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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\Rendering\RenderingContextInterface;
/**
* Node in the syntax tree.
*/
interface NodeInterface
{
/**
* 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.
*/
public function evaluateChildNodes(RenderingContextInterface $renderingContext);
/**
* Returns all child nodes for a given node.
*
* @return array<\TYPO3Fluid\Fluid\Core\Parser\SyntaxTree\NodeInterface> A list of nodes
*/
public function getChildNodes();
/**
* 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);
/**
* Evaluates the node - can return not only strings, but arbitary objects.
*
* @param RenderingContextInterface $renderingContext
* @return mixed Evaluated node
*/
public function evaluate(RenderingContextInterface $renderingContext);
/**
* Compile the Node to a PHP representation, returning an array with
* exactly two keys which contain strings:
*
* - "initialization" contains PHP code which is inserted *before* the actual
* rendering call. Must be valid, i.e. end with semicolon.
* - "execution" contains *a single PHP instruction* which needs to return the
* rendered output of the given element. Should NOT end with semicolon.
*
* @return array{initialization: string, execution: string|number}
* @internal There is a rather "hard" list of nodes within Fluid that are
* only hard to override by changing TemplateParser. As such,
* it's usually not needed to add new nodes that need different
* convert() processing at compile time.
*/
public function convert(TemplateCompiler $templateCompiler): array;
}