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Current File : /srv/wp/ciieduconnect.in/www/core/lib/Drupal/Component/Render/FormattableMarkup.php
<?php

namespace Drupal\Component\Render;

use Drupal\Component\Utility\Html;
use Drupal\Component\Utility\UrlHelper;

/**
 * Formats a string for HTML display by replacing variable placeholders.
 *
 * When cast to a string, this object replaces variable placeholders in the
 * string with the arguments passed in during construction and escapes the
 * values so they can be safely displayed as HTML. See the documentation of
 * \Drupal\Component\Render\FormattableMarkup::placeholderFormat() for details
 * on the supported placeholders and how to use them securely. Incorrect use of
 * this class can result in security vulnerabilities.
 *
 * In most cases, you should use TranslatableMarkup or PluralTranslatableMarkup
 * rather than this object, since they will translate the text (on
 * non-English-only sites) in addition to formatting it. Variables concatenated
 * without the insertion of language-specific words or punctuation are some
 * examples where translation is not applicable and using this class directly
 * is appropriate.
 *
 * This class is designed for formatting messages that are mostly text, not as
 * an HTML template language. As such:
 * - The passed in string should contain no (or minimal) HTML.
 * - Variable placeholders should not be used within the "<" and ">" of an
 *   HTML tag, such as in HTML attribute values. This would be a security
 *   risk. Examples:
 *   @code
 *     // Insecure (placeholder within "<" and ">"):
 *     $this->placeholderFormat('<@variable>text</@variable>', ['@variable' => $variable]);
 *     // Insecure (placeholder within "<" and ">"):
 *     $this->placeholderFormat('<a @variable>link text</a>', ['@variable' => $variable]);
 *     // Insecure (placeholder within "<" and ">"):
 *     $this->placeholderFormat('<a title="@variable">link text</a>', ['@variable' => $variable]);
 *   @endcode
 *   Only the "href" attribute is supported via the special ":variable"
 *   placeholder, to allow simple links to be inserted:
 *   @code
 *     // Secure (usage of ":variable" placeholder for href attribute):
 *     $this->placeholderFormat('<a href=":variable">link text</a>', [':variable' , $variable]);
 *     // Secure (usage of ":variable" placeholder for href attribute):
 *     $this->placeholderFormat('<a href=":variable" title="static text">link text</a>', [':variable' => $variable]);
 *     // Insecure (the "@variable" placeholder does not filter dangerous
 *     // protocols):
 *     $this->placeholderFormat('<a href="@variable">link text</a>', ['@variable' => $variable]);
 *     // Insecure ("@variable" placeholder within "<" and ">"):
 *     $this->placeholderFormat('<a href=":url" title="@variable">link text</a>', [':url' => $url, '@variable' => $variable]);
 *   @endcode
 * To build non-minimal HTML, use an HTML template language such as Twig,
 * rather than this class.
 *
 * @ingroup sanitization
 *
 * @see \Drupal\Core\StringTranslation\TranslatableMarkup
 * @see \Drupal\Core\StringTranslation\PluralTranslatableMarkup
 * @see \Drupal\Component\Render\FormattableMarkup::placeholderFormat()
 */
class FormattableMarkup implements MarkupInterface, \Countable {

  /**
   * The string containing placeholders.
   *
   * @var string
   */
  protected $string;

  /**
   * The arguments to replace placeholders with.
   *
   * @var array
   */
  protected $arguments = [];

  /**
   * Constructs a new class instance.
   *
   * @param string $string
   *   A string containing placeholders. The string itself will not be escaped,
   *   any unsafe content must be in $args and inserted via placeholders.
   * @param array $arguments
   *   An array with placeholder replacements, keyed by placeholder. See
   *   \Drupal\Component\Render\FormattableMarkup::placeholderFormat() for
   *   additional information about placeholders.
   *
   * @see \Drupal\Component\Render\FormattableMarkup::placeholderFormat()
   */
  public function __construct($string, array $arguments) {
    $this->string = (string) $string;
    $this->arguments = $arguments;
  }

  /**
   * {@inheritdoc}
   */
  public function __toString() {
    return static::placeholderFormat($this->string, $this->arguments);
  }

  /**
   * Returns the string length.
   *
   * @return int
   *   The length of the string.
   */
  #[\ReturnTypeWillChange]
  public function count() {
    return mb_strlen($this->string);
  }

  /**
   * Returns a representation of the object for use in JSON serialization.
   *
   * @return string
   *   The safe string content.
   */
  #[\ReturnTypeWillChange]
  public function jsonSerialize() {
    return $this->__toString();
  }

