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// 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 server
import (
"context"
"golang.org/x/tools/gopls/internal/file"
"golang.org/x/tools/gopls/internal/golang"
"golang.org/x/tools/gopls/internal/label"
"golang.org/x/tools/gopls/internal/protocol"
"golang.org/x/tools/internal/event"
)
func (s *server) SignatureHelp(ctx context.Context, params *protocol.SignatureHelpParams) (*protocol.SignatureHelp, error) {
ctx, done := event.Start(ctx, "lsp.Server.signatureHelp", label.URI.Of(params.TextDocument.URI))
defer done()
fh, snapshot, release, err := s.fileOf(ctx, params.TextDocument.URI)
if err != nil {
return nil, err
}
defer release()
if snapshot.FileKind(fh) != file.Go {
return nil, nil // empty result
}
info, activeParameter, err := golang.SignatureHelp(ctx, snapshot, fh, params.Position)
if err != nil {
// TODO(rfindley): is this correct? Apparently, returning an error from
// signatureHelp is distracting in some editors, though I haven't confirmed
// that recently.
//
// It's unclear whether we still need to avoid returning this error result.
event.Error(ctx, "signature help failed", err, label.Position.Of(params.Position))
return nil, nil
}
if info == nil {
return nil, nil
}
return &protocol.SignatureHelp{
Signatures: []protocol.SignatureInformation{*info},
ActiveParameter: uint32(activeParameter),
}, nil
}
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