gcc/ada/a-wtedit.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                        GNAT RUN-TIME COMPONENTS                          --
   4 --                                                                          --
   5 --             A D A . W I D E _ T E X T _ I O . E D I T I N G              --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2009, 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
  32 with Ada.Strings.Fixed;
  33 with Ada.Strings.Wide_Fixed;
  34
  35 package body Ada.Wide_Text_IO.Editing is
  36
  37    package Strings            renames Ada.Strings;
  38    package Strings_Fixed      renames Ada.Strings.Fixed;
  39    package Strings_Wide_Fixed renames Ada.Strings.Wide_Fixed;
  40    package Wide_Text_IO       renames Ada.Wide_Text_IO;
  41
  42    -----------------------
  43    -- Local_Subprograms --
  44    -----------------------
  45
  46    function To_Wide (C : Character) return Wide_Character;
  47    pragma Inline (To_Wide);
  48    --  Convert Character to corresponding Wide_Character
  49
  50    ---------------------
  51    -- Blank_When_Zero --
  52    ---------------------
  53
  54    function Blank_When_Zero (Pic : Picture) return Boolean is
  55    begin
  56       return Pic.Contents.Original_BWZ;
  57    end Blank_When_Zero;
  58
  59    --------------------
  60    -- Decimal_Output --
  61    --------------------
  62
  63    package body Decimal_Output is
  64
  65       -----------
  66       -- Image --
  67       -----------
  68
  69       function Image
  70         (Item       : Num;
  71          Pic        : Picture;
  72          Currency   : Wide_String    := Default_Currency;
  73          Fill       : Wide_Character := Default_Fill;
  74          Separator  : Wide_Character := Default_Separator;
  75          Radix_Mark : Wide_Character := Default_Radix_Mark) return Wide_String
  76       is
  77       begin
  78          return Format_Number
  79             (Pic.Contents, Num'Image (Item),
  80              Currency, Fill, Separator, Radix_Mark);
  81       end Image;
  82
  83       ------------
  84       -- Length --
  85       ------------
  86
  87       function Length
  88         (Pic      : Picture;
  89          Currency : Wide_String := Default_Currency) return Natural
  90       is
  91          Picstr     : constant String := Pic_String (Pic);
  92          V_Adjust   : Integer := 0;
  93          Cur_Adjust : Integer := 0;
  94
  95       begin
  96          --  Check if Picstr has 'V' or '$'
  97
  98          --  If 'V', then length is 1 less than otherwise
  99
 100          --  If '$', then length is Currency'Length-1 more than otherwise
 101
 102          --  This should use the string handling package ???
 103
 104          for J in Picstr'Range loop
 105             if Picstr (J) = 'V' then
 106                V_Adjust := -1;
 107
 108             elsif Picstr (J) = '$' then
 109                Cur_Adjust := Currency'Length - 1;
 110             end if;
 111          end loop;
 112
 113          return Picstr'Length - V_Adjust + Cur_Adjust;
 114       end Length;
 115
 116       ---------
 117       -- Put --
 118       ---------
 119
 120       procedure Put
 121         (File       : Wide_Text_IO.File_Type;
 122          Item       : Num;
 123          Pic        : Picture;
 124          Currency   : Wide_String    := Default_Currency;
 125          Fill       : Wide_Character := Default_Fill;
 126          Separator  : Wide_Character := Default_Separator;
 127          Radix_Mark : Wide_Character := Default_Radix_Mark)
 128       is
 129       begin
 130          Wide_Text_IO.Put (File, Image (Item, Pic,
 131                                    Currency, Fill, Separator, Radix_Mark));
 132       end Put;
 133
 134       procedure Put
 135         (Item       : Num;
 136          Pic        : Picture;
 137          Currency   : Wide_String    := Default_Currency;
 138          Fill       : Wide_Character := Default_Fill;
 139          Separator  : Wide_Character := Default_Separator;
 140          Radix_Mark : Wide_Character := Default_Radix_Mark)
 141       is
 142       begin
 143          Wide_Text_IO.Put (Image (Item, Pic,
 144                              Currency, Fill, Separator, Radix_Mark));
 145       end Put;
 146
 147       procedure Put
 148         (To         : out Wide_String;
 149          Item       : Num;
 150          Pic        : Picture;
 151          Currency   : Wide_String    := Default_Currency;
 152          Fill       : Wide_Character := Default_Fill;
 153          Separator  : Wide_Character := Default_Separator;
 154          Radix_Mark : Wide_Character := Default_Radix_Mark)
 155       is
 156          Result : constant Wide_String :=
 157            Image (Item, Pic, Currency, Fill, Separator, Radix_Mark);
 158
 159       begin
 160          if Result'Length > To'Length then
 161             raise Wide_Text_IO.Layout_Error;
 162          else
 163             Strings_Wide_Fixed.Move (Source => Result, Target => To,
 164                                      Justify => Strings.Right);
 165          end if;
 166       end Put;
 167
 168       -----------
 169       -- Valid --
 170       -----------
 171
 172       function Valid
 173         (Item     : Num;
 174          Pic      : Picture;
 175          Currency : Wide_String := Default_Currency) return Boolean
 176       is
 177       begin
 178          declare
 179             Temp : constant Wide_String := Image (Item, Pic, Currency);
 180             pragma Warnings (Off, Temp);
 181          begin
 182             return True;
 183          end;
 184
 185       exception
 186          when Layout_Error => return False;
 187
 188       end Valid;
 189    end Decimal_Output;
 190
 191    ------------
 192    -- Expand --
 193    ------------
 194
 195    function Expand (Picture : String) return String is
 196       Result        : String (1 .. MAX_PICSIZE);
 197       Picture_Index : Integer := Picture'First;
 198       Result_Index  : Integer := Result'First;
 199       Count         : Natural;
 200       Last          : Integer;
 201
 202    begin
 203       if Picture'Length < 1 then
 204          raise Picture_Error;
 205       end if;
 206
 207       if Picture (Picture'First) = '(' then
 208          raise Picture_Error;
 209       end if;
 210
 211       loop
 212          case Picture (Picture_Index) is
 213
 214             when '(' =>
 215
 216                --  We now need to scan out the count after a left paren. In
 217                --  the non-wide version we used Integer_IO.Get, but that is
 218                --  not convenient here, since we don't want to drag in normal
 219                --  Text_IO just for this purpose. So we do the scan ourselves,
 220                --  with the normal validity checks.
 221
 222                Last := Picture_Index + 1;
 223                Count := 0;
 224
 225                if Picture (Last) not in '0' .. '9' then
 226                   raise Picture_Error;
 227                end if;
 228
 229                Count := Character'Pos (Picture (Last)) - Character'Pos ('0');
 230                Last := Last + 1;
 231
 232                loop
 233                   if Last > Picture'Last then
 234                      raise Picture_Error;
 235                   end if;
 236
 237                   if Picture (Last) = '_' then
 238                      if Picture (Last - 1) = '_' then
 239                         raise Picture_Error;
 240                      end if;
 241
 242                   elsif Picture (Last) = ')' then
 243                      exit;
 244
 245                   elsif Picture (Last) not in '0' .. '9' then
 246                      raise Picture_Error;
 247
 248                   else
 249                      Count := Count * 10
 250                                 +  Character'Pos (Picture (Last)) -
 251                                    Character'Pos ('0');
 252                   end if;
 253
 254                   Last := Last + 1;
 255                end loop;
 256
 257                --  In what follows note that one copy of the repeated
 258                --  character has already been made, so a count of one is
 259                --  no-op, and a count of zero erases a character.
