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   1  <?php
   2  /**
   3   * Dependencies API: WP_Dependencies base class
   4   *
   5   * @since 2.6.0
   6   *
   7   * @package WordPress
   8   * @subpackage Dependencies
   9   */
  10  
  11  /**
  12   * Core base class extended to register items.
  13   *
  14   * @since 2.6.0
  15   *
  16   * @see _WP_Dependency
  17   */
  18  #[AllowDynamicProperties]
  19  class WP_Dependencies {
  20      /**
  21       * An array of all registered dependencies keyed by handle.
  22       *
  23       * @since 2.6.8
  24       *
  25       * @var _WP_Dependency[]
  26       */
  27      public $registered = array();
  28  
  29      /**
  30       * An array of handles of queued dependencies.
  31       *
  32       * @since 2.6.8
  33       *
  34       * @var string[]
  35       */
  36      public $queue = array();
  37  
  38      /**
  39       * An array of handles of dependencies to queue.
  40       *
  41       * @since 2.6.0
  42       *
  43       * @var string[]
  44       */
  45      public $to_do = array();
  46  
  47      /**
  48       * An array of handles of dependencies already queued.
  49       *
  50       * @since 2.6.0
  51       *
  52       * @var string[]
  53       */
  54      public $done = array();
  55  
  56      /**
  57       * An array of additional arguments passed when a handle is registered.
  58       *
  59       * Arguments are appended to the item query string.
  60       *
  61       * @since 2.6.0
  62       *
  63       * @var array
  64       */
  65      public $args = array();
  66  
  67      /**
  68       * An array of dependency groups to enqueue.
  69       *
  70       * Each entry is keyed by handle and represents the integer group level or boolean
  71       * false if the handle has no group.
  72       *
  73       * @since 2.8.0
  74       *
  75       * @var (int|false)[]
  76       */
  77      public $groups = array();
  78  
  79      /**
  80       * A handle group to enqueue.
  81       *
  82       * @since 2.8.0
  83       *
  84       * @deprecated 4.5.0
  85       * @var int
  86       */
  87      public $group = 0;
  88  
  89      /**
  90       * Cached lookup array of flattened queued items and dependencies.
  91       *
  92       * @since 5.4.0
  93       *
  94       * @var array
  95       */
  96      private $all_queued_deps;
  97  
  98      /**
  99       * List of assets enqueued before details were registered.
 100       *
 101       * @since 5.9.0
 102       *
 103       * @var array
 104       */
 105      private $queued_before_register = array();
 106  
 107      /**
 108       * Processes the items and dependencies.
 109       *
 110       * Processes the items passed to it or the queue, and their dependencies.
 111       *
 112       * @since 2.6.0
 113       * @since 2.8.0 Added the `$group` parameter.
 114       *
 115       * @param string|string[]|false $handles Optional. Items to be processed: queue (false),
 116       *                                       single item (string), or multiple items (array of strings).
 117       *                                       Default false.
 118       * @param int|false             $group   Optional. Group level: level (int), no group (false).
 119       * @return string[] Array of handles of items that have been processed.
 120       */
 121  	public function do_items( $handles = false, $group = false ) {
 122          /*
 123           * If nothing is passed, print the queue. If a string is passed,
 124           * print that item. If an array is passed, print those items.
 125           */
 126          $handles = false === $handles ? $this->queue : (array) $handles;
 127          $this->all_deps( $handles );
 128  
 129          foreach ( $this->to_do as $key => $handle ) {
 130              if ( ! in_array( $handle, $this->done, true ) && isset( $this->registered[ $handle ] ) ) {
 131                  /*
 132                   * Attempt to process the item. If successful,
 133                   * add the handle to the done array.
 134                   *
 135                   * Unset the item from the to_do array.
 136                   */
 137                  if ( $this->do_item( $handle, $group ) ) {
 138                      $this->done[] = $handle;
 139                  }
 140  
 141                  unset( $this->to_do[ $key ] );
 142              }
 143          }
 144  
 145          return $this->done;
 146      }
 147  
 148      /**
 149       * Processes a dependency.
 150       *
 151       * @since 2.6.0
 152       * @since 5.5.0 Added the `$group` parameter.
 153       *
 154       * @param string    $handle Name of the item. Should be unique.
 155       * @param int|false $group  Optional. Group level: level (int), no group (false).
 156       *                          Default false.
 157       * @return bool True on success, false if not set.
 158       */
 159  	public function do_item( $handle, $group = false ) {
 160          return isset( $this->registered[ $handle ] );
 161      }
 162  
 163      /**
 164       * Determines dependencies.
 165       *
 166       * Recursively builds an array of items to process taking
 167       * dependencies into account. Does NOT catch infinite loops.
