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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 _ C H A R --
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6 -- --
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7 -- B o d y --
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8 -- --
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145
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9 -- Copyright (C) 1992-2019, 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 with System.Val_Util; use System.Val_Util;
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33
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34 package body System.Val_Char is
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35
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36 ---------------------
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37 -- Value_Character --
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38 ---------------------
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39
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40 function Value_Character (Str : String) return Character is
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41 F : Natural;
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42 L : Natural;
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43 S : String (Str'Range) := Str;
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44
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45 begin
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46 Normalize_String (S, F, L);
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47
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48 -- Accept any single character enclosed in quotes
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49
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50 if L - F = 2 and then S (F) = ''' and then S (L) = ''' then
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51 return Character'Val (Character'Pos (S (F + 1)));
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52
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53 -- Check control character cases
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54
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55 else
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56 for C in Character'Val (16#00#) .. Character'Val (16#1F#) loop
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57 if S (F .. L) = Character'Image (C) then
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58 return C;
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59 end if;
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60 end loop;
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61
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62 for C in Character'Val (16#7F#) .. Character'Val (16#9F#) loop
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63 if S (F .. L) = Character'Image (C) then
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64 return C;
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65 end if;
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66 end loop;
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67
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68 if S (F .. L) = "SOFT_HYPHEN" then
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69 return Character'Val (16#AD#);
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70 end if;
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71
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72 Bad_Value (Str);
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73 end if;
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74 end Value_Character;
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75
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76 end System.Val_Char;
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