BoxScanner interface {
ScanBox(v Box) error
}
type BoxValuer interface {
BoxValue() (Box, error)
}
type Box struct {
P [2]Vec2
Valid bool
}
// ScanBox implements the [BoxScanner] interface.
func (b *Box) ScanBox(v Box) error {
*b = v
return nil
}
// BoxValue implements the [BoxValuer] interface.
func (b Box) BoxValue() (Box, error) {
return b, nil
}
// Scan implements the [database/sql.Scanner] interface.
func (dst *Box) Scan(src any) error {
if src == nil {
*dst = Box{}
return nil
}
switch src := src.(type) {
case string:
return scanPlanTextAnyToBoxScanner{}.Scan([]byte(src), dst)
}
return fmt.Errorf("cannot scan %T", src)
}
// Value implements the [database/sql/driver.Valuer] interface.
func (src Box) Value() (driver.Value, error) {
if !src.Valid {
return nil, nil
}
buf, err := BoxCodec{}.PlanEncode(nil, 0, TextFormatCode, src).Encode(src, nil)
if err != nil {
return nil, err
}
return string(buf), err
}
type BoxCodec struct{}
func (BoxCodec) FormatSupported(format int16) bool {
return format == TextFormatCode || format == BinaryFormatCode
}
func (BoxCodec) PreferredFormat() int16 {
return BinaryFormatCode
}
func (BoxCodec) PlanEncode(m *Map, oid uint32, format int16, value any) EncodePlan {
if _, ok := value.(BoxValuer); !ok {
return nil
}
switch format {
case BinaryFormatCode:
return encodePlanBoxCodecBinary{}
case TextFormatCode:
return encodePlanBoxCodecText{}
}
return nil
}
type encodePlanBoxCodecBinary struct{}
func (encodePlanBoxCodecBinary) Encode(value any, buf []byte) (newBuf []byte, err error) {
box, err := value.(BoxValuer).BoxValue()
if err != nil {
return nil, err
}
if !box.Valid {
return nil, nil
}
buf = pgio.AppendUint64(buf, math.Float64bits(box.P[0].X))
buf = pgio.AppendUint64(buf, math.Float64bits(box.P[0].Y))
buf = pgio.AppendUint64(buf, math.Float64bits(box.P[1].X))
buf = pgio.AppendUint64(buf, math.Float64bits(box.P[1].Y))
return buf, nil
}
type encodePlanBoxCodecText struct{}
func (encodePlanBoxCodecText) Encode(value any, buf []byte) (newBuf []byte, err error) {
box, err := value.(BoxValuer).BoxValue()
if err != nil {
return nil, err
}
if !box.Valid {
return nil, nil
}
buf = append(buf, fmt.Sprintf(`(%s,%s),(%s,%s)`,
strconv.FormatFloat(box.P[0].X, 'f', -1, 64),
strconv.FormatFloat(box.P[0].Y, 'f', -1, 64),
strconv.FormatFloat(box.P[1].X, 'f', -1, 64),
strconv.FormatFloat(box.P[1].Y, 'f', -1, 64),
)...)
return buf, nil
}
func (BoxCodec) PlanScan(m *Map, oid uint32, format int16, target any) ScanPlan {
switch format {
case BinaryFormatCode:
switch target.(type) {
case BoxScanner:
return scanPlanBinaryBoxToBoxScanner{}
}
case TextFormatCode:
switch target.(type) {
case BoxScanner:
return scanPlanTextAnyToBoxScanner{}
}
}
return nil
}
type scanPlanBinaryBoxToBoxScanner struct{}
func (scanPlanBinaryBoxToBoxScanner) Scan(src []byte, dst any) error {
scanner := (dst).(BoxScanner)
if src == nil {
return scanner.ScanBox(Box{})
}
if len(src) != 32 {
return fmt.Errorf("invalid length for Box: %v", len(src))
}
x1 := binary.BigEndian.Uint64(src)
y1 := binary.BigEndian.Uint64(src[8:])
x2 := binary.BigEndian.Uint64(src[16:])
y2 := binary.BigEndian.Uint64(src[24:])
return scanner.ScanBox(Box{
P: [2]Vec2{
{math.Float64frombits(x1), math.Float64frombits(y1)},
{math.Float64frombits(x2), math.Float64frombits(y2)},
},
Valid: true,
})
}
type scanPlanTextAnyToBoxScanner struct{}
func (scanPlanTextAnyToBoxScanner) Scan(src []byte, dst any) error {
scanner := (dst).(BoxScanner)
if src == nil {
return scanner.ScanBox(Box{})
}
if len(src) < 11 {
return fmt.Errorf("invalid length for Box: %v", len(src))
}
str := string(src[1:])
var end int
end = strings.IndexByte(str, ',')
x1, err := strconv.ParseFloat(str[:end], 64)
if err != nil {
return err
}
str = str[end+1:]
end = strings.IndexByte(str, ')')
y1, err := strconv.ParseFloat(str[:end], 64)
if err != nil {
return err
}
str = str[end+3:]
end = strings.IndexByte(str, ',')
x2, err := strconv.ParseFloat(str[:end], 64)
if err != nil {
return err
}
str = str[end+1 : len(str)-1]
y2, err := strconv.ParseFloat(str, 64)
if err != nil {
return err
}
return scanner.ScanBox(Box{P: [2]Vec2{{x1, y1}, {x2, y2}}, Valid: true})
}
func (c BoxCodec) DecodeDatabaseSQLValue(m *Map, oid uint32, format int16, src []byte) (driver.Value, error) {
return codecDecodeToTextFormat(c, m, oid, format, src)
}
func (c BoxCodec) DecodeValue(m *Map, oid uint32, format int16, src []byte) (any, error) {
if src == nil {
return nil, nil
}
var box Box
err := codecScan(c, m, oid, format, src, &box)
if err != nil {
return nil, err
}
return box, nil
}