aboutsummaryrefslogtreecommitdiff
path: root/helix-lsp/src/lib.rs
blob: 8418896cbb7351503da48cdf06480659a8833a03 (plain) (blame)
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
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
mod client;
pub mod jsonrpc;
mod transport;

pub use client::Client;
pub use futures_executor::block_on;
pub use jsonrpc::Call;
pub use lsp::{Position, Url};
pub use lsp_types as lsp;

use futures_util::stream::select_all::SelectAll;
use helix_core::syntax::{LanguageConfiguration, LanguageServerConfiguration};
use tokio::sync::mpsc::UnboundedReceiver;

use std::{
    collections::{hash_map::Entry, HashMap},
    sync::{
        atomic::{AtomicUsize, Ordering},
        Arc,
    },
};

use serde::{Deserialize, Serialize};
use thiserror::Error;
use tokio_stream::wrappers::UnboundedReceiverStream;

pub type Result<T> = core::result::Result<T, Error>;
type LanguageId = String;

#[derive(Error, Debug)]
pub enum Error {
    #[error("protocol error: {0}")]
    Rpc(#[from] jsonrpc::Error),
    #[error("failed to parse: {0}")]
    Parse(#[from] serde_json::Error),
    #[error("IO Error: {0}")]
    IO(#[from] std::io::Error),
    #[error("request timed out")]
    Timeout,
    #[error("server closed the stream")]
    StreamClosed,
    #[error("Unhandled")]
    Unhandled,
    #[error(transparent)]
    Other(#[from] anyhow::Error),
}

#[derive(Clone, Copy, Debug, Serialize, Deserialize)]
pub enum OffsetEncoding {
    /// UTF-8 code units aka bytes
    #[serde(rename = "utf-8")]
    Utf8,
    /// UTF-16 code units
    #[serde(rename = "utf-16")]
    Utf16,
}

pub mod util {
    use super::*;
    use helix_core::{diagnostic::NumberOrString, Range, Rope, Selection, Tendril, Transaction};

    /// Converts a diagnostic in the document to [`lsp::Diagnostic`].
    ///
    /// Panics when [`pos_to_lsp_pos`] would for an invalid range on the diagnostic.
    pub fn diagnostic_to_lsp_diagnostic(
        doc: &Rope,
        diag: &helix_core::diagnostic::Diagnostic,
        offset_encoding: OffsetEncoding,
    ) -> lsp::Diagnostic {
        use helix_core::diagnostic::Severity::*;

        let range = Range::new(diag.range.start, diag.range.end);
        let severity = diag.severity.map(|s| match s {
            Hint => lsp::DiagnosticSeverity::HINT,
            Info => lsp::DiagnosticSeverity::INFORMATION,
            Warning => lsp::DiagnosticSeverity::WARNING,
            Error => lsp::DiagnosticSeverity::ERROR,
        });

        let code = match diag.code.clone() {
            Some(x) => match x {
                NumberOrString::Number(x) => Some(lsp::NumberOrString::Number(x)),
                NumberOrString::String(x) => Some(lsp::NumberOrString::String(x)),
            },
            None => None,
        };

        let new_tags: Vec<_> = diag
            .tags
            .iter()
            .map(|tag| match tag {
                helix_core::diagnostic::DiagnosticTag::Unnecessary => {
                    lsp::DiagnosticTag::UNNECESSARY
                }
                helix_core::diagnostic::DiagnosticTag::Deprecated => lsp::DiagnosticTag::DEPRECATED,
            })
            .collect();

        let tags = if !new_tags.is_empty() {
            Some(new_tags)
        } else {
            None
        };

        lsp::Diagnostic {
            range: range_to_lsp_range(doc, range, offset_encoding),
            severity,
            code,
            source: diag.source.clone(),
            message: diag.message.to_owned(),
            related_information: None,
            tags,
            data: diag.data.to_owned(),
            ..Default::default()
        }
    }

