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+<?php
+
+/**
+ * @file
+ * Controls the visual building blocks a page is constructed with.
+ */
+
+/**
+ * Denotes that a block is not enabled in any region and should not be shown.
+ */
+define('BLOCK_REGION_NONE', -1);
+
+/**
+ * Users cannot control whether or not they see this block.
+ */
+define('BLOCK_CUSTOM_FIXED', 0);
+
+/**
+ * Shows this block by default, but lets individual users hide it.
+ */
+define('BLOCK_CUSTOM_ENABLED', 1);
+
+/**
+ * Hides this block by default but lets individual users show it.
+ */
+define('BLOCK_CUSTOM_DISABLED', 2);
+
+/**
+ * Shows this block on every page except the listed pages.
+ */
+define('BLOCK_VISIBILITY_NOTLISTED', 0);
+
+/**
+ * Shows this block on only the listed pages.
+ */
+define('BLOCK_VISIBILITY_LISTED', 1);
+
+/**
+ * Shows this block if the associated PHP code returns TRUE.
+ */
+define('BLOCK_VISIBILITY_PHP', 2);
+
+/**
+ * Implements hook_help().
+ */
+function block_help($path, $arg) {
+ switch ($path) {
+ case 'admin/help#block':
+ $output = '';
+ $output .= '<h3>' . t('About') . '</h3>';
+ $output .= '<p>' . t('The Block module allows you to create boxes of content, which are rendered into an area, or region, of one or more pages of a website. The core Seven administration theme, for example, implements the regions "Content", "Help", "Dashboard main", and "Dashboard sidebar", and a block may appear in any one of these regions. The <a href="@blocks">Blocks administration page</a> provides a drag-and-drop interface for assigning a block to a region, and for controlling the order of blocks within regions. For more information, see the online handbook entry for <a href="@block">Block module</a>.', array('@block' => 'http://drupal.org/documentation/modules/block/', '@blocks' => url('admin/structure/block'))) . '</p>';
+ $output .= '<h3>' . t('Uses') . '</h3>';
+ $output .= '<dl>';
+ $output .= '<dt>' . t('Positioning content') . '</dt>';
+ $output .= '<dd>' . t('When working with blocks, remember that all themes do <em>not</em> implement the same regions, or display regions in the same way. Blocks are positioned on a per-theme basis. Users with the <em>Administer blocks</em> permission can disable blocks. Disabled blocks are listed on the <a href="@blocks">Blocks administration page</a>, but are not displayed in any region.', array('@block' => 'http://drupal.org/documentation/modules/block/', '@blocks' => url('admin/structure/block'))) . '</dd>';
+ $output .= '<dt>' . t('Controlling visibility') . '</dt>';
+ $output .= '<dd>' . t('Blocks can be configured to be visible only on certain pages, only to users of certain roles, or only on pages displaying certain <a href="@content-type">content types</a>. Administrators can also allow specific blocks to be enabled or disabled by users when they edit their <a href="@user">My account</a> page. Some dynamic blocks, such as those generated by modules, will be displayed only on certain pages.', array('@content-type' => url('admin/structure/types'), '@user' => url('user'))) . '</dd>';
+ $output .= '<dt>' . t('Creating custom blocks') . '</dt>';
+ $output .= '<dd>' . t('Users with the <em>Administer blocks</em> permission can <a href="@block-add">add custom blocks</a>, which are then listed on the <a href="@blocks">Blocks administration page</a>. Once created, custom blocks behave just like default and module-generated blocks.', array('@blocks' => url('admin/structure/block'), '@block-add' => url('admin/structure/block/add'))) . '</dd>';
+ $output .= '</dl>';
+ return $output;
+ case 'admin/structure/block/add':
+ return '<p>' . t('Use this page to create a new custom block.') . '</p>';
+ }
+ if ($arg[0] == 'admin' && $arg[1] == 'structure' && $arg['2'] == 'block' && (empty($arg[3]) || $arg[3] == 'list')) {
+ $demo_theme = !empty($arg[4]) ? $arg[4] : variable_get('theme_default', 'bartik');
+ $themes = list_themes();
+ $output = '<p>' . t('This page provides a drag-and-drop interface for assigning a block to a region, and for controlling the order of blocks within regions. Since not all themes implement the same regions, or display regions in the same way, blocks are positioned on a per-theme basis. Remember that your changes will not be saved until you click the <em>Save blocks</em> button at the bottom of the page. Click the <em>configure</em> link next to each block to configure its specific title and visibility settings.') . '</p>';
+ $output .= '<p>' . l(t('Demonstrate block regions (@theme)', array('@theme' => $themes[$demo_theme]->info['name'])), 'admin/structure/block/demo/' . $demo_theme) . '</p>';
+ return $output;
+ }
+}
+
+/**
+ * Implements hook_theme().
+ */
+function block_theme() {
+ return array(
+ 'block' => array(
+ 'render element' => 'elements',
+ 'template' => 'block',
+ ),
+ 'block_admin_display_form' => array(
+ 'template' => 'block-admin-display-form',
+ 'file' => 'block.admin.inc',
+ 'render element' => 'form',
+ ),
+ );
+}
+
+/**
+ * Implements hook_permission().
