decalog / includes / libraries / markdown / block / HtmlTrait.php

HtmlTrait.php in DecaLog 4.4.0, at includes/libraries/markdown/block/HtmlTrait.php

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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
8	namespace cebe\markdownparser\block;
9
10	/**
11	* Adds inline and block HTML support
12	*/
13	trait HtmlTrait
14	{
15	/**
16	* @var array HTML elements considered as inline elements.
17	* @see http://www.w3.org/wiki/HTML/Elements#Text-level_semantics
18	*/
19	protected $inlineHtmlElements = [
20	'a', 'abbr', 'acronym',
21	'b', 'basefont', 'bdo', 'big', 'br', 'button', 'blink',
22	'cite', 'code',
23	'del', 'dfn',
24	'em',
25	'font',
26	'i', 'img', 'ins', 'input', 'iframe',
27	'kbd',
28	'label', 'listing',
29	'map', 'mark',
30	'nobr',
31	'object',
32	'q',
33	'rp', 'rt', 'ruby',
34	's', 'samp', 'script', 'select', 'small', 'spacer', 'span', 'strong', 'sub', 'sup',
35	'tt', 'var',
36	'u',
37	'wbr',
38	'time',
39	];
40	/**
41	* @var array HTML elements known to be self-closing.
42	*/
43	protected $selfClosingHtmlElements = [
44	'br', 'hr', 'img', 'input', 'nobr',
45	];
46
47	/**
48	* identify a line as the beginning of a HTML block.
49	*/
50	protected function identifyHtml($line, $lines, $current)
51	{
52	if ($line[0] !== '<' \|\| isset($line[1]) && $line[1] == ' ') {
53	return false; // no html tag
54	}
55
56	if (strncmp($line, '<!--', 4) === 0) {
57	return true; // a html comment
58	}
59
60	$gtPos = strpos($lines[$current], '>');
61	$spacePos = strpos($lines[$current], ' ');
62	if ($gtPos === false && $spacePos === false) {
63	return false; // no html tag
64	} elseif ($spacePos === false) {
65	$tag = rtrim(substr($line, 1, $gtPos - 1), '/');
66	} else {
67	$tag = rtrim(substr($line, 1, min($gtPos, $spacePos) - 1), '/');
68	}
69
70	if (!ctype_alnum($tag) \|\| in_array(strtolower($tag), $this->inlineHtmlElements)) {
71	return false; // no html tag or inline html tag
72	}
73	return true;
74	}
75
76	/**
77	* Consume lines for an HTML block
78	*/
79	protected function consumeHtml($lines, $current)
80	{
81	$content = [];
82	if (strncmp($lines[$current], '<!--', 4) === 0) { // html comment
83	for ($i = $current, $count = count($lines); $i < $count; $i++) {
84	$line = $lines[$i];
85	$content[] = $line;
86	if (strpos($line, '-->') !== false) {
87	break;
88	}
89	}
90	} else {
91	$tag = rtrim(substr($lines[$current], 1, min(strpos($lines[$current], '>'), strpos($lines[$current] . ' ', ' ')) - 1), '/');
92	$level = 0;
93	if (in_array($tag, $this->selfClosingHtmlElements)) {
94	$level--;
95	}
96	for ($i = $current, $count = count($lines); $i < $count; $i++) {
97	$line = $lines[$i];
98	$content[] = $line;
99	$level += substr_count($line, "<$tag") - substr_count($line, "</$tag>") - substr_count($line, "/>");
100	if ($level <= 0) {
101	break;
102	}
103	}
104	}
105	$block = [
106	'html',
107	'content' => implode("\n", $content),
108	];
109	return [$block, $i];
110	}
111
112	/**
113	* Renders an HTML block
114	*/
115	protected function renderHtml($block)
116	{
117	return $block['content'] . "\n";
118	}
119
120	/**
121	* Parses an & or a html entity definition.
122	* @marker &
123	*/
124	protected function parseEntity($text)
125	{
126	// html entities e.g. © © ©
127	if (preg_match('/^&#?[\w\d]+;/', $text, $matches)) {
128	return [['inlineHtml', $matches[0]], strlen($matches[0])];
129	} else {
130	return [['text', '&'], 1];
131	}
132	}
133
134	/**
135	* renders a html entity.
136	*/
137	protected function renderInlineHtml($block)
138	{
139	return $block[1];
140	}
141
142	/**
143	* Parses inline HTML.
144	* @marker <
145	*/
146	protected function parseInlineHtml($text)
147	{
148	if (strpos($text, '>') !== false) {
149	if (preg_match('~^</?(\w+\d?)( .*?)?>~s', $text, $matches)) {
150	// HTML tags
151	return [['inlineHtml', $matches[0]], strlen($matches[0])];
152	} elseif (preg_match('~^<!--.*?-->~s', $text, $matches)) {
153	// HTML comments
154	return [['inlineHtml', $matches[0]], strlen($matches[0])];
155	}
156	}
157	return [['text', '<'], 1];
158	}
159
160	/**
161	* Escapes `>` characters.
162	* @marker >
163	*/
164	protected function parseGt($text)
165	{
166	return [['text', '>'], 1];
167	}
168	}
169