blob: c709a3a5e19d2c3292094864ae96f9222e027892 [file] [log] [blame]
// 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
}
s.changedFilesMu.Lock()
defer s.changedFilesMu.Unlock()
s.changedFiles[uri] = struct{}{}
return nil
}
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,
Version: params.TextDocument.Version,
}
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(ctx, "Done.")
}()
}()
}
snapshots, releases, deletions, err := s.session.DidModifyFiles(ctx, modifications)
if err != nil {
return err
}
for _, uri := range deletions {
if err := s.client.PublishDiagnostics(ctx, &protocol.PublishDiagnosticsParams{
URI: protocol.URIFromSpanURI(uri),
Diagnostics: []protocol.Diagnostic{},
Version: 0,
}); err != nil {
return err
}
}
snapshotByURI := make(map[span.URI]source.Snapshot)
for _, c := range modifications {
snapshotByURI[c.URI] = nil
}
// Avoid diagnosing the same snapshot twice.
snapshotSet := make(map[source.Snapshot][]span.URI)
for uri := range snapshotByURI {
view, err := s.session.ViewOf(uri)
if err != nil {
return err
}
var snapshot source.Snapshot
for _, s := range snapshots {
if s.View() == view {
if snapshot != nil {
return errors.Errorf("duplicate snapshots for the same view")
}
snapshot = s
}
}
// If the file isn't in any known views (for example, if it's in a dependency),
// we may not have a snapshot to map it to. As a result, we won't try to
// diagnose it. TODO(rstambler): Figure out how to handle this better.
if snapshot == nil {
continue
}
snapshotSet[snapshot] = append(snapshotSet[snapshot], uri)
snapshotByURI[uri] = snapshot
}
for _, mod := range modifications {
if mod.OnDisk || mod.Action != source.Change {
continue
}
snapshot, ok := snapshotByURI[mod.URI]
if !ok {
continue
}
// 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.
if s.wasFirstChange(mod.URI) && source.IsGenerated(ctx, snapshot, mod.URI) {
if err := s.client.ShowMessage(ctx, &protocol.ShowMessageParams{
Message: fmt.Sprintf("Do not edit this file! %s is a generated file.", mod.URI.Filename()),
Type: protocol.Warning,
}); err != nil {
return err
}
}
}
for snapshot, uris := range snapshotSet {
// If a modification comes in for the view's go.mod file and the view
// was never properly initialized, or the view does not have
// a go.mod file, try to recreate the associated view.
if modfile := snapshot.View().ModFile(); modfile == "" {
for _, uri := range uris {
// Don't rebuild the view until the go.mod is on disk.
if !snapshot.IsSaved(uri) {
continue
}
fh, err := snapshot.GetFile(ctx, uri)
if err != nil {
return err
}
switch fh.Kind() {
case source.Mod:
newSnapshot, release, err := snapshot.View().Rebuild(ctx)
releases = append(releases, release)
if err != nil {
return err
}
// Update the snapshot to the rebuilt one.
snapshot = newSnapshot
}
}
}
diagnosticWG.Add(1)
go func(snapshot source.Snapshot) {
defer diagnosticWG.Done()
s.diagnoseSnapshot(snapshot)
}(snapshot)
}
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.
if err := s.updateWatchedDirectories(ctx, snapshots); err != nil {
return err
}
return nil
}
// 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) wasFirstChange(uri span.URI) bool {
s.changedFilesMu.Lock()
defer s.changedFilesMu.Unlock()
if s.changedFiles == nil {
s.changedFiles = make(map[span.URI]struct{})
}
_, ok := s.changedFiles[uri]
return !ok
}
func (s *Server) changedText(ctx context.Context, uri span.URI, changes []protocol.TextDocumentContentChangeEvent) ([]byte, error) {
if len(changes) == 0 {
return nil, fmt.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, fmt.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, fmt.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, fmt.Errorf("%w: invalid range for content change", jsonrpc2.ErrInternal)
}
start, end := spn.Start().Offset(), spn.End().Offset()
if end < start {
return nil, fmt.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
}