'LatexMathML Text Formatter',
'version' => '0.9.1',
'summary' => 'Replaces $latexformula$ with inline MathML',
'author' => '7u83',
'autoload' => true,
'singular' => true,
'href' => 'https://git.planix.org/7u83/processwire-TextformatterLatexMathML',
'requires' => array('ProcessWire>=3.0.0'),
);
}
function smartQuotesGermanHTML($html) {
$doc = new \DOMDocument();
libxml_use_internal_errors(true); // Verhindert Warnungen bei schlechtem HTML
$doc->loadHTML(mb_convert_encoding($html, 'HTML-ENTITIES', 'UTF-8'));
$xpath = new \DOMXPath($doc);
foreach ($xpath->query('//text()') as $textNode) {
$text = $textNode->nodeValue;
$r = $this->replaceQuotesInText($text);
$textNode->nodeValue = $r; //this->replaceQuotesInText($text);
}
// Nur extrahieren, weil DOMDocument etc. einfügt
$bodyNode = $doc->getElementsByTagName('body')->item(0);
$innerHTML = '';
foreach ($bodyNode->childNodes as $child) {
$innerHTML .= $doc->saveHTML($child);
}
return $innerHTML;
}
function replaceQuotesInText($text) {
static $isOpen = true;
$result = '';
$len = mb_strlen($text);
for ($i = 0; $i < $len; $i++) {
$char = mb_substr($text, $i, 1);
if ($char === '"') {
$result .= $isOpen ? '„' : '“';
$isOpen = !$isOpen;
} else {
$result .= $char;
}
}
return $result;
}
public function format(&$str) {
# $str = $this->smartQuotesGermanHTML($str);
# return;
// Regular expression to match LaTeX formulas within $ symbols
$latexPattern = '/(?loadHTML(''.$inputString.'', LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD);
// Create a DOMXPath object to navigate the DOMDocument
$xpath = new \DOMXPath($dom);
// Find all ,
, ... elements
$elements = $xpath->query('//p | //div | //span | //strong | //b | //i | //em');
$nodesForReplacement = array();
// Iterate through the elements and create and arraz of nodes to modify
foreach ($elements as $element) {
foreach ($element->childNodes as $node) {
if ($node->nodeType === XML_TEXT_NODE) {
// convert $formula$ to mathml
$modifiedValue = preg_replace_callback($latexPattern, array($this,'convertToMathML'), $node->nodeValue);
// unescape esaped $-signs
$modifiedValue = str_replace('\$', '$',$modifiedValue);
$modifiedValue = str_replace('&','&',$modifiedValue);
// Save the node and its modified content for later replacement
$nodesForReplacement[] = array(
'node' => $node,
'modifiedValue' => $modifiedValue
);
}
}
}
// Replace the nodes
foreach ($nodesForReplacement as $replacement) {
$fragment = $dom->createDocumentFragment();
$fragment->appendXML($replacement['modifiedValue']);
$replacement['node']->parentNode->replaceChild($fragment, $replacement['node']);
}
// Output the modified HTML
$str = str_replace(array('','') , '' , $dom->saveHTML($dom->documentElement));
}
// Define a callback function to convert the matched formula to MathML
function convertToMathML($matches) {
$cache = wire('cache');
# $cache->deleteAll();
// $matches[1] contains the matched substring within '$'
$formula = $matches[1];
$cn = "TFLatexMathML$formula";
$mathml = base64_decode($cache->get($cn));
if ($mathml)
return $mathml;
$mathml = $this->convertFormulaToMathML($formula);
$cache->save($cn,base64_encode($mathml));
// Return the processed result as the replacement
return $mathml;
}
// Function to convert a formula to MathML
function convertFormulaToMathML($formula) {
# $command = 'latexmlmath --quiet -';
#
$command = '/usr/local/bin/katex --format mathml';
# $inputString = '$'.$formula.'$';
$inputString = $formula;
// Construct the full command with the input string
$fullCommand = sprintf('echo %s | %s', escapeshellarg($inputString), $command);
// Execute the command and capture the output
$output = shell_exec($fullCommand);
$output = str_replace(' xmlns="http://www.w3.org/1998/Math/MathML"', '', $output);
return $output;
}
}