From ae6bd9f6b02cd946f172ba322bf661c197f65370 Mon Sep 17 00:00:00 2001
From: Dylan Thacker-Smith <dylan.smith@shopify.com>
Date: Tue, 20 Oct 2020 14:11:48 -0400
Subject: [PATCH] Allow an empty variable tag during strict parsing for
 liquid-c compat (#1320)

---
 lib/liquid/variable.rb                  | 2 ++
 test/integration/parsing_quirks_test.rb | 4 ++++
 2 files changed, 6 insertions(+)

diff --git a/lib/liquid/variable.rb b/lib/liquid/variable.rb
index addb495..77d6b0c 100644
--- a/lib/liquid/variable.rb
+++ b/lib/liquid/variable.rb
@@ -63,6 +63,8 @@ module Liquid
       @filters = []
       p = Parser.new(markup)
 
+      return if p.look(:end_of_string)
+
       @name = Expression.parse(p.expression)
       while p.consume?(:pipe)
         filtername = p.consume(:id)
diff --git a/test/integration/parsing_quirks_test.rb b/test/integration/parsing_quirks_test.rb
index d005b75..6b84ec5 100644
--- a/test/integration/parsing_quirks_test.rb
+++ b/test/integration/parsing_quirks_test.rb
@@ -118,6 +118,10 @@ class ParsingQuirksTest < Minitest::Test
     end
   end
 
+  def test_blank_variable_markup
+    assert_template_result('', "{{}}")
+  end
+
   def test_contains_in_id
     assert_template_result(' YES ', '{% if containsallshipments == true %} YES {% endif %}', 'containsallshipments' => true)
   end