/**
* Tag {cycle}
*
* @param Tokenizer $tokens
* @param Template $tpl
* @return string
* @throws InvalidUsageException
*/
public static function tagCycle(Tokenizer $tokens, Template $tpl)
{
if ($tokens->is("[")) {
$exp = $tpl->parseArray($tokens);
} else {
$exp = $tpl->parseExpr($tokens);
}
if ($tokens->valid()) {
$p = $tpl->parseParams($tokens);
if (empty($p["index"])) {
throw new InvalidUsageException("Cycle may contain only index attribute");
} else {
return 'echo ' . __CLASS__ . '::cycle(' . $exp . ', ' . $p["index"] . ')';
}
} else {
$var = $tpl->tmpVar();
return 'echo ' . __CLASS__ . '::cycle(' . $exp . ", isset({$var}) ? ++{$var} : ({$var} = 0) )";
}
}
