protected function initializeEscapers()
{
$that = $this;
$this->escapers = array(
'html' =>
/**
* Runs the PHP function htmlspecialchars on the value passed.
*
* @param string $value the value to escape
*
* @return string the escaped value
*/
function ($value) use ($that)
{
// Numbers and Boolean values get turned into strings which can cause problems
// with type comparisons (e.g. === or is_int() etc).
return is_string($value) ? htmlspecialchars($value, ENT_QUOTES, $that->getCharset(), false) : $value;
},
'js' =>
/**
* A function that escape all non-alphanumeric characters
* into their \xHH or \uHHHH representations
*
* @param string $value the value to escape
* @return string the escaped value
*/
function ($value) use ($that)
{
if ('UTF-8' != $that->getCharset()) {
$value = $that->convertEncoding($value, 'UTF-8', $that->getCharset());
}
$callback = function ($matches) use ($that)
{
$char = $matches[0];
// \xHH
if (!isset($char[1])) {
return '\\x'.substr('00'.bin2hex($char), -2);
}
// \uHHHH
$char = $that->convertEncoding($char, 'UTF-16BE', 'UTF-8');
return '\\u'.substr('0000'.bin2hex($char), -4);
};
if (null === $value = preg_replace_callback('#[^\p{L}\p{N} ]#u', $callback, $value)) {
throw new \InvalidArgumentException('The string to escape is not a valid UTF-8 string.');
}
if ('UTF-8' != $that->getCharset()) {
$value = $that->convertEncoding($value, $that->getCharset(), 'UTF-8');
}
return $value;
},
);
}
