'; + + print_box_start('generalbox', 'big-tag-cloud-box'); + print_tag_cloud(rand_tags_count(60), true, 170,70); + print_box_end(); + + print_footer(); + + ?> Index: lang/en_utf8/tag.php =================================================================== RCS file: lang/en_utf8/tag.php diff -N lang/en_utf8/tag.php *** /dev/null 1 Jan 1970 00:00:00 -0000 --- lang/en_utf8/tag.php 1 Jan 1970 00:00:00 -0000 *************** *** 0 **** --- 1,33 ---- + Index: tag/manage.php =================================================================== RCS file: tag/manage.php diff -N tag/manage.php *** /dev/null 1 Jan 1970 00:00:00 -0000 --- tag/manage.php 1 Jan 1970 00:00:00 -0000 *************** *** 0 **** --- 1,57 ---- + dirroot.'/lib/weblib.php'); + + require_login(); + + if( empty($CFG->usetags)) { + error(get_string('tagsaredisabled', 'tag')); + } + + //managing tags requires moodle/tag:managetags capability + $systemcontext = get_context_instance(CONTEXT_SYSTEM); + require_capability('moodle/tag:managetags', $systemcontext); + + $tagschecked = optional_param('tagschecked', array()); + $action = optional_param('action', '', PARAM_ALPHA); + + $navlinks = array(); + $navlinks[] = array('name' => get_string('tags', 'tag'), 'link' => "{$CFG->wwwroot}/tag/search.php", 'type' => ''); + $navlinks[] = array('name' => get_string('managetags', 'tag'), 'link' => '', 'type' => ''); + + $navigation = build_navigation($navlinks); + print_header_simple(get_string('managetags', 'tag'), '', $navigation); + + switch($action) { + + case 'delete': + + $notice = tag_name_from_string(implode($tagschecked, ', ')); + $notice = str_replace(',', ', ', $notice); + $notice .= ' -- ' . get_string('deleted','tag'); + notify($notice , 'green'); + + tag_delete(implode($tagschecked, ',')); + break; + case 'reset': + + $notice = tag_name_from_string(implode($tagschecked, ', ')); + $notice = str_replace(',', ', ', $notice); + $notice .= ' -- ' . get_string('reset','tag'); + notify($notice , 'green'); + + tag_flag_reset(implode($tagschecked, ',')); + break; + } + + echo '
'; + + print_tag_management_list(); + + echo '
'; + + print_footer(); + + ?> Index: user/tag.php =================================================================== RCS file: user/tag.php diff -N user/tag.php *** /dev/null 1 Jan 1970 00:00:00 -0000 --- user/tag.php 1 Jan 1970 00:00:00 -0000 *************** *** 0 **** --- 1,41 ---- + usetags)) { + error('Tags are disabled!'); + } + + switch ($action) { + case 'addinterest': + $id = optional_param('id', 0, PARAM_INT); + $name = optional_param('name', '', PARAM_TEXT); + + if (empty($name) && $id) { + $name = tag_name($id); + } + + tag_an_item('user',$USER->id, $name); + + if (!empty($name) && !$id) { + $id = tag_id($name); + } + + redirect($CFG->wwwroot.'/tag/index.php?id='.$id); + break; + case 'flaginappropriate': + + $id = required_param('id', PARAM_INT); + + tag_flag_inappropriate($id); + + redirect($CFG->wwwroot.'/tag/index.php?id='.$id, get_string('responsiblewillbenotified','tag')); + break; + } + + ?> Index: tag/tag_autocomplete.php =================================================================== RCS file: tag/tag_autocomplete.php diff -N tag/tag_autocomplete.php *** /dev/null 1 Jan 1970 00:00:00 -0000 --- tag/tag_autocomplete.php 1 Jan 1970 00:00:00 -0000 *************** *** 0 **** --- 1,19 ---- + usetags)) { + error(get_string('tagsaredisabled', 'tag')); + } + + $query = optional_param('query', 0, PARAM_TEXT); + $query = tag_normalize($query); + + $similar_tags = similar_tags($query); + + $count = 0; + foreach ($similar_tags as $tag){ + echo $tag->name . "\t" . $tag->id . "\n"; + } + + ?> Index: tag/edit_form.php =================================================================== RCS file: tag/edit_form.php diff -N tag/edit_form.php *** /dev/null 1 Jan 1970 00:00:00 -0000 --- tag/edit_form.php 1 Jan 1970 00:00:00 -0000 *************** *** 0 **** --- 1,33 ---- + dirroot.'/lib/formslib.php'); + + class tag_edit_form extends moodleform { + + function definition () { + + $mform =& $this->_form; + + $mform->addElement('header', 'tag', get_string('description','tag')); + + $mform->addElement('hidden', 'id'); + + $mform->addElement('htmleditor', 'description', get_string('description', 'tag'), array('rows'=>20)); + $mform->setType('description', PARAM_CLEANHTML); + + $mform->addElement('format', 'descriptionformat', get_string('format')); + + $mform->addElement('html', '
