1 | use core::fmt::{Debug, Formatter, Result}; |
2 | |
3 | use super::BytesRef; |
4 | use crate::{Bytes, BytesMut}; |
5 | |
6 | /// Alternative implementation of `std::fmt::Debug` for byte slice. |
7 | /// |
8 | /// Standard `Debug` implementation for `[u8]` is comma separated |
9 | /// list of numbers. Since large amount of byte strings are in fact |
10 | /// ASCII strings or contain a lot of ASCII strings (e. g. HTTP), |
11 | /// it is convenient to print strings as ASCII when possible. |
12 | impl Debug for BytesRef<'_> { |
13 | fn fmt(&self, f: &mut Formatter<'_>) -> Result { |
14 | write!(f, "b \"" )?; |
15 | for &b in self.0 { |
16 | // https://doc.rust-lang.org/reference/tokens.html#byte-escapes |
17 | if b == b' \n' { |
18 | write!(f, " \\n" )?; |
19 | } else if b == b' \r' { |
20 | write!(f, " \\r" )?; |
21 | } else if b == b' \t' { |
22 | write!(f, " \\t" )?; |
23 | } else if b == b' \\' || b == b'"' { |
24 | write!(f, " \\{}" , b as char)?; |
25 | } else if b == b' \0' { |
26 | write!(f, " \\0" )?; |
27 | // ASCII printable |
28 | } else if (0x20..0x7f).contains(&b) { |
29 | write!(f, "{}" , b as char)?; |
30 | } else { |
31 | write!(f, " \\x{:02x}" , b)?; |
32 | } |
33 | } |
34 | write!(f, " \"" )?; |
35 | Ok(()) |
36 | } |
37 | } |
38 | |
39 | impl Debug for Bytes { |
40 | fn fmt(&self, f: &mut Formatter<'_>) -> Result { |
41 | Debug::fmt(&BytesRef(self.as_ref()), f) |
42 | } |
43 | } |
44 | |
45 | impl Debug for BytesMut { |
46 | fn fmt(&self, f: &mut Formatter<'_>) -> Result { |
47 | Debug::fmt(&BytesRef(self.as_ref()), f) |
48 | } |
49 | } |
50 | |