mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-05-20 17:28:40 +00:00
a156188b3e
* update dependencies, bump Go version to 1.19 * bump test image Go version * update golangci-lint * update gotosocial-drone-build * sign * linting, go fmt * update swagger docs * update swagger docs * whitespace * update contributing.md * fuckin whoopsie doopsie * linterino, linteroni * fix followrequest test not starting processor * fix other api/client tests not starting processor * fix remaining tests where processor not started * bump go-runners version * don't check last-webfingered-at, processor may have updated this * update swagger command * update bun to latest version * fix embed to work the same as before with new bun Signed-off-by: kim <grufwub@gmail.com> Co-authored-by: tsmethurst <tobi.smethurst@protonmail.com>
854 lines
20 KiB
Go
854 lines
20 KiB
Go
package pgtype
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import (
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"bytes"
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"database/sql/driver"
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"encoding/binary"
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"fmt"
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"math"
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"math/big"
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"strconv"
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"strings"
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"github.com/jackc/pgio"
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)
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// PostgreSQL internal numeric storage uses 16-bit "digits" with base of 10,000
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const nbase = 10000
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const (
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pgNumericNaN = 0x00000000c0000000
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pgNumericNaNSign = 0xc000
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pgNumericPosInf = 0x00000000d0000000
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pgNumericPosInfSign = 0xd000
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pgNumericNegInf = 0x00000000f0000000
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pgNumericNegInfSign = 0xf000
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)
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var big0 *big.Int = big.NewInt(0)
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var big1 *big.Int = big.NewInt(1)
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var big10 *big.Int = big.NewInt(10)
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var big100 *big.Int = big.NewInt(100)
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var big1000 *big.Int = big.NewInt(1000)
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var bigMaxInt8 *big.Int = big.NewInt(math.MaxInt8)
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var bigMinInt8 *big.Int = big.NewInt(math.MinInt8)
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var bigMaxInt16 *big.Int = big.NewInt(math.MaxInt16)
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var bigMinInt16 *big.Int = big.NewInt(math.MinInt16)
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var bigMaxInt32 *big.Int = big.NewInt(math.MaxInt32)
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var bigMinInt32 *big.Int = big.NewInt(math.MinInt32)
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var bigMaxInt64 *big.Int = big.NewInt(math.MaxInt64)
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var bigMinInt64 *big.Int = big.NewInt(math.MinInt64)
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var bigMaxInt *big.Int = big.NewInt(int64(maxInt))
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var bigMinInt *big.Int = big.NewInt(int64(minInt))
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var bigMaxUint8 *big.Int = big.NewInt(math.MaxUint8)
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var bigMaxUint16 *big.Int = big.NewInt(math.MaxUint16)
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var bigMaxUint32 *big.Int = big.NewInt(math.MaxUint32)
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var bigMaxUint64 *big.Int = (&big.Int{}).SetUint64(uint64(math.MaxUint64))
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var bigMaxUint *big.Int = (&big.Int{}).SetUint64(uint64(maxUint))
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var bigNBase *big.Int = big.NewInt(nbase)
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var bigNBaseX2 *big.Int = big.NewInt(nbase * nbase)
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var bigNBaseX3 *big.Int = big.NewInt(nbase * nbase * nbase)
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var bigNBaseX4 *big.Int = big.NewInt(nbase * nbase * nbase * nbase)
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type Numeric struct {
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Int *big.Int
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Exp int32
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Status Status
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NaN bool
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InfinityModifier InfinityModifier
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}
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func (dst *Numeric) Set(src interface{}) error {
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if src == nil {
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*dst = Numeric{Status: Null}
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return nil
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}
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if value, ok := src.(interface{ Get() interface{} }); ok {
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value2 := value.Get()
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if value2 != value {
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return dst.Set(value2)
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}
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}
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switch value := src.(type) {
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case float32:
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if math.IsNaN(float64(value)) {
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*dst = Numeric{Status: Present, NaN: true}
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return nil
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} else if math.IsInf(float64(value), 1) {
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*dst = Numeric{Status: Present, InfinityModifier: Infinity}
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return nil
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} else if math.IsInf(float64(value), -1) {
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*dst = Numeric{Status: Present, InfinityModifier: NegativeInfinity}
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return nil
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}
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num, exp, err := parseNumericString(strconv.FormatFloat(float64(value), 'f', -1, 64))
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if err != nil {
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return err
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}
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*dst = Numeric{Int: num, Exp: exp, Status: Present}
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case float64:
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if math.IsNaN(value) {
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*dst = Numeric{Status: Present, NaN: true}
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return nil
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} else if math.IsInf(value, 1) {
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*dst = Numeric{Status: Present, InfinityModifier: Infinity}
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return nil
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} else if math.IsInf(value, -1) {
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*dst = Numeric{Status: Present, InfinityModifier: NegativeInfinity}
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return nil
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}
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num, exp, err := parseNumericString(strconv.FormatFloat(value, 'f', -1, 64))
