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<?php
namespace exTpl;
/**
* ConditionNode represents a single condition tag:
* "{if CONDITION}...{else}...{endif}".
*/
class ConditionNode extends ArrayNode
{
protected Expression $condition;
protected ArrayNode|null $else_node = null;
/**
* Initializes a new Node instance with the given expression.
*
* @param Expression $condition expression object
*/
public function __construct(Expression $condition)
{
$this->condition = $condition;
}
/**
* Adds an else block to this condition node.
*/
public function addElse(): void
{
$this->else_node = new ArrayNode();
}
/**
* Adds a child node to this condition node.
*
* @param Node $node child node to add
*/
public function addChild(Node $node): void
{
if ($this->else_node) {
$this->else_node->addChild($node);
} else {
parent::addChild($node);
}
}
/**
* Returns a string representation of this node.
*
* @param Context $context symbol table
*/
public function render(Context $context): string
{
if ($this->condition->value($context)) {
return parent::render($context);
}
return $this->else_node ? $this->else_node->render($context) : '';
}
}
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