= 4 or one tab is code. return $line[0] === "\t" || strncmp($line, ' ', 4) === 0; } /** * Consume lines for a code block element. */ protected function consumeCode($lines, $current): array { $content = []; // Consume until end of markers... for ($i = $current, $count = count($lines); $i < $count; $i++) { $line = $lines[$i]; if (isset($line[0]) && $line[0] === "\t") { // A line belongs to this code block if indented by a tab. $line = substr($line, 1); $content[] = $line; } elseif (str_starts_with($line, ' ')) { // A line belongs to this code block if indented by 4 spaces. $line = substr($line, 4); $content[] = $line; } elseif ( ($line === '' || ltrim($line) === '') && isset($lines[$i + 1]) ) { // ...Or if blank and the next is also blank // or the next is indented by 4 spaces or a tab. $next = $lines[$i + 1]; if ( $next === '' || ltrim($next) === '' || $next[0] === "\t" || str_starts_with($next, ' ') ) { $line = ''; $content[] = $line; } else { break; } } else { break; } } // Remove leading blank lines. while ( count($content) > 1 && ltrim(reset($content)) === '' ) { array_shift($content); } // Remove trailing blank lines. while ( count($content) > 1 && ltrim(end($content)) === '' ) { array_pop($content); } $block = [ 'code', 'content' => implode("\n", $content), ]; return [$block, --$i]; } /** * Renders a code block. */ protected function renderCode($block): string { $class = isset($block['language']) ? ' class="language-' . $block['language'] . '"' : ''; return "

"
			. $this->escapeHtmlEntities(
				$block['content'],
				ENT_COMPAT | ENT_SUBSTITUTE
			)
			. ($block['content'] === '' ? '' : "\n" )
			. "

\n"; } abstract protected function escapeHtmlEntities($text, $flags = 0); }