Handle undocumented whitespace parsing in variables

diff --git a/grammar.ebnf b/grammar.ebnf
index 5960a1a6e3c75874a17b6a1c2d8e70ce60f5eb42..70201d88589c02cd52b5c608048489ef3ee27f99 100644 (file)
--- a/grammar.ebnf
+++ b/grammar.ebnf
@@ -148,11 +148,13 @@ variable_expression
     ;\r
 variable_open\r
     =\r
-    @:"{{" {SP}*\r
+    | @:"{{" {SP}*\r
+    | {SP}* @:"{{-" {SP}*\r
     ;\r
 variable_close\r
     =\r
-    {SP}* @:"}}"\r
+    | {SP}* @:"}}"\r
+    | {SP}* @:"-}}" {SP}*\r
     ;\r
 \r
 variable_identifier\r