MAPG-180 ability to inline CSS and JS assets

src/View/Linker.php

@@ -2,6 +2,8 @@
 
 class Linker
 {
+    const INLINE_ASSET_LIMIT = 2000;
+
     private string $view;
 
     public function __construct(string $view)
@@ -14,9 +16,7 @@ class Linker
         $input = ROOT . '/views/' . $this->view . '.php';
 
         $temporaryFiles = [];
-        $css = [];
-        $js = [];
-        $sections = [];
+        $sections = ['externalCss' => '', 'inlineCss' => '', 'externalJs' => '', 'inlineJs' => ''];
         $extra = ['', ''];
 
         do {
@@ -25,14 +25,14 @@ class Linker
 
             $extends = $fragment->getExtends();
 
-            $css = array_merge($css, $fragment->getCss());
-            $js = array_merge($js, $fragment->getJs());
+            $this->generateAssets($fragment, $sections);
+
             $sections = array_merge($sections, $fragment->getSections()); //TODO: detect if section defined multiple times
             $extra[0] = $fragment->getExtra()[0] . $extra[0];
             $extra[1] = $extra[1] . $fragment->getExtra()[1];
 
             if ($extends === null) {
-                $this->writeFinal($css, $js, $extra, $input, ROOT . '/cache/views/' . $this->view . '.php');
+                $this->writeFinal($extra, $input, ROOT . '/cache/views/' . $this->view . '.php');
                 break;
             }
 
@@ -78,7 +78,7 @@ class Linker
         fclose($outputFileHandle);
     }
 
-    private function writeFinal(array $css, array $js, array $extra, string $file, string $output): void
+    private function writeFinal(array $extra, string $file, string $output): void
     {
         $dirname = pathinfo($output, PATHINFO_DIRNAME);
         if (!is_dir($dirname)) {
@@ -95,22 +95,6 @@ class Linker
             throw new \Exception('Cannot open file ' . $output . 'for writing.');
         }
 
-        if (count($css) > 0) {
-            fwrite($outputFileHandle, '<?php' . PHP_EOL . '$cssFiles = [];' . PHP_EOL);
-            foreach ($css as $cssFile) {
-                fwrite($outputFileHandle, '$cssFiles[] = ' . $cssFile . ';' . PHP_EOL);
-            }
-            fwrite($outputFileHandle, '?>' . PHP_EOL);
-        }
-
-        if (count($js) > 0) {
-            fwrite($outputFileHandle, '<?php' . PHP_EOL . '$jsFiles = [];' . PHP_EOL);
-            foreach ($js as $jsFile) {
-                fwrite($outputFileHandle, '$jsFiles[] = ' . $jsFile . ';' . PHP_EOL);
-            }
-            fwrite($outputFileHandle, '?>' . PHP_EOL);
-        }
-
         fwrite($outputFileHandle, $extra[0]);
         while (($line = fgets($inputFileHandle)) !== false) {
             fwrite($outputFileHandle, $line);
@@ -120,4 +104,52 @@ class Linker
         fclose($inputFileHandle);
         fclose($outputFileHandle);
     }
+
+    private function generateAssets(ParsedFragment $fragment, array &$sections)
+    {
+        foreach ($fragment->getCss() as $cssFile) {
+            $asset = $this->parseAsset($cssFile, 'css');
+            if (isset($asset['code'])) {
+                $sections['inlineCss'] .= '<style>' . PHP_EOL;
+                $sections['inlineCss'] .= $asset['code'];
+                $sections['inlineCss'] .= '</style>' . PHP_EOL;
+            } elseif (isset($asset['file'])) {
+                $sections['externalCss'] .= '<link href="' . $asset['file'] . '" rel="stylesheet">' . PHP_EOL;
+            }
+        }
+
+        foreach ($fragment->getJs() as $jsFile) {
+            $asset = $this->parseAsset($jsFile, 'js');
+            if (isset($asset['code'])) {
+                $sections['inlineJs'] .= '<script>' . PHP_EOL;
+                $sections['inlineJs'] .= $asset['code'];
+                $sections['inlineJs'] .= '</script>' . PHP_EOL;
+            } elseif (isset($asset['file'])) {
+                $sections['externalJs'] .= '<script src="' . $asset['file'] . '"></script>' . PHP_EOL;
+            }
+        }
+    }
+
+    private function parseAsset(string $asset, string $type): array
+    {
+        $output = [];
+
+        eval('$asset = ' . $asset . ';');
+
+        if (
+            empty($_ENV['DEV']) &&
+            preg_match('/^' . $type . '\/.*/', $asset) &&
+            filesize(ROOT . '/public/static/' . $asset) < self::INLINE_ASSET_LIMIT
+        ) {
+            $output['code'] = file_get_contents(ROOT . '/public/static/' . $asset);
+        } else {
+            if (!preg_match('/^http(s)?/', $asset)) {
+                $output['file'] = $_ENV['STATIC_ROOT'] .  '/' . $asset . '?rev=' . REVISION;
+            } else {
+                $output['file'] = $asset;
+            }
+        }
+
+        return $output;
+    }
 }