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-rw-r--r--crates/ra_ide/src/line_index.rs283
1 files changed, 0 insertions, 283 deletions
diff --git a/crates/ra_ide/src/line_index.rs b/crates/ra_ide/src/line_index.rs
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--- a/crates/ra_ide/src/line_index.rs
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1//! FIXME: write short doc here
2
3use crate::TextUnit;
4use rustc_hash::FxHashMap;
5use superslice::Ext;
6
7#[derive(Clone, Debug, PartialEq, Eq)]
8pub struct LineIndex {
9 pub(crate) newlines: Vec<TextUnit>,
10 pub(crate) utf16_lines: FxHashMap<u32, Vec<Utf16Char>>,
11}
12
13#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
14pub struct LineCol {
15 /// Zero-based
16 pub line: u32,
17 /// Zero-based
18 pub col_utf16: u32,
19}
20
21#[derive(Clone, Debug, Hash, PartialEq, Eq)]
22pub(crate) struct Utf16Char {
23 pub(crate) start: TextUnit,
24 pub(crate) end: TextUnit,
25}
26
27impl Utf16Char {
28 fn len(&self) -> TextUnit {
29 self.end - self.start
30 }
31}
32
33impl LineIndex {
34 pub fn new(text: &str) -> LineIndex {
35 let mut utf16_lines = FxHashMap::default();
36 let mut utf16_chars = Vec::new();
37
38 let mut newlines = vec![0.into()];
39 let mut curr_row = 0.into();
40 let mut curr_col = 0.into();
41 let mut line = 0;
42 for c in text.chars() {
43 curr_row += TextUnit::of_char(c);
44 if c == '\n' {
45 newlines.push(curr_row);
46
47 // Save any utf-16 characters seen in the previous line
48 if !utf16_chars.is_empty() {
49 utf16_lines.insert(line, utf16_chars);
50 utf16_chars = Vec::new();
51 }
52
53 // Prepare for processing the next line
54 curr_col = 0.into();
55 line += 1;
56 continue;
57 }
58
59 let char_len = TextUnit::of_char(c);
60 if char_len.to_usize() > 1 {
61 utf16_chars.push(Utf16Char { start: curr_col, end: curr_col + char_len });
62 }
63
64 curr_col += char_len;
65 }
66
67 // Save any utf-16 characters seen in the last line
68 if !utf16_chars.is_empty() {
69 utf16_lines.insert(line, utf16_chars);
70 }
71
72 LineIndex { newlines, utf16_lines }
73 }
74
75 pub fn line_col(&self, offset: TextUnit) -> LineCol {
76 let line = self.newlines.upper_bound(&offset) - 1;
77 let line_start_offset = self.newlines[line];
78 let col = offset - line_start_offset;
79
80 LineCol { line: line as u32, col_utf16: self.utf8_to_utf16_col(line as u32, col) as u32 }
81 }
82
83 pub fn offset(&self, line_col: LineCol) -> TextUnit {
84 //FIXME: return Result
85 let col = self.utf16_to_utf8_col(line_col.line, line_col.col_utf16);
86 self.newlines[line_col.line as usize] + col
87 }
88
89 fn utf8_to_utf16_col(&self, line: u32, mut col: TextUnit) -> usize {
90 if let Some(utf16_chars) = self.utf16_lines.get(&line) {
91 let mut correction = TextUnit::from_usize(0);
92 for c in utf16_chars {
93 if col >= c.end {
94 correction += c.len() - TextUnit::from_usize(1);
95 } else {
96 // From here on, all utf16 characters come *after* the character we are mapping,
97 // so we don't need to take them into account
98 break;
99 }
100 }
101
102 col -= correction;
103 }
104
105 col.to_usize()
106 }
107
108 fn utf16_to_utf8_col(&self, line: u32, col: u32) -> TextUnit {
109 let mut col: TextUnit = col.into();
110 if let Some(utf16_chars) = self.utf16_lines.get(&line) {
111 for c in utf16_chars {
112 if col >= c.start {
113 col += c.len() - TextUnit::from_usize(1);
114 } else {
115 // From here on, all utf16 characters come *after* the character we are mapping,
116 // so we don't need to take them into account
117 break;
118 }
119 }
120 }
121
122 col
123 }
124}
125
126#[cfg(test)]
127/// Simple reference implementation to use in proptests
128pub fn to_line_col(text: &str, offset: TextUnit) -> LineCol {
129 let mut res = LineCol { line: 0, col_utf16: 0 };
130 for (i, c) in text.char_indices() {
131 if i + c.len_utf8() > offset.to_usize() {
132 // if it's an invalid offset, inside a multibyte char
133 // return as if it was at the start of the char
134 break;
135 }
136 if c == '\n' {
137 res.line += 1;
138 res.col_utf16 = 0;
139 } else {
140 res.col_utf16 += 1;
141 }
142 }
143 res
144}
145
146#[cfg(test)]
147mod test_line_index {
148 use super::*;
149 use proptest::{prelude::*, proptest};
150 use ra_text_edit::test_utils::{arb_offset, arb_text};
151
152 #[test]
153 fn test_line_index() {
154 let text = "hello\nworld";
