From fe45ee2dde28c995f1aa16a9cdc3119e00a26a8a Mon Sep 17 00:00:00 2001
From: crupest <crupest@outlook.com>
Date: Sat, 11 Sep 2021 18:23:19 +0800
Subject: ...

---
 include/cru/parse/Grammar.hpp | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'include/cru')

diff --git a/include/cru/parse/Grammar.hpp b/include/cru/parse/Grammar.hpp
index 98bed1b1..5b37ceba 100644
--- a/include/cru/parse/Grammar.hpp
+++ b/include/cru/parse/Grammar.hpp
@@ -42,6 +42,8 @@ class Grammar : public Object {
   std::unordered_map<Nonterminal*, std::vector<Production*>>
   GenerateLeftProductionMap() const;
 
+  // Algorithm 4.19.
+  // Require grammar has no cycles or empty-productions.
   void EliminateLeftRecursions();
 
  private:
-- 
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