glue.php
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<?php
/**
* glue
*
* Provides an easy way to map URLs to classes. URLs can be literal
* strings or regular expressions.
*
* When the URLs are processed:
* * delimiter (/) are automatically escaped: (\/)
* * The beginning and end are anchored (^ $)
* * An optional end slash is added (/?)
* * The i option is added for case-insensitive searches
*
* Example:
*
* $urls = array(
* '/' => 'index',
* '/page/(\d+) => 'page'
* );
*
* class page {
* function GET($matches) {
* echo "Your requested page " . $matches[1];
* }
* }
*
* glue::stick($urls);
*
*/
class glue {
/**
* stick
*
* the main static function of the glue class.
*
* @param array $urls The regex-based url to class mapping
* @throws Exception Thrown if corresponding class is not found
* @throws Exception Thrown if no match is found
* @throws BadMethodCallException Thrown if a corresponding GET,POST is not found
*
*/
static function stick ($urls) {
$method = strtoupper($_SERVER['REQUEST_METHOD']);
$path = $_SERVER['REQUEST_URI'];
$found = false;
krsort($urls);
foreach ($urls as $regex => $class) {
$regex = str_replace('/', '\/', $regex);
$regex = '^' . $regex . '\/?$';
if (preg_match("/$regex/i", $path, $matches)) {
$found = true;
if (class_exists($class)) {
$obj = new $class;
if (method_exists($obj, $method)) {
$obj->$method($matches);
} else {
throw new BadMethodCallException("Method, $method, not supported.");
}
} else {
throw new Exception("Class, $class, not found.");
}
break;
}
}
if (!$found) {
throw new Exception("URL, $path, not found.");
}
}
}