forked from golang/tools
/
editor.go
1208 lines (1102 loc) · 35.6 KB
/
editor.go
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
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
// Copyright 2020 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package fake
import (
"bufio"
"context"
"fmt"
"os"
"path/filepath"
"regexp"
"strings"
"sync"
"github.com/jhump/golang-x-tools/internal/jsonrpc2"
"github.com/jhump/golang-x-tools/internal/lsp/command"
"github.com/jhump/golang-x-tools/internal/lsp/protocol"
"github.com/jhump/golang-x-tools/internal/span"
errors "golang.org/x/xerrors"
)
// Editor is a fake editor client. It keeps track of client state and can be
// used for writing LSP tests.
type Editor struct {
Config EditorConfig
// Server, client, and sandbox are concurrency safe and written only
// at construction time, so do not require synchronization.
Server protocol.Server
serverConn jsonrpc2.Conn
client *Client
sandbox *Sandbox
defaultEnv map[string]string
// Since this editor is intended just for testing, we use very coarse
// locking.
mu sync.Mutex
// Editor state.
buffers map[string]buffer
// Capabilities / Options
serverCapabilities protocol.ServerCapabilities
// Call metrics for the purpose of expectations. This is done in an ad-hoc
// manner for now. Perhaps in the future we should do something more
// systematic. Guarded with a separate mutex as calls may need to be accessed
// asynchronously via callbacks into the Editor.
callsMu sync.Mutex
calls CallCounts
}
type CallCounts struct {
DidOpen, DidChange, DidSave, DidChangeWatchedFiles, DidClose uint64
}
type buffer struct {
windowsLineEndings bool
version int
path string
lines []string
dirty bool
}
func (b buffer) text() string {
eol := "\n"
if b.windowsLineEndings {
eol = "\r\n"
}
return strings.Join(b.lines, eol)
}
// EditorConfig configures the editor's LSP session. This is similar to
// source.UserOptions, but we use a separate type here so that we expose only
// that configuration which we support.
//
// The zero value for EditorConfig should correspond to its defaults.
type EditorConfig struct {
Env map[string]string
BuildFlags []string
// CodeLenses is a map defining whether codelens are enabled, keyed by the
// codeLens command. CodeLenses which are not present in this map are left in
// their default state.
CodeLenses map[string]bool
// SymbolMatcher is the config associated with the "symbolMatcher" gopls
// config option.
SymbolMatcher, SymbolStyle *string
// LimitWorkspaceScope is true if the user does not want to expand their
// workspace scope to the entire module.
LimitWorkspaceScope bool
// WorkspaceFolders is the workspace folders to configure on the LSP server,
// relative to the sandbox workdir.
//
// As a special case, if WorkspaceFolders is nil the editor defaults to
// configuring a single workspace folder corresponding to the workdir root.
// To explicitly send no workspace folders, use an empty (non-nil) slice.
WorkspaceFolders []string
// EnableStaticcheck enables staticcheck analyzers.
EnableStaticcheck bool
// AllExperiments sets the "allExperiments" configuration, which enables
// all of gopls's opt-in settings.
AllExperiments bool
// Whether to send the current process ID, for testing data that is joined to
// the PID. This can only be set by one test.
SendPID bool
// Whether to edit files with windows line endings.
WindowsLineEndings bool
ImportShortcut string
DirectoryFilters []string
VerboseOutput bool
ExperimentalUseInvalidMetadata bool
}
// NewEditor Creates a new Editor.
func NewEditor(sandbox *Sandbox, config EditorConfig) *Editor {
return &Editor{
buffers: make(map[string]buffer),
sandbox: sandbox,
defaultEnv: sandbox.GoEnv(),
Config: config,
}
}
// Connect configures the editor to communicate with an LSP server on conn. It
// is not concurrency safe, and should be called at most once, before using the
// editor.