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if err != nil {
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return err
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}
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*dst = Numeric{Int: num, Exp: exp, Status: Present}
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case int8:
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*dst = Numeric{Int: big.NewInt(int64(value)), Status: Present}
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case uint8:
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*dst = Numeric{Int: big.NewInt(int64(value)), Status: Present}
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case int16:
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*dst = Numeric{Int: big.NewInt(int64(value)), Status: Present}
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case uint16:
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*dst = Numeric{Int: big.NewInt(int64(value)), Status: Present}
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case int32:
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*dst = Numeric{Int: big.NewInt(int64(value)), Status: Present}
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case uint32:
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*dst = Numeric{Int: big.NewInt(int64(value)), Status: Present}
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case int64:
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*dst = Numeric{Int: big.NewInt(value), Status: Present}
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case uint64:
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*dst = Numeric{Int: (&big.Int{}).SetUint64(value), Status: Present}
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case int:
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*dst = Numeric{Int: big.NewInt(int64(value)), Status: Present}
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case uint:
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*dst = Numeric{Int: (&big.Int{}).SetUint64(uint64(value)), Status: Present}
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case string:
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num, exp, err := parseNumericString(value)
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if err != nil {
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return err
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}
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*dst = Numeric{Int: num, Exp: exp, Status: Present}
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case *float64:
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if value == nil {
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*dst = Numeric{Status: Null}
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} else {
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return dst.Set(*value)
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}
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case *float32:
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if value == nil {
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*dst = Numeric{Status: Null}
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} else {
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return dst.Set(*value)
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}
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case *int8:
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if value == nil {
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*dst = Numeric{Status: Null}
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} else {
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return dst.Set(*value)
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}
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case *uint8:
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if value == nil {
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*dst = Numeric{Status: Null}
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} else {
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return dst.Set(*value)
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}
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case *int16:
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if value == nil {
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*dst = Numeric{Status: Null}
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} else {
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return dst.Set(*value)
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}
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case *uint16:
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if value == nil {
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*dst = Numeric{Status: Null}
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} else {
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return dst.Set(*value)
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}
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case *int32:
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if value == nil {
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*dst = Numeric{Status: Null}
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} else {
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return dst.Set(*value)
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}
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case *uint32:
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if value == nil {
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*dst = Numeric{Status: Null}
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} else {
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return dst.Set(*value)
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}
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case *int64:
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if value == nil {
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*dst = Numeric{Status: Null}
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} else {
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return dst.Set(*value)
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}
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case *uint64:
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if value == nil {
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*dst = Numeric{Status: Null}
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} else {
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return dst.Set(*value)
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}
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case *int:
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if value == nil {
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*dst = Numeric{Status: Null}
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} else {
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return dst.Set(*value)
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}
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case *uint:
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if value == nil {
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*dst = Numeric{Status: Null}
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} else {
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return dst.Set(*value)
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}
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case *string:
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if value == nil {
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*dst = Numeric{Status: Null}
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} else {
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return dst.Set(*value)
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}
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case InfinityModifier:
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*dst = Numeric{InfinityModifier: value, Status: Present}
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default:
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if originalSrc, ok := underlyingNumberType(src); ok {
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return dst.Set(originalSrc)
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}
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return fmt.Errorf("cannot convert %v to Numeric", value)
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}
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return nil
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}
