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