mirror of
https://github.com/golang/go
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1b7e409d2c
Change-Id: I20e3acee4272f05a9f31a7bb4219fc2fe751e6b3 Reviewed-on: https://go-review.googlesource.com/c/tools/+/185988 Run-TryBot: Ian Cottrell <iancottrell@google.com> Reviewed-by: Rebecca Stambler <rstambler@golang.org>
62 lines
1.7 KiB
Go
62 lines
1.7 KiB
Go
// Copyright 2018 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package lsp
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import (
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"context"
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"golang.org/x/tools/internal/lsp/protocol"
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"golang.org/x/tools/internal/lsp/source"
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"golang.org/x/tools/internal/lsp/xlog"
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"golang.org/x/tools/internal/span"
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)
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func (s *Server) signatureHelp(ctx context.Context, params *protocol.TextDocumentPositionParams) (*protocol.SignatureHelp, error) {
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uri := span.NewURI(params.TextDocument.URI)
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view := s.session.ViewOf(uri)
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f, m, err := getGoFile(ctx, view, uri)
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if err != nil {
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return nil, err
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}
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spn, err := m.PointSpan(params.Position)
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if err != nil {
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return nil, err
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}
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rng, err := spn.Range(m.Converter)
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if err != nil {
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return nil, err
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}
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info, err := source.SignatureHelp(ctx, f, rng.Start)
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if err != nil {
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xlog.Infof(ctx, "no signature help for %s:%v:%v : %s", uri, int(params.Position.Line), int(params.Position.Character), err)
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return nil, nil
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}
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return toProtocolSignatureHelp(info), nil
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}
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func toProtocolSignatureHelp(info *source.SignatureInformation) *protocol.SignatureHelp {
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return &protocol.SignatureHelp{
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ActiveParameter: float64(info.ActiveParameter),
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ActiveSignature: 0, // there is only ever one possible signature
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Signatures: []protocol.SignatureInformation{
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{
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Label: info.Label,
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Documentation: info.Documentation,
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Parameters: toProtocolParameterInformation(info.Parameters),
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},
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},
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}
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}
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func toProtocolParameterInformation(info []source.ParameterInformation) []protocol.ParameterInformation {
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var result []protocol.ParameterInformation
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for _, p := range info {
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result = append(result, protocol.ParameterInformation{
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Label: p.Label,
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})
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}
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return result
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}
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