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bytes.rs
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61 lines (54 loc) · 1.62 KB
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pub fn repr(b: &[u8]) -> String {
repr_with(b, &[], "")
}
pub fn repr_with(b: &[u8], prefixes: &[&str], suffix: &str) -> String {
use std::fmt::Write;
let mut out_len = 0usize;
let mut squote = 0;
let mut dquote = 0;
for &ch in b {
let incr = match ch {
b'\'' => {
squote += 1;
1
}
b'"' => {
dquote += 1;
1
}
b'\\' | b'\t' | b'\r' | b'\n' => 2,
0x20..=0x7e => 1,
_ => 4, // \xHH
};
// TODO: OverflowError
out_len = out_len.checked_add(incr).unwrap();
}
let (quote, num_escaped_quotes) = crate::str::choose_quotes_for_repr(squote, dquote);
// we'll be adding backslashes in front of the existing inner quotes
out_len += num_escaped_quotes;
// 3 is for b prefix + outer quotes
out_len += 3 + prefixes.iter().map(|s| s.len()).sum::<usize>() + suffix.len();
let mut res = String::with_capacity(out_len);
res.extend(prefixes.iter().copied());
res.push('b');
res.push(quote);
for &ch in b {
match ch {
b'\t' => res.push_str("\\t"),
b'\n' => res.push_str("\\n"),
b'\r' => res.push_str("\\r"),
// printable ascii range
0x20..=0x7e => {
let ch = ch as char;
if ch == quote || ch == '\\' {
res.push('\\');
}
res.push(ch);
}
_ => write!(res, "\\x{:02x}", ch).unwrap(),
}
}
res.push(quote);
res.push_str(suffix);
res
}