/*

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 */

/*
 * ast_enum.cc - Implementation of class AST_Enum
 *
 * AST_Enum nodes denote IDL enum declarations.
 * AST_Enums are a subclass of AST_ConcreteType and UTL_Scope.
 * They have a counter denoting the next value to be assigned to
 * an enumerator, and a name (a UTL_ScopedName).
 */

#include	<idl.hh>
#include	<idl_extern.hh>

/*
 * Constructor(s) and destructor
 */
AST_Enum::AST_Enum()
	: pd_enum_counter(0)
{
}

AST_Enum::AST_Enum(UTL_ScopedName *n, UTL_StrList *p)
       : AST_Decl(AST_Decl::NT_enum, n, p),
	 UTL_Scope(AST_Decl::NT_enum),
	 pd_enum_counter(0)
{
}

/*
 * Private operations
 */

/*
 * Public operations
 */

/*
 * Look up an enumerator by the value of the supplied expression
 */
AST_EnumVal *
AST_Enum::lookup_by_value(const AST_Expression *v)
{
  UTL_ScopeActiveIterator *iter;
  AST_EnumVal		    *item;
  AST_Decl		  *i;

  iter = new UTL_ScopeActiveIterator(this, IK_decls);

  while (!iter->is_done()) {
    i = iter->item();
    item = AST_EnumVal::narrow_from_decl(i);
    if ((*(item->constant_value())) == ((AST_Expression *)v)) {
      delete iter;
      return item;
    }
    iter->next();
  }
  delete iter;
  return NULL;
}

/*
 * Compute the value to be assigned to the next enumerator. Bump the
 * counter
 */
unsigned long
AST_Enum::next_enum_val()
{
  unsigned long i = pd_enum_counter++;

  return i;
}

/*
 * Static helper functions
 */

/*
 * Modify scoped name of an enumval so that it is scoped inside the scope
 * in which the enum is defined and not inside the enum itself
 */
static UTL_ScopedName *
munge_name_for_enumval(UTL_ScopedName *n, Identifier *last_component)
{
  long		  l	= n->length();
  UTL_ScopedName *hold	= n;

  /*
   * last three components are:
   * - scope in which enum is defined
   * - scope for enum
   * - name of enumval
   *
   * We want to stop cdr'ing down the list when the head of the
   * list is at the name for the scope in which the enum is defined
   */
  while (l > 3) {
    l--;
    n = (UTL_ScopedName *) n->tail();
  }

  n->set_tail(new UTL_IdList(last_component, NULL));

  return hold;
}
  
/*
 * Redefinition of inherited virtual operations
 */

/*
 * Add an AST_EnumVal node to this scope
 */
AST_EnumVal *AST_Enum::fe_add_enum_val(AST_EnumVal *t)
{
  AST_Decl *d;
  AST_EnumVal *t1 = NULL;

  if (t != NULL) {
    t1 = idl_global->gen()->create_enum_val
      (t->constant_value()->coerce(AST_Expression::EV_ulong)->u.ulval, 
       t->name(), t->pragmas());
    t->set_name(munge_name_for_enumval(t->name(), t->local_name()));
    t1->set_name(munge_name_for_enumval(t1->name(), t1->local_name()));
  }
  /*
   * Already defined and cannot be redefined? Or already used?
   */
  if ((d = lookup_for_add(t, I_FALSE,I_TRUE)) != NULL) {
    if (!can_be_redefined(d)) {
      idl_global->err()->error3(UTL_Error::EIDL_REDEF, t, this, d);
      return NULL;
    }
    if (referenced(d)) {
      idl_global->err()->error3(UTL_Error::EIDL_DEF_USE, t, this, d);
      return NULL;
    }
    if (t->has_ancestor(d)) {
      idl_global->err()->redefinition_in_scope(t, d);
      return NULL;
    }
  }
  /*
   * Add it to scope
   */
  add_to_scope(t);
  /*
   * Add it to set of locally referenced symbols
   */
  add_to_referenced(t, I_FALSE);
  /*
   * Add it to enclosing scope
   */
  idl_global->scopes()->next_to_top()->fe_add_enum_val(t1);

  return t;
}

/*
 * Dump this AST_Enum to the ostream o
 */
void
AST_Enum::dump( std:: ostream &o)
{
  UTL_ScopeActiveIterator *i = new UTL_ScopeActiveIterator(this, IK_decls);
  AST_Decl		    *d;

  o << "enum ";
  local_name()->dump(o);
  o << " {\n";

  while (!(i->is_done())) {
    d = i->item();
    d->local_name()->dump(o);
    i->next();
    if (!(i->is_done()))
      o << ", ";
  }
  delete i;

  idl_global->indent()->skip_to(o);
  o << "}";
}

/*
 * Narrowing methods
 */
IMPL_NARROW_METHODS2(AST_Enum, AST_ConcreteType, UTL_Scope)
IMPL_NARROW_FROM_DECL(AST_Enum)
IMPL_NARROW_FROM_SCOPE(AST_Enum)
