github.com/v2fly/tools@v0.100.0/internal/lsp/signature_help.go (about)

     1  // Copyright 2018 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package lsp
     6  
     7  import (
     8  	"context"
     9  
    10  	"github.com/v2fly/tools/internal/event"
    11  	"github.com/v2fly/tools/internal/lsp/debug/tag"
    12  	"github.com/v2fly/tools/internal/lsp/protocol"
    13  	"github.com/v2fly/tools/internal/lsp/source"
    14  )
    15  
    16  func (s *Server) signatureHelp(ctx context.Context, params *protocol.SignatureHelpParams) (*protocol.SignatureHelp, error) {
    17  	snapshot, fh, ok, release, err := s.beginFileRequest(ctx, params.TextDocument.URI, source.Go)
    18  	defer release()
    19  	if !ok {
    20  		return nil, err
    21  	}
    22  	info, activeParameter, err := source.SignatureHelp(ctx, snapshot, fh, params.Position)
    23  	if err != nil {
    24  		event.Error(ctx, "no signature help", err, tag.Position.Of(params.Position))
    25  		return nil, nil
    26  	}
    27  	return &protocol.SignatureHelp{
    28  		Signatures:      []protocol.SignatureInformation{*info},
    29  		ActiveParameter: uint32(activeParameter),
    30  	}, nil
    31  }