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go/internal/lsp/hover.go

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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"
)
func (s *Server) hover(ctx context.Context, params *protocol.TextDocumentPositionParams) (*protocol.Hover, error) {
uri := span.NewURI(params.TextDocument.URI)
view := s.session.ViewOf(uri)
f, m, err := getGoFile(ctx, view, uri)
if err != nil {
return nil, err
}
spn, err := m.PointSpan(params.Position)
if err != nil {
return nil, err
}
identRange, err := spn.Range(m.Converter)
if err != nil {
return nil, err
}
ident, err := source.Identifier(ctx, view, f, identRange.Start)
if err != nil {
return nil, nil
}
hover, err := ident.Hover(ctx, s.preferredContentFormat == protocol.Markdown, s.hoverKind)
if err != nil {
return nil, err
}
identSpan, err := ident.Range.Span()
if err != nil {
return nil, err
}
rng, err := m.Range(identSpan)
if err != nil {
return nil, err
}
return &protocol.Hover{
Contents: protocol.MarkupContent{
Kind: s.preferredContentFormat,
Value: hover,
},
Range: &rng,
}, nil
}