/*
 
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Copyright 1992, 1993, 1994 Sun Microsystems, Inc.  Printed in the United
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This product is protected by copyright and distributed under the following
license restricting its use.
 
The Interface Definition Language Compiler Front End (CFE) is made
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notice on all media and documentation and the software program in which
this product is incorporated in whole or part. You may copy and extend
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ANY KIND INCLUDING THE WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS
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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.h>
#include <idl_extern.h>

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

AST_Enum::AST_Enum(UTL_ScopedName *n, const UTL_Pragmas &p)
      : AST_Decl(AST_Decl::NT_enum, n, p),
      UTL_Scope(AST_Decl::NT_enum, n, p),
      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() == 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->get_decl_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)) != 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(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)
