mirror of
https://github.com/golang/go
synced 2024-11-18 22:44:48 -07:00
156eb2ae29
This is a straight move of some code with no changes. It splits the part of the telemetry code that will become a standalone library from the bit that belongs in the lsp. Change-Id: Icedb6bf1f3711da9251450531729984df6df7787 Reviewed-on: https://go-review.googlesource.com/c/tools/+/190403 Run-TryBot: Ian Cottrell <iancottrell@google.com> Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com> TryBot-Result: Gobot Gobot <gobot@golang.org>
49 lines
1.2 KiB
Go
49 lines
1.2 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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"go/token"
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"golang.org/x/tools/go/ast/astutil"
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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, f GoFile, pos token.Pos) ([]span.Span, error) {
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ctx, done := trace.StartSpan(ctx, "source.Highlight")
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defer done()
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file, err := f.GetAST(ctx, ParseFull)
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if file == nil {
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return nil, err
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}
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fset := f.FileSet()
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path, _ := astutil.PathEnclosingInterval(file, pos, pos)
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if len(path) == 0 {
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return nil, errors.Errorf("no enclosing position found for %s", fset.Position(pos))
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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("%s is not an identifier", fset.Position(pos))
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}
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var result []span.Span
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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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s, err := nodeSpan(n, fset)
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if err == nil {
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result = append(result, s)
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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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