diff options
Diffstat (limited to 'crates/ra_ide_api_light/src/line_index_utils.rs')
-rw-r--r-- | crates/ra_ide_api_light/src/line_index_utils.rs | 330 |
1 files changed, 0 insertions, 330 deletions
diff --git a/crates/ra_ide_api_light/src/line_index_utils.rs b/crates/ra_ide_api_light/src/line_index_utils.rs deleted file mode 100644 index 799a920ad..000000000 --- a/crates/ra_ide_api_light/src/line_index_utils.rs +++ /dev/null | |||
@@ -1,330 +0,0 @@ | |||
1 | use ra_text_edit::{AtomTextEdit, TextEdit}; | ||
2 | use ra_syntax::{TextUnit, TextRange}; | ||
3 | use crate::{LineIndex, LineCol, line_index::Utf16Char}; | ||
4 | |||
5 | #[derive(Debug, Clone)] | ||
6 | enum Step { | ||
7 | Newline(TextUnit), | ||
8 | Utf16Char(TextRange), | ||
9 | } | ||
10 | |||
11 | #[derive(Debug)] | ||
12 | struct LineIndexStepIter<'a> { | ||
13 | line_index: &'a LineIndex, | ||
14 | next_newline_idx: usize, | ||
15 | utf16_chars: Option<(TextUnit, std::slice::Iter<'a, Utf16Char>)>, | ||
16 | } | ||
17 | |||
18 | impl<'a> LineIndexStepIter<'a> { | ||
19 | fn from(line_index: &LineIndex) -> LineIndexStepIter { | ||
20 | let mut x = LineIndexStepIter { line_index, next_newline_idx: 0, utf16_chars: None }; | ||
21 | // skip first newline since it's not real | ||
22 | x.next(); | ||
23 | x | ||
24 | } | ||
25 | } | ||
26 | |||
27 | impl<'a> Iterator for LineIndexStepIter<'a> { | ||
28 | type Item = Step; | ||
29 | fn next(&mut self) -> Option<Step> { | ||
30 | self.utf16_chars | ||
31 | .as_mut() | ||
32 | .and_then(|(newline, x)| { | ||
33 | let x = x.next()?; | ||
34 | Some(Step::Utf16Char(TextRange::from_to(*newline + x.start, *newline + x.end))) | ||
35 | }) | ||
36 | .or_else(|| { | ||
37 | let next_newline = *self.line_index.newlines.get(self.next_newline_idx)?; | ||
38 | self.utf16_chars = self | ||
39 | .line_index | ||
40 | .utf16_lines | ||
41 | .get(&(self.next_newline_idx as u32)) | ||
42 | .map(|x| (next_newline, x.iter())); | ||
43 | self.next_newline_idx += 1; | ||
44 | Some(Step::Newline(next_newline)) | ||
45 | }) | ||
46 | } | ||
47 | } | ||
48 | |||
49 | #[derive(Debug)] | ||
50 | struct OffsetStepIter<'a> { | ||
51 | text: &'a str, | ||
52 | offset: TextUnit, | ||
53 | } | ||
54 | |||
55 | impl<'a> Iterator for OffsetStepIter<'a> { | ||
56 | type Item = Step; | ||
57 | fn next(&mut self) -> Option<Step> { | ||
58 | let (next, next_offset) = self | ||
59 | .text | ||
60 | .char_indices() | ||
61 | .filter_map(|(i, c)| { | ||
62 | if c == '\n' { | ||
63 | let next_offset = self.offset + TextUnit::from_usize(i + 1); | ||
64 | let next = Step::Newline(next_offset); | ||
65 | Some((next, next_offset)) | ||
66 | } else { | ||
67 | let char_len = TextUnit::of_char(c); | ||
68 | if char_len.to_usize() > 1 { | ||
69 | let start = self.offset + TextUnit::from_usize(i); | ||
70 | let end = start + char_len; | ||
71 | let next = Step::Utf16Char(TextRange::from_to(start, end)); | ||
72 | let next_offset = end; | ||
73 | Some((next, next_offset)) | ||
74 | } else { | ||
75 | None | ||
76 | } | ||
77 | } | ||
78 | }) | ||
79 | .next()?; | ||
80 | let next_idx = (next_offset - self.offset).to_usize(); | ||
81 | self.text = &self.text[next_idx..]; | ||
82 | self.offset = next_offset; | ||
83 | Some(next) | ||
84 | } | ||
85 | } | ||
86 | |||
87 | #[derive(Debug)] | ||
88 | enum NextSteps<'a> { | ||
89 | Use, | ||
90 | ReplaceMany(OffsetStepIter<'a>), | ||
91 | AddMany(OffsetStepIter<'a>), | ||
92 | } | ||
93 | |||
94 | #[derive(Debug)] | ||
95 | struct TranslatedEdit<'a> { | ||
96 | delete: TextRange, | ||
97 | insert: &'a str, | ||
98 | diff: i64, | ||
99 | } | ||
100 | |||
101 | struct Edits<'a> { | ||
102 | edits: &'a [AtomTextEdit], | ||
