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62e1d13d53
This change adds a very simple implementation of hovering. It doesn't show any documentation, just the object string for the given object. Also, this change sets the prefix for composite literals, making sure we don't insert duplicate text. Change-Id: Ib706ec821a9e459a6c61c10f5dd28d1798944fa3 Reviewed-on: https://go-review.googlesource.com/c/152599 Run-TryBot: Rebecca Stambler <rstambler@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Ian Cottrell <iancottrell@google.com>
51 lines
1.2 KiB
Go
51 lines
1.2 KiB
Go
// Copyright 2018 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/token"
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"go/types"
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)
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func Hover(ctx context.Context, f *File, pos token.Pos) (string, Range, error) {
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fAST, err := f.GetAST()
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if err != nil {
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return "", Range{}, err
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}
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pkg, err := f.GetPackage()
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if err != nil {
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return "", Range{}, err
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}
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i, err := findIdentifier(fAST, pos)
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if err != nil {
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return "", Range{}, err
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}
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if i.ident == nil {
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return "", Range{}, fmt.Errorf("not a valid identifier")
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}
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obj := pkg.TypesInfo.ObjectOf(i.ident)
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if obj == nil {
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return "", Range{}, fmt.Errorf("no object")
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}
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if i.wasEmbeddedField {
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// the original position was on the embedded field declaration
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// so we try to dig out the type and jump to that instead
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if v, ok := obj.(*types.Var); ok {
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if n, ok := v.Type().(*types.Named); ok {
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obj = n.Obj()
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}
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}
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}
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// TODO(rstambler): Add documentation and improve quality of object string.
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content := types.ObjectString(obj, qualifier(fAST, pkg.Types, pkg.TypesInfo))
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markdown := "```go\n" + content + "\n```"
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return markdown, Range{
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Start: i.ident.Pos(),
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End: i.ident.End(),
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}, nil
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}
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