Add required array element constraints

crates/decodal-language-tools/src/lib.rs

@@ -427,7 +427,7 @@ impl<'a> Formatter<'a> {
         if expression_contains_comment(node)
             && !matches!(
                 node.kind(),
-                "object" | "array" | "let_expression" | "match_expression"
+                "object" | "array" | "array_constraint" | "let_expression" | "match_expression"
             )
         {
             out.push_str(self.raw_trimmed(node));
@@ -454,6 +454,7 @@ impl<'a> Formatter<'a> {
             "comparison_constraint" => self.write_comparison_constraint(out, node, indent),
             "object" => self.write_object(out, node, indent),
             "array" => self.write_array(out, node, indent),
+            "array_constraint" => self.write_array_constraint(out, node, indent),
             "let_expression" => self.write_let(out, node, indent),
             "function_expression" => self.write_function(out, node, indent),
             "match_expression" => self.write_match(out, node, indent),
@@ -541,6 +542,14 @@ impl<'a> Formatter<'a> {
         out.push(']');
     }
 
+    fn write_array_constraint(&mut self, out: &mut String, node: Node<'a>, indent: usize) {
+        out.push_str("[...");
+        if let Some(element) = node.child_by_field_name("element") {
+            self.write_expr(out, element, indent, 0);
+        }
+        out.push(']');
+    }
+
     fn write_let(&mut self, out: &mut String, node: Node<'a>, indent: usize) {
         let body = node.child_by_field_name("body");
         out.push_str("let");
@@ -797,7 +806,7 @@ fn is_inline_expr(node: Node<'_>) -> bool {
             !expression_contains_comment(node)
                 && named_children(node).into_iter().all(is_inline_expr)
         }
-        "array" => {
+        "array" | "array_constraint" => {
             !expression_contains_comment(node)
                 && named_children(node).into_iter().all(is_inline_expr)
         }
@@ -842,6 +851,16 @@ mod tests {
         );
     }
 
+    #[test]
+    fn formats_array_constraints() {
+        let source = "tags=[...String];ports=[...(Int&>=1)];";
+        let formatted = format_source(source).unwrap();
+        assert_eq!(
+            formatted,
+            "tags = [...String];\nports = [...(Int & >= 1)];\n"
+        );
+    }
+
     #[test]
     fn wasm_export_returns_json() {
         let output = format_source_json("value={a=1;};");