taxonomy.admin.inc

<?php


/**
 * @file
 * Administrative page callbacks for the taxonomy module.
 */

/**
 * Form builder to list and manage vocabularies.
 *
 * @ingroup forms
 * @see taxonomy_overview_vocabularies_submit()
 * @see theme_taxonomy_overview_vocabularies()
 */
function taxonomy_overview_vocabularies($form) {
    $vocabularies = taxonomy_get_vocabularies();
    $form['#tree'] = TRUE;
    foreach ($vocabularies as $vocabulary) {
        $form[$vocabulary->vid]['#vocabulary'] = $vocabulary;
        $form[$vocabulary->vid]['name'] = array(
            '#markup' => check_plain($vocabulary->name),
        );
        $form[$vocabulary->vid]['weight'] = array(
            '#type' => 'weight',
            '#title' => t('Weight for @title', array(
                '@title' => $vocabulary->name,
            )),
            '#title_display' => 'invisible',
            '#delta' => 10,
            '#default_value' => $vocabulary->weight,
        );
        $form[$vocabulary->vid]['edit'] = array(
            '#type' => 'link',
            '#title' => t('edit vocabulary'),
            '#href' => "admin/structure/taxonomy/{$vocabulary->machine_name}/edit",
        );
        $form[$vocabulary->vid]['list'] = array(
            '#type' => 'link',
            '#title' => t('list terms'),
            '#href' => "admin/structure/taxonomy/{$vocabulary->machine_name}",
        );
        $form[$vocabulary->vid]['add'] = array(
            '#type' => 'link',
            '#title' => t('add terms'),
            '#href' => "admin/structure/taxonomy/{$vocabulary->machine_name}/add",
        );
    }
    // Only make this form include a submit button and weight if more than one
    // vocabulary exists.
    if (count($vocabularies) > 1) {
        $form['actions'] = array(
            '#type' => 'actions',
        );
        $form['actions']['submit'] = array(
            '#type' => 'submit',
            '#value' => t('Save'),
        );
    }
    elseif (isset($vocabulary)) {
        unset($form[$vocabulary->vid]['weight']);
    }
    return $form;
}

/**
 * Submit handler for vocabularies overview. Updates changed vocabulary weights.
 *
 * @see taxonomy_overview_vocabularies()
 */
function taxonomy_overview_vocabularies_submit($form, &$form_state) {
    foreach ($form_state['values'] as $vid => $vocabulary) {
        if (is_numeric($vid) && $form[$vid]['#vocabulary']->weight != $form_state['values'][$vid]['weight']) {
            $form[$vid]['#vocabulary']->weight = $form_state['values'][$vid]['weight'];
            taxonomy_vocabulary_save($form[$vid]['#vocabulary']);
        }
    }
    drupal_set_message(t('The configuration options have been saved.'));
}

/**
 * Returns HTML for the vocabulary overview form as a sortable list of vocabularies.
 *
 * @param $variables
 *   An associative array containing:
 *   - form: A render element representing the form.
 *
 * @see taxonomy_overview_vocabularies()
 * @ingroup themeable
 */
function theme_taxonomy_overview_vocabularies($variables) {
    $form = $variables['form'];
    $rows = array();
    foreach (element_children($form) as $key) {
        if (isset($form[$key]['name'])) {
            $vocabulary =& $form[$key];
            $row = array();
            $row[] = drupal_render($vocabulary['name']);
            if (isset($vocabulary['weight'])) {
                $vocabulary['weight']['#attributes']['class'] = array(
                    'vocabulary-weight',
                );
                $row[] = drupal_render($vocabulary['weight']);
            }
            $row[] = drupal_render($vocabulary['edit']);
            $row[] = drupal_render($vocabulary['list']);
            $row[] = drupal_render($vocabulary['add']);
            $rows[] = array(
                'data' => $row,
                'class' => array(
                    'draggable',
                ),
            );
        }
    }
    $header = array(
        t('Vocabulary name'),
    );
    if (isset($form['actions'])) {
        $header[] = t('Weight');
        drupal_add_tabledrag('taxonomy', 'order', 'sibling', 'vocabulary-weight');
    }
    $header[] = array(
        'data' => t('Operations'),
        'colspan' => '3',
    );
    return theme('table', array(
        'header' => $header,
        'rows' => $rows,
        'empty' => t('No vocabularies available. <a href="@link">Add vocabulary</a>.', array(
            '@link' => url('admin/structure/taxonomy/add'),
        )),
        'attributes' => array(
            'id' => 'taxonomy',
        ),
    )) . drupal_render_children($form);
}

