<?php
/**
 * @file
 * Entity reference autofill addressfield module.
 */

/**
 * Implements hook_entityreference_autofill_fill_items_alter().
 */
function entityreference_autofill_addressfield_entityreference_autofill_fill_items_alter(&$form_state, $context) {
  // Add entityreference autofill support to addressfield module.
  if ($context['field']['type'] == 'addressfield') {
    // Generate element key for addressfield form state.
    // @see addressfield_field_widget_form()
    $element_key_parts = array(
      $context['instance']['entity_type'],
      $context['instance']['bundle'],
      $context['field']['field_name'],
      $context['langcode'],
    );
    $element_key_base = implode('|', $element_key_parts);
    // Add form_state data for each addressfield value
    // from referenced entity.
    foreach ($context['items'] as $delta => $item) {
      $element_key = $element_key_base . '|' . $delta;
      // Add item to addressfield form_state.
      $form_state['addressfield'][$element_key] = $item;
    }
  }
}