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<?php
/**
* @link http://www.yiiframework.com/
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* @copyright Copyright (c) 2008 Yii Software LLC
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* @license http://www.yiiframework.com/license/
*/
namespace yii\data;
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use Yii;
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use yii\base\InvalidConfigException;
use yii\base\Object;
use yii\helpers\Html;
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use yii\helpers\Inflector;
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/**
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* Sort represents information relevant to sorting.
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*
* When data needs to be sorted according to one or several attributes,
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* we can use Sort to represent the sorting information and generate
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* appropriate hyperlinks that can lead to sort actions.
*
* A typical usage example is as follows,
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*
* ~~~
* function actionIndex()
* {
* $sort = new Sort(array(
* 'attributes' => array(
* 'age',
* 'name' => array(
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* 'asc' => array('first_name' => Sort::ASC, 'last_name' => Sort::ASC),
* 'desc' => array('first_name' => Sort::DESC, 'last_name' => Sort::DESC),
* 'default' => Sort::DESC,
* 'label' => 'Name',
* ),
* ),
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* ));
*
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* $models = Article::find()
* ->where(array('status' => 1))
* ->orderBy($sort->orders)
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* ->all();
*
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* return $this->render('index', array(
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* 'models' => $models,
* 'sort' => $sort,
* ));
* }
* ~~~
*
* View:
*
* ~~~
* // display links leading to sort actions
* echo $sort->link('name', 'Name') . ' | ' . $sort->link('age', 'Age');
*
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* foreach ($models as $model) {
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* // display $model here
* }
* ~~~
*
* In the above, we declare two [[attributes]] that support sorting: name and age.
* We pass the sort information to the Article query so that the query results are
* sorted by the orders specified by the Sort object. In the view, we show two hyperlinks
* that can lead to pages with the data sorted by the corresponding attributes.
*
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* @author Qiang Xue <qiang.xue@gmail.com>
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* @since 2.0
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*/
class Sort extends Object
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{
/**
* Sort ascending
*/
const ASC = false;
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/**
* Sort descending
*/
const DESC = true;
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/**
* @var boolean whether the sorting can be applied to multiple attributes simultaneously.
* Defaults to false, which means each time the data can only be sorted by one attribute.
*/
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public $enableMultiSort = false;
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/**
* @var array list of attributes that are allowed to be sorted. Its syntax can be
* described using the following example:
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*
* ~~~
* array(
* 'age',
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* 'name' => array(
* 'asc' => array('first_name' => Sort::ASC, 'last_name' => Sort::ASC),
* 'desc' => array('first_name' => Sort::DESC, 'last_name' => Sort::DESC),
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* 'default' => Sort::DESC,
* 'label' => 'Name',
* ),
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* )
* ~~~
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*
* In the above, two attributes are declared: "age" and "user". The "age" attribute is
* a simple attribute which is equivalent to the following:
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*
* ~~~
* 'age' => array(
* 'asc' => array('age' => Sort::ASC),
* 'desc' => array('age' => Sort::DESC),
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* 'default' => Sort::ASC,
* 'label' => Inflector::camel2words('age'),
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* )
* ~~~
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*
* The "user" attribute is a composite attribute:
*
* - The "user" key represents the attribute name which will appear in the URLs leading
* to sort actions. Attribute names cannot contain characters listed in [[separators]].
* - The "asc" and "desc" elements specify how to sort by the attribute in ascending
* and descending orders, respectively. Their values represent the actual columns and
* the directions by which the data should be sorted by.
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* - The "default" element specifies by which direction the attribute should be sorted
* if it is not currently sorted (the default value is ascending order).
* - The "label" element specifies what label should be used when calling [[link()]] to create
* a sort link. If not set, [[Inflector::camel2words()]] will be called to get a label.
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*
* Note that if the Sort object is already created, you can only use the full format
* to configure every attribute. Each attribute must include these elements: asc, desc and label.
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*/
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public $attributes = array();
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/**
* @var string the name of the parameter that specifies which attributes to be sorted
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* in which direction. Defaults to 'sort'.
* @see params
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*/
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public $sortVar = 'sort';
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/**
* @var string the tag appeared in the [[sortVar]] parameter that indicates the attribute should be sorted
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* in descending order. Defaults to 'desc'.
*/
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public $descTag = 'desc';
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/**
* @var array the order that should be used when the current request does not specify any order.
* The array keys are attribute names and the array values are the corresponding sort directions. For example,
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*
* ~~~
* array(
* 'name' => Sort::ASC,
* 'create_time' => Sort::DESC,
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* )
* ~~~
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*
* @see attributeOrders
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*/
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public $defaultOrder;
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/**
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* @var string the route of the controller action for displaying the sorted contents.
* If not set, it means using the currently requested route.
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*/
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public $route;
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/**
* @var array separators used in the generated URL. This must be an array consisting of
* two elements. The first element specifies the character separating different
* attributes, while the second element specifies the character separating attribute name
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* and the corresponding sort direction. Defaults to `array('.', '-')`.
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*/
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public $separators = array('.', '-');
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/**
* @var array parameters (name => value) that should be used to obtain the current sort directions
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* and to create new sort URLs. If not set, $_GET will be used instead.
*
* The array element indexed by [[sortVar]] is considered to be the current sort directions.
* If the element does not exist, the [[defaults|default order]] will be used.
*
* @see sortVar
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* @see defaultOrder
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*/
public $params;
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/**
* @var \yii\web\UrlManager the URL manager used for creating sort URLs. If not set,
* the "urlManager" application component will be used.
