add function minifier and file cache auto minifier

README.md

@@ -39,7 +39,7 @@ Features
 - Responsive Design
 - User Roles
 - Online Backup
-- File Caching
+- File Caching (Auto Minify HTML support)
 - Online Update
 - Post Draft
 - i18n

system/includes/dispatch.php

@@ -136,6 +136,134 @@ if (extension_loaded('mcrypt')) {
 
 }
 
+// Based on <https://github.com/mecha-cms/extend.minify>
+// HTML Minifier
+function minify_html($input) {
+    if(trim($input) === "") return $input;
+    // Remove extra white-space(s) between HTML attribute(s)
+    $input = preg_replace_callback('#<([^\/\s<>!]+)(?:\s+([^<>]*?)\s*|\s*)(\/?)>#s', function($matches) {
+        return '<' . $matches[1] . preg_replace('#([^\s=]+)(\=([\'"]?)(.*?)\3)?(\s+|$)#s', ' $1$2', $matches[2]) . $matches[3] . '>';
+    }, str_replace("\r", "", $input));
+    // Minify inline CSS declaration(s)
+    if(strpos($input, ' style=') !== false) {
+        $input = preg_replace_callback('#<([^<]+?)\s+style=([\'"])(.*?)\2(?=[\/\s>])#s', function($matches) {
+            return '<' . $matches[1] . ' style=' . $matches[2] . minify_css($matches[3]) . $matches[2];
+        }, $input);
+    }
+    if(strpos($input, '</style>') !== false) {
+      $input = preg_replace_callback('#<style(.*?)>(.*?)</style>#is', function($matches) {
+        return '<style' . $matches[1] .'>'. minify_css($matches[2]) . '</style>';
+      }, $input);
+    }
+    if(strpos($input, '</script>') !== false) {
+      $input = preg_replace_callback('#<script(.*?)>(.*?)</script>#is', function($matches) {
+        return '<script' . $matches[1] .'>'. minify_js($matches[2]) . '</script>';
+      }, $input);
+    }
+
+    return preg_replace(
+        array(
+            // t = text
+            // o = tag open
+            // c = tag close
+            // Keep important white-space(s) after self-closing HTML tag(s)
+            '#<(img|input)(>| .*?>)#s',
+            // Remove a line break and two or more white-space(s) between tag(s)
+            '#(<!--.*?-->)|(>)(?:\n*|\s{2,})(<)|^\s*|\s*$#s',
+            '#(<!--.*?-->)|(?<!\>)\s+(<\/.*?>)|(<[^\/]*?>)\s+(?!\<)#s', // t+c || o+t
+            '#(<!--.*?-->)|(<[^\/]*?>)\s+(<[^\/]*?>)|(<\/.*?>)\s+(<\/.*?>)#s', // o+o || c+c
+            '#(<!--.*?-->)|(<\/.*?>)\s+(\s)(?!\<)|(?<!\>)\s+(\s)(<[^\/]*?\/?>)|(<[^\/]*?\/?>)\s+(\s)(?!\<)#s', // c+t || t+o || o+t -- separated by long white-space(s)
+            '#(<!--.*?-->)|(<[^\/]*?>)\s+(<\/.*?>)#s', // empty tag
+            '#<(img|input)(>| .*?>)<\/\1>#s', // reset previous fix
+            '#(&nbsp;)&nbsp;(?![<\s])#', // clean up ...
+            '#(?<=\>)(&nbsp;)(?=\<)#', // --ibid
+            // Remove HTML comment(s) except IE comment(s)
+            '#\s*<!--(?!\[if\s).*?-->\s*|(?<!\>)\n+(?=\<[^!])#s'
+        ),
+        array(
+            '<$1$2</$1>',
+            '$1$2$3',
+            '$1$2$3',
+            '$1$2$3$4$5',
+            '$1$2$3$4$5$6$7',
+            '$1$2$3',
+            '<$1$2',
+            '$1 ',
+            '$1',
+            ""
+        ),
+    $input);
+}
+
+// CSS Minifier => http://ideone.com/Q5USEF + improvement(s)
+function minify_css($input) {
+    if(trim($input) === "") return $input;
+    return preg_replace(
+        array(
+            // Remove comment(s)
+            '#("(?:[^"\\\]++|\\\.)*+"|\'(?:[^\'\\\\]++|\\\.)*+\')|\/\*(?!\!)(?>.*?\*\/)|^\s*|\s*$#s',
+            // Remove unused white-space(s)