'); + $mform->addElement('html', ''); + + + $this->add_action_buttons(false, get_string('updatetag', 'tag')); + + } + + } + + ?> Index: tag/index.php =================================================================== RCS file: tag/index.php diff -N tag/index.php *** /dev/null 1 Jan 1970 00:00:00 -0000 --- tag/index.php 1 Jan 1970 00:00:00 -0000 *************** *** 0 **** --- 1,67 ---- + dirroot.'/lib/weblib.php'); + + require_login(); + + if( empty($CFG->usetags)) { + error(get_string('tagsaredisabled', 'tag')); + } + + $tagid = optional_param('id', 0, PARAM_INT); // tag id + $userpage = optional_param('userpage', 0, PARAM_INT); // which page to show + $perpage = optional_param('perpage', 16, PARAM_INT); + + $tag = tag_by_id($tagid); + + if(!$tag) { + redirect($CFG->wwwroot.'/tag/search.php'); + } + + $tagname = mb_convert_case($tag->name, MB_CASE_TITLE, "UTF-8"); + + $navlinks = array(); + $navlinks[] = array('name' => get_string('tags', 'tag'), 'link' => "{$CFG->wwwroot}/tag/search.php", 'type' => ''); + $navlinks[] = array('name' => $tagname, 'link' => '', 'type' => ''); + + $navigation = build_navigation($navlinks); + print_header_simple(get_string('tag', 'tag') . ' - ' . $tagname, '', $navigation); + + $systemcontext = get_context_instance(CONTEXT_SYSTEM); + if ($tag->flag > 0 && has_capability('moodle/tag:managetags', $systemcontext)) { + $tagname = '' . $tagname . ''; + } + + print_heading($tagname, '', 2); + + print_tag_management_box($tag); + + print_tag_description_box($tag); + + + $usercount = count_items_tagged_with($tagid,'user'); + + if ($usercount > 0) { + + print_heading(get_string('userstaggedwith', 'tag') . ' ' . $tagname . ': ' . $usercount, '', 3); + + $baseurl = $CFG->wwwroot.'/tag/index.php?id=' . $tagid; + + print_paging_bar($usercount, $userpage, $perpage, $baseurl.'&', 'userpage'); + + print_tagged_users_table($tag, 4, $userpage * $perpage, $perpage); + + + } + //print_box_start('generalbox', 'small-tag-cloud-box'); + // print_tag_cloud(15,170,80); + //print_box_end(); + + print_footer(); + + + + + ?> Index: tag/lib.php =================================================================== RCS file: tag/lib.php diff -N tag/lib.php *** /dev/null 1 Jan 1970 00:00:00 -0000 --- tag/lib.php 1 Jan 1970 00:00:00 -0000 *************** *** 0 **** --- 1,1461 ---- + tagtype = $tag_type; + $tag_object->userid = $USER->id; + + $systemcontext = get_context_instance(CONTEXT_SYSTEM); + $can_create_tags = has_capability('moodle/tag:createtags',$systemcontext); + + foreach ($tags as $tag_name) { + + $tag_object->name = $tag_name; + $tag_object->timemodified = time(); + + // if ( !record_exists('tag', 'name', $tag_name) && !empty($tag_name) && !is_numeric($tag_name) ) { + if ( $can_create_tags && !empty($tag_name) && !is_numeric($tag_name) ) { + insert_record('tag', $tag_object); + } + } + + return tags_id($normalized_tag_names_csv); + + } + + /** + * Deletes tags + * + * Ex 1: tag_delete('a very cool tag, another nice tag') + * Will delete the tags with names 'a very cool tag' and 'another nice tag' from the 'tags' table, if they exist! + * + * Ex 2: tag_delete('computers, 123, 143, algorithms') + * Will delete tags with names 'computers' and 'algorithms' and tags with ids 123 and 143. + * + * + * @param string $tag_names_or_ids_csv **normalized** tag names or ids of the tags to be deleted. + */ + + function tag_delete($tag_names_or_ids_csv) { + + //covert all ids to names + $tag_names_csv = tag_name_from_string($tag_names_or_ids_csv); + + //put apostrophes in names + $tag_names_csv_with_apos = "'" . str_replace(',', "','", $tag_names_csv) . "'"; + + delete_records_select('tag',"name IN ($tag_names_csv_with_apos)"); + + } + + /** + * Get all tags from the records + * + * @param string $tag_types_csv (optional, default value is "default". If '*' is passed, tags of any type will be returned). + * @param string $sort an order to sort the results in (optional, a valid SQL ORDER BY parameter). + * @param string $fields a comma separated list of fields to return + * (optional, by default 'id, tagtype, name'). The first field will be used as key for the + * array so must be a unique field such as 'id'. + */ + function get_all_tags($tag_types_csv="default", $sort, $fields = 'id, tagtype, name') { + + if ($tag_types_csv == '*'){ + return get_records('tag', '', '', $sort, $fields); + } + + $tag_types_csv_with_apos = "'" . str_replace(',', "','", $tag_types_csv ) . "'"; + + return get_records_list('tag', 'tagtype', $tag_types_csv_with_apos, $sort, $fields); + } + + /** + * Determines if a tag exists + * + * @param string $tag_name_or_id **normalized** tag name, or an id. + * @return true if exists or false otherwise + * + */ + function tag_exists($tag_name_or_id) { + + if (is_numeric($tag_name_or_id)) { + return record_exists('tag', 'id', $tag_name_or_id); + } + elseif (is_string($tag_name_or_id)) { + return record_exists('tag', 'name', $tag_name_or_id); + } + } + + /** + * Function that returns the id of a tag + * + * @param String $tag_name **normalized** name of the tag + * @return int id of the matching tag + */ + function tag_id($tag_name) { + $tag = get_record('tag', 'name', trim($tag_name), '', '', '', '', 'id'); + return $tag->id; + } + + /** + * Function that returns the ids of tags + * + * Ex: tags_id('computers, algorithms') + * + * @param String $tag_names_csv comma separated **normalized** tag names. + * @return Array array with the tags ids, indexed by their **normalized** names + */ + function tags_id($tag_names_csv) { + + $normalized_tag_names_csv = tag_normalize($tag_names_csv); + $tag_names_csv_with_apos = "'" . str_replace(',', "','", $normalized_tag_names_csv ) . "'"; + + $tag_objects = get_records_list('tag','name', $tag_names_csv_with_apos, "" , "name, id" ); + + $tags_ids = array(); + foreach ($tag_objects as $tag) { + $tags_ids[$tag->name] = $tag->id; + } + + return $tags_ids; + } + + /** + * Function that returns the name of a tag + * + * @param int $tag_id id of the tag + * @return String name of the tag with the id passed + */ + function tag_name($tag_id) { + $tag = get_record('tag', 'id', $tag_id, '', '', '', '', 'name'); + return $tag->name; + } + + /** + * Function that retrieves the names of tags given their ids + * + * @param String $tag_ids_csv comma separated tag ids + * @return Array an array with the tags names, indexed by their ids + */ + + function tags_name($tag_ids_csv) { + + $tag_ids_csv_with_apos = "'" . str_replace(',', "','", $tag_ids_csv ) . "'"; + + $tag_objects = get_records_list('tag','id', $tag_ids_csv_with_apos, "" , "name, id" ); + + $tags_names = array(); + foreach ($tag_objects as $tag) { + $tags_names[$tag->id] = $tag->name; + } + + return $tags_names; + } + + /** + * Function that retrieves a tag object by its id + * + * @param String $tag_id + * @return mixed a fieldset object containing the first matching record, or false if none found + */ + function tag_by_id($tag_id) { + + return get_record('tag','id',$tag_id); + } + + /** + * Function that retrieves a tag object by its name + * + * @param String $tag_name + * @return mixed a fieldset object containing the first matching record, or false if none found + */ + function tag_by_name($tag_name) { + $tag = get_record('tag','name',$tag_name); + return $tag; + } + + /** + * Returns comma separated ids of tags given a string with comma separated names or ids of tags + * + * Ex: tag_id_from_string('moodle, 12, education, 33, 11') + * might return the string '10,12,22,33,11' + * + * This is a helper function used by functions of this API to process function arguments ($tag_name_or_id) + * + * @param string $tag_names_or_ids_csv comma separated **normalized** names or ids of tags + * @return int comma separated ids of the tags + */ + function tag_id_from_string($tag_names_or_ids_csv) { + + $tag_names_or_ids = explode(',', $tag_names_or_ids_csv); + + $tag_ids = array(); + foreach ($tag_names_or_ids as $name_or_id) { + + if (is_numeric($name_or_id)){ + $tag_ids[] = $name_or_id; + } + elseif (is_string($name_or_id)) { + $tag_ids[] = tag_id( $name_or_id ); + } + + } + + $tag_ids_csv = implode(',',$tag_ids); + $tag_ids_csv = str_replace(' ', '', $tag_ids_csv); + + return rtrim($tag_ids_csv, ','); + } + + /** + * Returns comma separated **normalized** names of tags given a string with comma separated names or ids of tags + * + * Ex: tag_name_from_string('mOOdle, 12, eduCAtIOn, 33, 11') + * might return the string 'moodle,computers,education,algorithms,software' + * + * This is a helper function used by functions of this API to process function arguments ($tag_name_or_id) + * + * @param string $tag_names_or_ids_csv comma separated **normalized** names or ids of tags + * @return int comma separated ids of the tags + */ + function tag_name_from_string($tag_names_or_ids_csv) { + + $tag_names_or_ids = explode(',', $tag_names_or_ids_csv); + + $tag_names = array(); + foreach ($tag_names_or_ids as $name_or_id) { + + if (is_numeric($name_or_id)){ + $tag_names[] = tag_name($name_or_id); + } + elseif (is_string($name_or_id)) { + $tag_names[] = tag_normalize($name_or_id); + } + + } + + $tag_names_csv = implode(',',$tag_names); + + return rtrim($tag_names_csv, ','); + + } + + /** + * Associates a tag with an item + * + * Ex 1: tag_an_item('user', '1', 'hisTOrY, RELIGIONS, roman' ) + * This will tag an user whose id is 1 with "history", "religions", "roman" + * If the tag names passed do not exist, they will get created. + * + * Ex 2: tag_an_item('user', '1', 'hisTory, 12, 11, roman') + * This will tag an user whose id is 1 with 'history', 'roman' and with tags of ids 12 and 11 + * + * @param string $item_type name of the table where the item is stored. Ex: 'user' + * @param string $item_id id of the item to be tagged + * @param string $tag_names_or_ids_csv comma separated tag names (can be unormalized) or ids of existing tags + * @param string $tag_type type of the tags that are beeing added (optional, default value is "default") + */ + + function tag_an_item($item_type, $item_id, $tag_names_or_ids_csv, $tag_type="default") { + + $norm_tag_names_or_ids_csv = tag_normalize($tag_names_or_ids_csv); + + //convert any tag ids passed to their corresponding tag names + $tag_names_csv = tag_name_from_string($norm_tag_names_or_ids_csv); + + //create the tags + $tags_created_ids = tag_create($tag_names_csv,$tag_type); + + $tag_instance = new StdClass; + $tag_instance->itemtype = $item_type; + $tag_instance->itemid = $item_id; + + //create tag instances + foreach ($tags_created_ids as $tag_id) { + $tag_instance->tagid = $tag_id; + insert_record('tag_instance',$tag_instance); + } + + + // update_tag_correlations($item_type, $item_id); + + } + + + /** + * Updates the tags associated with an item + * + * Ex 1: + * Suppose user 1 is tagged only with "algorithms", "computers" and "software" + * By calling update_item_tags('user', 1, 'algorithms, software, mathematics') + * User 1 will now be tagged