mirror of
https://github.com/nspcc-dev/neo-go.git
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153 lines
3.4 KiB
Go
153 lines
3.4 KiB
Go
package util
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import (
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"encoding/json"
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"errors"
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"strconv"
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"strings"
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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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// Int64Value returns the original value representing Fixed8 as int64.
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func (f Fixed8) Int64Value() int64 {
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return 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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parts := strings.SplitN(s, ".", 2)
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ip, err := strconv.ParseInt(parts[0], 10, 64)
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if err != nil {
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return 0, errInvalidString
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} else if len(parts) == 1 {
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return Fixed8(ip * decimals), nil
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}
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fp, err := strconv.ParseInt(parts[1], 10, 64)
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if err != nil || fp >= decimals {
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return 0, errInvalidString
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}
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for i := len(parts[1]); i < precision; i++ {
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fp *= 10
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}
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if ip < 0 {
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return Fixed8(ip*decimals - fp), nil
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}
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return Fixed8(ip*decimals + fp), nil
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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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var s string
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if err := json.Unmarshal(data, &s); err == nil {
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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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var fl float64
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if err := json.Unmarshal(data, &fl); err != nil {
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return err
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}
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*f = Fixed8(decimals * fl)
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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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// 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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