blob: a29edd5bdebb1319896b779e2e01909d03683ca7 [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) 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), text)
}
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)
view := s.findView(ctx, uri)
file, m, err := newColumnMap(ctx, view, uri)
if err != nil {
return "", jsonrpc2.NewErrorf(jsonrpc2.CodeInternalError, "file not found")
}
content := file.GetContent(ctx)
for _, change := range params.ContentChanges {
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 {
return nil // ignore
}
func (s *Server) didClose(ctx context.Context, params *protocol.DidCloseTextDocumentParams) error {
uri := span.NewURI(params.TextDocument.URI)
view := s.findView(ctx, uri)
return view.SetContent(ctx, uri, nil)
}