    /// Converts [`lsp::Position`] to a position in the document.
    ///
    /// Returns `None` if position exceeds document length or an operation overflows.
    pub fn lsp_pos_to_pos(
        doc: &Rope,
        pos: lsp::Position,
        offset_encoding: OffsetEncoding,
    ) -> Option<usize> {
        let pos_line = pos.line as usize;
        if pos_line > doc.len_lines() - 1 {
            return None;
        }

        match offset_encoding {
            OffsetEncoding::Utf8 => {
                let line = doc.line_to_char(pos_line);
                let pos = line.checked_add(pos.character as usize)?;
                if pos <= doc.len_chars() {
                    Some(pos)
                } else {
                    None
                }
            }
            OffsetEncoding::Utf16 => {
                let line = doc.line_to_char(pos_line);
                let line_start = doc.char_to_utf16_cu(line);
                let pos = line_start.checked_add(pos.character as usize)?;
                doc.try_utf16_cu_to_char(pos).ok()
            }
        }
    }

    /// Converts position in the document to [`lsp::Position`].
    ///
    /// Panics when `pos` is out of `doc` bounds or operation overflows.
    pub fn pos_to_lsp_pos(
        doc: &Rope,
        pos: usize,
        offset_encoding: OffsetEncoding,
    ) -> lsp::Position {
        match offset_encoding {
            OffsetEncoding::Utf8 => {
                let line = doc.char_to_line(pos);
                let line_start = doc.line_to_char(line);
                let col = pos - line_start;

                lsp::Position::new(line as u32, col as u32)
            }
            OffsetEncoding::Utf16 => {
                let line = doc.char_to_line(pos);
                let line_start = doc.char_to_utf16_cu(doc.line_to_char(line));
                let col = doc.char_to_utf16_cu(pos) - line_start;

                lsp::Position::new(line as u32, col as u32)
            }
        }
    }

    /// Converts a range in the document to [`lsp::Range`].
    pub fn range_to_lsp_range(
        doc: &Rope,
        range: Range,
        offset_encoding: OffsetEncoding,
    ) -> lsp::Range {
        let start = pos_to_lsp_pos(doc, range.from(), offset_encoding);
        let end = pos_to_lsp_pos(doc, range.to(), offset_encoding);

        lsp::Range::new(start, end)
    }

    pub fn lsp_range_to_range(
        doc: &Rope,
        range: lsp::Range,
        offset_encoding: OffsetEncoding,
    ) -> Option<Range> {
        let start = lsp_pos_to_pos(doc, range.start, offset_encoding)?;
        let end = lsp_pos_to_pos(doc, range.end, offset_encoding)?;

        Some(Range::new(start, end))
    }

    /// Creates a [Transaction] from the [lsp::TextEdit] in a completion response.
    /// The transaction applies the edit to all cursors.
    pub fn generate_transaction_from_completion_edit(
        doc: &Rope,
        selection: &Selection,
        edit: lsp::TextEdit,
        offset_encoding: OffsetEncoding,
    ) -> Transaction {
        let replacement: Option<Tendril> = if edit.new_text.is_empty() {
            None
        } else {
            Some(edit.new_text.into())
        };

        let text = doc.slice(..);
        let primary_cursor = selection.primary().cursor(text);

        let start_offset = match lsp_pos_to_pos(doc, edit.range.start, offset_encoding) {
            Some(start) => start as i128 - primary_cursor as i128,
            None => return Transaction::new(doc),
        };
        let end_offset = match lsp_pos_to_pos(doc, edit.range.end, offset_encoding) {
            Some(end) => end as i128 - primary_cursor as i128,
            None => return Transaction::new(doc),
        };

        Transaction::change_by_selection(doc, selection, |range| {
            let cursor = range.cursor(text);
            (
                (cursor as i128 + start_offset) as usize,
                (cursor as i128 + end_offset) as usize,
                replacement.clone(),
            )
        })
    }

    pub fn generate_transaction_from_edits(
        doc: &Rope,
        mut edits: Vec<lsp::TextEdit>,
        offset_encoding: OffsetEncoding,
    ) -> Transaction {
        // Sort edits by start range, since some LSPs (Omnisharp) send them
        // in reverse order.
        edits.sort_unstable_by_key(|edit| edit.range.start);

