170 lines
3.9 KiB
Go
170 lines
3.9 KiB
Go
package fixedn
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import (
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"errors"
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"strconv"
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"strings"
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"github.com/nspcc-dev/neo-go/pkg/io"
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)
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const (
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precision = 8
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decimals = 100000000
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)
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var errInvalidString = errors.New("fixed8 must satisfy following regex \\d+(\\.\\d{1,8})?")
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// Fixed8 represents a fixed-point number with precision 10^-8.
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type Fixed8 int64
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// String implements the Stringer interface.
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func (f Fixed8) String() string {
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buf := new(strings.Builder)
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val := int64(f)
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if val < 0 {
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buf.WriteRune('-')
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val = -val
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}
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str := strconv.FormatInt(val/decimals, 10)
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buf.WriteString(str)
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val %= decimals
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if val > 0 {
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buf.WriteRune('.')
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str = strconv.FormatInt(val, 10)
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for i := len(str); i < 8; i++ {
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buf.WriteRune('0')
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}
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buf.WriteString(strings.TrimRight(str, "0"))
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}
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return buf.String()
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}
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// FloatValue returns the original value representing Fixed8 as float64.
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func (f Fixed8) FloatValue() float64 {
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return float64(f) / decimals
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}
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// IntegralValue returns integer part of the original value representing
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// Fixed8 as int64.
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func (f Fixed8) IntegralValue() int64 {
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return int64(f) / decimals
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}
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// FractionalValue returns decimal part of the original value. It has the same
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// sign as f, so that f = f.IntegralValue() + f.FractionalValue().
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func (f Fixed8) FractionalValue() int32 {
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return int32(int64(f) % decimals)
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}
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// Fixed8FromInt64 returns a new Fixed8 type multiplied by decimals.
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func Fixed8FromInt64(val int64) Fixed8 {
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return Fixed8(decimals * val)
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}
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// Fixed8FromFloat returns a new Fixed8 type multiplied by decimals.
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func Fixed8FromFloat(val float64) Fixed8 {
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return Fixed8(int64(decimals * val))
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}
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// Fixed8FromString parses s which must be a fixed point number
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// with precision up to 10^-8
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func Fixed8FromString(s string) (Fixed8, error) {
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num, err := FromString(s, precision)
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if err != nil {
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return 0, err
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}
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return Fixed8(num.Int64()), err
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}
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// UnmarshalJSON implements the json unmarshaller interface.
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func (f *Fixed8) UnmarshalJSON(data []byte) error {
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if len(data) > 2 {
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if data[0] == '"' && data[len(data)-1] == '"' {
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data = data[1 : len(data)-1]
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}
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}
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return f.setFromString(string(data))
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}
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// UnmarshalYAML implements the yaml unmarshaler interface.
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func (f *Fixed8) UnmarshalYAML(unmarshal func(interface{}) error) error {
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var s string
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err := unmarshal(&s)
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if err != nil {
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return err
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}
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return f.setFromString(s)
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}
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func (f *Fixed8) setFromString(s string) error {
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p, err := Fixed8FromString(s)
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if err != nil {
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return err
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}
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*f = p
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return nil
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}
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// MarshalJSON implements the json marshaller interface.
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func (f Fixed8) MarshalJSON() ([]byte, error) {
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return []byte(`"` + f.String() + `"`), nil
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}
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// MarshalYAML implements the yaml marshaller interface.
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func (f Fixed8) MarshalYAML() (interface{}, error) {
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return f.String(), nil
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}
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// DecodeBinary implements the io.Serializable interface.
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func (f *Fixed8) DecodeBinary(r *io.BinReader) {
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*f = Fixed8(r.ReadU64LE())
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}
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// EncodeBinary implements the io.Serializable interface.
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func (f *Fixed8) EncodeBinary(w *io.BinWriter) {
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w.WriteU64LE(uint64(*f))
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}
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// Satoshi defines the value of a 'Satoshi'.
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func Satoshi() Fixed8 {
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return Fixed8(1)
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}
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// Div implements Fixd8 division operator.
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func (f Fixed8) Div(i int64) Fixed8 {
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return f / Fixed8FromInt64(i)
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}
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// Add implements Fixd8 addition operator.
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func (f Fixed8) Add(g Fixed8) Fixed8 {
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return f + g
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}
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// Sub implements Fixd8 subtraction operator.
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func (f Fixed8) Sub(g Fixed8) Fixed8 {
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return f - g
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}
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// LessThan implements Fixd8 < operator.
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func (f Fixed8) LessThan(g Fixed8) bool {
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return f < g
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}
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// GreaterThan implements Fixd8 < operator.
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func (f Fixed8) GreaterThan(g Fixed8) bool {
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return f > g
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}
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// Equal implements Fixd8 == operator.
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func (f Fixed8) Equal(g Fixed8) bool {
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return f == g
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}
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// CompareTo returns the difference between the f and g.
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// difference < 0 implies f < g.
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// difference = 0 implies f = g.
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// difference > 0 implies f > g.
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func (f Fixed8) CompareTo(g Fixed8) int {
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return int(f - g)
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}
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