gcc/ada/a-chahan.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT RUN-TIME COMPONENTS                         --
   4 --                                                                          --
   5 --              A D A . C H A R A C T E R S . H A N D L I N G               --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2005, 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 2,  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 COPYING.  If not, write --
  19 -- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --
  20 -- Boston, MA 02110-1301, USA.                                              --
  21 --                                                                          --
  22 -- As a special exception,  if other files  instantiate  generics from this --
  23 -- unit, or you link  this unit with other files  to produce an executable, --
  24 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  25 -- covered  by the  GNU  General  Public  License.  This exception does not --
  26 -- however invalidate  any other reasons why  the executable file  might be --
  27 -- covered by the  GNU Public License.                                      --
  28 --                                                                          --
  29 -- GNAT was originally developed  by the GNAT team at  New York University. --
  30 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  31 --                                                                          --
  32 ------------------------------------------------------------------------------
  33
  34 with Ada.Characters.Latin_1;     use Ada.Characters.Latin_1;
  35 with Ada.Strings.Maps;           use Ada.Strings.Maps;
  36 with Ada.Strings.Maps.Constants; use Ada.Strings.Maps.Constants;
  37
  38 package body Ada.Characters.Handling is
  39
  40    ------------------------------------
  41    -- Character Classification Table --
  42    ------------------------------------
  43
  44    type Character_Flags is mod 256;
  45    for Character_Flags'Size use 8;
  46
  47    Control    : constant Character_Flags := 1;
  48    Lower      : constant Character_Flags := 2;
  49    Upper      : constant Character_Flags := 4;
  50    Basic      : constant Character_Flags := 8;
  51    Hex_Digit  : constant Character_Flags := 16;
  52    Digit      : constant Character_Flags := 32;
  53    Special    : constant Character_Flags := 64;
  54
  55    Letter     : constant Character_Flags := Lower or Upper;
  56    Alphanum   : constant Character_Flags := Letter or Digit;
  57    Graphic    : constant Character_Flags := Alphanum or Special;
  58
  59    Char_Map : constant array (Character) of Character_Flags :=
  60    (
  61      NUL                         => Control,
  62      SOH                         => Control,
  63      STX                         => Control,
  64      ETX                         => Control,
  65      EOT                         => Control,
  66      ENQ                         => Control,
  67      ACK                         => Control,
  68      BEL                         => Control,
  69      BS                          => Control,
  70      HT                          => Control,
  71      LF                          => Control,
  72      VT                          => Control,
  73      FF                          => Control,
  74      CR                          => Control,
  75      SO                          => Control,
  76      SI                          => Control,
  77
  78      DLE                         => Control,
  79      DC1                         => Control,
  80      DC2                         => Control,
  81      DC3                         => Control,
  82      DC4                         => Control,
  83      NAK                         => Control,
  84      SYN                         => Control,
  85      ETB                         => Control,
  86      CAN                         => Control,
  87      EM                          => Control,
  88      SUB                         => Control,
  89      ESC                         => Control,
  90      FS                          => Control,
  91      GS                          => Control,
  92      RS                          => Control,
  93      US                          => Control,
  94
  95      Space                       => Special,
  96      Exclamation                 => Special,
  97      Quotation                   => Special,
  98      Number_Sign                 => Special,
  99      Dollar_Sign                 => Special,
 100      Percent_Sign                => Special,
 101      Ampersand                   => Special,
 102      Apostrophe                  => Special,
 103      Left_Parenthesis            => Special,
 104      Right_Parenthesis           => Special,
 105      Asterisk                    => Special,
 106      Plus_Sign                   => Special,
 107      Comma                       => Special,
 108      Hyphen                      => Special,
 109      Full_Stop                   => Special,
 110      Solidus                     => Special,
 111
 112      '0' .. '9'                  => Digit + Hex_Digit,
