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go/format: document use of Source better

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For #22695.

Change-Id: Idcda3294070aeaeaf940aaf2014b573732fd60a4
Reviewed-on: https://go-review.googlesource.com/80696
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Dmitri Shuralyov <shurcool@gmail.com>
This commit is contained in:
Robert Griesemer 2017-11-29 10:48:12 -08:00
parent f09a3d8223
commit ba1943cd23
1 changed files with 6 additions and 2 deletions
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8
src/go/format/format.go
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@ -24,8 +24,8 @@ const parserMode = parser.ParseComments
// The node type must be *ast.File, *printer.CommentedNode, []ast.Decl,
// []ast.Stmt, or assignment-compatible to ast.Expr, ast.Decl, ast.Spec,
// or ast.Stmt. Node does not modify node. Imports are not sorted for
// nodes representing partial source files (i.e., if the node is not an
// *ast.File or a *printer.CommentedNode not wrapping an *ast.File).
// nodes representing partial source files (for instance, if the node is
// not an *ast.File or a *printer.CommentedNode not wrapping an *ast.File).
//
// The function may return early (before the entire result is written)
// and return a formatting error, for instance due to an incorrect AST.
@ -79,6 +79,10 @@ func Node(dst io.Writer, fset *token.FileSet, node interface{}) error {
// space as src), and the result is indented by the same amount as the first
// line of src containing code. Imports are not sorted for partial source files.
//
// Caution: Tools relying on consistent formatting based on the installed
// version of gofmt (for instance, such as for presubmit checks) should
// execute that gofmt binary instead of calling Source.
//
func Source(src []byte) ([]byte, error) {
fset := token.NewFileSet()
file, sourceAdj, indentAdj, err := parse(fset, "", src, true)