//=====================================================================
//
//     ast.cpp: mini-C プログラムの抽象構文木 (実装)
//
//            コンパイラ実習  2004 (c) 平岡佑介, 石浦菜岐佐
//
//=====================================================================

#include "ast.h"

//---------------------------------------------------------------------
//   Type_string の実装
//---------------------------------------------------------------------
std::string Type_string(Type t)
{
  switch (t) {
    case Type_INT:  return "int";
    case Type_CHAR: return "char";
    default:        return "UNDEF";
  }
}

//---------------------------------------------------------------------
//   Opeartor_string の実装
//---------------------------------------------------------------------
std::string Operator_string(Operator o)
{
  switch (o) {
    case Operator_PLUS:  return "+";
    case Operator_MINUS: return "-";
    case Operator_MUL:   return "*";
    case Operator_DIV:   return "/";
    case Operator_MOD:   return "%";
    case Operator_LT:    return "<";
    case Operator_GT:    return ">";
    case Operator_LE:    return "<=";
    case Operator_GE:    return ">=";
    case Operator_NE:    return "!=";
    case Operator_EQ:    return "==";
    default:             return "???";
  }
}

static int tmp = 0; 

//---------------------------------------------------------------------
//  tab(int)
//    インデントを行うための関数 (ast.cpp の中だけで用いる)
//    indent で指定された段数の 2 倍のスペースを返す
//---------------------------------------------------------------------
static std::string tab(int indent)
{
  std::string tab_ = "";
  for(int i=0; i<indent; i++){
    tab_ += "  ";
  }
  return tab_;
}

//---------------------------------------------------------------------
//   Exp_constant::print の実装
//---------------------------------------------------------------------
void Exp_constant::print(std::ostream& os) const
{
  switch(type()) {
    case Type_INT: os << value(); break;
    case Type_CHAR: {
      os << '\'';
      if (value()=='\n') {
        os << '\\';
        os << 'n';
      }
      else if (value()=='\t') {
        os << '\\';
        os << 't';
      }
      else if (value()=='\\') {
        os << '\\';
        os << '\\';
      }
      else {
        os << (char) value();
      }
      os << '\'';
      break;
    }
    default: assert(0);
  }
}