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pub fn is_alnum(c: u8) -> bool { is_alpha(c) || is_digit(c) } pub fn is_alpha(c: u8) -> bool { is_lower(c) || is_upper(c) } pub fn is_blank(c: u8) -> bool { c == b' ' || c == b'\t' } pub fn is_cntrl(c: u8) -> bool { c <= 0x1f || c == 0x7f } pub fn is_digit(c: u8) -> bool { c >= b'0' && c <= b'9' } pub fn is_graph(c: u8) -> bool { c >= 0x21 && c <= 0x7e } pub fn is_lower(c: u8) -> bool { c >= b'a' && c <= b'z' } pub fn is_print(c: u8) -> bool { c >= 0x20 && c <= 0x7e } pub fn is_punct(c: u8) -> bool { is_graph(c) && !is_alnum(c) } pub fn is_space(c: u8) -> bool { c == b' ' || (c >= 0x9 && c <= 0xD) } pub fn is_upper(c: u8) -> bool { c >= b'A' && c <= b'Z' } pub fn is_xdigit(c: u8) -> bool { is_digit(c) || (c >= b'a' && c <= b'f') || (c >= b'A' && c <= b'F') } pub fn is_word_boundary(c: u8) -> bool { !is_alnum(c) && c != b'_' }