/**
* Checks validity of a string based on regex
* and responds if invalid chars are found
*
* @param string $string The value bein checked
* @param string $Thing Human-readable name for $string
* @param string $pattern An inverse pattern that matches INVALID characters
* @param bool $returnError If true retursn the error message instead of responding
*
* @return null|string
*/
static function checkStringValidity($string, $Thing, $pattern, $returnError = false)
{
if (preg_match_all(new RegExp($pattern, 'u'), $string, $fails)) {
$invalid = array();
foreach ($fails[0] as $f) {
if (!in_array($f, $invalid)) {
switch ($f) {
case "\n":
$invalid[] = '\\n';
case "\r":
$invalid[] = '\\r';
default:
$invalid[] = $f;
}
}
}
$count = count($invalid);
$s = $count !== 1 ? 's' : '';
$the_following = $count !== 1 ? 'the following' : 'an';
$Error = "{$Thing} (" . self::escapeHTML($string) . ") contains {$the_following} invalid character{$s}: " . CoreUtils::arrayToNaturalString($invalid);
if ($returnError) {
return $Error;
}
Response::fail($Error);
}
}
function testArrayToNaturalString()
{
$result = CoreUtils::arrayToNaturalString([1]);
self::assertEquals('1', $result);
$result = CoreUtils::arrayToNaturalString([1, 2]);
self::assertEquals('1 and 2', $result);
$result = CoreUtils::arrayToNaturalString([1, 2, 3]);
self::assertEquals('1, 2 and 3', $result);
$result = CoreUtils::arrayToNaturalString([1, 2, 3, 4]);
self::assertEquals('1, 2, 3 and 4', $result);
}