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func (dst Numeric) Get() interface{} {
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switch dst.Status {
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case Present:
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if dst.InfinityModifier != None {
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return dst.InfinityModifier
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}
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return dst
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case Null:
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return nil
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default:
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return dst.Status
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}
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}
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func (src *Numeric) AssignTo(dst interface{}) error {
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switch src.Status {
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case Present:
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switch v := dst.(type) {
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case *float32:
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f, err := src.toFloat64()
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if err != nil {
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return err
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}
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return float64AssignTo(f, src.Status, dst)
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case *float64:
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f, err := src.toFloat64()
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if err != nil {
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return err
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}
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return float64AssignTo(f, src.Status, dst)
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case *int:
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normalizedInt, err := src.toBigInt()
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if err != nil {
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return err
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}
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if normalizedInt.Cmp(bigMaxInt) > 0 {
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return fmt.Errorf("%v is greater than maximum value for %T", normalizedInt, *v)
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}
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if normalizedInt.Cmp(bigMinInt) < 0 {
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return fmt.Errorf("%v is less than minimum value for %T", normalizedInt, *v)
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}
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*v = int(normalizedInt.Int64())
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case *int8:
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normalizedInt, err := src.toBigInt()
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if err != nil {
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return err
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}
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if normalizedInt.Cmp(bigMaxInt8) > 0 {
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return fmt.Errorf("%v is greater than maximum value for %T", normalizedInt, *v)
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}
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if normalizedInt.Cmp(bigMinInt8) < 0 {
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return fmt.Errorf("%v is less than minimum value for %T", normalizedInt, *v)
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}
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*v = int8(normalizedInt.Int64())
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case *int16:
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normalizedInt, err := src.toBigInt()
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if err != nil {
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return err
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}
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if normalizedInt.Cmp(bigMaxInt16) > 0 {
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return fmt.Errorf("%v is greater than maximum value for %T", normalizedInt, *v)
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}
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if normalizedInt.Cmp(bigMinInt16) < 0 {
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return fmt.Errorf("%v is less than minimum value for %T", normalizedInt, *v)
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}
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*v = int16(normalizedInt.Int64())
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case *int32:
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normalizedInt, err := src.toBigInt()
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if err != nil {
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return err
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}
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if normalizedInt.Cmp(bigMaxInt32) > 0 {
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return fmt.Errorf("%v is greater than maximum value for %T", normalizedInt, *v)
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}
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if normalizedInt.Cmp(bigMinInt32) < 0 {
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return fmt.Errorf("%v is less than minimum value for %T", normalizedInt, *v)
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}
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*v = int32(normalizedInt.Int64())
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case *int64:
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normalizedInt, err := src.toBigInt()
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if err != nil {
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return err
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}
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if normalizedInt.Cmp(bigMaxInt64) > 0 {
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return fmt.Errorf("%v is greater than maximum value for %T", normalizedInt, *v)
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}
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if normalizedInt.Cmp(bigMinInt64) < 0 {
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return fmt.Errorf("%v is less than minimum value for %T", normalizedInt, *v)
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}
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*v = normalizedInt.Int64()
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case *uint:
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normalizedInt, err := src.toBigInt()
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if err != nil {
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return err
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}
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if normalizedInt.Cmp(big0) < 0 {
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return fmt.Errorf("%d is less than zero for %T", normalizedInt, *v)
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} else if normalizedInt.Cmp(bigMaxUint) > 0 {
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return fmt.Errorf("%d is greater than maximum value for %T", normalizedInt, *v)
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}
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*v = uint(normalizedInt.Uint64())
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case *uint8:
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normalizedInt, err := src.toBigInt()
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if err != nil {
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return err
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}
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if normalizedInt.Cmp(big0) < 0 {
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return fmt.Errorf("%d is less than zero for %T", normalizedInt, *v)
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} else if normalizedInt.Cmp(bigMaxUint8) > 0 {
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return fmt.Errorf("%d is greater than maximum value for %T", normalizedInt, *v)
