blob: 28c636deed09da2200910e0fd607bc4c9ee9bdbc [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"
"golang.org/x/tools/internal/jsonrpc2"
"golang.org/x/tools/internal/lsp/protocol"
"golang.org/x/tools/internal/span"
)
func (s *Server) didOpen(ctx context.Context, params *protocol.DidOpenTextDocumentParams) error {
uri := span.NewURI(params.TextDocument.URI)
s.session.DidOpen(uri)
return s.cacheAndDiagnose(ctx, uri, []byte(params.TextDocument.Text))
}
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")
}
var text string
switch s.textDocumentSyncKind {
case protocol.Incremental:
var err error
text, err = s.applyChanges(ctx, params)
if err != nil {
return err
}
case protocol.Full:
// We expect the full content of file, i.e. a single change with no range.
change := params.ContentChanges[0]
if change.RangeLength != 0 {
return jsonrpc2.NewErrorf(jsonrpc2.CodeInternalError, "unexpected change range provided")
}
text = change.Text
}
return s.cacheAndDiagnose(ctx, span.NewURI(params.TextDocument.URI), []byte(text))
}
func (s *Server) cacheAndDiagnose(ctx context.Context, uri span.URI, content []byte) error {
view := s.session.ViewOf(uri)
if err := view.SetContent(ctx, uri, content); err != nil {
return err
}
go func() {
ctx := view.BackgroundContext()
s.Diagnostics(ctx, view, uri)
}()
return nil
}
func (s *Server) applyChanges(ctx context.Context, params *protocol.DidChangeTextDocumentParams) (string, error) {
if len(params.ContentChanges) == 1 && params.ContentChanges[0].Range == nil {
// If range is empty, we expect the full content of file, i.e. a single change with no range.
change := params.ContentChanges[0]
if change.RangeLength != 0 {
return "", jsonrpc2.NewErrorf(jsonrpc2.CodeInternalError, "unexpected change range provided")
}
return change.Text, nil
}
uri := span.NewURI(params.TextDocument.URI)
fc := s.session.ReadFile(uri)
if fc.Error != nil {
return "", jsonrpc2.NewErrorf(jsonrpc2.CodeInternalError, "file not found")
}
content := fc.Data
fset := s.session.Cache().FileSet()
filename, err := uri.Filename()
if err != nil {
return "", jsonrpc2.NewErrorf(jsonrpc2.CodeInternalError, "no filename for %s", uri)
}
for _, change := range params.ContentChanges {
// Update column mapper along with the content.
m := protocol.NewColumnMapper(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 {
uri := span.NewURI(params.TextDocument.URI)
s.session.DidSave(uri)
return nil // ignore
}
func (s *Server) didClose(ctx context.Context, params *protocol.DidCloseTextDocumentParams) error {
uri := span.NewURI(params.TextDocument.URI)
s.session.DidClose(uri)
view := s.session.ViewOf(uri)
return view.SetContent(ctx, uri, nil)
}