81 lines
1.9 KiB
PHP
81 lines
1.9 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\block;
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/**
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* Adds front matter blocks.
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*/
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trait FrontMatterTrait
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{
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/**
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* @var bool - Render front matter as a code block.
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*/
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public $renderFrontMatter = true;
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/**
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* Identify a line as the beginning of a front matter block.
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*/
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protected function identifyFrontMatter($line): bool
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{
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return (
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preg_match('/^ {0,3};{3,}[^;]*$/', $line)
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|| preg_match('/^ {0,3}\-{3,}[^\-]*$/', $line)
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|| preg_match('/^ {0,3}\+{3,}[^\+]*$/', $line)
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);
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}
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/**
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* Consume lines for a front matter block.
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*/
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protected function consumeFrontMatter($lines, $current): array
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{
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$indent = strspn($lines[$current], ' ');
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$line = substr($lines[$current], $indent);
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$mw = strspn($line, $line[0]);
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$fence = substr($line, 0, $mw);
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$language = trim(substr($line, $mw));
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$content = [];
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// Consume until end fence...
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for ($i = $current + 1, $count = count($lines); $i < $count; $i++) {
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$line = $lines[$i];
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$leadingSpaces = strspn($line, ' ');
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if (
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$leadingSpaces > 3
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|| strspn(ltrim($line), $fence[0]) < $mw
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|| !str_ends_with(rtrim($line), $fence[0])
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) {
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if ($indent > 0 && $leadingSpaces > 0) {
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if ($leadingSpaces < $indent) {
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$line = ltrim($line);
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} else {
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$line = substr($line, $indent);
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}
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}
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$content[] = $line;
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} else {
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break;
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}
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}
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$block = [
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'code',
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'content' => implode("\n", $content),
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];
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if ($language !== '') {
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if (preg_match('/^[^ ]+/', $language, $match)) {
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$block['language'] = $this->unEscapeBackslash($match[0]);
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}
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}
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return [($this->renderFrontMatter) ? $block : false, $i];
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}
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abstract protected function renderCode($block);
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abstract protected function unEscapeBackslash($text);
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}
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