aho_corasick/util/
debug.rs

1/// A type that wraps a single byte with a convenient fmt::Debug impl that
2/// escapes the byte.
3pub(crate) struct DebugByte(pub(crate) u8);
4
5impl core::fmt::Debug for DebugByte {
6    fn fmt(&self, f: &mut core::fmt::Formatter) -> core::fmt::Result {
7        // Special case ASCII space. It's too hard to read otherwise, so
8        // put quotes around it. I sometimes wonder whether just '\x20' would
9        // be better...
10        if self.0 == b' ' {
11            return write!(f, "' '");
12        }
13        // 10 bytes is enough to cover any output from ascii::escape_default.
14        let mut bytes = [0u8; 10];
15        let mut len = 0;
16        for (i, mut b) in core::ascii::escape_default(self.0).enumerate() {
17            // capitalize \xab to \xAB
18            if i >= 2 && b'a' <= b && b <= b'f' {
19                b -= 32;
20            }
21            bytes[len] = b;
22            len += 1;
23        }
24        write!(f, "{}", core::str::from_utf8(&bytes[..len]).unwrap())
25    }
26}
aho_corasick/util/debug.rs

aho_corasick/util/
debug.rs