only with "algorithms", "software" and "mathematics" + * + * Ex 2: + * update_item_tags('user', '1', 'algorithms, 12, 13') + * User 1 will now be tagged only with "algorithms", and with tags of ids 12 and 13 + * + * + * @param string $item_type name of the table where the item is stored. Ex: 'user' + * @param string $item_id id of the item to be tagged + * @param string $tag_names_or_ids_csv comma separated tag names (can be unormalized) or ids of existing tags + * @param string $tag_type type of the tags that are beeing added (optional, default value is "default") + */ + + function update_item_tags($item_type, $item_id, $tag_names_or_ids_csv, $tag_type="default") { + + //if $tag_names_csv is an empty string, remove all tag associations of the item + if( empty($tag_names_or_ids_csv) ){ + untag_an_item($item_type, $item_id); + return; + } + + //normalize tags names + $norm_tag_names_or_ids_csv = tag_normalize($tag_names_or_ids_csv); + + //convert any tag ids passed to their corresponding tag names + $tag_names_csv = tag_name_from_string($norm_tag_names_or_ids_csv); + + //associate the tags passed with the item + tag_an_item($item_type, $item_id, $tag_names_csv, $tag_type ); + + //get the ids of the tags passed + $existing_and_new_tags_ids = tags_id( $tag_names_csv ); + + // delete any tag instance with $item_type and $item_id + // that are not in $tag_names_csv + $tags_id_csv = "'" . implode("','", $existing_and_new_tags_ids) . "'" ; + + $select = " + itemid = '{$item_id}' + AND + itemtype = '{$item_type}' + AND + tagid NOT IN ({$tags_id_csv}) + "; + + delete_records_select('tag_instance', $select); + + } + + /** + * Removes the association of an item with a tag + * + * Ex: untag_an_item('user', '1', 'history, 11, roman' ) + * The user with id 1 will no longer be tagged with 'history', 'roman' and the tag of id 11 + * Calling untag_an_item('user','1') will remove all tags associated with user 1. + * + * @param string $item_type name of the table where the item is stored. Ex: 'user' + * @param string $item_id id of the item to be untagged + * @param string $tag_names_or_ids_csv comma separated tag **normalized** names or ids of existing tags (optional, + * if none is given, all tags of the item will be removed) + */ + + function untag_an_item($item_type, $item_id, $tag_names_or_ids_csv='') { + + if ($tag_names_or_ids_csv == ""){ + + delete_records('tag_instance','itemtype', $item_type, 'itemid', $item_id); + + } + else { + + $tag_ids_csv = tag_id_from_string($norm_tag_names_or_ids_csv); + + $tag_ids_csv_with_apos = "'" . str_replace(',', "','", $tag_ids_csv ) . "'"; + + delete_records_select('tag_instance', + "tagid IN ($tags_id_csv_with_apos) AND itemtype='$item_type' AND itemid='$item_id'"); + } + + //update_tag_correlations($item_type, $item_id); + + } + + /** + * Function that gets the tags that are associated with an item + * + * Ex: get_item_tags('user', '1') + * + * @param string $item_type name of the table where the item is stored. Ex: 'user' + * @param string $item_id id of the item beeing queried + * @param string $fields tag fields to be selected (optional, default is 'id, name, tagtype') + * @param int $limitfrom return a subset of records, starting at this point (optional, required if $limitnum is set). + * @param int $limitnum return a subset comprising this many records (optional, required if $limitfrom is set). + * @return mixed an array of objects, or false if no records were found or an error occured. + */ + + function get_item_tags($item_type, $item_id, $fields='id, name, tagtype, flag', $limitfrom='', $limitnum='') { + + global $CFG; + + $fields = 'tg.' . $fields; + $fields = str_replace(',', ',tg.', $fields); + + $query = " + SELECT + {$fields} + FROM + {$CFG->prefix}tag_instance ti + INNER JOIN + {$CFG->prefix}tag tg + ON + tg.id = ti.tagid + WHERE + ti.itemtype = '{$item_type}' AND + ti.itemid = '{$item_id}'"; + + return get_records_sql($query, $limitfrom, $limitnum); + + } + + + + /** + * Function that returns the items of a certain type associated with a certain tag + * + * Ex 1: get_items_tagged_with('user', 'banana') + * Ex 2: get_items_tagged_with('user', '11') + * + * @param string $item_type name of the table where the item is stored. Ex: 'user' + * @param string $tag_name_or_id is a single **normalized** tag name or the id of a tag + * @param string $sort an order to sort the results in (optional, a valid SQL ORDER BY parameter). + * (to avoid field name ambiguity in the query, use the identifier "it" Ex: 'it.name ASC' ) + * @param string $fields a comma separated list of fields to return + * (optional, by default all fields are returned). The first field will be used as key for the + * array so must be a unique field such as 'id'. + * @param int $limitfrom return a subset of records, starting at this point (optional, required if $limitnum is set). + * @param int $limitnum return a subset comprising this many records (optional, required if $limitfrom is set). + * @return mixed an array of objects indexed by their ids, or false if no records were found or an error occured. + */ + + function