/**
 * Form builder for the vocabulary editing form.
 *
 * @ingroup forms
 * @see taxonomy_form_vocabulary_submit()
 * @see taxonomy_form_vocabulary_validate()
 */
function taxonomy_form_vocabulary($form, &$form_state, $edit = array()) {
    // During initial form build, add the entity to the form state for use
    // during form building and processing. During a rebuild, use what is in the
    // form state.
    if (!isset($form_state['vocabulary'])) {
        $vocabulary = is_object($edit) ? $edit : (object) $edit;
        $defaults = array(
            'name' => '',
            'machine_name' => '',
            'description' => '',
            'hierarchy' => 0,
            'weight' => 0,
        );
        foreach ($defaults as $key => $value) {
            if (!isset($vocabulary->{$key})) {
                $vocabulary->{$key} = $value;
            }
        }
        $form_state['vocabulary'] = $vocabulary;
    }
    else {
        $vocabulary = $form_state['vocabulary'];
    }
    // @todo Legacy support. Modules are encouraged to access the entity using
    //   $form_state. Remove in Drupal 8.
    $form['#vocabulary'] = $form_state['vocabulary'];
    // Check whether we need a deletion confirmation form.
    if (isset($form_state['confirm_delete']) && isset($form_state['values']['vid'])) {
        return taxonomy_vocabulary_confirm_delete($form, $form_state, $form_state['values']['vid']);
    }
    $form['name'] = array(
        '#type' => 'textfield',
        '#title' => t('Name'),
        '#default_value' => $vocabulary->name,
        '#maxlength' => 255,
        '#required' => TRUE,
    );
    $form['machine_name'] = array(
        '#type' => 'machine_name',
        '#default_value' => $vocabulary->machine_name,
        '#maxlength' => 255,
        '#machine_name' => array(
            'exists' => 'taxonomy_vocabulary_machine_name_load',
        ),
    );
    $form['old_machine_name'] = array(
        '#type' => 'value',
        '#value' => $vocabulary->machine_name,
    );
    $form['description'] = array(
        '#type' => 'textfield',
        '#title' => t('Description'),
        '#default_value' => $vocabulary->description,
    );
    // Set the hierarchy to "multiple parents" by default. This simplifies the
    // vocabulary form and standardizes the term form.
    $form['hierarchy'] = array(
        '#type' => 'value',
        '#value' => '0',
    );
    $form['actions'] = array(
        '#type' => 'actions',
    );
    $form['actions']['submit'] = array(
        '#type' => 'submit',
        '#value' => t('Save'),
    );
    if (isset($vocabulary->vid)) {
        $form['actions']['delete'] = array(
            '#type' => 'submit',
            '#value' => t('Delete'),
        );
        $form['vid'] = array(
            '#type' => 'value',
            '#value' => $vocabulary->vid,
        );
        $form['module'] = array(
            '#type' => 'value',
            '#value' => $vocabulary->module,
        );
    }
    $form['#validate'][] = 'taxonomy_form_vocabulary_validate';
    return $form;
}

/**
 * Form validation handler for taxonomy_form_vocabulary().
 *
 * Makes sure that the machine name of the vocabulary is not in the
 * disallowed list (names that conflict with menu items, such as 'list'
 * and 'add').
 *
 * @see taxonomy_form_vocabulary()
 * @see taxonomy_form_vocabulary_submit()
 */
function taxonomy_form_vocabulary_validate($form, &$form_state) {
    // During the deletion there is no 'machine_name' key
    if (isset($form_state['values']['machine_name'])) {
        // Do not allow machine names to conflict with taxonomy path arguments.
        $machine_name = $form_state['values']['machine_name'];
        $disallowed = array(
            'add',
            'list',
        );
        if (in_array($machine_name, $disallowed)) {
            form_set_error('machine_name', t('The machine-readable name cannot be "add" or "list".'));
        }
    }
}

/**
 * Form submission handler for taxonomy_form_vocabulary().
 *
 * @see taxonomy_form_vocabulary()
 * @see taxonomy_form_vocabulary_validate()
 */
function taxonomy_form_vocabulary_submit($form, &$form_state) {
    if ($form_state['triggering_element']['#value'] == t('Delete')) {
        // Rebuild the form to confirm vocabulary deletion.
        $form_state['rebuild'] = TRUE;
        $form_state['confirm_delete'] = TRUE;
        return;
    }
    $vocabulary = $form_state['vocabulary'];
    entity_form_submit_build_entity('taxonomy_vocabulary', $vocabulary, $form, $form_state);
    switch (taxonomy_vocabulary_save($vocabulary)) {
        case SAVED_NEW:
            drupal_set_message(t('Created new vocabulary %name.', array(
                '%name' => $vocabulary->name,
            )));
            watchdog('taxonomy', 'Created new vocabulary %name.', array(
                '%name' => $vocabulary->name,
            ), WATCHDOG_NOTICE, l(t('edit'), 'admin/structure/taxonomy/' . $vocabulary->machine_name . '/edit'));
            break;
        case SAVED_UPDATED:
            drupal_set_message(t('Updated vocabulary %name.', array(
                '%name' => $vocabulary->name,
            )));
            watchdog('taxonomy', 'Updated vocabulary %name.', array(
                '%name' => $vocabulary->name,
            ), WATCHDOG_NOTICE, l(t('edit'), 'admin/structure/taxonomy/' . $vocabulary->machine_name . '/edit'));
            break;
    }
    $form_state['values']['vid'] = $vocabulary->vid;
    $form_state['vid'] = $vocabulary->vid;
    $form_state['redirect'] = 'admin/structure/taxonomy';
}

