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
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
|
use crate::{Rope, RopeGraphemes, RopeSlice};
#[cfg(target_os = "windows")]
pub const DEFAULT_LINE_ENDING: LineEnding = LineEnding::Crlf;
#[cfg(not(target_os = "windows"))]
pub const DEFAULT_LINE_ENDING: LineEnding = LineEnding::LF;
/// Represents one of the valid Unicode line endings.
#[derive(PartialEq, Copy, Clone, Debug)]
pub enum LineEnding {
Crlf, // CarriageReturn followed by LineFeed
LF, // U+000A -- LineFeed
VT, // U+000B -- VerticalTab
FF, // U+000C -- FormFeed
CR, // U+000D -- CarriageReturn
Nel, // U+0085 -- NextLine
LS, // U+2028 -- Line Separator
PS, // U+2029 -- ParagraphSeparator
}
impl LineEnding {
#[inline]
pub fn len_chars(&self) -> usize {
match self {
Self::Crlf => 2,
_ => 1,
}
}
#[inline]
pub fn as_str(&self) -> &'static str {
match self {
Self::Crlf => "\u{000D}\u{000A}",
Self::LF => "\u{000A}",
Self::VT => "\u{000B}",
Self::FF => "\u{000C}",
Self::CR => "\u{000D}",
Self::Nel => "\u{0085}",
Self::LS => "\u{2028}",
Self::PS => "\u{2029}",
}
}
#[inline]
pub fn from_char(ch: char) -> Option<LineEnding> {
match ch {
'\u{000A}' => Some(LineEnding::LF),
'\u{000B}' => Some(LineEnding::VT),
'\u{000C}' => Some(LineEnding::FF),
'\u{000D}' => Some(LineEnding::CR),
'\u{0085}' => Some(LineEnding::Nel),
'\u{2028}' => Some(LineEnding::LS),
'\u{2029}' => Some(LineEnding::PS),
// Not a line ending
_ => None,
}
}
// Normally we'd want to implement the FromStr trait, but in this case
// that would force us into a different return type than from_char or
// or from_rope_slice, which would be weird.
#[allow(clippy::should_implement_trait)]
#[inline]
pub fn from_str(g: &str) -> Option<LineEnding> {
match g {
"\u{000D}\u{000A}" => Some(LineEnding::Crlf),
"\u{000A}" => Some(LineEnding::LF),
"\u{000B}" => Some(LineEnding::VT),
"\u{000C}" => Some(LineEnding::FF),
"\u{000D}" => Some(LineEnding::CR),
"\u{0085}" => Some(LineEnding::Nel),
"\u{2028}" => Some(LineEnding::LS),
"\u{2029}" => Some(LineEnding::PS),
// Not a line ending
_ => None,
}
}
#[inline]
pub fn from_rope_slice(g: &RopeSlice) -> Option<LineEnding> {
if let Some(text) = g.as_str() {
LineEnding::from_str(text)
} else {
// Non-contiguous, so it can't be a line ending.
// Specifically, Ropey guarantees that CRLF is always
// contiguous. And the remaining line endings are all
// single `char`s, and therefore trivially contiguous.
None
}
}
}
#[inline]
pub fn str_is_line_ending(s: &str) -> bool {
LineEnding::from_str(s).is_some()
}
/// Attempts to detect what line ending the passed document uses.
pub fn auto_detect_line_ending(doc: &Rope) -> Option<LineEnding> {
// Return first matched line ending. Not all possible line endings
// are being matched, as they might be special-use only
for line in doc.lines().take(100) {
match get_line_ending(&line) {
None | Some(LineEnding::VT) | Some(LineEnding::FF) | Some(LineEnding::PS) => {}
ending => return ending,
}
}
None
}
/// Returns the passed line's line ending, if any.
pub fn get_line_ending(line: &RopeSlice) -> Option<LineEnding> {
// Last character as str.
let g1 = line
.slice(line.len_chars().saturating_sub(1)..)
.as_str()
.unwrap();
// Last two characters as str, or empty str if they're not contiguous.
// It's fine to punt on the non-contiguous case, because Ropey guarantees
// that CRLF is always contiguous.
let g2 = line
.slice(line.len_chars().saturating_sub(2)..)
.as_str()
.unwrap_or("");
// First check the two-character case for CRLF, then check the single-character case.
LineEnding::from_str(g2).or_else(|| LineEnding::from_str(g1))
}
/// Returns the passed line's line ending, if any.
pub fn get_line_ending_of_str(line: &str) -> Option<LineEnding> {
if line.ends_with("\u{000D}\u{000A}") {
Some(LineEnding::Crlf)
} else if line.ends_with("\u{000A}") {
Some(LineEnding::LF)
} else if line.ends_with("\u{000B}") {
Some(LineEnding::VT)
} else if line.ends_with("\u{000C}") {
Some(LineEnding::FF)
} else if line.ends_with("\u{000D}") {
Some(LineEnding::CR)
} else if line.ends_with("\u{0085}") {
Some(LineEnding::Nel)
} else if line.ends_with("\u{2028}") {
Some(LineEnding::LS)
} else if line.ends_with("\u{2029}") {
Some(LineEnding::PS)
} else {
None
}
}
/// Returns the char index of the end of the given line, not including its line ending.
pub fn line_end_char_index(slice: &RopeSlice, line: usize) -> usize {
slice.line_to_char(line + 1)
- get_line_ending(&slice.line(line))
.map(|le| le.len_chars())
.unwrap_or(0)
}
#[cfg(test)]
mod line_ending_tests {
use super::*;
#[test]
fn test_autodetect() {
assert_eq!(
auto_detect_line_ending(&Rope::from_str("\n")),
Some(LineEnding::LF)
);
assert_eq!(
auto_detect_line_ending(&Rope::from_str("\r\n")),
Some(LineEnding::Crlf)
);
assert_eq!(auto_detect_line_ending(&Rope::from_str("hello")), None);
assert_eq!(auto_detect_line_ending(&Rope::from_str("")), None);
assert_eq!(
auto_detect_line_ending(&Rope::from_str("hello\nhelix\r\n")),
Some(LineEnding::LF)
);
assert_eq!(
auto_detect_line_ending(&Rope::from_str("a formfeed\u{000C}")),
None
);
assert_eq!(
auto_detect_line_ending(&Rope::from_str("\n\u{000A}\n \u{000A}")),
Some(LineEnding::LF)
);
assert_eq!(
auto_detect_line_ending(&Rope::from_str(
"a formfeed\u{000C} with a\u{000C} linefeed\u{000A}"
)),
Some(LineEnding::LF)
);
assert_eq!(auto_detect_line_ending(&Rope::from_str("a formfeed\u{000C} with a\u{000C} carriage return linefeed\u{000D}\u{000A} and a linefeed\u{000A}")), Some(LineEnding::Crlf));
}
#[test]
fn test_rope_slice_to_line_ending() {
let r = Rope::from_str("\r\n");
assert_eq!(
LineEnding::from_rope_slice(&r.slice(1..2)),
Some(LineEnding::LF)
);
assert_eq!(
LineEnding::from_rope_slice(&r.slice(0..2)),
Some(LineEnding::Crlf)
);
}
}
|
