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validator_helper_float.go
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/
validator_helper_float.go
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package validator
import (
"bytes"
"fmt"
"math"
"strconv"
"strings"
"github.com/machinefi/w3bstream/pkg/depends/kit/validator/errors"
)
// Float helper
// TODO some should move to mics
func FloatRuleParam(r *Rule) (digits uint64, decimal *uint64, err error) {
if len(r.Params) > 2 {
err = fmt.Errorf(
"float should only 1 or 2 parameter, but got %d", len(r.Params),
)
return
}
if raw := r.Params[0].Bytes(); len(raw) > 0 {
digits, err = strconv.ParseUint(string(raw), 10, 4)
if err != nil {
err = errors.NewSyntaxError(
"decimal digits should be a uint value which less than 16, but got `%s`",
raw,
)
return
}
}
if len(r.Params) == 1 {
return
}
if raw := r.Params[1].Bytes(); len(raw) > 0 {
_decimal := uint64(0)
_decimal, err = strconv.ParseUint(string(raw), 10, 4)
if err != nil || _decimal >= digits {
err = errors.NewSyntaxError(
"decimal digits should be a uint value which less than %d, but got `%s`",
digits, raw)
return
}
decimal = &_decimal
}
return
}
func FloatRuleRange(r *Rule, digits uint, decimal *uint) (*float64, *float64, error) {
if r.Range == nil {
return nil, nil, nil
}
typ := fmt.Sprintf("float<%d>", digits)
if decimal != nil {
typ = fmt.Sprintf("float<%d,%d>", digits, *decimal)
}
parseMaybeFloat := func(b []byte) (*float64, error) {
if len(b) == 0 {
return nil, nil
}
n, err := ParseFloatValue(b, digits, decimal)
if err != nil {
return nil, fmt.Errorf("%s value is not correct: %s", typ, err)
}
return &n, nil
}
ranges := r.Range
switch len(r.Range) {
case 2:
min, err := parseMaybeFloat(ranges[0].Bytes())
if err != nil {
return nil, nil, fmt.Errorf("min %s", err)
}
max, err := parseMaybeFloat(ranges[1].Bytes())
if err != nil {
return nil, nil, fmt.Errorf("max %s", err)
}
if min != nil && max != nil && *max < *min {
return nil, nil, fmt.Errorf(
"max %s value must be equal or large than min value %v, current %v",
typ, *min, *max,
)
}
return min, max, nil
case 1:
min, err := parseMaybeFloat(ranges[0].Bytes())
if err != nil {
return nil, nil, fmt.Errorf("min %s", err)
}
return min, min, nil
}
return nil, nil, nil
}
func ParseFloatValue(b []byte, digits uint, decimal *uint) (float64, error) {
f, err := strconv.ParseFloat(string(b), 64)
if err != nil {
return 0, err
}
if b[0] == '-' {
b = b[1:]
}
if b[0] == '.' {
b = append([]byte("0"), b...)
}
i := bytes.IndexRune(b, '.')
decimalDigits := digits - 1
if decimal != nil && *decimal < digits {
decimalDigits = *decimal
}
m := uint(len(b) - 1)
if uint(len(b)-1) > digits {
return 0, fmt.Errorf(
"max digits should be less than %d, but got %d", decimalDigits, m,
)
}
if i != -1 {
d := uint(len(b) - i - 1)
if d > decimalDigits {
return 0, fmt.Errorf(
"decimal digits should be less than %d, but got %d",
decimalDigits, d,
)
}
}
return f, nil
}
func FloatRuleValues(r *Rule, digits uint, decimal *uint) (multiple float64, enums map[float64]string, err error) {
values := r.ComputedValues()
if values == nil {
return
}
if len(values) == 1 {
raw := values[0].Bytes()
if raw[0] == '%' {
v := raw[1:]
multiple, err = ParseFloatValue(v, digits, decimal)
if err != nil {
err = errors.NewSyntaxError(
"multipleOf should be a valid float<%d> value, but got `%s`",
digits, v,
)
return
}
}
}
if multiple == 0 {
enums = map[float64]string{}
for _, v := range values {
b := v.Bytes()
enumv, _err := ParseFloatValue(b, digits, decimal)
if _err != nil {
err = errors.NewSyntaxError(
"enum should be a valid float<%d> value, but got `%s`",
digits, b,
)
return
}
enums[enumv] = string(b)
}
}
return
}
func IsFloatMultipleOf(v float64, div float64, decimal uint) bool {
f := v / div
prec := int(decimal)
rounded := strconv.FormatFloat(f, 'f', prec, 64)
value, _ := strconv.ParseFloat(rounded, 64)
return value == math.Trunc(value)
}
func FloatLengthOfDigit(f float64) (uint, uint) {
s := strconv.FormatFloat(f, 'e', -1, 64)
var n, d int
parts := strings.Split(s, "e")
nd := strings.Split(parts[0], ".")
i := nd[0]
n = len(i)
if len(nd) == 2 {
d = len(nd[1])
}
if len(parts) == 2 {
switch parts[1][0] {
case '+':
v, _ := strconv.ParseUint(parts[1][1:], 10, 64)
n = n + int(v)
d = d - int(v)
if d < 0 {
d = 0
}
case '-':
v, _ := strconv.ParseUint(parts[1][1:], 10, 64)
n = n - int(v)
if n <= 0 {
n = 1
}
d = d + int(v)
}
}
if math.Abs(f) < 1.0 {
n = 0
}
return uint(n + d), uint(d)
}