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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT COMPILER COMPONENTS --
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4 -- --
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5 -- S Y S T E M . V A L _ E N U M --
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6 -- --
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7 -- S p e c --
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8 -- --
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131
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9 -- Copyright (C) 1992-2018, Free Software Foundation, Inc. --
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111
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10 -- --
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11 -- GNAT is free software; you can redistribute it and/or modify it under --
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12 -- terms of the GNU General Public License as published by the Free Soft- --
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13 -- ware Foundation; either version 3, or (at your option) any later ver- --
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14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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16 -- or FITNESS FOR A PARTICULAR PURPOSE. --
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17 -- --
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18 -- As a special exception under Section 7 of GPL version 3, you are granted --
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19 -- additional permissions described in the GCC Runtime Library Exception, --
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20 -- version 3.1, as published by the Free Software Foundation. --
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21 -- --
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22 -- You should have received a copy of the GNU General Public License and --
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23 -- a copy of the GCC Runtime Library Exception along with this program; --
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24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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25 -- <http://www.gnu.org/licenses/>. --
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26 -- --
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27 -- GNAT was originally developed by the GNAT team at New York University. --
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28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
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29 -- --
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30 ------------------------------------------------------------------------------
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31
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32 -- This package is used to compute the Value attribute for enumeration types
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33 -- other than those in packages Standard and System. See unit Exp_Imgv for
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34 -- details of the format of constructed image tables.
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35
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36 package System.Val_Enum is
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37 pragma Pure;
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38
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39 function Value_Enumeration_8
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40 (Names : String;
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41 Indexes : System.Address;
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42 Num : Natural;
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43 Str : String)
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44 return Natural;
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45 -- Used to compute Enum'Value (Str) where Enum is some enumeration type
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46 -- other than those defined in package Standard. Names is a string with
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47 -- a lower bound of 1 containing the characters of all the enumeration
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48 -- literals concatenated together in sequence. Indexes is the address
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49 -- of an array of type array (0 .. N) of Natural_8, where N is the
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50 -- number of enumeration literals in the type. The Indexes values are
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51 -- the starting subscript of each enumeration literal, indexed by Pos
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52 -- values, with an extra entry at the end containing Names'Length + 1.
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53 -- The parameter Num is the value N - 1 (i.e. Enum'Pos (Enum'Last)).
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54 -- The reason that Indexes is passed by address is that the actual type
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55 -- is created on the fly by the expander.
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56 --
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57 -- Str is the argument of the attribute function, and may have leading
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58 -- and trailing spaces, and letters can be upper or lower case or mixed.
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59 -- If the image is found in Names, then the corresponding Pos value is
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60 -- returned. If not, Constraint_Error is raised.
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61
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62 function Value_Enumeration_16
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63 (Names : String;
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64 Indexes : System.Address;
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65 Num : Natural;
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66 Str : String)
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67 return Natural;
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68 -- Identical to Value_Enumeration_8 except that it handles types
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69 -- using array (0 .. Num) of Natural_16 for the Indexes table.
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70
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71 function Value_Enumeration_32
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72 (Names : String;
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73 Indexes : System.Address;
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74 Num : Natural;
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75 Str : String)
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76 return Natural;
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77 -- Identical to Value_Enumeration_8 except that it handles types
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78 -- using array (0 .. Num) of Natural_32 for the Indexes table.
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79
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80 end System.Val_Enum;
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