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}
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*v = uint8(normalizedInt.Uint64())
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case *uint16:
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normalizedInt, err := src.toBigInt()
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if err != nil {
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return err
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}
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if normalizedInt.Cmp(big0) < 0 {
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return fmt.Errorf("%d is less than zero for %T", normalizedInt, *v)
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} else if normalizedInt.Cmp(bigMaxUint16) > 0 {
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return fmt.Errorf("%d is greater than maximum value for %T", normalizedInt, *v)
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}
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*v = uint16(normalizedInt.Uint64())
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case *uint32:
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normalizedInt, err := src.toBigInt()
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if err != nil {
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return err
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}
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if normalizedInt.Cmp(big0) < 0 {
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return fmt.Errorf("%d is less than zero for %T", normalizedInt, *v)
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} else if normalizedInt.Cmp(bigMaxUint32) > 0 {
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return fmt.Errorf("%d is greater than maximum value for %T", normalizedInt, *v)
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}
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*v = uint32(normalizedInt.Uint64())
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case *uint64:
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normalizedInt, err := src.toBigInt()
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if err != nil {
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return err
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}
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if normalizedInt.Cmp(big0) < 0 {
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return fmt.Errorf("%d is less than zero for %T", normalizedInt, *v)
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} else if normalizedInt.Cmp(bigMaxUint64) > 0 {
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return fmt.Errorf("%d is greater than maximum value for %T", normalizedInt, *v)
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}
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*v = normalizedInt.Uint64()
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case *big.Rat:
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rat, err := src.toBigRat()
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if err != nil {
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return err
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}
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v.Set(rat)
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case *string:
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buf, err := encodeNumericText(*src, nil)
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if err != nil {
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return err
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}
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*v = string(buf)
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default:
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if nextDst, retry := GetAssignToDstType(dst); retry {
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return src.AssignTo(nextDst)
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}
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return fmt.Errorf("unable to assign to %T", dst)
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}
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case Null:
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return NullAssignTo(dst)
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}
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return nil
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}
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func (dst *Numeric) toBigInt() (*big.Int, error) {
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if dst.Exp == 0 {
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return dst.Int, nil
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}
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num := &big.Int{}
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num.Set(dst.Int)
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if dst.Exp > 0 {
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mul := &big.Int{}
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mul.Exp(big10, big.NewInt(int64(dst.Exp)), nil)
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num.Mul(num, mul)
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return num, nil
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}
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div := &big.Int{}
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div.Exp(big10, big.NewInt(int64(-dst.Exp)), nil)
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remainder := &big.Int{}
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num.DivMod(num, div, remainder)
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if remainder.Cmp(big0) != 0 {
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return nil, fmt.Errorf("cannot convert %v to integer", dst)
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}
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return num, nil
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}
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func (dst *Numeric) toBigRat() (*big.Rat, error) {
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if dst.NaN {
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return nil, fmt.Errorf("%v is not a number", dst)
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} else if dst.InfinityModifier == Infinity {
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return nil, fmt.Errorf("%v is infinity", dst)
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} else if dst.InfinityModifier == NegativeInfinity {
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return nil, fmt.Errorf("%v is -infinity", dst)
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}
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num := new(big.Rat).SetInt(dst.Int)
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if dst.Exp > 0 {
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mul := new(big.Int).Exp(big10, big.NewInt(int64(dst.Exp)), nil)
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num.Mul(num, new(big.Rat).SetInt(mul))
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} else if dst.Exp < 0 {
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mul := new(big.Int).Exp(big10, big.NewInt(int64(-dst.Exp)), nil)
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num.Quo(num, new(big.Rat).SetInt(mul))
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}
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return num, nil
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}
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func (src *Numeric) toFloat64() (float64, error) {
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if src.NaN {
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return math.NaN(), nil
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} else if src.InfinityModifier == Infinity {
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return math.Inf(1), nil
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} else if src.InfinityModifier == NegativeInfinity {
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return math.Inf(-1), nil
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}
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buf := make([]byte, 0, 32)
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buf = append(buf, src.Int.String()...)
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buf = append(buf, 'e')
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buf = append(buf, strconv.FormatInt(int64(src.Exp), 10)...)
