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fields.inc	12.42 KB	-rw-r--r--
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Code Editor : fields.inc

<?php

/**
 * @file
 * Extend core fields with some helper functions to reduce code complexity within views and ctools plugins.
 */

/**
 * Fake an instance of a field.
 *
 * @param $field_name
 *   The unique name for this field no matter what entity/bundle it may be used on.
 * @param $view_mode
 *   We're building a new view mode for this function.  Defaults to ctools, but we expect developers to actually name this something meaningful.
 * @param $formatter
 *   The formatter key selected from the options provided by field_ui_formatter_options().
 * @param $formatter_settings
 *   An array of key value pairs.  These will be used as #default_value for the form elements generated by a call to hook_field_formatter_settings_form() for this field type.
 *   Typically we'll pass an empty array to begin with and then pass this information back to ourselves on form submit so that we can set the values for later edit sessions.
 */
function ctools_fields_fake_field_instance($field_name, $view_mode = 'ctools', $formatter, $formatter_settings) {
  $field = field_read_field($field_name);

$field_type = field_info_field_types($field['type']);

return array(
    // Build a fake entity type and bundle.
    'field_name' => $field_name,
    'entity_type' => 'ctools',
    'bundle' => 'ctools',

// Use the default field settings for settings and widget.
    'settings' => field_info_instance_settings($field['type']),
    'widget' => array(
      'type' => $field_type['default_widget'],
      'settings' => array(),
    ),

// Build a dummy display mode.
    'display' => array(
      $view_mode => array(
        'type' => $formatter,
        'settings' => $formatter_settings,
      ),
    ),

// Set the other fields to their default values.
    // @see _field_write_instance().
    'required' => FALSE,
    'label' => $field_name,
    'description' => '',
    'deleted' => 0,
  );
}

/**
 * Helper function for calling hook_field_formatter_settings_form() without needing to load an instance of the field.
 *
 * @param $field
 *   A fully loaded field.
 * @param $formatter_type
 *   The formatter key selected from the options provided by field_ui_formatter_options().
 * @param $form
 *   The full form from the function that's calling this function.
 * @param $form_state
 *   The full form_state from the function that's calling this function.
 * @param $view_mode
 *   We're passing a view mode from this function to the fake instance we're creating.  Defaults to ctools, but we expect developers to actually name this something meaningful.
 */
function ctools_fields_get_field_formatter_settings_form($field, $formatter_type, &$form, $form_state, $view_mode = 'ctools') {
  $conf = $form_state['conf'];
  $formatter = field_info_formatter_types($formatter_type);
  if (isset($formatter['settings'])) {
    $conf['formatter_settings'] += $formatter['settings'];
  }
  $function = $formatter['module'] . '_field_formatter_settings_form';
  if (function_exists($function)) {
    $instance = ctools_fields_fake_field_instance($field['field_name'], $view_mode, $formatter_type, $conf['formatter_settings']);
    $settings_form = $function($field, $instance, $view_mode, $form, $form_state);
    if ($settings_form) {
      // Allow other modules to alter the formatter settings form.
      $context = array(
        'module' => $formatter['module'],
        'formatter' => $formatter,
        'field' => $field,
        'instance' => $instance,
        'view_mode' => $view_mode,
        'form' => $form,
        'form_state' => $form_state,
      );
      drupal_alter('field_formatter_settings_form', $settings_form, $context);

$settings_form['#tree'] = TRUE;
      $form['ctools_field_list']['#value'][] = $field;
      $form += $settings_form;
    }
  }

if (isset($field['cardinality']) && $field['cardinality'] != 1) {
    list($prefix, $suffix) = explode('@count', t('Skip the first @count item(s)'));
    $form['delta_offset'] = array(
      '#type' => 'textfield',
      '#size' => 5,
      '#field_prefix' => $prefix,
      '#field_suffix' => $suffix,
      '#default_value' => isset($conf['delta_offset']) ? $conf['delta_offset'] : 0,
    );

list($prefix, $suffix) = explode('@count', t('Then display at most @count item(s)'));
    $form['delta_limit'] = array(
      '#type' => 'textfield',
      '#size' => 5,
      '#field_prefix' => $prefix,
      '#field_suffix' => $suffix,
      '#description' => t('Enter 0 to display all items.'),
      '#default_value' => isset($conf['delta_limit']) ? $conf['delta_limit'] : 0,
    );