 260
 261                for J in 2 .. Count loop
 262                   Result (Result_Index + J - 2) := Picture (Picture_Index - 1);
 263                end loop;
 264
 265                Result_Index := Result_Index + Count - 1;
 266
 267                --  Last was a ')' throw it away too
 268
 269                Picture_Index := Last + 1;
 270
 271             when ')' =>
 272                raise Picture_Error;
 273
 274             when others =>
 275                Result (Result_Index) := Picture (Picture_Index);
 276                Picture_Index := Picture_Index + 1;
 277                Result_Index := Result_Index + 1;
 278
 279          end case;
 280
 281          exit when Picture_Index > Picture'Last;
 282       end loop;
 283
 284       return Result (1 .. Result_Index - 1);
 285
 286    exception
 287       when others =>
 288          raise Picture_Error;
 289    end Expand;
 290
 291    -------------------
 292    -- Format_Number --
 293    -------------------
 294
 295    function Format_Number
 296      (Pic                 : Format_Record;
 297       Number              : String;
 298       Currency_Symbol     : Wide_String;
 299       Fill_Character      : Wide_Character;
 300       Separator_Character : Wide_Character;
 301       Radix_Point         : Wide_Character) return Wide_String
 302    is
 303       Attrs    : Number_Attributes := Parse_Number_String (Number);
 304       Position : Integer;
 305       Rounded  : String := Number;
 306
 307       Sign_Position : Integer := Pic.Sign_Position; --  may float.
 308
 309       Answer       : Wide_String (1 .. Pic.Picture.Length);
 310       Last         : Integer;
 311       Currency_Pos : Integer := Pic.Start_Currency;
 312
 313       Dollar : Boolean := False;
 314       --  Overridden immediately if necessary
 315
 316       Zero : Boolean := True;
 317       --  Set to False when a non-zero digit is output
 318
 319    begin
 320
 321       --  If the picture has fewer decimal places than the number, the image
 322       --  must be rounded according to the usual rules.
 323
 324       if Attrs.Has_Fraction then
 325          declare
 326             R : constant Integer :=
 327               (Attrs.End_Of_Fraction - Attrs.Start_Of_Fraction + 1)
 328                 - Pic.Max_Trailing_Digits;
 329             R_Pos : Integer;
 330
 331          begin
 332             if R > 0 then
 333                R_Pos := Rounded'Length - R;
 334
 335                if Rounded (R_Pos + 1) > '4' then
 336
 337                   if Rounded (R_Pos) = '.' then
 338                      R_Pos := R_Pos - 1;
 339                   end if;
 340
 341                   if Rounded (R_Pos) /= '9' then
 342                      Rounded (R_Pos) := Character'Succ (Rounded (R_Pos));
 343                   else
 344                      Rounded (R_Pos) := '0';
 345                      R_Pos := R_Pos - 1;
 346
 347                      while R_Pos > 1 loop
 348                         if Rounded (R_Pos) = '.' then
 349                            R_Pos := R_Pos - 1;
 350                         end if;
 351
 352                         if Rounded (R_Pos) /= '9' then
 353                            Rounded (R_Pos) := Character'Succ (Rounded (R_Pos));
 354                            exit;
 355                         else
 356                            Rounded (R_Pos) := '0';
 357                            R_Pos := R_Pos - 1;
 358                         end if;
 359                      end loop;
 360
 361                      --  The rounding may add a digit in front. Either the
 362                      --  leading blank or the sign (already captured) can be
 363                      --  overwritten.
 364
 365                      if R_Pos = 1 then
 366                         Rounded (R_Pos) := '1';
 367                         Attrs.Start_Of_Int := Attrs.Start_Of_Int - 1;
 368                      end if;
 369                   end if;
 370                end if;
 371             end if;
 372          end;
 373       end if;
 374
 375       for J in Answer'Range loop
 376          Answer (J) := To_Wide (Pic.Picture.Expanded (J));
 377       end loop;
 378
 379       if Pic.Start_Currency /= Invalid_Position then
 380          Dollar := Answer (Pic.Start_Currency) = '$';
 381       end if;
 382
 383       --  Fix up "direct inserts" outside the playing field. Set up as one
 384       --  loop to do the beginning, one (reverse) loop to do the end.
 385
 386       Last := 1;
 387       loop
 388          exit when Last = Pic.Start_Float;
 389          exit when Last = Pic.Radix_Position;
 390          exit when Answer (Last) = '9';
 391
 392          case Answer (Last) is
 393
 394             when '_' =>
 395                Answer (Last) := Separator_Character;
 396
 397             when 'b' =>
 398                Answer (Last) := ' ';
 399
 400             when others =>
 401                null;
 402
 403          end case;
 404
 405          exit when Last = Answer'Last;
 406
 407          Last := Last + 1;
 408       end loop;
 409
 410       --  Now for the end...
 411
 412       for J in reverse Last .. Answer'Last loop
 413          exit when J = Pic.Radix_Position;
 414
 415          --  Do this test First, Separator_Character can equal Pic.Floater
 416
 417          if Answer (J) = Pic.Floater then
 418             exit;
 419          end if;
 420
 421          case Answer (J) is
 422
 423             when '_' =>
 424                Answer (J) := Separator_Character;
 425
 426             when 'b' =>
 427                Answer (J) := ' ';
 428
 429             when '9' =>
 430                exit;
 431
 432             when others =>
 433                null;
 434
 435          end case;
 436       end loop;
 437
 438       --  Non-floating sign
 439
 440       if Pic.Start_Currency /= -1
 441         and then Answer (Pic.Start_Currency) = '#'
 442         and then Pic.Floater /= '#'
 443       then
 444          if Currency_Symbol'Length >
 445             Pic.End_Currency - Pic.Start_Currency + 1
 446          then
 447             raise Picture_Error;
 448
 449          elsif Currency_Symbol'Length =
 450             Pic.End_Currency - Pic.Start_Currency + 1
 451          then
 452             Answer (Pic.Start_Currency .. Pic.End_Currency) :=
 453               Currency_Symbol;
 454
 455          elsif Pic.Radix_Position = Invalid_Position
 456            or else Pic.Start_Currency < Pic.Radix_Position
 457          then
 458             Answer (Pic.Start_Currency .. Pic.End_Currency) :=
 459                                                         (others => ' ');
 460             Answer (Pic.End_Currency - Currency_Symbol'Length + 1 ..
 461                     Pic.End_Currency) := Currency_Symbol;
 462
 463          else
 464             Answer (Pic.Start_Currency .. Pic.End_Currency) :=
 465                                                         (others => ' ');
 466             Answer (Pic.Start_Currency ..
 467                     Pic.Start_Currency + Currency_Symbol'Length - 1) :=
 468                                                         Currency_Symbol;
 469          end if;
 470       end if;
 471
 472       --  Fill in leading digits
 473
 474       if Attrs.End_Of_Int - Attrs.Start_Of_Int + 1 >
 475                                                 Pic.Max_Leading_Digits
 476       then
 477          raise Layout_Error;
 478       end if;
 479
 480       if Pic.Radix_Position = Invalid_Position then
 481          Position := Answer'Last;
 482       else
 483          Position := Pic.Radix_Position - 1;
 484       end if;
 485
 486       for J in reverse Attrs.Start_Of_Int .. Attrs.End_Of_Int loop
 487
 488          while Answer (Position) /= '9'
 489            and Answer (Position) /= Pic.Floater
 490          loop
 491             if Answer (Position) = '_' then
 492                Answer (Position) := Separator_Character;
 493
 494             elsif Answer (Position) = 'b' then
 495                Answer (Position) := ' ';
 496             end if;
 497
 498             Position := Position - 1;
 499          end loop;
 500
 501          Answer (Position) := To_Wide (Rounded (J));
 502
 503          if Rounded (J) /= '0' then
 504             Zero := False;
 505          end if;
 506
 507          Position := Position - 1;
 508       end loop;
 509
 510       --  Do lead float
 511
 512       if Pic.Start_Float = Invalid_Position then
 513
 514          --  No leading floats, but need to change '9' to '0', '_' to
 515          --  Separator_Character and 'b' to ' '.
