-
Notifications
You must be signed in to change notification settings - Fork 2.3k
/
text_synchronization.go
318 lines (285 loc) · 9.2 KB
/
text_synchronization.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
// Copyright 2019 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 lsp
import (
"bytes"
"context"
"fmt"
"path/filepath"
"sync"
"golang.org/x/tools/internal/jsonrpc2"
"golang.org/x/tools/internal/lsp/protocol"
"golang.org/x/tools/internal/lsp/source"
"golang.org/x/tools/internal/span"
errors "golang.org/x/xerrors"
)
// ModificationSource identifies the originating cause of a file modification.
type ModificationSource int
const (
// FromDidOpen is a file modification caused by opening a file.
FromDidOpen = ModificationSource(iota)
// FromDidChange is a file modification caused by changing a file.
FromDidChange
// FromDidChangeWatchedFiles is a file modification caused by a change to a
// watched file.
FromDidChangeWatchedFiles
// FromDidSave is a file modification caused by a file save.
FromDidSave
// FromDidClose is a file modification caused by closing a file.
FromDidClose
// FromRegenerateCgo refers to file modifications caused by regenerating
// the cgo sources for the workspace.
FromRegenerateCgo
// FromInitialWorkspaceLoad refers to the loading of all packages in the
// workspace when the view is first created.
FromInitialWorkspaceLoad
)
func (m ModificationSource) String() string {
switch m {
case FromDidOpen:
return "opened files"
case FromDidChange:
return "changed files"
case FromDidChangeWatchedFiles:
return "files changed on disk"
case FromDidSave:
return "saved files"
case FromDidClose:
return "close files"
case FromRegenerateCgo:
return "regenerate cgo"
case FromInitialWorkspaceLoad:
return "initial workspace load"
default:
return "unknown file modification"
}
}
func (s *Server) didOpen(ctx context.Context, params *protocol.DidOpenTextDocumentParams) error {
uri := params.TextDocument.URI.SpanURI()
if !uri.IsFile() {
return nil
}
// There may not be any matching view in the current session. If that's
// the case, try creating a new view based on the opened file path.
//
// TODO(rstambler): This seems like it would continuously add new
// views, but it won't because ViewOf only returns an error when there
// are no views in the session. I don't know if that logic should go
// here, or if we can continue to rely on that implementation detail.
if _, err := s.session.ViewOf(uri); err != nil {
dir := filepath.Dir(uri.Filename())
if err := s.addFolders(ctx, []protocol.WorkspaceFolder{{
URI: string(protocol.URIFromPath(dir)),
Name: filepath.Base(dir),
}}); err != nil {
return err
}
}
return s.didModifyFiles(ctx, []source.FileModification{{
URI: uri,
Action: source.Open,
Version: params.TextDocument.Version,
Text: []byte(params.TextDocument.Text),
LanguageID: params.TextDocument.LanguageID,
}}, FromDidOpen)
}
func (s *Server) didChange(ctx context.Context, params *protocol.DidChangeTextDocumentParams) error {
uri := params.TextDocument.URI.SpanURI()
if !uri.IsFile() {
return nil
}
text, err := s.changedText(ctx, uri, params.ContentChanges)
if err != nil {
return err
}
c := source.FileModification{
URI: uri,
Action: source.Change,
Version: params.TextDocument.Version,
Text: text,
}
if err := s.didModifyFiles(ctx, []source.FileModification{c}, FromDidChange); err != nil {
return err
}
return s.warnAboutModifyingGeneratedFiles(ctx, uri)
}
// warnAboutModifyingGeneratedFiles shows a warning if a user tries to edit a
// generated file for the first time.
func (s *Server) warnAboutModifyingGeneratedFiles(ctx context.Context, uri span.URI) error {
s.changedFilesMu.Lock()
_, ok := s.changedFiles[uri]
if !ok {
s.changedFiles[uri] = struct{}{}
}
s.changedFilesMu.Unlock()
// This file has already been edited before.
if ok {
return nil
}
// Ideally, we should be able to specify that a generated file should
// be opened as read-only. Tell the user that they should not be
// editing a generated file.
