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 +1,264 @@
+package pgtype
+
+import (
+	"database/sql/driver"
+	"encoding/binary"
+	"encoding/json"
+	"fmt"
+	"time"
+
+	"github.com/jackc/pgio"
+)
+
+type Date struct {
+	Time             time.Time
+	Valid            bool
+	InfinityModifier InfinityModifier
+}
+
+const (
+	negativeInfinityDayOffset = -2147483648
+	infinityDayOffset         = 2147483647
+)
+
+func (dst *Date) Set(src interface{}) error {
+	if src == nil {
+		*dst = Date{}
+		return nil
+	}
+
+	if value, ok := src.(interface{ Get() interface{} }); ok {
+		value2 := value.Get()
+		if value2 != value {
+			return dst.Set(value2)
+		}
+	}
+
+	switch value := src.(type) {
+	case time.Time:
+		*dst = Date{Time: value, Valid: true}
+	case string:
+		return dst.DecodeText(nil, []byte(value))
+	case *time.Time:
+		if value == nil {
+			*dst = Date{}
+		} else {
+			return dst.Set(*value)
+		}
+	case *string:
+		if value == nil {
+			*dst = Date{}
+		} else {
+			return dst.Set(*value)
+		}
+	default:
+		if originalSrc, ok := underlyingTimeType(src); ok {
+			return dst.Set(originalSrc)
+		}
+		return fmt.Errorf("cannot convert %v to Date", value)
+	}
+
+	return nil
+}
+
+func (dst Date) Get() interface{} {
+	if !dst.Valid {
+		return nil
+	}
+	if dst.InfinityModifier != None {
+		return dst.InfinityModifier
+	}
+	return dst.Time
+}
+
+func (src *Date) AssignTo(dst interface{}) error {
+	if !src.Valid {
+		return NullAssignTo(dst)
+	}
+
+	switch v := dst.(type) {
+	case *time.Time:
+		if src.InfinityModifier != None {
+			return fmt.Errorf("cannot assign %v to %T", src, dst)
+		}
+		*v = src.Time
+		return nil
+	default:
+		if nextDst, retry := GetAssignToDstType(dst); retry {
+			return src.AssignTo(nextDst)
+		}
+		return fmt.Errorf("unable to assign to %T", dst)
+	}
+}
+
+func (dst *Date) DecodeText(ci *ConnInfo, src []byte) error {
+	if src == nil {
+		*dst = Date{}
+		return nil
+	}
+
+	sbuf := string(src)
+	switch sbuf {
+	case "infinity":
+		*dst = Date{Valid: true, InfinityModifier: Infinity}
+	case "-infinity":
+		*dst = Date{Valid: true, InfinityModifier: -Infinity}
+	default:
+		t, err := time.ParseInLocation("2006-01-02", sbuf, time.UTC)
+		if err != nil {
+			return err
+		}
+
+		*dst = Date{Time: t, Valid: true}
+	}
+
+	return nil
+}
+
+func (dst *Date) DecodeBinary(ci *ConnInfo, src []byte) error {
+	if src == nil {
+		*dst = Date{}
+		return nil
+	}
+
+	if len(src) != 4 {
+		return fmt.Errorf("invalid length for date: %v", len(src))
+	}
+
+	dayOffset := int32(binary.BigEndian.Uint32(src))
+
+	switch dayOffset {
+	case infinityDayOffset:
+		*dst = Date{Valid: true, InfinityModifier: Infinity}
+	case negativeInfinityDayOffset:
+		*dst = Date{Valid: true, InfinityModifier: -Infinity}
+	default:
+		t := time.Date(2000, 1, int(1+dayOffset), 0, 0, 0, 0, time.UTC)
+		*dst = Date{Time: t, Valid: true}
+	}
+
+	return nil
+}
+
+func (src Date) EncodeText(ci *ConnInfo, buf []byte) ([]byte, error) {
+	if !src.Valid {
+		return nil, nil
+	}
+
+	var s string
+
+	switch src.InfinityModifier {
+	case None:
+		s = src.Time.Format("2006-01-02")
+	case Infinity:
+		s = "infinity"
+	case NegativeInfinity:
+		s = "-infinity"
+	}
+
+	return append(buf, s...), nil
+}
+
+func (src Date) EncodeBinary(ci *ConnInfo, buf []byte) ([]byte, error) {
+	if !src.Valid {
+		return nil, nil
+	}
+
+	var daysSinceDateEpoch int32
+	switch src.InfinityModifier {
+	case None:
+		tUnix := time.Date(src.Time.Year(), src.Time.Month(), src.Time.Day(), 0, 0, 0, 0, time.UTC).Unix()
+		dateEpoch := time.Date(2000, 1, 1, 0, 0, 0, 0, time.UTC).Unix()
+
+		secSinceDateEpoch := tUnix - dateEpoch
+		daysSinceDateEpoch = int32(secSinceDateEpoch / 86400)
+	case Infinity:
+		daysSinceDateEpoch = infinityDayOffset
+	case NegativeInfinity:
+		daysSinceDateEpoch = negativeInfinityDayOffset
+	}
+
+	return pgio.AppendInt32(buf, daysSinceDateEpoch), nil
+}
+
+// Scan implements the database/sql Scanner interface.
+func (dst *Date) Scan(src interface{}) error {
+	if src == nil {
+		*dst = Date{}
+		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)
+	case time.Time:
+		*dst = Date{Time: src, Valid: true}
+		return nil
+	}
+
+	return fmt.Errorf("cannot scan %T", src)
+}
+
+// Value implements the database/sql/driver Valuer interface.
+func (src Date) Value() (driver.Value, error) {
+	if !src.Valid {
+		return nil, nil
+	}
+
+	if src.InfinityModifier != None {
+		return src.InfinityModifier.String(), nil
+	}
+	return src.Time, nil
+}
+
+func (src Date) MarshalJSON() ([]byte, error) {
+	if !src.Valid {
+		return []byte("null"), nil
+	}
+
+	var s string
+
+	switch src.InfinityModifier {
+	case None:
+		s = src.Time.Format("2006-01-02")
+	case Infinity:
+		s = "infinity"
+	case NegativeInfinity:
+		s = "-infinity"
+	}
+
+	return json.Marshal(s)
+}
+
+func (dst *Date) UnmarshalJSON(b []byte) error {
+	var s *string
+	err := json.Unmarshal(b, &s)
+	if err != nil {
+		return err
+	}
+
+	if s == nil {
+		*dst = Date{}
+		return nil
+	}
+
+	switch *s {
+	case "infinity":
+		*dst = Date{Valid: true, InfinityModifier: Infinity}
+	case "-infinity":
+		*dst = Date{Valid: true, InfinityModifier: -Infinity}
+	default:
+		t, err := time.ParseInLocation("2006-01-02", *s, time.UTC)
+		if err != nil {
+			return err
+		}
+
+		*dst = Date{Time: t, Valid: true}
+	}
+
+	return nil
+}