// This may look like C, but it's really -*- C++ -*-
// utl_scope.h,v 1.38 2004/10/29 15:17:47 parsons Exp
/*

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*/

#ifndef _UTL_SCOPE_UTL_SCOPE_HH
#define _UTL_SCOPE_UTL_SCOPE_HH

// This is the base class for name scoping. Each entity which can
// be directly contained in a naming scope has an add() function
// defined for it. The functions defined on the base scoping class
// all return FALSE. Each subclass of UTL_Scope should
// define its own add() functions for those types which are legal
// in that context. Then, for those types for which no local functions
// have been defined the function on the base class will be called to
// return FALSE.
//
// The "AST_" classes may redefine add() functions to implement any
// name binding mechanisms needed for their own functionality. It is
// the responsibility of those functions then to call the add()
// function defined in the parent "AST_" class.

#include "ast_decl.h"
#include "ast_expression.h"
#include "ast_typedef.h"
#include "utl_scoped_name.h"

// This is for AIX w/IBM C++.
class Identifier;

class AST_PredefinedType;
class AST_Module;
class AST_Interface;
class AST_InterfaceFwd;
class AST_ValueType;
class AST_ValueTypeFwd;
class AST_EventType;
class AST_EventTypeFwd;
class AST_Component;
class AST_ComponentFwd;
class AST_Home;
class AST_Constant;
class AST_Exception;
class AST_Attribute;
class AST_Operation;
class AST_Argument;
class AST_Union;
class AST_UnionFwd;
class AST_UnionBranch;
class AST_Structure;
class AST_StructureFwd;
class AST_Field;
class AST_Enum;
class AST_EnumVal;
class AST_Sequence;
class AST_String;
class AST_Array;
class AST_Native;
class AST_Factory;
class UTL_StrList;
class UTL_NameList;

// Forward declaration of active iterator for UTL_Scope.
class UTL_ScopeActiveIterator;

class TAO_IDL_FE_Export UTL_Scope : public virtual COMMON_Base
{
public:
  // Enum to denote the kind of iteration desired.
  enum ScopeIterationKind {
      IK_both           // Iterate through both decls and local types.
    , IK_decls          // Iterate only through decls.
    , IK_localtypes     // Iterate only through local types.
  };

  // Operations.

  // Constructor(s).
  UTL_Scope (void);
  UTL_Scope (AST_Decl::NodeType nt);

  // Destructor.
  virtual ~UTL_Scope (void);

  // Scope Management Protocol.
  virtual AST_PredefinedType *add_predefined_type (AST_PredefinedType *t);

  virtual AST_Module *add_module (AST_Module *m);

  virtual AST_Interface *add_interface (AST_Interface *i);

  virtual AST_InterfaceFwd *add_interface_fwd (AST_InterfaceFwd *i);

  virtual AST_ValueType *add_valuetype (AST_ValueType *i);

  virtual AST_ValueTypeFwd *add_valuetype_fwd (AST_ValueTypeFwd *i);

  virtual AST_EventType *add_eventtype (AST_EventType *i);

  virtual AST_EventTypeFwd *add_eventtype_fwd (AST_EventTypeFwd *i);

  virtual AST_Component *add_component (AST_Component *i);

  virtual AST_ComponentFwd *add_component_fwd (AST_ComponentFwd *i);

  virtual AST_Home *add_home (AST_Home *i);

  virtual AST_Constant *add_constant (AST_Constant *c);

  virtual AST_Exception *add_exception (AST_Exception *e);

  virtual AST_Attribute *add_attribute (AST_Attribute *a);

  virtual AST_Operation *add_operation (AST_Operation *o);

  virtual AST_Argument *add_argument (AST_Argument *a);

  virtual AST_Union *add_union (AST_Union *u);

  virtual AST_UnionFwd *add_union_fwd (AST_UnionFwd *u);

  virtual AST_UnionBranch *add_union_branch (AST_UnionBranch *b);

  virtual AST_Structure *add_structure (AST_Structure *s);

  virtual AST_StructureFwd *add_structure_fwd (AST_StructureFwd *s);

  virtual AST_Field *add_field (AST_Field *f);

  virtual AST_Enum *add_enum (AST_Enum *e);

  virtual AST_EnumVal *add_enum_val (AST_EnumVal *v);

  virtual AST_Typedef *add_typedef (AST_Typedef *t);

  virtual UTL_StrList *add_context (UTL_StrList *c);

  virtual UTL_NameList *add_exceptions (UTL_NameList *e);

  virtual AST_Sequence *add_sequence (AST_Sequence *s);

  virtual AST_String *add_string (AST_String *s);

  virtual AST_Array *add_array (AST_Array *a);

  virtual AST_Native *add_native (AST_Native *n);

  virtual AST_Factory *add_factory (AST_Factory *f);

