added compiler extensions class

components/compiler/extensions.cpp

@@ -0,0 +1,18 @@
+
+#include "extensions.hpp"
+
+namespace Compiler
+{
+
+    Extensions::Extensions() : mNextKeywordIndex (-1) {}
+
+    int Extensions::searchKeyword (const std::string& keyword) const
+    {
+        std::map<std::string, int>::const_iterator iter = mKeywords.find (keyword);
+        
+        if (iter==mKeywords.end())
+            return 0;
+            
+        return iter->second;
+    }
+}