blob: 49301734bdcdf6c6a1a37a6497709dbbd4139540 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
|
use std::borrow::Cow;
use std::char;
use std::fmt;
const UNKNOWN_CHAR: char = '�';
fn encode_unicode(s: Option<&str>) -> char {
s.and_then(|s| u32::from_str_radix(s, 16).ok().and_then(char::from_u32))
.unwrap_or(UNKNOWN_CHAR)
}
pub fn unescape_unicode<W>(w: &mut W, input: &str) -> fmt::Result
where
W: fmt::Write,
{
let bytes = input.as_bytes();
let mut start = 0;
let mut ptr = 0;
while let Some(b) = bytes.get(ptr) {
if b != &b'\\' {
ptr += 1;
continue;
}
if start != ptr {
w.write_str(&input[start..ptr])?;
}
ptr += 1;
let new_char = match bytes.get(ptr) {
Some(b'\\') => '\\',
Some(b'"') => '"',
Some(u @ b'u') | Some(u @ b'U') => {
let seq_start = ptr + 1;
let len = if u == &b'u' { 4 } else { 6 };
ptr += len;
encode_unicode(input.get(seq_start..seq_start + len))
}
_ => UNKNOWN_CHAR,
};
ptr += 1;
w.write_char(new_char)?;
start = ptr;
}
if start != ptr {
w.write_str(&input[start..ptr])?;
}
Ok(())
}
pub fn unescape_unicode_to_string(input: &str) -> Cow<str> {
let bytes = input.as_bytes();
let mut result = Cow::from(input);
let mut ptr = 0;
while let Some(b) = bytes.get(ptr) {
if b != &b'\\' {
if let Cow::Owned(ref mut s) = result {
s.push(*b as char);
}
ptr += 1;
continue;
}
if let Cow::Borrowed(_) = result {
result = Cow::from(&input[0..ptr]);
}
ptr += 1;
let new_char = match bytes.get(ptr) {
Some(b'\\') => '\\',
Some(b'"') => '"',
Some(u @ b'u') | Some(u @ b'U') => {
let start = ptr + 1;
let len = if u == &b'u' { 4 } else { 6 };
ptr += len;
input
.get(start..(start + len))
.map_or(UNKNOWN_CHAR, |slice| encode_unicode(Some(slice)))
}
_ => UNKNOWN_CHAR,
};
result.to_mut().push(new_char);
ptr += 1;
}
result
}
|