/**
 * Form builder for the taxonomy terms overview.
 *
 * Display a tree of all the terms in a vocabulary, with options to edit
 * each one. The form is made drag and drop by the theme function.
 *
 * @ingroup forms
 * @see taxonomy_overview_terms_submit()
 * @see theme_taxonomy_overview_terms()
 */
function taxonomy_overview_terms($form, &$form_state, $vocabulary) {
    global $pager_page_array, $pager_total, $pager_total_items;
    // Check for confirmation forms.
    if (isset($form_state['confirm_reset_alphabetical'])) {
        return taxonomy_vocabulary_confirm_reset_alphabetical($form, $form_state, $vocabulary->vid);
    }
    $form['#vocabulary'] = $vocabulary;
    $form['#tree'] = TRUE;
    $form['#parent_fields'] = FALSE;
    $page = isset($_GET['page']) ? $_GET['page'] : 0;
    $page_increment = variable_get('taxonomy_terms_per_page_admin', 100);
    // Number of terms per page.
    $page_entries = 0;
    // Elements shown on this page.
    $before_entries = 0;
    // Elements at the root level before this page.
    $after_entries = 0;
    // Elements at the root level after this page.
    $root_entries = 0;
    // Elements at the root level on this page.
    // Terms from previous and next pages are shown if the term tree would have
    // been cut in the middle. Keep track of how many extra terms we show on each
    // page of terms.
    $back_step = NULL;
    $forward_step = 0;
    // An array of the terms to be displayed on this page.
    $current_page = array();
    $delta = 0;
    $term_deltas = array();
    $tree = taxonomy_get_tree($vocabulary->vid);
    $term = current($tree);
    do {
        // In case this tree is completely empty.
        if (empty($term)) {
            break;
        }
        $delta++;
        // Count entries before the current page.
        if ($page && $page * $page_increment > $before_entries && !isset($back_step)) {
            $before_entries++;
            continue;
        }
        elseif ($page_entries > $page_increment && isset($complete_tree)) {
            $after_entries++;
            continue;
        }
        // Do not let a term start the page that is not at the root.
        if (isset($term->depth) && $term->depth > 0 && !isset($back_step)) {
            $back_step = 0;
            while ($pterm = prev($tree)) {
                $before_entries--;
                $back_step++;
                if ($pterm->depth == 0) {
                    prev($tree);
                    continue 2;
                    // Jump back to the start of the root level parent.
                }
            }
        }
        $back_step = isset($back_step) ? $back_step : 0;
        // Continue rendering the tree until we reach the a new root item.
        if ($page_entries >= $page_increment + $back_step + 1 && $term->depth == 0 && $root_entries > 1) {
            $complete_tree = TRUE;
            // This new item at the root level is the first item on the next page.
            $after_entries++;
            continue;
        }
        if ($page_entries >= $page_increment + $back_step) {
            $forward_step++;
        }
        // Finally, if we've gotten down this far, we're rendering a term on this page.
        $page_entries++;
        $term_deltas[$term->tid] = isset($term_deltas[$term->tid]) ? $term_deltas[$term->tid] + 1 : 0;
        $key = 'tid:' . $term->tid . ':' . $term_deltas[$term->tid];
        // Keep track of the first term displayed on this page.
        if ($page_entries == 1) {
            $form['#first_tid'] = $term->tid;
        }
        // Keep a variable to make sure at least 2 root elements are displayed.
        if ($term->parents[0] == 0) {
            $root_entries++;
        }
        $current_page[$key] = $term;
    } while ($term = next($tree));
    // Because we didn't use a pager query, set the necessary pager variables.
    $total_entries = $before_entries + $page_entries + $after_entries;
    $pager_total_items[0] = $total_entries;
    $pager_page_array[0] = $page;
    $pager_total[0] = ceil($total_entries / $page_increment);
    // If this form was already submitted once, it's probably hit a validation
    // error. Ensure the form is rebuilt in the same order as the user submitted.
    if (!empty($form_state['input'])) {
        $order = array_flip(array_keys($form_state['input']));
        // Get the $_POST order.
        $current_page = array_merge($order, $current_page);
        // Update our form with the new order.
        foreach ($current_page as $key => $term) {
            // Verify this is a term for the current page and set at the current depth.
            if (isset($form_state['input'][$key]) && is_array($form_state['input'][$key]) && is_numeric($form_state['input'][$key]['tid'])) {
                $current_page[$key]->depth = $form_state['input'][$key]['depth'];
            }
            else {
                unset($current_page[$key]);
            }
        }
    }
    // Build the actual form.
    foreach ($current_page as $key => $term) {
        // Save the term for the current page so we don't have to load it a second time.
        $form[$key]['#term'] = (array) $term;
        if (isset($term->parents)) {
            $form[$key]['#term']['parent'] = $term->parent = $term->parents[0];
            unset($form[$key]['#term']['parents'], $term->parents);
        }
        $form[$key]['view'] = array(
            '#type' => 'link',
            '#title' => $term->name,
            '#href' => "taxonomy/term/{$term->tid}",
        );
        if ($vocabulary->hierarchy < 2 && count($tree) > 1) {
            $form['#parent_fields'] = TRUE;
            $form[$key]['tid'] = array(
                '#type' => 'hidden',
                '#value' => $term->tid,
            );
            $form[$key]['parent'] = array(
                '#type' => 'hidden',
                // Yes, default_value on a hidden. It needs to be changeable by the javascript.
'#default_value' => $term->parent,
            );
            $form[$key]['depth'] = array(
                '#type' => 'hidden',
                // Same as above, the depth is modified by javascript, so it's a default_value.
'#default_value' => $term->depth,
            );
            $form[$key]['weight'] = array(
                '#type' => 'weight',
                '#delta' => $delta,
                '#title_display' => 'invisible',
                '#title' => t('Weight for added term'),
                '#default_value' => $term->weight,
            );
        }
        $form[$key]['edit'] = array(
            '#type' => 'link',
            '#title' => t('edit'),
            '#href' => 'taxonomy/term/' . $term->tid . '/edit',
            '#options' => array(
                'query' => drupal_get_destination(),
            ),
        );
    }
    $form['#total_entries'] = $total_entries;
    $form['#page_increment'] = $page_increment;
    $form['#page_entries'] = $page_entries;
    $form['#back_step'] = $back_step;
    $form['#forward_step'] = $forward_step;
    $form['#empty_text'] = t('No terms available. <a href="@link">Add term</a>.', array(
        '@link' => url('admin/structure/taxonomy/' . $vocabulary->machine_name . '/add'),
    ));
    if ($vocabulary->hierarchy < 2 && count($tree) > 1) {
        $form['actions'] = array(
            '#type' => 'actions',
            '#tree' => FALSE,
        );
        $form['actions']['submit'] = array(
            '#type' => 'submit',
            '#value' => t('Save'),
        );
        $form['actions']['reset_alphabetical'] = array(
            '#type' => 'submit',
            '#value' => t('Reset to alphabetical'),
        );
        $form_state['redirect'] = array(
            $_GET['q'],
            isset($_GET['page']) ? array(
                'query' => array(
                    'page' => $_GET['page'],
                ),
            ) : array(),
        );
    }
    return $form;
}