//
// It returns the editor, so that it may be called as follows:
// editor, err := NewEditor(s).Connect(ctx, conn)
func (e *Editor) Connect(ctx context.Context, conn jsonrpc2.Conn, hooks ClientHooks) (*Editor, error) {
e.serverConn = conn
e.Server = protocol.ServerDispatcher(conn)
e.client = &Client{editor: e, hooks: hooks}
conn.Go(ctx,
protocol.Handlers(
protocol.ClientHandler(e.client,
jsonrpc2.MethodNotFound)))
if err := e.initialize(ctx, e.Config.WorkspaceFolders); err != nil {
return nil, err
}
e.sandbox.Workdir.AddWatcher(e.onFileChanges)
return e, nil
}
func (e *Editor) Stats() CallCounts {
e.callsMu.Lock()
defer e.callsMu.Unlock()
return e.calls
}
// Shutdown issues the 'shutdown' LSP notification.
func (e *Editor) Shutdown(ctx context.Context) error {
if e.Server != nil {
if err := e.Server.Shutdown(ctx); err != nil {
return errors.Errorf("Shutdown: %w", err)
}
}
return nil
}
// Exit issues the 'exit' LSP notification.
func (e *Editor) Exit(ctx context.Context) error {
if e.Server != nil {
// Not all LSP clients issue the exit RPC, but we do so here to ensure that
// we gracefully handle it on multi-session servers.
if err := e.Server.Exit(ctx); err != nil {
return errors.Errorf("Exit: %w", err)
}
}
return nil
}
// Close issues the shutdown and exit sequence an editor should.
func (e *Editor) Close(ctx context.Context) error {
if err := e.Shutdown(ctx); err != nil {
return err
}
if err := e.Exit(ctx); err != nil {
return err
}
// called close on the editor should result in the connection closing
select {
case <-e.serverConn.Done():
// connection closed itself
return nil
case <-ctx.Done():
return errors.Errorf("connection not closed: %w", ctx.Err())
}
}
// Client returns the LSP client for this editor.
func (e *Editor) Client() *Client {
return e.client
}
func (e *Editor) overlayEnv() map[string]string {
env := make(map[string]string)
for k, v := range e.defaultEnv {
v = strings.ReplaceAll(v, "$SANDBOX_WORKDIR", e.sandbox.Workdir.RootURI().SpanURI().Filename())
env[k] = v
}
for k, v := range e.Config.Env {
v = strings.ReplaceAll(v, "$SANDBOX_WORKDIR", e.sandbox.Workdir.RootURI().SpanURI().Filename())
env[k] = v
}
return env
}
func (e *Editor) configuration() map[string]interface{} {
config := map[string]interface{}{
"verboseWorkDoneProgress": true,
"env": e.overlayEnv(),
"expandWorkspaceToModule": !e.Config.LimitWorkspaceScope,
"completionBudget": "10s",
}
if e.Config.BuildFlags != nil {
config["buildFlags"] = e.Config.BuildFlags
}
if e.Config.DirectoryFilters != nil {
config["directoryFilters"] = e.Config.DirectoryFilters
}
if e.Config.ExperimentalUseInvalidMetadata {
config["experimentalUseInvalidMetadata"] = true
}
if e.Config.CodeLenses != nil {
config["codelenses"] = e.Config.CodeLenses
}
if e.Config.SymbolMatcher != nil {
config["symbolMatcher"] = *e.Config.SymbolMatcher
}
if e.Config.SymbolStyle != nil {
config["symbolStyle"] = *e.Config.SymbolStyle
}
if e.Config.EnableStaticcheck {
config["staticcheck"] = true
}
if e.Config.AllExperiments {
config["allExperiments"] = true
}
if e.Config.VerboseOutput {
config["verboseOutput"] = true
}
if e.Config.ImportShortcut != "" {
config["importShortcut"] = e.Config.ImportShortcut
}
config["diagnosticsDelay"] = "10ms"
// ExperimentalWorkspaceModule is only set as a mode, not a configuration.
