runWithReporter method

@override void runWithReporter(SaropaDiagnosticReporter reporter, SaropaContext context)

Override this method to implement your lint rule.

Use context to register callbacks for AST node types:

context.addMethodInvocation((node) {
  if (condition) {
    reporter.atNode(node);
  }
});

Implementation

@override
void runWithReporter(
  SaropaDiagnosticReporter reporter,
  SaropaContext context,
) {
  context.addMethodDeclaration((MethodDeclaration node) {
    // Extensions and extension types cannot have instance fields —
    // caching is impossible.
    if (node.thisOrAncestorOfType<ExtensionDeclaration>() != null ||
        node.thisOrAncestorOfType<ExtensionTypeDeclaration>() != null) {
      return;
    }

    // Static methods cannot cache to instance fields either.
    if (node.isStatic) return;

    // Analyze the method body for repeated getter calls
    final Map<String, List<AstNode>> getterCalls = <String, List<AstNode>>{};

    node.body.visitChildren(_GetterCallCollector(getterCalls));

    for (final MapEntry<String, List<AstNode>> entry in getterCalls.entries) {
      if (entry.value.length > 1) {
        // Heuristic: skip reporting if getter is an Isar/single-subscription stream
        final String getterSource = entry.key;
        if (_isSingleSubscriptionStream(getterSource)) {
          continue;
        }
        reporter.atNode(entry.value[1], code);
      }
    }
  });
}