diff core/lib/Drupal/Core/Template/Attribute.php @ 0:4c8ae668cc8c

Initial import (non-working)

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/core/lib/Drupal/Core/Template/Attribute.php	Wed Nov 29 16:09:58 2017 +0000
@@ -0,0 +1,345 @@
+<?php
+
+namespace Drupal\Core\Template;
+
+use Drupal\Component\Render\PlainTextOutput;
+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(&quot;xss&quot;);">
+ * @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 &lt;em&gt; 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 = [];
+
+  /**
+   * 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 = []) {
+    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, $value);
+    }
+    // As a development aid, we allow the value to be a safe string object.
+    elseif ($value instanceof MarkupInterface) {
+      // 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) {
+      $classes = [];
+      foreach ($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();
+      $classes = [];
+      foreach ($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;
+  }
+
+}