  // Call back end add_XXX functions for this scope.
  virtual AST_Decl *call_add (void);

  // Data Accessors.
  AST_Decl::NodeType scope_node_type (void)
  {
    return pd_scope_node_type;
  }

  // Narrowing.
  DEF_NARROW_METHODS0(UTL_Scope);
  DEF_NARROW_FROM_SCOPE(UTL_Scope);

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

  // Other Operations.

  // Name Lookup Mechanism
  AST_Decl *lookup_by_name (UTL_ScopedName *,
                            idl_bool treat_as_ref,
                            idl_bool in_parent = 1);

  // Look up the Identifier * specified only in the local scope.
  AST_Decl *lookup_by_name_local (Identifier *,
                                  long index);

  // Look up a predefined type by its ExprType.
  AST_Decl *lookup_primitive_type (AST_Expression::ExprType);

  // Look up one of the pseudo-object types.
  AST_Decl *lookup_pseudo (Identifier *);

  virtual AST_Decl *look_in_previous (Identifier *);

  // How many entries are used?
  virtual unsigned long nmembers (void);

  // Add to decls. Node represents a local declaration
  // The new decl e is inserted after ex if ex is not 0.
  // This one is public because the case of a reopened
  // module necessitates a call to this from
  // be_generator::create_module().
  void add_to_scope (AST_Decl *e,
                     AST_Decl *ex = 0);

  // Add to name_referenced identifier list. It's public because
  // a union needs to add its enum discriminator label names.
  void add_to_name_referenced (Identifier *id);

  // Accessors for the has_prefix_ member.
  idl_bool has_prefix (void);
  void has_prefix (idl_bool val);

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

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

protected:
  // UTL_Scope protected addition protocol. This protocol is
  // used from sub-classes of UTL_Scope to insert nodes directly
  // into the specified node table (either decls or local_types)
  // Additionally, UTL_Scope also maintains a record of what nodes
  // defined elsewhere were referenced in this scope.

  // Replace old_decl with new_decl.
  void replace_scope (AST_Decl *old_decl,
                      AST_Decl *new_decl);

  // Replace old_decl with new_decl.
  void replace_referenced (AST_Decl *old_decl,
                           AST_Decl *new_decl);

  // Add to referenced nodes set.
  // If ex is not 0 'e' will be inserted at the position
  // after ex, which is already in the list.
  void add_to_referenced (AST_Decl *e,
                          idl_bool recursive,
                          Identifier *id,
                          AST_Decl *ex = 0);
                          
  // Add to local types. Node represents a local manifest type.
  void add_to_local_types (AST_Decl *e);

  // Has this node been referenced here already?
  virtual idl_bool referenced (AST_Decl *e,
                               Identifier *id = 0);

  // Look up a scoped name in the inherited list.
  virtual AST_Decl *look_in_inherited (UTL_ScopedName *,
                                       idl_bool treat_as_ref);
                                       
  // Look up a scoped name in the supported interface list.
  virtual AST_Decl *look_in_supported (UTL_ScopedName *,
                                       idl_bool treat_as_ref);
                                       
  // Lookup based on the local name.
  AST_Decl *lookup_for_add (AST_Decl *d,
                            idl_bool treat_as_ref);

  // Is there a (case-insensitive) clash between a local name
  // and an IDL keyword?
  int idl_keyword_clash (Identifier *e);

  // Checks for modules, or defns of forward declared struct or unions.
  idl_bool redef_clash (AST_Decl::NodeType new_nt,
                        AST_Decl::NodeType scope_elem_nt);
                        
  void check_for_predef_seq (AST_Decl *d);
  // Set the appropriate *_seen_ flag if we are seeing a spec-defined
  // sequence of a basic type.

protected:
  // Data.

  // What type is this node? This is a cache of the information
  // in AST_Decl
  const AST_Decl::NodeType pd_scope_node_type;

  // Storage for declarations in this scope.
  AST_Decl **pd_decls;                // Store declarations
  long pd_decls_allocated;            // How many allocated?
  long pd_decls_used;                 // How many used?