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f, err := strconv.ParseFloat(string(buf), 64)
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if err != nil {
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return 0, err
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}
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return f, nil
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}
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func (dst *Numeric) DecodeText(ci *ConnInfo, src []byte) error {
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if src == nil {
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*dst = Numeric{Status: Null}
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return nil
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}
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if string(src) == "NaN" {
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*dst = Numeric{Status: Present, NaN: true}
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return nil
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} else if string(src) == "Infinity" {
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*dst = Numeric{Status: Present, InfinityModifier: Infinity}
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return nil
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} else if string(src) == "-Infinity" {
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*dst = Numeric{Status: Present, InfinityModifier: NegativeInfinity}
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return nil
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}
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num, exp, err := parseNumericString(string(src))
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if err != nil {
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return err
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}
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*dst = Numeric{Int: num, Exp: exp, Status: Present}
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return nil
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}
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func parseNumericString(str string) (n *big.Int, exp int32, err error) {
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parts := strings.SplitN(str, ".", 2)
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digits := strings.Join(parts, "")
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if len(parts) > 1 {
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exp = int32(-len(parts[1]))
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} else {
|
|
for len(digits) > 1 && digits[len(digits)-1] == '0' && digits[len(digits)-2] != '-' {
|
|
digits = digits[:len(digits)-1]
|
|
exp++
|
|
}
|
|
}
|
|
|
|
accum := &big.Int{}
|
|
if _, ok := accum.SetString(digits, 10); !ok {
|
|
return nil, 0, fmt.Errorf("%s is not a number", str)
|
|
}
|
|
|
|
return accum, exp, nil
|
|
}
|
|
|
|
func (dst *Numeric) DecodeBinary(ci *ConnInfo, src []byte) error {
|
|
if src == nil {
|
|
*dst = Numeric{Status: Null}
|
|
return nil
|
|
}
|
|
|
|
if len(src) < 8 {
|
|
return fmt.Errorf("numeric incomplete %v", src)
|
|
}
|
|
|
|
rp := 0
|
|
ndigits := binary.BigEndian.Uint16(src[rp:])
|
|
rp += 2
|
|
weight := int16(binary.BigEndian.Uint16(src[rp:]))
|
|
rp += 2
|
|
sign := binary.BigEndian.Uint16(src[rp:])
|
|
rp += 2
|
|
dscale := int16(binary.BigEndian.Uint16(src[rp:]))
|
|
rp += 2
|
|
|
|
if sign == pgNumericNaNSign {
|
|
*dst = Numeric{Status: Present, NaN: true}
|
|
return nil
|
|
} else if sign == pgNumericPosInfSign {
|
|
*dst = Numeric{Status: Present, InfinityModifier: Infinity}
|
|
