7u83/processwire-TextformatterLatexMathML
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7u83 2023-11-25 14:54:50 +01:00
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<?php
/*
Copyright (C) 2023 by 7u83 7u83@mail.ru
Permission to use, copy, modify, and/or distribute this software
for any purpose with or without fee is hereby granted.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE
*/
namespace ProcessWire;
class TextFormatterLatexMathML extends Textformatter {
public static function getModuleInfo() {
return array(
'title' => 'LatexMathML Text Formatter',
'version' => '1.0.0',
'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'),
);
}
public function format(&$str) {
// Regular expression to match LaTeX formulas within $ symbols
$latexPattern = '/(?<!\\\\)\$([^$\\\\]*(\\\\.[^$\\\\]*)*)\$/';
$inputString = $str;
// Create a DOMDocument object
$dom = new \DOMDocument('1.0', 'UTF-8');
// Load the HTML string into the DOMDocument
$dom->loadHTML('<?xml encoding="utf-8" ?><html>'.$inputString.'</html>', LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD);
// Create a DOMXPath object to navigate the DOMDocument
$xpath = new \DOMXPath($dom);
// Find all <p>, <div>, <span> ... 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);
// 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('<html>','</html>') , '' , $dom->saveHTML($dom->documentElement));
}
// Define a callback function to convert the matched formula to MathML
function convertToMathML($matches) {
$cache = wire('cache');
// $matches[1] contains the matched substring within '$'
$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 -';
$inputString = '$'.$formula.'$';
// 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);
return $output;
}
}