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www/vhosts/oinversion.com/httpdocs/vendor/ezyang/htmlpurifier/library/HTMLPurifier/EntityParser.php000064400000011555151700622730030625 0ustar00var<?php

// if want to implement error collecting here, we'll need to use some sort
// of global data (probably trigger_error) because it's impossible to pass
// $config or $context to the callback functions.

/**
 * Handles referencing and derefencing character entities
 */
class HTMLPurifier_EntityParser
{

    /**
     * Reference to entity lookup table.
     * @type HTMLPurifier_EntityLookup
     */
    protected $_entity_lookup;

    /**
     * Callback regex string for parsing entities.
     * @type string
     */
    protected $_substituteEntitiesRegex =
        '/&(?:[#]x([a-fA-F0-9]+)|[#]0*(\d+)|([A-Za-z_:][A-Za-z0-9.\-_:]*));?/';
        //     1. hex             2. dec      3. string (XML style)

    /**
     * Decimal to parsed string conversion table for special entities.
     * @type array
     */
    protected $_special_dec2str =
            array(
                    34 => '"',
                    38 => '&',
                    39 => "'",
                    60 => '<',
                    62 => '>'
            );

    /**
     * Stripped entity names to decimal conversion table for special entities.
     * @type array
     */
    protected $_special_ent2dec =
            array(
                    'quot' => 34,
                    'amp'  => 38,
                    'lt'   => 60,
                    'gt'   => 62
            );

    /**
     * Substitutes non-special entities with their parsed equivalents. Since
     * running this whenever you have parsed character is t3h 5uck, we run
     * it before everything else.
     *
     * @param string $string String to have non-special entities parsed.
     * @return string Parsed string.
     */
    public function substituteNonSpecialEntities($string)
    {
        // it will try to detect missing semicolons, but don't rely on it
        return preg_replace_callback(
            $this->_substituteEntitiesRegex,
            array($this, 'nonSpecialEntityCallback'),
            $string
        );
    }

    /**
     * Callback function for substituteNonSpecialEntities() that does the work.
     *
     * @param array $matches  PCRE matches array, with 0 the entire match, and
     *                  either index 1, 2 or 3 set with a hex value, dec value,
     *                  or string (respectively).
     * @return string Replacement string.
     */

    protected function nonSpecialEntityCallback($matches)
    {
        // replaces all but big five
        $entity = $matches[0];
        $is_num = (@$matches[0][1] === '#');
        if ($is_num) {
            $is_hex = (@$entity[2] === 'x');
            $code = $is_hex ? hexdec($matches[1]) : (int) $matches[2];
            // abort for special characters
            if (isset($this->_special_dec2str[$code])) {
                return $entity;
            }
            return HTMLPurifier_Encoder::unichr($code);
        } else {
            if (isset($this->_special_ent2dec[$matches[3]])) {
                return $entity;
            }
            if (!$this->_entity_lookup) {
                $this->_entity_lookup = HTMLPurifier_EntityLookup::instance();
            }
            if (isset($this->_entity_lookup->table[$matches[3]])) {
                return $this->_entity_lookup->table[$matches[3]];
            } else {
                return $entity;
            }
        }
    }

    /**
     * Substitutes only special entities with their parsed equivalents.
     *
     * @notice We try to avoid calling this function because otherwise, it
     * would have to be called a lot (for every parsed section).
     *
     * @param string $string String to have non-special entities parsed.
     * @return string Parsed string.
     */
    public function substituteSpecialEntities($string)
    {
        return preg_replace_callback(
            $this->_substituteEntitiesRegex,
            array($this, 'specialEntityCallback'),
            $string
        );
    }

    /**
     * Callback function for substituteSpecialEntities() that does the work.
     *
     * This callback has same syntax as nonSpecialEntityCallback().
     *
     * @param array $matches  PCRE-style matches array, with 0 the entire match, and
     *                  either index 1, 2 or 3 set with a hex value, dec value,
     *                  or string (respectively).
     * @return string Replacement string.
     */
    protected function specialEntityCallback($matches)
    {
        $entity = $matches[0];
        $is_num = (@$matches[0][1] === '#');
        if ($is_num) {
            $is_hex = (@$entity[2] === 'x');
            $int = $is_hex ? hexdec($matches[1]) : (int) $matches[2];
            return isset($this->_special_dec2str[$int]) ?
                $this->_special_dec2str[$int] :
                $entity;
        } else {
            return isset($this->_special_ent2dec[$matches[3]]) ?
                $this->_special_ent2dec[$matches[3]] :
                $entity;
        }
    }
}

// vim: et sw=4 sts=4

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