view, err := s.session.ViewOf(uri)
if err != nil {
return err
}
snapshot, release := view.Snapshot(ctx)
isGenerated := source.IsGenerated(ctx, snapshot, uri)
release()
if !isGenerated {
return nil
}
return s.client.ShowMessage(ctx, &protocol.ShowMessageParams{
Message: fmt.Sprintf("Do not edit this file! %s is a generated file.", uri.Filename()),
Type: protocol.Warning,
})
}
func (s *Server) didChangeWatchedFiles(ctx context.Context, params *protocol.DidChangeWatchedFilesParams) error {
var modifications []source.FileModification
for _, change := range params.Changes {
uri := change.URI.SpanURI()
if !uri.IsFile() {
continue
}
action := changeTypeToFileAction(change.Type)
modifications = append(modifications, source.FileModification{
URI: uri,
Action: action,
OnDisk: true,
})
}
return s.didModifyFiles(ctx, modifications, FromDidChangeWatchedFiles)
}
func (s *Server) didSave(ctx context.Context, params *protocol.DidSaveTextDocumentParams) error {
uri := params.TextDocument.URI.SpanURI()
if !uri.IsFile() {
return nil
}
c := source.FileModification{
URI: uri,
Action: source.Save,
}
if params.Text != nil {
c.Text = []byte(*params.Text)
}
return s.didModifyFiles(ctx, []source.FileModification{c}, FromDidSave)
}
func (s *Server) didClose(ctx context.Context, params *protocol.DidCloseTextDocumentParams) error {
uri := params.TextDocument.URI.SpanURI()
if !uri.IsFile() {
return nil
}
return s.didModifyFiles(ctx, []source.FileModification{
{
URI: uri,
Action: source.Close,
Version: -1,
Text: nil,
},
}, FromDidClose)
}
func (s *Server) didModifyFiles(ctx context.Context, modifications []source.FileModification, cause ModificationSource) error {
// diagnosticWG tracks outstanding diagnostic work as a result of this file
// modification.
var diagnosticWG sync.WaitGroup
if s.session.Options().VerboseWorkDoneProgress {
work := s.progress.start(ctx, DiagnosticWorkTitle(cause), "Calculating file diagnostics...", nil, nil)
defer func() {
go func() {
diagnosticWG.Wait()
work.end("Done.")
}()
}()
}
// If the set of changes included directories, expand those directories
// to their files.
modifications = s.session.ExpandModificationsToDirectories(ctx, modifications)
snapshots, releases, err := s.session.DidModifyFiles(ctx, modifications)
if err != nil {
return err
}
for snapshot, uris := range snapshots {
diagnosticWG.Add(1)
go func(snapshot source.Snapshot, uris []span.URI) {
defer diagnosticWG.Done()
s.diagnoseSnapshot(snapshot, uris, cause == FromDidChangeWatchedFiles)
}(snapshot, uris)
}
go func() {
diagnosticWG.Wait()
for _, release := range releases {
release()
}
}()
// After any file modifications, we need to update our watched files,
// in case something changed. Compute the new set of directories to watch,
// and if it differs from the current set, send updated registrations.
return s.updateWatchedDirectories(ctx)
}
// DiagnosticWorkTitle returns the title of the diagnostic work resulting from a
// file change originating from the given cause.
func DiagnosticWorkTitle(cause ModificationSource) string {
return fmt.Sprintf("diagnosing %v", cause)
}
func (s *Server) changedText(ctx context.Context, uri span.URI, changes []protocol.TextDocumentContentChangeEvent) ([]byte, error) {
if len(changes) == 0 {
return nil, errors.Errorf("%w: no content changes provided", jsonrpc2.ErrInternal)
}
// Check if the client sent the full content of the file.
// We accept a full content change even if the server expected incremental changes.
if len(changes) == 1 && changes[0].Range == nil && changes[0].RangeLength == 0 {
return []byte(changes[0].Text), nil
}
return s.applyIncrementalChanges(ctx, uri, changes)
}
func (s *Server) applyIncrementalChanges(ctx context.Context, uri span.URI, changes []protocol.TextDocumentContentChangeEvent) ([]byte, error) {
fh, err := s.session.GetFile(ctx, uri)
if err != nil {
return nil, err
}
content, err := fh.Read()
if err != nil {
return nil, errors.Errorf("%w: file not found (%v)", jsonrpc2.ErrInternal, err)
}
for _, change := range changes {
// Make sure to update column mapper along with the content.
converter := span.NewContentConverter(uri.Filename(), content)
m := &protocol.ColumnMapper{
URI: uri,
Converter: converter,
Content: content,
}
if change.Range == nil {
return nil, errors.Errorf("%w: unexpected nil range for change", jsonrpc2.ErrInternal)
}
spn, err := m.RangeSpan(*change.Range)
if err != nil {
return nil, err
}
if !spn.HasOffset() {
return nil, errors.Errorf("%w: invalid range for content change", jsonrpc2.ErrInternal)
}
start, end := spn.Start().Offset(), spn.End().Offset()
if end < start {
return nil, errors.Errorf("%w: invalid range for content change", jsonrpc2.ErrInternal)
}
var buf bytes.Buffer
buf.Write(content[:start])
buf.WriteString(change.Text)
buf.Write(content[end:])
content = buf.Bytes()
}
return content, nil
}
func changeTypeToFileAction(ct protocol.FileChangeType) source.FileAction {
switch ct {
case protocol.Changed:
return source.Change
case protocol.Created:
return source.Create
case protocol.Deleted:
return source.Delete
}
return source.UnknownFileAction
}