+ */
+function block_permission() {
+ return array(
+ 'administer blocks' => array(
+ 'title' => t('Administer blocks'),
+ ),
+ );
+}
+
+/**
+ * Implements hook_menu().
+ */
+function block_menu() {
+ $default_theme = variable_get('theme_default', 'bartik');
+ $items['admin/structure/block'] = array(
+ 'title' => 'Blocks',
+ 'description' => 'Configure what block content appears in your site\'s sidebars and other regions.',
+ 'page callback' => 'block_admin_display',
+ 'page arguments' => array($default_theme),
+ 'access arguments' => array('administer blocks'),
+ 'file' => 'block.admin.inc',
+ );
+ $items['admin/structure/block/manage/%/%'] = array(
+ 'title' => 'Configure block',
+ 'page callback' => 'drupal_get_form',
+ 'page arguments' => array('block_admin_configure', 4, 5),
+ 'access arguments' => array('administer blocks'),
+ 'file' => 'block.admin.inc',
+ );
+ $items['admin/structure/block/manage/%/%/configure'] = array(
+ 'title' => 'Configure block',
+ 'type' => MENU_DEFAULT_LOCAL_TASK,
+ 'context' => MENU_CONTEXT_INLINE,
+ );
+ $items['admin/structure/block/manage/%/%/delete'] = array(
+ 'title' => 'Delete block',
+ 'page callback' => 'drupal_get_form',
+ 'page arguments' => array('block_custom_block_delete', 4, 5),
+ 'access arguments' => array('administer blocks'),
+ 'type' => MENU_LOCAL_TASK,
+ 'context' => MENU_CONTEXT_NONE,
+ 'file' => 'block.admin.inc',
+ );
+ $items['admin/structure/block/add'] = array(
+ 'title' => 'Add block',
+ 'page callback' => 'drupal_get_form',
+ 'page arguments' => array('block_add_block_form'),
+ 'access arguments' => array('administer blocks'),
+ 'type' => MENU_LOCAL_ACTION,
+ 'file' => 'block.admin.inc',
+ );
+ foreach (list_themes() as $key => $theme) {
+ $items['admin/structure/block/list/' . $key] = array(
+ 'title' => check_plain($theme->info['name']),
+ 'page arguments' => array($key),
+ 'type' => $key == $default_theme ? MENU_DEFAULT_LOCAL_TASK : MENU_LOCAL_TASK,
+ 'weight' => $key == $default_theme ? -10 : 0,
+ 'access callback' => '_block_themes_access',
+ 'access arguments' => array($theme),
+ 'file' => 'block.admin.inc',
+ );
+ if ($key != $default_theme) {
+ $items['admin/structure/block/list/' . $key . '/add'] = array(
+ 'title' => 'Add block',
+ 'page callback' => 'drupal_get_form',
+ 'page arguments' => array('block_add_block_form'),
+ 'access arguments' => array('administer blocks'),
+ 'type' => MENU_LOCAL_ACTION,
+ 'file' => 'block.admin.inc',
+ );
+ }
+ $items['admin/structure/block/demo/' . $key] = array(
+ 'title' => check_plain($theme->info['name']),
+ 'page callback' => 'block_admin_demo',
+ 'page arguments' => array($key),
+ 'type' => MENU_CALLBACK,
+ 'access callback' => '_block_themes_access',
+ 'access arguments' => array($theme),
+ 'theme callback' => '_block_custom_theme',
+ 'theme arguments' => array($key),
+ 'file' => 'block.admin.inc',
+ );
+ }
+ return $items;
+}
+
+/**
+ * Menu item access callback - only admin or enabled themes can be accessed.
+ */
+function _block_themes_access($theme) {
+ return user_access('administer blocks') && drupal_theme_access($theme);
+}
+
+/**
+ * Theme callback for the block configuration pages.
+ *
+ * @param $theme
+ * The theme whose blocks are being configured. If not set, the default theme
+ * is assumed.
+ * @return
+ * The theme that should be used for the block configuration page, or NULL
+ * to indicate that the default theme should be used.
+ */
+function _block_custom_theme($theme = NULL) {
+ // We return exactly what was passed in, to guarantee that the page will
+ // always be displayed using the theme whose blocks are being configured.
+ return $theme;
+}
+
+/**
+ * Implements hook_block_info().
+ */
+function block_block_info() {
+ $blocks = array();
+
+ $result = db_query('SELECT bid, info FROM {block_custom} ORDER BY info');
+ foreach ($result as $block) {
+ $blocks[$block->bid]['info'] = $block->info;
+ // Not worth caching.
+ $blocks[$block->bid]['cache'] = DRUPAL_NO_CACHE;
+ }
+ return $blocks;
+}
+
+/**
+ * Implements hook_block_configure().
+ */
+function block_block_configure($delta = 0) {
+ if ($delta) {
+ $custom_block = block_custom_block_get($delta);
+ }
+ else {
+ $custom_block = array();
+ }
+ return block_custom_block_form($custom_block);
+}
+
+/**
+ * Implements hook_block_save().
