Row adding, some webpack tweaks

app/Tables/ColumnNumerator.php

@@ -17,36 +17,23 @@ use MightyPork\Utils\Utils;
  * Thanks to this uniqueness, it could even be possible to compare or merge forks
  * of the same table.
  */
-class ColumnNumerator
+class ColumnNumerator extends BaseNumerator
 {
     const ALPHABET = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
                      'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'];
 
-    /** @var int */
-    private $next;
-    /** @var int */
-    private $last;
-
     /**
      * Create numerator for the given number of columns
+     *
+     * @param int $capacity - how many
      */
     public function __construct($capacity)
     {
-        list($this->next, $this->last) = Row::allocateColIDs($capacity);
+        parent::__construct(Row::allocateColIDs($capacity));
     }
 
-    /**
-     * Get next column name, incrementing the internal state
-     *
-     * @return string
-     */
-    public function next()
+    protected function getKey($index)
     {
-        if ($this->next > $this->last)
-            throw new \OutOfBoundsException("Column numerator has run out of allocated GCID slots");
-
-        $key = Utils::alphabetEncode($this->next, self::ALPHABET);
-        $this->next++;
-        return $key;
+        return Utils::alphabetEncode($index, self::ALPHABET);
     }
 }