get_items_tagged_with($item_type, $tag_name_or_id, $sort='', $fields='*', $limitfrom='', $limitnum='') { + + global $CFG; + + $tag_id = tag_id_from_string($tag_name_or_id); + + $fields = 'it.' . $fields; + $fields = str_replace(',', ',it.', $fields); + + if ($sort) { + $sort = ' ORDER BY '. $sort; + } + + $query = " + SELECT + {$fields} + FROM + {$CFG->prefix}{$item_type} it + INNER JOIN + {$CFG->prefix}tag_instance tt + ON + it.id = tt.itemid + WHERE + tt.itemtype = '{$item_type}' AND + tt.tagid = '{$tag_id}' + {$sort} + "; + + + return get_records_sql($query, $limitfrom, $limitnum); + + } + + /** + * Returns the number of items tagged with a tag + * + * @param string $tag_name_or_id is a single **normalized** tag name or the id of a tag + * @param string $item_type name of the table where the item is stored. Ex: 'user' (optional, if none is set any + * type will be counted) + * @return int the count. If an error occurrs, 0 is returned. + */ + function count_items_tagged_with($tag_name_or_id, $item_type='') { + + global $CFG; + + $tag_id = tag_id_from_string($tag_name_or_id); + + if (empty($item_type)){ + $query = " + SELECT + COUNT(*) AS count + FROM + {$CFG->prefix}tag_instance tt + WHERE + tagid = {$tag_id}"; + } + else + { + $query = " + SELECT + COUNT(*) AS count + FROM + {$CFG->prefix}{$item_type} it + INNER JOIN + {$CFG->prefix}tag_instance tt + ON + it.id = tt.itemid + WHERE + tt.itemtype = '{$item_type}' AND + tt.tagid = '{$tag_id}' "; + } + + + return count_records_sql($query); + + } + + + /** + * Determines if an item is tagged with a certain tag + * + * @param string $item_type name of the table where the item is stored. Ex: 'user' + * @param string $item_id id of the item beeing queried + * @param string $tag_name_or_id is a single **normalized** tag name or the id of a tag + * @return bool true if a matching record exists, else false. + */ + function is_item_tagged_with($item_type,$item_id, $tag_name_or_id) { + + $tag_id = tag_id_from_string($tag_name_or_id); + + return record_exists('tag_instance','itemtype',$item_type,'itemid',$item_id, 'tagid', $tag_id); + } + + /** + * Search for tags with names that match some text + * + * @param string $text string that the tag names will be matched against + * @param boolean $ordered If true, tags are ordered by their popularity. If false, no ordering. + * @param int $limitfrom return a subset of records, starting at this point (optional, required if $limitnum is set). + * @param int $limitnum return a subset comprising this many records (optional, required if $limitfrom is set). + * @return mixed an array of objects, or false if no records were found or an error occured. + */ + + function search_tags($text, $ordered=true, $limitfrom='' , $limitnum='' ) { + + global $CFG; + + $text = tag_normalize($text); + + if ($ordered) { + $query = " + SELECT + tg.id, tg.name, COUNT(ti.id) AS count + FROM + {$CFG->prefix}tag tg + LEFT JOIN + {$CFG->prefix}tag_instance ti + ON + tg.id = ti.tagid + WHERE + tg.name + LIKE + '%{$text}%' + GROUP BY + tg.id + ORDER BY + count + DESC"; + } else { + $query = " + SELECT + tg.id, tg.name + FROM + {$CFG->prefix}tag tg + WHERE + tg.name + LIKE + '%{$text}%' + "; + } + + + return get_records_sql($query, $limitfrom , $limitnum); + + } + + /** + * Function that returns tags that start with some text + * + * @param string $text string that the tag names will be matched against + * @param int $limitfrom return a subset of records, starting at this point (optional, required if $limitnum is set). + * @param int $limitnum return a subset comprising this many records (optional, required if $limitfrom is set). + * @return mixed an array of objects, or false if no records were found or an error occured. + */ + function similar_tags($text, $limitfrom='' , $limitnum='' ) { + + global $CFG; + + $text = tag_normalize($text); + + $query = " + SELECT + * + FROM + {$CFG->prefix}tag t + WHERE + t.name + LIKE + '{$text}%' + "; + + return get_records_sql($query, $limitfrom , $limitnum); + } + + /** + * Returns tags related to a tag + * + * Related tags of a tag come from two sources: + * - manually added related tags, which are tag_instance entries for that tag + * - correlated tags, which are a calculated + * + * @param string $tag_name_or_id is a single **normalized** tag name or the id of a tag + * @param int $limitnum return a subset comprising this many records (optional, default is 10) + * @return mixed an array of tag objects + */ + + function related_tags($tag_name_or_id, $limitnum=10) { + + $tag_id = tag_id_from_string($tag_name_or_id); + + //gets the manually added related tags + $manual_related_tags = get_item_tags('tag',$tag_id); + if ($manual_related_tags == false) $manual_related_tags = array(); + + //gets the correlated tags + $automatic_related_tags = correlated_tags($tag_id); + if ($automatic_related_tags == false) $automatic_related_tags = array(); + + $related_tags = array_merge($manual_related_tags,$automatic_related_tags); + + return array_slice( object_array_unique($related_tags) , 0 , $limitnum ); + + + } + + /** + * Returns the correlated tags of a tag + * The correlated