 168       *
 169       * @since 2.1.0
 170       * @since 2.6.0 Moved from `WP_Scripts`.
 171       * @since 2.8.0 Added the `$group` parameter.
 172       *
 173       * @param string|string[] $handles   Item handle (string) or item handles (array of strings).
 174       * @param bool            $recursion Optional. Internal flag that function is calling itself.
 175       *                                   Default false.
 176       * @param int|false       $group     Optional. Group level: level (int), no group (false).
 177       *                                   Default false.
 178       * @return bool True on success, false on failure.
 179       */
 180  	public function all_deps( $handles, $recursion = false, $group = false ) {
 181          $handles = (array) $handles;
 182          if ( ! $handles ) {
 183              return false;
 184          }
 185  
 186          foreach ( $handles as $handle ) {
 187              $handle_parts = explode( '?', $handle );
 188              $handle       = $handle_parts[0];
 189              $queued       = in_array( $handle, $this->to_do, true );
 190  
 191              if ( in_array( $handle, $this->done, true ) ) { // Already done.
 192                  continue;
 193              }
 194  
 195              $moved     = $this->set_group( $handle, $recursion, $group );
 196              $new_group = $this->groups[ $handle ];
 197  
 198              if ( $queued && ! $moved ) { // Already queued and in the right group.
 199                  continue;
 200              }
 201  
 202              $keep_going = true;
 203              if ( ! isset( $this->registered[ $handle ] ) ) {
 204                  $keep_going = false; // Item doesn't exist.
 205              } elseif ( $this->registered[ $handle ]->deps && array_diff( $this->registered[ $handle ]->deps, array_keys( $this->registered ) ) ) {
 206                  $keep_going = false; // Item requires dependencies that don't exist.
 207              } elseif ( $this->registered[ $handle ]->deps && ! $this->all_deps( $this->registered[ $handle ]->deps, true, $new_group ) ) {
 208                  $keep_going = false; // Item requires dependencies that don't exist.
 209              }
 210  
 211              if ( ! $keep_going ) { // Either item or its dependencies don't exist.
 212                  if ( $recursion ) {
 213                      return false; // Abort this branch.
 214                  } else {
 215                      continue; // We're at the top level. Move on to the next one.
 216                  }
 217              }
 218  
 219              if ( $queued ) { // Already grabbed it and its dependencies.
 220                  continue;
 221              }
 222  
 223              if ( isset( $handle_parts[1] ) ) {
 224                  $this->args[ $handle ] = $handle_parts[1];
 225              }
 226  
 227              $this->to_do[] = $handle;
 228          }
 229  
 230          return true;
 231      }
 232  
 233      /**
 234       * Register an item.
 235       *
 236       * Registers the item if no item of that name already exists.
 237       *
 238       * @since 2.1.0
 239       * @since 2.6.0 Moved from `WP_Scripts`.
 240       *
 241       * @param string           $handle Name of the item. Should be unique.
 242       * @param string|false     $src    Full URL of the item, or path of the item relative
 243       *                                 to the WordPress root directory. If source is set to false,
 244       *                                 the item is an alias of other items it depends on.
 245       * @param string[]         $deps   Optional. An array of registered item handles this item depends on.
 246       *                                 Default empty array.
 247       * @param string|bool|null $ver    Optional. String specifying item version number, if it has one,
 248       *                                 which is added to the URL as a query string for cache busting purposes.
 249       *                                 If version is set to false, a version number is automatically added
 250       *                                 equal to current installed WordPress version.
 251       *                                 If set to null, no version is added.
 252       * @param mixed            $args   Optional. Custom property of the item. NOT the class property $args.
 253       *                                 Examples: $media, $in_footer.
 254       * @return bool Whether the item has been registered. True on success, false on failure.
 255       */
 256  	public function add( $handle, $src, $deps = array(), $ver = false, $args = null ) {
 257          if ( isset( $this->registered[ $handle ] ) ) {
 258              return false;
 259          }
 260          $this->registered[ $handle ] = new _WP_Dependency( $handle, $src, $deps, $ver, $args );
 261  
 262          // If the item was enqueued before the details were registered, enqueue it now.
 263          if ( array_key_exists( $handle, $this->queued_before_register ) ) {
 264              if ( ! is_null( $this->queued_before_register[ $handle ] ) ) {
 265                  $this->enqueue( $handle . '?' . $this->queued_before_register[ $handle ] );
 266              } else {
 267                  $this->enqueue( $handle );
 268              }
 269  
 270              unset( $this->queued_before_register[ $handle ] );
 271          }
 272  
 273          return true;
 274      }
 275  
 276      /**
 277       * Add extra item data.
