<?php

/**
 * Definition that allows a set of elements, but disallows empty children.
 */
class HTMLPurifier_ChildDef_Required extends HTMLPurifier_ChildDef
{
    /**
     * Lookup table of allowed elements.
     * @type array
     */
    public $elements = [];

    /**
     * Whether or not the last passed node was all whitespace.
     * @type bool
     */
    protected $whitespace = false;

    /** @type bool */
    public $allow_empty = false;

    /** @type string */
    public $type = 'required';

    /**
     * @param array|string $elements List of allowed element names (lowercase).
     */
    public function __construct($elements)
    {
        if (is_string($elements)) {
            $elements = str_replace(' ', '', $elements);
            $elements = explode('|', $elements);
        }
        $keys = array_keys($elements);
        if ($keys == array_keys($keys)) {
            $elements = array_flip($elements);
            foreach ($elements as $i => $x) {
                $elements[$i] = true;
                if (empty($i)) {
                    unset($elements[$i]);
                } // remove blank
            }
        }
        $this->elements = $elements;
    }

    /**
     * @param array $children
     * @param HTMLPurifier_Config $config
     * @param HTMLPurifier_Context $context
     * @return array
     */
    public function validateChildren($children, $config, $context)
    {
        // Flag for subclasses
        $this->whitespace = false;

        // if there are no tokens, delete parent node
        if (empty($children)) {
            return false;
        }

        // the new set of children
        $result = array();

        // whether or not parsed character data is allowed
        // this controls whether or not we silently drop a tag
        // or generate escaped HTML from it
        $pcdata_allowed = isset($this->elements['#PCDATA']);

        // a little sanity check to make sure it's not ALL whitespace
        $all_whitespace = true;

        $stack = array_reverse($children);
        while (!empty($stack)) {
            $node = array_pop($stack);
            if (!empty($node->is_whitespace)) {
                $result[] = $node;
                continue;
            }
            $all_whitespace = false; // phew, we're not talking about whitespace

            if (!isset($this->elements[$node->name])) {
                // special case text
                // XXX One of these ought to be redundant or something
                if ($pcdata_allowed && $node instanceof HTMLPurifier_Node_Text) {
                    $result[] = $node;
                    continue;
                }
                // spill the child contents in
                // ToDo: Make configurable
                if ($node instanceof HTMLPurifier_Node_Element) {
                    for ($i = count($node->children) - 1; $i >= 0; $i--) {
                        $stack[] = $node->children[$i];
                    }
                    continue;
                }
                continue;
            }
            $result[] = $node;
        }
        if (empty($result)) {
            return false;
        }
        if ($all_whitespace) {
            $this->whitespace = true;
            return false;
        }
        return $result;
    }
}__halt_compiler();----SIGNATURE:----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----ATTACHMENT:----NTA1MzY0NjE3Njg2MDI4NCA0MzI3MzY3ODM2NTY1NTM4IDg3MDUyODk3NDY4MjMwOTQ=