 516
 517          for J in Last .. Position loop
 518
 519             --  Last set when fixing the "uninteresting" leaders above.
 520             --  Don't duplicate the work.
 521
 522             if Answer (J) = '9' then
 523                Answer (J) := '0';
 524
 525             elsif Answer (J) = '_' then
 526                Answer (J) := Separator_Character;
 527
 528             elsif Answer (J) = 'b' then
 529                Answer (J) := ' ';
 530
 531             end if;
 532
 533          end loop;
 534
 535       elsif Pic.Floater = '<'
 536               or else
 537             Pic.Floater = '+'
 538               or else
 539             Pic.Floater = '-'
 540       then
 541          for J in Pic.End_Float .. Position loop --  May be null range
 542             if Answer (J) = '9' then
 543                Answer (J) := '0';
 544
 545             elsif Answer (J) = '_' then
 546                Answer (J) := Separator_Character;
 547
 548             elsif Answer (J) = 'b' then
 549                Answer (J) := ' ';
 550
 551             end if;
 552          end loop;
 553
 554          if Position > Pic.End_Float then
 555             Position := Pic.End_Float;
 556          end if;
 557
 558          for J in Pic.Start_Float .. Position - 1 loop
 559             Answer (J) := ' ';
 560          end loop;
 561
 562          Answer (Position) := Pic.Floater;
 563          Sign_Position     := Position;
 564
 565       elsif Pic.Floater = '$' then
 566
 567          for J in Pic.End_Float .. Position loop --  May be null range
 568             if Answer (J) = '9' then
 569                Answer (J) := '0';
 570
 571             elsif Answer (J) = '_' then
 572                Answer (J) := ' ';   --  no separator before leftmost digit
 573
 574             elsif Answer (J) = 'b' then
 575                Answer (J) := ' ';
 576             end if;
 577          end loop;
 578
 579          if Position > Pic.End_Float then
 580             Position := Pic.End_Float;
 581          end if;
 582
 583          for J in Pic.Start_Float .. Position - 1 loop
 584             Answer (J) := ' ';
 585          end loop;
 586
 587          Answer (Position) := Pic.Floater;
 588          Currency_Pos      := Position;
 589
 590       elsif Pic.Floater = '*' then
 591
 592          for J in Pic.End_Float .. Position loop --  May be null range
 593             if Answer (J) = '9' then
 594                Answer (J) := '0';
 595
 596             elsif Answer (J) = '_' then
 597                Answer (J) := Separator_Character;
 598
 599             elsif Answer (J) = 'b' then
 600                Answer (J) := '*';
 601             end if;
 602          end loop;
 603
 604          if Position > Pic.End_Float then
 605             Position := Pic.End_Float;
 606          end if;
 607
 608          for J in Pic.Start_Float .. Position loop
 609             Answer (J) := '*';
 610          end loop;
 611
 612       else
 613          if Pic.Floater = '#' then
 614             Currency_Pos := Currency_Symbol'Length;
 615          end if;
 616
 617          for J in reverse Pic.Start_Float .. Position loop
 618             case Answer (J) is
 619
 620                when '*' =>
 621                   Answer (J) := Fill_Character;
 622
 623                when 'Z' | 'b' | '/' | '0' =>
 624                   Answer (J) := ' ';
 625
 626                when '9' =>
 627                   Answer (J) := '0';
 628
 629                when '.' | 'V' | 'v' | '<' | '$' | '+' | '-' =>
 630                   null;
 631
 632                when '#' =>
 633                   if Currency_Pos = 0 then
 634                      Answer (J) := ' ';
 635                   else
 636                      Answer (J)   := Currency_Symbol (Currency_Pos);
 637                      Currency_Pos := Currency_Pos - 1;
 638                   end if;
 639
 640                when '_' =>
 641
 642                   case Pic.Floater is
 643
 644                      when '*' =>
 645                         Answer (J) := Fill_Character;
 646
 647                      when 'Z' | 'b' =>
 648                         Answer (J) := ' ';
 649
 650                      when '#' =>
 651                         if Currency_Pos = 0 then
 652                            Answer (J) := ' ';
 653
 654                         else
 655                            Answer (J)   := Currency_Symbol (Currency_Pos);
 656                            Currency_Pos := Currency_Pos - 1;
 657                         end if;
 658
 659                      when others =>
 660                         null;
 661
 662                   end case;
 663
 664                when others =>
 665                   null;
 666
 667             end case;
 668          end loop;
 669
 670          if Pic.Floater = '#' and then Currency_Pos /= 0 then
 671             raise Layout_Error;
 672          end if;
 673       end if;
 674
 675       --  Do sign
 676
 677       if Sign_Position = Invalid_Position then
 678          if Attrs.Negative then
 679             raise Layout_Error;
 680          end if;
 681
 682       else
 683          if Attrs.Negative then
 684             case Answer (Sign_Position) is
 685                when 'C' | 'D' | '-' =>
 686                   null;
 687
 688                when '+' =>
 689                   Answer (Sign_Position) := '-';
 690
 691                when '<' =>
 692                   Answer (Sign_Position)   := '(';
 693                   Answer (Pic.Second_Sign) := ')';
 694
 695                when others =>
 696                   raise Picture_Error;
 697
 698             end case;
 699
 700          else --  positive
 701
 702             case Answer (Sign_Position) is
 703
 704                when '-' =>
 705                   Answer (Sign_Position) := ' ';
 706
 707                when '<' | 'C' | 'D' =>
 708                   Answer (Sign_Position)   := ' ';
 709                   Answer (Pic.Second_Sign) := ' ';
 710
 711                when '+' =>
 712                   null;
 713
 714                when others =>
 715                   raise Picture_Error;
 716
 717             end case;
 718          end if;
 719       end if;
 720
 721       --  Fill in trailing digits
 722
 723       if Pic.Max_Trailing_Digits > 0 then
 724
 725          if Attrs.Has_Fraction then
 726             Position := Attrs.Start_Of_Fraction;
 727             Last     := Pic.Radix_Position + 1;
 728
 729             for J in Last .. Answer'Last loop
 730
 731                if Answer (J) = '9' or Answer (J) = Pic.Floater then
 732                   Answer (J) := To_Wide (Rounded (Position));
 733
 734                   if Rounded (Position) /= '0' then
 735                      Zero := False;
 736                   end if;
 737
 738                   Position := Position + 1;
 739                   Last     := J + 1;
 740
 741                   --  Used up fraction but remember place in Answer
 742
 743                   exit when Position > Attrs.End_Of_Fraction;
 744
 745                elsif Answer (J) = 'b' then
 746                   Answer (J) := ' ';
 747
 748                elsif Answer (J) = '_' then
 749                   Answer (J) := Separator_Character;
 750
 751                end if;
 752
 753                Last := J + 1;
 754             end loop;
 755
 756             Position := Last;
 757
 758          else
 759             Position := Pic.Radix_Position + 1;
 760          end if;
 761
 762          --  Now fill remaining 9's with zeros and _ with separators
 763
 764          Last := Answer'Last;
 765
 766          for J in Position .. Last loop
 767             if Answer (J) = '9' then
 768                Answer (J) := '0';
 769
 770             elsif Answer (J) = Pic.Floater then
 771                Answer (J) := '0';
 772
 773             elsif Answer (J) = '_' then
 774                Answer (J) := Separator_Character;
 775
 776             elsif Answer (J) = 'b' then
 777                Answer (J) := ' ';
 778
 779             end if;
 780          end loop;
 781
 782          Position := Last + 1;
 783
 784       else
 785          if Pic.Floater = '#' and then Currency_Pos /= 0 then
 786             raise Layout_Error;
 787          end if;
 788
 789          --  No trailing digits, but now J may need to stick in a currency
 790          --  symbol or sign.
