CFF_Autolink.php — Smash Balloon Social Post Feed – Simple Social Feeds for WordPress 4.9.0

custom-facebook-feed / inc / CFF_Autolink.php

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CFF_Autolink.php

305 lines

1	<?php
2
3	/**
4	* Autolink
5	*
6	* @since 2.19
7	*/
8
9	namespace CustomFacebookFeed;
10
11	if (!defined('ABSPATH')) {
12	exit; // Exit if accessed directly
13	}
14
15	class CFF_Autolink
16	{
17	public static function cff_autolink($text = '', $link_color = '', $span_tag = false, $limit = 100, $tagfill = 'class="cff-break-word"', $auto_title = true)
18	{
19	$text = self::cff_autolink_do($text, $link_color, '![a-z][a-z-]+://!i', $limit, $tagfill, $auto_title, $span_tag);
20	$text = self::cff_autolink_do($text, $link_color, '!(mailto\|skype):!i', $limit, $tagfill, $auto_title, $span_tag);
21	$text = self::cff_autolink_do($text, $link_color, '!www\\.!i', $limit, $tagfill, $auto_title, 'http://', $span_tag);
22	return $text;
23	}
24
25	public static function cff_autolink_do($text, $link_color, $sub, $limit, $tagfill, $auto_title, $span_tag, $force_prefix = null)
26	{
27	$text_l = StrToLower($text);
28	$cursor = 0;
29	$loop = 1;
30	$buffer = '';
31
32	$autolink_options = [
33	// Should http:// be visibly stripped from the front
34	// of URLs?
35	'strip_protocols' => true,
36	];
37
38	while (($cursor < strlen($text)) && $loop) {
39	$ok = 1;
40	$matched = preg_match($sub, $text_l, $m, PREG_OFFSET_CAPTURE, $cursor);
41
42	if (!$matched) {
43	$loop = 0;
44	$ok = 0;
45	} else {
46	$pos = $m[0][1];
47	$sub_len = strlen($m[0][0]);
48
49	$pre_hit = substr($text, $cursor, $pos - $cursor);
50	$hit = substr($text, $pos, $sub_len);
51	$pre = substr($text, 0, $pos);
52	$post = substr($text, $pos + $sub_len);
53
54	$fail_text = $pre_hit . $hit;
55	$fail_len = strlen($fail_text);
56
57	//
58	// substring found - first check to see if we're inside a link tag already...
59	//
60
61	$bits = preg_split("!</a>!i", $pre);
62	$last_bit = array_pop($bits);
63	if (preg_match("!<a\s!i", $last_bit)) {
64	// echo "fail 1 at $cursor<br />\n";
65
66	$ok = 0;
67	$cursor += $fail_len;
68	$buffer .= $fail_text;
69	}
70	}
71
72	//
73	// looks like a nice spot to autolink from - check the pre
74	// to see if there was whitespace before this match
75	//
76
77	if ($ok) {
78	if ($pre) {
79	if (!preg_match('![\s\(\[\{>]$!s', $pre)) {
80	// echo "fail 2 at $cursor ($pre)<br />\n";
81
82	$ok = 0;
83	$cursor += $fail_len;
84	$buffer .= $fail_text;
85	}
86	}
87	}
88
89	//
90	// we want to autolink here - find the extent of the url
91	//
92
93	if ($ok) {
94	if (preg_match('/^([a-z0-9\-\.\/\-_%~!?=,:;&+*#@\$]+)/i', $post, $matches)) {
95	$url = $hit . $matches[1];
96
97	$cursor += strlen($url) + strlen($pre_hit);
98	$buffer .= $pre_hit;
99
100	$url = html_entity_decode($url);
101
102
103	//
104	// remove trailing punctuation from url
105	//
106
107	while (preg_match('\|[.,!;:?]$\|', $url)) {
108	$url = substr($url, 0, strlen($url) - 1);
109	$cursor--;
110	}
111	foreach (array('()', '[]', '{}') as $pair) {
112	$o = substr($pair, 0, 1);
113	$c = substr($pair, 1, 1);
114	if (preg_match("!^(\\$c\|^)[^\\$o]+\\$c$!", $url)) {
115	$url = substr($url, 0, strlen($url) - 1);
116	$cursor--;
117	}
118	}
119
120
121	//
122	// nice-i-fy url here
123	//
124
125	$link_url = $url;
126	$display_url = $url;
127
128	if ($force_prefix) {
129	$link_url = $force_prefix . $link_url;
130	}
131
132	if ($autolink_options['strip_protocols']) {
133	if (preg_match('!^(http\|https)://!i', $display_url, $m)) {
134	$display_url = substr($display_url, strlen($m[1]) + 3);
135	}
