diff --git a/src/Eval.cpp b/src/Eval.cpp
index 8c9fe55f4..113f4da22 100644
--- a/src/Eval.cpp
+++ b/src/Eval.cpp
@@ -196,6 +196,25 @@ void Eval::compileExpression (const std::string& e)
     context.debug ("FILTER Postfix      " + dump (_compiled));
 }
 
+////////////////////////////////////////////////////////////////////////////////
+void Eval::compileExpression (
+  const std::vector <std::pair <std::string, Lexer::Type>>& precompiled)
+{
+  _compiled = precompiled;
+
+  // Parse for syntax checking and operator replacement.
+  if (_debug)
+    context.debug ("FILTER Infix        " + dump (_compiled));
+  infixParse (_compiled);
+  if (_debug)
+    context.debug ("FILTER Infix parsed " + dump (_compiled));
+
+  // Convert infix --> postfix.
+  infixToPostfix (_compiled);
+  if (_debug)
+    context.debug ("FILTER Postfix      " + dump (_compiled));
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 void Eval::evaluateCompiledExpression (Variant& v)
 {
diff --git a/src/Eval.h b/src/Eval.h
index fd44184d1..cb45fab2f 100644
--- a/src/Eval.h
+++ b/src/Eval.h
@@ -45,6 +45,7 @@ public:
   void evaluateInfixExpression (const std::string&, Variant&) const;
   void evaluatePostfixExpression (const std::string&, Variant&) const;
   void compileExpression (const std::string&);
+  void compileExpression (const std::vector <std::pair <std::string, Lexer::Type>>&);
   void evaluateCompiledExpression (Variant&);
   void ambiguity (bool);
   void debug (bool);