<?php

/**
 * Implements hook_element_info().
 */
function elements_element_info() {
  $types['emailfield'] = array(
    '#input' => TRUE,
    '#size' => 60,
    '#maxlength' => 128,
    '#autocomplete_path' => FALSE,
    '#process' => array('ajax_process_form'),
    '#theme' => 'emailfield',
    '#theme_wrappers' => array('form_element'),
  );
  $types['searchfield'] = array(
    '#input' => TRUE,
    '#size' => 60,
    '#maxlength' => 128,
    '#autocomplete_path' => FALSE,
    '#process' => array('ajax_process_form'),
    '#theme' => 'searchfield',
    '#theme_wrappers' => array('form_element'),
  );
  $types['telfield'] = array(
    '#input' => TRUE,
    '#size' => 20,
    '#maxlength' => 64,
    '#process' => array('ajax_process_form'),
    '#theme' => 'telfield',
    '#theme_wrappers' => array('form_element'),
  );
  $types['urlfield'] = array(
    '#input' => TRUE,
    '#size' => 80,
    '#maxlength' => 128,
    '#autocomplete_path' => FALSE,
    '#process' => array('ajax_process_form'),
    '#theme' => 'urlfield',
    '#theme_wrappers' => array('form_element'),
  );
  $types['numberfield'] = array(
    '#input' => TRUE,
    '#process' => array('ajax_process_form'),
    '#theme' => 'numberfield',
    '#theme_wrappers' => array('form_element'),
  );
  $types['rangefield'] = array(
    '#input' => TRUE,
    '#process' => array('ajax_process_form'),
    '#theme' => 'rangefield',
    '#theme_wrappers' => array('form_element'),
  );

  return $types;
}

/**
 * Implements hook_element_info_alter().
 */
function elements_element_info_alter(&$types) {
  // Add placeholder support to textfields and textareas.
  foreach (array_keys($types) as $type) {
    switch ($type) {
      case 'textfield':
      case 'textarea':
        $types[$type]['#process'][] = 'form_process_placeholder';
        break;
    }
  }
}

/**
 * Implements hook_theme().
 */
function elements_theme() {
  return array(
    'emailfield' => array(
      'arguments' => array('element' => NULL),
      'render element' => 'element',
      'file' => 'elements.theme.inc',
    ),
    'searchfield' => array(
      'arguments' => array('element' => NULL),
      'render element' => 'element',
      'file' => 'elements.theme.inc',
    ),
    'telfield' => array(
      'arguments' => array('element' => NULL),
      'render element' => 'element',
      'file' => 'elements.theme.inc',
    ),
    'urlfield' => array(
      'arguments' => array('element' => NULL),
      'render element' => 'element',
      'file' => 'elements.theme.inc',
    ),
    'numberfield' => array(
      'arguments' => array('element' => NULL),
      'render element' => 'element',
      'file' => 'elements.theme.inc',
    ),
    'rangefield' => array(
      'arguments' => array('element' => NULL),
      'render element' => 'element',
      'file' => 'elements.theme.inc',
    ),
  );
}

/**
 * Return the autocompletion HTML for a form element.
 *
 * @param $element
 *   The renderable element to process for autocompletion.
 *
 * @return
 *   The rendered autocompletion element HTML, or an empty string if the field
 *   has no autocompletion enabled.
 */
function elements_add_autocomplete(&$element) {
  $extra = '';

  if (!empty($element['#autocomplete_path']) && drupal_valid_path($element['#autocomplete_path'])) {
    drupal_add_library('system', 'drupal.autocomplete');
    $element['#attributes']['class'][] = 'form-autocomplete';

    $attributes = array();
    $attributes['type'] = 'hidden';
    $attributes['id'] = $element['#attributes']['id'] . '-autocomplete';
    $attributes['value'] = url($element['#autocomplete_path'], array('absolute' => TRUE));
    $attributes['disabled'] = 'disabled';
    $attributes['class'][] = 'autocomplete';
    $extra = '<input' . drupal_attributes($attributes) . ' />';
  }

  return $extra;
}

/**
 * Element process callback; adds support for the HTML5 placeholder attribute.
 *
 * @param $element
 *   An associative array containing the properties of the element.
 *
 * @return
 *   The processed element.
 */
function form_process_placeholder($element) {
  if (isset($element['#placeholder']) && !isset($element['#attributes']['placeholder'])) {
    // If the placeholder FAPI property is set, simply add it to the form's
    // attributes so it will be output in the HTML tag.
    $element['#attributes']['placeholder'] = $element['#placeholder'];
  }
  return $element;
}