Returns an iterator that produces an escaped version of a u8.

The default is chosen with a bias toward producing literals that are legal in a variety of languages, including C++11 and similar C-family languages. The exact rules are:

• Tab is escaped as \t.
• Carriage return is escaped as \r.
• Line feed is escaped as \n.
• Single quote is escaped as \'.
• Double quote is escaped as \".
• Backslash is escaped as \\.
• Any character in the 'printable ASCII' range 0x20 .. 0x7e inclusive is not escaped.
• Any other chars are given hex escapes of the form '\xNN'.
• Unicode escapes are never generated by this function.

Examples

use std::ascii;

let escaped = ascii::escape_default(b'0').next().unwrap();
assert_eq!(b'0', escaped);

let mut escaped = ascii::escape_default(b'\t');

assert_eq!(b'\\', escaped.next().unwrap());
assert_eq!(b't', escaped.next().unwrap());

let mut escaped = ascii::escape_default(b'\r');

assert_eq!(b'\\', escaped.next().unwrap());
assert_eq!(b'r', escaped.next().unwrap());

let mut escaped = ascii::escape_default(b'\n');

assert_eq!(b'\\', escaped.next().unwrap());
assert_eq!(b'n', escaped.next().unwrap());

let mut escaped = ascii::escape_default(b'\'');

assert_eq!(b'\\', escaped.next().unwrap());
assert_eq!(b'\'', escaped.next().unwrap());

let mut escaped = ascii::escape_default(b'"');

assert_eq!(b'\\', escaped.next().unwrap());
assert_eq!(b'"', escaped.next().unwrap());

let mut escaped = ascii::escape_default(b'\\');

assert_eq!(b'\\', escaped.next().unwrap());
assert_eq!(b'\\', escaped.next().unwrap());

let mut escaped = ascii::escape_default(b'\x9d');

assert_eq!(b'\\', escaped.next().unwrap());
assert_eq!(b'x', escaped.next().unwrap());
assert_eq!(b'9', escaped.next().unwrap());
assert_eq!(b'd', escaped.next().unwrap());