// This code initializes the symbol table by traversing 
// declarations.

Main {
  traversal initSymbolTable (InitSymbolTableVisitor) {
    through Declaration
    bypassing Expr
    to *;
  }
}


InitSymbolTableVisitor {
  {{
  // the traversal builds a string for input to Symbol.parse()
  String str;
  String name;
  }}

  before Varname {{
    str = host.get_v().toString();
    name = str;
  }}

  before Asset {{
    str = str + " asset";
  }}

  before Liability {{
    str = str + " liability";
  }}

  after Declaration {{
    // first check if symbol is in table
    if (Main.symbolTable.findSymbol(name) != null) {
      System.out.println ("Warning: Ignoring redeclaration of variable " + name);
      return;
    }

    Expr expr = host.get_expr();
    if (expr != null) {
      str = str + " " + expr.evaluate();
    }

    Symbol symbol = Symbol.parse(str);
    Main.symbolTable.get_symbol_list().addElement(symbol);
  }}
}


// a shortcut for getting the Varname string
Varname {
  public String toString() {{
      return get_v().toString();
  }}
}