From e114504ce09a67a4edc58ee0364573baf8a66879 Mon Sep 17 00:00:00 2001
From: Tobias Reiher <reiher@componolit.com>
Date: Fri, 26 Jun 2020 17:15:20 +0200
Subject: [PATCH] Improve performance of expression parsing

Ref. #305
---
 rflx/parser/grammar.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/rflx/parser/grammar.py b/rflx/parser/grammar.py
index c3fafc25d..9df781c06 100644
--- a/rflx/parser/grammar.py
+++ b/rflx/parser/grammar.py
@@ -8,6 +8,7 @@
     Literal,
     Optional,
     ParseFatalException,
+    ParserElement,
     ParseResults,
     QuotedString,
     Regex,
@@ -70,6 +71,8 @@
     Then,
 )
 
+ParserElement.enablePackrat()
+
 
 def comma() -> Token:
     return Suppress(Literal(",")).setName('","')