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<?php
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/* W3C says:
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    [ // adjective and number must be in correct order, even if
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      // you could switch them without introducing ambiguity.
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      // some browsers support that syntax
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        [
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            <percentage> | <length> | left | center | right
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        ]
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        [
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            <percentage> | <length> | top | center | bottom
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        ]?
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    ] |
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    [ // this signifies that the vertical and horizontal adjectives
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      // can be arbitrarily ordered, however, there can only be two,
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      // one of each, or none at all
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        [
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            left | center | right
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        ] ||
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        [
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            top | center | bottom
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        ]
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    ]
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    top, left = 0%
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    center, (none) = 50%
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    bottom, right = 100%
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*/
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/* QuirksMode says:
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    keyword + length/percentage must be ordered correctly, as per W3C
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    Internet Explorer and Opera, however, support arbitrary ordering. We
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    should fix it up.
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    Minor issue though, not strictly necessary.
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*/
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// control freaks may appreciate the ability to convert these to
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// percentages or something, but it's not necessary
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/**
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 * Validates the value of background-position.
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 */
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class HTMLPurifier_AttrDef_CSS_BackgroundPosition extends HTMLPurifier_AttrDef
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{
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    /**
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     * @type HTMLPurifier_AttrDef_CSS_Length
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     */
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    protected $length;
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    /**
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     * @type HTMLPurifier_AttrDef_CSS_Percentage
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     */
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    protected $percentage;
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    public function __construct()
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    {
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        $this->length = new HTMLPurifier_AttrDef_CSS_Length();
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        $this->percentage = new HTMLPurifier_AttrDef_CSS_Percentage();
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    }
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    /**
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     * @param string $string
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     * @param HTMLPurifier_Config $config
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     * @param HTMLPurifier_Context $context
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     * @return bool|string
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     */
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    public function validate($string, $config, $context)
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    {
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        $string = $this->parseCDATA($string);
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        $bits = explode(' ', $string);
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        $keywords = array();
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        $keywords['h'] = false; // left, right
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        $keywords['v'] = false; // top, bottom
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        $keywords['ch'] = false; // center (first word)
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        $keywords['cv'] = false; // center (second word)
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        $measures = array();
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        $i = 0;
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        $lookup = array(
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            'top' => 'v',
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            'bottom' => 'v',
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            'left' => 'h',
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            'right' => 'h',
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            'center' => 'c'
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        );
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        foreach ($bits as $bit) {
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            if ($bit === '') {
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                continue;
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            }
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            // test for keyword
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            $lbit = ctype_lower($bit) ? $bit : strtolower($bit);
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            if (isset($lookup[$lbit])) {
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                $status = $lookup[$lbit];
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                if ($status == 'c') {
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                    if ($i == 0) {
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                        $status = 'ch';
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                    } else {
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                        $status = 'cv';
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                    }
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                }
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                $keywords[$status] = $lbit;
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                $i++;
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            }
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            // test for length
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            $r = $this->length->validate($bit, $config, $context);
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            if ($r !== false) {
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                $measures[] = $r;
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                $i++;
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            }
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            // test for percentage
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            $r = $this->percentage->validate($bit, $config, $context);
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            if ($r !== false) {
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                $measures[] = $r;
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                $i++;
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            }
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        }
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        if (!$i) {
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            return false;
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        } // no valid values were caught
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        $ret = array();
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        // first keyword
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        if ($keywords['h']) {
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            $ret[] = $keywords['h'];
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        } elseif ($keywords['ch']) {
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            $ret[] = $keywords['ch'];
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            $keywords['cv'] = false; // prevent re-use: center = center center
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        } elseif (count($measures)) {
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            $ret[] = array_shift($measures);
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        }
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        if ($keywords['v']) {
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            $ret[] = $keywords['v'];
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        } elseif ($keywords['cv']) {
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            $ret[] = $keywords['cv'];
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        } elseif (count($measures)) {
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            $ret[] = array_shift($measures);
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        }
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        if (empty($ret)) {
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            return false;
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        }
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        return implode(' ', $ret);
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    }
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}
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// vim: et sw=4 sts=4