gcc/ada/s-valenu.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                      S Y S T E M . V A L _ E N U M                       --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2009, Free Software Foundation, Inc.         --
  10 --                                                                          --
  11 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  12 -- terms of the  GNU General Public License as published  by the Free Soft- --
  13 -- ware  Foundation;  either version 3,  or (at your option) any later ver- --
  14 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  15 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  16 -- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
  17 --                                                                          --
  18 -- As a special exception under Section 7 of GPL version 3, you are granted --
  19 -- additional permissions described in the GCC Runtime Library Exception,   --
  20 -- version 3.1, as published by the Free Software Foundation.               --
  21 --                                                                          --
  22 -- You should have received a copy of the GNU General Public License and    --
  23 -- a copy of the GCC Runtime Library Exception along with this program;     --
  24 -- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
  25 -- <http://www.gnu.org/licenses/>.                                          --
  26 --                                                                          --
  27 -- GNAT was originally developed  by the GNAT team at  New York University. --
  28 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  29 --                                                                          --
  30 ------------------------------------------------------------------------------
  31
  32 with Ada.Unchecked_Conversion;
  33 with System.Val_Util; use System.Val_Util;
  34
  35 package body System.Val_Enum is
  36
  37    -------------------------
  38    -- Value_Enumeration_8 --
  39    -------------------------
  40
  41    function Value_Enumeration_8
  42      (Names   : String;
  43       Indexes : System.Address;
  44       Num     : Natural;
  45       Str     : String)
  46       return    Natural
  47    is
  48       F : Natural;
  49       L : Natural;
  50       S : String (Str'Range) := Str;
  51
  52       type Natural_8 is range 0 .. 2 ** 7 - 1;
  53       type Index_Table is array (Natural) of Natural_8;
  54       type Index_Table_Ptr is access Index_Table;
  55
  56       function To_Index_Table_Ptr is
  57         new Ada.Unchecked_Conversion (System.Address, Index_Table_Ptr);
  58
  59       IndexesT : constant Index_Table_Ptr := To_Index_Table_Ptr (Indexes);
  60
  61    begin
  62       Normalize_String (S, F, L);
  63
  64       for J in 0 .. Num loop
  65          if Names
  66            (Natural (IndexesT (J)) ..
  67             Natural (IndexesT (J + 1)) - 1) = S (F .. L)
  68          then
  69             return J;
  70          end if;
  71       end loop;
  72
  73       raise Constraint_Error;
  74    end Value_Enumeration_8;
  75
  76    --------------------------
  77    -- Value_Enumeration_16 --
  78    --------------------------
  79
  80    function Value_Enumeration_16
  81      (Names   : String;
  82       Indexes : System.Address;
  83       Num     : Natural;
  84       Str     : String)
  85       return    Natural
  86    is
  87       F : Natural;
  88       L : Natural;
  89       S : String (Str'Range) := Str;
  90
  91       type Natural_16 is range 0 .. 2 ** 15 - 1;
  92       type Index_Table is array (Natural) of Natural_16;
  93       type Index_Table_Ptr is access Index_Table;
  94
  95       function To_Index_Table_Ptr is
  96         new Ada.Unchecked_Conversion (System.Address, Index_Table_Ptr);
  97
  98       IndexesT : constant Index_Table_Ptr := To_Index_Table_Ptr (Indexes);
  99
 100    begin
 101       Normalize_String (S, F, L);
 102
 103       for J in 0 .. Num loop
 104          if Names
 105            (Natural (IndexesT (J)) ..
 106             Natural (IndexesT (J + 1)) - 1) = S (F .. L)
 107          then
 108             return J;
 109          end if;
 110       end loop;
 111
 112       raise Constraint_Error;
 113    end Value_Enumeration_16;
 114
 115    --------------------------
 116    -- Value_Enumeration_32 --
 117    --------------------------
 118
 119    function Value_Enumeration_32
 120      (Names   : String;
 121       Indexes : System.Address;
 122       Num     : Natural;
 123       Str     : String)
 124       return    Natural
 125    is
 126       F : Natural;
 127       L : Natural;
 128       S : String (Str'Range) := Str;
 129
 130       type Natural_32 is range 0 .. 2 ** 31 - 1;
 131       type Index_Table is array (Natural) of Natural_32;
 132       type Index_Table_Ptr is access Index_Table;
 133
 134       function To_Index_Table_Ptr is
 135         new Ada.Unchecked_Conversion (System.Address, Index_Table_Ptr);
 136
 137       IndexesT : constant Index_Table_Ptr := To_Index_Table_Ptr (Indexes);
 138
 139    begin
 140       Normalize_String (S, F, L);
 141
 142       for J in 0 .. Num loop
 143          if Names
 144            (Natural (IndexesT (J)) ..
 145             Natural (IndexesT (J + 1)) - 1) = S (F .. L)
 146          then
 147             return J;
 148          end if;
 149       end loop;
 150
 151       raise Constraint_Error;
 152    end Value_Enumeration_32;
 153
 154 end System.Val_Enum;