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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 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) FoldingRange(ctx context.Context, params *protocol.FoldingRangeParams) ([]protocol.FoldingRange, error) {
ctx, done := event.Start(ctx, "lsp.Server.foldingRange", 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
}
ranges, err := golang.FoldingRange(ctx, snapshot, fh, snapshot.Options().LineFoldingOnly)
if err != nil {
return nil, err
}
return toProtocolFoldingRanges(ranges)
}
func toProtocolFoldingRanges(ranges []*golang.FoldingRangeInfo) ([]protocol.FoldingRange, error) {
result := make([]protocol.FoldingRange, 0, len(ranges))
for _, info := range ranges {
rng := info.MappedRange.Range()
result = append(result, protocol.FoldingRange{
StartLine: rng.Start.Line,
StartCharacter: rng.Start.Character,
EndLine: rng.End.Line,
EndCharacter: rng.End.Character,
Kind: string(info.Kind),
})
}
return result, nil
}
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