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Drupal example source code file (text.module)

This example Drupal source code file (text.module) is included in the DevDaily.com "Drupal Source Code Warehouse" project. The intent of this project is to help you "Learn Drupal by Example".

PHP - Drupal tags/keywords

array, delta, element, empty, field, function, if, null, php, return, the, title, type, value

The text.module Drupal example source code

<?php
// $Id: text.module,v 1.95.2.32 2011/01/03 14:29:09 yched Exp $

/**
 * @file
 * Defines simple text field types.
 */

/**
 * Implementation of hook_theme().
 */
function text_theme() {
  return array(
    'text_textarea' => array(
      'arguments' => array('element' => NULL),
    ),
    'text_textfield' => array(
      'arguments' => array('element' => NULL),
    ),
    'text_formatter_default' => array(
      'arguments' => array('element' => NULL),
    ),
    'text_formatter_plain' => array(
      'arguments' => array('element' => NULL),
    ),
    'text_formatter_trimmed' => array(
      'arguments' => array('element' => NULL),
    ),
    'text_formatter_foo' => array(
      'arguments' => array('element' => NULL),
    ),
  );
}

/**
 * Implementation of hook_field_info().
 */
function text_field_info() {
  return array(
    'text' => array(
      'label' => t('Text'),
      'description' => t('Store text in the database.'),
//      'content_icon' => 'icon_content_text.png',
    ),
  );
}

/**
 * Implementation of hook_field_settings().
 */
function text_field_settings($op, $field) {
  switch ($op) {
    case 'form':
      $form = array();
      $options = array(0 => t('Plain text'), 1 => t('Filtered text (user selects input format)'));
      $form['text_processing'] = array(
        '#type' => 'radios',
        '#title' => t('Text processing'),
        '#default_value' => is_numeric($field['text_processing']) ? $field['text_processing'] : 0,
        '#options' => $options,
      );
      $form['max_length'] = array(
        '#type' => 'textfield',
        '#title' => t('Maximum length'),
        '#default_value' => is_numeric($field['max_length']) ? $field['max_length'] : '',
        '#required' => FALSE,
        '#element_validate' => array('_element_validate_integer_positive'),
        '#description' => t('The maximum length of the field in characters. Leave blank for an unlimited size.'),
      );
      $form['allowed_values_fieldset'] = array(
        '#type' => 'fieldset',
        '#title' => t('Allowed values'),
        '#collapsible' => TRUE,
        '#collapsed' => TRUE,
      );
      $form['allowed_values_fieldset']['allowed_values'] = array(
        '#type' => 'textarea',
        '#title' => t('Allowed values list'),
        '#default_value' => !empty($field['allowed_values']) ? $field['allowed_values'] : '',
        '#required' => FALSE,
        '#rows' => 10,
        '#description' => t('The possible values this field can contain. Enter one value per line, in the format key|label. The key is the value that will be stored in the database, and it must match the field storage type (%type). The label is optional, and the key will be used as the label if no label is specified.<br />Allowed HTML tags: @tags', array('%type' => $field['type'], '@tags' => _content_filter_xss_display_allowed_tags())),
      );
      $form['allowed_values_fieldset']['advanced_options'] = array(
        '#type' => 'fieldset',
        '#title' => t('PHP code'),
        '#collapsible' => TRUE,
        '#collapsed' => empty($field['allowed_values_php']),
      );
      if (user_access('Use PHP input for field settings (dangerous - grant with care)')) {
        $form['allowed_values_fieldset']['advanced_options']['allowed_values_php'] = array(
          '#type' => 'textarea',
          '#title' => t('Code'),
          '#default_value' => !empty($field['allowed_values_php']) ? $field['allowed_values_php'] : '',
          '#rows' => 6,
          '#description' => t('Advanced usage only: PHP code that returns a keyed array of allowed values. Should not include <?php ?> delimiters. If this field is filled out, the array returned by this code will override the allowed values list above.'),
        );
      }
      else {
        $form['allowed_values_fieldset']['advanced_options']['markup_allowed_values_php'] = array(
          '#type' => 'item',
          '#title' => t('Code'),
          '#value' => !empty($field['allowed_values_php']) ? '<code>'. check_plain($field['allowed_values_php']) .'</code>' : t('<none>'),
          '#description' => empty($field['allowed_values_php']) ? t("You're not allowed to input PHP code.") : t('This PHP code was set by an administrator and will override the allowed values list above.'),
        );
      }
      return $form;

