From 679f094f16c3584253aa4ac9b3394a03ccd96d2a Mon Sep 17 00:00:00 2001
From: Paul Beckingham <paul@beckingham.net>
Date: Sat, 2 Jan 2016 14:16:11 -0500
Subject: [PATCH] LR0: Added ::getExpectations

---
 src/LR0.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/LR0.cpp b/src/LR0.cpp
index 59c35017..7a8e7252 100644
--- a/src/LR0.cpp
+++ b/src/LR0.cpp
@@ -105,9 +105,14 @@ LR0::Closure LR0::getClosure (const Closure& items)
 }
 
 ////////////////////////////////////////////////////////////////////////////////
+// Collect a unique set of expected symbols from the closure.
 std::vector <std::string> LR0::getExpectations (const Closure& closure)
 {
   std::vector <std::string> expected;
+  for (auto& item : closure)
+    if (! item.done () &&
+        std::find (expected.begin (), expected.end (), item.next ()) == expected.end ())
+      expected.push_back (item.next ());
 
   return expected;
 }