/**
 * Submit handler for terms overview form.
 *
 * Rather than using a textfield or weight field, this form depends entirely
 * upon the order of form elements on the page to determine new weights.
 *
 * Because there might be hundreds or thousands of taxonomy terms that need to
 * be ordered, terms are weighted from 0 to the number of terms in the
 * vocabulary, rather than the standard -10 to 10 scale. Numbers are sorted
 * lowest to highest, but are not necessarily sequential. Numbers may be skipped
 * when a term has children so that reordering is minimal when a child is
 * added or removed from a term.
 *
 * @see taxonomy_overview_terms()
 */
function taxonomy_overview_terms_submit($form, &$form_state) {
    if ($form_state['triggering_element']['#value'] == t('Reset to alphabetical')) {
        // Execute the reset action.
        if ($form_state['values']['reset_alphabetical'] === TRUE) {
            return taxonomy_vocabulary_confirm_reset_alphabetical_submit($form, $form_state);
        }
        // Rebuild the form to confirm the reset action.
        $form_state['rebuild'] = TRUE;
        $form_state['confirm_reset_alphabetical'] = TRUE;
        return;
    }
    // Sort term order based on weight.
    uasort($form_state['values'], 'drupal_sort_weight');
    $vocabulary = $form['#vocabulary'];
    $hierarchy = 0;
    // Update the current hierarchy type as we go.
    $changed_terms = array();
    $tree = taxonomy_get_tree($vocabulary->vid);
    if (empty($tree)) {
        return;
    }
    // Build a list of all terms that need to be updated on previous pages.
    $weight = 0;
    $term = (array) $tree[0];
    while ($term['tid'] != $form['#first_tid']) {
        if ($term['parents'][0] == 0 && $term['weight'] != $weight) {
            $term['parent'] = $term['parents'][0];
            $term['weight'] = $weight;
            $changed_terms[$term['tid']] = $term;
        }
        $weight++;
        $hierarchy = $term['parents'][0] != 0 ? 1 : $hierarchy;
        $term = (array) $tree[$weight];
    }
    // Renumber the current page weights and assign any new parents.
    $level_weights = array();
    foreach ($form_state['values'] as $tid => $values) {
        if (isset($form[$tid]['#term'])) {
            $term = $form[$tid]['#term'];
            // Give terms at the root level a weight in sequence with terms on previous pages.
            if ($values['parent'] == 0 && $term['weight'] != $weight) {
                $term['weight'] = $weight;
                $changed_terms[$term['tid']] = $term;
            }
            elseif ($values['parent'] > 0) {
                $level_weights[$values['parent']] = isset($level_weights[$values['parent']]) ? $level_weights[$values['parent']] + 1 : 0;
                if ($level_weights[$values['parent']] != $term['weight']) {
                    $term['weight'] = $level_weights[$values['parent']];
                    $changed_terms[$term['tid']] = $term;
                }
            }
            // Update any changed parents.
            if ($values['parent'] != $term['parent']) {
                $term['parent'] = $values['parent'];
                $changed_terms[$term['tid']] = $term;
            }
            $hierarchy = $term['parent'] != 0 ? 1 : $hierarchy;
            $weight++;
        }
    }
    // Build a list of all terms that need to be updated on following pages.
    for ($weight; $weight < count($tree); $weight++) {
        $term = (array) $tree[$weight];
        if ($term['parents'][0] == 0 && $term['weight'] != $weight) {
            $term['parent'] = $term['parents'][0];
            $term['weight'] = $weight;
            $changed_terms[$term['tid']] = $term;
        }
        $hierarchy = $term['parents'][0] != 0 ? 1 : $hierarchy;
    }
    // Save all updated terms.
    foreach ($changed_terms as $changed) {
        $term = (object) $changed;
        // Update term_hierachy and term_data directly since we don't have a
        // fully populated term object to save.
        db_update('taxonomy_term_hierarchy')->fields(array(
            'parent' => $term->parent,
        ))
            ->condition('tid', $term->tid, '=')
            ->execute();
        db_update('taxonomy_term_data')->fields(array(
            'weight' => $term->weight,
        ))
            ->condition('tid', $term->tid, '=')
            ->execute();
    }
    // Update the vocabulary hierarchy to flat or single hierarchy.
    if ($vocabulary->hierarchy != $hierarchy) {
        $vocabulary->hierarchy = $hierarchy;
        taxonomy_vocabulary_save($vocabulary);
    }
    drupal_set_message(t('The configuration options have been saved.'));
}

