<?php

/**
 * @file
 * Placeholder module file.
 */

/**
 * Implements hook_element_info_alter().
 */
function placeholder_element_info_alter(&$types) {
  foreach (array_keys($types) as $type) {
    switch ($type) {
      case 'textfield':
      case 'textarea':
      case 'password':
        $types[$type]['#process'][] = 'placeholder_process_placeholder';
        break;
    }
  }
}

/**
 * Element process callback. Adds support for the HTML5 placeholder attribute.
 *
 * @param array $element
 *   The render array element.
 *
 * @return
 *   The processed element.
 */
function placeholder_process_placeholder($element) {
  if (isset($element['#placeholder']) || isset($element['#attributes']['placeholder'])) {
    // Set the placeholder attribute, if we need to.
    if (!isset($element['#attributes']['placeholder'])) {
      $element['#attributes']['placeholder'] = $element['#placeholder'];
    }
    // Add the library, if it's available.
    if (($library = libraries_detect('placeholder')) && !empty($library['installed'])) {
      // Attach the library files.
      $element['#attached']['libraries_load'][] = array('placeholder');
    }
  }

  return $element;
}

/**
 * Implements hook_libraries_info().
 */
function placeholder_libraries_info() {
  $libraries = array();

  $libraries['placeholder'] = array(
    'title' => 'jQuery-Placeholder',
    'vendor url' => 'https://github.com/mathiasbynens/jquery-placeholder',
    'version' => '1.0',
    'files' => array(
      'js' => array(
        'jquery.placeholder.js',
      ),
    ),
    'integration files' => array(
      'placeholder' => array(
        'js' => array('placeholder.js' => array()),
      ),
    ),
    'post-load integration files' => TRUE,
  );

  return $libraries;
}