/**
* Build RouteRegex from Route.
*
* @param Route $route
*
* @return RouteRegex
*/
public static function create(Route $route)
{
$matches = array();
$tokens = array();
$variables = array();
$pattern = $route->getPath();
$pos = 0;
// match all variables between variable prefix and suffix.
preg_match_all(self::getVariablePattern(), $pattern, $matches, PREG_OFFSET_CAPTURE | PREG_SET_ORDER);
foreach ((array) $matches as $i => $match) {
$variable = substr($match[0][0], 1, -1);
$preceding = substr($pattern, $pos, $match[0][1] - $pos);
$pos = $match[0][1] + strlen($match[0][0]);
$precedingChar = strlen($preceding) > 0 ? substr($preceding, -1) : '';
$isSeparator = '' !== $precedingChar && false !== strpos(static::SEPARATORS, $precedingChar);
if (is_numeric($variable)) {
throw new InvalidArgumentException(sprintf('Variable name "%s" must be string.', $variable));
}
if (in_array($variable, $variables)) {
throw new InvalidArgumentException(sprintf('Variable name "%s" can\'t define more than once.', $variable));
}
if ($isSeparator && strlen($preceding) > 1) {
$tokens[] = array('type' => 'text', 'path' => substr($preceding, 0, -1));
} elseif (!$isSeparator && strlen($preceding) > 0) {
$tokens[] = array('type' => 'text', 'path' => $preceding);
}
$regex = $route->getRequirementBag()->get($variable);
if (null === $regex) {
$regex = '[^/]++';
}
$tokens[] = array('type' => 'variable', 'preceding' => $isSeparator ? $precedingChar : '', 'regex' => $regex, 'variable' => $variable);
$variables[] = $variable;
}
if ($pos < strlen($pattern)) {
$tokens[] = array('type' => 'text', 'path' => substr($pattern, $pos));
}
$numberOfToken = count($tokens);
$lastToken = $tokens[$numberOfToken - 1];
$optionalIndex = -1;
if ('variable' === $lastToken['type'] && $route->getDefaultBag()->has($lastToken['variable'])) {
$optionalIndex = $numberOfToken - 1;
}
$regex = '';
foreach ($tokens as $i => $token) {
$regex .= self::buildRegex($token, $i, $optionalIndex);
}
return new RouteRegex(sprintf('%s^%s$%ss', static::$regexDelimiter, $regex, static::$regexDelimiter), $variables, $tokens);
}