+ */
+function block_block_save($delta = 0, $edit = array()) {
+ block_custom_block_save($edit, $delta);
+}
+
+/**
+ * Implements hook_block_view().
+ *
+ * Generates the administrator-defined blocks for display.
+ */
+function block_block_view($delta = '') {
+ $block = db_query('SELECT body, format FROM {block_custom} WHERE bid = :bid', array(':bid' => $delta))->fetchObject();
+ $data['subject'] = NULL;
+ $data['content'] = check_markup($block->body, $block->format, '', TRUE);
+ return $data;
+}
+
+/**
+ * Implements hook_page_build().
+ *
+ * Renders blocks into their regions.
+ */
+function block_page_build(&$page) {
+ global $theme;
+
+ // The theme system might not yet be initialized. We need $theme.
+ drupal_theme_initialize();
+
+ // Fetch a list of regions for the current theme.
+ $all_regions = system_region_list($theme);
+
+ $item = menu_get_item();
+ if ($item['path'] != 'admin/structure/block/demo/' . $theme) {
+ // Load all region content assigned via blocks.
+ foreach (array_keys($all_regions) as $region) {
+ // Assign blocks to region.
+ if ($blocks = block_get_blocks_by_region($region)) {
+ $page[$region] = $blocks;
+ }
+ }
+ // Once we've finished attaching all blocks to the page, clear the static
+ // cache to allow modules to alter the block list differently in different
+ // contexts. For example, any code that triggers hook_page_build() more
+ // than once in the same page request may need to alter the block list
+ // differently each time, so that only certain parts of the page are
+ // actually built. We do not clear the cache any earlier than this, though,
+ // because it is used each time block_get_blocks_by_region() gets called
+ // above.
+ drupal_static_reset('block_list');
+ }
+ else {
+ // Append region description if we are rendering the regions demo page.
+ $item = menu_get_item();
+ if ($item['path'] == 'admin/structure/block/demo/' . $theme) {
+ $visible_regions = array_keys(system_region_list($theme, REGIONS_VISIBLE));
+ foreach ($visible_regions as $region) {
+ $description = '<div class="block-region">' . $all_regions[$region] . '</div>';
+ $page[$region]['block_description'] = array(
+ '#markup' => $description,
+ '#weight' => 15,
+ );
+ }
+ $page['page_top']['backlink'] = array(
+ '#type' => 'link',
+ '#title' => t('Exit block region demonstration'),
+ '#href' => 'admin/structure/block' . (variable_get('theme_default', 'bartik') == $theme ? '' : '/list/' . $theme),
+ // Add the "overlay-restore" class to indicate this link should restore
+ // the context in which the region demonstration page was opened.
+ '#options' => array('attributes' => array('class' => array('block-demo-backlink', 'overlay-restore'))),
+ '#weight' => -10,
+ );
+ }
+ }
+}
+
+/**
+ * Gets a renderable array of a region containing all enabled blocks.
+ *
+ * @param $region
+ * The requested region.
+ *
+ * @return
+ * A renderable array of a region containing all enabled blocks.
+ */
+function block_get_blocks_by_region($region) {
+ $build = array();
+ if ($list = block_list($region)) {
+ $build = _block_get_renderable_array($list);
+ }
+ return $build;
+}
+
+/**
+ * Gets an array of blocks suitable for drupal_render().
+ *
+ * @param $list
+ * A list of blocks such as that returned by block_list().
+ *
+ * @return
+ * A renderable array.
+ */
+function _block_get_renderable_array($list = array()) {
+ $weight = 0;
+ $build = array();
+ foreach ($list as $key => $block) {
+ $build[$key] = $block->content;
+ unset($block->content);
+
+ // Add contextual links for this block; skip the main content block, since
+ // contextual links are basically output as tabs/local tasks already. Also
+ // skip the help block, since we assume that most users do not need or want
+ // to perform contextual actions on the help block, and the links needlessly
+ // draw attention on it.
+ if ($key != 'system_main' && $key != 'system_help') {
+ $build[$key]['#contextual_links']['block'] = array('admin/structure/block/manage', array($block->module, $block->delta));
+ }
+
+ $build[$key] += array(
+ '#block' => $block,
+ '#weight' => ++$weight,
+ );
+ $build[$key]['#theme_wrappers'][] ='block';
+ }
+ $build['#sorted'] = TRUE;
+ return $build;
+}
+
+/**
+ * Updates the 'block' DB table with the blocks currently exported by modules.
+ *
+ * @param $theme
+ * The theme to rehash blocks for. If not provided, defaults to the currently
+ * used theme.
+ *
+ * @return
+ * Blocks currently exported by modules.
+ */
+function _block_rehash($theme = NULL) {
+ global $theme_key;
+
+ drupal_theme_initialize();
+ if (!isset($theme)) {
+ // If theme is not specifically set, rehash for the current theme.
+ $theme = $theme_key;
+ }
+ $regions = system_region_list($theme);
+
+ // These are the blocks the function will return.
+ $blocks = array();
+ // These are the blocks defined by code and modified by the database.
+ $current_blocks = array();
+ // These are {block}.bid values to be kept.
+ $bids = array();
+ $or = db_or();
+ // Gather the blocks defined by modules.
