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use core::char;
use core::fmt::{self, Write as _};
use core::str;
pub fn display(mut bytes: &[u8], f: &mut fmt::Formatter) -> fmt::Result {
loop {
match str::from_utf8(bytes) {
Ok(valid) => return f.write_str(valid),
Err(utf8_error) => {
let valid_up_to = utf8_error.valid_up_to();
let valid = unsafe { str::from_utf8_unchecked(&bytes[..valid_up_to]) };
f.write_str(valid)?;
f.write_char(char::REPLACEMENT_CHARACTER)?;
if let Some(error_len) = utf8_error.error_len() {
bytes = &bytes[valid_up_to + error_len..];
} else {
return Ok(());
}
}
}
}
}
pub fn debug(mut bytes: &[u8], f: &mut fmt::Formatter) -> fmt::Result {
f.write_char('"')?;
while !bytes.is_empty() {
let from_utf8_result = str::from_utf8(bytes);
let valid = match from_utf8_result {
Ok(valid) => valid,
Err(utf8_error) => {
let valid_up_to = utf8_error.valid_up_to();
unsafe { str::from_utf8_unchecked(&bytes[..valid_up_to]) }
}
};
let mut written = 0;
for (i, ch) in valid.char_indices() {
let esc = ch.escape_debug();
if esc.len() != 1 && ch != '\'' {
f.write_str(&valid[written..i])?;
for ch in esc {
f.write_char(ch)?;
}
written = i + ch.len_utf8();
}
}
f.write_str(&valid[written..])?;
match from_utf8_result {
Ok(_valid) => break,
Err(utf8_error) => {
let end_of_broken = if let Some(error_len) = utf8_error.error_len() {
valid.len() + error_len
} else {
bytes.len()
};
for b in &bytes[valid.len()..end_of_broken] {
write!(f, "\\x{:02x}", b)?;
}
bytes = &bytes[end_of_broken..];
}
}
}
f.write_char('"')
}
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