From 37e1625f0139da07c2690b6ee6ca7eae5ebb061a Mon Sep 17 00:00:00 2001
From: Aleksey Kladov <aleksey.kladov@gmail.com>
Date: Wed, 1 Aug 2018 11:27:31 +0300
Subject: return expr

---
 src/parser_api.rs | 23 +++++++++++++++++------
 1 file changed, 17 insertions(+), 6 deletions(-)

(limited to 'src/parser_api.rs')

diff --git a/src/parser_api.rs b/src/parser_api.rs
index 5a0da32c9..d12f773b2 100644
--- a/src/parser_api.rs
+++ b/src/parser_api.rs
@@ -3,22 +3,22 @@ use {
     SyntaxKind::{self, ERROR},
 };
 
-pub(crate) struct TokenSet {
-    pub tokens: &'static [SyntaxKind],
+#[derive(Clone, Copy)]
+pub(crate) struct TokenSet(pub(crate) u128);
+fn mask(kind: SyntaxKind) -> u128 {
+    1u128 << (kind as usize)
 }
 
 impl TokenSet {
     pub fn contains(&self, kind: SyntaxKind) -> bool {
-        self.tokens.contains(&kind)
+        self.0 & mask(kind) != 0
     }
 }
 
 #[macro_export]
 macro_rules! token_set {
     ($($t:ident),*) => {
-        TokenSet {
-            tokens: &[$($t),*],
-        }
+        TokenSet($(1u128 << ($t as usize))|*)
     };
 
     ($($t:ident),* ,) => {
@@ -26,6 +26,17 @@ macro_rules! token_set {
     };
 }
 
+#[macro_export]
+macro_rules! token_set_union {
+    ($($ts:expr),*) => {
+        TokenSet($($ts.0)|*)
+    };
+
+    ($($ts:expr),* ,) => {
+        token_set_union!($($ts),*)
+    };
+}
+
 /// `Parser` struct provides the low-level API for
 /// navigating through the stream of tokens and
 /// constructing the parse tree. The actual parsing
-- 
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