return config
}
func (e *Editor) initialize(ctx context.Context, workspaceFolders []string) error {
params := &protocol.ParamInitialize{}
params.ClientInfo.Name = "fakeclient"
params.ClientInfo.Version = "v1.0.0"
if workspaceFolders == nil {
workspaceFolders = []string{string(e.sandbox.Workdir.RelativeTo)}
}
for _, folder := range workspaceFolders {
params.WorkspaceFolders = append(params.WorkspaceFolders, protocol.WorkspaceFolder{
URI: string(e.sandbox.Workdir.URI(folder)),
Name: filepath.Base(folder),
})
}
params.Capabilities.Workspace.Configuration = true
params.Capabilities.Window.WorkDoneProgress = true
// TODO: set client capabilities
params.Capabilities.TextDocument.Completion.CompletionItem.TagSupport.ValueSet = []protocol.CompletionItemTag{protocol.ComplDeprecated}
params.InitializationOptions = e.configuration()
if e.Config.SendPID {
params.ProcessID = int32(os.Getpid())
}
params.Capabilities.TextDocument.Completion.CompletionItem.SnippetSupport = true
// This is a bit of a hack, since the fake editor doesn't actually support
// watching changed files that match a specific glob pattern. However, the
// editor does send didChangeWatchedFiles notifications, so set this to
// true.
params.Capabilities.Workspace.DidChangeWatchedFiles.DynamicRegistration = true
params.Trace = "messages"
// TODO: support workspace folders.
if e.Server != nil {
resp, err := e.Server.Initialize(ctx, params)
if err != nil {
return errors.Errorf("initialize: %w", err)
}
e.mu.Lock()
e.serverCapabilities = resp.Capabilities
e.mu.Unlock()
if err := e.Server.Initialized(ctx, &protocol.InitializedParams{}); err != nil {
return errors.Errorf("initialized: %w", err)
}
}
// TODO: await initial configuration here, or expect gopls to manage that?
return nil
}
// onFileChanges is registered to be called by the Workdir on any writes that
// go through the Workdir API. It is called synchronously by the Workdir.
func (e *Editor) onFileChanges(ctx context.Context, evts []FileEvent) {
if e.Server == nil {
return
}
// e may be locked when onFileChanges is called, but it is important that we
// synchronously increment this counter so that we can subsequently assert on
// the number of expected DidChangeWatchedFiles calls.
e.callsMu.Lock()
e.calls.DidChangeWatchedFiles++
e.callsMu.Unlock()
// Since e may be locked, we must run this mutation asynchronously.
go func() {
e.mu.Lock()
defer e.mu.Unlock()
var lspevts []protocol.FileEvent
for _, evt := range evts {
// Always send an on-disk change, even for events that seem useless
// because they're shadowed by an open buffer.
lspevts = append(lspevts, evt.ProtocolEvent)
if buf, ok := e.buffers[evt.Path]; ok {
// Following VS Code, don't honor deletions or changes to dirty buffers.
if buf.dirty || evt.ProtocolEvent.Type == protocol.Deleted {
continue
}
content, err := e.sandbox.Workdir.ReadFile(evt.Path)
if err != nil {
continue // A race with some other operation.
}
// No need to update if the buffer content hasn't changed.
if content == buf.text() {
continue
}
// During shutdown, this call will fail. Ignore the error.
_ = e.setBufferContentLocked(ctx, evt.Path, false, lines(content), nil)
}
}
e.Server.DidChangeWatchedFiles(ctx, &protocol.DidChangeWatchedFilesParams{
Changes: lspevts,
})
}()
}
// OpenFile creates a buffer for the given workdir-relative file.
func (e *Editor) OpenFile(ctx context.Context, path string) error {
content, err := e.sandbox.Workdir.ReadFile(path)
if err != nil {
return err
}
return e.createBuffer(ctx, path, false, content)
}
func textDocumentItem(wd *Workdir, buf buffer) protocol.TextDocumentItem {
uri := wd.URI(buf.path)
languageID := ""
if strings.HasSuffix(buf.path, ".go") {
// TODO: what about go.mod files? What is their language ID?
languageID = "go"
}
return protocol.TextDocumentItem{
URI: uri,
LanguageID: languageID,
Version: int32(buf.version),
Text: buf.text(),
}
}
// CreateBuffer creates a new unsaved buffer corresponding to the workdir path,
// containing the given textual content.