103 | current: Option<TranslatedEdit<'a>>, | ||
104 | acc_diff: i64, | ||
105 | } | ||
106 | |||
107 | impl<'a> Edits<'a> { | ||
108 | fn from_text_edit(text_edit: &'a TextEdit) -> Edits<'a> { | ||
109 | let mut x = Edits { edits: text_edit.as_atoms(), current: None, acc_diff: 0 }; | ||
110 | x.advance_edit(); | ||
111 | x | ||
112 | } | ||
113 | fn advance_edit(&mut self) { | ||
114 | self.acc_diff += self.current.as_ref().map_or(0, |x| x.diff); | ||
115 | match self.edits.split_first() { | ||
116 | Some((next, rest)) => { | ||
117 | let delete = self.translate_range(next.delete); | ||
118 | let diff = next.insert.len() as i64 - next.delete.len().to_usize() as i64; | ||
119 | self.current = Some(TranslatedEdit { delete, insert: &next.insert, diff }); | ||
120 | self.edits = rest; | ||
121 | } | ||
122 | None => { | ||
123 | self.current = None; | ||
124 | } | ||
125 | } | ||
126 | } | ||
127 | |||
128 | fn next_inserted_steps(&mut self) -> Option<OffsetStepIter<'a>> { | ||
129 | let cur = self.current.as_ref()?; | ||
130 | let res = Some(OffsetStepIter { offset: cur.delete.start(), text: &cur.insert }); | ||
131 | self.advance_edit(); | ||
132 | res | ||
133 | } | ||
134 | |||
135 | fn next_steps(&mut self, step: &Step) -> NextSteps { | ||
136 | let step_pos = match step { | ||
137 | &Step::Newline(n) => n, | ||
138 | &Step::Utf16Char(r) => r.end(), | ||
139 | }; | ||
140 | let res = match &mut self.current { | ||
141 | Some(edit) => { | ||
142 | if step_pos <= edit.delete.start() { | ||
143 | NextSteps::Use | ||
144 | } else if step_pos <= edit.delete.end() { | ||
145 | let iter = OffsetStepIter { offset: edit.delete.start(), text: &edit.insert }; | ||
146 | // empty slice to avoid returning steps again | ||
147 | edit.insert = &edit.insert[edit.insert.len()..]; | ||
148 | NextSteps::ReplaceMany(iter) | ||
149 | } else { | ||
150 | let iter = OffsetStepIter { offset: edit.delete.start(), text: &edit.insert }; | ||
151 | // empty slice to avoid returning steps again | ||
152 | edit.insert = &edit.insert[edit.insert.len()..]; | ||
153 | self.advance_edit(); | ||
154 | NextSteps::AddMany(iter) | ||
155 | } | ||
156 | } | ||
157 | None => NextSteps::Use, | ||
158 | }; | ||
159 | res | ||
160 | } | ||
161 | |||
162 | fn translate_range(&self, range: TextRange) -> TextRange { | ||
163 | if self.acc_diff == 0 { | ||
164 | range | ||
165 | } else { | ||
166 | let start = self.translate(range.start()); | ||
167 | let end = self.translate(range.end()); | ||
168 | TextRange::from_to(start, end) | ||
169 | } | ||
170 | } | ||
171 | |||
172 | fn translate(&self, x: TextUnit) -> TextUnit { | ||
173 | if self.acc_diff == 0 { | ||
174 | x | ||
175 | } else { | ||
176 | TextUnit::from((x.to_usize() as i64 + self.acc_diff) as u32) | ||
177 | } | ||
178 | } | ||
179 | |||
180 | fn translate_step(&self, x: &Step) -> Step { | ||
181 | if self.acc_diff == 0 { | ||
182 | x.clone() | ||
183 | } else { | ||
184 | match x { | ||
185 | &Step::Newline(n) => Step::Newline(self.translate(n)), | ||
186 | &Step::Utf16Char(r) => Step::Utf16Char(self.translate_range(r)), | ||
187 | } | ||
188 | } | ||
189 | } | ||
190 | } | ||
191 | |||
192 | #[derive(Debug)] | ||
193 | struct RunningLineCol { | ||
194 | line: u32, | ||
195 | last_newline: TextUnit, | ||
196 | col_adjust: TextUnit, | ||
197 | } | ||
198 | |||
199 | impl RunningLineCol { | ||
200 | fn new() -> RunningLineCol { | ||
201 | RunningLineCol { line: 0, last_newline: TextUnit::from(0), col_adjust: TextUnit::from(0) } | ||
202 | } | ||
203 | |||
204 | fn to_line_col(&self, offset: TextUnit) -> LineCol { | ||
205 | LineCol { | ||
206 | line: self.line, | ||
207 | col_utf16: ((offset - self.last_newline) - self.col_adjust).into(), | ||
