includes/parser/PPDStack.php

   1 <?php
   2 /**
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License as published by
   5  * the Free Software Foundation; either version 2 of the License, or
   6  * (at your option) any later version.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along
  14  * with this program; if not, write to the Free Software Foundation, Inc.,
  15  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  16  * http://www.gnu.org/copyleft/gpl.html
  17  *
  18  * @file
  19  * @ingroup Parser
  20  */
  21
  22 /**
  23  * Stack class to help Preprocessor::preprocessToObj()
  24  * @ingroup Parser
  25  */
  26 class PPDStack {
  27         public $stack, $rootAccum;
  28
  29         /**
  30          * @var PPDStack|false
  31          */
  32         public $top;
  33         public $out;
  34         public $elementClass = PPDStackElement::class;
  35
  36         public static $false = false;
  37
  38         public function __construct() {
  39                 $this->stack = [];
  40                 $this->top = false;
  41                 $this->rootAccum = '';
  42                 $this->accum =& $this->rootAccum;
  43         }
  44
  45         /**
  46          * @return int
  47          */
  48         public function count() {
  49                 return count( $this->stack );
  50         }
  51
  52         public function &getAccum() {
  53                 return $this->accum;
  54         }
  55
  56         /**
  57          * @return bool|PPDPart
  58          */
  59         public function getCurrentPart() {
  60                 if ( $this->top === false ) {
  61                         return false;
  62                 } else {
  63                         return $this->top->getCurrentPart();
  64                 }
  65         }
  66
  67         public function push( $data ) {
  68                 if ( $data instanceof $this->elementClass ) {
  69                         $this->stack[] = $data;
  70                 } else {
  71                         $class = $this->elementClass;
  72                         $this->stack[] = new $class( $data );
  73                 }
  74                 $this->top = $this->stack[count( $this->stack ) - 1];
  75                 $this->accum =& $this->top->getAccum();
  76         }
  77
  78         public function pop() {
  79                 if ( $this->stack === [] ) {
  80                         throw new MWException( __METHOD__ . ': no elements remaining' );
  81                 }
  82                 $temp = array_pop( $this->stack );
  83
  84                 if ( count( $this->stack ) ) {
  85                         $this->top = $this->stack[count( $this->stack ) - 1];
  86                         $this->accum =& $this->top->getAccum();
  87                 } else {
  88                         $this->top = self::$false;
  89                         $this->accum =& $this->rootAccum;
  90                 }
  91                 return $temp;
  92         }
  93
  94         public function addPart( $s = '' ) {
  95                 $this->top->addPart( $s );
  96                 $this->accum =& $this->top->getAccum();
  97         }
  98
  99         /**
 100          * @return array
 101          */
 102         public function getFlags() {
 103                 if ( $this->stack === [] ) {
 104                         return [
 105                                 'findEquals' => false,
 106                                 'findPipe' => false,
 107                                 'inHeading' => false,
 108                         ];
 109                 } else {
 110                         return $this->top->getFlags();
 111                 }
 112         }
 113 }