tags are retrieved from the tag_correlation table, which is a caching table. + * + * @param string $tag_name_or_id is a single **normalized** tag name or the id of a tag + * @return mixed an array of tag objects + */ + function correlated_tags($tag_name_or_id) { + + $tag_id = tag_id_from_string($tag_name_or_id); + + $tag_correlation = get_record('tag_correlation','tagid',$tag_id); + + $tags_id_csv_with_apos = stripcslashes($tag_correlation->correlatedtags); + + return get_records_select('tag', "id IN ({$tags_id_csv_with_apos})", '', 'id, name, tagtype'); + } + + /** + * Recalculates tag correlations of all the tags associated with an item + * This function could be called whenever the tags associations with an item changes + * ( for example when tag_an_item() or untag_an_item() is called ) + * + * @param string $item_type name of the table where the item is stored. Ex: 'user' + * @param string $item_id id of the item + */ + function update_tag_correlations($item_type, $item_id) { + + $item_tags = get_item_tags($item_type, $item_id); + + foreach ($item_tags as $tag) { + cache_correlated_tags($tag->id); + } + } + + /** + * Calculates and stores the correlated tags of a tag. + * The correlations are stored in the 'tag_correlation' table. + * + * Two tags are correlated if they appear together a lot. + * Ex.: Users tagged with "computers" will probably also be tagged with "algorithms". + * + * The rationale for the 'tag_correlation' table is performance. + * It works as a cache for a potentially heavy load query done at the 'tag_instance' table. + * So, the 'tag_correlation' table stores redundant information derived from the 'tag_instance' table. + * + * @param string $tag_name_or_id is a single **normalized** tag name or the id of a tag + * @param number $min_correlation cutoff percentage (optional, default is 0.25) + * @param int $limitnum return a subset comprising this many records (optional, default is 10) + */ + function cache_correlated_tags($tag_name_or_id, $min_correlation=0.25, $limitnum=10) { + + global $CFG; + + $tag_id = tag_id_from_string($tag_name_or_id); + + // query that counts how many times any tag appears together in items + // with the tag passed as argument ($tag_id) + $query = + " SELECT + tb.tagid , COUNT(*) nr + FROM + {$CFG->prefix}tag_instance ta + INNER JOIN + {$CFG->prefix}tag_instance tb + ON + ta.itemid = tb.itemid + WHERE + ta.tagid = {$tag_id} + GROUP BY + tb.tagid + ORDER BY + nr DESC"; + + $tag_correlations = get_records_sql($query, 0, $limitnum); + + $tags_id_csv_with_apos = "'"; + $cutoff = $tag_correlations[$tag_id]->nr * $min_correlation; + + foreach($tag_correlations as $correlation) { + if($correlation->nr >= $cutoff && $correlation->tagid != $tag_id ){ + $tags_id_csv_with_apos .= $correlation->tagid."','"; + } + } + $tags_id_csv_with_apos = substr($tags_id_csv_with_apos,0,-2); + + + //saves correlation info in the caching table + + $tag_correlation_obj = get_record('tag_correlation','tagid',$tag_id); + + if ($tag_correlation_obj) { + $tag_correlation_obj->correlatedtags = addslashes($tags_id_csv_with_apos); + update_record('tag_correlation',$tag_correlation_obj); + } + else { + $tag_correlation_obj = new StdClass; + $tag_correlation_obj->tagid = $tag_id; + $tag_correlation_obj->correlatedtags = addslashes($tags_id_csv_with_apos); + insert_record('tag_correlation',$tag_correlation_obj); + } + + + } + + /** + * This function cleans up the 'tag_instance' table + * It removes orphans in 'tag_instances' table + * + */ + function tag_instance_table_cleanup() { + + global $CFG; + + //get the itemtypes present in the 'tag_instance' table + $query = " + SELECT + DISTINCT(itemtype) + FROM + {$CFG->prefix}tag_instance + "; + + $items_types = get_records_sql($query); + + // for each itemtype, remove tag_instances that are orphans + // That is: For a given tag_instance, if in the itemtype table there's no entry with id equal to itemid, + // then this tag_instance is an orphan and it will be removed. + foreach ($items_types as $type) { + + $query = " + {$CFG->prefix}tag_instance.id + IN + ( SELECT sq1.id + FROM + (SELECT sq2.* + FROM {$CFG->prefix}tag_instance sq2 + LEFT JOIN {$CFG->prefix}{$type->itemtype} item + ON sq2.itemid = item.id + WHERE item.id IS NULL + AND sq2.itemtype = '{$type->itemtype}') + sq1 + ) "; + + delete_records_select('tag_instance', $query); + } + + // remove tag_instances that are orphans because tagid does not correspond to an + // existing tag + $query = " + {$CFG->prefix}tag_instance.id + IN + (SELECT sq1.id + FROM + (SELECT sq2.* + FROM {$CFG->prefix}tag_instance sq2 + LEFT JOIN {$CFG->prefix}tag tg + ON sq2.tagid = tg.id + WHERE tg.id IS NULL ) + sq1 + ) + "; + + delete_records_select('tag_instance', $query); + } + + + /** + * Function that normalizes a tag name + * + * Ex: tag_normalize('bANAana') -> returns 'banana' + * tag_normalize('lots of spaces') -> returns 'lots of spaces' + * tag_normalize('%!%!% non alpha numeric %!%!