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// 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, err := s.session.ViewOf(uri)
if err != nil {
return nil, err
}
snapshot := view.Snapshot()
f, err := view.GetFile(ctx, uri)
if err != nil {
return nil, err
}
// Find all references to the identifier at the position.
if f.Kind() != source.Go {
return nil, nil
}
phs, err := snapshot.PackageHandles(ctx, snapshot.Handle(ctx, f))
if err != nil {
return nil, nil
}
// Get the location of each reference to return as the result.
var (
locations []protocol.Location
seen = make(map[span.Span]bool)
lastIdent *source.IdentifierInfo
)
for _, ph := range phs {
ident, err := source.Identifier(ctx, snapshot, f, params.Position, source.SpecificPackageHandle(ph.ID()))
if err != nil {
if err == source.ErrNoIdentFound {
return nil, err
}
log.Error(ctx, "no identifier", err, tag.Of("Identifier", ident.Name))
continue
}
lastIdent = ident
references, err := ident.References(ctx)
if err != nil {
log.Error(ctx, "no references", err, tag.Of("Identifier", ident.Name))
continue
}
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,
})
}
}
// Only add the identifier's declaration if the client requests it.
if params.Context.IncludeDeclaration && lastIdent != nil {
rng, err := lastIdent.Declaration.Range()
if err != nil {
return nil, err
}
locations = append([]protocol.Location{
{
URI: protocol.NewURI(lastIdent.Declaration.URI()),
Range: rng,
},
}, locations...)
}
return locations, nil
}
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