<?php

class mtgMetaEnum extends mtgUserType
{
  private $values = array();

  function validate(mtgMetaInfo $meta) {}

  function addValue($value_name, $value)
  {
    if(isset($this->values[$value_name]))
      throw new Exception("Enum '{$this->name}' already has value with name '{$value_name}'");

    if(in_array($value, $this->values))
      throw new Exception("Enum '{$this->name}' already has value '{$value}'");

    $this->values[$value_name] = $value; 
  }

  function calcOrValue($or_keys)
  {
    $res = 0;
    foreach($or_keys as $value_name)
    {
      if(!isset($this->values[$value_name]))
        throw new Exception("Enum '{$this->name}' has no value '{$value_name}'");
      $res |= $this->values[$value_name];
    }

    return $res;
  }

  function addOrValues($values)
  {
    foreach($values as $value_name => $or_keys)
      $this->addValue($value_name, $this->calcOrValue($or_keys));
  }

  function getValues()
  {
    return $this->values;
  }

  function override(mtgMetaEnum $other)
  {
    $this->tokens = array_merge($this->tokens, $other->getTokens());
    $this->values = array_merge($this->values, $other->getValues());
  }

  function replace(mtgMetaEnum $other)
  {
    $this->tokens = $other->getTokens();
    $this->values = $other->getValues();
  }
}