 791
 792          if Pic.Start_Currency = Invalid_Position then
 793             Position := Answer'Last + 1;
 794          else
 795             Position := Pic.Start_Currency;
 796          end if;
 797       end if;
 798
 799       for J in Position .. Answer'Last loop
 800
 801          if Pic.Start_Currency /= Invalid_Position and then
 802             Answer (Pic.Start_Currency) = '#' then
 803             Currency_Pos := 1;
 804          end if;
 805
 806          --  Note: There are some weird cases J can imagine with 'b' or '#'
 807          --  in currency strings where the following code will cause
 808          --  glitches. The trick is to tell when the character in the
 809          --  answer should be checked, and when to look at the original
 810          --  string. Some other time. RIE 11/26/96 ???
 811
 812          case Answer (J) is
 813             when '*' =>
 814                Answer (J) := Fill_Character;
 815
 816             when 'b' =>
 817                Answer (J) := ' ';
 818
 819             when '#' =>
 820                if Currency_Pos > Currency_Symbol'Length then
 821                   Answer (J) := ' ';
 822
 823                else
 824                   Answer (J)   := Currency_Symbol (Currency_Pos);
 825                   Currency_Pos := Currency_Pos + 1;
 826                end if;
 827
 828             when '_' =>
 829
 830                case Pic.Floater is
 831
 832                   when '*' =>
 833                      Answer (J) := Fill_Character;
 834
 835                   when 'Z' | 'z' =>
 836                      Answer (J) := ' ';
 837
 838                   when '#' =>
 839                      if Currency_Pos > Currency_Symbol'Length then
 840                         Answer (J) := ' ';
 841                      else
 842                         Answer (J)   := Currency_Symbol (Currency_Pos);
 843                         Currency_Pos := Currency_Pos + 1;
 844                      end if;
 845
 846                   when others =>
 847                      null;
 848
 849                end case;
 850
 851             when others =>
 852                exit;
 853
 854          end case;
 855       end loop;
 856
 857       --  Now get rid of Blank_when_Zero and complete Star fill
 858
 859       if Zero and Pic.Blank_When_Zero then
 860
 861          --  Value is zero, and blank it
 862
 863          Last := Answer'Last;
 864
 865          if Dollar then
 866             Last := Last - 1 + Currency_Symbol'Length;
 867          end if;
 868
 869          if Pic.Radix_Position /= Invalid_Position and then
 870             Answer (Pic.Radix_Position) = 'V' then
 871             Last := Last - 1;
 872          end if;
 873
 874          return Wide_String'(1 .. Last => ' ');
 875
 876       elsif Zero and Pic.Star_Fill then
 877          Last := Answer'Last;
 878
 879          if Dollar then
 880             Last := Last - 1 + Currency_Symbol'Length;
 881          end if;
 882
 883          if Pic.Radix_Position /= Invalid_Position then
 884
 885             if Answer (Pic.Radix_Position) = 'V' then
 886                Last := Last - 1;
 887
 888             elsif Dollar then
 889                if Pic.Radix_Position > Pic.Start_Currency then
 890                   return Wide_String'(1 .. Pic.Radix_Position - 1 => '*') &
 891                      Radix_Point &
 892                      Wide_String'(Pic.Radix_Position + 1 .. Last => '*');
 893
 894                else
 895                   return
 896                      Wide_String'
 897                      (1 ..
 898                       Pic.Radix_Position + Currency_Symbol'Length - 2
 899                                              => '*') &
 900                      Radix_Point &
 901                      Wide_String'
 902                        (Pic.Radix_Position + Currency_Symbol'Length .. Last
 903                                              => '*');
 904                end if;
 905
 906             else
 907                return
 908                  Wide_String'(1 .. Pic.Radix_Position - 1 => '*') &
 909                  Radix_Point &
 910                  Wide_String'(Pic.Radix_Position + 1 .. Last => '*');
 911             end if;
 912          end if;
 913
 914          return Wide_String'(1 .. Last => '*');
 915       end if;
 916
 917       --  This was once a simple return statement, now there are nine
 918       --  different return cases.  Not to mention the five above to deal
 919       --  with zeros.  Why not split things out?
 920
 921       --  Processing the radix and sign expansion separately
 922       --  would require lots of copying--the string and some of its
 923       --  indicies--without really simplifying the logic.  The cases are:
 924
 925       --  1) Expand $, replace '.' with Radix_Point
 926       --  2) No currency expansion, replace '.' with Radix_Point
 927       --  3) Expand $, radix blanked
 928       --  4) No currency expansion, radix blanked
 929       --  5) Elide V
 930       --  6) Expand $, Elide V
 931       --  7) Elide V, Expand $ (Two cases depending on order.)
 932       --  8) No radix, expand $
 933       --  9) No radix, no currency expansion
 934
 935       if Pic.Radix_Position /= Invalid_Position then
 936
 937          if Answer (Pic.Radix_Position) = '.' then
 938             Answer (Pic.Radix_Position) := Radix_Point;
 939
 940             if Dollar then
 941
 942                --  1) Expand $, replace '.' with Radix_Point
 943
 944                return Answer (1 .. Currency_Pos - 1) & Currency_Symbol &
 945                   Answer (Currency_Pos + 1 .. Answer'Last);
 946
 947             else
 948                --  2) No currency expansion, replace '.' with Radix_Point
 949
 950                return Answer;
 951             end if;
 952
 953          elsif Answer (Pic.Radix_Position) = ' ' then --  blanked radix.
