func parseExprListClosed(p *parser, closeWith string) *ast.ExprList {
ret := new(ast.ExprList)
for {
expr := parseExpr(p)
if p.InError() {
return nil
}
ret.Exprs = append(ret.Exprs, expr)
if p.SeeOp(closeWith) {
return ret
}
comma := p.ExpectOp(",")
if comma == nil {
return nil
}
ret.Commas = append(ret.Commas, comma)
// could be a trailing comma
if p.SeeOp(closeWith) {
return ret
}
}
return ret
}
func parseExprList(p *parser) *ast.ExprList {
ret := new(ast.ExprList)
for {
expr := parseExpr(p)
if p.InError() {
return nil
}
ret.Exprs = append(ret.Exprs, expr)
if !p.SeeOp(",") {
break
}
ret.Commas = append(ret.Commas, p.Shift())
}
return ret
}