CFF_Autolink.php
| 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 |