Optimize partial indentation and raw output

Author: theodorejb

src/Runtime.php

@@ -316,9 +316,15 @@ public static function escapeExpression(mixed $var): string
 
     /**
      * Get string representation for output
+     *
+     * This function has been optimized for JIT via a microbenchmark with common inputs.
      */
     public static function raw(mixed $value): string
     {
+        if (is_string($value)) {
+            return $value;
+        }
+
         if ($value === true) {
             return 'true';
         }
@@ -437,16 +443,11 @@ public static function invokePartial(RuntimeContext $cx, ?string $name, mixed $c
         }
 
         if ($indent !== '') {
-            $lines = explode("\n", $result);
-            $lastIdx = count($lines) - 1;
-            foreach ($lines as $i => &$line) {
-                if ($line === '' && $i === $lastIdx) {
-                    break;
-                }
-                $line = $indent . $line;
+            if (str_ends_with($result, "\n")) {
+                $result = $indent . str_replace("\n", "\n" . $indent, substr($result, 0, -1)) . "\n";
+            } elseif ($result !== '') {
+                $result = $indent . str_replace("\n", "\n" . $indent, $result);
             }
-            unset($line);
-            $result = implode("\n", $lines);
         }
 
         return $result;