return nil
|
|
} else if sign == pgNumericNegInfSign {
|
|
*dst = Numeric{Status: Present, InfinityModifier: NegativeInfinity}
|
|
return nil
|
|
}
|
|
|
|
if ndigits == 0 {
|
|
*dst = Numeric{Int: big.NewInt(0), Status: Present}
|
|
return nil
|
|
}
|
|
|
|
if len(src[rp:]) < int(ndigits)*2 {
|
|
return fmt.Errorf("numeric incomplete %v", src)
|
|
}
|
|
|
|
accum := &big.Int{}
|
|
|
|
for i := 0; i < int(ndigits+3)/4; i++ {
|
|
int64accum, bytesRead, digitsRead := nbaseDigitsToInt64(src[rp:])
|
|
rp += bytesRead
|
|
|
|
if i > 0 {
|
|
var mul *big.Int
|
|
switch digitsRead {
|
|
case 1:
|
|
mul = bigNBase
|
|
case 2:
|
|
mul = bigNBaseX2
|
|
case 3:
|
|
mul = bigNBaseX3
|
|
case 4:
|
|
mul = bigNBaseX4
|
|
default:
|
|
return fmt.Errorf("invalid digitsRead: %d (this can't happen)", digitsRead)
|
|
}
|
|
accum.Mul(accum, mul)
|
|
}
|
|
|
|
accum.Add(accum, big.NewInt(int64accum))
|
|
}
|
|
|
|
exp := (int32(weight) - int32(ndigits) + 1) * 4
|
|
|
|
if dscale > 0 {
|
|
fracNBaseDigits := int16(int32(ndigits) - int32(weight) - 1)
|
|
fracDecimalDigits := fracNBaseDigits * 4
|
|
|
|
if dscale > fracDecimalDigits {
|
|
multCount := int(dscale - fracDecimalDigits)
|
|
for i := 0; i < multCount; i++ {
|
|
accum.Mul(accum, big10)
|
|
exp--
|
|
}
|
|
} else if dscale < fracDecimalDigits {
|
|
divCount := int(fracDecimalDigits - dscale)
|
|
for i := 0; i < divCount; i++ {
|
|
accum.Div(accum, big10)
|
|
exp++
|
|
}
|
|
}
|
|
}
|
|
|
|
reduced := &big.Int{}
|
|
remainder := &big.Int{}
|
|
if exp >= 0 {
|
|
for {
|
|
reduced.DivMod(accum, big10, remainder)
|
|
if remainder.Cmp(big0) != 0 {
|
|
break
|
|
}
|
|
accum.Set(reduced)
|
|
exp++
|
|
}
|
|
}
|
|
|
|
if sign != 0 {
|
|
accum.Neg(accum)
|
|
}
|
|
|
|
*dst = Numeric{Int: accum, Exp: exp, Status: Present}
|
|
|
|
return nil
|
|
|
|
}
|
|
|
|
func nbaseDigitsToInt64(src []byte) (accum int64, bytesRead, digitsRead int) {
|
|
digits := len(src) / 2
|
|
if digits > 4 {
|
|
digits = 4
|
|
}
|
|
|
|
rp := 0
|
|
|
|
for i := 0; i < digits; i++ {
|
|
if i > 0 {
|
|
accum *= nbase
|
|
}
|
|
accum += int64(binary.BigEndian.Uint16(src[rp:]))
|
|
rp += 2
|
|
}
|
|
|
|
return accum, rp, digits
|
|
}
|
|
|
|
func (src Numeric) EncodeText(ci *ConnInfo, buf []byte) ([]byte, error) {
|
|
switch src.Status {
|
|
case Null:
|
|
return nil, nil
|
|
case Undefined:
|
|
return nil, errUndefined
|
|
}
|
|
|
|
if src.NaN {
|
|
buf = append(buf, "NaN"...)
|
|
return buf, nil
|
|
} else if src.InfinityModifier == Infinity {
|
|
buf = append(buf, "Infinity"...)
|
|
return buf, nil
|
|
} else if src.InfinityModifier == NegativeInfinity {
|
|
buf = append(buf, "-Infinity"...)
|
|
return buf, nil
|
|
}
|
|
|
|
buf = append(buf, src.Int.String()...)
|
|
buf = append(buf, 'e')
|
|
buf = append(buf, strconv.FormatInt(int64(src.Exp), 10)...)
|
|
return buf, nil
|
|
}
|
|
|
|
func (src Numeric) EncodeBinary(ci *ConnInfo, buf []byte) ([]byte, error) {
|
|
switch src.Status {
|
|
case Null:
|
|
return nil, nil
|
|
case Undefined:
|
|
return nil, errUndefined
|
|
}
|
|
|
|
if src.NaN {
|
|
buf = pgio.AppendUint64(buf, pgNumericNaN)
|
|
return buf, nil
|
|
} else if src.InfinityModifier == Infinity {
|
|
buf = pgio.AppendUint64(buf, pgNumericPosInf)
|
|
return buf, nil
|
|
} else if src.InfinityModifier == NegativeInfinity {
|
|
buf = pgio.AppendUint64(buf, pgNumericNegInf)
|
|
return buf, nil
|
|
}
|
|
|
|
var sign int16
|
|
if src.Int.Cmp(big0) < 0 {
|
|
sign = 16384
|
|
}
|
|
|
|
absInt := &big.Int{}
|
|
wholePart := &big.Int{}
|
|
fracPart := &big.Int{}
|
|
remainder := &big.Int{}
|
|
absInt.Abs(src.Int)
|
|
|
|
// Normalize absInt and exp to where exp is always a multiple of 4. This makes
|
|
// converting to 16-bit base 10,000 digits easier.