 113
 114      Colon                       => Special,
 115      Semicolon                   => Special,
 116      Less_Than_Sign              => Special,
 117      Equals_Sign                 => Special,
 118      Greater_Than_Sign           => Special,
 119      Question                    => Special,
 120      Commercial_At               => Special,
 121
 122      'A' .. 'F'                  => Upper + Basic + Hex_Digit,
 123      'G' .. 'Z'                  => Upper + Basic,
 124
 125      Left_Square_Bracket         => Special,
 126      Reverse_Solidus             => Special,
 127      Right_Square_Bracket        => Special,
 128      Circumflex                  => Special,
 129      Low_Line                    => Special,
 130      Grave                       => Special,
 131
 132      'a' .. 'f'                  => Lower + Basic + Hex_Digit,
 133      'g' .. 'z'                  => Lower + Basic,
 134
 135      Left_Curly_Bracket          => Special,
 136      Vertical_Line               => Special,
 137      Right_Curly_Bracket         => Special,
 138      Tilde                       => Special,
 139
 140      DEL                         => Control,
 141      Reserved_128                => Control,
 142      Reserved_129                => Control,
 143      BPH                         => Control,
 144      NBH                         => Control,
 145      Reserved_132                => Control,
 146      NEL                         => Control,
 147      SSA                         => Control,
 148      ESA                         => Control,
 149      HTS                         => Control,
 150      HTJ                         => Control,
 151      VTS                         => Control,
 152      PLD                         => Control,
 153      PLU                         => Control,
 154      RI                          => Control,
 155      SS2                         => Control,
 156      SS3                         => Control,
 157
 158      DCS                         => Control,
 159      PU1                         => Control,
 160      PU2                         => Control,
 161      STS                         => Control,
 162      CCH                         => Control,
 163      MW                          => Control,
 164      SPA                         => Control,
 165      EPA                         => Control,
 166
 167      SOS                         => Control,
 168      Reserved_153                => Control,
 169      SCI                         => Control,
 170      CSI                         => Control,
 171      ST                          => Control,
 172      OSC                         => Control,
 173      PM                          => Control,
 174      APC                         => Control,
 175
 176      No_Break_Space              => Special,
 177      Inverted_Exclamation        => Special,
 178      Cent_Sign                   => Special,
 179      Pound_Sign                  => Special,
 180      Currency_Sign               => Special,
 181      Yen_Sign                    => Special,
 182      Broken_Bar                  => Special,
 183      Section_Sign                => Special,
 184      Diaeresis                   => Special,
 185      Copyright_Sign              => Special,
 186      Feminine_Ordinal_Indicator  => Special,
 187      Left_Angle_Quotation        => Special,
 188      Not_Sign                    => Special,
 189      Soft_Hyphen                 => Special,
 190      Registered_Trade_Mark_Sign  => Special,
 191      Macron                      => Special,
 192      Degree_Sign                 => Special,
 193      Plus_Minus_Sign             => Special,
 194      Superscript_Two             => Special,
 195      Superscript_Three           => Special,
 196      Acute                       => Special,
 197      Micro_Sign                  => Special,
 198      Pilcrow_Sign                => Special,
 199      Middle_Dot                  => Special,
 200      Cedilla                     => Special,
 201      Superscript_One             => Special,
 202      Masculine_Ordinal_Indicator => Special,
 203      Right_Angle_Quotation       => Special,
 204      Fraction_One_Quarter        => Special,
 205      Fraction_One_Half           => Special,
 206      Fraction_Three_Quarters     => Special,
 207      Inverted_Question           => Special,
 208
 209      UC_A_Grave                  => Upper,
 210      UC_A_Acute                  => Upper,
 211      UC_A_Circumflex             => Upper,
 212      UC_A_Tilde                  => Upper,
 213      UC_A_Diaeresis              => Upper,
 214      UC_A_Ring                   => Upper,
 215      UC_AE_Diphthong             => Upper + Basic,
 216      UC_C_Cedilla                => Upper,
 217      UC_E_Grave                  => Upper,
 218      UC_E_Acute                  => Upper,
 219      UC_E_Circumflex             => Upper,
 220      UC_E_Diaeresis              => Upper,
 221      UC_I_Grave                  => Upper,
 222      UC_I_Acute                  => Upper,
 223      UC_I_Circumflex             => Upper,
 224      UC_I_Diaeresis              => Upper,