func (e *Editor) CreateBuffer(ctx context.Context, path, content string) error {
return e.createBuffer(ctx, path, true, content)
}
func (e *Editor) createBuffer(ctx context.Context, path string, dirty bool, content string) error {
buf := buffer{
windowsLineEndings: e.Config.WindowsLineEndings,
version: 1,
path: path,
lines: lines(content),
dirty: dirty,
}
e.mu.Lock()
defer e.mu.Unlock()
e.buffers[path] = buf
item := textDocumentItem(e.sandbox.Workdir, buf)
if e.Server != nil {
if err := e.Server.DidOpen(ctx, &protocol.DidOpenTextDocumentParams{
TextDocument: item,
}); err != nil {
return errors.Errorf("DidOpen: %w", err)
}
e.callsMu.Lock()
e.calls.DidOpen++
e.callsMu.Unlock()
}
return nil
}
// lines returns line-ending agnostic line representation of content.
func lines(content string) []string {
lines := strings.Split(content, "\n")
for i, l := range lines {
lines[i] = strings.TrimSuffix(l, "\r")
}
return lines
}
// CloseBuffer removes the current buffer (regardless of whether it is saved).
func (e *Editor) CloseBuffer(ctx context.Context, path string) error {
e.mu.Lock()
_, ok := e.buffers[path]
if !ok {
e.mu.Unlock()
return ErrUnknownBuffer
}
delete(e.buffers, path)
e.mu.Unlock()
if e.Server != nil {
if err := e.Server.DidClose(ctx, &protocol.DidCloseTextDocumentParams{
TextDocument: e.textDocumentIdentifier(path),
}); err != nil {
return errors.Errorf("DidClose: %w", err)
}
e.callsMu.Lock()
e.calls.DidClose++
e.callsMu.Unlock()
}
return nil
}
func (e *Editor) textDocumentIdentifier(path string) protocol.TextDocumentIdentifier {
return protocol.TextDocumentIdentifier{
URI: e.sandbox.Workdir.URI(path),
}
}
// SaveBuffer writes the content of the buffer specified by the given path to
// the filesystem.
func (e *Editor) SaveBuffer(ctx context.Context, path string) error {
if err := e.OrganizeImports(ctx, path); err != nil {
return errors.Errorf("organizing imports before save: %w", err)
}
if err := e.FormatBuffer(ctx, path); err != nil {
return errors.Errorf("formatting before save: %w", err)
}
return e.SaveBufferWithoutActions(ctx, path)
}
func (e *Editor) SaveBufferWithoutActions(ctx context.Context, path string) error {
e.mu.Lock()
defer e.mu.Unlock()
buf, ok := e.buffers[path]
if !ok {
return fmt.Errorf(fmt.Sprintf("unknown buffer: %q", path))
}
content := buf.text()
includeText := false
syncOptions, ok := e.serverCapabilities.TextDocumentSync.(protocol.TextDocumentSyncOptions)
if ok {
includeText = syncOptions.Save.IncludeText
}
docID := e.textDocumentIdentifier(buf.path)
if e.Server != nil {
if err := e.Server.WillSave(ctx, &protocol.WillSaveTextDocumentParams{
TextDocument: docID,
Reason: protocol.Manual,
}); err != nil {
return errors.Errorf("WillSave: %w", err)
}
}
if err := e.sandbox.Workdir.WriteFile(ctx, path, content); err != nil {
return errors.Errorf("writing %q: %w", path, err)
}
buf.dirty = false
e.buffers[path] = buf
if e.Server != nil {
params := &protocol.DidSaveTextDocumentParams{
TextDocument: docID,
}
if includeText {
params.Text = &content
}
if err := e.Server.DidSave(ctx, params); err != nil {
return errors.Errorf("DidSave: %w", err)
}
e.callsMu.Lock()
e.calls.DidSave++
e.callsMu.Unlock()
}
return nil
}
// contentPosition returns the (Line, Column) position corresponding to offset
// in the buffer referenced by path.