+ foreach (module_implements('block_info') as $module) {
+ $module_blocks = module_invoke($module, 'block_info');
+ foreach ($module_blocks as $delta => $block) {
+ // Compile a condition to retrieve this block from the database.
+ $condition = db_and()
+ ->condition('module', $module)
+ ->condition('delta', $delta);
+ $or->condition($condition);
+ // Add identifiers.
+ $block['module'] = $module;
+ $block['delta'] = $delta;
+ $block['theme'] = $theme;
+ $current_blocks[$module][$delta] = $block;
+ }
+ }
+ // Save the blocks defined in code for alter context.
+ $code_blocks = $current_blocks;
+ $database_blocks = db_select('block', 'b', array('fetch' => PDO::FETCH_ASSOC))
+ ->fields('b')
+ ->condition($or)
+ ->condition('theme', $theme)
+ ->execute();
+ $original_database_blocks = array();
+ foreach ($database_blocks as $block) {
+ $module = $block['module'];
+ $delta = $block['delta'];
+ $original_database_blocks[$module][$delta] = $block;
+ // The cache mode can only by set from hook_block_info(), so that has
+ // precedence over the database's value.
+ if (isset($current_blocks[$module][$delta]['cache'])) {
+ $block['cache'] = $current_blocks[$module][$delta]['cache'];
+ }
+ // Preserve info which is not in the database.
+ $block['info'] = $current_blocks[$module][$delta]['info'];
+ // Blocks stored in the database override the blocks defined in code.
+ $current_blocks[$module][$delta] = $block;
+ // Preserve this block.
+ $bids[$block['bid']] = $block['bid'];
+ }
+ drupal_alter('block_info', $current_blocks, $theme, $code_blocks);
+ foreach ($current_blocks as $module => $module_blocks) {
+ foreach ($module_blocks as $delta => $block) {
+ if (!isset($block['pages'])) {
+ // {block}.pages is type 'text', so it cannot have a
+ // default value, and not null, so we need to provide
+ // value if the module did not.
+ $block['pages'] = '';
+ }
+ // Make sure weight is set.
+ if (!isset($block['weight'])) {
+ $block['weight'] = 0;
+ }
+ if (!empty($block['region']) && $block['region'] != BLOCK_REGION_NONE && !isset($regions[$block['region']]) && $block['status'] == 1) {
+ drupal_set_message(t('The block %info was assigned to the invalid region %region and has been disabled.', array('%info' => $block['info'], '%region' => $block['region'])), 'warning');
+ // Disabled modules are moved into the BLOCK_REGION_NONE later so no
+ // need to move the block to another region.
+ $block['status'] = 0;
+ }
+ // Set region to none if not enabled and make sure status is set.
+ if (empty($block['status'])) {
+ $block['status'] = 0;
+ $block['region'] = BLOCK_REGION_NONE;
+ }
+ // There is no point saving disabled blocks. Still, we need to save them
+ // because the 'title' attribute is saved to the {blocks} table.
+ if (isset($block['bid'])) {
+ // If the block has a bid property, it comes from the database and
+ // the record needs to be updated, so set the primary key to 'bid'
+ // before passing to drupal_write_record().
+ $primary_keys = array('bid');
+ // Remove a block from the list of blocks to keep if it became disabled.
+ unset($bids[$block['bid']]);
+ }
+ else {
+ $primary_keys = array();
+ }
+ // If the block is new or differs from the original database block, save
+ // it. To determine whether there was a change it is enough to examine
+ // the values for the keys in the original database record as that
+ // contained every database field.
+ if (!$primary_keys || array_diff_assoc($original_database_blocks[$module][$delta], $block)) {
+ drupal_write_record('block', $block, $primary_keys);
+ // Make it possible to test this.
+ $block['saved'] = TRUE;
+ }
+ // Add to the list of blocks we return.
+ $blocks[] = $block;
+ }
+ }
+ if ($bids) {
+ // Remove disabled that are no longer defined by the code from the
+ // database.
+ db_delete('block')
+ ->condition('bid', $bids, 'NOT IN')
+ ->condition('theme', $theme)
+ ->execute();
+ }
+ return $blocks;
+}
+
+/**
+ * Returns information from database about a user-created (custom) block.
+ *
+ * @param $bid
+ * ID of the block to get information for.
+ *
+ * @return
+ * Associative array of information stored in the database for this block.
+ * Array keys:
+ * - bid: Block ID.
+ * - info: Block description.
+ * - body: Block contents.
+ * - format: Filter ID of the filter format for the body.
+ */
+function block_custom_block_get($bid) {
+ return db_query("SELECT * FROM {block_custom} WHERE bid = :bid", array(':bid' => $bid))->fetchAssoc();
+}
+
+/**
+ * Form constructor for the custom block form.
+ *
+ * @param $edit
+ * (optional) An associative array of information retrieved by
+ * block_custom_get_block() if an existing block is being edited, or an empty
+ * array otherwise. Defaults to array().