 225      UC_Icelandic_Eth            => Upper + Basic,
 226      UC_N_Tilde                  => Upper,
 227      UC_O_Grave                  => Upper,
 228      UC_O_Acute                  => Upper,
 229      UC_O_Circumflex             => Upper,
 230      UC_O_Tilde                  => Upper,
 231      UC_O_Diaeresis              => Upper,
 232
 233      Multiplication_Sign         => Special,
 234
 235      UC_O_Oblique_Stroke         => Upper,
 236      UC_U_Grave                  => Upper,
 237      UC_U_Acute                  => Upper,
 238      UC_U_Circumflex             => Upper,
 239      UC_U_Diaeresis              => Upper,
 240      UC_Y_Acute                  => Upper,
 241      UC_Icelandic_Thorn          => Upper + Basic,
 242
 243      LC_German_Sharp_S           => Lower + Basic,
 244      LC_A_Grave                  => Lower,
 245      LC_A_Acute                  => Lower,
 246      LC_A_Circumflex             => Lower,
 247      LC_A_Tilde                  => Lower,
 248      LC_A_Diaeresis              => Lower,
 249      LC_A_Ring                   => Lower,
 250      LC_AE_Diphthong             => Lower + Basic,
 251      LC_C_Cedilla                => Lower,
 252      LC_E_Grave                  => Lower,
 253      LC_E_Acute                  => Lower,
 254      LC_E_Circumflex             => Lower,
 255      LC_E_Diaeresis              => Lower,
 256      LC_I_Grave                  => Lower,
 257      LC_I_Acute                  => Lower,
 258      LC_I_Circumflex             => Lower,
 259      LC_I_Diaeresis              => Lower,
 260      LC_Icelandic_Eth            => Lower + Basic,
 261      LC_N_Tilde                  => Lower,
 262      LC_O_Grave                  => Lower,
 263      LC_O_Acute                  => Lower,
 264      LC_O_Circumflex             => Lower,
 265      LC_O_Tilde                  => Lower,
 266      LC_O_Diaeresis              => Lower,
 267
 268      Division_Sign               => Special,
 269
 270      LC_O_Oblique_Stroke         => Lower,
 271      LC_U_Grave                  => Lower,
 272      LC_U_Acute                  => Lower,
 273      LC_U_Circumflex             => Lower,
 274      LC_U_Diaeresis              => Lower,
 275      LC_Y_Acute                  => Lower,
 276      LC_Icelandic_Thorn          => Lower + Basic,
 277      LC_Y_Diaeresis              => Lower
 278    );
 279
 280    ---------------------
 281    -- Is_Alphanumeric --
 282    ---------------------
 283
 284    function Is_Alphanumeric (Item : Character) return Boolean is
 285    begin
 286       return (Char_Map (Item) and Alphanum) /= 0;
 287    end Is_Alphanumeric;
 288
 289    --------------
 290    -- Is_Basic --
 291    --------------
 292
 293    function Is_Basic (Item : Character) return Boolean is
 294    begin
 295       return (Char_Map (Item) and Basic) /= 0;
 296    end Is_Basic;
 297
 298    ------------------
 299    -- Is_Character --
 300    ------------------
 301
 302    function Is_Character (Item : Wide_Character) return Boolean is
 303    begin
 304       return Wide_Character'Pos (Item) < 256;
 305    end Is_Character;
 306
 307    ----------------
 308    -- Is_Control --
 309    ----------------
 310
 311    function Is_Control (Item : Character) return Boolean is
 312    begin
 313       return (Char_Map (Item) and Control) /= 0;
 314    end Is_Control;
 315
 316    --------------
 317    -- Is_Digit --
 318    --------------
 319
 320    function Is_Digit (Item : Character) return Boolean is
 321    begin
 322       return Item in '0' .. '9';
 323    end Is_Digit;
 324
 325    ----------------
 326    -- Is_Graphic --
 327    ----------------
 328
 329    function Is_Graphic (Item : Character) return Boolean is
 330    begin
 331       return (Char_Map (Item) and Graphic) /= 0;
 332    end Is_Graphic;
 333
 334    --------------------------
 335    -- Is_Hexadecimal_Digit --
 336    --------------------------
 337
 338    function Is_Hexadecimal_Digit (Item : Character) return Boolean is
 339    begin
 340       return (Char_Map (Item) and Hex_Digit) /= 0;
 341    end Is_Hexadecimal_Digit;
 342
 343    ----------------
 344    -- Is_ISO_646 --
 345    ----------------
 346
 347    function Is_ISO_646 (Item : Character) return Boolean is
 348    begin
 349       return Item in ISO_646;
 350    end Is_ISO_646;
 351
 352    --  Note: much more efficient coding of the following function is possible
 353    --  by testing several 16#80# bits in a complete word in a single operation
 354
 355    function Is_ISO_646 (Item : String) return Boolean is
 356    begin
 357       for J in Item'Range loop
 358          if Item (J) not in ISO_646 then
 359             return False;
 360          end if;
 361       end loop;
 362
 363       return True;
 364    end Is_ISO_646;
 365
 366    ---------------
 367    -- Is_Letter --
 368    ---------------
 369
 370    function Is_Letter (Item : Character) return Boolean is
 371    begin
 372       return (Char_Map (Item) and Letter) /= 0;
 373    end Is_Letter;
 374
 375    --------------
 376    -- Is_Lower --
 377    --------------
 378
 379    function Is_Lower (Item : Character) return Boolean is
 380    begin
