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   1  <?php
   2  /**
   3   * BackPress Scripts enqueue.
   4   *
   5   * These classes were refactored from the WordPress WP_Scripts and WordPress
   6   * script enqueue API.
   7   *
   8   * @package BackPress
   9   * @since r74
  10   */
  11  
  12  /**
  13   * BackPress enqueued dependiences class.
  14   *
  15   * @package BackPress
  16   * @uses _WP_Dependency
  17   * @since r74
  18   */
  19  class WP_Dependencies {
  20      var $registered = array();
  21      var $queue = array();
  22      var $to_do = array();
  23      var $done = array();
  24      var $args = array();
  25      var $groups = array();
  26      var $group = 0;
  27  
  28  	function __construct() {}
  29  
  30  	function WP_Dependencies() {
  31          $args = func_get_args();
  32          call_user_func_array( array(&$this, '__construct'), $args );
  33      }
  34  
  35      /**
  36       * Do the dependencies
  37       *
  38       * Process the items passed to it or the queue.  Processes all dependencies.
  39       *
  40       * @param mixed handles (optional) items to be processed.  (void) processes queue, (string) process that item, (array of strings) process those items
  41       * @return array Items that have been processed
  42       */
  43  	function do_items( $handles = false, $group = false ) {
  44          // Print the queue if nothing is passed.  If a string is passed, print that script.  If an array is passed, print those scripts.
  45          $handles = false === $handles ? $this->queue : (array) $handles;
  46          $this->all_deps( $handles );
  47  
  48          foreach( $this->to_do as $key => $handle ) {
  49              if ( !in_array($handle, $this->done) && isset($this->registered[$handle]) ) {
  50  
  51                  if ( ! $this->registered[$handle]->src ) { // Defines a group.
  52                      $this->done[] = $handle;
  53                      continue;
  54                  }
  55  
  56                  if ( $this->do_item( $handle, $group ) )
  57                      $this->done[] = $handle;
  58  
  59                  unset( $this->to_do[$key] );
  60              }
  61          }
  62  
  63          return $this->done;
  64      }
  65  
  66  	function do_item( $handle ) {
  67          return isset($this->registered[$handle]);
  68      }
  69  
  70      /**
  71       * Determines dependencies
  72       *
  73       * Recursively builds array of items to process taking dependencies into account.  Does NOT catch infinite loops.
  74       *
  75  
  76       * @param mixed handles Accepts (string) dep name or (array of strings) dep names
  77       * @param bool recursion Used internally when function calls itself
  78       */
  79  	function all_deps( $handles, $recursion = false, $group = false ) {
  80          if ( !$handles = (array) $handles )
  81              return false;
  82  
  83          foreach ( $handles as $handle ) {
  84              $handle_parts = explode('?', $handle);
  85              $handle = $handle_parts[0];
  86              $queued = in_array($handle, $this->to_do, true);
  87  
  88              if ( in_array($handle, $this->done, true) ) // Already done
  89                  continue;
  90  
  91              $moved = $this->set_group( $handle, $recursion, $group );
  92  
  93              if ( $queued && !$moved ) // already queued and in the right group
  94                  continue;
  95  
  96              $keep_going = true;
  97              if ( !isset($this->registered[$handle]) )
  98                  $keep_going = false; // Script doesn't exist
  99              elseif ( $this->registered[$handle]->deps && array_diff($this->registered[$handle]->deps, array_keys($this->registered)) )
 100                  $keep_going = false; // Script requires deps which don't exist (not a necessary check.  efficiency?)
 101              elseif ( $this->registered[$handle]->deps && !$this->all_deps( $this->registered[$handle]->deps, true, $group ) )
 102                  $keep_going = false; // Script requires deps which don't exist
 103  
 104              if ( !$keep_going ) { // Either script or its deps don't exist.
 105                  if ( $recursion )
 106                      return false; // Abort this branch.
 107                  else
 108                      continue; // We're at the top level.  Move on to the next one.
