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|
package config
import (
"errors"
"fmt"
"math"
"strconv"
"strings"
"codeberg.org/lindenii/furgit/internal/intconv"
)
// ValueKind describes the presence and form of a config value.
type ValueKind uint8
const (
// ValueMissing means the queried key does not exist.
ValueMissing ValueKind = iota
// ValueValueless means the key exists but has no "= <value>" part.
ValueValueless
// ValueString means the key exists and has an explicit value (possibly "").
ValueString
)
func isValidSection(s string) bool {
if len(s) == 0 {
return false
}
for i := range len(s) {
ch := s[i]
if !isLetter(ch) && !isDigit(ch) && ch != '-' && ch != '.' {
return false
}
}
return true
}
func isKeyChar(ch byte) bool {
return isLetter(ch) || isDigit(ch) || ch == '-'
}
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, fmt.Errorf("invalid boolean value %q", value)
}
return n != 0, nil
}
func parseInt32(value string) (int32, error) {
n64, err := parseInt64WithMax(value, math.MaxInt32)
if err != nil {
return 0, err
}
return intconv.Int64ToInt32(n64)
}
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, errors.New("empty value")
}
trimmed := strings.TrimLeft(value, " \t\n\r\f\v")
if trimmed == "" {
return 0, errors.New("empty 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, errors.New("missing integer value")
}
n, err := strconv.ParseInt(numPart, 0, 64)
if err != nil {
return 0, err
}
intMax := maxValue
intMin := -maxValue - 1
if n > 0 && n > intMax/factor {
return 0, errors.New("integer overflow")
}
if n < 0 && n < intMin/factor {
return 0, errors.New("integer overflow")
}
n *= factor
return n, nil
}
func truncateAtNUL(value string) string {
for i := range len(value) {
if value[i] == 0 {
return value[:i]
}
}
return value
}
func isSpace(ch byte) bool {
return ch == ' ' || ch == '\t'
}
func isWhitespace(ch byte) bool {
return ch == ' ' || ch == '\t' || ch == '\n' || ch == '\r' || ch == '\v' || ch == '\f'
}
func isLetter(ch byte) bool {
return (ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z')
}
func isDigit(ch byte) bool {
return ch >= '0' && ch <= '9'
}
func toLower(ch byte) byte {
if ch >= 'A' && ch <= 'Z' {
return ch + ('a' - 'A')
}
return ch
}
|
