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vendor/cebe/markdown/block/HeadlineTrait.php

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+<?php
+/**
+ * @copyright Copyright (c) 2014 Carsten Brandt
+ * @license https://github.com/cebe/markdown/blob/master/LICENSE
+ * @link https://github.com/cebe/markdown#readme
+ */
+
+namespace cebe\markdown\block;
+
+/**
+ * Adds the headline blocks
+ */
+trait HeadlineTrait
+{
+	/**
+	 * identify a line as a headline
+	 */
+	protected function identifyHeadline($line, $lines, $current)
+	{
+		return (
+			// heading with #
+			$line[0] === '#' && !preg_match('/^#\d+/', $line)
+			||
+			// underlined headline
+			!empty($lines[$current + 1]) &&
+			(($l = $lines[$current + 1][0]) === '=' || $l === '-') &&
+			preg_match('/^(\-+|=+)\s*$/', $lines[$current + 1])
+		);
+	}
+
+	/**
+	 * Consume lines for a headline
+	 */
+	protected function consumeHeadline($lines, $current)
+	{
+		if ($lines[$current][0] === '#') {
+			// ATX headline
+			$level = 1;
+			while (isset($lines[$current][$level]) && $lines[$current][$level] === '#' && $level < 6) {
+				$level++;
+			}
+			$block = [
+				'headline',
+				'content' => $this->parseInline(trim($lines[$current], "# \t")),
+				'level' => $level,
+			];
+			return [$block, $current];
+		} else {
+			// underlined headline
+			$block = [
+				'headline',
+				'content' => $this->parseInline($lines[$current]),
+				'level' => $lines[$current + 1][0] === '=' ? 1 : 2,
+			];
+			return [$block, $current + 1];
+		}
+	}
+
+	/**
+	 * Renders a headline
+	 */
+	protected function renderHeadline($block)
+	{
+		$tag = 'h' . $block['level'];
+		return "<$tag>" . $this->renderAbsy($block['content']) . "</$tag>\n";
+	}
+
+	abstract protected function parseInline($text);
+	abstract protected function renderAbsy($absy);
+}