// This code is licensed under the MIT license
//
//###################################################################
//
// These are global options. You can set them before calling the autolinking
// functions to change the output.
//
$GLOBALS['autolink_options'] = [
// Should http:// be visibly stripped from the front
// of URLs?
'strip_protocols' => false,
];
//###################################################################
function autolink($text, $limit = 30, $tagfill = '', $auto_title = true)
{
$text = autolink_do($text, '![a-z][a-z-]+://!i', $limit, $tagfill, $auto_title);
$text = autolink_do($text, '!(mailto|skype):!i', $limit, $tagfill, $auto_title);
$text = autolink_do($text, '!www\\.!i', $limit, $tagfill, $auto_title, 'http://');
return $text;
}
//###################################################################
function autolink_do($text, $sub, $limit, $tagfill, $auto_title, $force_prefix = null)
{
$text_l = strtolower($text);
$cursor = 0;
$loop = 1;
$buffer = '';
while (($cursor < strlen($text)) && $loop) {
$ok = 1;
$matched = preg_match($sub, $text_l, $m, PREG_OFFSET_CAPTURE, $cursor);
if (! $matched) {
$loop = 0;
$ok = 0;
} else {
$pos = $m[0][1];
$sub_len = strlen($m[0][0]);
$pre_hit = substr($text, $cursor, $pos - $cursor);
$hit = substr($text, $pos, $sub_len);
$pre = substr($text, 0, $pos);
$post = substr($text, $pos + $sub_len);
$fail_text = $pre_hit.$hit;
$fail_len = strlen($fail_text);
//
// substring found - first check to see if we're inside a link tag already...
//
$bits = preg_split('!!i', $pre);
$last_bit = array_pop($bits);
if (preg_match("!\n";
$ok = 0;
$cursor += $fail_len;
$buffer .= $fail_text;
}
}
//
// looks like a nice spot to autolink from - check the pre
// to see if there was whitespace before this match
//
if ($ok) {
if ($pre) {
if (! preg_match('![\s\(\[\{>]$!s', $pre)) {
//echo "fail 2 at $cursor ($pre)
\n";
$ok = 0;
$cursor += $fail_len;
$buffer .= $fail_text;
}
}
}
//
// we want to autolink here - find the extent of the url
//
if ($ok) {
if (preg_match('/^([a-z0-9\-\.\/\-_%~!?=,:;&+*#@\(\)\$]+)/i', $post, $matches)) {
$url = $hit.$matches[1];
$cursor += strlen($url) + strlen($pre_hit);
$buffer .= $pre_hit;
$url = html_entity_decode($url);
//
// remove trailing punctuation from url
//
while (preg_match('|[.,!;:?]$|', $url)) {
$url = substr($url, 0, strlen($url) - 1);
$cursor--;
}
foreach (['()', '[]', '{}'] as $pair) {
$o = substr($pair, 0, 1);
$c = substr($pair, 1, 1);
if (preg_match("!^(\\$c|^)[^\\$o]+\\$c$!", $url)) {
$url = substr($url, 0, strlen($url) - 1);
$cursor--;
}
}
//
// nice-i-fy url here
//
$link_url = $url;
$display_url = $url;
if ($force_prefix) {
$link_url = $force_prefix.$link_url;
}
if ($GLOBALS['autolink_options']['strip_protocols']) {
if (preg_match('!^(http|https)://!i', $display_url, $m)) {
$display_url = substr($display_url, strlen($m[1]) + 3);
}
}
$display_url = autolink_label($display_url, $limit);
//
// add the url
//
$currentTagfill = $tagfill;
if ($display_url != $link_url && ! preg_match('@title=@msi', $currentTagfill) && $auto_title) {
$display_quoted = preg_quote($display_url, '!');
if (! preg_match("!^(http|https)://{$display_quoted}$!i", $link_url)) {
$currentTagfill .= ' title="'.$link_url.'"';
}
}
$link_url_enc = htmlspecialchars($link_url);
$display_url_enc = htmlspecialchars($display_url);
$buffer .= "{$display_url_enc}";
} else {
//echo "fail 3 at $cursor
\n";
$ok = 0;
$cursor += $fail_len;
$buffer .= $fail_text;
}
}
}
//
// add everything from the cursor to the end onto the buffer.
//
$buffer .= substr($text, $cursor);
return $buffer;
}
//###################################################################
function autolink_label($text, $limit)
{
if (! $limit) {
return $text;
}
if (strlen($text) > $limit) {
return substr($text, 0, $limit - 3).'...';
}
return $text;
}
//###################################################################
function autolink_email($text, $tagfill = '')
{
$atom = '[^()<>@,;:\\\\".\\[\\]\\x00-\\x20\\x7f]+'; // from RFC822
//die($atom);
$text_l = strtolower($text);
$cursor = 0;
$loop = 1;
$buffer = '';
while (($cursor < strlen($text)) && $loop) {
//
// find an '@' symbol
//
$ok = 1;
$pos = strpos($text_l, '@', $cursor);
if ($pos === false) {
$loop = 0;
$ok = 0;
} else {
$pre = substr($text, $cursor, $pos - $cursor);
$hit = substr($text, $pos, 1);
$post = substr($text, $pos + 1);
$fail_text = $pre.$hit;
$fail_len = strlen($fail_text);
//die("$pre::$hit::$post::$fail_text");
//
// substring found - first check to see if we're inside a link tag already...
//
$bits = preg_split('!!i', $pre);
$last_bit = array_pop($bits);
if (preg_match("!\n";
$ok = 0;
$cursor += $fail_len;
$buffer .= $fail_text;
}
}
//
// check backwards
//
if ($ok) {
if (preg_match("!($atom(\.$atom)*)\$!", $pre, $matches)) {
// move matched part of address into $hit
$len = strlen($matches[1]);
$plen = strlen($pre);
$hit = substr($pre, $plen - $len).$hit;
$pre = substr($pre, 0, $plen - $len);
} else {
//echo "fail 2 at $cursor ($pre)
\n";
$ok = 0;
$cursor += $fail_len;
$buffer .= $fail_text;
}
}
//
// check forwards
//
if ($ok) {
if (preg_match("!^($atom(\.$atom)*)!", $post, $matches)) {
// move matched part of address into $hit
$len = strlen($matches[1]);
$hit .= substr($post, 0, $len);
$post = substr($post, $len);
} else {
//echo "fail 3 at $cursor ($post)
\n";
$ok = 0;
$cursor += $fail_len;
$buffer .= $fail_text;
}
}
//
// commit
//
if ($ok) {
$cursor += strlen($pre) + strlen($hit);
$buffer .= $pre;
$buffer .= "$hit";
}
}
//
// add everything from the cursor to the end onto the buffer.
//
$buffer .= substr($text, $cursor);
return $buffer;
}
//###################################################################;