vendor/ezyang/htmlpurifier/library/HTMLPurifier/Strategy/FixNesting.php

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<?php

/**
 * Takes a well formed list of tokens and fixes their nesting.
 *
 * HTML elements dictate which elements are allowed to be their children,
 * for example, you can't have a p tag in a span tag.  Other elements have
 * much more rigorous definitions: tables, for instance, require a specific
 * order for their elements.  There are also constraints not expressible by
 * document type definitions, such as the chameleon nature of ins/del
 * tags and global child exclusions.
 *
 * The first major objective of this strategy is to iterate through all
 * the nodes and determine whether or not their children conform to the
 * element's definition.  If they do not, the child definition may
 * optionally supply an amended list of elements that is valid or
 * require that the entire node be deleted (and the previous node
 * rescanned).
 *
 * The second objective is to ensure that explicitly excluded elements of
 * an element do not appear in its children.  Code that accomplishes this
 * task is pervasive through the strategy, though the two are distinct tasks
 * and could, theoretically, be seperated (although it's not recommended).
 *
 * @note Whether or not unrecognized children are silently dropped or
 *       translated into text depends on the child definitions.
 *
 * @todo Enable nodes to be bubbled out of the structure.  This is
 *       easier with our new algorithm.
 */

class HTMLPurifier_Strategy_FixNesting extends HTMLPurifier_Strategy
{

    /**
     * @param HTMLPurifier_Token[] $tokens
     * @param HTMLPurifier_Config $config
     * @param HTMLPurifier_Context $context
     * @return array|HTMLPurifier_Token[]
     */
    public function execute($tokens, $config, $context)
    {

        //####################################################################//
        // Pre-processing

        // O(n) pass to convert to a tree, so that we can efficiently
        // refer to substrings
        $top_node = HTMLPurifier_Arborize::arborize($tokens, $config, $context);

        // get a copy of the HTML definition
        $definition = $config->getHTMLDefinition();

        $excludes_enabled = !$config->get('Core.DisableExcludes');

        // setup the context variable 'IsInline', for chameleon processing
        // is 'false' when we are not inline, 'true' when it must always
        // be inline, and an integer when it is inline for a certain
        // branch of the document tree
        $is_inline = $definition->info_parent_def->descendants_are_inline;