+            '#("(?:[^"\\\]++|\\\.)*+"|\'(?:[^\'\\\\]++|\\\.)*+\'|\/\*(?>.*?\*\/))|\s*+;\s*+(})\s*+|\s*+([*$~^|]?+=|[{};,>~]|\s(?![0-9\.])|!important\b)\s*+|([[(:])\s++|\s++([])])|\s++(:)\s*+(?!(?>[^{}"\']++|"(?:[^"\\\]++|\\\.)*+"|\'(?:[^\'\\\\]++|\\\.)*+\')*+{)|^\s++|\s++\z|(\s)\s+#si',
+            // Replace `0(cm|em|ex|in|mm|pc|pt|px|vh|vw|%)` with `0`
+            '#(?<=[\s:])(0)(cm|em|ex|in|mm|pc|pt|px|vh|vw|%)#si',
+            // Replace `:0 0 0 0` with `:0`
+            '#:(0\s+0|0\s+0\s+0\s+0)(?=[;\}]|\!important)#i',
+            // Replace `background-position:0` with `background-position:0 0`
+            '#(background-position):0(?=[;\}])#si',
+            // Replace `0.6` with `.6`, but only when preceded by `:`, `,`, `-` or a white-space
+            '#(?<=[\s:,\-])0+\.(\d+)#s',
+            // Minify string value
+            '#(\/\*(?>.*?\*\/))|(?<!content\:)([\'"])([a-z_][a-z0-9\-_]*?)\2(?=[\s\{\}\];,])#si',
+            '#(\/\*(?>.*?\*\/))|(\burl\()([\'"])([^\s]+?)\3(\))#si',
+            // Minify HEX color code
+            '#(?<=[\s:,\-]\#)([a-f0-6]+)\1([a-f0-6]+)\2([a-f0-6]+)\3#i',
+            // Replace `(border|outline):none` with `(border|outline):0`
+            '#(?<=[\{;])(border|outline):none(?=[;\}\!])#',
+            // Remove empty selector(s)
+            '#(\/\*(?>.*?\*\/))|(^|[\{\}])(?:[^\s\{\}]+)\{\}#s'
+        ),
+        array(
+            '$1',
+            '$1$2$3$4$5$6$7',
+            '$1',
+            ':0',
+            '$1:0 0',
+            '.$1',
+            '$1$3',
+            '$1$2$4$5',
+            '$1$2$3',
+            '$1:0',
+            '$1$2'
+        ),
+    $input);
+}
+
+// JavaScript Minifier
+function minify_js($input) {
+    if(trim($input) === "") return $input;
+    return preg_replace(
+        array(
+            // Remove comment(s)
+            '#\s*("(?:[^"\\\]++|\\\.)*+"|\'(?:[^\'\\\\]++|\\\.)*+\')\s*|\s*\/\*(?!\!|@cc_on)(?>[\s\S]*?\*\/)\s*|\s*(?<![\:\=])\/\/.*(?=[\n\r]|$)|^\s*|\s*$#',
+            // Remove white-space(s) outside the string and regex
+            '#("(?:[^"\\\]++|\\\.)*+"|\'(?:[^\'\\\\]++|\\\.)*+\'|\/\*(?>.*?\*\/)|\/(?!\/)[^\n\r]*?\/(?=[\s.,;]|[gimuy]|$))|\s*([!%&*\(\)\-=+\[\]\{\}|;:,.<>?\/])\s*#s',
+            // Remove the last semicolon
+            '#;+\}#',
+            // Minify object attribute(s) except JSON attribute(s). From `{'foo':'bar'}` to `{foo:'bar'}`
+            '#([\{,])([\'])(\d+|[a-z_][a-z0-9_]*)\2(?=\:)#i',
+            // --ibid. From `foo['bar']` to `foo.bar`
+            '#([a-z0-9_\)\]])\[([\'"])([a-z_][a-z0-9_]*)\2\]#i'
+        ),
+        array(
+            '$1',
+            '$1$2',
+            '}',
+            '$1$3',
+            '$1.$3'
+        ),
+    $input);
+}
+
 function set_cookie($name, $value, $expire = 31536000, $path = '/')
 {
     $value = (function_exists('encrypt') ? encrypt($value) : $value);
@@ -361,10 +489,11 @@ function render($view, $locals = null, $layout = null)
         }
         if (!$login && $view != '404') {
             if (!file_exists($cachefile)) {
+                $content = minify_html(ob_get_contents()); // Minify HTML
                 if (config('cache.timestamp') == 'true') {
-                    echo "\n" . '<!-- Cached page generated on '.date('Y-m-d H:i:s').' -->';
+                    $content .= "\n" . '<!-- Cached page generated on '.date('Y-m-d H:i:s').' -->';
                 }
-                file_put_contents($cachefile, ob_get_contents());
+                file_put_contents($cachefile, $content);
             }
         }
         echo trim(ob_get_clean());