|
|
var exp int32
|
|
switch src.Exp % 4 {
|
|
case 1, -3:
|
|
exp = src.Exp - 1
|
|
absInt.Mul(absInt, big10)
|
|
case 2, -2:
|
|
exp = src.Exp - 2
|
|
absInt.Mul(absInt, big100)
|
|
case 3, -1:
|
|
exp = src.Exp - 3
|
|
absInt.Mul(absInt, big1000)
|
|
default:
|
|
exp = src.Exp
|
|
}
|
|
|
|
if exp < 0 {
|
|
divisor := &big.Int{}
|
|
divisor.Exp(big10, big.NewInt(int64(-exp)), nil)
|
|
wholePart.DivMod(absInt, divisor, fracPart)
|
|
fracPart.Add(fracPart, divisor)
|
|
} else {
|
|
wholePart = absInt
|
|
}
|
|
|
|
var wholeDigits, fracDigits []int16
|
|
|
|
for wholePart.Cmp(big0) != 0 {
|
|
wholePart.DivMod(wholePart, bigNBase, remainder)
|
|
wholeDigits = append(wholeDigits, int16(remainder.Int64()))
|
|
}
|
|
|
|
if fracPart.Cmp(big0) != 0 {
|
|
for fracPart.Cmp(big1) != 0 {
|
|
fracPart.DivMod(fracPart, bigNBase, remainder)
|
|
fracDigits = append(fracDigits, int16(remainder.Int64()))
|
|
}
|
|
}
|
|
|
|
buf = pgio.AppendInt16(buf, int16(len(wholeDigits)+len(fracDigits)))
|
|
|
|
var weight int16
|
|
if len(wholeDigits) > 0 {
|
|
weight = int16(len(wholeDigits) - 1)
|
|
if exp > 0 {
|
|
weight += int16(exp / 4)
|
|
}
|
|
} else {
|
|
weight = int16(exp/4) - 1 + int16(len(fracDigits))
|
|
}
|
|
buf = pgio.AppendInt16(buf, weight)
|
|
|
|
buf = pgio.AppendInt16(buf, sign)
|
|
|
|
var dscale int16
|
|
if src.Exp < 0 {
|
|
dscale = int16(-src.Exp)
|
|
}
|
|
buf = pgio.AppendInt16(buf, dscale)
|
|
|
|
for i := len(wholeDigits) - 1; i >= 0; i-- {
|
|
buf = pgio.AppendInt16(buf, wholeDigits[i])
|
|
}
|
|
|
|
for i := len(fracDigits) - 1; i >= 0; i-- {
|
|
buf = pgio.AppendInt16(buf, fracDigits[i])
|
|
}
|
|
|
|
return buf, nil
|
|
}
|
|
|
|
// Scan implements the database/sql Scanner interface.
|
|
func (dst *Numeric) Scan(src interface{}) error {
|
|
if src == nil {
|
|
*dst = Numeric{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 Numeric) Value() (driver.Value, error) {
|
|
switch src.Status {
|
|
case Present:
|
|
buf, err := src.EncodeText(nil, nil)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return string(buf), nil
|
|
case Null:
|
|
return nil, nil
|
|
default:
|
|
return nil, errUndefined
|
|
}
|
|
}
|
|
|
|
func encodeNumericText(n Numeric, buf []byte) (newBuf []byte, err error) {
|
|
// if !n.Valid {
|
|
// return nil, nil
|
|
// }
|
|
|
|
if n.NaN {
|
|
buf = append(buf, "NaN"...)
|
|
return buf, nil
|
|
} else if n.InfinityModifier == Infinity {
|
|
buf = append(buf, "Infinity"...)
|
|
return buf, nil
|
|
} else if n.InfinityModifier == NegativeInfinity {
|
|
buf = append(buf, "-Infinity"...)
|
|
return buf, nil
|
|
}
|
|
|
|
buf = append(buf, n.numberTextBytes()...)
|
|
|
|
return buf, nil
|
|
}
|
|
|
|
// numberString returns a string of the number. undefined if NaN, infinite, or NULL
|
|
func (n Numeric) numberTextBytes() []byte {
|
|
intStr := n.Int.String()
|
|
buf := &bytes.Buffer{}
|
|
exp := int(n.Exp)
|
|
if exp > 0 {
|
|
buf.WriteString(intStr)
|
|
for i := 0; i < exp; i++ {
|
|
buf.WriteByte('0')
|
|
}
|
|
} else if exp < 0 {
|
|
if len(intStr) <= -exp {
|
|
buf.WriteString("0.")
|
|
leadingZeros := -exp - len(intStr)
|
|
for i := 0; i < leadingZeros; i++ {
|
|
buf.WriteByte('0')
|
|
}
|
|
buf.WriteString(intStr)
|
|
} else if len(intStr) > -exp {
|
|
dpPos := len(intStr) + exp
|
|
buf.WriteString(intStr[:dpPos])
|
|
buf.WriteByte('.')
|
|
buf.WriteString(intStr[dpPos:])
|
|
}
|
|
} else {
|
|
buf.WriteString(intStr)
|
|
}
|
|
|
|
return buf.Bytes()
|
|
}
|