    case 'save':
      return array('text_processing', 'max_length', 'allowed_values', 'allowed_values_php');

    case 'database columns':
      if (empty($field['max_length']) || $field['max_length'] > 255) {
        $columns['value'] = array('type' => 'text', 'size' => 'big', 'not null' => FALSE, 'sortable' => TRUE, 'views' => TRUE);
      }
      else {
        $columns['value'] = array('type' => 'varchar', 'length' => $field['max_length'], 'not null' => FALSE, 'sortable' => TRUE, 'views' => TRUE);
      }
      if (!empty($field['text_processing'])) {
        $columns['format'] = array('type' => 'int', 'unsigned' => TRUE, 'not null' => FALSE, 'views' => FALSE);
      }
      return $columns;

    case 'views data':
      $allowed_values = content_allowed_values($field);
      if (count($allowed_values)) {
        $data = content_views_field_views_data($field);
        $db_info = content_database_info($field);
        $table_alias = content_views_tablename($field);

        // Filter: Add a 'many to one' filter.
        $copy = $data[$table_alias][$field['field_name'] .'_value'];
        $copy['title'] = t('@label (!name) - Allowed values', array('@label' => t($field['widget']['label']), '!name' => $field['field_name']));
        $copy['filter']['handler'] = 'content_handler_filter_many_to_one';
        unset($copy['field'], $copy['argument'], $copy['sort']);
        $data[$table_alias][$field['field_name'] .'_value_many_to_one'] = $copy;
        // Argument : swap the handler to the 'many to one' operator.
        $data[$table_alias][$field['field_name'] .'_value']['argument']['handler'] = 'content_handler_argument_many_to_one';
        return $data;
      }
  }
}

/**
 * Implementation of hook_field().
 */
function text_field($op, &$node, $field, &$items, $teaser, $page) {
  switch ($op) {
    case 'validate':
      $allowed_values = content_allowed_values($field);
      if (is_array($items)) {
        foreach ($items as $delta => $item) {
          $error_element = isset($item['_error_element']) ? $item['_error_element'] : '';
          if (is_array($item) && isset($item['_error_element'])) unset($item['_error_element']);
          if (!empty($item['value'])) {
            if (count($allowed_values) && !array_key_exists($item['value'], $allowed_values)) {
              form_set_error($error_element, t('%name: illegal value.', array('%name' => t($field['widget']['label']))));
            }
            if (!empty($field['max_length']) && drupal_strlen($item['value']) > $field['max_length']) {
              form_set_error($error_element, t('%name: the value may not be longer than %max characters.', array('%name' => $field['widget']['label'], '%max' => $field['max_length'])));
            }
          }
        }
      }
      return $items;

    case 'sanitize':
      foreach ($items as $delta => $item) {
        if (!empty($field['text_processing'])) {
          $text = isset($item['value']) ? check_markup($item['value'], $item['format'], FALSE) : '';
        }
        else {
          $text = isset($item['value']) ? check_plain($item['value']) : '';
        }
        $items[$delta]['safe'] = $text;
      }
  }
}

/**
 * Implementation of hook_content_is_empty().
 */
function text_content_is_empty($item, $field) {
  if (empty($item['value']) && (string)$item['value'] !== '0') {
    return TRUE;
  }
  return FALSE;
}

/**
 * Implementation of hook_field_formatter_info().
 */
function text_field_formatter_info() {
  return array(
    'default' => array(
      'label' => t('Default'),
      'field types' => array('text'),
      'multiple values' => CONTENT_HANDLE_CORE,
    ),
    'plain' => array(
      'label' => t('Plain text'),
      'field types' => array('text'),
      'multiple values' => CONTENT_HANDLE_CORE,
    ),
    'trimmed' => array(
      'label' => t('Trimmed'),
      'field types' => array('text'),
      'multiple values' => CONTENT_HANDLE_CORE,
    ),
  );
}

/**
 * Theme function for 'default' text field formatter.
 */
function theme_text_formatter_default($element) {
  return ($allowed =_text_allowed_values($element)) ? $allowed : $element['#item']['safe'];
}

/**
 * Theme function for 'plain' text field formatter.
 */
function theme_text_formatter_plain($element) {
  return ($allowed =_text_allowed_values($element)) ? $allowed : strip_tags($element['#item']['safe']);
}

