Compute transitions for regex pattern rules

src/rules/rule.cpp

@@ -2,10 +2,23 @@
 
 namespace tree_sitter {
     namespace rules {
+        bool Rule::operator==(const rule_ptr other) const {
+            return true;
+        }
+
         std::ostream& operator<<(std::ostream& stream, const Rule &rule)
         {
             stream << rule.to_string();
             return stream;
         }
+
+        std::ostream& operator<<(std::ostream& stream, const rule_ptr &rule)
+        {
+            if (rule.get() == nullptr)
+                stream << std::string("<NULL rule>");
+            else
+                stream << rule->to_string();
+            return stream;
+        }
     }
 }