 381       return (Char_Map (Item) and Lower) /= 0;
 382    end Is_Lower;
 383
 384    ----------------
 385    -- Is_Special --
 386    ----------------
 387
 388    function Is_Special (Item : Character) return Boolean is
 389    begin
 390       return (Char_Map (Item) and Special) /= 0;
 391    end Is_Special;
 392
 393    ---------------
 394    -- Is_String --
 395    ---------------
 396
 397    function Is_String (Item : Wide_String) return Boolean is
 398    begin
 399       for J in Item'Range loop
 400          if Wide_Character'Pos (Item (J)) >= 256 then
 401             return False;
 402          end if;
 403       end loop;
 404
 405       return True;
 406    end Is_String;
 407
 408    --------------
 409    -- Is_Upper --
 410    --------------
 411
 412    function Is_Upper (Item : Character) return Boolean is
 413    begin
 414       return (Char_Map (Item) and Upper) /= 0;
 415    end Is_Upper;
 416
 417    --------------
 418    -- To_Basic --
 419    --------------
 420
 421    function To_Basic (Item : Character) return Character is
 422    begin
 423       return Value (Basic_Map, Item);
 424    end To_Basic;
 425
 426    function To_Basic (Item : String) return String is
 427       Result : String (1 .. Item'Length);
 428
 429    begin
 430       for J in Item'Range loop
 431          Result (J - (Item'First - 1)) := Value (Basic_Map, Item (J));
 432       end loop;
 433
 434       return Result;
 435    end To_Basic;
 436
 437    ------------------
 438    -- To_Character --
 439    ------------------
 440
 441    function To_Character
 442      (Item       : Wide_Character;
 443       Substitute : Character := ' ') return Character
 444    is
 445    begin
 446       if Is_Character (Item) then
 447          return Character'Val (Wide_Character'Pos (Item));
 448       else
 449          return Substitute;
 450       end if;
 451    end To_Character;
 452
 453    ----------------
 454    -- To_ISO_646 --
 455    ----------------
 456
 457    function To_ISO_646
 458      (Item       : Character;
 459       Substitute : ISO_646 := ' ') return ISO_646
 460    is
 461    begin
 462       if Item in ISO_646 then
 463          return Item;
 464       else
 465          return Substitute;
 466       end if;
 467    end To_ISO_646;
 468
 469    function To_ISO_646
 470      (Item       : String;
 471       Substitute : ISO_646 := ' ') return String
 472    is
 473       Result : String (1 .. Item'Length);
 474
 475    begin
 476       for J in Item'Range loop
 477          if Item (J) in ISO_646 then
 478             Result (J - (Item'First - 1)) := Item (J);
 479          else
 480             Result (J - (Item'First - 1)) := Substitute;
 481          end if;
 482       end loop;
 483
 484       return Result;
 485    end To_ISO_646;
 486
 487    --------------
 488    -- To_Lower --
 489    --------------
 490
 491    function To_Lower (Item : Character) return Character is
 492    begin
 493       return Value (Lower_Case_Map, Item);
 494    end To_Lower;
 495
 496    function To_Lower (Item : String) return String is
 497       Result : String (1 .. Item'Length);
 498
 499    begin
 500       for J in Item'Range loop
 501          Result (J - (Item'First - 1)) := Value (Lower_Case_Map, Item (J));
 502       end loop;
 503
 504       return Result;
 505    end To_Lower;
 506
 507    ---------------
 508    -- To_String --
 509    ---------------
 510
 511    function To_String
 512      (Item       : Wide_String;
 513       Substitute : Character := ' ') return String
 514    is
 515       Result : String (1 .. Item'Length);
 516
 517    begin
 518       for J in Item'Range loop
 519          Result (J - (Item'First - 1)) := To_Character (Item (J), Substitute);
 520       end loop;
 521
 522       return Result;
 523    end To_String;
 524
 525    --------------
 526    -- To_Upper --
 527    --------------
 528
 529    function To_Upper
 530      (Item : Character) return Character
 531    is
 532    begin
 533       return Value (Upper_Case_Map, Item);
 534    end To_Upper;
 535
 536    function To_Upper
 537      (Item : String) return String
 538    is
 539       Result : String (1 .. Item'Length);
 540
 541    begin
 542       for J in Item'Range loop
 543          Result (J - (Item'First - 1)) := Value (Upper_Case_Map, Item (J));
 544       end loop;
 545
 546       return Result;
 547    end To_Upper;
 548
 549    -----------------------
 550    -- To_Wide_Character --
 551    -----------------------
 552
 553    function To_Wide_Character
 554      (Item : Character) return Wide_Character
 555    is
 556    begin
 557       return Wide_Character'Val (Character'Pos (Item));
 558    end To_Wide_Character;
 559
 560    --------------------
 561    -- To_Wide_String --
 562    --------------------
 563
 564    function To_Wide_String
 565      (Item : String) return Wide_String
 566    is
 567       Result : Wide_String (1 .. Item'Length);
 568
 569    begin
 570       for J in Item'Range loop
 571          Result (J - (Item'First - 1)) := To_Wide_Character (Item (J));
 572       end loop;
 573
 574       return Result;
 575    end To_Wide_String;
 576
 577 end Ada.Characters.Handling;