/**
* @param Context $context
*
* @return SafeString
*/
public function render_($context)
{
return $this->nodelist->render($context);
}
/**
* @param Context $context
* @return SafeString|string
* @throws Exception|TypeError|VariableDoesNotExist
* @throws RuntimeError
*/
public function render($context)
{
if (isset($context['forloop'])) {
$parentloop = $context['forloop'];
} else {
$parentloop = array();
}
$context->push();
try {
$values = $this->sequence->resolve($context, True);
} catch (VariableDoesNotExist $e) {
$values = array();
}
if ($values === null) {
$values = array();
} elseif (is_string($values)) {
// We convert a string to array to make it iterable.
$values = str_split($values);
// TODO Check unicode handling.
}
if (!is_array($values) && !$values instanceof Iterator) {
throw new RuntimeError('Noniterable "' . $values . '" is passed to for loop.');
}
$len_values = count($values);
if ($len_values < 1) {
$context->pop();
return $this->nodelist_empty->render($context);
}
$nodelist = new NodeList();
if ($this->is_reversed) {
$values_ = $values;
krsort($values_);
$values = $values_;
unset($values_);
}
$unpack = count($this->loopvars) > 1;
// Create a forloop value in the context. We'll update counters on each iteration just below.
$loop_dict = $context['forloop'] = array('parentloop' => $parentloop);
foreach ($values as $i => $item) {
// Shortcuts for current loop iteration number.
$loop_dict['counter0'] = $i;
$loop_dict['counter'] = $i + 1;
// Reverse counter iteration numbers.
$loop_dict['revcounter'] = $len_values - $i;
$loop_dict['revcounter0'] = $len_values - $i - 1;
// Boolean values designating first and last times through loop.
$loop_dict['first'] = $i == 0;
$loop_dict['last'] = $i == $len_values - 1;
$context['forloop'] = array_merge($context['forloop'], $loop_dict);
$pop_context = False;
if ($unpack) {
// If there are multiple loop variables, unpack the item into them.
$success_ = True;
try {
$unpacked_vars = py_zip($this->loopvars, $item);
} catch (TypeError $e) {
$success_ = False;
}
if ($success_) {
$pop_context = True;
$context->update($unpacked_vars);
}
} else {
$context[$this->loopvars[0]] = $item;
}
// In TEMPLATE_DEBUG mode provide source of the node which actually raised the exception
if (Dja::getSetting('TEMPLATE_DEBUG')) {
foreach ($this->nodelist_loop as $node) {
/** @var $node Node */
try {
$nodelist[] = $node->render($context);
} catch (Exception $e) {
if (!py_hasattr($e, 'django_template_source')) {
$e->django_template_source = $node->source;
}
throw $e;
}
}
} else {
foreach ($this->nodelist_loop as $node) {
$nodelist[] = $node->render($context);
}
}
if ($pop_context) {
/*
* The loop variables were pushed on to the context so pop them
* off again. This is necessary because the tag lets the length
* of loopvars differ to the length of each set of items and we
* don't want to leave any vars from the previous loop on the
* context.
*/
$context->pop();
}
}
$context->pop();
return $nodelist->render($context);
}
