| // Copyright 2018 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| package source |
| |
| import ( |
| "bytes" |
| "context" |
| "go/format" |
| ) |
| |
| // Format formats a document with a given range. |
| func Format(ctx context.Context, f *File, rng Range) ([]TextEdit, error) { |
| fAST, err := f.GetAST() |
| if err != nil { |
| return nil, err |
| } |
| |
| // TODO(rstambler): use astutil.PathEnclosingInterval to |
| // find the largest ast.Node n contained within start:end, and format the |
| // region n.Pos-n.End instead. |
| |
| // format.Node changes slightly from one release to another, so the version |
| // of Go used to build the LSP server will determine how it formats code. |
| // This should be acceptable for all users, who likely be prompted to rebuild |
| // the LSP server on each Go release. |
| buf := &bytes.Buffer{} |
| if err := format.Node(buf, f.view.Config.Fset, fAST); err != nil { |
| return nil, err |
| } |
| // TODO(rstambler): Compute text edits instead of replacing whole file. |
| return []TextEdit{ |
| { |
| Range: rng, |
| NewText: buf.String(), |
| }, |
| }, nil |
| } |