/**
 * Returns HTML for a terms overview form as a sortable list of terms.
 *
 * @param $variables
 *   An associative array containing:
 *   - form: A render element representing the form.
 *
 * @see taxonomy_overview_terms()
 * @ingroup themeable
 */
function theme_taxonomy_overview_terms($variables) {
    $form = $variables['form'];
    $page_increment = $form['#page_increment'];
    $page_entries = $form['#page_entries'];
    $back_step = $form['#back_step'];
    $forward_step = $form['#forward_step'];
    // Add drag and drop if parent fields are present in the form.
    if ($form['#parent_fields']) {
        drupal_add_tabledrag('taxonomy', 'match', 'parent', 'term-parent', 'term-parent', 'term-id', FALSE);
        drupal_add_tabledrag('taxonomy', 'depth', 'group', 'term-depth', NULL, NULL, FALSE);
        drupal_add_js(drupal_get_path('module', 'taxonomy') . '/taxonomy.js');
        drupal_add_js(array(
            'taxonomy' => array(
                'backStep' => $back_step,
                'forwardStep' => $forward_step,
            ),
        ), 'setting');
        drupal_add_css(drupal_get_path('module', 'taxonomy') . '/taxonomy.css');
    }
    drupal_add_tabledrag('taxonomy', 'order', 'sibling', 'term-weight');
    $errors = form_get_errors() != FALSE ? form_get_errors() : array();
    $rows = array();
    foreach (element_children($form) as $key) {
        if (isset($form[$key]['#term'])) {
            $term =& $form[$key];
            $row = array();
            $row[] = (isset($term['#term']['depth']) && $term['#term']['depth'] > 0 ? theme('indentation', array(
                'size' => $term['#term']['depth'],
            )) : '') . drupal_render($term['view']);
            if ($form['#parent_fields']) {
                $term['tid']['#attributes']['class'] = array(
                    'term-id',
                );
                $term['parent']['#attributes']['class'] = array(
                    'term-parent',
                );
                $term['depth']['#attributes']['class'] = array(
                    'term-depth',
                );
                $row[0] .= drupal_render($term['parent']) . drupal_render($term['tid']) . drupal_render($term['depth']);
            }
            $term['weight']['#attributes']['class'] = array(
                'term-weight',
            );
            $row[] = drupal_render($term['weight']);
            $row[] = drupal_render($term['edit']);
            $row = array(
                'data' => $row,
            );
            $rows[$key] = $row;
        }
    }
    // Add necessary classes to rows.
    $row_position = 0;
    foreach ($rows as $key => $row) {
        $rows[$key]['class'] = array();
        if (isset($form['#parent_fields'])) {
            $rows[$key]['class'][] = 'draggable';
        }
        // Add classes that mark which terms belong to previous and next pages.
        if ($row_position < $back_step || $row_position >= $page_entries - $forward_step) {
            $rows[$key]['class'][] = 'taxonomy-term-preview';
        }
        if ($row_position !== 0 && $row_position !== count($rows) - 1) {
            if ($row_position == $back_step - 1 || $row_position == $page_entries - $forward_step - 1) {
                $rows[$key]['class'][] = 'taxonomy-term-divider-top';
            }
            elseif ($row_position == $back_step || $row_position == $page_entries - $forward_step) {
                $rows[$key]['class'][] = 'taxonomy-term-divider-bottom';
            }
        }
        // Add an error class if this row contains a form error.
        foreach ($errors as $error_key => $error) {
            if (strpos($error_key, $key) === 0) {
                $rows[$key]['class'][] = 'error';
            }
        }
        $row_position++;
    }
    if (empty($rows)) {
        $rows[] = array(
            array(
                'data' => $form['#empty_text'],
                'colspan' => '3',
            ),
        );
    }
    $header = array(
        t('Name'),
        t('Weight'),
        t('Operations'),
    );
    $output = theme('table', array(
        'header' => $header,
        'rows' => $rows,
        'attributes' => array(
            'id' => 'taxonomy',
        ),
    ));
    $output .= drupal_render_children($form);
    $output .= theme('pager');
    return $output;
}

