// Scan is a support routine for fmt.Scanner; it sets z to the value of
// the scanned number. It accepts the decimal formats 'd' and 'f', and
// handles both equivalently. Bases 2, 8, 16 are not supported.
// The scale of z is the number of digits after the decimal point
// (including any trailing 0s), or 0 if there is no decimal point.
func (z *Dec) Scan(s fmt.ScanState, ch rune) error {
if ch != 'd' && ch != 'f' && ch != 's' && ch != 'v' {
return fmt.Errorf("Dec.Scan: invalid verb '%c'", ch)
}
s.SkipSpace()
_, err := z.scan(s)
return err
}
// Scan is a support routine for fmt.Scanner; it sets z to the value of
// the scanned number. It accepts the formats 'b' (binary), 'o' (octal),
// 'd' (decimal), 'x' (lowercase hexadecimal), and 'X' (uppercase hexadecimal).
func (z *Int) Scan(s fmt.ScanState, ch int) os.Error {
s.SkipSpace() // skip leading space characters
base := 0
switch ch {
case 'b':
base = 2
case 'o':
base = 8
case 'd':
base = 10
case 'x', 'X':
base = 16
case 's', 'v':
// let scan determine the base
default:
return os.NewError("Int.Scan: invalid verb")
}
_, _, err := z.scan(s, base)
return err
}
// Scan is a support routine for fmt.Scanner; it sets z to the value of
// the scanned number. It accepts formats whose verbs are supported by
// fmt.Scan for floating point values, which are:
// 'b' (binary), 'e', 'E', 'f', 'F', 'g' and 'G'.
// Scan doesn't handle ±Inf.
func (z *Float) Scan(s fmt.ScanState, ch rune) error {
s.SkipSpace()
_, _, err := z.scan(byteReader{s}, 0)
return err
}
// Scan is a support routine for fmt.Scanner; it sets z to the value of
// the scanned number. It accepts the formats 'b' (binary), 'o' (octal),
// 'd' (decimal), 'x' (lowercase hexadecimal), and 'X' (uppercase hexadecimal).
func (z *Int) Scan(s fmt.ScanState, ch rune) error {
s.SkipSpace() // skip leading space characters
base := 0
switch ch {
case 'b':
base = 2
case 'o':
base = 8
case 'd':
base = 10
case 'x', 'X':
base = 16
case 's', 'v':
// let scan determine the base
case 'z':
base = 60
default:
return errors.New("Int.Scan: invalid verb")
}
charset := "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz."
if base != 0 {
charset = charset[:base]
}
// Read the number into in
in := make([]byte, 0, 16)
var err error
var n int
for {
ch, n, err = s.ReadRune()
if err == io.EOF {
break
}
if err != nil {
return err
}
if n > 1 {
// Wide character - must be the end
s.UnreadRune()
break
}
if len(in) == 0 {
if ch == '+' {
// Skip leading + as gmp doesn't understand them
continue
}
if ch == '-' {
goto ok
}
}
if len(in) == 1 && base == 0 {
if ch == 'b' || ch == 'x' {
goto ok
}
}
if !strings.ContainsRune(charset, ch) {
// Bad character - end
s.UnreadRune()
break
}
ok:
in = append(in, byte(ch))
}
// Use GMP to convert it as it is very efficient for large numbers
z.doinit()
// null terminate for C
in = append(in, 0)
if C.mpz_set_str(&z.i[0], (*C.char)(unsafe.Pointer(&in[0])), C.int(base)) < 0 {
return errors.New("Int.Scan: failed")
}
return nil
}
