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<?php

/* W3C says:

[ // adjective and number must be in correct order, even if

// you could switch them without introducing ambiguity.

// some browsers support that syntax

[

<percentage> | <length> | left | center | right

]

[

<percentage> | <length> | top | center | bottom

] |

[ // this signifies that the vertical and horizontal adjectives

// can be arbitrarily ordered, however, there can only be two,

// one of each, or none at all

[

left | center | right

] ||

[

top | center | bottom

]

top, left = 0%

center, (none) = 50%

bottom, right = 100%

/* QuirksMode says:

keyword + length/percentage must be ordered correctly, as per W3C

Internet Explorer and Opera, however, support arbitrary ordering. We

should fix it up.

Minor issue though, not strictly necessary.

// control freaks may appreciate the ability to convert these to

// percentages or something, but it's not necessary

/**

* 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);

}

// vim: et sw=4 sts=4

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