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package config
import (
"fmt"
"math"
"strconv"
"strings"
"lindenii.org/go/lgo/intconv"
)
func parseBool(value string) (bool, error) {
switch {
case strings.EqualFold(value, "true"),
strings.EqualFold(value, "yes"),
strings.EqualFold(value, "on"):
return true, nil
case strings.EqualFold(value, "false"),
strings.EqualFold(value, "no"),
strings.EqualFold(value, "off"),
value == "":
return false, nil
}
n, err := parseInt32(value)
if err != nil {
return false, err
}
return n != 0, nil
}
func parseInt32(value string) (int32, error) {
n64, err := parseInt64WithMax(value, math.MaxInt32)
if err != nil {
return 0, err
}
n32, err := intconv.Int64ToInt32(n64)
if err != nil {
return 0, fmt.Errorf("%w: %q", ErrValueRange, value)
}
return n32, nil
}
func parseInt(value string) (int, error) {
n64, err := parseInt64WithMax(value, int64(int(^uint(0)>>1)))
if err != nil {
return 0, err
}
return int(n64), nil
}
func parseInt64(value string) (int64, error) {
return parseInt64WithMax(value, int64(^uint64(0)>>1))
}
func parseInt64WithMax(value string, maxValue int64) (int64, error) {
if value == "" {
return 0, ErrValueEmpty
}
trimmed := strings.TrimLeft(value, " \t\n\r\f\v")
if trimmed == "" {
return 0, fmt.Errorf("%w: %q", ErrValueEmpty, value)
}
numPart := trimmed
factor := int64(1)
if last := trimmed[len(trimmed)-1]; last == 'k' || last == 'K' || last == 'm' || last == 'M' || last == 'g' || last == 'G' {
switch toLower(last) {
case 'k':
factor = 1024
case 'm':
factor = 1024 * 1024
case 'g':
factor = 1024 * 1024 * 1024
}
numPart = trimmed[:len(trimmed)-1]
}
if numPart == "" {
return 0, fmt.Errorf("%w: %q", ErrValueSyntax, value)
}
n, err := strconv.ParseInt(numPart, 0, 64)
if err != nil {
return 0, fmt.Errorf("%w: %q: %w", ErrValueSyntax, value, err)
}
intMax := maxValue
intMin := -maxValue - 1
if n > 0 && n > intMax/factor {
return 0, fmt.Errorf("%w: %q", ErrValueRange, value)
}
if n < 0 && n < intMin/factor {
return 0, fmt.Errorf("%w: %q", ErrValueRange, value)
}
n *= factor
return n, nil
}
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