Preserve parenthesization in the AST

Maintain explicit "paren" nodes in the AST so we can pretty-print
without having to guess where parens should go. We may revisit this
in the future.

r=graydon

1 files changed, 0 insertions, 36 deletions

diff --git a/src/libsyntax/parse/classify.rs b/src/libsyntax/parse/classify.rs
index ff3abb5379e..2f3e29bd90f 100644
--- a/src/libsyntax/parse/classify.rs
+++ b/src/libsyntax/parse/classify.rs
@@ -36,39 +36,3 @@ fn stmt_ends_with_semi(stmt: ast::stmt) -> bool {
       }
     }
 }
-
-fn need_parens(expr: @ast::expr, outer_prec: uint) -> bool {
-    match expr.node {
-      ast::expr_binary(op, _, _) => operator_prec(op) < outer_prec,
-      ast::expr_cast(_, _) => parse::prec::as_prec < outer_prec,
-      // This may be too conservative in some cases
-      ast::expr_assign(_, _) => true,
-      ast::expr_swap(_, _) => true,
-      ast::expr_assign_op(_, _, _) => true,
-      ast::expr_ret(_) => true,
-      ast::expr_assert(_) => true,
-      ast::expr_log(_, _, _) => true,
-      _ => !parse::classify::expr_requires_semi_to_be_stmt(expr)
-    }
-}
-
-fn ends_in_lit_int(ex: @ast::expr) -> bool {
-    match ex.node {
-      ast::expr_lit(node) => match node {
-        @{node: ast::lit_int(_, ast::ty_i), _}
-        | @{node: ast::lit_int_unsuffixed(_), _} => true,
-        _ => false
-      },
-      ast::expr_binary(_, _, sub) | ast::expr_unary(_, sub) |
-      ast::expr_copy(sub) | ast::expr_assign(_, sub) |
-      ast::expr_assign_op(_, _, sub) | ast::expr_swap(_, sub) |
-      ast::expr_log(_, _, sub) | ast::expr_assert(sub) => {
-        ends_in_lit_int(sub)
-      }
-      ast::expr_fail(osub) | ast::expr_ret(osub) => match osub {
-        Some(ex) => ends_in_lit_int(ex),
-        _ => false
-      },
-      _ => false
-    }
-}