/**
 * Theme function for 'trimmed' text field formatter.
 */
function theme_text_formatter_trimmed($element) {
  $field = content_fields($element['#field_name'], $element['#type_name']);
  return ($allowed =_text_allowed_values($element)) ? $allowed : node_teaser($element['#item']['safe'], $field['text_processing'] ? $element['#item']['format'] : NULL);
}

function _text_allowed_values($element) {
  $field = content_fields($element['#field_name'], $element['#type_name']);
  if (($allowed_values = content_allowed_values($field)) && isset($allowed_values[$element['#item']['value']])) {
    return $allowed_values[$element['#item']['value']];
  }
}

/**
 * Implementation of hook_widget_info().
 *
 * Here we indicate that the content module will handle
 * the default value and multiple values for these widgets.
 *
 * Callbacks can be omitted if default handing is used.
 * They're included here just so this module can be used
 * as an example for custom modules that might do things
 * differently.
 */
function text_widget_info() {
  return array(
    'text_textfield' => array(
      'label' => t('Text field'),
      'field types' => array('text'),
      'multiple values' => CONTENT_HANDLE_CORE,
      'callbacks' => array(
        'default value' => CONTENT_CALLBACK_DEFAULT,
      ),
    ),
    'text_textarea' => array(
      'label' => t('Text area (multiple rows)'),
      'field types' => array('text'),
      'multiple values' => CONTENT_HANDLE_CORE,
      'callbacks' => array(
        'default value' => CONTENT_CALLBACK_DEFAULT,
      ),
    ),
  );
}

/**
 * Implementation of FAPI hook_elements().
 *
 * Any FAPI callbacks needed for individual widgets can be declared here,
 * and the element will be passed to those callbacks for processing.
 *
 * Drupal will automatically theme the element using a theme with
 * the same name as the hook_elements key.
 *
 * Autocomplete_path is not used by text_widget but other widgets can use it
 * (see nodereference and userreference).
 */
function text_elements() {
  return array(
    'text_textfield' => array(
      '#input' => TRUE,
      '#columns' => array('value'), '#delta' => 0,
      '#process' => array('text_textfield_process'),
      '#autocomplete_path' => FALSE,
    ),
    'text_textarea' => array(
      '#input' => TRUE,
      '#columns' => array('value', 'format'), '#delta' => 0,
      '#process' => array('text_textarea_process'),
      '#filter_value' => FILTER_FORMAT_DEFAULT,
    ),
  );
}

/**
 * Implementation of hook_widget_settings().
 */
function text_widget_settings($op, $widget) {
  switch ($op) {
    case 'form':
      $form = array();
      $rows = (isset($widget['rows']) && is_numeric($widget['rows'])) ? $widget['rows'] : 5;
      $size = (isset($widget['size']) && is_numeric($widget['size'])) ? $widget['size'] : 60;
      if ($widget['type'] == 'text_textfield') {
        $form['rows'] = array('#type' => 'hidden', '#value' => $rows);
        $form['size'] = array(
          '#type' => 'textfield',
          '#title' => t('Size of textfield'),
          '#default_value' => $size,
          '#element_validate' => array('_element_validate_integer_positive'),
          '#required' => TRUE,
        );
      }
      else {
        $form['rows'] = array(
          '#type' => 'textfield',
          '#title' => t('Rows'),
          '#default_value' => $rows,
          '#element_validate' => array('_element_validate_integer_positive'),
          '#required' => TRUE,
        );
        $form['size'] = array('#type' => 'hidden', '#value' => $size);
      }
      return $form;

    case 'save':
      return array('rows', 'size');
  }
}

/**
 * Implementation of hook_widget().
 *
 * Attach a single form element to the form. It will be built out and
 * validated in the callback(s) listed in hook_elements. We build it
 * out in the callbacks rather than here in hook_widget so it can be
 * plugged into any module that can provide it with valid
 * $field information.
 *
 * Content module will set the weight, field name and delta values
 * for each form element. This is a change from earlier CCK versions
 * where the widget managed its own multiple values.
 *
 * If there are multiple values for this field, the content module will
 * call this function as many times as needed.
 *
 * @param $form
 *   the entire form array, $form['#node'] holds node information
 * @param $form_state
 *   the form_state, $form_state['values'][$field['field_name']]
 *   holds the field's form values.
 * @param $field
 *   the field array
 * @param $items
 *   array of default values for this field
 * @param $delta
 *   the order of this item in the array of subelements (0, 1, 2, etc)
 *
 * @return
 *   the form item for a single element for this field
 */
function text_widget(&$form, &$form_state, $field, $items, $delta = 0) {
  $element = array(
    '#type' => $field['widget']['type'],
    '#default_value' => isset($items[$delta]) ? $items[$delta] : '',
  );
  return $element;
}