%') -> returns 'non alpha numeric' + * tag_normalize('tag one, TAG TWO, TAG three, and anotheR tag') + * -> returns 'tag one,tag two,tag three,and another tag' + * + * @param string $tag_names_csv unnormalized CSV tag names + * @return string **normalized** CSV tag names + */ + + function tag_normalize($tag_names_csv) { + + $tags = explode(',', $tag_names_csv); + + if(sizeof($tags) > 1) { + + foreach ($tags as &$tag) { + $tag = tag_normalize($tag); + } + + return implode(',' , $tags); + + } + + // only one tag was passed + else { + // value is converted to lowercase and all non-alphanumeric caracters are removed + //$value = preg_replace('|[^\w ]|i', '', strtolower(trim($tag_names_csv))); + $value = preg_replace('|[\!\@\#\$\%\^\&\*\(\)\-\+\=\~\`\.\[\]\{\}\:\;\\\/\<\>\|]|i', '', moodle_strtolower(trim($tag_names_csv))); + + //removes excess white spaces + $value = preg_replace('/\s\s+/', ' ', $value); + + return $value; + } + + } + + function is_tag_clean($tag_names_csv) + { + + } + + function tag_flag_inappropriate($tag_names_or_ids_csv){ + + $tag_ids_csv = tag_id_from_string($tag_names_or_ids_csv); + + $tag_ids = explode(',', $tag_ids_csv); + + foreach ($tag_ids as $id){ + $tag = get_record('tag','id',$id, '', '', '', '', 'id,flag'); + + $tag->flag++; + $tag->timemodified = time(); + + update_record('tag', $tag); + } + } + + function tag_flag_reset($tag_names_or_ids_csv){ + + global $CFG; + + $tag_ids_csv = tag_id_from_string($tag_names_or_ids_csv); + + $tag_ids_csv_with_apos = "'" . str_replace(',', "','", $tag_ids_csv) . "'"; + + $timemodified = time(); + + $query = " + UPDATE + {$CFG->prefix}tag tg + SET + tg.flag = 0, + tg.timemodified = {$timemodified} + WHERE + tg.id + IN + ({$tag_ids_csv_with_apos}) + "; + + execute_sql($query, false); + } + + /** + * Function that returns comma separated HTML links to the tag pages of the tags passed + * + * @param array $tag_objects an array of tag objects + * @return string CSV, HTML links to tag pages + */ + + function tag_links_csv($tag_objects) { + + global $CFG; + $tag_links = ''; + + $systemcontext = get_context_instance(CONTEXT_SYSTEM); + $can_manage_tags = has_capability('moodle/tag:managetags', $systemcontext); + + foreach ($tag_objects as $tag){ + //highlight tags that have been flagged as inappropriate for those who can manage them + $tagname = $tag->name; + if ($tag->flag > 0 && $can_manage_tags) { + $tagname = '' . $tagname . ''; + } + $tag_links .= ' '.$tagname.','; + } + + return rtrim($tag_links, ','); + } + + /** + * Function that returns comma separated names of the tags passed + * Example of string that might be returned: 'history, wars, greek history' + * + * @param array $tag_objects + * @return string CSV tag names + */ + + function tag_names_csv($tag_objects) { + + $tag_names = ''; + + foreach ($tag_objects as $tag){ + $tag_names .= $tag->name.', '; + } + + return rtrim($tag_names, ', '); + } + + + /** + * Returns a number of random tags, ordered by their popularity + * + * @param int $nr_of_tags number of random tags to be returned + * @param unknown_type $tag_type + * @return mixed an array of tag objects with the following fields: id, name and count + */ + function rand_tags_count($nr_of_tags=20, $tag_type = 'default') { + + global $CFG; + + $tags = get_all_tags($tag_type); + + if(sizeof($tags) < $nr_of_tags) { + $nr_of_tags = sizeof($tags); + } + + $rndtags = array_rand($tags, $nr_of_tags); + + $tags_id_csv_with_apos = "'"; + foreach($rndtags as $tagid) { + $tags_id_csv_with_apos .= $tags[$tagid]->id . "','"; + } + $tags_id_csv_with_apos = substr($tags_id_csv_with_apos,0,-2); + + + $query = " + SELECT + tg.id, tg.name, COUNT(ti.id) AS count, tg.flag + FROM + {$CFG->prefix}tag_instance ti + INNER JOIN + {$CFG->prefix}tag tg + ON + tg.id = ti.tagid + WHERE + ti.tagid + IN + ({$tags_id_csv_with_apos}) + GROUP BY + tagid + ORDER BY + count + ASC"; + + return get_records_sql($query); + + + } + + /*-------------------- Printing functions -------------------- */ + + /** + * Prints a box that contains the management links of a tag + * + * @param $tag_object + */ + + function print_tag_management_box($tag_object) { + + global $USER, $CFG; + + $tagname = /*ucwords*/($tag_object->name); + + print_box_start('box','tag-management-box'); + + $systemcontext = get_context_instance(CONTEXT_SYSTEM); + + $addtaglink = ''; + if ( has_capability('moodle/tag:managetags',$systemcontext) ) { + $manage_link = "wwwroot}/tag/manage.php\">" . get_string('managetags', 'tag') . "" ; + echo $manage_link .' | '; + } + + // if the user is not tagged with the $tag_object tag, a link "add blahblah to my interests" will appear + if( !is_item_tagged_with('user', $USER->id, $tag_object->id )) { + $addtaglink = ''; + $addtaglink .= get_string('addtagtomyinterests','tag',$tagname). ''; + echo $addtaglink .' | '; + } + + // only people with moodle/tag:edittags capability may edit the tag description + if ( has_capability('moodle/tag:edittags',$systemcontext) && is_item_tagged_with('user', $USER->id, $tag_object->id ) ) { + echo ' Edit this tag | '; + } + + // flag as inappropriate link + $flagtaglink = ''; + $flagtaglink .= get_string('flagasinappropriate','tag',$tagname). ''; + echo $flagtaglink; + + print_box_end(); + + } + + /** + * Prints a box with the description of a tag and its related tags + * + * @param unknown_type $tag_object + */ + + function print_tag_description_box($tag_object) { + + global $USER, $CFG; + + $tagname = /*ucwords*/($tag_object->name); + $related_tags = related_tags($tag_object->id); //get_item_tags('tags',$tag_object->id); + + + print_box_start('generalbox', 'tag-description'); + + if (!empty($tag_object->description)) { + echo format_text($tag_object->description, $tag_object->descriptionformat ); + } + else { + echo format_text(get_string('thistaghasnodesc','tag')); + } + + + if ($related_tags) { + echo '