+ *
+ * @ingroup forms
+ */
+function block_custom_block_form($edit = array()) {
+ $edit += array(
+ 'info' => '',
+ 'body' => '',
+ );
+ $form['info'] = array(
+ '#type' => 'textfield',
+ '#title' => t('Block description'),
+ '#default_value' => $edit['info'],
+ '#maxlength' => 64,
+ '#description' => t('A brief description of your block. Used on the <a href="@overview">Blocks administration page</a>.', array('@overview' => url('admin/structure/block'))),
+ '#required' => TRUE,
+ '#weight' => -18,
+ );
+ $form['body_field']['#weight'] = -17;
+ $form['body_field']['body'] = array(
+ '#type' => 'text_format',
+ '#title' => t('Block body'),
+ '#default_value' => $edit['body'],
+ '#format' => isset($edit['format']) ? $edit['format'] : NULL,
+ '#rows' => 15,
+ '#description' => t('The content of the block as shown to the user.'),
+ '#required' => TRUE,
+ '#weight' => -17,
+ );
+
+ return $form;
+}
+
+/**
+ * Saves a user-created block in the database.
+ *
+ * @param $edit
+ * Associative array of fields to save. Array keys:
+ * - info: Block description.
+ * - body: Associative array of body value and format. Array keys:
+ * - value: Block contents.
+ * - format: Filter ID of the filter format for the body.
+ * @param $delta
+ * Block ID of the block to save.
+ *
+ * @return
+ * Always returns TRUE.
+ */
+function block_custom_block_save($edit, $delta) {
+ db_update('block_custom')
+ ->fields(array(
+ 'body' => $edit['body']['value'],
+ 'info' => $edit['info'],
+ 'format' => $edit['body']['format'],
+ ))
+ ->condition('bid', $delta)
+ ->execute();
+ return TRUE;
+}
+
+/**
+ * Implements hook_form_FORM_ID_alter() for user_profile_form().
+ */
+function block_form_user_profile_form_alter(&$form, &$form_state) {
+ if ($form['#user_category'] == 'account') {
+ $account = $form['#user'];
+ $rids = array_keys($account->roles);
+ $result = db_query("SELECT DISTINCT b.* FROM {block} b LEFT JOIN {block_role} r ON b.module = r.module AND b.delta = r.delta WHERE b.status = 1 AND b.custom <> 0 AND (r.rid IN (:rids) OR r.rid IS NULL) ORDER BY b.weight, b.module", array(':rids' => $rids));
+
+ $blocks = array();
+ foreach ($result as $block) {
+ $data = module_invoke($block->module, 'block_info');
+ if ($data[$block->delta]['info']) {
+ $blocks[$block->module][$block->delta] = array(
+ '#type' => 'checkbox',
+ '#title' => check_plain($data[$block->delta]['info']),
+ '#default_value' => isset($account->data['block'][$block->module][$block->delta]) ? $account->data['block'][$block->module][$block->delta] : ($block->custom == 1),
+ );
+ }
+ }
+ // Only display the fieldset if there are any personalizable blocks.
+ if ($blocks) {
+ $form['block'] = array(
+ '#type' => 'fieldset',
+ '#title' => t('Personalize blocks'),
+ '#description' => t('Blocks consist of content or information that complements the main content of the page. Enable or disable optional blocks using the checkboxes below.'),
+ '#weight' => 3,
+ '#collapsible' => TRUE,
+ '#tree' => TRUE,
+ );
+ $form['block'] += $blocks;
+ }
+ }
+}
+
+/**
+ * Implements hook_user_presave().
+ */
+function block_user_presave(&$edit, $account, $category) {
+ if (isset($edit['block'])) {
+ $edit['data']['block'] = $edit['block'];
+ }
+}
+
+/**
+ * Initializes blocks for enabled themes.
+ *
+ * @param $theme_list
+ * An array of theme names.
+ */
+function block_themes_enabled($theme_list) {
+ foreach ($theme_list as $theme) {
+ block_theme_initialize($theme);
+ }
+}
+
+/**
+ * Assigns an initial, default set of blocks for a theme.
+ *
+ * This function is called the first time a new theme is enabled. The new theme
+ * gets a copy of the default theme's blocks, with the difference that if a
+ * particular region isn't available in the new theme, the block is assigned
+ * to the new theme's default region.
+ *
+ * @param $theme
+ * The name of a theme.
+ */
+function block_theme_initialize($theme) {
+ // Initialize theme's blocks if none already registered.
+ $has_blocks = (bool) db_query_range('SELECT 1 FROM {block} WHERE theme = :theme', 0, 1, array(':theme' => $theme))->fetchField();
+ if (!$has_blocks) {
+ $default_theme = variable_get('theme_default', 'bartik');
+ // Apply only to new theme's visible regions.
+ $regions = system_region_list($theme, REGIONS_VISIBLE);
+ $result = db_query("SELECT * FROM {block} WHERE theme = :theme", array(':theme' => $default_theme), array('fetch' => PDO::FETCH_ASSOC));
+ foreach ($result as $block) {
+ // If the region isn't supported by the theme, assign the block to the theme's default region.
+ if ($block['status'] && !isset($regions[$block['region']])) {
+ $block['region'] = system_default_region($theme);
+ }
+ $block['theme'] = $theme;
+ unset($block['bid']);
+ drupal_write_record('block', $block);
+ }
+ }
+}
+
+/**
+ * Returns all blocks in the specified region for the current user.
