update grammar to support #

lib/liquid/block_body.rb

@@ -4,7 +4,7 @@ require 'English'
 
 module Liquid
   class BlockBody
-    LiquidTagToken      = /\A\s*(\w+)\s*(.*?)\z/o
+    LiquidTagToken      = /\A\s*([\w#]+)\s*(.*?)\z/o
     FullToken           = /\A#{TagStart}#{WhitespaceControl}?(\s*)(\w+)(\s*)(.*?)#{WhitespaceControl}?#{TagEnd}\z/om
     ContentOfVariable   = /\A#{VariableStart}#{WhitespaceControl}?(.*?)#{WhitespaceControl}?#{VariableEnd}\z/om
     WhitespaceOrNothing = /\A\s*\z/

lib/liquid/tags/inline_comment.rb

@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+module Liquid
+  class InlineComment < Tag
+    def blank?
+      true
+    end
+
+    def render_to_output_buffer(_context, _output)
+    end
+  end
+
+  Template.register_tag('--', InlineComment)
+end
+

test/integration/inline_comment_test.rb

@@ -0,0 +1,17 @@
+# frozen_string_literal: true
+
+require 'test_helper'
+
+class InlineCommentTest < Minitest::Test
+  include Liquid
+
+  def test_basic_usage
+    template_source = <<-END_TEMPLATE
+    foo{% # this is a comment %}bar
+    END_TEMPLATE
+    template        = Template.parse(template_source)
+    rendered        = template.render!
+    assert_equal("foobar", rendered.strip)
+  end
+end
+