PPDStack.php

Go to the documentation of this file.

<?php
class PPDStack {
    public $stack;
    public $rootAccum;
    public $accum;
 
    public $top;
    public $out;
    public $elementClass = PPDStackElement::class;
 
    public static $false = false;
 
    public function __construct() {
        $this->stack = [];
        $this->top = false;
        $this->rootAccum = '';
        $this->accum =& $this->rootAccum;
    }
 
    public function count() {
        return count( $this->stack );
    }
 
    public function &getAccum() {
        return $this->accum;
    }
 
    public function getCurrentPart() {
        if ( $this->top === false ) {
            return false;
        } else {
            return $this->top->getCurrentPart();
        }
    }
 
    public function push( $data ) {
        if ( $data instanceof $this->elementClass ) {
            $this->stack[] = $data;
        } else {
            $class = $this->elementClass;
            $this->stack[] = new $class( $data );
        }
        $this->top = $this->stack[count( $this->stack ) - 1];
        $this->accum =& $this->top->getAccum();
    }
 
    public function pop() {
        if ( $this->stack === [] ) {
            throw new MWException( __METHOD__ . ': no elements remaining' );
        }
        $temp = array_pop( $this->stack );
 
        if ( count( $this->stack ) ) {
            $this->top = $this->stack[count( $this->stack ) - 1];
            $this->accum =& $this->top->getAccum();
        } else {
            $this->top = self::$false;
            $this->accum =& $this->rootAccum;
        }
        return $temp;
    }
 
    public function addPart( $s = '' ) {
        $this->top->addPart( $s );
        $this->accum =& $this->top->getAccum();
    }
 
    public function getFlags() {
        if ( $this->stack === [] ) {
            return [
                'findEquals' => false,
                'findPipe' => false,
                'inHeading' => false,
            ];
        } else {
            return $this->top->getFlags();
        }
    }
}