gcc/ada/sfn_scan.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                             S F N _ S C A N                              --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --                                                                          --
  10 --          Copyright (C) 2000-2001 Free Software Foundation, Inc.          --
  11 --                                                                          --
  12 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  13 -- terms of the  GNU General Public License as published  by the Free Soft- --
  14 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  15 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  16 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  17 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  18 -- for  more details.  You should have  received  a copy of the GNU General --
  19 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  20 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  21 -- MA 02111-1307, USA.                                                      --
  22 --                                                                          --
  23 -- GNAT was originally developed  by the GNAT team at  New York University. --
  24 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  25 --                                                                          --
  26 ------------------------------------------------------------------------------
  27
  28 --  This package provides a stand alone capability for scanning a gnat.adc
  29 --  file for Source_File_Name pragmas. This is for use in tools other than
  30 --  the compiler, which want to scan source file name pragmas without the
  31 --  overhead of the full compiler scanner and parser.
  32
  33 --  Note that neither the package spec, nor the package body, of this
  34 --  unit contains any with statements at all. This is a compeltely
  35 --  independent package, suitable for incorporation into tools that do
  36 --  not access any other units in the GNAT compiler or tools sources.
  37
  38 --  This package is NOT task safe, so multiple tasks that may call the
  39 --  Scan_SFN_Pragmas procedure at the same time are responsibible for
  40 --  avoiding such multiple calls by appropriate synchronization.
  41
  42 package SFN_Scan is
  43
  44    --  The call to SFN_Scan passes pointers to two procedures that are
  45    --  used to store the results of scanning any Source_File_Name pragmas
  46    --  that are encountered. The following access types define the form
  47    --  of these procedures:
  48
  49    type Set_File_Name_Ptr is access
  50      procedure (Typ : Character; U : String; F : String);
  51    --  The procedure with this profile is called when a Source_File_Name
  52    --  pragma of the form having a unit name parameter. Typ is 'b' for
  53    --  a body file name, and 's' for a spec file name. U is a string that
  54    --  contains the unit name, exactly as it appeared in the source file,
  55    --  and F is the file taken from the second parameter.
  56
  57    type Set_File_Name_Pattern_Ptr is access
  58      procedure (Pat : String; Typ : Character; Dot : String; Cas : Character);
  59    --  This is called to process a Source_File_Name pragma whose first
  60    --  argument is a file pattern. Pat is this pattern string, which
  61    --  contains an asterisk to correspond to the unit. Typ is one of
  62    --  ('b'/'s'/'u') for body/spec/subunit, Dot is the separator string
  63    --  for child/subunit names (default is "."), and Cas is one of
  64    --  ('l'/'u'/'m') indicating the required case for the file name.
  65    --  The default setting for Cas is 'l' if no parameter is present.
  66
  67    Cursor : Natural;
  68    --  Used to record the cursor value if a syntax error is found
  69
  70    Syntax_Error_In_GNAT_ADC : exception;
  71    --  Exception raised if a syntax error is found
  72
  73    procedure Scan_SFN_Pragmas
  74      (Source   : String;
  75       SFN_Ptr  : Set_File_Name_Ptr;
  76       SFNP_Ptr : Set_File_Name_Pattern_Ptr);
  77    --  This is the procedure called to scan a gnat.adc file. The Source
  78    --  parameter points to the full text of the file, with normal line end
  79    --  characters, in the format normally read by the compiler. The two
  80    --  parameters SFN_Ptr and SFNP_Ptr point to procedures that will be
  81    --  called to register Source_File_Name pragmas as they are found.
  82    --
  83    --  If a syntax error is found, then Syntax_Error_In_GNAT_ADC is raised,
  84    --  and the location SFN_Scan.Cursor contains the approximate index of
  85    --  the error in the source string.
  86    --
  87    --  The scan assumes that it is dealing with a valid gnat.adc file,
  88    --  that includes only pragmas and comments. It does not do a full
  89    --  syntax correctness scan by any means, but if it does find anything
  90    --  that it can tell is wrong it will immediately raise the exception
  91    --  to indicate the aproximate location of the error
  92
  93 end SFN_Scan;