 109              }
 110  
 111              if ( $queued ) // Already grobbed it and its deps
 112                  continue;
 113  
 114              if ( isset($handle_parts[1]) )
 115                  $this->args[$handle] = $handle_parts[1];
 116  
 117              $this->to_do[] = $handle;
 118          }
 119  
 120          return true;
 121      }
 122  
 123      /**
 124       * Adds item
 125       *
 126       * Adds the item only if no item of that name already exists
 127       *
 128       * @param string handle Script name
 129       * @param string src Script url
 130       * @param array deps (optional) Array of script names on which this script depends
 131       * @param string ver (optional) Script version (used for cache busting)
 132       * @return array Hierarchical array of dependencies
 133       */
 134  	function add( $handle, $src, $deps = array(), $ver = false, $args = null ) {
 135          if ( isset($this->registered[$handle]) )
 136              return false;
 137          $this->registered[$handle] = new _WP_Dependency( $handle, $src, $deps, $ver, $args );
 138          return true;
 139      }
 140  
 141      /**
 142       * Adds extra data
 143       *
 144       * Adds data only if script has already been added
 145       *
 146       * @param string handle Script name
 147       * @param string data_name Name of object in which to store extra data
 148       * @param array data Array of extra data
 149       * @return bool success
 150       */
 151  	function add_data( $handle, $data_name, $data ) {
 152          if ( !isset($this->registered[$handle]) )
 153              return false;
 154          return $this->registered[$handle]->add_data( $data_name, $data );
 155      }
 156  
 157  	function remove( $handles ) {
 158          foreach ( (array) $handles as $handle )
 159              unset($this->registered[$handle]);
 160      }
 161  
 162  	function enqueue( $handles ) {
 163          foreach ( (array) $handles as $handle ) {
 164              $handle = explode('?', $handle);
 165              if ( !in_array($handle[0], $this->queue) && isset($this->registered[$handle[0]]) ) {
 166                  $this->queue[] = $handle[0];
 167                  if ( isset($handle[1]) )
 168                      $this->args[$handle[0]] = $handle[1];
 169              }
 170          }
 171      }
 172  
 173  	function dequeue( $handles ) {
 174          foreach ( (array) $handles as $handle ) {
 175              $handle = explode('?', $handle);
 176              $key = array_search($handle[0], $this->queue);
 177              if ( false !== $key ) {
 178                  unset($this->queue[$key]);
 179                  unset($this->args[$handle[0]]);
 180              }
 181          }
 182      }
 183  
 184  	function query( $handle, $list = 'registered' ) { // registered, queue, done, to_do
 185          switch ( $list ) :
 186          case 'registered':
 187          case 'scripts': // back compat
 188              if ( isset($this->registered[$handle]) )
 189                  return $this->registered[$handle];
 190              break;
 191          case 'to_print': // back compat
 192          case 'printed': // back compat
 193              if ( 'to_print' == $list )
 194                  $list = 'to_do';
 195              else
 196                  $list = 'printed';
 197          default:
 198              if ( in_array($handle, $this->$list) )
 199                  return true;
 200              break;
 201          endswitch;
 202          return false;
 203      }
 204  
 205  	function set_group( $handle, $recursion, $group ) {
 206          $group = (int) $group;
 207  
 208          if ( $recursion )
 209              $group = min($this->group, $group);
 210          else
 211              $this->group = $group;
 212  
 213          if ( isset($this->groups[$handle]) && $this->groups[$handle] <= $group )
 214              return false;
 215  
 216          $this->groups[$handle] = $group;
 217          return true;
 218      }
 219  
 220  }
 221  
 222  class _WP_Dependency {
 223      var $handle;
 224      var $src;
 225      var $deps = array();
 226      var $ver = false;
 227      var $args = null;
 228  
 229      var $extra = array();
 230  
 231  	function __construct() {
 232          @list($this->handle, $this->src, $this->deps, $this->ver, $this->args) = func_get_args();
 233          if ( !is_array($this->deps) )
 234              $this->deps = array();
 235      }
 236  
 237  	function _WP_Dependency() {
 238          self::__construct();
 239      }
 240  
 241  	function add_data( $name, $data ) {
 242          if ( !is_scalar($name) )
 243              return false;
 244          $this->extra[$name] = $data;
 245          return true;
 246      }
 247  }