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<?php

/**

* Custom validation class, accepts DTD child definitions

* @warning Currently this class is an all or nothing proposition, that is,

*          it will only give a bool return value.

class HTMLPurifier_ChildDef_Custom extends HTMLPurifier_ChildDef

{

/**

* @type string

public $type = 'custom';

/**

* @type bool

public $allow_empty = false;

/**

* Allowed child pattern as defined by the DTD.

* @type string

public $dtd_regex;

/**

* PCRE regex derived from $dtd_regex.

* @type string

private $_pcre_regex;

/**

* @param $dtd_regex Allowed child pattern from the DTD

public function __construct($dtd_regex)

{

$this->dtd_regex = $dtd_regex;

$this->_compileRegex();

}

/**

* Compiles the PCRE regex from a DTD regex ($dtd_regex to $_pcre_regex)

protected function _compileRegex()

{

$raw = str_replace(' ', '', $this->dtd_regex);

if ($raw{0} != '(') {

$raw = "($raw)";

}

$el = '[#a-zA-Z0-9_.-]+';

$reg = $raw;

// COMPLICATED! AND MIGHT BE BUGGY! I HAVE NO CLUE WHAT I'M

// DOING! Seriously: if there's problems, please report them.

// collect all elements into the $elements array

preg_match_all("/$el/", $reg, $matches);

foreach ($matches[0] as $match) {

$this->elements[$match] = true;

}

// setup all elements as parentheticals with leading commas

$reg = preg_replace("/$el/", '(,\\0)', $reg);

// remove commas when they were not solicited

$reg = preg_replace("/([^,(|]\(+),/", '\\1', $reg);

// remove all non-paranthetical commas: they are handled by first regex

$reg = preg_replace("/,\(/", '(', $reg);

$this->_pcre_regex = $reg;

}

/**

* @param HTMLPurifier_Node[] $children

* @param HTMLPurifier_Config $config

* @param HTMLPurifier_Context $context

* @return bool

public function validateChildren($children, $config, $context)

{

$list_of_children = '';

$nesting = 0; // depth into the nest

foreach ($children as $node) {

if (!empty($node->is_whitespace)) {

continue;

}

$list_of_children .= $node->name . ',';

}

// add leading comma to deal with stray comma declarations

$list_of_children = ',' . rtrim($list_of_children, ',');

$okay =

preg_match(

'/^,?' . $this->_pcre_regex . '$/',

$list_of_children

);

return (bool)$okay;

}

// vim: et sw=4 sts=4

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