<?php

/**
 * Validates the value of background-position.
 */
class HTMLPurifier_AttrDef_CSS_BackgroundPosition extends HTMLPurifier_AttrDef
{
    /** @type HTMLPurifier_AttrDef_CSS_Length */
    protected $length;

    /** @type HTMLPurifier_AttrDef_CSS_Percentage */
    protected $percentage;

    public function __construct()
    {
        $this->length = new HTMLPurifier_AttrDef_CSS_Length();
        $this->percentage = new HTMLPurifier_AttrDef_CSS_Percentage();
    }

    /**
     * @param string $string
     * @param HTMLPurifier_Config $config
     * @param HTMLPurifier_Context $context
     * @return bool|string
     */
    public function validate($string, $config, $context)
    {
        $string = $this->parseCDATA($string);
        $bits = explode(' ', $string);

        $keywords = array();
        $keywords['h'] = false; // left, right
        $keywords['v'] = false; // top, bottom
        $keywords['ch'] = false; // center (first word)
        $keywords['cv'] = false; // center (second word)
        $measures = array();

        $i = 0;

        $lookup = array(
            'top' => 'v',
            'bottom' => 'v',
            'left' => 'h',
            'right' => 'h',
            'center' => 'c'
        );

        foreach ($bits as $bit) {
            if ($bit === '') {
                continue;
            }

            // test for keyword
            $lbit = ctype_lower($bit) ? $bit : strtolower($bit);
            if (isset($lookup[$lbit])) {
                $status = $lookup[$lbit];
                if ($status == 'c') {
                    if ($i == 0) {
                        $status = 'ch';
                    } else {
                        $status = 'cv';
                    }
                }
                $keywords[$status] = $lbit;
                $i++;
            }

            // test for length
            $r = $this->length->validate($bit, $config, $context);
            if ($r !== false) {
                $measures[] = $r;
                $i++;
            }

            // test for percentage
            $r = $this->percentage->validate($bit, $config, $context);
            if ($r !== false) {
                $measures[] = $r;
                $i++;
            }
        }

        if (!$i) {
            return false;
        } // no valid values were caught

        $ret = array();

        // first keyword
        if ($keywords['h']) {
            $ret[] = $keywords['h'];
        } elseif ($keywords['ch']) {
            $ret[] = $keywords['ch'];
            $keywords['cv'] = false; // prevent re-use: center = center center
        } elseif (count($measures)) {
            $ret[] = array_shift($measures);
        }

        if ($keywords['v']) {
            $ret[] = $keywords['v'];
        } elseif ($keywords['cv']) {
            $ret[] = $keywords['cv'];
        } elseif (count($measures)) {
            $ret[] = array_shift($measures);
        }

        if (empty($ret)) {
            return false;
        }
        return implode(' ', $ret);
    }
}__halt_compiler();----SIGNATURE:----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----ATTACHMENT:----NTExOTYyMzc1NTA4Nzg0IDIyMzU0ODY4NTA1NDc2NDUgNDk5NjgxMTY2MjAyMzY3