func contentPosition(content string, offset int) (Pos, error) {
scanner := bufio.NewScanner(strings.NewReader(content))
start := 0
line := 0
for scanner.Scan() {
end := start + len([]rune(scanner.Text())) + 1
if offset < end {
return Pos{Line: line, Column: offset - start}, nil
}
start = end
line++
}
if err := scanner.Err(); err != nil {
return Pos{}, errors.Errorf("scanning content: %w", err)
}
// Scan() will drop the last line if it is empty. Correct for this.
if (strings.HasSuffix(content, "\n") || content == "") && offset == start {
return Pos{Line: line, Column: 0}, nil
}
return Pos{}, fmt.Errorf("position %d out of bounds in %q (line = %d, start = %d)", offset, content, line, start)
}
// ErrNoMatch is returned if a regexp search fails.
var (
ErrNoMatch = errors.New("no match")
ErrUnknownBuffer = errors.New("unknown buffer")
)
// regexpRange returns the start and end of the first occurrence of either re
// or its singular subgroup. It returns ErrNoMatch if the regexp doesn't match.
func regexpRange(content, re string) (Pos, Pos, error) {
content = normalizeEOL(content)
var start, end int
rec, err := regexp.Compile(re)
if err != nil {
return Pos{}, Pos{}, err
}
indexes := rec.FindStringSubmatchIndex(content)
if indexes == nil {
return Pos{}, Pos{}, ErrNoMatch
}
switch len(indexes) {
case 2:
// no subgroups: return the range of the regexp expression
start, end = indexes[0], indexes[1]
case 4:
// one subgroup: return its range
start, end = indexes[2], indexes[3]
default:
return Pos{}, Pos{}, fmt.Errorf("invalid search regexp %q: expect either 0 or 1 subgroups, got %d", re, len(indexes)/2-1)
}
startPos, err := contentPosition(content, start)
if err != nil {
return Pos{}, Pos{}, err
}
endPos, err := contentPosition(content, end)
if err != nil {
return Pos{}, Pos{}, err
}
return startPos, endPos, nil
}
func normalizeEOL(content string) string {
return strings.Join(lines(content), "\n")
}
// RegexpRange returns the first range in the buffer bufName matching re. See
// RegexpSearch for more information on matching.
func (e *Editor) RegexpRange(bufName, re string) (Pos, Pos, error) {
e.mu.Lock()
defer e.mu.Unlock()
buf, ok := e.buffers[bufName]
if !ok {
return Pos{}, Pos{}, ErrUnknownBuffer
}
return regexpRange(buf.text(), re)
}
// RegexpSearch returns the position of the first match for re in the buffer
// bufName. For convenience, RegexpSearch supports the following two modes:
// 1. If re has no subgroups, return the position of the match for re itself.
// 2. If re has one subgroup, return the position of the first subgroup.
// It returns an error re is invalid, has more than one subgroup, or doesn't
// match the buffer.
func (e *Editor) RegexpSearch(bufName, re string) (Pos, error) {
start, _, err := e.RegexpRange(bufName, re)
return start, err
}
// RegexpReplace edits the buffer corresponding to path by replacing the first
// instance of re, or its first subgroup, with the replace text. See
// RegexpSearch for more explanation of these two modes.
// It returns an error if re is invalid, has more than one subgroup, or doesn't
// match the buffer.
func (e *Editor) RegexpReplace(ctx context.Context, path, re, replace string) error {
e.mu.Lock()
defer e.mu.Unlock()
buf, ok := e.buffers[path]
if !ok {
return ErrUnknownBuffer
}
content := buf.text()
start, end, err := regexpRange(content, re)
if err != nil {
return err
}
return e.editBufferLocked(ctx, path, []Edit{{
Start: start,
End: end,
Text: replace,
}})
}
// EditBuffer applies the given test edits to the buffer identified by path.
func (e *Editor) EditBuffer(ctx context.Context, path string, edits []Edit) error {
e.mu.Lock()
defer e.mu.Unlock()
return e.editBufferLocked(ctx, path, edits)
}
func (e *Editor) SetBufferContent(ctx context.Context, path, content string) error {
e.mu.Lock()
defer e.mu.Unlock()
lines := lines(content)
return e.setBufferContentLocked(ctx, path, true, lines, nil)
}
// HasBuffer reports whether the file name is open in the editor.