+ *
+ * @param $region
+ * The name of a region.
+ *
+ * @return
+ * An array of block objects, indexed with the module name and block delta
+ * concatenated with an underscore, thus: MODULE_DELTA. If you are displaying
+ * your blocks in one or two sidebars, you may check whether this array is
+ * empty to see how many columns are going to be displayed.
+ *
+ * @todo
+ * Now that the block table has a primary key, we should use that as the
+ * array key instead of MODULE_DELTA.
+ */
+function block_list($region) {
+ $blocks = &drupal_static(__FUNCTION__);
+
+ if (!isset($blocks)) {
+ $blocks = _block_load_blocks();
+ }
+
+ // Create an empty array if there are no entries.
+ if (!isset($blocks[$region])) {
+ $blocks[$region] = array();
+ }
+ else {
+ $blocks[$region] = _block_render_blocks($blocks[$region]);
+ }
+
+ return $blocks[$region];
+}
+
+/**
+ * Loads a block object from the database.
+ *
+ * @param $module
+ * Name of the module that implements the block to load.
+ * @param $delta
+ * Unique ID of the block within the context of $module. Pass NULL to return
+ * an empty block object for $module.
+ *
+ * @return
+ * A block object.
+ */
+function block_load($module, $delta) {
+ if (isset($delta)) {
+ $block = db_query('SELECT * FROM {block} WHERE module = :module AND delta = :delta', array(':module' => $module, ':delta' => $delta))->fetchObject();
+ }
+
+ // If the block does not exist in the database yet return a stub block
+ // object.
+ if (empty($block)) {
+ $block = new stdClass();
+ $block->module = $module;
+ $block->delta = $delta;
+ }
+
+ return $block;
+}
+
+/**
+ * Loads blocks' information from the database.
+ *
+ * @return
+ * An array of blocks grouped by region.
+ */
+function _block_load_blocks() {
+ global $theme_key;
+
+ $query = db_select('block', 'b');
+ $result = $query
+ ->fields('b')
+ ->condition('b.theme', $theme_key)
+ ->condition('b.status', 1)
+ ->orderBy('b.region')
+ ->orderBy('b.weight')
+ ->orderBy('b.module')
+ ->addTag('block_load')
+ ->addTag('translatable')
+ ->execute();
+
+ $block_info = $result->fetchAllAssoc('bid');
+ // Allow modules to modify the block list.
+ drupal_alter('block_list', $block_info);
+
+ $blocks = array();
+ foreach ($block_info as $block) {
+ $blocks[$block->region]["{$block->module}_{$block->delta}"] = $block;
+ }
+ return $blocks;
+}
+
+/**
+ * Implements hook_block_list_alter().
+ *
+ * Checks the page, user role, and user-specific visibility settings.
+ * Removes the block if the visibility conditions are not met.
+ */
+function block_block_list_alter(&$blocks) {
+ global $user, $theme_key;
+
+ // Build an array of roles for each block.
+ $block_roles = array();
+ $result = db_query('SELECT module, delta, rid FROM {block_role}');
+ foreach ($result as $record) {
+ $block_roles[$record->module][$record->delta][] = $record->rid;
+ }
+
+ foreach ($blocks as $key => $block) {
+ if (!isset($block->theme) || !isset($block->status) || $block->theme != $theme_key || $block->status != 1) {
+ // This block was added by a contrib module, leave it in the list.
+ continue;
+ }
+
+ // If a block has no roles associated, it is displayed for every role.
+ // For blocks with roles associated, if none of the user's roles matches
+ // the settings from this block, remove it from the block list.
+ if (isset($block_roles[$block->module][$block->delta]) && !array_intersect($block_roles[$block->module][$block->delta], array_keys($user->roles))) {
+ // No match.
+ unset($blocks[$key]);
+ continue;
+ }
+
+ // Use the user's block visibility setting, if necessary.
+ if ($block->custom != BLOCK_CUSTOM_FIXED) {
+ if ($user->uid && isset($user->data['block'][$block->module][$block->delta])) {
+ $enabled = $user->data['block'][$block->module][$block->delta];
+ }
+ else {
+ $enabled = ($block->custom == BLOCK_CUSTOM_ENABLED);
+ }
+ }
+ else {
+ $enabled = TRUE;
+ }
+
+ // Limited visibility blocks must list at least one page.
+ if ($block->visibility == BLOCK_VISIBILITY_LISTED && empty($block->pages)) {
+ $enabled = FALSE;
+ }
+
+ if (!$enabled) {
+ unset($blocks[$key]);
+ continue;
+ }
+
+ // Match path if necessary.
+ if ($block->pages) {
+ // Convert path to lowercase. This allows comparison of the same path
+ // with different case. Ex: /Page, /page, /PAGE.
+ $pages = drupal_strtolower($block->pages);
+ if ($block->visibility < BLOCK_VISIBILITY_PHP) {
+ // Convert the Drupal path to lowercase
+ $path = drupal_strtolower(drupal_get_path_alias($_GET['q']));
+ // Compare the lowercase internal and lowercase path alias (if any).
