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https://github.com/golang/go
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944452d4f0
We used to return an error from textDocument/highlight if the cursor wasn't over an identifier. Logging these errors is not useful, as the cursor is often not on an identifier. Change-Id: Ibb43908149315c72923a22bdca567aa2b3ee68d8 Reviewed-on: https://go-review.googlesource.com/c/tools/+/199640 Run-TryBot: Rebecca Stambler <rstambler@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Ian Cottrell <iancottrell@google.com>
63 lines
1.6 KiB
Go
63 lines
1.6 KiB
Go
// Copyright 2019 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package source
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import (
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"context"
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"go/ast"
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"golang.org/x/tools/go/ast/astutil"
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"golang.org/x/tools/internal/lsp/protocol"
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"golang.org/x/tools/internal/span"
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"golang.org/x/tools/internal/telemetry/trace"
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errors "golang.org/x/xerrors"
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)
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func Highlight(ctx context.Context, view View, uri span.URI, pos protocol.Position) ([]protocol.Range, error) {
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ctx, done := trace.StartSpan(ctx, "source.Highlight")
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defer done()
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f, err := view.GetFile(ctx, uri)
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if err != nil {
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return nil, err
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}
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fh := view.Snapshot().Handle(ctx, f)
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ph := view.Session().Cache().ParseGoHandle(fh, ParseFull)
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file, m, _, err := ph.Parse(ctx)
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if err != nil {
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return nil, err
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}
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spn, err := m.PointSpan(pos)
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if err != nil {
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return nil, err
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}
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rng, err := spn.Range(m.Converter)
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if err != nil {
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return nil, err
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}
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path, _ := astutil.PathEnclosingInterval(file, rng.Start, rng.Start)
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if len(path) == 0 {
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return nil, errors.Errorf("no enclosing position found for %v:%v", int(pos.Line), int(pos.Character))
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}
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id, ok := path[0].(*ast.Ident)
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if !ok {
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// If the cursor is not within an identifier, return empty results.
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return []protocol.Range{}, nil
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}
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var result []protocol.Range
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if id.Obj != nil {
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ast.Inspect(path[len(path)-1], func(n ast.Node) bool {
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if n, ok := n.(*ast.Ident); ok && n.Obj == id.Obj {
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rng, err := nodeToProtocolRange(ctx, view, m, n)
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if err == nil {
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result = append(result, rng)
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}
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}
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return true
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})
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}
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return result, nil
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}
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