        // Generate a diff if the edit is a full document replacement.
        #[allow(clippy::collapsible_if)]
        if edits.len() == 1 {
            let is_document_replacement = edits.first().and_then(|edit| {
                let start = lsp_pos_to_pos(doc, edit.range.start, offset_encoding)?;
                let end = lsp_pos_to_pos(doc, edit.range.end, offset_encoding)?;
                Some(start..end)
            }) == Some(0..doc.len_chars());
            if is_document_replacement {
                let new_text = Rope::from(edits.pop().unwrap().new_text);
                return helix_core::diff::compare_ropes(doc, &new_text);
            }
        }

        Transaction::change(
            doc,
            edits.into_iter().map(|edit| {
                // simplify "" into None for cleaner changesets
                let replacement = if !edit.new_text.is_empty() {
                    Some(edit.new_text.into())
                } else {
                    None
                };

                let start =
                    if let Some(start) = lsp_pos_to_pos(doc, edit.range.start, offset_encoding) {
                        start
                    } else {
                        return (0, 0, None);
                    };
                let end = if let Some(end) = lsp_pos_to_pos(doc, edit.range.end, offset_encoding) {
                    end
                } else {
                    return (0, 0, None);
                };
                (start, end, replacement)
            }),
        )
    }
}

#[derive(Debug, PartialEq, Clone)]
pub enum MethodCall {
    WorkDoneProgressCreate(lsp::WorkDoneProgressCreateParams),
    ApplyWorkspaceEdit(lsp::ApplyWorkspaceEditParams),
    WorkspaceFolders,
    WorkspaceConfiguration(lsp::ConfigurationParams),
}

impl MethodCall {
    pub fn parse(method: &str, params: jsonrpc::Params) -> Result<MethodCall> {
        use lsp::request::Request;
        let request = match method {
            lsp::request::WorkDoneProgressCreate::METHOD => {
                let params: lsp::WorkDoneProgressCreateParams = params.parse()?;
                Self::WorkDoneProgressCreate(params)
            }
            lsp::request::ApplyWorkspaceEdit::METHOD => {
                let params: lsp::ApplyWorkspaceEditParams = params.parse()?;
                Self::ApplyWorkspaceEdit(params)
            }
            lsp::request::WorkspaceFoldersRequest::METHOD => Self::WorkspaceFolders,
            lsp::request::WorkspaceConfiguration::METHOD => {
                let params: lsp::ConfigurationParams = params.parse()?;
                Self::WorkspaceConfiguration(params)
            }
            _ => {
                return Err(Error::Unhandled);
            }
        };
        Ok(request)
    }
}

#[derive(Debug, PartialEq, Clone)]
pub enum Notification {
    // we inject this notification to signal the LSP is ready
    Initialized,
    // and this notification to signal that the LSP exited
    Exit,
    PublishDiagnostics(lsp::PublishDiagnosticsParams),
    ShowMessage(lsp::ShowMessageParams),
    LogMessage(lsp::LogMessageParams),
    ProgressMessage(lsp::ProgressParams),
}

impl Notification {
    pub fn parse(method: &str, params: jsonrpc::Params) -> Result<Notification> {
        use lsp::notification::Notification as _;

        let notification = match method {
            lsp::notification::Initialized::METHOD => Self::Initialized,
            lsp::notification::Exit::METHOD => Self::Exit,
            lsp::notification::PublishDiagnostics::METHOD => {
                let params: lsp::PublishDiagnosticsParams = params.parse()?;
                Self::PublishDiagnostics(params)
            }

            lsp::notification::ShowMessage::METHOD => {
                let params: lsp::ShowMessageParams = params.parse()?;
                Self::ShowMessage(params)
            }
            lsp::notification::LogMessage::METHOD => {
                let params: lsp::LogMessageParams = params.parse()?;
                Self::LogMessage(params)
            }
            lsp::notification::Progress::METHOD => {
                let params: lsp::ProgressParams = params.parse()?;
                Self::ProgressMessage(params)
            }
            _ => {
                return Err(Error::Unhandled);
            }
        };

