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
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
use alloc::{borrow::Cow, string::String, vec::Vec};
use core::str::from_utf8_unchecked;
#[cfg(feature = "std")]
use std::io::{self, Write};
macro_rules! parse_style {
(@eof $step:ident, $b:block) => {
// The text ends right after `<\/style`.
if $step == 8 {
$b
}
};
($e:expr, $step:ident, $b:block, $bc:block) => {
match $step {
0 => match $e {
b'<' => $step = 1,
_ => (),
},
1 => match $e {
b'\\' => $step = 2,
b'<' => $step = 1,
_ => $step = 0,
},
2 => match $e {
b'/' => $step = 3,
b'!' => $step = 10,
b'<' => $step = 1,
_ => $step = 0,
},
3 => match $e {
b's' | b'S' => $step = 4,
b'<' => $step = 1,
_ => $step = 0,
},
4 => match $e {
b't' | b'T' => $step = 5,
b'<' => $step = 1,
_ => $step = 0,
},
5 => match $e {
b'y' | b'Y' => $step = 6,
b'<' => $step = 1,
_ => $step = 0,
},
6 => match $e {
b'l' | b'L' => $step = 7,
b'<' => $step = 1,
_ => $step = 0,
},
7 => match $e {
b'e' | b'E' => $step = 8,
b'<' => $step = 1,
_ => $step = 0,
},
8 => match $e {
b'/' | b'>' | 9..=13 | 28..=32 => {
$step = 0;
$b
},
b'<' => $step = 1,
_ => $step = 0,
},
10 => match $e {
b'-' => $step = 11,
b'<' => $step = 1,
_ => $step = 0,
},
11 => match $e {
b'-' => {
$step = 0;
$bc
},
b'<' => $step = 1,
_ => $step = 0,
},
_ => unreachable!(),
}
};
}
decode_impl! {
6;
/// The following substring is unescaped:
///
/// * `<\/style>` => `</style>`
/// * `<\!--` => `<!--`
///
/// `<\/style` at the end of the text is also unescaped.
/// This only removes the listed escapes and does not parse CSS.
/// Existing escapes in the original text may also be removed, so encoding and decoding may not return the original text.
parse_style;
/// Decode text from the `<style>` element.
decode_style;
/// Write text from the `<style>` element to a mutable `String` reference and return the decoded string slice.
decode_style_to_string;
/// Write text from the `<style>` element to a mutable `Vec<u8>` reference and return the decoded data slice.
decode_style_to_vec;
/// Write text from the `<style>` element to a writer.
decode_style_to_writer;
}
decode_impl! {
quoted true, true, false;
/// Escapes emitted by the matching encoder are decoded.
/// Hex escapes need two uppercase digits and one ending space; only escaped C0 controls and `<` are decoded.
/// Only the ending space is removed; an input space after it is kept.
/// U+FFFD from an encoded NUL is kept as U+FFFD.
/// Backslashes and `'` escaped with a backslash are decoded.
/// Legacy `<\/style>` and `<\!--` escapes are also decoded.
/// Unknown or incomplete escapes are kept, and decoded text is not decoded again.
raw_text;
/// Decode content of a single-quoted CSS string from `<style>`.
decode_style_single_quoted_text;
/// Decode content of a single-quoted CSS string to a mutable `String` and return the new string slice.
decode_style_single_quoted_text_to_string;
/// Decode content of a single-quoted CSS string to a mutable `Vec<u8>` and return the new data slice.
decode_style_single_quoted_text_to_vec;
/// Decode content of a single-quoted CSS string to a writer.
decode_style_single_quoted_text_to_writer;
}
decode_impl! {
quoted true, false, true;
/// Escapes emitted by the matching encoder are decoded.
/// Hex escapes need two uppercase digits and one ending space; only escaped C0 controls and `<` are decoded.
/// Only the ending space is removed; an input space after it is kept.
/// U+FFFD from an encoded NUL is kept as U+FFFD.
/// Backslashes and `"` escaped with a backslash are decoded.
/// Legacy `<\/style>` and `<\!--` escapes are also decoded.
/// Unknown or incomplete escapes are kept, and decoded text is not decoded again.
raw_text;
/// Decode content of a double-quoted CSS string from `<style>`.
decode_style_double_quoted_text;
/// Decode content of a double-quoted CSS string to a mutable `String` and return the new string slice.
decode_style_double_quoted_text_to_string;
/// Decode content of a double-quoted CSS string to a mutable `Vec<u8>` and return the new data slice.
decode_style_double_quoted_text_to_vec;
/// Decode content of a double-quoted CSS string to a writer.
decode_style_double_quoted_text_to_writer;
}
decode_impl! {
quoted true, true, true;
/// Escapes emitted by the matching encoder are decoded.
/// Hex escapes need two uppercase digits and one ending space; only escaped C0 controls and `<` are decoded.
/// Only the ending space is removed; an input space after it is kept.
/// U+FFFD from an encoded NUL is kept as U+FFFD.
/// Backslashes, `'`, and `"` escaped with a backslash are decoded.
/// Legacy `<\/style>` and `<\!--` escapes are also decoded.
/// Unknown or incomplete escapes are kept, and decoded text is not decoded again.
raw_text;
/// Decode content of a single-quoted or double-quoted CSS string from `<style>`.
decode_style_quoted_text;
/// Decode content of a single-quoted or double-quoted CSS string to a mutable `String` and return the new string slice.
decode_style_quoted_text_to_string;
/// Decode content of a single-quoted or double-quoted CSS string to a mutable `Vec<u8>` and return the new data slice.
decode_style_quoted_text_to_vec;
/// Decode content of a single-quoted or double-quoted CSS string to a writer.
decode_style_quoted_text_to_writer;
}