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<?php

// Enum = Enumerated

/**

* Validates a keyword against a list of valid values.

* @warning The case-insensitive compare of this function uses PHP's

*          built-in strtolower and ctype_lower functions, which may

*          cause problems with international comparisons

class HTMLPurifier_AttrDef_Enum extends HTMLPurifier_AttrDef

{

/**

* Lookup table of valid values.

* @type array

* @todo Make protected

public $valid_values = array();

/**

* Bool indicating whether or not enumeration is case sensitive.

* @note In general this is always case insensitive.

protected $case_sensitive = false; // values according to W3C spec

/**

* @param array $valid_values List of valid values

* @param bool $case_sensitive Whether or not case sensitive

public function __construct($valid_values = array(), $case_sensitive = false)

{

$this->valid_values = array_flip($valid_values);

$this->case_sensitive = $case_sensitive;

}

/**

* @param string $string

* @param HTMLPurifier_Config $config

* @param HTMLPurifier_Context $context

* @return bool|string

public function validate($string, $config, $context)

{

$string = trim($string);

if (!$this->case_sensitive) {

// we may want to do full case-insensitive libraries

$string = ctype_lower($string) ? $string : strtolower($string);

}

$result = isset($this->valid_values[$string]);

return $result ? $string : false;

}

/**

* @param string $string In form of comma-delimited list of case-insensitive

*      valid values. Example: "foo,bar,baz". Prepend "s:" to make

*      case sensitive

* @return HTMLPurifier_AttrDef_Enum

public function make($string)

{

if (strlen($string) > 2 && $string[0] == 's' && $string[1] == ':') {

$string = substr($string, 2);

$sensitive = true;

} else {

$sensitive = false;

}

$values = explode(',', $string);

return new HTMLPurifier_AttrDef_Enum($values, $sensitive);

}

// vim: et sw=4 sts=4

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