1<?php
2/**
3 * @copyright Copyright (c) 2014 Carsten Brandt
4 * @license https://github.com/cebe/markdown/blob/master/LICENSE
5 * @link https://github.com/cebe/markdown#readme
6 */
7
8namespace cebe\markdown\block;
9
10/**
11 * Adds the fenced code blocks
12 *
13 * automatically included 4 space indented code blocks
14 */
15trait FencedCodeTrait
16{
17	use CodeTrait;
18
19	/**
20	 * identify a line as the beginning of a fenced code block.
21	 */
22	protected function identifyFencedCode($line)
23	{
24		return ($line[0] === '`' && strncmp($line, '```', 3) === 0) ||
25			   ($line[0] === '~' && strncmp($line, '~~~', 3) === 0) ||
26			   (isset($line[3]) && (
27					($line[3] === '`' && strncmp(ltrim($line), '```', 3) === 0) ||
28					($line[3] === '~' && strncmp(ltrim($line), '~~~', 3) === 0)
29			   ));
30	}
31
32	/**
33	 * Consume lines for a fenced code block
34	 */
35	protected function consumeFencedCode($lines, $current)
36	{
37		$line = ltrim($lines[$current]);
38		$fence = substr($line, 0, $pos = strrpos($line, $line[0]) + 1);
39		$language = rtrim(substr($line, $pos));
40		// consume until end fence
41		$content = [];
42		for ($i = $current + 1, $count = count($lines); $i < $count; $i++) {
43			if (($pos = strpos($line = $lines[$i], $fence)) === false || $pos > 3) {
44				$content[] = $line;
45			} else {
46				break;
47			}
48		}
49		$block = [
50			'code',
51			'content' => implode("\n", $content),
52		];
53		if (!empty($language)) {
54			$block['language'] = $language;
55		}
56		return [$block, $i];
57	}
58}
59