From d94a66ca2b514370a36e5e9aae421d756e688105 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bruno=20Ryb=C3=A1rsky?= <bruno@brn.systems>
Date: Sun, 4 Feb 2024 10:45:44 +0100
Subject: [PATCH] test inlining

---
 lib/inliner.php | 77 ++++++++++++++++++++++++++++++-------------------
 1 file changed, 47 insertions(+), 30 deletions(-)

diff --git a/lib/inliner.php b/lib/inliner.php
index 700f64d..9bf353c 100644
--- a/lib/inliner.php
+++ b/lib/inliner.php
@@ -1,64 +1,81 @@
 <?php
 
 function inlineLocalStylesFromHref($inputString) {
-    // Define the regular expression pattern to match <link> tags with href attribute for CSS files
     $pattern = '/<link[^>]*?\srel=["\']?stylesheet["\'].*?\shref=["\']?\/(.*?)["\'][^>]*?>/i';
 
-    // Use preg_replace_callback to replace matched link tags with inline styles
     $outputString = preg_replace_callback($pattern, function($match) {
-        // Extract the href attribute value
         $href = $match[1];
-
         $cssFilePath = $_SERVER['DOCUMENT_ROOT'] . '/' . $href;
-
-        // Get the content of the local CSS file
         $cssContent = file_get_contents($cssFilePath);
-
-        // Get the directory where the CSS file is located
         $cssDir = dirname($cssFilePath);
 
-        // Replace relative paths in the CSS content to be relative to the CSS file's directory
         $cssContent = preg_replace_callback('/url\(["\']?(\/.*?|.*?)["\']?\)/i', function($urlMatch) use ($cssDir) {
-            // Extract the URL value
             $url = $urlMatch[1];
-
-            // Combine with the CSS file's directory to create an absolute path
             $absolutePath = $cssDir . '/' . $url;
-
-            // Make the path relative to the CSS file's directory
             $relativePath = ltrim(substr($absolutePath, strlen($_SERVER['DOCUMENT_ROOT'])), '/');
-
-            // Create the updated url() declaration
-            $updatedUrlDeclaration = 'url("' . $relativePath . '")';
-
-            return $updatedUrlDeclaration;
+            return 'url("' . $relativePath . '")';
         }, $cssContent);
 
-        // Create an inline style tag with the modified CSS content
-        return "<style>\n{$cssContent}\n</style>";
+        // Minify the CSS content
+        $cssContent = minifyCss($cssContent);
+
+        return "<style>{$cssContent}</style>";
     }, $inputString);
 
     return $outputString;
 }
 
 function inlineScriptFromSrc($inputString) {
-    // Define the regular expression pattern to match <script> tags with src attribute
     $pattern = '/<script.*?src=["\']\/(.*?)["\'].*?>\s*<\/script>/i';
 
-    // Use preg_replace_callback to replace matched script tags with inline script
     $outputString = preg_replace_callback($pattern, function($match) {
-        // Extract the src attribute value
         $src = $match[1];
-
-        // Get the content of the JavaScript file
         $jsContent = file_get_contents($_SERVER['DOCUMENT_ROOT'] . '/' . $src);
 
-        // Escape the JavaScript content for inline use
-        $escapedJsContent = htmlspecialchars($jsContent, ENT_QUOTES, 'UTF-8');
+        // Minify the JavaScript content
+        $jsContent = minifyJs($jsContent);
 
-        // Create an inline script with the escaped content
-        return "<script>\n{$escapedJsContent}\n</script>";
+        $escapedJsContent = htmlspecialchars($jsContent, ENT_QUOTES, 'UTF-8');
+        return "<script>{$escapedJsContent}</script>";
     }, $inputString);
 
     return $outputString;
+}
+
+function minifyCss($css) {
+    // Remove comments
+    $css = preg_replace('!/\*[^*]*\*+([^/][^*]*\*+)*/!', '', $css);
+
+    // Remove whitespace
+    $css = preg_replace('/\s+/', ' ', $css);
+
+    // Remove unnecessary semicolons
+    $css = str_replace(';}', '}', $css);
+
+    // Remove spaces around colons
+    $css = str_replace(': ', ':', $css);
+
+    // Remove spaces around commas
+    $css = str_replace(', ', ',', $css);
+
+    return trim($css);
+}
+
+function minifyJs($js) {
+    // Remove comments
+    $js = preg_replace('!/\*[^*]*\*+([^/][^*]*\*+)*/!', '', $js);
+
+    // Remove newlines and tabs
+    $js = str_replace(array("\r\n", "\r", "\n", "\t"), '', $js);
+
+    // Remove unnecessary semicolons
+    $js = str_replace(';}', '}', $js);
+
+    // Remove spaces after function keyword
+    $js = str_replace('function ', 'function', $js);
+
+    // Remove spaces around operators
+    $js = preg_replace('/\s*([=+\-*/])\s*/', '$1', $js);
+
+    return trim($js);
 }
\ No newline at end of file