        Ok(notification)
    }
}

#[derive(Debug)]
pub struct Registry {
    inner: HashMap<LanguageId, (usize, Arc<Client>)>,

    counter: AtomicUsize,
    pub incoming: SelectAll<UnboundedReceiverStream<(usize, Call)>>,
}

impl Default for Registry {
    fn default() -> Self {
        Self::new()
    }
}

impl Registry {
    pub fn new() -> Self {
        Self {
            inner: HashMap::new(),
            counter: AtomicUsize::new(0),
            incoming: SelectAll::new(),
        }
    }

    pub fn get_by_id(&self, id: usize) -> Option<&Client> {
        self.inner
            .values()
            .find(|(client_id, _)| client_id == &id)
            .map(|(_, client)| client.as_ref())
    }

    pub fn remove_by_id(&mut self, id: usize) {
        self.inner.retain(|_, (client_id, _)| client_id != &id)
    }

    pub fn restart(
        &mut self,
        language_config: &LanguageConfiguration,
        doc_path: Option<&std::path::PathBuf>,
    ) -> Result<Option<Arc<Client>>> {
        let config = match &language_config.language_server {
            Some(config) => config,
            None => return Ok(None),
        };

        let scope = language_config.scope.clone();

        match self.inner.entry(scope) {
            Entry::Vacant(_) => Ok(None),
            Entry::Occupied(mut entry) => {
                // initialize a new client
                let id = self.counter.fetch_add(1, Ordering::Relaxed);

                let NewClientResult(client, incoming) =
                    start_client(id, language_config, config, doc_path)?;
                self.incoming.push(UnboundedReceiverStream::new(incoming));

                let (_, old_client) = entry.insert((id, client.clone()));

                tokio::spawn(async move {
                    let _ = old_client.force_shutdown().await;
                });

                Ok(Some(client))
            }
        }
    }

    pub fn get(
        &mut self,
        language_config: &LanguageConfiguration,
        doc_path: Option<&std::path::PathBuf>,
    ) -> Result<Option<Arc<Client>>> {
        let config = match &language_config.language_server {
            Some(config) => config,
            None => return Ok(None),
        };

        match self.inner.entry(language_config.scope.clone()) {
            Entry::Occupied(entry) => Ok(Some(entry.get().1.clone())),
            Entry::Vacant(entry) => {
                // initialize a new client
                let id = self.counter.fetch_add(1, Ordering::Relaxed);

                let NewClientResult(client, incoming) =
                    start_client(id, language_config, config, doc_path)?;
                self.incoming.push(UnboundedReceiverStream::new(incoming));

                entry.insert((id, client.clone()));
                Ok(Some(client))
            }
        }
    }

    pub fn iter_clients(&self) -> impl Iterator<Item = &Arc<Client>> {
        self.inner.values().map(|(_, client)| client)
    }
}

#[derive(Debug)]
pub enum ProgressStatus {
    Created,
    Started(lsp::WorkDoneProgress),
}

impl ProgressStatus {
    pub fn progress(&self) -> Option<&lsp::WorkDoneProgress> {
        match &self {
            ProgressStatus::Created => None,
            ProgressStatus::Started(progress) => Some(progress),
        }
    }
}

#[derive(Default, Debug)]
/// Acts as a container for progress reported by language servers. Each server
/// has a unique id assigned at creation through [`Registry`]. This id is then used
/// to store the progress in this map.
pub struct LspProgressMap(HashMap<usize, HashMap<lsp::ProgressToken, ProgressStatus>>);

impl LspProgressMap {
    pub fn new() -> Self {
        Self::default()
    }

    /// Returns a map of all tokens corresponding to the language server with `id`.
    pub fn progress_map(&self, id: usize) -> Option<&HashMap<lsp::ProgressToken, ProgressStatus>> {
        self.0.get(&id)
    }

    pub fn is_progressing(&self, id: usize) -> bool {
        self.0.get(&id).map(|it| !it.is_empty()).unwrap_or_default()
    }

