feat: add support for backtick escaped variables (Camunda extension)

* Adds `camunda` dialect * Adds support for backtick escaped variables, i.e. foo.`boo ba` * Must be explicitly enabled via `camunda` dialect Closes #36
nikku · Aug 21, 2024 · ee59237 · ee59237
1 parent 4f9b608
commit ee59237
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Showing 4 changed files with 40 additions and 2 deletions.
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 {
+  backtickIdentifier
+}
+
 VariableName {
-  (!name Identifier ~ident)+
+  (!name Identifier ~ident)+ | BacktickIdentifier
 }
 
 AdditionalIdentifier[@name=Identifier] {
@@ -453,6 +459,10 @@ commaSep<Expr> {
     (digits ("." digits)? | "." digits)
   }
 
+  backtickIdentifier[@dialect=camunda] {
+    "`" (![\\\n`] | "\\" _)* "`"
+  }
+
   @precedence { BlockComment, LineComment, divide }
 
   @precedence {

diff --git a/test/camunda.txt b/test/camunda.txt
@@ -0,0 +1,13 @@
+# VariableName (backtick escaped) { "top": "Expressions", "dialect": "camunda" }
+
+`foo`;
+foo.`bar`;
+foo.`bar-baz`;
+
+==>
+
+Expressions(
+  VariableName(BacktickIdentifier(...)),
+  PathExpression(VariableName(...), VariableName(BacktickIdentifier(...))),
+  PathExpression(VariableName(...), VariableName(BacktickIdentifier(...)))
+)
diff --git a/test/expressions.txt b/test/expressions.txt
@@ -2619,4 +2619,19 @@ foo[[[[[[[(1..10).start included]]]]]]]
 
 Expression(
   FilterExpression(VariableName(...), List(...))
+)
+
+
+# Backtick escaped variables (Camunda) { "top": "Expressions", "dialect": "camunda" }
+
+`foo`;
+foo.`bar`;
+foo.`bar-baz`;
+
+==>
+
+Expressions(
+  VariableName(...),
+  PathExpression(VariableName(...), VariableName(...)),
+  PathExpression(VariableName(...), VariableName(...))
 )
diff --git a/test/test-feel.js b/test/test-feel.js
@@ -171,7 +171,7 @@ for (const file of fs.readdirSync(caseDir)) {
       }) : parser;
     };
 
-    const contextTracker = /expressions|unary-test/.test(fileName)
+    const contextTracker = /expressions|unary-test|camunda/.test(fileName)
       ? trackVariables
       : null;