HTMLPurifier_AttrDef_Lang Class Reference

Validates the HTML attribute lang, effectively a language code. More...

Inheritance diagram for HTMLPurifier_AttrDef_Lang:

Collaboration diagram for HTMLPurifier_AttrDef_Lang:

Public Member Functions
	validate ($string, $config, $context)
Public Member Functions inherited from HTMLPurifier_AttrDef
	validate ($string, $config, $context)
	Validates and cleans passed string according to a definition. More...
	parseCDATA ($string)
	Convenience method that parses a string as if it were CDATA. More...
	make ($string)
	Factory method for creating this class from a string. More...

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

Detailed Description

Validates the HTML attribute lang, effectively a language code.

Note

Built according to RFC 3066, which obsoleted RFC 1766

Definition at line 7 of file Lang.php.

Member Function Documentation

validate()

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

Definition at line 10 of file Lang.php.

                                                         {

        $string = trim($string);
        if (!$string) return false;

        $subtags = explode('-', $string);
        $num_subtags = count($subtags);

        if ($num_subtags == 0) return false; // sanity check

        // process primary subtag : $subtags[0]
        $length = strlen($subtags[0]);
        switch ($length) {
            case 0:
                return false;
            case 1:
                if (! ($subtags[0] == 'x' || $subtags[0] == 'i') ) {
                    return false;
                }
                break;
            case 2:
            case 3:
                if (! ctype_alpha($subtags[0]) ) {
                    return false;
                } elseif (! ctype_lower($subtags[0]) ) {
                    $subtags[0] = strtolower($subtags[0]);
                }
                break;
            default:
                return false;
        }

        $new_string = $subtags[0];
        if ($num_subtags == 1) return $new_string;

        // process second subtag : $subtags[1]
        $length = strlen($subtags[1]);
        if ($length == 0 || ($length == 1 && $subtags[1] != 'x') || $length > 8 || !ctype_alnum($subtags[1])) {
            return $new_string;
        }
        if (!ctype_lower($subtags[1])) $subtags[1] = strtolower($subtags[1]);

        $new_string .= '-' . $subtags[1];
        if ($num_subtags == 2) return $new_string;

        // process all other subtags, index 2 and up
        for ($i = 2; $i < $num_subtags; $i++) {
            $length = strlen($subtags[$i]);
            if ($length == 0 || $length > 8 || !ctype_alnum($subtags[$i])) {
                return $new_string;
            }
            if (!ctype_lower($subtags[$i])) {
                $subtags[$i] = strtolower($subtags[$i]);
            }
            $new_string .= '-' . $subtags[$i];
        }

        return $new_string;

    }

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The documentation for this class was generated from the following file:

• Services/Html/HtmlPurifier/library/HTMLPurifier/AttrDef/Lang.php