/**
 * Form function for the term edit form.
 *
 * @ingroup forms
 * @see taxonomy_form_term_submit()
 */
function taxonomy_form_term($form, &$form_state, $edit = array(), $vocabulary = NULL) {
    // During initial form build, add the term entity to the form state for use
    // during form building and processing. During a rebuild, use what is in the
    // form state.
    if (!isset($form_state['term'])) {
        $term = is_object($edit) ? $edit : (object) $edit;
        if (!isset($vocabulary) && isset($term->vid)) {
            $vocabulary = taxonomy_vocabulary_load($term->vid);
        }
        $defaults = array(
            'name' => '',
            'description' => '',
            'format' => NULL,
            'vocabulary_machine_name' => isset($vocabulary) ? $vocabulary->machine_name : NULL,
            'tid' => NULL,
            'weight' => 0,
        );
        foreach ($defaults as $key => $value) {
            if (!isset($term->{$key})) {
                $term->{$key} = $value;
            }
        }
        $form_state['term'] = $term;
    }
    else {
        $term = $form_state['term'];
        if (!isset($vocabulary) && isset($term->vid)) {
            $vocabulary = taxonomy_vocabulary_load($term->vid);
        }
    }
    $parent = array_keys(taxonomy_get_parents($term->tid));
    $form['#term'] = (array) $term;
    $form['#term']['parent'] = $parent;
    $form['#vocabulary'] = $vocabulary;
    // Check for confirmation forms.
    if (isset($form_state['confirm_delete'])) {
        return array_merge($form, taxonomy_term_confirm_delete($form, $form_state, $term->tid));
    }
    $form['name'] = array(
        '#type' => 'textfield',
        '#title' => t('Name'),
        '#default_value' => $term->name,
        '#maxlength' => 255,
        '#required' => TRUE,
        '#weight' => -5,
    );
    $form['description'] = array(
        '#type' => 'text_format',
        '#title' => t('Description'),
        '#default_value' => $term->description,
        '#format' => $term->format,
        '#weight' => 0,
    );
    $form['vocabulary_machine_name'] = array(
        '#type' => 'value',
        '#value' => isset($term->vocabulary_machine_name) ? $term->vocabulary_machine_name : $vocabulary->name,
    );
    $langcode = entity_language('taxonomy_term', $term);
    field_attach_form('taxonomy_term', $term, $form, $form_state, $langcode);
    $form['relations'] = array(
        '#type' => 'fieldset',
        '#title' => t('Relations'),
        '#collapsible' => TRUE,
        '#collapsed' => $vocabulary->hierarchy < 2,
        '#weight' => 10,
    );
    // taxonomy_get_tree and taxonomy_get_parents may contain large numbers of
    // items so we check for taxonomy_override_selector before loading the
    // full vocabulary. Contrib modules can then intercept before
    // hook_form_alter to provide scalable alternatives.
    if (!variable_get('taxonomy_override_selector', FALSE)) {
        $parent = array_keys(taxonomy_get_parents($term->tid));
        $children = taxonomy_get_tree($vocabulary->vid, $term->tid);
        // A term can't be the child of itself, nor of its children.
        foreach ($children as $child) {
            $exclude[] = $child->tid;
        }
        $exclude[] = $term->tid;
        $tree = taxonomy_get_tree($vocabulary->vid);
        $options = array(
            '<' . t('root') . '>',
        );
        if (empty($parent)) {
            $parent = array(
                0,
            );
        }
        foreach ($tree as $item) {
            if (!in_array($item->tid, $exclude)) {
                $options[$item->tid] = str_repeat('-', $item->depth) . $item->name;
            }
        }
        $form['relations']['parent'] = array(
            '#type' => 'select',
            '#title' => t('Parent terms'),
            '#options' => $options,
            '#default_value' => $parent,
            '#multiple' => TRUE,
        );
    }
    $form['relations']['weight'] = array(
        '#type' => 'textfield',
        '#title' => t('Weight'),
        '#size' => 6,
        '#default_value' => $term->weight,
        '#description' => t('Terms are displayed in ascending order by weight.'),
        '#required' => TRUE,
    );
    $form['vid'] = array(
        '#type' => 'value',
        '#value' => $vocabulary->vid,
    );
    $form['tid'] = array(
        '#type' => 'value',
        '#value' => $term->tid,
    );
    $form['actions'] = array(
        '#type' => 'actions',
    );
    $form['actions']['submit'] = array(
        '#type' => 'submit',
        '#value' => t('Save'),
        '#weight' => 5,
    );
    if ($term->tid) {
        $form['actions']['delete'] = array(
            '#type' => 'submit',
            '#value' => t('Delete'),
            '#access' => user_access("delete terms in {$vocabulary->vid}") || user_access('administer taxonomy'),
            '#weight' => 10,
        );
    }
    else {
        $form_state['redirect'] = $_GET['q'];
    }
    return $form;
}

