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<?php
namespace exTpl;
/**
* IteratorNode represents a single iterator tag:
* "{foreach ARRAY [as [KEY =>] VALUE]}...{endforeach}".
*/
class IteratorNode extends ArrayNode
{
protected Expression $expr;
protected string $key_name;
protected string $val_name;
/**
* Initializes a new Node instance with the given expression.
*
* @param Expression $expr expression object
* @param string $key_name name of variable on each iteration
* @param string $val_name name of variable on each iteration
*/
public function __construct(Expression $expr, string $key_name, string $val_name)
{
$this->expr = $expr;
$this->key_name = $key_name;
$this->val_name = $val_name;
}
/**
* Returns a string representation of this node. The IteratorNode
* renders the node sequence for each value in the expression list.
*
* @param Context $context symbol table
*/
public function render(Context $context): string
{
$values = $this->expr->value($context);
$result = '';
if (is_array($values) && is_int(key($values))) {
$bindings = [$this->key_name => &$key, $this->val_name => &$value];
$context = new Context($bindings, $context);
foreach ($values as $key => $value) {
$result .= parent::render(new Context($value, $context));
}
} else if (is_array($values) && count($values)) {
return parent::render(new Context($values, $context));
} else if ($values) {
return parent::render($context);
}
return $result;
}
}
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