155 let index = LineIndex::new(text);
156 assert_eq!(index.line_col(0.into()), LineCol { line: 0, col_utf16: 0 });
157 assert_eq!(index.line_col(1.into()), LineCol { line: 0, col_utf16: 1 });
158 assert_eq!(index.line_col(5.into()), LineCol { line: 0, col_utf16: 5 });
159 assert_eq!(index.line_col(6.into()), LineCol { line: 1, col_utf16: 0 });
160 assert_eq!(index.line_col(7.into()), LineCol { line: 1, col_utf16: 1 });
161 assert_eq!(index.line_col(8.into()), LineCol { line: 1, col_utf16: 2 });
162 assert_eq!(index.line_col(10.into()), LineCol { line: 1, col_utf16: 4 });
163 assert_eq!(index.line_col(11.into()), LineCol { line: 1, col_utf16: 5 });
164 assert_eq!(index.line_col(12.into()), LineCol { line: 1, col_utf16: 6 });
165
166 let text = "\nhello\nworld";
167 let index = LineIndex::new(text);
168 assert_eq!(index.line_col(0.into()), LineCol { line: 0, col_utf16: 0 });
169 assert_eq!(index.line_col(1.into()), LineCol { line: 1, col_utf16: 0 });
170 assert_eq!(index.line_col(2.into()), LineCol { line: 1, col_utf16: 1 });
171 assert_eq!(index.line_col(6.into()), LineCol { line: 1, col_utf16: 5 });
172 assert_eq!(index.line_col(7.into()), LineCol { line: 2, col_utf16: 0 });
173 }
174
175 fn arb_text_with_offset() -> BoxedStrategy<(TextUnit, String)> {
176 arb_text().prop_flat_map(|text| (arb_offset(&text), Just(text))).boxed()
177 }
178
179 fn to_line_col(text: &str, offset: TextUnit) -> LineCol {
180 let mut res = LineCol { line: 0, col_utf16: 0 };
181 for (i, c) in text.char_indices() {
182 if i + c.len_utf8() > offset.to_usize() {
183 // if it's an invalid offset, inside a multibyte char
184 // return as if it was at the start of the char
185 break;
186 }
187 if c == '\n' {
188 res.line += 1;
189 res.col_utf16 = 0;
190 } else {
191 res.col_utf16 += 1;
192 }
193 }
194 res
195 }
196
197 proptest! {
198 #[test]
199 fn test_line_index_proptest((offset, text) in arb_text_with_offset()) {
200 let expected = to_line_col(&text, offset);
201 let line_index = LineIndex::new(&text);
202 let actual = line_index.line_col(offset);
203
204 assert_eq!(actual, expected);
205 }
206 }
207}
208
209#[cfg(test)]
210mod test_utf8_utf16_conv {
211 use super::*;
212
213 #[test]
214 fn test_char_len() {
215 assert_eq!('メ'.len_utf8(), 3);
216 assert_eq!('メ'.len_utf16(), 1);
217 }
218
219 #[test]
220 fn test_empty_index() {
221 let col_index = LineIndex::new(
222 "
223const C: char = 'x';
224",
225 );
226 assert_eq!(col_index.utf16_lines.len(), 0);
227 }
228
229 #[test]
230 fn test_single_char() {
231 let col_index = LineIndex::new(
232 "
233const C: char = 'メ';
234",
235 );
236
237 assert_eq!(col_index.utf16_lines.len(), 1);
238 assert_eq!(col_index.utf16_lines[&1].len(), 1);
239 assert_eq!(col_index.utf16_lines[&1][0], Utf16Char { start: 17.into(), end: 20.into() });
240
241 // UTF-8 to UTF-16, no changes
242 assert_eq!(col_index.utf8_to_utf16_col(1, 15.into()), 15);
243
244 // UTF-8 to UTF-16
245 assert_eq!(col_index.utf8_to_utf16_col(1, 22.into()), 20);
246
247 // UTF-16 to UTF-8, no changes
248 assert_eq!(col_index.utf16_to_utf8_col(1, 15), TextUnit::from(15));
249
250 // UTF-16 to UTF-8
251 assert_eq!(col_index.utf16_to_utf8_col(1, 19), TextUnit::from(21));
252 }
253
254 #[test]
255 fn test_string() {
256 let col_index = LineIndex::new(
257 "
258const C: char = \"メ メ\";
259",
260 );
261
262 assert_eq!(col_index.utf16_lines.len(), 1);
263 assert_eq!(col_index.utf16_lines[&1].len(), 2);
264 assert_eq!(col_index.utf16_lines[&1][0], Utf16Char { start: 17.into(), end: 20.into() });
265 assert_eq!(col_index.utf16_lines[&1][1], Utf16Char { start: 21.into(), end: 24.into() });
266
267 // UTF-8 to UTF-16
268 assert_eq!(col_index.utf8_to_utf16_col(1, 15.into()), 15);
269
270 assert_eq!(col_index.utf8_to_utf16_col(1, 21.into()), 19);
271 assert_eq!(col_index.utf8_to_utf16_col(1, 25.into()), 21);
272
273 assert!(col_index.utf8_to_utf16_col(2, 15.into()) == 15);
274
275 // UTF-16 to UTF-8
276 assert_eq!(col_index.utf16_to_utf8_col(1, 15), TextUnit::from_usize(15));
277
278 assert_eq!(col_index.utf16_to_utf8_col(1, 18), TextUnit::from_usize(20));
279 assert_eq!(col_index.utf16_to_utf8_col(1, 19), TextUnit::from_usize(23));
280
281 assert_eq!(col_index.utf16_to_utf8_col(2, 15), TextUnit::from_usize(15));
282 }
283}
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