 278       *
 279       * Adds data to a registered item.
 280       *
 281       * @since 2.6.0
 282       *
 283       * @param string $handle Name of the item. Should be unique.
 284       * @param string $key    The data key.
 285       * @param mixed  $value  The data value.
 286       * @return bool True on success, false on failure.
 287       */
 288  	public function add_data( $handle, $key, $value ) {
 289          if ( ! isset( $this->registered[ $handle ] ) ) {
 290              return false;
 291          }
 292          if ( 'conditional' === $key && '_required-conditional-dependency_' !== $value ) {
 293              _deprecated_argument(
 294                  'WP_Dependencies->add_data()',
 295                  '6.9.0',
 296                  __( 'IE conditional comments are ignored by all supported browsers.' )
 297              );
 298          }
 299  
 300          return $this->registered[ $handle ]->add_data( $key, $value );
 301      }
 302  
 303      /**
 304       * Get extra item data.
 305       *
 306       * Gets data associated with a registered item.
 307       *
 308       * @since 3.3.0
 309       *
 310       * @param string $handle Name of the item. Should be unique.
 311       * @param string $key    The data key.
 312       * @return mixed Extra item data (string), false otherwise.
 313       */
 314  	public function get_data( $handle, $key ) {
 315          if ( ! isset( $this->registered[ $handle ] ) ) {
 316              return false;
 317          }
 318  
 319          if ( ! isset( $this->registered[ $handle ]->extra[ $key ] ) ) {
 320              return false;
 321          }
 322  
 323          return $this->registered[ $handle ]->extra[ $key ];
 324      }
 325  
 326      /**
 327       * Un-register an item or items.
 328       *
 329       * @since 2.1.0
 330       * @since 2.6.0 Moved from `WP_Scripts`.
 331       *
 332       * @param string|string[] $handles Item handle (string) or item handles (array of strings).
 333       */
 334  	public function remove( $handles ) {
 335          foreach ( (array) $handles as $handle ) {
 336              unset( $this->registered[ $handle ] );
 337          }
 338      }
 339  
 340      /**
 341       * Queue an item or items.
 342       *
 343       * Decodes handles and arguments, then queues handles and stores
 344       * arguments in the class property $args. For example in extending
 345       * classes, $args is appended to the item url as a query string.
 346       * Note $args is NOT the $args property of items in the $registered array.
 347       *
 348       * @since 2.1.0
 349       * @since 2.6.0 Moved from `WP_Scripts`.
 350       *
 351       * @param string|string[] $handles Item handle (string) or item handles (array of strings).
 352       */
 353  	public function enqueue( $handles ) {
 354          foreach ( (array) $handles as $handle ) {
 355              $handle = explode( '?', $handle );
 356  
 357              if ( ! in_array( $handle[0], $this->queue, true ) && isset( $this->registered[ $handle[0] ] ) ) {
 358                  $this->queue[] = $handle[0];
 359  
 360                  // Reset all dependencies so they must be recalculated in recurse_deps().
 361                  $this->all_queued_deps = null;
 362  
 363                  if ( isset( $handle[1] ) ) {
 364                      $this->args[ $handle[0] ] = $handle[1];
 365                  }
 366              } elseif ( ! isset( $this->registered[ $handle[0] ] ) ) {
 367                  $this->queued_before_register[ $handle[0] ] = null; // $args
 368  
 369                  if ( isset( $handle[1] ) ) {
 370                      $this->queued_before_register[ $handle[0] ] = $handle[1];
 371                  }
 372              }
 373          }
 374      }
 375  
 376      /**
 377       * Dequeue an item or items.
 378       *
 379       * Decodes handles and arguments, then dequeues handles
 380       * and removes arguments from the class property $args.
 381       *
 382       * @since 2.1.0
 383       * @since 2.6.0 Moved from `WP_Scripts`.
 384       *
 385       * @param string|string[] $handles Item handle (string) or item handles (array of strings).
 386       */
 387  	public function dequeue( $handles ) {
 388          foreach ( (array) $handles as $handle ) {
 389              $handle = explode( '?', $handle );
 390              $key    = array_search( $handle[0], $this->queue, true );
 391  
 392              if ( false !== $key ) {
 393                  // Reset all dependencies so they must be recalculated in recurse_deps().
 394                  $this->all_queued_deps = null;
 395  
 396                  unset( $this->queue[ $key ] );
 397                  unset( $this->args[ $handle[0] ] );
 398              } elseif ( array_key_exists( $handle[0], $this->queued_before_register ) ) {
 399                  unset( $this->queued_before_register[ $handle[0] ] );
 400              }
 401          }
 402      }
 403  
 404      /**
 405       * Recursively search the passed dependency tree for a handle.