136	}
137
138	$display_url = self::cff_autolink_label($display_url, $limit);
139
140
141	//
142	// add the url
143	//
144
145	if ($display_url != $link_url && !preg_match('@title=@msi', $tagfill) && $auto_title) {
146	$display_quoted = preg_quote($display_url, '!');
147
148	if (!preg_match("!^(http\|https)://{$display_quoted}$!i", $link_url)) {
149	$tagfill .= ' title="' . $link_url . '"';
150	}
151	}
152
153	$link_url_enc = HtmlSpecialChars($link_url);
154	$display_url_enc = HtmlSpecialChars($display_url);
155
156
157	if (substr($link_url_enc, 0, 4) !== "http") {
158	$link_url_enc = 'https://' . $link_url_enc;
159	}
160	$buffer .= "<a href=\"{$link_url_enc}\" rel='nofollow noopener noreferrer'>{$display_url_enc}</a>";
161	} else {
162	// echo "fail 3 at $cursor<br />\n";
163
164	$ok = 0;
165	$cursor += $fail_len;
166	$buffer .= $fail_text;
167	}
168	}
169	}
170
171	//
172	// add everything from the cursor to the end onto the buffer.
173	//
174
175	$buffer .= substr($text, $cursor);
176
177	return $buffer;
178	}
179
180
181	public static function cff_autolink_label($text, $limit)
182	{
183	if (!$limit) {
184	return $text;
185	}
186
187	if (strlen($text) > $limit) {
188	return substr($text, 0, $limit - 3) . '...';
189	}
190
191	return $text;
192	}
193
194
195	public static function cff_autolink_email($text = '', $tagfill = '')
196	{
197	$atom = '[^()<>@,;:\\\\".\\[\\]\\x00-\\x20\\x7f]+'; // from RFC822
198
199	// die($atom);
200
201	$text_l = StrToLower($text);
202	$cursor = 0;
203	$loop = 1;
204	$buffer = '';
205
206	while (($cursor < strlen($text)) && $loop) {
207	//
208	// find an '@' symbol
209	//
210
211	$ok = 1;
212	$pos = strpos($text_l, '@', $cursor);
213
214	if ($pos === false) {
215	$loop = 0;
216	$ok = 0;
217	} else {
218	$pre = substr($text, $cursor, $pos - $cursor);
219	$hit = substr($text, $pos, 1);
220	$post = substr($text, $pos + 1);
221
222	$fail_text = $pre . $hit;
223	$fail_len = strlen($fail_text);
224
225	// die("$pre::$hit::$post::$fail_text");
226
227	//
228	// substring found - first check to see if we're inside a link tag already...
229	//
230
231	$bits = preg_split("!</a>!i", $pre);
232	$last_bit = array_pop($bits);
233	if (preg_match("!<a\s!i", $last_bit)) {
234	// echo "fail 1 at $cursor<br />\n";
235
236	$ok = 0;
237	$cursor += $fail_len;
238	$buffer .= $fail_text;
239	}
240	}
241
242	//
243	// check backwards
244	//
245
246	if ($ok) {
247	if (preg_match("!($atom(\.$atom)*)\$!", $pre, $matches)) {
248	// move matched part of address into $hit
249
250	$len = strlen($matches[1]);
251	$plen = strlen($pre);
252
253	$hit = substr($pre, $plen - $len) . $hit;
254	$pre = substr($pre, 0, $plen - $len);
255	} else {
256	// echo "fail 2 at $cursor ($pre)<br />\n";
257
258	$ok = 0;
259	$cursor += $fail_len;
260	$buffer .= $fail_text;
261	}
262	}
263
264	//
265	// check forwards
266	//
267
268	if ($ok) {
269	if (preg_match("!^($atom(\.$atom)*)!", $post, $matches)) {
270	// move matched part of address into $hit
271
272	$len = strlen($matches[1]);
273
274	$hit .= substr($post, 0, $len);
275	$post = substr($post, $len);
276	} else {
277	// echo "fail 3 at $cursor ($post)<br />\n";
278
279	$ok = 0;
280	$cursor += $fail_len;
281	$buffer .= $fail_text;
282	}
283	}
284
285	//
286	// commit
287	//
288
289	if ($ok) {
290	$cursor += strlen($pre) + strlen($hit);
291	$buffer .= $pre;
292	$buffer .= "<a href=\"mailto:$hit\"$tagfill>$hit</a>";
293	}
294	}
295
296	//
297	// add everything from the cursor to the end onto the buffer.
298	//
299
300	$buffer .= substr($text, $cursor);
301
302	return $buffer;
303	}
304	}
305