+ $page_match = drupal_match_path($path, $pages);
+ if ($path != $_GET['q']) {
+ $page_match = $page_match || drupal_match_path($_GET['q'], $pages);
+ }
+ // When $block->visibility has a value of 0 (BLOCK_VISIBILITY_NOTLISTED),
+ // the block is displayed on all pages except those listed in $block->pages.
+ // When set to 1 (BLOCK_VISIBILITY_LISTED), it is displayed only on those
+ // pages listed in $block->pages.
+ $page_match = !($block->visibility xor $page_match);
+ }
+ elseif (module_exists('php')) {
+ $page_match = php_eval($block->pages);
+ }
+ else {
+ $page_match = FALSE;
+ }
+ }
+ else {
+ $page_match = TRUE;
+ }
+ if (!$page_match) {
+ unset($blocks[$key]);
+ }
+ }
+}
+
+/**
+ * Render the content and subject for a set of blocks.
+ *
+ * @param $region_blocks
+ * An array of block objects such as returned for one region by _block_load_blocks().
+ *
+ * @return
+ * An array of visible blocks as expected by drupal_render().
+ */
+function _block_render_blocks($region_blocks) {
+ // Block caching is not compatible with node access modules. We also
+ // preserve the submission of forms in blocks, by fetching from cache only
+ // if the request method is 'GET' (or 'HEAD').
+ $cacheable = !count(module_implements('node_grants')) && ($_SERVER['REQUEST_METHOD'] == 'GET' || $_SERVER['REQUEST_METHOD'] == 'HEAD');
+
+ // Proceed to loop over all blocks in order to compute their respective cache
+ // identifiers; this allows us to do one single cache_get_multiple() call
+ // instead of doing one cache_get() call per block.
+ $cached_blocks = array();
+ $cids = array();
+
+ if ($cacheable) {
+ foreach ($region_blocks as $key => $block) {
+ if (!isset($block->content)) {
+ if (($cid = _block_get_cache_id($block))) {
+ $cids[$key] = $cid;
+ }
+ }
+ }
+
+ if ($cids) {
+ // We cannot pass $cids in directly because cache_get_multiple() will
+ // modify it, and we need to use it later on in this function.
+ $cid_values = array_values($cids);
+ $cached_blocks = cache_get_multiple($cid_values, 'cache_block');
+ }
+ }
+
+ foreach ($region_blocks as $key => $block) {
+ // Render the block content if it has not been created already.
+ if (!isset($block->content)) {
+ // Erase the block from the static array - we'll put it back if it has
+ // content.
+ unset($region_blocks[$key]);
+
+ $cid = empty($cids[$key]) ? NULL : $cids[$key];
+
+ // Try fetching the block from the previously loaded cache entries.
+ if (isset($cached_blocks[$cid])) {
+ $array = $cached_blocks[$cid]->data;
+ }
+ else {
+ $array = module_invoke($block->module, 'block_view', $block->delta);
+
+ // Valid PHP function names cannot contain hyphens.
+ $delta = str_replace('-', '_', $block->delta);
+ // Allow modules to modify the block before it is viewed, via either
+ // hook_block_view_alter() or hook_block_view_MODULE_DELTA_alter().
+ drupal_alter(array('block_view', "block_view_{$block->module}_{$delta}"), $array, $block);
+
+ if (isset($cid)) {
+ cache_set($cid, $array, 'cache_block', CACHE_TEMPORARY);
+ }
+ }
+
+ if (isset($array) && is_array($array)) {
+ foreach ($array as $k => $v) {
+ $block->$k = $v;
+ }
+ }
+ if (isset($block->content) && $block->content) {
+ // Normalize to the drupal_render() structure.
+ if (is_string($block->content)) {
+ $block->content = array('#markup' => $block->content);
+ }
+ // Override default block title if a custom display title is present.
+ if ($block->title) {
+ // Check plain here to allow module generated titles to keep any
+ // markup.
+ $block->subject = $block->title == '<none>' ? '' : check_plain($block->title);
+ }
+ if (!isset($block->subject)) {
+ $block->subject = '';
+ }
+ $region_blocks["{$block->module}_{$block->delta}"] = $block;
+ }
+ }
+ }
+ return $region_blocks;
+}
+
+/**
+ * Assemble the cache_id to use for a given block.
+ *
+ * The cache_id string reflects the viewing context for the current block
+ * instance, obtained by concatenating the relevant context information
+ * (user, page, ...) according to the block's cache settings (BLOCK_CACHE_*
+ * constants). Two block instances can use the same cached content when
+ * they share the same cache_id.
+ *
+ * Theme and language contexts are automatically differentiated.
+ *
+ * @param $block
+ * @return
+ * The string used as cache_id for the block.
+ */
+function _block_get_cache_id($block) {
+ global $user;
+
+ // User 1 being out of the regular 'roles define permissions' schema,
+ // it brings too many chances of having unwanted output get in the cache
+ // and later be served to other users. We therefore exclude user 1 from
+ // block caching.
+ if (variable_get('block_cache', FALSE) && !in_array($block->cache, array(DRUPAL_NO_CACHE, DRUPAL_CACHE_CUSTOM)) && $user->uid != 1) {
+ // Start with common sub-patterns: block identification, theme, language.
