forked from golang/tools
/
text_synchronization.go
171 lines (155 loc) · 5.25 KB
/
text_synchronization.go
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// 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"
"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/lsp/telemetry"
"golang.org/x/tools/internal/lsp/telemetry/log"
"golang.org/x/tools/internal/lsp/telemetry/trace"
"golang.org/x/tools/internal/span"
)
func (s *Server) didOpen(ctx context.Context, params *protocol.DidOpenTextDocumentParams) error {
uri := span.NewURI(params.TextDocument.URI)
text := []byte(params.TextDocument.Text)
// Confirm that the file's language ID is related to Go.
fileKind := source.DetectLanguage(params.TextDocument.LanguageID, uri.Filename())
// Open the file.
s.session.DidOpen(ctx, uri, fileKind, text)
// Run diagnostics on the newly-changed file.
view := s.session.ViewOf(uri)
go func() {
ctx := view.BackgroundContext()
ctx, done := trace.StartSpan(ctx, "lsp:background-worker")
defer done()
s.Diagnostics(ctx, view, uri)
}()
return nil
}
func (s *Server) didChange(ctx context.Context, params *protocol.DidChangeTextDocumentParams) error {
if len(params.ContentChanges) < 1 {
return jsonrpc2.NewErrorf(jsonrpc2.CodeInternalError, "no content changes provided")
}
uri := span.NewURI(params.TextDocument.URI)
// Check if the client sent the full content of the file.
// We accept a full content change even if the server expected incremental changes.
text, isFullChange := fullChange(params.ContentChanges)
// We only accept an incremental change if the server expected it.
if !isFullChange {
switch s.textDocumentSyncKind {
case protocol.Full:
return fmt.Errorf("expected a full content change, received incremental changes for %s", uri)
case protocol.Incremental:
// Determine the new file content.
var err error
text, err = s.applyChanges(ctx, uri, params.ContentChanges)
if err != nil {
return err
}
}
}
// Cache the new file content and send fresh diagnostics.
view := s.session.ViewOf(uri)
if err := view.SetContent(ctx, uri, []byte(text)); err != nil {
return err
}
// Run diagnostics on the newly-changed file.
go func() {
ctx := view.BackgroundContext()
ctx, done := trace.StartSpan(ctx, "lsp:background-worker")
defer done()
s.Diagnostics(ctx, view, uri)
}()
return nil
}
func fullChange(changes []protocol.TextDocumentContentChangeEvent) (string, bool) {
if len(changes) > 1 {
return "", false
}
// The length of the changes must be 1 at this point.
if changes[0].Range == nil && changes[0].RangeLength == 0 {
return changes[0].Text, true
}
return "", false
}
func (s *Server) applyChanges(ctx context.Context, uri span.URI, changes []protocol.TextDocumentContentChangeEvent) (string, error) {
content, _, err := s.session.GetFile(uri).Read(ctx)
if err != nil {
return "", jsonrpc2.NewErrorf(jsonrpc2.CodeInternalError, "file not found")
}
fset := s.session.Cache().FileSet()
for _, change := range changes {
// Update column mapper along with the content.
m := protocol.NewColumnMapper(uri, uri.Filename(), fset, nil, content)
spn, err := m.RangeSpan(*change.Range)
if err != nil {
return "", err
}
if !spn.HasOffset() {
return "", jsonrpc2.NewErrorf(jsonrpc2.CodeInternalError, "invalid range for content change")
}
start, end := spn.Start().Offset(), spn.End().Offset()
if end < start {
return "", jsonrpc2.NewErrorf(jsonrpc2.CodeInternalError, "invalid range for content change")
}
var buf bytes.Buffer
buf.Write(content[:start])
buf.WriteString(change.Text)
buf.Write(content[end:])
content = buf.Bytes()
}
return string(content), nil
}
func (s *Server) didSave(ctx context.Context, params *protocol.DidSaveTextDocumentParams) error {
s.session.DidSave(span.NewURI(params.TextDocument.URI))
return nil
}
func (s *Server) didClose(ctx context.Context, params *protocol.DidCloseTextDocumentParams) error {
uri := span.NewURI(params.TextDocument.URI)
ctx = telemetry.File.With(ctx, uri)
s.session.DidClose(uri)
view := s.session.ViewOf(uri)
if err := view.SetContent(ctx, uri, nil); err != nil {
return err
}
clear := []span.URI{uri} // by default, clear the closed URI
defer func() {
for _, uri := range clear {
if err := s.publishDiagnostics(ctx, view, uri, []source.Diagnostic{}); err != nil {
log.Error(ctx, "failed to clear diagnostics", err, telemetry.File)
}
}
}()
// If the current file was the only open file for its package,
// clear out all diagnostics for the package.
f, err := view.GetFile(ctx, uri)
if err != nil {
log.Error(ctx, "no file for %s: %v", err, telemetry.File)
return nil
}
// For non-Go files, don't return any diagnostics.
gof, ok := f.(source.GoFile)
if !ok {
log.Error(ctx, "closing a non-Go file, no diagnostics to clear", nil, telemetry.File)
return nil
}
pkg := gof.GetPackage(ctx)
if pkg == nil {
log.Error(ctx, "no package available", nil, telemetry.File)
return nil
}
for _, filename := range pkg.GetFilenames() {
// If other files from this package are open, don't clear.
if s.session.IsOpen(span.NewURI(filename)) {
clear = nil
return nil
}
clear = append(clear, span.FileURI(filename))
}
return nil
}