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65 lines
1.3 KiB
Go
65 lines
1.3 KiB
Go
package httpsfv
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import (
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"errors"
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"io"
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"math"
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"strconv"
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"strings"
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)
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const maxDecDigit = 3
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// ErrInvalidDecimal is returned when a decimal is invalid.
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var ErrInvalidDecimal = errors.New("the integer portion is larger than 12 digits: invalid decimal")
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// marshalDecimal serializes as defined in
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// https://httpwg.org/specs/rfc9651.html#ser-decimal.
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//
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// TODO(dunglas): add support for decimal float type when one will be available
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// (https://github.com/golang/go/issues/19787)
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func marshalDecimal(b io.StringWriter, d float64) error {
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const TH = 0.001
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rounded := math.RoundToEven(d/TH) * TH
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i, frac := math.Modf(rounded)
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if i < -999999999999 || i > 999999999999 {
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return ErrInvalidDecimal
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}
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if _, err := b.WriteString(strings.TrimRight(strconv.FormatFloat(rounded, 'f', 3, 64), "0")); err != nil {
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return err
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}
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if frac == 0 {
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_, err := b.WriteString("0")
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return err
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}
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return nil
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}
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func parseDecimal(s *scanner, decSepOff int, str string, neg bool) (float64, error) {
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if decSepOff == s.off-1 {
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return 0, &UnmarshalError{s.off, ErrInvalidDecimalFormat}
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}
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if len(s.data[decSepOff+1:s.off]) > maxDecDigit {
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return 0, &UnmarshalError{s.off, ErrNumberOutOfRange}
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}
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i, err := strconv.ParseFloat(str, 64)
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if err != nil {
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// Should never happen
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return 0, &UnmarshalError{s.off, err}
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}
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if neg {
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i = -i
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}
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return i, nil
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}
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