/**
 * Process an individual element.
 *
 * Build the form element. When creating a form using FAPI #process,
 * note that $element['#value'] is already set.
 *
 * The $fields array is in $form['#field_info'][$element['#field_name']].
 */
function text_textfield_process($element, $edit, $form_state, $form) {
  $field = $form['#field_info'][$element['#field_name']];
  $field_key = $element['#columns'][0];
  $delta = $element['#delta'];
  $element[$field_key] = array(
    '#type' => 'textfield',
    '#default_value' => isset($element['#value'][$field_key]) ? $element['#value'][$field_key] : NULL,
    '#autocomplete_path' => $element['#autocomplete_path'],
    '#size' => !empty($field['widget']['size']) ? $field['widget']['size'] : 60,
    '#attributes' => array('class' => 'text'),
    // The following values were set by the content module and need
    // to be passed down to the nested element.
    '#title' => $element['#title'],
    '#description' => $element['#description'],
    '#required' => $element['#required'],
    '#field_name' => $element['#field_name'],
    '#type_name' => $element['#type_name'],
    '#delta' => $element['#delta'],
    '#columns' => $element['#columns'],
  );

  $element[$field_key]['#maxlength'] = !empty($field['max_length']) ? $field['max_length'] : NULL;

  if (!empty($field['text_processing'])) {
    $filter_key = $element['#columns'][1];
    $format = isset($element['#value'][$filter_key]) ? $element['#value'][$filter_key] : FILTER_FORMAT_DEFAULT;
    $parents = array_merge($element['#parents'] , array($filter_key));
    $element[$filter_key] = filter_form($format, 1, $parents);
  }

  // Used so that hook_field('validate') knows where to flag an error.
  $element['_error_element'] = array(
    '#type' => 'value',
    '#value' => implode('][', array_merge($element['#parents'], array($field_key))),
  );

  return $element;
}

/**
 * Process an individual element.
 *
 * Build the form element. When creating a form using FAPI #process,
 * note that $element['#value'] is already set.
 *
 * The $fields array is in $form['#field_info'][$element['#field_name']].
 */
function text_textarea_process($element, $edit, $form_state, $form) {
  $field = $form['#field_info'][$element['#field_name']];
  $field_key   = $element['#columns'][0];
  $element[$field_key] = array(
    '#type' => 'textarea',
    '#default_value' => isset($element['#value'][$field_key]) ? $element['#value'][$field_key] : NULL,
    '#rows' => !empty($field['widget']['rows']) ? $field['widget']['rows'] : 10,
    '#weight' => 0,
    // The following values were set by the content module and need
    // to be passed down to the nested element.
    '#title' => $element['#title'],
    '#description' => $element['#description'],
    '#required' => $element['#required'],
    '#field_name' => $element['#field_name'],
    '#type_name' => $element['#type_name'],
    '#delta' => $element['#delta'],
    '#columns' => $element['#columns'],
  );

  if (!empty($field['text_processing'])) {
    $filter_key  = (count($element['#columns']) == 2) ? $element['#columns'][1] : 'format';
    $format = isset($element['#value'][$filter_key]) ? $element['#value'][$filter_key] : FILTER_FORMAT_DEFAULT;
    $parents = array_merge($element['#parents'] , array($filter_key));
    $element[$filter_key] = filter_form($format, 1, $parents);
  }

  // Used so that hook_field('validate') knows where to flag an error.
  $element['_error_element'] = array(
    '#type' => 'value',
    '#value' => implode('][', array_merge($element['#parents'], array($field_key))),
  );

  return $element;
}

/**
 * FAPI theme for an individual text elements.
 *
 * The textfield or textarea is already rendered by the
 * textfield or textarea themes and the html output
 * lives in $element['#children']. Override this theme to
 * make custom changes to the output.
 *
 * $element['#field_name'] contains the field name
 * $element['#delta]  is the position of this element in the group
 */
function theme_text_textfield($element) {
  return $element['#children'];
}

function theme_text_textarea($element) {
  return $element['#children'];
}

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