$minimized
$minimized
Tells us whether or not an HTML attribute is minimized.
Has no meaning in other contexts.
Validates the value of background-position.
parseCDATA(mixed $string) : mixed
Convenience method that parses a string as if it were CDATA.
This method process a string in the manner specified at http://www.w3.org/TR/html4/types.html#h-6.2 by removing leading and trailing whitespace, ignoring line feeds, and replacing carriage returns and tabs with spaces. While most useful for HTML attributes specified as CDATA, it can also be applied to most CSS values.
mixed | $string |
<?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