  /**
   * Replaces placeholders in a string with values.
   *
   * @param string $string
   *   A string containing placeholders. The string itself is expected to be
   *   safe and correct HTML. Any unsafe content must be in $args and
   *   inserted via placeholders.
   * @param array $args
   *   An associative array of replacements. Each array key should be the same
   *   as a placeholder in $string. The corresponding value should be a string
   *   or an object that implements \Drupal\Component\Render\MarkupInterface.
   *   Null args[] values are deprecated in Drupal 9.5 and will fail in
   *   Drupal 11.0. The value replaces the placeholder in $string. Sanitization
   *   and formatting will be done before replacement. The type of sanitization
   *   and formatting depends on the first character of the key:
   *   - @variable: When the placeholder replacement value is:
   *     - A string, the replaced value in the returned string will be sanitized
   *       using \Drupal\Component\Utility\Html::escape().
   *     - A MarkupInterface object, the replaced value in the returned string
   *       will not be sanitized.
   *     - A MarkupInterface object cast to a string, the replaced value in the
   *       returned string be forcibly sanitized using
   *       \Drupal\Component\Utility\Html::escape().
   *       @code
   *         $this->placeholderFormat('This will force HTML-escaping of the replacement value: @text', ['@text' => (string) $safe_string_interface_object));
   *       @endcode
   *     Use this placeholder as the default choice for anything displayed on
   *     the site, but not within HTML attributes, JavaScript, or CSS. Doing so
   *     is a security risk.
   *   - %variable: Use when the replacement value is to be wrapped in <em>
   *     tags.
   *     A call like:
   *     @code
   *       $string = "%output_text";
   *       $arguments = ['%output_text' => 'text output here.'];
   *       $this->placeholderFormat($string, $arguments);
   *     @endcode
   *     makes the following HTML code:
   *     @code
   *       <em class="placeholder">text output here.</em>
   *     @endcode
   *     As with @variable, do not use this within HTML attributes, JavaScript,
   *     or CSS. Doing so is a security risk.
   *   - :variable: Return value is escaped with
   *     \Drupal\Component\Utility\Html::escape() and filtered for dangerous
   *     protocols using UrlHelper::stripDangerousProtocols(). Use this when
   *     using the "href" attribute, ensuring the attribute value is always
   *     wrapped in quotes:
   *     @code
   *     // Secure (with quotes):
   *     $this->placeholderFormat('<a href=":url">@variable</a>', [':url' => $url, '@variable' => $variable]);
   *     // Insecure (without quotes):
   *     $this->placeholderFormat('<a href=:url>@variable</a>', [':url' => $url, '@variable' => $variable]);
   *     @endcode
   *     When ":variable" comes from arbitrary user input, the result is secure,
   *     but not guaranteed to be a valid URL (which means the resulting output
   *     could fail HTML validation). To guarantee a valid URL, use
   *     Url::fromUri($user_input)->toString() (which either throws an exception
   *     or returns a well-formed URL) before passing the result into a
   *     ":variable" placeholder.
   *
   * @return string
   *   A formatted HTML string with the placeholders replaced.
   *
   * @ingroup sanitization
   *
   * @see \Drupal\Core\StringTranslation\TranslatableMarkup
   * @see \Drupal\Core\StringTranslation\PluralTranslatableMarkup
   * @see \Drupal\Component\Utility\Html::escape()
   * @see \Drupal\Component\Utility\UrlHelper::stripDangerousProtocols()
   * @see \Drupal\Core\Url::fromUri()
   */
  protected static function placeholderFormat($string, array $args) {
    // Transform arguments before inserting them.
    foreach ($args as $key => $value) {
      if (is_null($value)) {
        // It's probably a bug to provide a null value for the placeholder arg,
        // and in D11 this will no longer be allowed. When this trigger_error
        // is removed, also remove isset $value checks inside the switch{}
        // below.
        @trigger_error(sprintf('Deprecated NULL placeholder value for key (%s) in: "%s". This will throw a PHP error in drupal:11.0.0. See https://www.drupal.org/node/3318826', (string) $key, (string) $string), E_USER_DEPRECATED);
        $value = '';
      }
      switch ($key[0]) {
        case '@':
          // Escape if the value is not an object from a class that implements
          // \Drupal\Component\Render\MarkupInterface, for example strings will
          // be escaped.
          // Strings that are safe within HTML fragments, but not within other
          // contexts, may still be an instance of
          // \Drupal\Component\Render\MarkupInterface, so this placeholder type
          // must not be used within HTML attributes, JavaScript, or CSS.
          $args[$key] = static::placeholderEscape($value);
          break;

        case ':':
          // Strip URL protocols that can be XSS vectors.
          $value = UrlHelper::stripDangerousProtocols($value);
          // Escape unconditionally, without checking whether the value is an
          // instance of \Drupal\Component\Render\MarkupInterface. This forces
          // characters that are unsafe for use in an "href" HTML attribute to
          // be encoded. If a caller wants to pass a value that is extracted
          // from HTML and therefore is already HTML encoded, it must invoke
          // \Drupal\Component\Render\OutputStrategyInterface::renderFromHtml()
          // on it prior to passing it in as a placeholder value of this type.
          // @todo Add some advice and stronger warnings.
          //   https://www.drupal.org/node/2569041.
          $args[$key] = Html::escape($value);
          break;

        case '%':
          // Similarly to @, escape non-safe values. Also, add wrapping markup
          // in order to render as a placeholder. Not for use within attributes,
          // per the warning above about
          // \Drupal\Component\Render\MarkupInterface and also due to the
          // wrapping markup.
          $args[$key] = '<em class="placeholder">' . static::placeholderEscape($value) . '</em>';
          break;

        default:
          // Deprecate support for random variables that won't be replaced.
          if (ctype_alpha($key[0]) && strpos($string, $key) === FALSE) {
            @trigger_error(sprintf('Support for keys without a placeholder prefix is deprecated in Drupal 9.1.0 and will be removed in Drupal 10.0.0. Invalid placeholder (%s) with string: "%s"', $key, $string), E_USER_DEPRECATED);
          }
          else {
            trigger_error(sprintf('Invalid placeholder (%s) with string: "%s"', $key, $string), E_USER_WARNING);
          }
          // No replacement possible therefore we can discard the argument.
          unset($args[$key]);
          break;
      }
    }

    return strtr($string, $args);
  }

  /**
   * Escapes a placeholder replacement value if needed.
   *
   * @param string|\Drupal\Component\Render\MarkupInterface $value
   *   A placeholder replacement value.
   *
   * @return string
   *   The properly escaped replacement value.
   */
  protected static function placeholderEscape($value) {
    return $value instanceof MarkupInterface ? (string) $value : Html::escape($value);
  }

}

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