feat: add support for camunda variable escaping extension

fixes #36
nikku · Aug 21, 2024 · 52fa949 · 52fa949
1 parent 4f9b608
commit 52fa949
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Showing 2 changed files with 26 additions and 1 deletion.
diff --git a/src/feel.grammar b/src/feel.grammar
@@ -1,3 +1,5 @@
+@dialects { camunda }
+
 @precedence {
   name,
   type,
@@ -322,8 +324,12 @@ Identifier {
   identifier | nameIdentifier
 }
 
+BacktickIdentifier {
+  escapedVariable
+}
+
 VariableName {
-  (!name Identifier ~ident)+
+  (!name Identifier ~ident)+ | BacktickIdentifier
 }
 
 AdditionalIdentifier[@name=Identifier] {
@@ -453,6 +459,10 @@ commaSep<Expr> {
     (digits ("." digits)? | "." digits)
   }
 
+  escapedVariable[@dialect=camunda] {
+    "`" (![\\\n`] | "\\" _)* "`"
+  }
+
   @precedence { BlockComment, LineComment, divide }
 
   @precedence {

diff --git a/test/expressions.txt b/test/expressions.txt
@@ -2619,4 +2619,19 @@ foo[[[[[[[(1..10).start included]]]]]]]
 
 Expression(
   FilterExpression(VariableName(...), List(...))
+)
+
+
+# Camunda escape character { "top": "Expressions", "dialect": "camunda" }
+
+`foo`;
+foo.`bar`;
+foo.`bar-baz`;
+
+==>
+
+Expressions(
+  VariableName(...),
+  PathExpression(VariableName(...), VariableName(...)),
+  PathExpression(VariableName(...), VariableName(...))
 )