'.get_string('relatedtags','tag').': ' . tag_links_csv($related_tags); + } + + print_box_end(); + } + + /** + * Prints a table of the users tagged with the tag passed as argument + * + * @param $tag_object + * @param int $users_per_row number of users per row to display + * @param int $limitfrom prints users starting at this point (optional, required if $limitnum is set). + * @param int $limitnum prints this many users (optional, required if $limitfrom is set). + */ + + function print_tagged_users_table($tag_object, $users_per_row='5', $limitfrom='' , $limitnum='') { + + //List of users with this tag + $userlist = array_values( get_items_tagged_with( + 'user', + $tag_object->id, + 'lastaccess DESC' , + 'id, firstname, lastname, picture', + $limitfrom, + $limitnum) ); + + //user table box + print_box_start('generalbox', 'tag-user-table'); + + print_user_table($userlist, $users_per_row); + + print_box_end(); + //end table box + + + + } + + /** + * Prints a table of users + * + * @param array $userlist an array of user objects + * @param int $users_per_row number of users per row to display + */ + function print_user_table($userlist, $users_per_row='5') { + + $nrofrows = ceil( count($userlist) / $users_per_row ); + for($row = 0; $row < $nrofrows; $row++){ + + //table row box + print_box_start('user-table-row', 'row_'.$row); + + for($col = 0; ($col < $users_per_row) ; $col++ ) { + + $index = $row * $users_per_row + $col; + + if ($index < count($userlist) ) { + + print_user_box( $userlist[$index] ); + + } + + } + + print_box_end(); + //end table row box + + } + + } + + /** + * Prints an individual user box + * + * @param $user user object (contains the following fields: id, firstname, lastname and picture) + */ + function print_user_box($user) { + + global $CFG; + + $usercontext = get_context_instance(CONTEXT_USER, $user->id); + + $profilelink = ''; + if ( has_capability('moodle/user:viewdetails', $usercontext) ) { + $profilelink = $CFG->wwwroot.'/user/view.php?id='.$user->id; + } + + print_box_start('user-box', $user->id); + + if (!empty($profilelink)) echo ''; + + //print user image + if ($user->picture) { + echo '
';
+ }
+ else {
+ echo '
';
+ }
+
+ echo ''; + + if (!empty($profilelink)) echo ''; + + $fullname = fullname($user); + //truncate name if it's too big + if (strlen($fullname) > 26) $fullname = substr($fullname,0,26) . '...'; + + echo '' . $fullname . ''; + + print_box_end(); + + } + + /** + * Prints the tag search box + * + */ + function print_tag_search_box() { + + global $CFG; + + print_box_start('','tag-search-box'); + + echo ''; + + print_box_end(); + } + + /** + * Prints the tag search results + * + * @param string $query text that tag names will be matched against + * @param int $page current page + * @param int $perpage nr of users displayed per page + */ + function print_tag_search_results($query, $page, $perpage) { + + global $CFG, $USER; + + $count = sizeof( search_tags($query,false) ); + $tags = array_values(search_tags($query, true, $page * $perpage , $perpage)); + + $baseurl = $CFG->wwwroot.'/tag/search.php?query=' . $query; + + // link "Add $query to my interests" + $addtaglink = ''; + if( !is_item_tagged_with('user', $USER->id, $query )) { + $addtaglink = ''; + $addtaglink .= get_string('addtagtomyinterests','tag',$query). ''; + } + + + if($tags) { // there are results to display!! + + print_heading(get_string('searchresultsfor', 'tag') . " \"{$query}\" : {$count}", '', 3); + + //print a link "Add $query to my interests" + if (!empty($addtaglink)) { + print_box($addtaglink,'box','tag-management-box'); + } + + $nr_of_lis_per_ul = 6; + $nr_of_uls = ceil( sizeof($tags) / $nr_of_lis_per_ul); + + echo '
- ';
+ for($i = 0; $i < $nr_of_uls; $i++) {
+ echo '
- ';
+ foreach (array_slice($tags, $i * $nr_of_lis_per_ul, $nr_of_lis_per_ul ) as $tag) {
+ $tag_link = ' '.$tag->name.'';
+ echo '•' . $tag_link . '
'; + } + echo ' ';
+ }
+ echo '
- ';
+ foreach ($tagcloud as $key => $tag) {
+
+ $size = $min_size + ((log10($tag->count) - $min) * $step);
+ $size = ceil($size);
+
+ $style = 'style="font-size: '.$size.'%"';
+ $title = 'title="'.$tag->count . ' ' .get_string('thingstaggedwith','tag') . ' ' . $tag->name.'"';
+ $href = 'href="'.$CFG->wwwroot.'/tag/index.php?id='.$tag->id.'"';
+
+ //highlight tags that have been flagged as inappropriate for those who can manage them
+ $tagname = $tag->name;
+ if ($tag->flag > 0 && $can_manage_tags) {
+ $tagname = '' . $tag->name . '';
+ }
+
+ $tag_link = '
- '.$tagname.' '; + + echo $tag_link; + + } + echo '