Fix bugs in RecursiveStatementVisitor (#824)

`AtRootRule.query` and `Declaration.value` can be null, so this should be checked before passing them on to `visitInterpolation` and `visitExpression`.
sass · Sep 23, 2019 · 553cf9a · 553cf9a
1 parent 42ac7a8
commit 553cf9a
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/lib/src/visitor/recursive_statement.dart b/lib/src/visitor/recursive_statement.dart
@@ -23,7 +23,7 @@ import 'interface/statement.dart';
 /// The default implementation of the visit methods all return `null`.
 abstract class RecursiveStatementVisitor<T> implements StatementVisitor<T> {
   T visitAtRootRule(AtRootRule node) {
-    visitInterpolation(node.query);
+    if (node.query != null) visitInterpolation(node.query);
     return visitChildren(node);
   }
 
@@ -47,7 +47,7 @@ abstract class RecursiveStatementVisitor<T> implements StatementVisitor<T> {
 
   T visitDeclaration(Declaration node) {
     visitInterpolation(node.name);
-    visitExpression(node.value);
+    if (node.value != null) visitExpression(node.value);
     return node.children == null ? null : visitChildren(node);
   }