// This code sums the values of all assets and all liabilities.

SymbolTable {
  traversal allAttribs (GetAttributeVisitor) {
    to {Symbol,Asset,Liability};
  }
}

GetAttributeVisitor  {
  {{
     double assets;
     double liabilities;
     boolean isAsset;
     boolean isLiability;
  }}

  public double getAssets() {{
    return assets;
  }}

  public double getLiabilities() {{
    return liabilities;
  }}

  before SymbolTable {{
    assets = 0;
    liabilities = 0;
  }}

  before Symbol {{
    isAsset = false;
    isLiability = false;
  }}

  before Asset {{
    isAsset = true;
  }}

  before Liability {{
    isLiability = true;
  }}

  after Symbol {{
    if (isAsset) {
      assets += host.getValue();
    } else if (isLiability) {
      liabilities += host.getValue();
    }
  }}
}