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<?php
#
# A PHP auto-linking library
#
# https://github.com/iamcal/lib_autolink
#
# By Cal Henderson <cal@iamcal.com>
# 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.
#
$GLOBALS['autolink_options'] = array(
# Should http:// be visibly stripped from the front
# of URLs?
'strip_protocols' => true,
);
####################################################################
function autolink($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("!</a>!i", $pre);
$last_bit = array_pop($bits);
if (preg_match("!<a\s!i", $last_bit)){
#echo "fail 1 at $cursor<br />\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)<br />\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 (array('()', '[]', '{}') 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);
$buffer .= "<a href=\"{$link_url_enc}\"$currentTagfill>{$display_url_enc}</a>";
}else{
#echo "fail 3 at $cursor<br />\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("!</a>!i", $pre);
$last_bit = array_pop($bits);
if (preg_match("!<a\s!i", $last_bit)){
#echo "fail 1 at $cursor<br />\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)<br />\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)<br />\n";
$ok = 0;
$cursor += $fail_len;
$buffer .= $fail_text;
}
}
#
# commit
#
if ($ok) {
$cursor += strlen($pre) + strlen($hit);
$buffer .= $pre;
$buffer .= "<a href=\"mailto:$hit\"$tagfill>$hit</a>";
}
}
#
# add everything from the cursor to the end onto the buffer.
#
$buffer .= substr($text, $cursor);
return $buffer;
}
####################################################################
?>