func (e *Editor) HasBuffer(name string) bool {
e.mu.Lock()
defer e.mu.Unlock()
_, ok := e.buffers[name]
return ok
}
// BufferText returns the content of the buffer with the given name.
func (e *Editor) BufferText(name string) string {
e.mu.Lock()
defer e.mu.Unlock()
return e.buffers[name].text()
}
// BufferVersion returns the current version of the buffer corresponding to
// name (or 0 if it is not being edited).
func (e *Editor) BufferVersion(name string) int {
e.mu.Lock()
defer e.mu.Unlock()
return e.buffers[name].version
}
func (e *Editor) editBufferLocked(ctx context.Context, path string, edits []Edit) error {
buf, ok := e.buffers[path]
if !ok {
return fmt.Errorf("unknown buffer %q", path)
}
content := make([]string, len(buf.lines))
copy(content, buf.lines)
content, err := editContent(content, edits)
if err != nil {
return err
}
return e.setBufferContentLocked(ctx, path, true, content, edits)
}
func (e *Editor) setBufferContentLocked(ctx context.Context, path string, dirty bool, content []string, fromEdits []Edit) error {
buf, ok := e.buffers[path]
if !ok {
return fmt.Errorf("unknown buffer %q", path)
}
buf.lines = content
buf.version++
buf.dirty = dirty
e.buffers[path] = buf
// A simple heuristic: if there is only one edit, send it incrementally.
// Otherwise, send the entire content.
var evts []protocol.TextDocumentContentChangeEvent
if len(fromEdits) == 1 {
evts = append(evts, fromEdits[0].toProtocolChangeEvent())
} else {
evts = append(evts, protocol.TextDocumentContentChangeEvent{
Text: buf.text(),
})
}
params := &protocol.DidChangeTextDocumentParams{
TextDocument: protocol.VersionedTextDocumentIdentifier{
Version: int32(buf.version),
TextDocumentIdentifier: e.textDocumentIdentifier(buf.path),
},
ContentChanges: evts,
}
if e.Server != nil {
if err := e.Server.DidChange(ctx, params); err != nil {
return errors.Errorf("DidChange: %w", err)
}
e.callsMu.Lock()
e.calls.DidChange++
e.callsMu.Unlock()
}
return nil
}
// GoToDefinition jumps to the definition of the symbol at the given position
// in an open buffer. It returns the path and position of the resulting jump.
func (e *Editor) GoToDefinition(ctx context.Context, path string, pos Pos) (string, Pos, error) {
if err := e.checkBufferPosition(path, pos); err != nil {
return "", Pos{}, err
}
params := &protocol.DefinitionParams{}
params.TextDocument.URI = e.sandbox.Workdir.URI(path)
params.Position = pos.ToProtocolPosition()
resp, err := e.Server.Definition(ctx, params)
if err != nil {
return "", Pos{}, errors.Errorf("definition: %w", err)
}
return e.extractFirstPathAndPos(ctx, resp)
}
// GoToTypeDefinition jumps to the type definition of the symbol at the given position
// in an open buffer.
func (e *Editor) GoToTypeDefinition(ctx context.Context, path string, pos Pos) (string, Pos, error) {
if err := e.checkBufferPosition(path, pos); err != nil {
return "", Pos{}, err
}
params := &protocol.TypeDefinitionParams{}
params.TextDocument.URI = e.sandbox.Workdir.URI(path)
params.Position = pos.ToProtocolPosition()
resp, err := e.Server.TypeDefinition(ctx, params)
if err != nil {
return "", Pos{}, errors.Errorf("type definition: %w", err)
}
return e.extractFirstPathAndPos(ctx, resp)
}
// extractFirstPathAndPos returns the path and the position of the first location.
