gcc/ada/namet-sp.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                             N A M E T . S P                              --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --            Copyright (C) 2008-2023, 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.  See the GNU General Public License --
  17 -- for  more details.  You should have  received  a copy of the GNU General --
  18 -- Public License  distributed with GNAT; see file COPYING3.  If not, go to --
  19 -- http://www.gnu.org/licenses for a complete copy of the license.          --
  20 --                                                                          --
  21 -- GNAT was originally developed  by the GNAT team at  New York University. --
  22 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  23 --                                                                          --
  24 ------------------------------------------------------------------------------
  25
  26 with Aspects;
  27 with Snames;
  28 with System.WCh_Cnv; use System.WCh_Cnv;
  29
  30 with GNAT.UTF_32_Spelling_Checker;
  31
  32 package body Namet.Sp is
  33
  34    -----------------------
  35    -- Local Subprograms --
  36    -----------------------
  37
  38    procedure Get_Name_String_UTF_32
  39      (Id     : Name_Id;
  40       Result : out UTF_32_String;
  41       Length : out Natural);
  42    --  This procedure is similar to Get_Decoded_Name except that the output
  43    --  is stored in the given Result array as single codes, so in particular
  44    --  any Uhh, Whhhh, or WWhhhhhhhh sequences are decoded to appear as a
  45    --  single value in the output. This call does not affect the contents of
  46    --  either Name_Buffer or Name_Len. The result is in Result (1 .. Length).
  47    --  The caller must ensure that the result buffer is long enough.
  48
  49    ------------------------
  50    -- Aspect_Spell_Check --
  51    ------------------------
  52
  53    function Aspect_Spell_Check (Name : Name_Id) return Boolean is
  54      (Aspect_Spell_Check (Name) /= No_Name);
  55
  56    function Aspect_Spell_Check (Name : Name_Id) return Name_Id is
  57       use Aspects;
  58    begin
  59       for J in Aspect_Id_Exclude_No_Aspect loop
  60          if Is_Bad_Spelling_Of (Name, Aspect_Names (J)) then
  61             return Aspect_Names (J);
  62          end if;
  63       end loop;
  64
  65       return No_Name;
  66    end Aspect_Spell_Check;
  67
  68    ---------------------------
  69    -- Attribute_Spell_Check --
  70    ---------------------------
  71
  72    function Attribute_Spell_Check (N : Name_Id) return Boolean is
  73      (Attribute_Spell_Check (N) /= No_Name);
  74
  75    function Attribute_Spell_Check (N : Name_Id) return Name_Id is
  76       use Snames;
  77    begin
  78       for J in First_Attribute_Name .. Last_Attribute_Name loop
  79          if Is_Bad_Spelling_Of (N, J) then
  80             return J;
  81          end if;
  82       end loop;
  83
  84       return No_Name;
  85    end Attribute_Spell_Check;
  86
  87    ----------------------------
  88    -- Get_Name_String_UTF_32 --
  89    ----------------------------
  90
  91    procedure Get_Name_String_UTF_32
  92      (Id     : Name_Id;
  93       Result : out UTF_32_String;
  94       Length : out Natural)
  95    is
  96       pragma Assert (Result'First = 1);
  97
  98       SPtr : Int := Name_Entries.Table (Id).Name_Chars_Index + 1;
  99       --  Index through characters of name in Name_Chars table. Initial value
 100       --  points to first character of the name.
 101
 102       SLen : constant Nat := Nat (Name_Entries.Table (Id).Name_Len);
 103       --  Length of the name
 104
 105       SLast : constant Int := SPtr + SLen - 1;
 106       --  Last index in Name_Chars table for name
 107
 108       C : Character;
 109       --  Current character from Name_Chars table
 110
 111       procedure Store_Hex (N : Natural);
 112       --  Read and store next N characters starting at SPtr and store result
 113       --  in next character of Result. Update SPtr past characters read.
