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<?php | |
/** | |
* @file | |
* Contains \Drupal\Core\Template\Attribute. | |
*/ | |
namespace Drupal\Core\Template; | |
use Drupal\Component\Render\PlainTextOutput; | |
use Drupal\Component\Utility\SafeMarkup; | |
use Drupal\Component\Render\MarkupInterface; | |
/** | |
* Collects, sanitizes, and renders HTML attributes. | |
* | |
* To use, optionally pass in an associative array of defined attributes, or | |
* add attributes using array syntax. For example: | |
* @code | |
* $attributes = new Attribute(array('id' => 'socks')); | |
* $attributes['class'] = array('black-cat', 'white-cat'); | |
* $attributes['class'][] = 'black-white-cat'; | |
* echo '<cat' . $attributes . '>'; | |
* // Produces <cat id="socks" class="black-cat white-cat black-white-cat"> | |
* @endcode | |
* | |
* $attributes always prints out all the attributes. For example: | |
* @code | |
* $attributes = new Attribute(array('id' => 'socks')); | |
* $attributes['class'] = array('black-cat', 'white-cat'); | |
* $attributes['class'][] = 'black-white-cat'; | |
* echo '<cat class="cat ' . $attributes['class'] . '"' . $attributes . '>'; | |
* // Produces <cat class="cat black-cat white-cat black-white-cat" id="socks" class="cat black-cat white-cat black-white-cat"> | |
* @endcode | |
* | |
* When printing out individual attributes to customize them within a Twig | |
* template, use the "without" filter to prevent attributes that have already | |
* been printed from being printed again. For example: | |
* @code | |
* <cat class="{{ attributes.class }} my-custom-class"{{ attributes|without('class') }}> | |
* {# Produces <cat class="cat black-cat white-cat black-white-cat my-custom-class" id="socks"> #} | |
* @endcode | |
* | |
* The attribute keys and values are automatically escaped for output with | |
* Html::escape(). No protocol filtering is applied, so when using user-entered | |
* input as a value for an attribute that expects an URI (href, src, ...), | |
* UrlHelper::stripDangerousProtocols() should be used to ensure dangerous | |
* protocols (such as 'javascript:') are removed. For example: | |
* @code | |
* $path = 'javascript:alert("xss");'; | |
* $path = UrlHelper::stripDangerousProtocols($path); | |
* $attributes = new Attribute(array('href' => $path)); | |
* echo '<a' . $attributes . '>'; | |
* // Produces <a href="alert("xss");"> | |
* @endcode | |
* | |
* The attribute values are considered plain text and are treated as such. If a | |
* safe HTML string is detected, it is converted to plain text with | |
* PlainTextOutput::renderFromHtml() before being escaped. For example: | |
* @code | |
* $value = t('Highlight the @tag tag', ['@tag' => '<em>']); | |
* $attributes = new Attribute(['value' => $value]); | |
* echo '<input' . $attributes . '>'; | |
* // Produces <input value="Highlight the <em> tag"> | |
* @endcode | |
* | |
* @see \Drupal\Component\Utility\Html::escape() | |
* @see \Drupal\Component\Render\PlainTextOutput::renderFromHtml() | |
* @see \Drupal\Component\Utility\UrlHelper::stripDangerousProtocols() | |
*/ | |
class Attribute implements \ArrayAccess, \IteratorAggregate, MarkupInterface { | |
/** | |
* Stores the attribute data. | |
* | |
* @var \Drupal\Core\Template\AttributeValueBase[] | |
*/ | |
protected $storage = array(); | |
/** | |
* Constructs a \Drupal\Core\Template\Attribute object. | |
* | |
* @param array $attributes | |
* An associative array of key-value pairs to be converted to attributes. | |
*/ | |
public function __construct($attributes = array()) { | |
foreach ($attributes as $name => $value) { | |
$this->offsetSet($name, $value); | |
} | |
} | |
/** | |
* {@inheritdoc} | |
*/ | |
public function offsetGet($name) { | |
if (isset($this->storage[$name])) { | |
return $this->storage[$name]; | |
} | |
} | |
/** | |
* {@inheritdoc} | |
*/ | |
public function offsetSet($name, $value) { | |
$this->storage[$name] = $this->createAttributeValue($name, $value); | |
} | |
/** | |
* Creates the different types of attribute values. | |
* | |
* @param string $name | |
* The attribute name. | |
* @param mixed $value | |
* The attribute value. | |
* | |
* @return \Drupal\Core\Template\AttributeValueBase | |
* An AttributeValueBase representation of the attribute's value. | |
*/ | |
protected function createAttributeValue($name, $value) { | |
// If the value is already an AttributeValueBase object, | |
// return a new instance of the same class, but with the new name. | |
if ($value instanceof AttributeValueBase) { | |
$class = get_class($value); | |
return new $class($name, $value->value()); | |
} | |
// An array value or 'class' attribute name are forced to always be an | |
// AttributeArray value for consistency. | |
if ($name == 'class' && !is_array($value)) { | |
// Cast the value to string in case it implements MarkupInterface. | |
$value = [(string) $value]; | |
} | |
if (is_array($value)) { | |
// Cast the value to an array if the value was passed in as a string. | |
// @todo Decide to fix all the broken instances of class as a string | |
// in core or cast them. | |
$value = new AttributeArray($name, $value); | |
} | |
elseif (is_bool($value)) { | |
$value = new AttributeBoolean($name, $value); | |
} | |
// As a development aid, we allow the value to be a safe string object. | |