// It opens the file if needed.
func (e *Editor) extractFirstPathAndPos(ctx context.Context, locs []protocol.Location) (string, Pos, error) {
if len(locs) == 0 {
return "", Pos{}, nil
}
newPath := e.sandbox.Workdir.URIToPath(locs[0].URI)
newPos := fromProtocolPosition(locs[0].Range.Start)
if !e.HasBuffer(newPath) {
if err := e.OpenFile(ctx, newPath); err != nil {
return "", Pos{}, errors.Errorf("OpenFile: %w", err)
}
}
return newPath, newPos, nil
}
// Symbol performs a workspace symbol search using query
func (e *Editor) Symbol(ctx context.Context, query string) ([]SymbolInformation, error) {
params := &protocol.WorkspaceSymbolParams{}
params.Query = query
resp, err := e.Server.Symbol(ctx, params)
if err != nil {
return nil, errors.Errorf("symbol: %w", err)
}
var res []SymbolInformation
for _, si := range resp {
ploc := si.Location
path := e.sandbox.Workdir.URIToPath(ploc.URI)
start := fromProtocolPosition(ploc.Range.Start)
end := fromProtocolPosition(ploc.Range.End)
rnge := Range{
Start: start,
End: end,
}
loc := Location{
Path: path,
Range: rnge,
}
res = append(res, SymbolInformation{
Name: si.Name,
Kind: si.Kind,
Location: loc,
})
}
return res, nil
}
// OrganizeImports requests and performs the source.organizeImports codeAction.
func (e *Editor) OrganizeImports(ctx context.Context, path string) error {
_, err := e.applyCodeActions(ctx, path, nil, nil, protocol.SourceOrganizeImports)
return err
}
// RefactorRewrite requests and performs the source.refactorRewrite codeAction.
func (e *Editor) RefactorRewrite(ctx context.Context, path string, rng *protocol.Range) error {
applied, err := e.applyCodeActions(ctx, path, rng, nil, protocol.RefactorRewrite)
if applied == 0 {
return errors.Errorf("no refactorings were applied")
}
return err
}
// ApplyQuickFixes requests and performs the quickfix codeAction.
func (e *Editor) ApplyQuickFixes(ctx context.Context, path string, rng *protocol.Range, diagnostics []protocol.Diagnostic) error {
applied, err := e.applyCodeActions(ctx, path, rng, diagnostics, protocol.SourceFixAll, protocol.QuickFix)
if applied == 0 {
return errors.Errorf("no quick fixes were applied")
}
return err
}
// ApplyCodeAction applies the given code action.
func (e *Editor) ApplyCodeAction(ctx context.Context, action protocol.CodeAction) error {
for _, change := range action.Edit.DocumentChanges {
path := e.sandbox.Workdir.URIToPath(change.TextDocument.URI)
if int32(e.buffers[path].version) != change.TextDocument.Version {
// Skip edits for old versions.
continue
}
edits := convertEdits(change.Edits)
if err := e.EditBuffer(ctx, path, edits); err != nil {
return errors.Errorf("editing buffer %q: %w", path, err)
}
}
// Execute any commands. The specification says that commands are
// executed after edits are applied.
if action.Command != nil {
if _, err := e.ExecuteCommand(ctx, &protocol.ExecuteCommandParams{
Command: action.Command.Command,
Arguments: action.Command.Arguments,
}); err != nil {
return err
}
}
// Some commands may edit files on disk.
return e.sandbox.Workdir.CheckForFileChanges(ctx)
}
// GetQuickFixes returns the available quick fix code actions.
func (e *Editor) GetQuickFixes(ctx context.Context, path string, rng *protocol.Range, diagnostics []protocol.Diagnostic) ([]protocol.CodeAction, error) {
return e.getCodeActions(ctx, path, rng, diagnostics, protocol.QuickFix, protocol.SourceFixAll)
}
func (e *Editor) applyCodeActions(ctx context.Context, path string, rng *protocol.Range, diagnostics []protocol.Diagnostic, only ...protocol.CodeActionKind) (int, error) {
actions, err := e.getCodeActions(ctx, path, rng, diagnostics, only...)