 114
 115       ---------------
 116       -- Store_Hex --
 117       ---------------
 118
 119       procedure Store_Hex (N : Natural) is
 120          T : UTF_32_Code;
 121          C : Character;
 122
 123       begin
 124          T := 0;
 125          for J in 1 .. N loop
 126             C := Name_Chars.Table (SPtr);
 127             SPtr := SPtr + 1;
 128
 129             if C in '0' .. '9' then
 130                T := 16 * T + Character'Pos (C) - Character'Pos ('0');
 131             else
 132                pragma Assert (C in 'a' .. 'f');
 133
 134                T := 16 * T + Character'Pos (C) - (Character'Pos ('a') - 10);
 135             end if;
 136          end loop;
 137
 138          Length := Length + 1;
 139          pragma Assert (Length <= Result'Length);
 140          Result (Length) := T;
 141       end Store_Hex;
 142
 143    --  Start of processing for Get_Name_String_UTF_32
 144
 145    begin
 146       Length := 0;
 147       while SPtr <= SLast loop
 148          C := Name_Chars.Table (SPtr);
 149
 150          --  Uhh encoding
 151
 152          if C = 'U'
 153            and then SPtr <= SLast - 2
 154            and then Name_Chars.Table (SPtr + 1) not in 'A' .. 'Z'
 155          then
 156             SPtr := SPtr + 1;
 157             Store_Hex (2);
 158
 159          --  Whhhh encoding
 160
 161          elsif C = 'W'
 162            and then SPtr <= SLast - 4
 163            and then Name_Chars.Table (SPtr + 1) not in 'A' .. 'Z'
 164          then
 165             SPtr := SPtr + 1;
 166             Store_Hex (4);
 167
 168          --  WWhhhhhhhh encoding
 169
 170          elsif C = 'W'
 171            and then SPtr <= SLast - 8
 172            and then Name_Chars.Table (SPtr + 1) = 'W'
 173          then
 174             SPtr := SPtr + 2;
 175             Store_Hex (8);
 176
 177          --  Q encoding (character literal)
 178
 179          elsif C = 'Q' and then SPtr < SLast then
 180
 181             --  Put apostrophes around character
 182
 183             pragma Assert (Length <= Result'Last - 3);
 184             Result (Length + 1) := UTF_32_Code'Val (Character'Pos ('''));
 185             Result (Length + 2) :=
 186               UTF_32_Code (Get_Char_Code (Name_Chars.Table (SPtr + 1)));
 187             Result (Length + 3) := UTF_32_Code'Val (Character'Pos ('''));
 188             SPtr := SPtr + 2;
 189             Length := Length + 3;
 190
 191          --  Unencoded case
 192
 193          else
 194             SPtr := SPtr + 1;
 195             Length := Length + 1;
 196             pragma Assert (Length <= Result'Last);
 197             Result (Length) := UTF_32_Code (Get_Char_Code (C));
 198          end if;
 199       end loop;
 200    end Get_Name_String_UTF_32;
 201
 202    ------------------------
 203    -- Is_Bad_Spelling_Of --
 204    ------------------------
 205
 206    function Is_Bad_Spelling_Of (Found, Expect : Name_Id) return Boolean is
 207       FL : constant Natural := Natural (Length_Of_Name (Found));
 208       EL : constant Natural := Natural (Length_Of_Name (Expect));
 209       --  Length of input names
 210
 211       FB : UTF_32_String (1 .. 2 * FL);
 212       EB : UTF_32_String (1 .. 2 * EL);
 213       --  Buffers for results, a factor of 2 is more than enough, the only
 214       --  sequence which expands is Q (character literal) by 1.5 times.
 215
 216       FBL : Natural;
 217       EBL : Natural;
 218       --  Length of decoded names
 219
 220    begin
 221       Get_Name_String_UTF_32 (Found, FB, FBL);
 222       Get_Name_String_UTF_32 (Expect, EB, EBL);
 223
 224       --  For an exact match, return False, otherwise check bad spelling. We
 225       --  need this special test because the library routine returns True for
 226       --  an exact match.
 227
 228       if FB (1 .. FBL) = EB (1 .. EBL) then
 229          return False;
 230       else
 231          return
 232            GNAT.UTF_32_Spelling_Checker.Is_Bad_Spelling_Of
 233              (FB (1 .. FBL), EB (1 .. EBL));
 234       end if;
 235    end Is_Bad_Spelling_Of;
 236
 237 end Namet.Sp;