/**
 * Validation handler for the term form.
 *
 * @see taxonomy_form_term()
 */
function taxonomy_form_term_validate($form, &$form_state) {
    entity_form_field_validate('taxonomy_term', $form, $form_state);
    // Ensure numeric values.
    if (isset($form_state['values']['weight']) && !is_numeric($form_state['values']['weight'])) {
        form_set_error('weight', t('Weight value must be numeric.'));
    }
}

/**
 * Submit handler to insert or update a term.
 *
 * @see taxonomy_form_term()
 */
function taxonomy_form_term_submit($form, &$form_state) {
    if ($form_state['triggering_element']['#value'] == t('Delete')) {
        // Execute the term deletion.
        if ($form_state['values']['delete'] === TRUE) {
            return taxonomy_term_confirm_delete_submit($form, $form_state);
        }
        // Rebuild the form to confirm term deletion.
        $form_state['rebuild'] = TRUE;
        $form_state['confirm_delete'] = TRUE;
        return;
    }
    $term = taxonomy_form_term_submit_build_taxonomy_term($form, $form_state);
    $status = taxonomy_term_save($term);
    switch ($status) {
        case SAVED_NEW:
            drupal_set_message(t('Created new term %term.', array(
                '%term' => $term->name,
            )));
            watchdog('taxonomy', 'Created new term %term.', array(
                '%term' => $term->name,
            ), WATCHDOG_NOTICE, l(t('edit'), 'taxonomy/term/' . $term->tid . '/edit'));
            break;
        case SAVED_UPDATED:
            drupal_set_message(t('Updated term %term.', array(
                '%term' => $term->name,
            )));
            watchdog('taxonomy', 'Updated term %term.', array(
                '%term' => $term->name,
            ), WATCHDOG_NOTICE, l(t('edit'), 'taxonomy/term/' . $term->tid . '/edit'));
            // Clear the page and block caches to avoid stale data.
            cache_clear_all();
            break;
    }
    $current_parent_count = empty($form_state['values']['parent']) ? 0 : count((array) $form_state['values']['parent']);
    $previous_parent_count = empty($form['#term']['parent']) ? 0 : count((array) $form['#term']['parent']);
    // Root doesn't count if it's the only parent.
    if ($current_parent_count == 1 && isset($form_state['values']['parent'][0])) {
        $current_parent_count = 0;
        $form_state['values']['parent'] = array();
    }
    // If the number of parents has been reduced to one or none, do a check on the
    // parents of every term in the vocabulary value.
    if ($current_parent_count < $previous_parent_count && $current_parent_count < 2) {
        taxonomy_check_vocabulary_hierarchy($form['#vocabulary'], $form_state['values']);
    }
    elseif ($current_parent_count > $previous_parent_count && $form['#vocabulary']->hierarchy < 2) {
        $form['#vocabulary']->hierarchy = $current_parent_count == 1 ? 1 : 2;
        taxonomy_vocabulary_save($form['#vocabulary']);
    }
    $form_state['values']['tid'] = $term->tid;
    $form_state['tid'] = $term->tid;
}

/**
 * Updates the form state's term entity by processing this submission's values.
 */
function taxonomy_form_term_submit_build_taxonomy_term($form, &$form_state) {
    $term = $form_state['term'];
    entity_form_submit_build_entity('taxonomy_term', $term, $form, $form_state);
    // Convert text_format field into values expected by taxonomy_term_save().
    $description = $form_state['values']['description'];
    $term->description = $description['value'];
    $term->format = $description['format'];
    return $term;
}

/**
 * Form builder for the term delete form.
 *
 * @ingroup forms
 * @see taxonomy_term_confirm_delete_submit()
 */
function taxonomy_term_confirm_delete($form, &$form_state, $tid) {
    $term = taxonomy_term_load($tid);
    // Always provide entity id in the same form key as in the entity edit form.
    $form['tid'] = array(
        '#type' => 'value',
        '#value' => $tid,
    );
    $form['#term'] = $term;
    $form['type'] = array(
        '#type' => 'value',
        '#value' => 'term',
    );
    $form['name'] = array(
        '#type' => 'value',
        '#value' => $term->name,
    );
    $form['vocabulary_machine_name'] = array(
        '#type' => 'value',
        '#value' => $term->vocabulary_machine_name,
    );
    $form['delete'] = array(
        '#type' => 'value',
        '#value' => TRUE,
    );
    return confirm_form($form, t('Are you sure you want to delete the term %title?', array(
        '%title' => $term->name,
    )), 'admin/structure/taxonomy', t('Deleting a term will delete all its children if there are any. This action cannot be undone.'), t('Delete'), t('Cancel'));
}