elseif (SafeMarkup::isSafe($value)) { | |
// Attributes are not supposed to display HTML markup, so we just convert | |
// the value to plain text. | |
$value = PlainTextOutput::renderFromHtml($value); | |
$value = new AttributeString($name, $value); | |
} | |
elseif (!is_object($value)) { | |
$value = new AttributeString($name, $value); | |
} | |
return $value; | |
} | |
/** | |
* {@inheritdoc} | |
*/ | |
public function offsetUnset($name) { | |
unset($this->storage[$name]); | |
} | |
/** | |
* {@inheritdoc} | |
*/ | |
public function offsetExists($name) { | |
return isset($this->storage[$name]); | |
} | |
/** | |
* Adds classes or merges them on to array of existing CSS classes. | |
* | |
* @param string|array ... | |
* CSS classes to add to the class attribute array. | |
* | |
* @return $this | |
*/ | |
public function addClass() { | |
$args = func_get_args(); | |
if ($args) { | |
$classes = array(); | |
foreach ($args as $arg) { | |
// Merge the values passed in from the classes array. | |
// The argument is cast to an array to support comma separated single | |
// values or one or more array arguments. | |
$classes = array_merge($classes, (array) $arg); | |
} | |
// Merge if there are values, just add them otherwise. | |
if (isset($this->storage['class']) && $this->storage['class'] instanceof AttributeArray) { | |
// Merge the values passed in from the class value array. | |
$classes = array_merge($this->storage['class']->value(), $classes); | |
$this->storage['class']->exchangeArray($classes); | |
} | |
else { | |
$this->offsetSet('class', $classes); | |
} | |
} | |
return $this; | |
} | |
/** | |
* Sets values for an attribute key. | |
* | |
* @param string $attribute | |
* Name of the attribute. | |
* @param string|array $value | |
* Value(s) to set for the given attribute key. | |
* | |
* @return $this | |
*/ | |
public function setAttribute($attribute, $value) { | |
$this->offsetSet($attribute, $value); | |
return $this; | |
} | |
/** | |
* Removes an attribute from an Attribute object. | |
* | |
* @param string|array ... | |
* Attributes to remove from the attribute array. | |
* | |
* @return $this | |
*/ | |
public function removeAttribute() { | |
$args = func_get_args(); | |
foreach ($args as $arg) { | |
// Support arrays or multiple arguments. | |
if (is_array($arg)) { | |
foreach ($arg as $value) { | |
unset($this->storage[$value]); | |
} | |
} | |
else { | |
unset($this->storage[$arg]); | |
} | |
} | |
return $this; | |
} | |
/** | |
* Removes argument values from array of existing CSS classes. | |
* | |
* @param string|array ... | |
* CSS classes to remove from the class attribute array. | |
* | |
* @return $this | |
*/ | |
public function removeClass() { | |
// With no class attribute, there is no need to remove. | |
if (isset($this->storage['class']) && $this->storage['class'] instanceof AttributeArray) { | |
$args = func_get_args(); | |
$classes = array(); | |
foreach ($args as $arg) { | |
// Merge the values passed in from the classes array. | |
// The argument is cast to an array to support comma separated single | |
// values or one or more array arguments. | |
$classes = array_merge($classes, (array) $arg); | |
} | |
// Remove the values passed in from the value array. Use array_values() to | |
// ensure that the array index remains sequential. | |
$classes = array_values(array_diff($this->storage['class']->value(), $classes)); | |
$this->storage['class']->exchangeArray($classes); | |
} | |
return $this; | |
} | |
/** | |
* Checks if the class array has the given CSS class. | |
* | |
* @param string $class | |
* The CSS class to check for. | |
* | |
* @return bool | |
* Returns TRUE if the class exists, or FALSE otherwise. | |
*/ | |
public function hasClass($class) { | |
if (isset($this->storage['class']) && $this->storage['class'] instanceof AttributeArray) { | |
return in_array($class, $this->storage['class']->value()); | |
} | |
else { | |
return FALSE; | |
} | |
} | |
/** | |
* Implements the magic __toString() method. | |
*/ | |
public function __toString() { | |
$return = ''; | |
/** @var \Drupal\Core\Template\AttributeValueBase $value */ | |
foreach ($this->storage as $name => $value) { | |
$rendered = $value->render(); | |
if ($rendered) { | |
$return .= ' ' . $rendered; | |
} | |
} | |
return $return; | |
} | |
/** | |
* Returns all storage elements as an array. | |
* | |
* @return array | |
* An associative array of attributes. | |
*/ | |
public function toArray() { | |
$return = []; | |
foreach ($this->storage as $name => $value) { | |
$return[$name] = $value->value(); | |
} | |
return $return; | |
} | |
/** | |
* Implements the magic __clone() method. | |
*/ | |
public function __clone() { | |
foreach ($this->storage as $name => $value) { | |
$this->storage[$name] = clone $value; | |
} | |
} | |
/** | |
* {@inheritdoc} | |
*/ | |
public function getIterator() { | |
return new \ArrayIterator($this->storage); | |
} | |
/** | |
* Returns the whole array. | |
*/ | |
public function storage() { | |
return $this->storage; | |
} | |
/** | |
* Returns a representation of the object for use in JSON serialization. | |
* | |
* @return string | |
* The safe string content. | |
*/ | |
public function jsonSerialize() { | |
return (string) $this; | |
} | |
} |