blob: 6930a6c17438c3f388ab6a17c40eb4d993db3579 [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 (
"context"
"golang.org/x/tools/internal/lsp/protocol"
"golang.org/x/tools/internal/lsp/source"
"golang.org/x/tools/internal/span"
"golang.org/x/tools/internal/telemetry/log"
"golang.org/x/tools/internal/telemetry/tag"
)
func (s *Server) references(ctx context.Context, params *protocol.ReferenceParams) ([]protocol.Location, error) {
uri := span.NewURI(params.TextDocument.URI)
view := s.session.ViewOf(uri)
f, err := view.GetFile(ctx, uri)
if err != nil {
return nil, err
}
// Find all references to the identifier at the position.
ident, err := source.Identifier(ctx, view, f, params.Position)
if err != nil {
return nil, err
}
references, err := ident.References(ctx)
if err != nil {
log.Error(ctx, "no references", err, tag.Of("Identifier", ident.Name))
}
// Get the location of each reference to return as the result.
locations := make([]protocol.Location, 0, len(references))
seen := make(map[span.Span]bool)
for _, ref := range references {
refSpan, err := ref.Span()
if err != nil {
return nil, err
}
if seen[refSpan] {
continue // already added this location
}
seen[refSpan] = true
refRange, err := ref.Range()
if err != nil {
return nil, err
}
locations = append(locations, protocol.Location{
URI: protocol.NewURI(ref.URI()),
Range: refRange,
})
}
// The declaration of this identifier may not be in the
// scope that we search for references, so make sure
// it is added to the beginning of the list if IncludeDeclaration
// was specified.
if params.Context.IncludeDeclaration {
decSpan, err := ident.Declaration.Span()
if err != nil {
return nil, err
}
if !seen[decSpan] {
rng, err := ident.Declaration.Range()
if err != nil {
return nil, err
}
locations = append([]protocol.Location{
{
URI: protocol.NewURI(ident.Declaration.URI()),
Range: rng,
},
}, locations...)
}
}
return locations, nil
}