Validates the value of background-position. More...

Inheritance diagram for HTMLPurifier_AttrDef_CSS_BackgroundPosition:

Collaboration diagram for HTMLPurifier_AttrDef_CSS_BackgroundPosition:

Public Member Functions
	__construct ()
	validate ($string, $config, $context)
Public Member Functions inherited from HTMLPurifier_AttrDef
	parseCDATA ($string)
	Convenience method that parses a string as if it were CDATA.
	make ($string)
	Factory method for creating this class from a string.

Protected Attributes
	$length
	HTMLPurifier_AttrDef_CSS_Length
	$percentage
	HTMLPurifier_AttrDef_CSS_Percentage

Additional Inherited Members
Data Fields inherited from HTMLPurifier_AttrDef
	$minimized = false
	Tells us whether or not an HTML attribute is minimized.
	$required = false
	Tells us whether or not an HTML attribute is required.
Protected Member Functions inherited from HTMLPurifier_AttrDef
	mungeRgb ($string)
	Removes spaces from rgb(0, 0, 0) so that shorthand CSS properties work properly.
	expandCSSEscape ($string)
	Parses a possibly escaped CSS string and returns the "pure" version of it.

Detailed Description

Validates the value of background-position.

Definition at line 44 of file BackgroundPosition.php.

Constructor & Destructor Documentation

HTMLPurifier_AttrDef_CSS_BackgroundPosition::__construct ( )

Definition at line 57 of file BackgroundPosition.php.

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

Member Function Documentation

HTMLPurifier_AttrDef_CSS_BackgroundPosition::validate	(	$string,
		$config,
		$context
	)

Parameters

string	$string
HTMLPurifier_Config	$config
HTMLPurifier_Context	$context

Returns: bool|string

Reimplemented from HTMLPurifier_AttrDef.

Definition at line 69 of file BackgroundPosition.php.

References $ret, and HTMLPurifier_AttrDef\parseCDATA().

    {
        $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);
    }