66 lines
1.2 KiB
PHP
66 lines
1.2 KiB
PHP
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<?php
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/**
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* @copyright Copyright 2024 Daniel Pimley
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* @license https://github.com/xenocrat/chyrp-markdown/blob/master/LICENSE
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* @link https://github.com/xenocrat/chyrp-markdown#readme
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*/
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namespace xenocrat\markdown\inline;
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/**
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* Adds math expression (LaTeX) inline elements.
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*/
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trait MathTrait
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{
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protected function parseMathMarkers(): array
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{
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return array('$`');
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}
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/**
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* Parses the math feature.
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*
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* @marker $`
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*/
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protected function parseMath($text): array
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{
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if (
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preg_match(
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'/^\$`(.*?[^\\\\])`\$/s',
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$text,
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$matches
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)
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) {
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$math = str_replace("\n", ' ', $matches[1]);
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if (
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strlen($math) > 2
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&& ltrim($math, ' ') !== ''
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&& substr($math, 0, 1) === ' '
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&& substr($math, -1) === ' '
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) {
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$math = substr($math, 1, -1);
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}
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return [
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[
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'inlineMath',
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$math
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],
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strlen($matches[0])
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];
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}
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return [['text', $text[0] . $text[1]], 2];
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}
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protected function renderInlineMath($block): string
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{
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return '<la-tex display="inline">'
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. $this->escapeHtmlEntities(
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$block[1],
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ENT_COMPAT | ENT_SUBSTITUTE
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)
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. '</la-tex>';
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}
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abstract protected function escapeHtmlEntities($text, $flags = 0);
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}
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