*/
public $urlManager;
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/**
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* Normalizes the [[attributes]] property.
*/
public function init()
{
$attributes = array();
foreach ($this->attributes as $name => $attribute) {
if (is_array($attribute)) {
$attributes[$name] = $attribute;
if (!isset($attribute['label'])) {
$attributes[$name]['label'] = Inflector::camel2words($name);
}
} else {
$attributes[$attribute] = array(
'asc' => array($attribute => self::ASC),
'desc' => array($attribute => self::DESC),
'label' => Inflector::camel2words($attribute),
);
}
}
$this->attributes = $attributes;
}
/**
* Returns the columns and their corresponding sort directions.
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* @param boolean $recalculate whether to recalculate the sort directions
* @return array the columns (keys) and their corresponding sort directions (values).
* This can be passed to [[\yii\db\Query::orderBy()]] to construct a DB query.
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*/
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public function getOrders($recalculate = false)
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{
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$attributeOrders = $this->getAttributeOrders($recalculate);
$orders = array();
foreach ($attributeOrders as $attribute => $direction) {
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$definition = $this->attributes[$attribute];
$columns = $definition[$direction === self::ASC ? 'asc' : 'desc'];
foreach ($columns as $name => $dir) {
$orders[$name] = $dir;
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}
}
return $orders;
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}
private $_attributeOrders;
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/**
* Returns the currently requested sort information.
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* @param boolean $recalculate whether to recalculate the sort directions
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* @return array sort directions indexed by attribute names.
* Sort direction can be either [[Sort::ASC]] for ascending order or
* [[Sort::DESC]] for descending order.
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*/
public function getAttributeOrders($recalculate = false)
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{
if ($this->_attributeOrders === null || $recalculate) {
$this->_attributeOrders = array();
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$params = $this->params === null ? $_GET : $this->params;
if (isset($params[$this->sortVar]) && is_scalar($params[$this->sortVar])) {
$attributes = explode($this->separators[0], $params[$this->sortVar]);
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foreach ($attributes as $attribute) {
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$descending = false;
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if (($pos = strrpos($attribute, $this->separators[1])) !== false) {
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if ($descending = (substr($attribute, $pos + 1) === $this->descTag)) {
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$attribute = substr($attribute, 0, $pos);
}
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}
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if (isset($this->attributes[$attribute])) {
$this->_attributeOrders[$attribute] = $descending;
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if (!$this->enableMultiSort) {
return $this->_attributeOrders;
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}
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}
}
}
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if (empty($this->_attributeOrders) && is_array($this->defaultOrder)) {
$this->_attributeOrders = $this->defaultOrder;
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}
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}
return $this->_attributeOrders;
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}
/**
* Returns the sort direction of the specified attribute in the current request.
* @param string $attribute the attribute name
* @return boolean|null Sort direction of the attribute. Can be either [[Sort::ASC]]
* for ascending order or [[Sort::DESC]] for descending order. Null is returned
* if the attribute is invalid or does not need to be sorted.
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*/
public function getAttributeOrder($attribute)
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{
$this->getAttributeOrders();
return isset($this->_attributeOrders[$attribute]) ? $this->_attributeOrders[$attribute] : null;
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}
/**
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* Generates a hyperlink that links to the sort action to sort by the specified attribute.
* Based on the sort direction, the CSS class of the generated hyperlink will be appended
* with "asc" or "desc".
* @param string $attribute the attribute name by which the data should be sorted by.
* @param array $options additional HTML attributes for the hyperlink tag
* @return string the generated hyperlink
* @throws InvalidConfigException if the attribute is unknown
*/
public function link($attribute, $options = array())
{
if (($direction = $this->getAttributeOrder($attribute)) !== null) {
$class = $direction ? 'desc' : 'asc';
if (isset($options['class'])) {
$options['class'] .= ' ' . $class;
} else {
$options['class'] = $class;
}
}
$url = $this->createUrl($attribute);
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$definition = $this->attributes[$attribute];
return Html::a($definition['label'], $url, $options);
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}
/**
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* Creates a URL for sorting the data by the specified attribute.
* This method will consider the current sorting status given by [[attributeOrders]].
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* For example, if the current page already sorts the data by the specified attribute in ascending order,
* then the URL created will lead to a page that sorts the data by the specified attribute in descending order.
* @param string $attribute the attribute name
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* @return string the URL for sorting. False if the attribute is invalid.
* @throws InvalidConfigException if the attribute is unknown
* @see attributeOrders
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* @see params
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*/
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public function createUrl($attribute)
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{
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if (!isset($this->attributes[$attribute])) {
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throw new InvalidConfigException("Unknown attribute: $attribute");
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}
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$definition = $this->attributes[$attribute];
$directions = $this->getAttributeOrders();
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if (isset($directions[$attribute])) {
$descending = !$directions[$attribute];
unset($directions[$attribute]);
} else {
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$descending = !empty($definition['default']);
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}
if ($this->enableMultiSort) {
$directions = array_merge(array($attribute => $descending), $directions);
} else {
$directions = array($attribute => $descending);
}
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$sorts = array();
foreach ($directions as $attribute => $descending) {
$sorts[] = $descending ? $attribute . $this->separators[1] . $this->descTag : $attribute;
}
$params = $this->params === null ? $_GET : $this->params;
$params[$this->sortVar] = implode($this->separators[0], $sorts);
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$route = $this->route === null ? Yii::$app->controller->getRoute() : $this->route;
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$urlManager = $this->urlManager === null ? Yii::$app->getUrlManager() : $this->urlManager;
return $urlManager->createUrl($route, $params);
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}
}