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<?php
declare(strict_types=1);
/*
* This file is part of the TYPO3 CMS project.
*
* It is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License, either version 2
* of the License, or any later version.
*
* For the full copyright and license information, please read the
* LICENSE.txt file that was distributed with this source code.
*
* The TYPO3 project - inspiring people to share!
*/
namespace TYPO3\CMS\Core\TypoScript\AST;
use Psr\EventDispatcher\EventDispatcherInterface;
use TYPO3\CMS\Core\TypoScript\AST\CurrentObjectPath\CurrentObjectPath;
use TYPO3\CMS\Core\TypoScript\AST\CurrentObjectPath\CurrentObjectPathStack;
use TYPO3\CMS\Core\TypoScript\AST\Node\RootNode;
use TYPO3\CMS\Core\TypoScript\Tokenizer\Line\BlockCloseLine;
use TYPO3\CMS\Core\TypoScript\Tokenizer\Line\IdentifierAssignmentLine;
use TYPO3\CMS\Core\TypoScript\Tokenizer\Line\IdentifierBlockOpenLine;
use TYPO3\CMS\Core\TypoScript\Tokenizer\Line\IdentifierCopyLine;
use TYPO3\CMS\Core\TypoScript\Tokenizer\Line\IdentifierFunctionLine;
use TYPO3\CMS\Core\TypoScript\Tokenizer\Line\IdentifierReferenceLine;
use TYPO3\CMS\Core\TypoScript\Tokenizer\Line\IdentifierUnsetLine;
use TYPO3\CMS\Core\TypoScript\Tokenizer\Line\LineStream;
use TYPO3\CMS\Core\TypoScript\Tokenizer\Token\ConstantAwareTokenStream;
/**
* The main TypoScript AST builder.
*
* This creates a tree of Nodes, starting with the root node. Each node can have
* children. The implementation basically iterates a LineStream created by the
* tokenizers, and creates AST depending on the line type. It handles all the
* different operator lines like "=", "<" and so on.
*
* @internal: Internal AST structure.
*/
final class AstBuilder extends AbstractAstBuilder implements AstBuilderInterface
{
public function __construct(
EventDispatcherInterface $eventDispatcher,
) {
$this->eventDispatcher = $eventDispatcher;
}
/**
* @param array<string, string> $flatConstants
*/
public function build(LineStream $lineStream, RootNode $ast, array $flatConstants = []): RootNode
{
$this->flatConstants = $flatConstants;
$currentObjectPath = new CurrentObjectPath($ast);
$currentObjectPathStack = new CurrentObjectPathStack();
$currentObjectPathStack->push($currentObjectPath);
foreach ($lineStream->getNextLine() as $line) {
if ($line instanceof IdentifierAssignmentLine) {
// "foo = bar" and "foo ( bar )": Single and multi line assignments
$this->handleIdentifierAssignmentLine($line, $currentObjectPath);
} elseif ($line instanceof IdentifierBlockOpenLine) {
// "foo {": Opening a block - push to object path stack
$node = $this->getOrAddNodeFromIdentifierStream($currentObjectPath, $line->getIdentifierTokenStream());
$currentObjectPath = (new CurrentObjectPath($node));
$currentObjectPathStack->push($currentObjectPath);
} elseif ($line instanceof BlockCloseLine) {
// "}": Closing a block - pop from object path stack
$currentObjectPath = $currentObjectPathStack->pop();
} elseif ($line instanceof IdentifierUnsetLine) {
// "foo >": Remove a path
$this->handleIdentifierUnsetLine($line, $currentObjectPath);
} elseif ($line instanceof IdentifierCopyLine) {
// "foo < bar": Copy a node source path to a target path
$this->handleIdentifierCopyLine($line, $ast, $currentObjectPath);
} elseif ($line instanceof IdentifierFunctionLine) {
// "foo := addToList(42)": Evaluate functions
$node = $this->getOrAddNodeFromIdentifierStream($currentObjectPath, $line->getIdentifierTokenStream());
$node->setValue($this->evaluateValueModifier($line->getFunctionNameToken(), $line->getFunctionValueToken(), $node->getValue()));
} elseif ($line instanceof IdentifierReferenceLine) {
// "foo =< bar": Prepare a reference resolving
$this->handleIdentifierReferenceLine($line, $currentObjectPath);
}
}
return $ast;
}
private function handleIdentifierAssignmentLine(IdentifierAssignmentLine $line, CurrentObjectPath $currentObjectPath): void
{
$node = $this->getOrAddNodeFromIdentifierStream($currentObjectPath, $line->getIdentifierTokenStream());
$valueTokenStream = $line->getValueTokenStream();
if ($valueTokenStream instanceof ConstantAwareTokenStream) {
$valueTokenStream->setFlatConstants($this->flatConstants);
$node->setValue((string)$valueTokenStream);
$valueTokenStream->setFlatConstants(null);
$node->setOriginalValueTokenStream($valueTokenStream);
return;
}
$node->setValue((string)$valueTokenStream);
}
}