$form['delta_reversed'] = array(
      '#title' => t('Display in reverse order'),
      '#type' => 'checkbox',
      '#default_value' => !empty($conf['delta_reversed']),
      '#description' => t('(start from last values)'),
    );
  }
}

/**
 * Helper function for generating all the formatter information associated with
 * any fields.
 * Especially useful for determining the fields that will be added to form that
 * executes hook_field_formatter_settings_form().
 *
 * @param $fields
 *   An array of fully loaded fields.
 */
function ctools_fields_get_field_formatter_info($fields) {
  $info = array();
  $field_info = module_invoke_all('field_formatter_info');
  foreach ($fields as $field) {
    foreach ($field_info as $format_name => $formatter_info) {
      if (in_array($field['type'], $formatter_info['field types'])) {
        $info += array($format_name => $formatter_info);
      }
    }
  }
  drupal_alter('field_formatter_info', $info);
  return $info;
}

/**
 * Returns the label of a certain field.
 *
 * Cribbed from Views.
 */
function ctools_field_label($field_name) {
  $label_counter = array();
  // Count the amount of instances per label per field.
  $instances = field_info_instances();
  foreach ($instances as $entity_type) {
    foreach ($entity_type as $bundle) {
      if (isset($bundle[$field_name])) {
        $label_counter[$bundle[$field_name]['label']] = isset($label_counter[$bundle[$field_name]['label']]) ? ++$label_counter[$bundle[$field_name]['label']] : 1;
      }
    }
  }
  if (empty($label_counter)) {
    return $field_name;
  }
  // Sort the field lables by it most used label and return the most used one.
  arsort($label_counter);
  $label_counter = array_keys($label_counter);
  return $label_counter[0];
}

/**
 * Replacement for core _field_invoke() to invoke on a single field.
 *
 * Core only allows invoking field hooks via a private function for all fields
 * on an entire entity. However, we very often need to invoke our hooks on
 * a single field as we take things apart and only use little bits.
 *
 * @param $field_name
 *   Either a field instance object or the name of the field.
 *   If the 'field' key is populated it will be used as the field
 *   settings.
 * @param $op
 *   Possible operations include:
 *   - form
 *   - validate
 *   - presave
 *   - insert
 *   - update
 *   - delete
 *   - delete revision
 *   - view
 *   - prepare translation
 * @param $entity_type
 *   The type of $entity; e.g. 'node' or 'user'.
 * @param $entity
 *   The fully formed $entity_type entity.
 * @param $a
 *   - The $form in the 'form' operation.
 *   - The value of $view_mode in the 'view' operation.
 *   - Otherwise NULL.
 * @param $b
 *   - The $form_state in the 'submit' operation.
 *   - Otherwise NULL.
 * @param $options
 *   An associative array of additional options, with the following keys:
 *  - 'field_name': The name of the field whose operation should be
 *    invoked. By default, the operation is invoked on all the fields
 *    in the entity's bundle. NOTE: This option is not compatible with
 *    the 'deleted' option; the 'field_id' option should be used
 *    instead.
 *  - 'field_id': The id of the field whose operation should be
 *    invoked. By default, the operation is invoked on all the fields
 *    in the entity's' bundles.
 *  - 'default': A boolean value, specifying which implementation of
 *    the operation should be invoked.
 *    - if FALSE (default), the field types implementation of the operation
 *      will be invoked (hook_field_[op])
 *    - If TRUE, the default field implementation of the field operation
 *      will be invoked (field_default_[op])
 *    Internal use only. Do not explicitely set to TRUE, but use
 *    _field_invoke_default() instead.
 *  - 'deleted': If TRUE, the function will operate on deleted fields
 *    as well as non-deleted fields. If unset or FALSE, only
 *    non-deleted fields are operated on.
 *  - 'language': A language code or an array of language codes keyed by field
 *    name. It will be used to narrow down to a single value the available
 *    languages to act on.
 *
 * @see _field_invoke()
 */
function ctools_field_invoke_field($field_name, $op, $entity_type, $entity, &$a = NULL, &$b = NULL, $options = array()) {
  if (is_array($field_name)) {
    $instance = $field_name;
    $field = empty($field_name['field']) ? field_info_field($instance['field_name']) : $field_name['field'];
    $field_name = $instance['field_name'];
  }
  else {
    list(, , $bundle) = entity_extract_ids($entity_type, $entity);
    $instance = field_info_instance($entity_type, $field_name, $bundle);
  }

