From 9d239f7a801e76828e8dba893552e603e5692bf4 Mon Sep 17 00:00:00 2001
From: Paul Beckingham <paul@beckingham.net>
Date: Tue, 5 Jan 2016 12:00:40 -0500
Subject: [PATCH] LR0: Added ::Item::setReductionRule

---
 src/LR0.cpp | 11 +++++++++++
 src/LR0.h   |  2 ++
 2 files changed, 13 insertions(+)

diff --git a/src/LR0.cpp b/src/LR0.cpp
index bc8db326..5ab10439 100644
--- a/src/LR0.cpp
+++ b/src/LR0.cpp
@@ -216,6 +216,7 @@ LR0::Item::Item (const std::vector <std::string>& rule)
 : _rule (rule)
 , _cursor (2)
 , _grammarRule (-1)
+, _reducesTo (-1)
 {
   if (_rule.size () == 3 && _rule[2] == "є")
     _rule.pop_back ();
@@ -226,6 +227,7 @@ bool LR0::Item::operator== (const Item& other)
 {
   if (_cursor       != other._cursor      ||
       _grammarRule  != other._grammarRule ||
+      _reducesTo    != other._reducesTo   ||
       _rule.size () != other._rule.size ())
     return false;
 
@@ -242,6 +244,12 @@ void LR0::Item::setGrammarRuleIndex (const int rule)
   _grammarRule = rule;
 }
 
+////////////////////////////////////////////////////////////////////////////////
+void LR0::Item::setReductionRule (const int rule)
+{
+  _reducesTo = rule;
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 bool LR0::Item::advance ()
 {
@@ -286,6 +294,9 @@ std::string LR0::Item::dump () const
   if (_grammarRule != -1)
     out << " [g" << _grammarRule << "]";
 
+  if (_reducesTo != -1)
+    out << " [r" << _reducesTo << "]";
+
   return out.str ();
 }
 
diff --git a/src/LR0.h b/src/LR0.h
index 74523637..e362c683 100644
--- a/src/LR0.h
+++ b/src/LR0.h
@@ -47,6 +47,7 @@ public:
     Item (const std::vector <std::string>&);
     bool operator== (const LR0::Item&);
     void setGrammarRuleIndex (const int);
+    void setReductionRule (const int);
     bool advance ();
     bool done () const;
     std::string next () const;
@@ -56,6 +57,7 @@ public:
     std::vector <std::string> _rule;
     unsigned int _cursor;
     int _grammarRule;
+    int _reducesTo;
   };
 
   class Closure : public std::vector <Item>