 954             if Dollar then
 955
 956                --  3) Expand $, radix blanked
 957
 958                return Answer (1 .. Currency_Pos - 1) & Currency_Symbol &
 959                  Answer (Currency_Pos + 1 .. Answer'Last);
 960
 961             else
 962                --  4) No expansion, radix blanked
 963
 964                return Answer;
 965             end if;
 966
 967          --  V cases
 968
 969          else
 970             if not Dollar then
 971
 972                --  5) Elide V
 973
 974                return Answer (1 .. Pic.Radix_Position - 1) &
 975                   Answer (Pic.Radix_Position + 1 .. Answer'Last);
 976
 977             elsif Currency_Pos < Pic.Radix_Position then
 978
 979                --  6) Expand $, Elide V
 980
 981                return Answer (1 .. Currency_Pos - 1) & Currency_Symbol &
 982                   Answer (Currency_Pos + 1 .. Pic.Radix_Position - 1) &
 983                   Answer (Pic.Radix_Position + 1 .. Answer'Last);
 984
 985             else
 986                --  7) Elide V, Expand $
 987
 988                return Answer (1 .. Pic.Radix_Position - 1) &
 989                   Answer (Pic.Radix_Position + 1 .. Currency_Pos - 1) &
 990                   Currency_Symbol &
 991                   Answer (Currency_Pos + 1 .. Answer'Last);
 992             end if;
 993          end if;
 994
 995       elsif Dollar then
 996
 997          --  8) No radix, expand $
 998
 999          return Answer (1 .. Currency_Pos - 1) & Currency_Symbol &
1000             Answer (Currency_Pos + 1 .. Answer'Last);
1001
1002       else
1003          --  9) No radix, no currency expansion
1004
1005          return Answer;
1006       end if;
1007    end Format_Number;
1008
1009    -------------------------
1010    -- Parse_Number_String --
1011    -------------------------
1012
1013    function Parse_Number_String (Str : String) return Number_Attributes is
1014       Answer : Number_Attributes;
1015
1016    begin
1017       for J in Str'Range loop
1018          case Str (J) is
1019
1020             when ' ' =>
1021                null; --  ignore
1022
1023             when '1' .. '9' =>
1024
1025                --  Decide if this is the start of a number.
1026                --  If so, figure out which one...
1027
1028                if Answer.Has_Fraction then
1029                   Answer.End_Of_Fraction := J;
1030                else
1031                   if Answer.Start_Of_Int = Invalid_Position then
1032                      --  start integer
1033                      Answer.Start_Of_Int := J;
1034                   end if;
1035                   Answer.End_Of_Int := J;
1036                end if;
1037
1038             when '0' =>
1039
1040                --  Only count a zero before the decimal point if it follows a
1041                --  non-zero digit.  After the decimal point, zeros will be
1042                --  counted if followed by a non-zero digit.
1043
1044                if not Answer.Has_Fraction then
1045                   if Answer.Start_Of_Int /= Invalid_Position then
1046                      Answer.End_Of_Int := J;
1047                   end if;
1048                end if;
1049
1050             when '-' =>
1051
1052                --  Set negative
1053
1054                Answer.Negative := True;
1055
1056             when '.' =>
1057
1058                --  Close integer, start fraction
1059
1060                if Answer.Has_Fraction then
1061                   raise Picture_Error;
1062                end if;
1063
1064                --  Two decimal points is a no-no
1065
1066                Answer.Has_Fraction    := True;
1067                Answer.End_Of_Fraction := J;
1068
1069                --  Could leave this at Invalid_Position, but this seems the
1070                --  right way to indicate a null range...
1071
1072                Answer.Start_Of_Fraction := J + 1;
1073                Answer.End_Of_Int        := J - 1;
1074
1075             when others =>
1076                raise Picture_Error; -- can this happen? probably not!
1077          end case;
1078       end loop;
1079
1080       if Answer.Start_Of_Int = Invalid_Position then
1081          Answer.Start_Of_Int := Answer.End_Of_Int + 1;
1082       end if;
1083
1084       --  No significant (intger) digits needs a null range
1085
1086       return Answer;
1087    end Parse_Number_String;
1088
1089    ----------------
1090    -- Pic_String --
1091    ----------------
1092
1093    --  The following ensures that we return B and not b being careful not
1094    --  to break things which expect lower case b for blank. See CXF3A02.
1095
1096    function Pic_String (Pic : Picture) return String is
1097       Temp : String (1 .. Pic.Contents.Picture.Length) :=
1098                               Pic.Contents.Picture.Expanded;
1099    begin
1100       for J in Temp'Range loop
1101          if Temp (J) = 'b' then
1102             Temp (J) := 'B';
1103          end if;
1104       end loop;
1105
1106       return Temp;
1107    end Pic_String;
1108
1109    ------------------
1110    -- Precalculate --
1111    ------------------
1112
1113    procedure Precalculate  (Pic : in out Format_Record) is
1114
1115       Computed_BWZ : Boolean := True;
1116
1117       type Legality is  (Okay, Reject);
1118       State : Legality := Reject;
1119       --  Start in reject, which will reject null strings
1120
1121       Index : Pic_Index := Pic.Picture.Expanded'First;
1122
1123       function At_End return Boolean;
1124       pragma Inline (At_End);
1125
1126       procedure Set_State (L : Legality);
1127       pragma Inline (Set_State);
1128
1129       function Look return Character;
1130       pragma Inline (Look);
1131
1132       function Is_Insert return Boolean;
1133       pragma Inline (Is_Insert);
1134
1135       procedure Skip;
1136       pragma Inline (Skip);
1137
1138       procedure Trailing_Currency;
1139       procedure Trailing_Bracket;
1140       procedure Number_Fraction;
1141       procedure Number_Completion;
1142       procedure Number_Fraction_Or_Bracket;
1143       procedure Number_Fraction_Or_Z_Fill;
1144       procedure Zero_Suppression;
1145       procedure Floating_Bracket;
1146       procedure Number_Fraction_Or_Star_Fill;
1147       procedure Star_Suppression;
1148       procedure Number_Fraction_Or_Dollar;
1149       procedure Leading_Dollar;
1150       procedure Number_Fraction_Or_Pound;
1151       procedure Leading_Pound;
1152       procedure Picture;
1153       procedure Floating_Plus;
1154       procedure Floating_Minus;
1155       procedure Picture_Plus;
1156       procedure Picture_Minus;
1157       procedure Picture_Bracket;
1158       procedure Number;
1159       procedure Optional_RHS_Sign;
1160       procedure Picture_String;
1161
1162       ------------
1163       -- At_End --
1164       ------------
1165
1166       function At_End return Boolean is
1167       begin
1168          return Index > Pic.Picture.Length;
1169       end At_End;
1170
1171       ----------------------
1172       -- Floating_Bracket --
1173       ----------------------
1174
1175       --  Note that Floating_Bracket is only called with an acceptable
1176       --  prefix. But we don't set Okay, because we must end with a '>'.
1177
1178       procedure Floating_Bracket is
1179       begin
1180          Pic.Floater := '<';
1181          Pic.End_Float := Index;
1182          Pic.Max_Leading_Digits := Pic.Max_Leading_Digits + 1;
1183
1184          --  First bracket wasn't counted...
