// This may look like C, but it's really -*- C++ -*-
// ast_interface.h,v 1.22 2002/09/25 16:25:39 parsons Exp
/*

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*/

#ifndef _AST_INTERFACE_AST_INTERFACE_HH
#define _AST_INTERFACE_AST_INTERFACE_HH

// NOTE: add (AST_EnumValue *) is defined here because enums can
// be defined manifest locally; the constants defined in these
// enums are inserted in the enclosing scope.

#include "ast_type.h"
#include "utl_scope.h"
#include "ace/Unbounded_Queue.h"

class TAO_IDL_FE_Export AST_Interface : public virtual AST_Type,
                                        public virtual UTL_Scope
{
public:
  AST_Interface (void);

  AST_Interface (UTL_ScopedName *n,
                 AST_Interface **ih,
                 long nih,
                 AST_Interface **ih_flat,
                 long nih_flat,
                 idl_bool local,
                 idl_bool abstract);

  virtual ~AST_Interface (void);

  // This serves for interfaces, value types, components, and eventtypes.
  static void fwd_redefinition_helper (AST_Interface *&i,
                                       UTL_Scope *s);

  // Overridden for valuetypes, components, and eventtypes.
  virtual void redefine (AST_Interface *from);

  AST_Interface **inherits (void) const;

  long n_inherits (void) const;

  AST_Interface **inherits_flat (void) const;

  long n_inherits_flat (void) const;

  void be_add_operation (AST_Operation *);

  void be_replace_operation (AST_Decl *old_op,
                             AST_Decl *new_op);

  // Is this interface defined? This predicate returns FALSE when an
  // interface was forward declared but not defined yet, and TRUE in
  // all other cases.
  idl_bool is_defined (void)
  {
    return (pd_n_inherits < 0) ? I_FALSE : I_TRUE;
  }

  // Check if we have redefined any of our parents' operations or attributes,
  // and check if there is such a clash among the parents
  virtual idl_bool redef_clash (void);

  // Cleanup function.
  virtual void destroy (void);

  // Narrowing.
  DEF_NARROW_METHODS2(AST_Interface, AST_Type, UTL_Scope);
  DEF_NARROW_FROM_DECL(AST_Interface);
  DEF_NARROW_FROM_SCOPE(AST_Interface);

  // AST Dumping.
  virtual void dump (ACE_OSTREAM_TYPE &o);

  // Visiting.
  virtual int ast_accept (ast_visitor *visitor);

protected:
  // Data.

  // Immediate ancestors.
  AST_Interface **pd_inherits;
  long pd_n_inherits;

  // All ancestors.
  AST_Interface **pd_inherits_flat;
  long pd_n_inherits_flat;

  // Queue data structure needed for breadth-first traversal of
  // inheritance tree.
  ACE_Unbounded_Queue<AST_Interface *> insert_queue;

  // For a special case of a deeply nested inheritance graph and one specific
  // way of inheritance in which a node that was already visited,
  // but is not present in
  // the queue, gets inserted at the tail. This situation arises when a node
  // multiply inherits from two or more interfaces in which the first parent is
  // higher up in the tree than the second parent. In addition, if the second
  // parent turns out to be a child of the first .

  // Queue of dequeued nodes to be searched for the above case.
  ACE_Unbounded_Queue<AST_Interface *> del_queue;

protected:
  // Scope Management Protocol.
  friend int tao_yyparse (void);

  virtual AST_Constant *fe_add_constant (AST_Constant *c);

  virtual AST_Exception *fe_add_exception (AST_Exception *e);

  virtual AST_Attribute *fe_add_attribute (AST_Attribute *a);

  virtual AST_Field *fe_add_field (AST_Field *o);

  virtual AST_Operation *fe_add_operation (AST_Operation *o);

  virtual AST_Union *fe_add_union (AST_Union *u);

  virtual AST_Structure *fe_add_structure (AST_Structure *s);

  virtual AST_UnionFwd *fe_add_union_fwd (AST_UnionFwd *u);

  virtual AST_StructureFwd *fe_add_structure_fwd (AST_StructureFwd *s);

  virtual AST_Enum *fe_add_enum (AST_Enum *e);

  virtual AST_EnumVal *fe_add_enum_val (AST_EnumVal *v);

  virtual AST_Typedef *fe_add_typedef (AST_Typedef *t);

  virtual AST_Native *fe_add_native (AST_Native *n);

  // Lookup based on the local name, override of UTL_Scope definition.
  // This version checks for redefinitions of attributes or operations.
  AST_Decl *lookup_for_add (AST_Decl *d,
                            idl_bool treat_as_ref);

  void redef_clash_populate_r (AST_Interface *t);
  // Populate the insert queue with our parents, and, if we are a
  // valuetype, with our supported interface and our parents'
  // supported interfaces.

  int insert_non_dup (AST_Interface *t);
  // Do non-duplicating insert of bi, by searching both the
  // insert queue and the delete queue.
};

#endif           // _AST_INTERFACE_AST_INTERFACE_HH
