LaTex Fluid Parser

LaTexParser.php

<?php
/**
 * (c) by Reelworx GmbH, Markus Klein <markus.klein@reelworx.at>
 *
 * License GPL 3
 */

namespace Reelworx\LatexFluid;

use TYPO3\CMS\Fluid\Core\Parser\SyntaxTree\AbstractNode;
use TYPO3\CMS\Fluid\Core\Parser\SyntaxTree\TextNode;
use TYPO3\CMS\Fluid\Core\Parser\TemplateParser;

/**
 * Dedicated parser for LaTex files
 *
 * This parser replaces the { and } characters for inline syntax by the delimiters defined in $inlineDelimiters
 */
class LaTexParser extends TemplateParser
{
    /**
     * @var array
     */
    protected static $inlineDelimiters = ['|','§'];

    /**
     * Modify regular expressions of parent
     */
    public function __construct()
    {
        parent::__construct();

        // quote the delimiters for regex
        $escapedDelimiters = array_map(function($v) { return preg_quote($v); }, self::$inlineDelimiters);

        static::$SPLIT_PATTERN_SHORTHANDSYNTAX = str_replace(['{','}'], $escapedDelimiters, static::$SPLIT_PATTERN_SHORTHANDSYNTAX);
        static::$SCAN_PATTERN_SHORTHANDSYNTAX_OBJECTACCESSORS = str_replace(['{','}'], $escapedDelimiters, static::$SCAN_PATTERN_SHORTHANDSYNTAX_OBJECTACCESSORS);
        static::$SPLIT_PATTERN_SHORTHANDSYNTAX_VIEWHELPER = str_replace(['{','}'], $escapedDelimiters, static::$SPLIT_PATTERN_SHORTHANDSYNTAX_VIEWHELPER);
        static::$SCAN_PATTERN_SHORTHANDSYNTAX_ARRAYS = str_replace(['{','}'], $escapedDelimiters, static::$SCAN_PATTERN_SHORTHANDSYNTAX_ARRAYS);
        static::$SPLIT_PATTERN_SHORTHANDSYNTAX_ARRAY_PARTS = str_replace(['{','}'], $escapedDelimiters, static::$SPLIT_PATTERN_SHORTHANDSYNTAX_ARRAY_PARTS);
    }

    /**
     * Build up an argument object tree for the string in $argumentString.
     * This builds up the tree for a single argument value.
     *
     * This method also does some performance optimizations, so in case
     * no { or < is found, then we just return a TextNode.
     *
     * @param string $argumentString
     * @return AbstractNode the corresponding argument object tree.
     */
    protected function buildArgumentObjectTree($argumentString)
    {
        if (strpos($argumentString, static::$inlineDelimiters[0]) === false && strpos($argumentString, '<') === false) {
            return $this->objectManager->get(TextNode::class, $argumentString);
        }
        $splitArgument = $this->splitTemplateAtDynamicTags($argumentString);
        $rootNode = $this->buildObjectTree($splitArgument, self::CONTEXT_INSIDE_VIEWHELPER_ARGUMENTS)->getRootNode();
        return $rootNode;
    }
}

LaTexView.php

<?php
/**
 * (c) by Reelworx GmbH, Markus Klein <markus.klein@reelworx.at>
 *
 * License GPL 3
 */

namespace Reelworx\LatexFluid;

use TYPO3\CMS\Fluid\View\StandaloneView;
use TYPO3\CMS\Frontend\ContentObject\ContentObjectRenderer;

/**
 * Special view to render LaTex files
 *
 * This view explicitly uses the LaTexParser to parse templates.
 */
class LaTexView extends StandaloneView
{
    /**
     * @param ContentObjectRenderer $contentObject
     */
    public function __construct(ContentObjectRenderer $contentObject)
    {
        parent::__construct($contentObject);
        $this->templateParser = $this->objectManager->get(LaTexParser::class);
        $this->setFormat('tex');
    }
}

Usage.php

<?php

/* partial code only */

class MyController {
  public function someAction()
  {
    $view = GeneralUtility::makeInstance(LaTexView::class, $GLOBALS['TSFE']->cObj);
    $view->setTemplateSource('
    \textbf{|title§}
            
    <f:for each="|names§" as="n">|n§
    </f:for>
    |f:if(condition:ahoi,then:\'-->> yes <<--\')§
    ');
    
    $view->assign('title', 'Words');
    $view->assign('ahoi', true);
    $view->assign('names', ['I', 'you', 'he']);
}