blob: 3f84f2f0d05afd28b9d10b8b146e09deee2ef505 [file] [log] [blame]
// Copyright 2021 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 typeparams
import (
func PackIndexExpr(x ast.Expr, lbrack token.Pos, exprs []ast.Expr, rbrack token.Pos) ast.Expr {
switch len(exprs) {
case 0:
panic("internal error: PackIndexExpr with empty expr slice")
case 1:
return &ast.IndexExpr{
X: x,
Lbrack: lbrack,
Index: exprs[0],
Rbrack: rbrack,
return &ast.IndexListExpr{
X: x,
Lbrack: lbrack,
Indices: exprs,
Rbrack: rbrack,
// IndexExpr wraps an ast.IndexExpr or ast.IndexListExpr.
// Orig holds the original ast.Expr from which this IndexExpr was derived.
type IndexExpr struct {
Orig ast.Expr // the wrapped expr, which may be distinct from the IndexListExpr below.
func UnpackIndexExpr(n ast.Node) *IndexExpr {
switch e := n.(type) {
case *ast.IndexExpr:
return &IndexExpr{e, &ast.IndexListExpr{
X: e.X,
Lbrack: e.Lbrack,
Indices: []ast.Expr{e.Index},
Rbrack: e.Rbrack,
case *ast.IndexListExpr:
return &IndexExpr{e, e}
return nil