 406       *
 407       * @since 4.0.0
 408       *
 409       * @param string[] $queue  An array of queued _WP_Dependency handles.
 410       * @param string   $handle Name of the item. Should be unique.
 411       * @return bool Whether the handle is found after recursively searching the dependency tree.
 412       */
 413  	protected function recurse_deps( $queue, $handle ) {
 414          if ( isset( $this->all_queued_deps ) ) {
 415              return isset( $this->all_queued_deps[ $handle ] );
 416          }
 417  
 418          $all_deps = array_fill_keys( $queue, true );
 419          $queues   = array();
 420          $done     = array();
 421  
 422          while ( $queue ) {
 423              foreach ( $queue as $queued ) {
 424                  if ( ! isset( $done[ $queued ] ) && isset( $this->registered[ $queued ] ) ) {
 425                      $deps = $this->registered[ $queued ]->deps;
 426                      if ( $deps ) {
 427                          $all_deps += array_fill_keys( $deps, true );
 428                          array_push( $queues, $deps );
 429                      }
 430                      $done[ $queued ] = true;
 431                  }
 432              }
 433              $queue = array_pop( $queues );
 434          }
 435  
 436          $this->all_queued_deps = $all_deps;
 437  
 438          return isset( $this->all_queued_deps[ $handle ] );
 439      }
 440  
 441      /**
 442       * Query the list for an item.
 443       *
 444       * @since 2.1.0
 445       * @since 2.6.0 Moved from `WP_Scripts`.
 446       *
 447       * @param string $handle Name of the item. Should be unique.
 448       * @param string $status Optional. Status of the item to query. Default 'registered'.
 449       * @return bool|_WP_Dependency Found, or object Item data.
 450       */
 451  	public function query( $handle, $status = 'registered' ) {
 452          switch ( $status ) {
 453              case 'registered':
 454              case 'scripts': // Back compat.
 455                  if ( isset( $this->registered[ $handle ] ) ) {
 456                      return $this->registered[ $handle ];
 457                  }
 458                  return false;
 459  
 460              case 'enqueued':
 461              case 'queue': // Back compat.
 462                  if ( in_array( $handle, $this->queue, true ) ) {
 463                      return true;
 464                  }
 465                  return $this->recurse_deps( $this->queue, $handle );
 466  
 467              case 'to_do':
 468              case 'to_print': // Back compat.
 469                  return in_array( $handle, $this->to_do, true );
 470  
 471              case 'done':
 472              case 'printed': // Back compat.
 473                  return in_array( $handle, $this->done, true );
 474          }
 475  
 476          return false;
 477      }
 478  
 479      /**
 480       * Set item group, unless already in a lower group.
 481       *
 482       * @since 2.8.0
 483       *
 484       * @param string    $handle    Name of the item. Should be unique.
 485       * @param bool      $recursion Internal flag that calling function was called recursively.
 486       * @param int|false $group     Group level: level (int), no group (false).
 487       * @return bool Not already in the group or a lower group.
 488       */
 489  	public function set_group( $handle, $recursion, $group ) {
 490          $group = (int) $group;
 491  
 492          if ( isset( $this->groups[ $handle ] ) && $this->groups[ $handle ] <= $group ) {
 493              return false;
 494          }
 495  
 496          $this->groups[ $handle ] = $group;
 497  
 498          return true;
 499      }
 500  
 501      /**
 502       * Get etag header for cache validation.
 503       *
 504       * @since 6.7.0
 505       *
 506       * @global string $wp_version The WordPress version string.
 507       *
 508       * @param string[] $load Array of script or style handles to load.
 509       * @return string Etag header.
 510       */
 511  	public function get_etag( $load ) {
 512          /*
 513           * Note: wp_get_wp_version() is not used here, as this file can be included
 514           * via wp-admin/load-scripts.php or wp-admin/load-styles.php, in which case
 515           * wp-includes/functions.php is not loaded.
 516           */
 517          global $wp_version;
 518  
 519          $etag = "WP:{$wp_version};";
 520  
 521          foreach ( $load as $handle ) {
 522              if ( ! array_key_exists( $handle, $this->registered ) ) {
 523                  continue;
 524              }
 525  
 526              $ver   = $this->registered[ $handle ]->ver ?? $wp_version;
 527              $etag .= "{$handle}:{$ver};";
 528          }
 529  
 530          /*
 531           * This is not intended to be cryptographically secure, just a fast way to get
 532           * a fixed length string based on the script versions. As this file does not
 533           * load the full WordPress environment, it is not possible to use the salted
 534           * wp_hash() function.
 535           */
 536          return 'W/"' . md5( $etag ) . '"';
 537      }
 538  }