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FactoryClosureMapper

Builds a mapper dynamically at bind time. The closure receives the BindBoundary and BindContext (injectable by type hint) and returns a Mapper, which is then run against the current bindables. Returning null leaves the bindables unchanged.

This lets you choose mappers based on other values in the bind context — e.g. a validation range taken from a sibling prop.

Example: choosing a mapper from a sibling value​

$target = new DataMap();
Bind::attrs(['minNum' => 2, 'maxNum' => 4])->toAttrs($target)
        ->optProp('maxNum', Mappers::factoryClosure(function (BindContext $bindContext) {
            $minNum = $bindContext->getValue('minNum');
            return Mappers::value(fn (int $maxNum) => $maxNum + 1);
        }))
        ->optProp('minNum', Mappers::int())
        ->exec();
var_dump($target->toArray());

Output:

array(2) {
  ["minNum"]=>
  int(2)
  ["maxNum"]=>
  int(5)
}

The factory closure reads minNum from the context and returns a value mapper that increments maxNum. If the closure returns null, maxNum passes through unchanged.