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------------------------------------------------------------------------------

--                                                                          --

--                         GNAT COMPILER COMPONENTS                         --

--                                                                          --

--                                U N A M E                                 --

--                                                                          --

--                                 S p e c                                  --

--                                                                          --

--          Copyright (C) 1992-2009  Free Software Foundation, Inc.         --

--                                                                          --

-- GNAT is free software;  you can  redistribute it  and/or modify it under --

-- terms of the  GNU General Public License as published  by the Free Soft- --

-- ware  Foundation;  either version 3,  or (at your option) any later ver- --

-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --

-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --

-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --

--                                                                          --

-- As a special exception under Section 7 of GPL version 3, you are granted --

-- additional permissions described in the GCC Runtime Library Exception,   --

-- version 3.1, as published by the Free Software Foundation.               --

--                                                                          --

-- You should have received a copy of the GNU General Public License and    --

-- a copy of the GCC Runtime Library Exception along with this program;     --

-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --

-- <http://www.gnu.org/licenses/>.                                          --

--                                                                          --

-- GNAT was originally developed  by the GNAT team at  New York University. --

-- Extensive contributions were provided by Ada Core Technologies Inc.      --

--                                                                          --

------------------------------------------------------------------------------

with Namet; use Namet;

with Types; use Types;

package Uname is

   ---------------------------

   -- Unit Name Conventions --

   ---------------------------

   --  Units are associated with a unique ASCII name as follows. First we have

   --  the fully expanded name of the unit, with lower case letters (except

   --  for the use of upper case letters for encoding upper half and wide

   --  characters, as described in Namet), and periods. Following this is one

   --  of the following suffixes:

   --    %s  for package/subprogram/generic declarations (specs)

   --    %b  for package/subprogram/generic bodies and subunits

   --  Unit names are stored in the names table, and referred to by the

   --  corresponding Name_Id values. The type Unit_Name_Type, derived from

   --  Name_Id, is used to indicate that a Name_Id value that holds a unit name

   --  (as defined above) is expected.

   --  Note: as far as possible the conventions for unit names are encapsulated

   --  in this package. The one exception is that package Fname, which provides

   --  conversion routines from unit names to file names must be aware of the

   --  precise conventions that are used.

   -------------------

   -- Display Names --

   -------------------

   --  For display purposes, unit names are printed out with the suffix

   --  " (body)" for a body and " (spec)" for a spec. These formats are

   --  used for the Write_Unit_Name and Get_Unit_Name_String subprograms.

   -----------------

   -- Subprograms --

   -----------------

   function Get_Body_Name (N : Unit_Name_Type) return Unit_Name_Type;

   --  Given the name of a spec, this function returns the name of the

   --  corresponding body, i.e. characters %s replaced by %b

   function Get_Parent_Body_Name (N : Unit_Name_Type) return Unit_Name_Type;

   --  Given the name of a subunit, returns the name of the parent body

   function Get_Parent_Spec_Name (N : Unit_Name_Type) return Unit_Name_Type;

   --  Given the name of a child unit spec or body, returns the unit name

   --  of the parent spec. Returns No_Name if the given name is not the name

   --  of a child unit.

   procedure Get_External_Unit_Name_String (N : Unit_Name_Type);

   --  Given the name of a body or spec unit, this procedure places in

   --  Name_Buffer the name of the unit with periods replaced by double

   --  underscores. The spec/body indication is eliminated. The length

   --  of the stored name is placed in Name_Len. All letters are lower

   --  case, corresponding to the string used in external names.

   function Get_Spec_Name (N : Unit_Name_Type) return Unit_Name_Type;

   --  Given the name of a body, this function returns the name of the

   --  corresponding spec, i.e. characters %b replaced by %s

   function Get_Unit_Name (N : Node_Id) return Unit_Name_Type;

   --  This procedure returns the unit name that corresponds to the given node,

   --  which is one of the following:

   --

   --    N_Subprogram_Declaration         (spec) cases

   --    N_Package_Declaration

   --    N_Generic_Declaration

   --    N_With_Clause

   --    N_Function_Instantiation

   --    N_Package_Instantiation

   --    N_Procedure_Instantiation

   --    N_Pragma (Elaborate case)

   --

   --    N_Package_Body                   (body) cases

   --    N_Subprogram_Body

   --    N_Identifier

   --    N_Selected_Component

   --

   --    N_Subprogram_Body_Stub           (subunit) cases

   --    N_Package_Body_Stub

   --    N_Task_Body_Stub

   --    N_Protected_Body_Stub

   --    N_Subunit

   procedure Get_Unit_Name_String

     (N      : Unit_Name_Type;

      Suffix : Boolean := True);

   --  Places the display name of the unit in Name_Buffer and sets Name_Len to

   --  the length of the stored name, i.e. it uses the same interface as the

   --  Get_Name_String routine in the Namet package. The name is decoded and

   --  contains an indication of spec or body if Boolean parameter Suffix is

   --  True.

   function Is_Body_Name (N : Unit_Name_Type) return Boolean;

   --  Returns True iff the given name is the unit name of a body (i.e. if

   --  it ends with the characters %b).

   function Is_Child_Name (N : Unit_Name_Type) return Boolean;

   --  Returns True iff the given name is a child unit name (of either a

   --  body or a spec).

   function Is_Spec_Name (N : Unit_Name_Type) return Boolean;

   --  Returns True iff the given name is the unit name of a specification

   --  (i.e. if it ends with the characters %s).

   function Name_To_Unit_Name (N : Name_Id) return Unit_Name_Type;

   --  Given the Id of the Ada name of a unit, this function returns the

   --  corresponding unit name of the spec (by appending %s to the name).

   function New_Child

     (Old  : Unit_Name_Type;

      Newp : Unit_Name_Type) return Unit_Name_Type;

   --   Old is a child unit name (for either a body or spec). Newp is the unit

   --   name of the actual parent (this may be different from the parent in

   --   old). The returned unit name is formed by taking the parent name from

   --   Newp and the child unit name from Old, with the result being a body or

   --   spec depending on Old. For example:

   --

   --     Old    = A.B.C (body)

   --     Newp   = A.R (spec)

   --     result = A.R.C (body)

   --

   --   See spec of Load_Unit for extensive discussion of why this routine

   --   needs to be used (the call in the body of Load_Unit is the only one).

   function Uname_Ge (Left, Right : Unit_Name_Type) return Boolean;

   function Uname_Gt (Left, Right : Unit_Name_Type) return Boolean;

   function Uname_Le (Left, Right : Unit_Name_Type) return Boolean;

   function Uname_Lt (Left, Right : Unit_Name_Type) return Boolean;

   --  These functions perform lexicographic ordering of unit names. The

   --  ordering is suitable for printing, and is not quite a straightforward

   --  comparison of the names, since the convention is that specs appear

   --  before bodies. Note that the standard = and /= operators work fine

   --  because all unit names are hashed into the name table, so if two names

   --  are the same, they always have the same Name_Id value.

   procedure Write_Unit_Name (N : Unit_Name_Type);

   --  Given a unit name, this procedure writes the display name to the

   --  standard output file. Name_Buffer and Name_Len are set as described

   --  above for the Get_Unit_Name_String call on return.

end Uname;