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) 1992-2012, 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
32with Ada.Unchecked_Conversion;
33
34with System.Val_Util; use System.Val_Util;
35
36package body System.Val_Enum is
37
38   -------------------------
39   -- Value_Enumeration_8 --
40   -------------------------
41
42   function Value_Enumeration_8
43     (Names   : String;
44      Indexes : System.Address;
45      Num     : Natural;
46      Str     : String)
47      return    Natural
48   is
49      F : Natural;
50      L : Natural;
51      S : String (Str'Range) := Str;
52
53      type Natural_8 is range 0 .. 2 ** 7 - 1;
54      type Index_Table is array (Natural) of Natural_8;
55      type Index_Table_Ptr is access Index_Table;
56
57      function To_Index_Table_Ptr is
58        new Ada.Unchecked_Conversion (System.Address, Index_Table_Ptr);
59
60      IndexesT : constant Index_Table_Ptr := To_Index_Table_Ptr (Indexes);
61
62   begin
63      Normalize_String (S, F, L);
64
65      for J in 0 .. Num loop
66         if Names
67           (Natural (IndexesT (J)) ..
68            Natural (IndexesT (J + 1)) - 1) = S (F .. L)
69         then
70            return J;
71         end if;
72      end loop;
73
74      Bad_Value (Str);
75   end Value_Enumeration_8;
76
77   --------------------------
78   -- Value_Enumeration_16 --
79   --------------------------
80
81   function Value_Enumeration_16
82     (Names   : String;
83      Indexes : System.Address;
84      Num     : Natural;
85      Str     : String)
86      return    Natural
87   is
88      F : Natural;
89      L : Natural;
90      S : String (Str'Range) := Str;
91
92      type Natural_16 is range 0 .. 2 ** 15 - 1;
93      type Index_Table is array (Natural) of Natural_16;
94      type Index_Table_Ptr is access Index_Table;
95
96      function To_Index_Table_Ptr is
97        new Ada.Unchecked_Conversion (System.Address, Index_Table_Ptr);
98
99      IndexesT : constant Index_Table_Ptr := To_Index_Table_Ptr (Indexes);
100
101   begin
102      Normalize_String (S, F, L);
103
104      for J in 0 .. Num loop
105         if Names
106           (Natural (IndexesT (J)) ..
107            Natural (IndexesT (J + 1)) - 1) = S (F .. L)
108         then
109            return J;
110         end if;
111      end loop;
112
113      Bad_Value (Str);
114   end Value_Enumeration_16;
115
116   --------------------------
117   -- Value_Enumeration_32 --
118   --------------------------
119
120   function Value_Enumeration_32
121     (Names   : String;
122      Indexes : System.Address;
123      Num     : Natural;
124      Str     : String)
125      return    Natural
126   is
127      F : Natural;
128      L : Natural;
129      S : String (Str'Range) := Str;
130
131      type Natural_32 is range 0 .. 2 ** 31 - 1;
132      type Index_Table is array (Natural) of Natural_32;
133      type Index_Table_Ptr is access Index_Table;
134
135      function To_Index_Table_Ptr is
136        new Ada.Unchecked_Conversion (System.Address, Index_Table_Ptr);
137
138      IndexesT : constant Index_Table_Ptr := To_Index_Table_Ptr (Indexes);
139
140   begin
141      Normalize_String (S, F, L);
142
143      for J in 0 .. Num loop
144         if Names
145           (Natural (IndexesT (J)) ..
146            Natural (IndexesT (J + 1)) - 1) = S (F .. L)
147         then
148            return J;
149         end if;
150      end loop;
151
152      Bad_Value (Str);
153   end Value_Enumeration_32;
154
155end System.Val_Enum;
156