/*
 * attribute set management
 */

#include "config.h"

#include "lsys.h"
#include "attr.h"

vec attribute_set::operator ()(const string &attr, const vec &def) const t_err
{
  const_iterator i;
  if ((i = find (attr)) == end ())
    return def;
  
  if (i->second.size () != 3)
    throw error("attribute '" + attr + "' must have three elements", i->second);
  
  return vec (eval_expr (i->second.first  ()),
              eval_expr (i->second.second ()),
              eval_expr (i->second.third  ()));
}