New Language: Ada

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@45955 138bc75d-0d04-0410-961f-82ee72b054a4

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+------------------------------------------------------------------------------
+--                                                                          --
+--                         GNAT COMPILER COMPONENTS                         --
+--                                                                          --
+--                               K R U N C H                                --
+--                                                                          --
+--                                 S p e c                                  --
+--                                                                          --
+--                            $Revision: 1.13 $                             --
+--                                                                          --
+--          Copyright (C) 1992-1997 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 2,  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.  See the GNU General Public License --
+-- for  more details.  You should have  received  a copy of the GNU General --
+-- Public License  distributed with GNAT;  see file COPYING.  If not, write --
+-- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
+-- MA 02111-1307, USA.                                                      --
+--                                                                          --
+-- As a special exception,  if other files  instantiate  generics from this --
+-- unit, or you link  this unit with other files  to produce an executable, --
+-- this  unit  does not  by itself cause  the resulting  executable  to  be --
+-- covered  by the  GNU  General  Public  License.  This exception does not --
+-- however invalidate  any other reasons why  the executable file  might be --
+-- covered by the  GNU Public License.                                      --
+--                                                                          --
+-- GNAT was originally developed  by the GNAT team at  New York University. --
+-- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
+--                                                                          --
+------------------------------------------------------------------------------
+
+--  This procedure implements file name crunching
+
+--    First, the name is divided into segments separated by minus signs and
+--    underscores, then all minus signs and underscores are eliminated. If
+--    this leaves the name short enough, we are done.
+
+--    If not, then the longest segment is located (left-most if there are
+--    two of equal length), and shortened by dropping its last character.
+--    This is repeated until the name is short enough.
+
+--    As an example, consider the krunch of our-strings-wide_fixed.adb
+--    to fit the name into 8 characters as required by DOS:
+
+--      our-strings-wide_fixed      22
+--      our strings wide fixed      19
+--      our string  wide fixed      18
+--      our strin   wide fixed      17
+--      our stri    wide fixed      16
+--      our stri    wide fixe       15
+--      our str     wide fixe       14
+--      our str     wid  fixe       13
+--      our str     wid  fix        12
+--      ou  str     wid  fix        11
+--      ou  st      wid  fix        10
+--      ou  st      wi   fix         9
+--      ou  st      wi   fi          8
+
+--      Final file name: OUSTWIFX.ADB
+
+--    A special rule applies for children of System, Ada, Gnat, and Interfaces.
+--    In these cases, the following special prefix replacements occur:
+
+--       ada-        replaced by  a-
+--       gnat-       replaced by  g-
+--       interfaces- replaced by  i-
+--       system-     replaced by  s-
+
+--    The rest of the name is krunched in the usual manner described above.
+--    In addition, these names, as well as the names of the renamed packages
+--    from the obsolescent features annex, are always krunched to 8 characters
+--    regardless of the setting of Maxlen.
+
+--    As an example of this special rule, consider ada-strings-wide_fixed.adb
+--    which gets krunched as follows:
+
+--      ada-strings-wide_fixed      22
+--      a-  strings wide fixed      18
+--      a-  string  wide fixed      17
+--      a-  strin   wide fixed      16
+--      a-  stri    wide fixed      15
+--      a-  stri    wide fixe       14
+--      a-  str     wide fixe       13
+--      a-  str     wid  fixe       12
+--      a-  str     wid  fix        11
+--      a-  st      wid  fix        10
+--      a-  st      wi   fix         9
+--      a-  st      wi   fi          8
+
+--      Final file name: A-STWIFX.ADB
+
+--  Since children of units named A, G, I or S might conflict with the names
+--  of predefined units, the naming rule in that case is that the first hyphen
+--  is replaced by a tilde sign.
+
+--  Note: as described below, this special treatment of predefined library
+--  unit file names can be inhibited by setting the No_Predef flag.
+
+--  Of course there is no guarantee that this algorithm results in uniquely
+--  crunched names (nor, obviously, is there any algorithm which would do so)
+--  In fact we run into such a case in the standard library routines with
+--  children of Wide_Text_IO, so a special rule is applied to deal with this
+--  clash, namely the prefix ada-wide_text_io- is replaced by a-wt- and then
+--  the normal crunching rules are applied, so that for example, the unit:
+
+--    Ada.Wide_Text_IO.Float_IO
+
+--  has the file name
+
+--    a-wtflio
+
+--  This is the only irregularity required (so far!) to keep the file names
+--  unique in the standard predefined libraries.
+
+procedure Krunch
+  (Buffer    : in out String;
+   Len       : in out Natural;
+   Maxlen    : Natural;
+   No_Predef : Boolean);
+pragma Elaborate_Body (Krunch);
+--  The full file name is stored in Buffer (1 .. Len) on entry. The file
+--  name is crunched in place and on return Len is updated, so that the
+--  resulting krunched name is in Buffer (1 .. Len) where Len <= Maxlen.
+--  Note that Len may be less than or equal to Maxlen on entry, in which
+--  case it may be possible that Krunch does not modify Buffer. The fourth
+--  parameter, No_Predef, is a switch which, if set to True, disables the
+--  normal special treatment of predefined library unit file names.
+--
+--  Note: the string Buffer must have a lower bound of 1, and may not
+--  contain any blanks (in particular, it must not have leading blanks).