if (empty($instance)) {
    return;
  }

// Merge default options.
  $default_options = array(
    'default' => FALSE,
    'deleted' => FALSE,
    'language' => NULL,
  );
  $options += $default_options;

$return = array();

// Everything from here is unmodified code from _field_invoke() formerly
  // inside a foreach loop over the instances.
  $function = $options['default'] ? 'field_default_' . $op : $field['module'] . '_field_' . $op;
  if (function_exists($function)) {
    // Determine the list of languages to iterate on.
    $available_languages = field_available_languages($entity_type, $field);
    $languages = _field_language_suggestion($available_languages, $options['language'], $field_name);

foreach ($languages as $langcode) {
      $items = isset($entity->{$field_name}[$langcode]) ? $entity->{$field_name}[$langcode] : array();
      $result = $function($entity_type, $entity, $field, $instance, $langcode, $items, $a, $b);
      if (isset($result)) {
        // For hooks with array results, we merge results together.
        // For hooks with scalar results, we collect results in an array.
        if (is_array($result)) {
          $return = array_merge($return, $result);
        }
        else {
          $return[] = $result;
        }
      }

// Populate $items back in the field values, but avoid replacing missing
      // fields with an empty array (those are not equivalent on update).
      if ($items !== array() || isset($entity->{$field_name}[$langcode])) {
        $entity->{$field_name}[$langcode] = $items;
      }
    }
  }

return $return;
}

/**
 * Replacement for core _field_invoke_default() to invoke on a single field.
 *
 * @see ctools_field_invoke_field()
 * @see _field_invoke_default()
 */
function ctools_field_invoke_field_default($field_name, $op, $entity_type, $entity, &$a = NULL, &$b = NULL, $options = array()) {
  $options['default'] = TRUE;
  return ctools_field_invoke_field($field_name, $op, $entity_type, $entity, $a, $b, $options);
}

/**
 * Returns a list of field definitions of a specified type.
 *
 * @param string $field_type
 *   A field type name; e.g. 'text' or 'date'.
 *
 * @return array
 *   An array of field definitions of the specified type, keyed by field name.
 */
function ctools_fields_get_fields_by_type($field_type) {
  $fields = array();
  foreach (field_info_fields() as $field_name => $field_info) {
    if ($field_info['type'] == $field_type) {
      $fields[$field_name] = $field_info;
    }
  }
  return $fields;
}

/**
 * Derive the foreign keys that a field provides.
 *
 * @param $field_name
 *   The name of the field.
 *
 * @return
 *   An array of foreign keys according to Schema API.
 */
function ctools_field_foreign_keys($field_name) {
  $foreign_keys = &drupal_static(__FUNCTION__, array());
  if (!isset($foreign_keys[$field_name])) {
    $foreign_keys[$field_name] = array();
    $field = field_info_field($field_name);

if (!empty($field['foreign keys'])) {
      $foreign_keys[$field_name] = $field['foreign keys'];
    }
    else {
      // try to fetch foreign keys from schema, as not everything
      // stores foreign keys properly in the field info.
      $module = $field['module'];

module_load_install($module);
      $schema = module_invoke($module, 'field_schema', $field);
      if (!empty($schema['foreign keys'])) {
        $foreign_keys[$field_name] = $schema['foreign keys'];
      }
    }
  }

return $foreign_keys[$field_name];
}

${this.title}

Code Editor : fields.inc