mirror of
https://github.com/golang/go
synced 2024-10-01 06:18:31 -06:00
1cc9451822
Parse errors need to be treated separately from actual errors when parsing a file. Parse errors are treated more like values, whereas actual errors should not be propagated to the user. This enables us to delete some of the special handling for context.Canceled errors. Change-Id: I93a02f22b3f54beccbd6bcf26f04bb8da0202c25 Reviewed-on: https://go-review.googlesource.com/c/tools/+/195997 Run-TryBot: Rebecca Stambler <rstambler@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Ian Cottrell <iancottrell@google.com>
61 lines
1.5 KiB
Go
61 lines
1.5 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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ph := view.Session().Cache().ParseGoHandle(f.Handle(ctx), 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 %f:%f", pos.Line, 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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return nil, errors.Errorf("%f:%f is not an identifier", pos.Line, pos.Character)
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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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