mirror of
https://github.com/golang/go
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4457e4cfd4
This uses the new opencensus compatability layer to add telementry to some of the functions in the lsp, in order to allow us to understand their costs and call patterns. Change-Id: I7df820cd4eace7a4840ac6397d5df402369bf0a7 Reviewed-on: https://go-review.googlesource.com/c/tools/+/183419 Run-TryBot: Ian Cottrell <iancottrell@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Rebecca Stambler <rstambler@golang.org>
48 lines
1.2 KiB
Go
48 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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"fmt"
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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/lsp/telemetry/trace"
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"golang.org/x/tools/internal/span"
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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, ts := trace.StartSpan(ctx, "source.Highlight")
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defer ts.End()
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file := f.GetAST(ctx)
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if file == nil {
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return nil, fmt.Errorf("no AST for %s", f.URI())
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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, fmt.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, fmt.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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