    /// Returns last progress status for a given server with `id` and `token`.
    pub fn progress(&self, id: usize, token: &lsp::ProgressToken) -> Option<&ProgressStatus> {
        self.0.get(&id).and_then(|values| values.get(token))
    }

    /// Checks if progress `token` for server with `id` is created.
    pub fn is_created(&mut self, id: usize, token: &lsp::ProgressToken) -> bool {
        self.0
            .get(&id)
            .map(|values| values.get(token).is_some())
            .unwrap_or_default()
    }

    pub fn create(&mut self, id: usize, token: lsp::ProgressToken) {
        self.0
            .entry(id)
            .or_default()
            .insert(token, ProgressStatus::Created);
    }

    /// Ends the progress by removing the `token` from server with `id`, if removed returns the value.
    pub fn end_progress(
        &mut self,
        id: usize,
        token: &lsp::ProgressToken,
    ) -> Option<ProgressStatus> {
        self.0.get_mut(&id).and_then(|vals| vals.remove(token))
    }

    /// Updates the progress of `token` for server with `id` to `status`, returns the value replaced or `None`.
    pub fn update(
        &mut self,
        id: usize,
        token: lsp::ProgressToken,
        status: lsp::WorkDoneProgress,
    ) -> Option<ProgressStatus> {
        self.0
            .entry(id)
            .or_default()
            .insert(token, ProgressStatus::Started(status))
    }
}

struct NewClientResult(Arc<Client>, UnboundedReceiver<(usize, Call)>);

/// start_client takes both a LanguageConfiguration and a LanguageServerConfiguration to ensure that
/// it is only called when it makes sense.
fn start_client(
    id: usize,
    config: &LanguageConfiguration,
    ls_config: &LanguageServerConfiguration,
    doc_path: Option<&std::path::PathBuf>,
) -> Result<NewClientResult> {
    let (client, incoming, initialize_notify) = Client::start(
        &ls_config.command,
        &ls_config.args,
        config.config.clone(),
        ls_config.environment.clone(),
        &config.roots,
        id,
        ls_config.timeout,
        doc_path,
    )?;

    let client = Arc::new(client);

    // Initialize the client asynchronously
    let _client = client.clone();
    tokio::spawn(async move {
        use futures_util::TryFutureExt;
        let value = _client
            .capabilities
            .get_or_try_init(|| {
                _client
                    .initialize()
                    .map_ok(|response| response.capabilities)
            })
            .await;

        if let Err(e) = value {
            log::error!("failed to initialize language server: {}", e);
            return;
        }

        // next up, notify<initialized>
        _client
            .notify::<lsp::notification::Initialized>(lsp::InitializedParams {})
            .await
            .unwrap();

        initialize_notify.notify_one();
    });

    Ok(NewClientResult(client, incoming))
}

#[cfg(test)]
mod tests {
    use super::{lsp, util::*, OffsetEncoding};
    use helix_core::Rope;

    #[test]
    fn converts_lsp_pos_to_pos() {
        macro_rules! test_case {
            ($doc:expr, ($x:expr, $y:expr) => $want:expr) => {
                let doc = Rope::from($doc);
                let pos = lsp::Position::new($x, $y);
                assert_eq!($want, lsp_pos_to_pos(&doc, pos, OffsetEncoding::Utf16));
                assert_eq!($want, lsp_pos_to_pos(&doc, pos, OffsetEncoding::Utf8))
            };
        }

        test_case!("", (0, 0) => Some(0));
        test_case!("", (0, 1) => None);
        test_case!("", (1, 0) => None);
        test_case!("\n\n", (0, 0) => Some(0));
        test_case!("\n\n", (1, 0) => Some(1));
        test_case!("\n\n", (1, 1) => Some(2));
        test_case!("\n\n", (2, 0) => Some(2));
        test_case!("\n\n", (3, 0) => None);
        test_case!("test\n\n\n\ncase", (4, 3) => Some(11));
        test_case!("test\n\n\n\ncase", (4, 4) => Some(12));
        test_case!("test\n\n\n\ncase", (4, 5) => None);
        test_case!("", (u32::MAX, u32::MAX) => None);
    }
}