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.addInstanceCreationExpression((InstanceCreationExpression node) {
    final typeName = node.constructorName.type.name.lexeme;
    if (typeName != 'TextFormField') return;

    // Check if the TextFormField has a validator parameter (indicates form usage)
    bool hasValidator = false;
    for (final arg in node.argumentList.arguments) {
      if (arg is NamedExpression && arg.name.label.name == 'validator') {
        hasValidator = true;
        break;
      }
    }

    if (!hasValidator) return; // No validator = probably OK to not have Form

    // Walk up looking for Form constructor
    AstNode? current = node.parent;
    bool foundForm = false;
    int depth = 0;
    const maxDepth = 50; // Reasonable widget tree depth

    while (current != null && depth < maxDepth) {
      if (current is InstanceCreationExpression) {
        final parentType = current.constructorName.type.name.lexeme;
        if (parentType == 'Form') {
          foundForm = true;
          break;
        }
      }
      current = current.parent;
      depth++;
    }

    if (!foundForm) {
      reporter.atNode(node.constructorName, code);
    }
  });
}