1185
1186          Skip; --  known '<'
1187
1188          loop
1189             if At_End then
1190                return;
1191             end if;
1192
1193             case Look is
1194
1195                when '_' | '0' | '/' =>
1196                   Pic.End_Float := Index;
1197                   Skip;
1198
1199                when 'B' | 'b'  =>
1200                   Pic.End_Float := Index;
1201                   Pic.Picture.Expanded (Index) := 'b';
1202                   Skip;
1203
1204                when '<' =>
1205                   Pic.End_Float := Index;
1206                   Pic.Max_Leading_Digits := Pic.Max_Leading_Digits + 1;
1207                   Skip;
1208
1209                when '9' =>
1210                   Number_Completion;
1211
1212                when '$' =>
1213                   Leading_Dollar;
1214
1215                when '#' =>
1216                   Leading_Pound;
1217
1218                when 'V' | 'v' | '.' =>
1219                   Pic.Radix_Position := Index;
1220                   Skip;
1221                   Number_Fraction_Or_Bracket;
1222                   return;
1223
1224                when others =>
1225                return;
1226             end case;
1227          end loop;
1228       end Floating_Bracket;
1229
1230       --------------------
1231       -- Floating_Minus --
1232       --------------------
1233
1234       procedure Floating_Minus is
1235       begin
1236          loop
1237             if At_End then
1238                return;
1239             end if;
1240
1241             case Look is
1242                when '_' | '0' | '/' =>
1243                   Pic.End_Float := Index;
1244                   Skip;
1245
1246                when 'B' | 'b'  =>
1247                   Pic.End_Float := Index;
1248                   Pic.Picture.Expanded (Index) := 'b';
1249                   Skip;
1250
1251                when '-' =>
1252                   Pic.Max_Leading_Digits := Pic.Max_Leading_Digits + 1;
1253                   Pic.End_Float := Index;
1254                   Skip;
1255
1256                when '9' =>
1257                   Number_Completion;
1258                   return;
1259
1260                when '.' | 'V' | 'v' =>
1261                   Pic.Radix_Position := Index;
1262                   Skip; --  Radix
1263
1264                   while Is_Insert loop
1265                      Skip;
1266                   end loop;
1267
1268                   if At_End then
1269                      return;
1270                   end if;
1271
1272                   if Look = '-' then
1273                      loop
1274                         if At_End then
1275                            return;
1276                         end if;
1277
1278                         case Look is
1279
1280                            when '-' =>
1281                               Pic.Max_Trailing_Digits :=
1282                                 Pic.Max_Trailing_Digits + 1;
1283                               Pic.End_Float := Index;
1284                               Skip;
1285
1286                            when '_' | '0' | '/' =>
1287                               Skip;
1288
1289                            when 'B' | 'b'  =>
1290                               Pic.Picture.Expanded (Index) := 'b';
1291                               Skip;
1292
1293                            when others =>
1294                               return;
1295
1296                         end case;
1297                      end loop;
1298
1299                   else
1300                      Number_Completion;
1301                   end if;
1302
1303                   return;
1304
1305                when others =>
1306                   return;
1307             end case;
1308          end loop;
1309       end Floating_Minus;
1310
1311       -------------------
1312       -- Floating_Plus --
1313       -------------------
1314
1315       procedure Floating_Plus is
1316       begin
1317          loop
1318             if At_End then
1319                return;
1320             end if;
1321
1322             case Look is
1323                when '_' | '0' | '/' =>
1324                   Pic.End_Float := Index;
1325                   Skip;
1326
1327                when 'B' | 'b'  =>
1328                   Pic.End_Float := Index;
1329                   Pic.Picture.Expanded (Index) := 'b';
1330                   Skip;
1331
1332                when '+' =>
1333                   Pic.Max_Leading_Digits := Pic.Max_Leading_Digits + 1;
1334                   Pic.End_Float := Index;
1335                   Skip;
1336
1337                when '9' =>
1338                   Number_Completion;
1339                   return;
1340
1341                when '.' | 'V' | 'v' =>
1342                   Pic.Radix_Position := Index;
1343                   Skip; --  Radix
1344
1345                   while Is_Insert loop
1346                      Skip;
1347                   end loop;
1348
1349                   if At_End then
1350                      return;
1351                   end if;
1352
1353                   if Look = '+' then
1354                      loop
1355                         if At_End then
1356                            return;
1357                         end if;
1358
1359                         case Look is
1360
1361                            when '+' =>
1362                               Pic.Max_Trailing_Digits :=
1363                                 Pic.Max_Trailing_Digits + 1;
1364                               Pic.End_Float := Index;
1365                               Skip;
1366
1367                            when '_' | '0' | '/' =>
1368                               Skip;
1369
1370                            when 'B' | 'b'  =>
1371                               Pic.Picture.Expanded (Index) := 'b';
1372                               Skip;
1373
1374                            when others =>
1375                               return;
1376
1377                         end case;
1378                      end loop;
1379
1380                   else
1381                      Number_Completion;
1382                   end if;
1383
1384                   return;
1385
1386                when others =>
1387                   return;
1388
1389             end case;
1390          end loop;
1391       end Floating_Plus;
1392
1393       ---------------
1394       -- Is_Insert --
1395       ---------------
1396
1397       function Is_Insert return Boolean is
1398       begin
1399          if At_End then
1400             return False;
1401          end if;
1402
1403          case Pic.Picture.Expanded (Index) is
1404
1405             when '_' | '0' | '/' => return True;
1406
1407             when 'B' | 'b' =>
1408                Pic.Picture.Expanded (Index) := 'b'; --  canonical
1409                return True;
1410
1411             when others => return False;
1412          end case;
1413       end Is_Insert;
1414
1415       --------------------
1416       -- Leading_Dollar --
1417       --------------------
1418
1419       --  Note that Leading_Dollar can be called in either State.
1420       --  It will set state to Okay only if a 9 or (second) $
1421       --  is encountered.
1422
1423       --  Also notice the tricky bit with State and Zero_Suppression.
1424       --  Zero_Suppression is Picture_Error if a '$' or a '9' has been
1425       --  encountered, exactly the cases where State has been set.
1426
1427       procedure Leading_Dollar is
1428       begin
1429          --  Treat as a floating dollar, and unwind otherwise
1430
1431          Pic.Floater := '$';
1432          Pic.Start_Currency := Index;
1433          Pic.End_Currency := Index;
1434          Pic.Start_Float := Index;
1435          Pic.End_Float := Index;
1436
1437          --  Don't increment Pic.Max_Leading_Digits, we need one "real"
1438          --  currency place.
1439
1440          Skip; --  known '$'
1441
1442          loop
1443             if At_End then
1444                return;
1445             end if;
1446
1447             case Look is
1448
1449                when '_' | '0' | '/' =>
1450                   Pic.End_Float := Index;
1451                   Skip;
1452
1453                   --  A trailing insertion character is not part of the
1454                   --  floating currency, so need to look ahead.
1455
1456                   if Look /= '$' then
1457                      Pic.End_Float := Pic.End_Float - 1;
1458                   end if;
1459
1460                when 'B' | 'b'  =>
1461                   Pic.End_Float := Index;
1462                   Pic.Picture.Expanded (Index) := 'b';
1463                   Skip;
1464
1465                when 'Z' | 'z' =>
1466                   Pic.Picture.Expanded (Index) := 'Z'; -- consistency
1467
1468                   if State = Okay then
1469                      raise Picture_Error;
1470                   else
1471                      --  Will overwrite Floater and Start_Float
1472
1473                      Zero_Suppression;
1474                   end if;
1475
1476                when '*' =>
1477                   if State = Okay then
1478                      raise Picture_Error;
1479                   else
1480                      --  Will overwrite Floater and Start_Float
1481
1482                      Star_Suppression;
1483                   end if;
1484
1485                when '$' =>
1486                   Pic.Max_Leading_Digits := Pic.Max_Leading_Digits + 1;
1487                   Pic.End_Float := Index;
1488                   Pic.End_Currency := Index;
1489                   Set_State (Okay); Skip;
1490
1491                when '9' =>
1492                   if State /= Okay then
1493                      Pic.Floater := '!';
1494                      Pic.Start_Float := Invalid_Position;
1495                      Pic.End_Float := Invalid_Position;
1496                   end if;
1497
1498                   --  A single dollar does not a floating make
1499
1500                   Number_Completion;
1501                   return;
1502
1503                when 'V' | 'v' | '.' =>
1504                   if State /= Okay then
1505                      Pic.Floater := '!';
1506                      Pic.Start_Float := Invalid_Position;
1507                      Pic.End_Float := Invalid_Position;
1508                   end if;
1509
1510                   --  Only one dollar before the sign is okay, but doesn't
1511                   --  float.