  // Storage for local manifest types in this scope.
  AST_Decl **pd_local_types;          // Store types
  long pd_locals_allocated;           // How many allocated?
  long pd_locals_used;                // How many used?

  // Storage for referenced nodes in this scope.
  AST_Decl **pd_referenced;           // Store references
  long pd_referenced_allocated;       // How many allocated?
  long  pd_referenced_used;           // How many used?

  // Storage for identifiers used in this scope. CORBA 2.3 introduced
  // stricter rules for clashes during name resolution, and the information
  // in pd_referenced is not enough to catch them all.
  Identifier **pd_name_referenced;    // Store name references
  long pd_name_referenced_allocated;  // How many allocated?
  long pd_name_referenced_used;       // How many used?

  // Have we seen a #pragma prefix declaration in this scope?
  idl_bool has_prefix_;

  // Friend class UTL_ScopeActiveIterator defines active iterator for
  // UTL_Scope. Definition follows below.
  friend class  UTL_ScopeActiveIterator;

private:
  friend int tao_yyparse (void);
  friend class AST_Enum;
  friend class IDL_GlobalData;

  // Scope Management Protocol.
  virtual AST_PredefinedType *fe_add_predefined_type (AST_PredefinedType *t);

  virtual AST_Module *fe_add_module (AST_Module *m);

  virtual AST_Interface *fe_add_interface (AST_Interface *i);

  virtual AST_InterfaceFwd *fe_add_interface_fwd (AST_InterfaceFwd *i);

  virtual AST_ValueType *fe_add_valuetype (AST_ValueType *i);

  virtual AST_ValueTypeFwd *fe_add_valuetype_fwd (AST_ValueTypeFwd *i);

  virtual AST_EventType *fe_add_eventtype (AST_EventType *i);

  virtual AST_EventTypeFwd *fe_add_eventtype_fwd (AST_EventTypeFwd *i);

  virtual AST_Component *fe_add_component (AST_Component *i);

  virtual AST_ComponentFwd *fe_add_component_fwd (AST_ComponentFwd *i);

  virtual AST_Home *fe_add_home (AST_Home *i);

  virtual AST_Constant *fe_add_constant (AST_Constant *i);

  virtual AST_Exception *fe_add_exception (AST_Exception *e);

  virtual AST_Attribute *fe_add_attribute (AST_Attribute *a);

  virtual AST_Operation *fe_add_operation (AST_Operation *o);

  virtual AST_Argument *fe_add_argument (AST_Argument *a);

  virtual AST_Union *fe_add_union (AST_Union *u);

  virtual AST_UnionFwd *fe_add_union_fwd (AST_UnionFwd *u);

  virtual AST_UnionBranch *fe_add_union_branch (AST_UnionBranch *b);

  virtual AST_Structure *fe_add_structure (AST_Structure *s);

  virtual AST_StructureFwd *fe_add_structure_fwd (AST_StructureFwd *s);

  virtual AST_Field *fe_add_field (AST_Field *f);

  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 UTL_StrList *fe_add_context (UTL_StrList *c);

  virtual UTL_NameList *fe_add_exceptions (UTL_NameList *e);

  virtual AST_Sequence *fe_add_sequence (AST_Sequence *s);

  virtual AST_String *fe_add_string (AST_String *s);

  virtual AST_Array *fe_add_array (AST_Array *a);

  virtual AST_Native *fe_add_native (AST_Native *n);

  virtual AST_Factory *fe_add_factory (AST_Factory *f);
};

// Active iterator for a UTL_Scope node
class TAO_IDL_FE_Export UTL_ScopeActiveIterator
{
public:
  // Operations.

  // Constructor.
  UTL_ScopeActiveIterator (UTL_Scope *s,
                           UTL_Scope::ScopeIterationKind ik);

  // Advance to next item.
  void next (void);

  // Get current item.
  AST_Decl *item (void);

  // Have we iterated over entire scope?
  idl_bool is_done (void);

  // What kind of iterator is this?
  UTL_Scope::ScopeIterationKind iteration_kind (void);

  // What stage are we in with this iterator?
  UTL_Scope::ScopeIterationKind iteration_stage (void);

private:
  // Scope to iterate over.
  UTL_Scope *iter_source;

  // What kind of iteration?
  UTL_Scope::ScopeIterationKind ik;

  // What stage?
  UTL_Scope::ScopeIterationKind stage;

  // What location in stage?
  long il;
};

#endif           // _UTL_SCOPE_UTL_SCOPE_HH
