extracted name configuration

Author: transistive

src/Parameter.php

@@ -86,11 +86,7 @@ class Parameter implements
      */
     public function __construct(?string $parameter = null)
     {
-        $parameter ??= $this->generateName('param');
-
-        self::assertValidName($parameter);
-
-        $this->name = $parameter;
+        $this->configureName($parameter, 'param');
     }
 
     /**

src/Traits/HasNameTrait.php

@@ -11,6 +11,11 @@ trait HasNameTrait
 {
     private string $name;
 
+    /**
+     * Returns the length in bytes of the auto-generated part of a name.
+     *
+     * @return int
+     */
     public static function automaticVariableLength(): int
     {
         return 32;
@@ -44,4 +49,13 @@ private function generateName(string $prefix = 'var', int $length = null): strin
 
         return $prefix . substr(bin2hex(openssl_random_pseudo_bytes(ceil($length / 2))), 0, $length);
     }
+
+    private function configureName(?string $givenName, string $prefix, int $length = null): void
+    {
+        $name = $givenName ?? $this->generateName($prefix, $length);
+
+        self::assertValidName($name);
+
+        $this->name = $name;
+    }
 }

src/Variable.php

@@ -94,11 +94,7 @@ class Variable implements
      */
     public function __construct(?string $variable = null)
     {
-        $variable ??= $this->generateName('var');
-
-        self::assertValidName($variable);
-
-        $this->name = $variable;
+        $this->configureName($variable, 'var');
     }
 
     /**