Files
goreplay/size/size.go
T
2020-09-21 13:43:02 -04:00

65 lines
1.3 KiB
Go

package size
import (
"fmt"
"regexp"
"strconv"
)
// Size represents size that implements flag.Var
type Size int64
// the following regexes follow Go semantics https://golang.org/ref/spec#Letters_and_digits
var (
rB = regexp.MustCompile(`(?i)^(?:0b|0x|0o)?[\da-f_]+$`)
rKB = regexp.MustCompile(`(?i)^(?:0b|0x|0o)?[\da-f_]+kb$`)
rMB = regexp.MustCompile(`(?i)^(?:0b|0x|0o)?[\da-f_]+mb$`)
rGB = regexp.MustCompile(`(?i)^(?:0b|0x|0o)?[\da-f_]+gb$`)
rTB = regexp.MustCompile(`(?i)^(?:0b|0x|0o)?[\da-f_]+tb$`)
)
// Set parses size to integer from different bases and data units
func (siz *Size) Set(size string) (err error) {
if size == "" {
return
}
const (
_ = 1 << (iota * 10)
KB
MB
GB
TB
)
var (
lmt = len(size) - 2
s = []byte(size)
)
var _len int64
switch {
case rB.Match(s):
_len, err = strconv.ParseInt(size, 0, 64)
case rKB.Match(s):
_len, err = strconv.ParseInt(size[:lmt], 0, 64)
_len *= KB
case rMB.Match(s):
_len, err = strconv.ParseInt(size[:lmt], 0, 64)
_len *= MB
case rGB.Match(s):
_len, err = strconv.ParseInt(size[:lmt], 0, 64)
_len *= GB
case rTB.Match(s):
_len, err = strconv.ParseInt(size[:lmt], 0, 64)
_len *= TB
default:
return fmt.Errorf("invalid _len %q", size)
}
*siz = Size(_len)
return
}
func (siz *Size) String() string {
return fmt.Sprintf("%d", *siz)
}