/**
 * Submit handler to delete a term after confirmation.
 *
 * @see taxonomy_term_confirm_delete()
 */
function taxonomy_term_confirm_delete_submit($form, &$form_state) {
    taxonomy_term_delete($form_state['values']['tid']);
    taxonomy_check_vocabulary_hierarchy($form['#vocabulary'], $form_state['values']);
    drupal_set_message(t('Deleted term %name.', array(
        '%name' => $form_state['values']['name'],
    )));
    watchdog('taxonomy', 'Deleted term %name.', array(
        '%name' => $form_state['values']['name'],
    ), WATCHDOG_NOTICE);
    $form_state['redirect'] = 'admin/structure/taxonomy';
    cache_clear_all();
}

/**
 * Form builder for the vocabulary delete confirmation form.
 *
 * @ingroup forms
 * @see taxonomy_vocabulary_confirm_delete_submit()
 */
function taxonomy_vocabulary_confirm_delete($form, &$form_state, $vid) {
    $vocabulary = taxonomy_vocabulary_load($vid);
    // Always provide entity id in the same form key as in the entity edit form.
    $form['vid'] = array(
        '#type' => 'value',
        '#value' => $vid,
    );
    $form['#vocabulary'] = $vocabulary;
    $form['#id'] = 'taxonomy_vocabulary_confirm_delete';
    $form['type'] = array(
        '#type' => 'value',
        '#value' => 'vocabulary',
    );
    $form['name'] = array(
        '#type' => 'value',
        '#value' => $vocabulary->name,
    );
    $form['#submit'] = array(
        'taxonomy_vocabulary_confirm_delete_submit',
    );
    return confirm_form($form, t('Are you sure you want to delete the vocabulary %title?', array(
        '%title' => $vocabulary->name,
    )), 'admin/structure/taxonomy', t('Deleting a vocabulary will delete all the terms in it. This action cannot be undone.'), t('Delete'), t('Cancel'));
}

/**
 * Submit handler to delete a vocabulary after confirmation.
 *
 * @see taxonomy_vocabulary_confirm_delete()
 */
function taxonomy_vocabulary_confirm_delete_submit($form, &$form_state) {
    $status = taxonomy_vocabulary_delete($form_state['values']['vid']);
    drupal_set_message(t('Deleted vocabulary %name.', array(
        '%name' => $form_state['values']['name'],
    )));
    watchdog('taxonomy', 'Deleted vocabulary %name.', array(
        '%name' => $form_state['values']['name'],
    ), WATCHDOG_NOTICE);
    $form_state['redirect'] = 'admin/structure/taxonomy';
    cache_clear_all();
}

/**
 * Form builder to confirm resetting a vocabulary to alphabetical order.
 *
 * @ingroup forms
 * @see taxonomy_vocabulary_confirm_reset_alphabetical_submit()
 */
function taxonomy_vocabulary_confirm_reset_alphabetical($form, &$form_state, $vid) {
    $vocabulary = taxonomy_vocabulary_load($vid);
    $form['type'] = array(
        '#type' => 'value',
        '#value' => 'vocabulary',
    );
    $form['vid'] = array(
        '#type' => 'value',
        '#value' => $vid,
    );
    $form['machine_name'] = array(
        '#type' => 'value',
        '#value' => $vocabulary->machine_name,
    );
    $form['name'] = array(
        '#type' => 'value',
        '#value' => $vocabulary->name,
    );
    $form['reset_alphabetical'] = array(
        '#type' => 'value',
        '#value' => TRUE,
    );
    return confirm_form($form, t('Are you sure you want to reset the vocabulary %title to alphabetical order?', array(
        '%title' => $vocabulary->name,
    )), 'admin/structure/taxonomy/' . $vocabulary->machine_name, t('Resetting a vocabulary will discard all custom ordering and sort items alphabetically.'), t('Reset to alphabetical'), t('Cancel'));
}

/**
 * Submit handler to reset a vocabulary to alphabetical order after confirmation.
 *
 * @see taxonomy_vocabulary_confirm_reset_alphabetical()
 */
function taxonomy_vocabulary_confirm_reset_alphabetical_submit($form, &$form_state) {
    db_update('taxonomy_term_data')->fields(array(
        'weight' => 0,
    ))
        ->condition('vid', $form_state['values']['vid'])
        ->execute();
    drupal_set_message(t('Reset vocabulary %name to alphabetical order.', array(
        '%name' => $form_state['values']['name'],
    )));
    watchdog('taxonomy', 'Reset vocabulary %name to alphabetical order.', array(
        '%name' => $form_state['values']['name'],
    ), WATCHDOG_NOTICE);
    $form_state['redirect'] = 'admin/structure/taxonomy/' . $form_state['values']['machine_name'];
}