blob: 8bf43f694193fd22f5900d0fe2b3157ee3151a24 [file] [log] [blame]
// Copyright 2018 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 (
"context"
"golang.org/x/tools/internal/lsp/debug/tag"
"golang.org/x/tools/internal/lsp/protocol"
"golang.org/x/tools/internal/lsp/source"
"golang.org/x/tools/internal/telemetry/event"
)
func (s *Server) signatureHelp(ctx context.Context, params *protocol.SignatureHelpParams) (*protocol.SignatureHelp, error) {
snapshot, fh, ok, err := s.beginFileRequest(params.TextDocument.URI, source.Go)
if !ok {
return nil, err
}
info, activeParameter, err := source.SignatureHelp(ctx, snapshot, fh, params.Position)
if err != nil {
event.Print(ctx, "no signature help", tag.Position.Of(params.Position), event.Err.Of(err))
return nil, nil
}
return &protocol.SignatureHelp{
Signatures: []protocol.SignatureInformation{*info},
ActiveParameter: float64(activeParameter),
}, nil
}