1512
1513                   Pic.Radix_Position := Index;
1514                   Skip;
1515                   Number_Fraction_Or_Dollar;
1516                   return;
1517
1518                when others =>
1519                   return;
1520
1521             end case;
1522          end loop;
1523       end Leading_Dollar;
1524
1525       -------------------
1526       -- Leading_Pound --
1527       -------------------
1528
1529       --  This one is complex!  A Leading_Pound can be fixed or floating,
1530       --  but in some cases the decision has to be deferred until we leave
1531       --  this procedure.  Also note that Leading_Pound can be called in
1532       --  either State.
1533
1534       --  It will set state to Okay only if a 9 or  (second) # is
1535       --  encountered.
1536
1537       --  One Last note:  In ambiguous cases, the currency is treated as
1538       --  floating unless there is only one '#'.
1539
1540       procedure Leading_Pound is
1541
1542          Inserts : Boolean := False;
1543          --  Set to True if a '_', '0', '/', 'B', or 'b' is encountered
1544
1545          Must_Float : Boolean := False;
1546          --  Set to true if a '#' occurs after an insert
1547
1548       begin
1549          --  Treat as a floating currency. If it isn't, this will be
1550          --  overwritten later.
1551
1552          Pic.Floater := '#';
1553
1554          Pic.Start_Currency := Index;
1555          Pic.End_Currency := Index;
1556          Pic.Start_Float := Index;
1557          Pic.End_Float := Index;
1558
1559          --  Don't increment Pic.Max_Leading_Digits, we need one "real"
1560          --  currency place.
1561
1562          Pic.Max_Currency_Digits := 1; --  we've seen one.
1563
1564          Skip; --  known '#'
1565
1566          loop
1567             if At_End then
1568                return;
1569             end if;
1570
1571             case Look is
1572
1573                when '_' | '0' | '/' =>
1574                   Pic.End_Float := Index;
1575                   Inserts := True;
1576                   Skip;
1577
1578                when 'B' | 'b'  =>
1579                   Pic.Picture.Expanded (Index) := 'b';
1580                   Pic.End_Float := Index;
1581                   Inserts := True;
1582                   Skip;
1583
1584                when 'Z' | 'z' =>
1585                   Pic.Picture.Expanded (Index) := 'Z'; -- consistency
1586
1587                   if Must_Float then
1588                      raise Picture_Error;
1589                   else
1590                      Pic.Max_Leading_Digits := 0;
1591
1592                      --  Will overwrite Floater and Start_Float
1593
1594                      Zero_Suppression;
1595                   end if;
1596
1597                when '*' =>
1598                   if Must_Float then
1599                      raise Picture_Error;
1600                   else
1601                      Pic.Max_Leading_Digits := 0;
1602
1603                      --  Will overwrite Floater and Start_Float
1604
1605                      Star_Suppression;
1606                   end if;
1607
1608                when '#' =>
1609                   if Inserts then
1610                      Must_Float := True;
1611                   end if;
1612
1613                   Pic.Max_Leading_Digits := Pic.Max_Leading_Digits + 1;
1614                   Pic.End_Float := Index;
1615                   Pic.End_Currency := Index;
1616                   Set_State (Okay);
1617                   Skip;
1618
1619                when '9' =>
1620                   if State /= Okay then
1621
1622                      --  A single '#' doesn't float
1623
1624                      Pic.Floater := '!';
1625                      Pic.Start_Float := Invalid_Position;
1626                      Pic.End_Float := Invalid_Position;
1627                   end if;
1628
1629                   Number_Completion;
1630                   return;
1631
1632                when 'V' | 'v' | '.' =>
1633                   if State /= Okay then
1634                      Pic.Floater := '!';
1635                      Pic.Start_Float := Invalid_Position;
1636                      Pic.End_Float := Invalid_Position;
1637                   end if;
1638
1639                   --  Only one pound before the sign is okay, but doesn't
1640                   --  float.
1641
1642                   Pic.Radix_Position := Index;
1643                   Skip;
1644                   Number_Fraction_Or_Pound;
1645                   return;
1646
1647                when others =>
1648                   return;
1649             end case;
1650          end loop;
1651       end Leading_Pound;
1652
1653       ----------
1654       -- Look --
1655       ----------
1656
1657       function Look return Character is
1658       begin
1659          if At_End then
1660             raise Picture_Error;
1661          end if;
1662
1663          return Pic.Picture.Expanded (Index);
1664       end Look;
1665
1666       ------------
1667       -- Number --
1668       ------------
1669
1670       procedure Number is
1671       begin
1672          loop
1673
1674             case Look is
1675                when '_' | '0' | '/' =>
1676                   Skip;
1677
1678                when 'B' | 'b'  =>
1679                   Pic.Picture.Expanded (Index) := 'b';
1680                   Skip;
1681
1682                when '9' =>
1683                   Computed_BWZ := False;
1684                   Pic.Max_Leading_Digits := Pic.Max_Leading_Digits + 1;
1685                   Set_State (Okay);
1686                   Skip;
1687
1688                when '.' | 'V' | 'v' =>
1689                   Pic.Radix_Position := Index;
1690                   Skip;
1691                   Number_Fraction;
1692                   return;
1693
1694                when others =>
1695                   return;
1696
1697             end case;
1698
1699             if At_End then
1700                return;
1701             end if;
1702
1703             --  Will return in Okay state if a '9' was seen
1704
1705          end loop;
1706       end Number;
1707
1708       -----------------------
1709       -- Number_Completion --
1710       -----------------------
1711
1712       procedure Number_Completion is
1713       begin
1714          while not At_End loop
1715             case Look is
1716
1717                when '_' | '0' | '/' =>
1718                   Skip;
1719
1720                when 'B' | 'b'  =>
1721                   Pic.Picture.Expanded (Index) := 'b';
1722                   Skip;
1723
1724                when '9' =>
1725                   Computed_BWZ := False;
1726                   Pic.Max_Leading_Digits := Pic.Max_Leading_Digits + 1;
1727                   Set_State (Okay);
1728                   Skip;
1729
1730                when 'V' | 'v' | '.' =>
1731                   Pic.Radix_Position := Index;
1732                   Skip;
1733                   Number_Fraction;
1734                   return;
1735
1736                when others =>
1737                   return;
1738             end case;
1739          end loop;
1740       end Number_Completion;
1741
1742       ---------------------
1743       -- Number_Fraction --
1744       ---------------------
1745
1746       procedure Number_Fraction is
1747       begin
1748          --  Note that number fraction can be called in either State.
1749          --  It will set state to Valid only if a 9 is encountered.
