21 pub fn is_alphabetic(chr: u8) -> bool {  in is_alphabetic()
22   (chr >= 0x41 && chr <= 0x5A) || (chr >= 0x61 && chr <= 0x7A)  in is_alphabetic()
35 pub fn is_digit(chr: u8) -> bool {  in is_digit()
36   chr >= 0x30 && chr <= 0x39  in is_digit()
51 pub fn is_hex_digit(chr: u8) -> bool {  in is_hex_digit()
52   (chr >= 0x30 && chr <= 0x39) || (chr >= 0x41 && chr <= 0x46) || (chr >= 0x61 && chr <= 0x66)  in is_hex_digit()
66 pub fn is_oct_digit(chr: u8) -> bool {  in is_oct_digit()
67   chr >= 0x30 && chr <= 0x37  in is_oct_digit()
82 pub fn is_alphanumeric(chr: u8) -> bool {  in is_alphanumeric()
83   is_alphabetic(chr) || is_digit(chr)  in is_alphanumeric()
98 pub fn is_space(chr: u8) -> bool {  in is_space()
99   chr == b' ' || chr == b'\t'  in is_space()