leilukin-tumbleblog/includes/lib/xenocrat/markdown/GithubMarkdown.php

145 lines
3.1 KiB
PHP

<?php
/**
* @copyright Copyright 2014 Carsten Brandt, 2024 Daniel Pimley
* @license https://github.com/xenocrat/chyrp-markdown/blob/master/LICENSE
* @link https://github.com/xenocrat/chyrp-markdown#readme
*/
namespace xenocrat\markdown;
/**
* Markdown parser for GitHub-Flavored Markdown.
*
* @see https://github.github.com/gfm/
* @author Carsten Brandt
* @author Daniel Pimley
*/
class GithubMarkdown extends Markdown
{
// Include block element parsing using traits.
use block\TableTrait;
// Include inline element parsing using traits.
use inline\AutoLinkTrait;
use inline\CheckboxTrait;
use inline\StrikeoutTrait;
/**
* @inheritDoc
*/
protected $blockPriorities = [
'Hr',
'Ul',
'Code',
'FencedCode',
'Html',
'Ol',
'Quote',
'Reference',
'Table',
'Headline',
];
/**
* @var boolean Whether to interpret newlines as `<br />` tags.
*
* This feature is useful for comments where newlines are often
* meant to be hard line breaks.
*/
public $enableNewlines = false;
/**
* @var boolean Whether to sanitize disallowed raw HTML tags.
*
* This toggles section 6.11 of the GFM specification on or off.
*/
public $disallowedRawHTML = true;
/**
* @var array Disallowed HTML elements defined in GFM spec
* @see https://github.github.com/gfm/#disallowed-raw-html-extension-
*/
protected $disallowedRawHTMLElements = [
'iframe',
'noembed',
'noframes',
'plaintext',
'script',
'style',
'title',
'textarea',
'xmp',
];
/**
* @inheritDoc
*/
protected function consumeParagraph($lines, $current): array
{
$content = [];
// Consume until blank line or end condition...
for ($i = $current, $count = count($lines); $i < $count; $i++) {
$line = $lines[$i];
if (
$line === ''
|| ($trimmed = ltrim($line)) === ''
|| (
(ctype_punct($trimmed[0]) || ctype_digit($trimmed[0]))
&& (
$this->identifyQuote($line, $lines, $i)
|| $this->identifyFencedCode($line, $lines, $i)
|| $this->identifyUl($line, $lines, $i)
|| $this->identifyOl($line, $lines, $i)
|| $this->identifyHr($line, $lines, $i)
|| $this->identifyHtml($line, $lines, $i)
)
)
|| $this->identifyHeadline($line, $lines, $i)
) {
break;
} else {
$content[] = ltrim($line);
}
}
$block = [
'paragraph',
'content' => $this->parseInline(trim(implode("\n", $content))),
];
return [$block, --$i];
}
/**
* @inheritDoc
*
* Parses all newlines as hard line breaks if `enableNewlines` is set.
*/
protected function renderText($text): string
{
if ($this->enableNewlines) {
$br = $this->html5 ? "<br>\n" : "<br />\n";
$text[1] = preg_replace("/ *\n/", $br, $text[1]);
}
return parent::renderText($text);
}
/**
* @inheritDoc
*
* Sanitize disallowed raw HTML tags, then post-process markup.
*/
protected function postprocess($markup): string
{
if ($this->disallowedRawHTML) {
$patterns = implode('|', $this->disallowedRawHTMLElements);
$markup = preg_replace(
"/<($patterns)(\s|>|\/>)/i",
"&lt;$1$2",
$markup
);
}
return parent::postprocess($markup);
}
}