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<?php
/*
* This file belongs to the package "TYPO3 Fluid".
* See LICENSE.txt that was shipped with this package.
*/
namespace TYPO3Fluid\Fluid\Core\Parser\SyntaxTree;
use TYPO3Fluid\Fluid\Core\Compiler\TemplateCompiler;
use TYPO3Fluid\Fluid\Core\Parser;
use TYPO3Fluid\Fluid\Core\Rendering\RenderingContextInterface;
/**
* Abstract node in the syntax tree which has been built.
*/
abstract class AbstractNode implements NodeInterface
{
/**
* List of Child Nodes.
*
* @var NodeInterface[]
*/
protected $childNodes = [];
/**
* Evaluate all child nodes and return the evaluated results.
*
* @param RenderingContextInterface $renderingContext
* @return mixed Normally, an object is returned - in case it is concatenated with a string, a string is returned.
* @throws Parser\Exception
*/
public function evaluateChildNodes(RenderingContextInterface $renderingContext)
{
$evaluatedNodes = [];
foreach ($this->getChildNodes() as $childNode) {
$evaluatedNodes[] = $this->evaluateChildNode($childNode, $renderingContext, false);
}
// Make decisions about what to actually return
if (empty($evaluatedNodes)) {
return null;
}
if (count($evaluatedNodes) === 1) {
return $evaluatedNodes[0];
}
return implode('', array_map([$this, 'castToString'], $evaluatedNodes));
}
/**
* @param NodeInterface $node
* @param RenderingContextInterface $renderingContext
* @param bool $cast
* @return mixed
*/
protected function evaluateChildNode(NodeInterface $node, RenderingContextInterface $renderingContext, $cast)
{
$output = $node->evaluate($renderingContext);
if ($cast) {
$output = $this->castToString($output);
}
return $output;
}
/**
* @param mixed $value
* @return string
*/
protected function castToString($value)
{
if (is_object($value) && !method_exists($value, '__toString')) {
throw new Parser\Exception('Cannot cast object of type "' . get_class($value) . '" to string.', 1273753083);
}
$output = (string)$value;
return $output;
}
/**
* Returns all child nodes for a given node.
* This is especially needed to implement the boolean expression language.
*
* @return NodeInterface[] A list of nodes
*/
public function getChildNodes()
{
return $this->childNodes;
}
/**
* Appends a sub node to this node. Is used inside the parser to append children
*
* @param NodeInterface $childNode The sub node to add
*/
public function addChildNode(NodeInterface $childNode)
{
$this->childNodes[] = $childNode;
}
/**
* General implementation. Nodes that actually create output
* in compiled templates typically override this method.
*/
public function convert(TemplateCompiler $templateCompiler): array
{
return [
'initialization' => '// Uncompilable node type: ' . get_class($this) . chr(10),
'execution' => ''
];
}
}