Replaced autolink function with 'iamcal/lib_autolink'.

https://github.com/iamcal/lib_autolink

Closes #5.

3 files changed, 337 insertions, 12 deletions

diff --git a/config-dist.php b/config-dist.php
index 41c6430..6ae5467 100644
--- a/config-dist.php
+++ b/config-dist.php
@@ -50,4 +50,5 @@ try {
 }
 
 // load functions
-require_once(ROOT.DS.'functions.php');
\ No newline at end of file
+require_once(ROOT.DS.'functions.php');
+require_once(ROOT.DS.'lib_autolink.php');
\ No newline at end of file
diff --git a/functions.php b/functions.php
index 19325d1..3dac79b 100644
--- a/functions.php
+++ b/functions.php
@@ -6,17 +6,6 @@ function path($fragment=null) {
 	return (!empty($config['path'][$fragment])) ? $config['path'][$fragment] : false;
 }
 
-function autolink($text='') {
-	// https://stackoverflow.com/a/10002262/3625228
-	$pattern = '(?xi)\b((?:https?://|www\d{0,3}[.]|[a-z0-9.\-]+[.][a-z]{2,4}/)(?:[^\s()<>]+|\(([^\s()<>]+|(\([^\s()<>]+\)))*\))+(?:\(([^\s()<>]+|(\([^\s()<>]+\)))*\)|[^\s`!()\[\]{};:\'".,<>?«»“”‘’]))';
-
-	return preg_replace_callback("#$pattern#i", function($matches) {
-		$input = $matches[0];
-		$url = preg_match('!^https?://!i', $input) ? $input : "http://$input";
-		return '<a href="' . $url . '" data-external="true">' . "$input</a>";
-	}, $text);
-}
-
 function db_insert($message, $timestamp=NOW) {
 	global $db;
 	if(empty($db)) return false;
diff --git a/lib_autolink.php b/lib_autolink.php
new file mode 100644
index 0000000..da39c03
--- /dev/null
+++ b/lib_autolink.php
@@ -0,0 +1,335 @@
+<?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\(\[\{>\pZ\p{Cc}]$!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;
+	}
+
+	####################################################################
+
+?>