+ $cid_parts[] = $block->module;
+ $cid_parts[] = $block->delta;
+ $cid_parts = array_merge($cid_parts, drupal_render_cid_parts($block->cache));
+
+ return implode(':', $cid_parts);
+ }
+}
+
+/**
+ * Implements hook_flush_caches().
+ */
+function block_flush_caches() {
+ // Rehash blocks for active themes. We don't use list_themes() here,
+ // because if MAINTENANCE_MODE is defined it skips reading the database,
+ // and we can't tell which themes are active.
+ $themes = db_query("SELECT name FROM {system} WHERE type = 'theme' AND status = 1");
+ foreach ($themes as $theme) {
+ _block_rehash($theme->name);
+ }
+
+ return array('cache_block');
+}
+
+/**
+ * Processes variables for block.tpl.php.
+ *
+ * Prepares the values passed to the theme_block function to be passed
+ * into a pluggable template engine. Uses block properties to generate a
+ * series of template file suggestions. If none are found, the default
+ * block.tpl.php is used.
+ *
+ * Most themes utilize their own copy of block.tpl.php. The default is located
+ * inside "modules/block/block.tpl.php". Look in there for the full list of
+ * variables.
+ *
+ * The $variables array contains the following arguments:
+ * - $block
+ *
+ * @see block.tpl.php
+ */
+function template_preprocess_block(&$variables) {
+ $block_counter = &drupal_static(__FUNCTION__, array());
+ $variables['block'] = $variables['elements']['#block'];
+ // All blocks get an independent counter for each region.
+ if (!isset($block_counter[$variables['block']->region])) {
+ $block_counter[$variables['block']->region] = 1;
+ }
+ // Same with zebra striping.
+ $variables['block_zebra'] = ($block_counter[$variables['block']->region] % 2) ? 'odd' : 'even';
+ $variables['block_id'] = $block_counter[$variables['block']->region]++;
+
+ // Create the $content variable that templates expect.
+ $variables['content'] = $variables['elements']['#children'];
+
+ $variables['classes_array'][] = drupal_html_class('block-' . $variables['block']->module);
+
+ $variables['theme_hook_suggestions'][] = 'block__' . $variables['block']->region;
+ $variables['theme_hook_suggestions'][] = 'block__' . $variables['block']->module;
+ // Hyphens (-) and underscores (_) play a special role in theme suggestions.
+ // Theme suggestions should only contain underscores, because within
+ // drupal_find_theme_templates(), underscores are converted to hyphens to
+ // match template file names, and then converted back to underscores to match
+ // pre-processing and other function names. So if your theme suggestion
+ // contains a hyphen, it will end up as an underscore after this conversion,
+ // and your function names won't be recognized. So, we need to convert
+ // hyphens to underscores in block deltas for the theme suggestions.
+ $variables['theme_hook_suggestions'][] = 'block__' . $variables['block']->module . '__' . strtr($variables['block']->delta, '-', '_');
+
+ // Create a valid HTML ID and make sure it is unique.
+ $variables['block_html_id'] = drupal_html_id('block-' . $variables['block']->module . '-' . $variables['block']->delta);
+}
+
+/**
+ * Implements hook_user_role_delete().
+ *
+ * Removes deleted role from blocks that use it.
+ */
+function block_user_role_delete($role) {
+ db_delete('block_role')
+ ->condition('rid', $role->rid)
+ ->execute();
+}
+
+/**
+ * Implements hook_menu_delete().
+ */
+function block_menu_delete($menu) {
+ db_delete('block')
+ ->condition('module', 'menu')
+ ->condition('delta', $menu['menu_name'])
+ ->execute();
+ db_delete('block_role')
+ ->condition('module', 'menu')
+ ->condition('delta', $menu['menu_name'])
+ ->execute();
+}
+
+/**
+ * Implements hook_form_FORM_ID_alter().
+ */
+function block_form_system_performance_settings_alter(&$form, &$form_state) {
+ $disabled = count(module_implements('node_grants'));
+ $form['caching']['block_cache'] = array(
+ '#type' => 'checkbox',
+ '#title' => t('Cache blocks'),
+ '#default_value' => variable_get('block_cache', FALSE),
+ '#disabled' => $disabled,
+ '#description' => $disabled ? t('Block caching is inactive because you have enabled modules defining content access restrictions.') : NULL,
+ '#weight' => -1,
+ );
+}
+
+/**
+ * Implements hook_admin_paths().
+ */
+function block_admin_paths() {
+ $paths = array(
+ // Exclude the block demonstration page from admin (overlay) treatment.
+ // This allows us to present this page in its true form, full page.
+ 'admin/structure/block/demo/*' => FALSE,
+ );
+ return $paths;
+}
+
+/**
+ * Implements hook_modules_uninstalled().
+ *
+ * Cleans up {block} and {block_role} tables from modules' blocks.
+ */
+function block_modules_uninstalled($modules) {
+ db_delete('block')
+ ->condition('module', $modules, 'IN')
+ ->execute();
+ db_delete('block_role')
+ ->condition('module', $modules, 'IN')
+ ->execute();
+}