Improve preprocessor directives

Author: SerafimArts

src/Directives/Directive/Directive.php

@@ -82,4 +82,18 @@ public function getMinArgumentsCount(): int
     {
         return $this->minArgumentsCount;
     }
+
+    /**
+     * @param mixed $result
+     * @return string
+     */
+    protected function toString(mixed $result): string
+    {
+        return match(true) {
+            $result === true => '1',
+            \is_null($result), $result === false => '0',
+            \is_string($result) => \var_export($result, true),
+            default => (string)$result,
+        };
+    }
 }

src/Directives/Directive/FunctionDirective.php

@@ -38,6 +38,6 @@ public function __construct(callable $cb)
      */
     public function __invoke(string ...$args): string
     {
-        return (string)($this->callback)(...$args);
+        return $this->toString(($this->callback)(...$args));
     }
 }

src/Directives/Directive/FunctionLikeDirective.php

@@ -64,6 +64,6 @@ public function __invoke(string ...$args): string
             $this->compiled = Compiler::compile($this->body, $this->args);
         }
 
-        return (string)($this->compiled)(...$args);
+        return $this->toString(($this->compiled)(...$args));
     }
 }