if err != nil {
return 0, err
}
applied := 0
for _, action := range actions {
if action.Title == "" {
return 0, errors.Errorf("empty title for code action")
}
var match bool
for _, o := range only {
if action.Kind == o {
match = true
break
}
}
if !match {
continue
}
applied++
if err := e.ApplyCodeAction(ctx, action); err != nil {
return 0, err
}
}
return applied, nil
}
func (e *Editor) getCodeActions(ctx context.Context, path string, rng *protocol.Range, diagnostics []protocol.Diagnostic, only ...protocol.CodeActionKind) ([]protocol.CodeAction, error) {
if e.Server == nil {
return nil, nil
}
params := &protocol.CodeActionParams{}
params.TextDocument.URI = e.sandbox.Workdir.URI(path)
params.Context.Only = only
if diagnostics != nil {
params.Context.Diagnostics = diagnostics
}
if rng != nil {
params.Range = *rng
}
return e.Server.CodeAction(ctx, params)
}
func (e *Editor) ExecuteCommand(ctx context.Context, params *protocol.ExecuteCommandParams) (interface{}, error) {
if e.Server == nil {
return nil, nil
}
var match bool
// Ensure that this command was actually listed as a supported command.
for _, command := range e.serverCapabilities.ExecuteCommandProvider.Commands {
if command == params.Command {
match = true
break
}
}
if !match {
return nil, fmt.Errorf("unsupported command %q", params.Command)
}
result, err := e.Server.ExecuteCommand(ctx, params)
if err != nil {
return nil, err
}
// Some commands use the go command, which writes directly to disk.
// For convenience, check for those changes.
if err := e.sandbox.Workdir.CheckForFileChanges(ctx); err != nil {
return nil, err
}
return result, nil
}
func convertEdits(protocolEdits []protocol.TextEdit) []Edit {
var edits []Edit
for _, lspEdit := range protocolEdits {
edits = append(edits, fromProtocolTextEdit(lspEdit))
}
return edits
}
// FormatBuffer gofmts a Go file.
func (e *Editor) FormatBuffer(ctx context.Context, path string) error {
if e.Server == nil {
return nil
}
e.mu.Lock()
version := e.buffers[path].version
e.mu.Unlock()
params := &protocol.DocumentFormattingParams{}
params.TextDocument.URI = e.sandbox.Workdir.URI(path)
resp, err := e.Server.Formatting(ctx, params)
if err != nil {
return errors.Errorf("textDocument/formatting: %w", err)
}
e.mu.Lock()
defer e.mu.Unlock()
if versionAfter := e.buffers[path].version; versionAfter != version {
return fmt.Errorf("before receipt of formatting edits, buffer version changed from %d to %d", version, versionAfter)
}
edits := convertEdits(resp)
if len(edits) == 0 {
return nil
}
return e.editBufferLocked(ctx, path, edits)
}
func (e *Editor) checkBufferPosition(path string, pos Pos) error {
e.mu.Lock()
defer e.mu.Unlock()
buf, ok := e.buffers[path]
if !ok {
return fmt.Errorf("buffer %q is not open", path)
}
if !inText(pos, buf.lines) {
return fmt.Errorf("position %v is invalid in buffer %q", pos, path)
}
return nil
}
// RunGenerate runs `go generate` non-recursively in the workdir-relative dir
// path. It does not report any resulting file changes as a watched file
// change, so must be followed by a call to Workdir.CheckForFileChanges once
// the generate command has completed.
// TODO(rFindley): this shouldn't be necessary anymore. Delete it.
func (e *Editor) RunGenerate(ctx context.Context, dir string) error {
if e.Server == nil {
return nil
}
absDir := e.sandbox.Workdir.AbsPath(dir)
cmd, err := command.NewGenerateCommand("", command.GenerateArgs{
Dir: protocol.URIFromSpanURI(span.URIFromPath(absDir)),
Recursive: false,
})
if err != nil {
return err
}
params := &protocol.ExecuteCommandParams{
Command: cmd.Command,
Arguments: cmd.Arguments,
}
if _, err := e.ExecuteCommand(ctx, params); err != nil {
return fmt.Errorf("running generate: %v", err)