/**
* Parses a variable token and its optional filters (all as a single string),
* and return a list of tuples of the filter name and arguments.
* Sample::
*
* >>> token = 'variable|default:"Default value"|date:"Y-m-d"'
* >>> p = Parser('')
* >>> fe = FilterExpression(token, p)
* >>> len(fe.filters)
* 2
* >>> fe.var
* <Variable: 'variable'>
*
* This class should never be instantiated outside of the
* get_filters_from_token helper function.
*
* @param Token $token
* @param Parser $parser
* @throws TemplateSyntaxError
*/
public function __construct($token, $parser)
{
$this->token = $token;
$matches = new PyReFinditer(DjaBase::getReFilter(), $token);
$var_obj = null;
$filters = array();
$upto = 0;
/** @var $match pyReMatchObject */
foreach ($matches as $match) {
$start = $match->start();
if ($upto != $start) {
throw new TemplateSyntaxError('Could not parse some characters: ' . py_slice($token, null, $upto) . '|' . py_slice($token, $upto, $start) . '|' . py_slice($token, $start) . '');
}
if ($var_obj === null) {
list($var, $constant) = $match->group(array('var', 'constant'));
if ($constant) {
try {
$var_obj = new Variable($constant);
$var_obj = $var_obj->resolve(array());
} catch (VariableDoesNotExist $e) {
$var_obj = null;
}
} elseif ($var === null) {
throw new TemplateSyntaxError('Could not find variable at start of ' . $token . '.');
} else {
$var_obj = new Variable($var);
}
} else {
$filter_name = $match->group('filter_name');
$args = array();
list($constant_arg, $var_arg) = $match->group(array('constant_arg', 'var_arg'));
if (trim($constant_arg) != '') {
$tmp = new Variable($constant_arg);
$tmp = $tmp->resolve(array());
$args[] = array(False, $tmp);
unset($tmp);
} elseif (trim($var_arg) != '') {
$args[] = array(True, new Variable($var_arg));
}
$filter_func = $parser->findFilter($filter_name);
self::argsCheck($filter_name, $filter_func->closure, $args);
$filters[] = array($filter_func, $args, $filter_name);
// Deliberately add filter name as the third element (used in `filter` tag).
}
$upto = $match->end();
}
if ($upto != mb_strlen($token, 'utf-8')) {
throw new TemplateSyntaxError("Could not parse the remainder: '" . py_slice($token, $upto) . "' from '" . $token . "'");
}
$this->filters = $filters;
$this->var = $var_obj;
}
