Support for custom syntax '???'

closes #39
moetelo · Nov 16, 2024 · 95079d6 · 95079d6
1 parent b88c97b
commit 95079d6
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diff --git a/packages/tree-sitter-twig/corpus/expressions.txt b/packages/tree-sitter-twig/corpus/expressions.txt
@@ -553,6 +553,22 @@ Ternary operator short
       (variable)
       (string))))
 
+==================
+Empty Coalesce
+==================
+{% set choice = thingOne ??? thingTwo ??? thingThree ??? thingFour %}
+---
+(template
+  (set
+    (variable)
+    (binary_expression
+      (variable)
+      (binary_expression
+        (variable)
+        (binary_expression
+          (variable)
+          (variable))))))
+
 ==================
 Filter without arguments
 ==================

diff --git a/packages/tree-sitter-twig/grammar.js b/packages/tree-sitter-twig/grammar.js
@@ -353,6 +353,7 @@ module.exports = grammar({
           ['is same as', 100],
           ['**', 200, 'right'],
           ['??', 300, 'right'],
+          ['???', 300, 'right'], // https://nystudio107.com/docs/empty-coalesce
         ]).map(([operator, precedence, associativity = 'left']) =>
           prec[associativity](
             precedence,