blob: 64cfb5700f55f98dc3fbb94edc8c7866dde8c814 [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"
"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/span"
errors "golang.org/x/xerrors"
)
func (s *Server) didOpen(ctx context.Context, params *protocol.DidOpenTextDocumentParams) error {
uri := span.NewURI(params.TextDocument.URI)
text := []byte(params.TextDocument.Text)
version := params.TextDocument.Version
// 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, version, text)
view, err := s.session.ViewOf(uri)
if err != nil {
return err
}
// Run diagnostics on the newly-changed file.
go s.diagnostics(view.BackgroundContext(), view.Snapshot(), uri)
return nil
}
func (s *Server) didChange(ctx context.Context, params *protocol.DidChangeTextDocumentParams) error {
options := s.session.Options()
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 options.TextDocumentSyncKind {
case protocol.Full:
return errors.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, err := s.session.ViewOf(uri)
if err != nil {
return err
}
view.SetContent(ctx, uri, params.TextDocument.Version, []byte(text))
// 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(uri) && source.IsGenerated(ctx, view, uri) {
s.client.ShowMessage(ctx, &protocol.ShowMessageParams{
Message: fmt.Sprintf("Do not edit this file! %s is a generated file.", uri.Filename()),
Type: protocol.Warning,
})
}
// Run diagnostics on the newly-changed file.
go s.diagnostics(view.BackgroundContext(), view.Snapshot(), uri)
return nil
}
func (s *Server) wasFirstChange(uri span.URI) bool {
if s.changedFiles == nil {
s.changedFiles = make(map[span.URI]struct{})
}
_, ok := s.changedFiles[uri]
return ok
}
func fullChange(changes []protocol.TextDocumentContentChangeEvent) (string, bool) {
if len(changes) > 1 {
return "", false
}
// The length of the changes must be 1 at this point.
// TODO: This breaks if you insert a character at the beginning of the file.
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, source.UnknownKind).Read(ctx)
if err != nil {
return "", jsonrpc2.NewErrorf(jsonrpc2.CodeInternalError, "file not found (%v)", err)
}
for _, change := range changes {
// Update column mapper along with the content.
converter := span.NewContentConverter(uri.Filename(), content)
m := &protocol.ColumnMapper{
URI: uri,
Converter: converter,
Content: content,
}
spn, err := m.RangeSpan(*change.Range) // Could Range be nil here?
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), params.TextDocument.Version)
return nil
}
func (s *Server) didClose(ctx context.Context, params *protocol.DidCloseTextDocumentParams) error {
uri := span.NewURI(params.TextDocument.URI)
ctx = telemetry.URI.With(ctx, uri)
s.session.DidClose(uri)
view, err := s.session.ViewOf(uri)
if err != nil {
return err
}
view.SetContent(ctx, uri, -1, nil)
return nil
}