208 | } | ||
209 | } | ||
210 | |||
211 | fn add_line(&mut self, newline: TextUnit) { | ||
212 | self.line += 1; | ||
213 | self.last_newline = newline; | ||
214 | self.col_adjust = TextUnit::from(0); | ||
215 | } | ||
216 | |||
217 | fn adjust_col(&mut self, range: &TextRange) { | ||
218 | self.col_adjust += range.len() - TextUnit::from(1); | ||
219 | } | ||
220 | } | ||
221 | |||
222 | pub fn translate_offset_with_edit( | ||
223 | line_index: &LineIndex, | ||
224 | offset: TextUnit, | ||
225 | text_edit: &TextEdit, | ||
226 | ) -> LineCol { | ||
227 | let mut state = Edits::from_text_edit(&text_edit); | ||
228 | |||
229 | let mut res = RunningLineCol::new(); | ||
230 | |||
231 | macro_rules! test_step { | ||
232 | ($x:ident) => { | ||
233 | match &$x { | ||
234 | Step::Newline(n) => { | ||
235 | if offset < *n { | ||
236 | return res.to_line_col(offset); | ||
237 | } else { | ||
238 | res.add_line(*n); | ||
239 | } | ||
240 | } | ||
241 | Step::Utf16Char(x) => { | ||
242 | if offset < x.end() { | ||
243 | // if the offset is inside a multibyte char it's invalid | ||
244 | // clamp it to the start of the char | ||
245 | let clamp = offset.min(x.start()); | ||
246 | return res.to_line_col(clamp); | ||
247 | } else { | ||
248 | res.adjust_col(x); | ||
249 | } | ||
250 | } | ||
251 | } | ||
252 | }; | ||
253 | } | ||
254 | |||
255 | for orig_step in LineIndexStepIter::from(line_index) { | ||
256 | loop { | ||
257 | let translated_step = state.translate_step(&orig_step); | ||
258 | match state.next_steps(&translated_step) { | ||
259 | NextSteps::Use => { | ||
260 | test_step!(translated_step); | ||
261 | break; | ||
262 | } | ||
263 | NextSteps::ReplaceMany(ns) => { | ||
264 | for n in ns { | ||
265 | test_step!(n); | ||
266 | } | ||
267 | break; | ||
268 | } | ||
269 | NextSteps::AddMany(ns) => { | ||
270 | for n in ns { | ||
271 | test_step!(n); | ||
272 | } | ||
273 | } | ||
274 | } | ||
275 | } | ||
276 | } | ||
277 | |||
278 | loop { | ||
279 | match state.next_inserted_steps() { | ||
280 | None => break, | ||
281 | Some(ns) => { | ||
282 | for n in ns { | ||
283 | test_step!(n); | ||
284 | } | ||
285 | } | ||
286 | } | ||
287 | } | ||
288 | |||
289 | res.to_line_col(offset) | ||
290 | } | ||
291 | |||
292 | #[cfg(test)] | ||
293 | mod test { | ||
294 | use super::*; | ||
295 | use proptest::{prelude::*, proptest}; | ||
296 | use crate::line_index; | ||
297 | use ra_text_edit::test_utils::{arb_offset, arb_text_with_edit}; | ||
298 | use ra_text_edit::TextEdit; | ||
299 | |||
300 | #[derive(Debug)] | ||
301 | struct ArbTextWithEditAndOffset { | ||
302 | text: String, | ||
303 | edit: TextEdit, | ||
304 | edited_text: String, | ||
305 | offset: TextUnit, | ||
306 | } | ||
307 | |||
308 | fn arb_text_with_edit_and_offset() -> BoxedStrategy<ArbTextWithEditAndOffset> { | ||
309 | arb_text_with_edit() | ||
310 | .prop_flat_map(|x| { | ||
311 | let edited_text = x.edit.apply(&x.text); | ||
312 | let arb_offset = arb_offset(&edited_text); | ||
313 | (Just(x), Just(edited_text), arb_offset).prop_map(|(x, edited_text, offset)| { | ||
314 | ArbTextWithEditAndOffset { text: x.text, edit: x.edit, edited_text, offset } | ||
315 | }) | ||
316 | }) | ||
317 | .boxed() | ||
318 | } | ||
319 | |||
320 | proptest! { | ||
321 | #[test] | ||
322 | fn test_translate_offset_with_edit(x in arb_text_with_edit_and_offset()) { | ||
323 | let expected = line_index::to_line_col(&x.edited_text, x.offset); | ||
324 | let line_index = LineIndex::new(&x.text); | ||
325 | let actual = translate_offset_with_edit(&line_index, x.offset, &x.edit); | ||
326 | |||
327 | assert_eq!(actual, expected); | ||
328 | } | ||
329 | } | ||
330 | } | ||