1750
1751          loop
1752             if At_End then
1753                return;
1754             end if;
1755
1756             case Look is
1757                when '_' | '0' | '/' =>
1758                   Skip;
1759
1760                when 'B' | 'b'  =>
1761                   Pic.Picture.Expanded (Index) := 'b';
1762                   Skip;
1763
1764                when '9' =>
1765                   Computed_BWZ := False;
1766                   Pic.Max_Trailing_Digits := Pic.Max_Trailing_Digits + 1;
1767                   Set_State (Okay); Skip;
1768
1769                when others =>
1770                   return;
1771             end case;
1772          end loop;
1773       end Number_Fraction;
1774
1775       --------------------------------
1776       -- Number_Fraction_Or_Bracket --
1777       --------------------------------
1778
1779       procedure Number_Fraction_Or_Bracket is
1780       begin
1781          loop
1782             if At_End then
1783                return;
1784             end if;
1785
1786             case Look is
1787
1788                when '_' | '0' | '/' => Skip;
1789
1790                when 'B' | 'b'  =>
1791                   Pic.Picture.Expanded (Index) := 'b';
1792                   Skip;
1793
1794                when '<' =>
1795                   Pic.Max_Trailing_Digits := Pic.Max_Trailing_Digits + 1;
1796                   Pic.End_Float := Index;
1797                   Skip;
1798
1799                   loop
1800                      if At_End then
1801                         return;
1802                      end if;
1803
1804                      case Look is
1805                         when '_' | '0' | '/' =>
1806                            Skip;
1807
1808                         when 'B' | 'b'  =>
1809                            Pic.Picture.Expanded (Index) := 'b';
1810                            Skip;
1811
1812                         when '<' =>
1813                            Pic.Max_Trailing_Digits :=
1814                              Pic.Max_Trailing_Digits + 1;
1815                            Pic.End_Float := Index;
1816                            Skip;
1817
1818                         when others =>
1819                            return;
1820                      end case;
1821                   end loop;
1822
1823                when others =>
1824                   Number_Fraction;
1825                   return;
1826             end case;
1827          end loop;
1828       end Number_Fraction_Or_Bracket;
1829
1830       -------------------------------
1831       -- Number_Fraction_Or_Dollar --
1832       -------------------------------
1833
1834       procedure Number_Fraction_Or_Dollar is
1835       begin
1836          loop
1837             if At_End then
1838                return;
1839             end if;
1840
1841             case Look is
1842                when '_' | '0' | '/' =>
1843                   Skip;
1844
1845                when 'B' | 'b'  =>
1846                   Pic.Picture.Expanded (Index) := 'b';
1847                   Skip;
1848
1849                when '$' =>
1850                   Pic.Max_Trailing_Digits := Pic.Max_Trailing_Digits + 1;
1851                   Pic.End_Float := Index;
1852                   Skip;
1853
1854                   loop
1855                      if At_End then
1856                         return;
1857                      end if;
1858
1859                      case Look is
1860                         when '_' | '0' | '/' =>
1861                            Skip;
1862
1863                         when 'B' | 'b'  =>
1864                            Pic.Picture.Expanded (Index) := 'b';
1865                            Skip;
1866
1867                         when '$' =>
1868                            Pic.Max_Trailing_Digits :=
1869                              Pic.Max_Trailing_Digits + 1;
1870                            Pic.End_Float := Index;
1871                            Skip;
1872
1873                         when others =>
1874                            return;
1875                      end case;
1876                   end loop;
1877
1878                when others =>
1879                   Number_Fraction;
1880                   return;
1881             end case;
1882          end loop;
1883       end Number_Fraction_Or_Dollar;
1884
1885       ------------------------------
1886       -- Number_Fraction_Or_Pound --
1887       ------------------------------
1888
1889       procedure Number_Fraction_Or_Pound is
1890       begin
1891          loop
1892             if At_End then
1893                return;
1894             end if;
1895
1896             case Look is
1897
1898                when '_' | '0' | '/' =>
1899                   Skip;
1900
1901                when 'B' | 'b'  =>
1902                   Pic.Picture.Expanded (Index) := 'b';
1903                   Skip;
1904
1905                when '#' =>
1906                   Pic.Max_Trailing_Digits := Pic.Max_Trailing_Digits + 1;
1907                   Pic.End_Float := Index;
1908                   Skip;
1909
1910                   loop
1911                      if At_End then
1912                         return;
1913                      end if;
1914
1915                      case Look is
1916
1917                         when '_' | '0' | '/' =>
1918                            Skip;
1919
1920                         when 'B' | 'b'  =>
1921                            Pic.Picture.Expanded (Index) := 'b';
1922                            Skip;
1923
1924                         when '#' =>
1925                            Pic.Max_Trailing_Digits :=
1926                              Pic.Max_Trailing_Digits + 1;
1927                            Pic.End_Float := Index;
1928                            Skip;
1929
1930                         when others =>
1931                            return;
1932
1933                      end case;
1934                   end loop;
1935
1936                when others =>
1937                   Number_Fraction;
1938                   return;
1939
1940             end case;
1941          end loop;
1942       end Number_Fraction_Or_Pound;
1943
1944       ----------------------------------
1945       -- Number_Fraction_Or_Star_Fill --
1946       ----------------------------------
1947
1948       procedure Number_Fraction_Or_Star_Fill is
1949       begin
1950          loop
1951             if At_End then
1952                return;
1953             end if;
1954
1955             case Look is
1956
1957                when '_' | '0' | '/' =>
1958                   Skip;
1959
1960                when 'B' | 'b'  =>
1961                   Pic.Picture.Expanded (Index) := 'b';
1962                   Skip;
1963
1964                when '*' =>
1965                   Pic.Star_Fill := True;
1966                   Pic.Max_Trailing_Digits := Pic.Max_Trailing_Digits + 1;
1967                   Pic.End_Float := Index;
1968                   Skip;
1969
1970                   loop
1971                      if At_End then
1972                         return;
1973                      end if;
1974
1975                      case Look is
1976
1977                         when '_' | '0' | '/' =>
1978                            Skip;
1979
1980                         when 'B' | 'b'  =>
1981                            Pic.Picture.Expanded (Index) := 'b';
1982                            Skip;
1983
1984                         when '*' =>
1985                            Pic.Star_Fill := True;
1986                            Pic.Max_Trailing_Digits :=
1987                              Pic.Max_Trailing_Digits + 1;
1988                            Pic.End_Float := Index;
1989                            Skip;
1990
1991                         when others =>
1992                            return;
1993                      end case;
1994                   end loop;
1995
1996                when others =>
1997                   Number_Fraction;
1998                   return;
1999
2000             end case;
2001          end loop;
2002       end Number_Fraction_Or_Star_Fill;
2003
2004       -------------------------------
2005       -- Number_Fraction_Or_Z_Fill --
2006       -------------------------------
2007
2008       procedure Number_Fraction_Or_Z_Fill is
2009       begin
2010          loop
2011             if At_End then
2012                return;
2013             end if;
2014
2015             case Look is
2016
2017                when '_' | '0' | '/' =>
2018                   Skip;
2019
2020                when 'B' | 'b'  =>
2021                   Pic.Picture.Expanded (Index) := 'b';
2022                   Skip;
2023
2024                when 'Z' | 'z' =>
2025                   Pic.Max_Trailing_Digits := Pic.Max_Trailing_Digits + 1;
2026                   Pic.End_Float := Index;
2027                   Pic.Picture.Expanded (Index) := 'Z'; -- consistency
2028
2029                   Skip;
2030
2031                   loop
2032                      if At_End then
2033                         return;
2034                      end if;
2035
2036                      case Look is
2037
2038                         when '_' | '0' | '/' =>
2039                            Skip;
2040
2041                         when 'B' | 'b'  =>
2042                            Pic.Picture.Expanded (Index) := 'b';
2043                            Skip;
2044
2045                         when 'Z' | 'z' =>
2046                            Pic.Picture.Expanded (Index) := 'Z'; -- consistency
2047
2048                            Pic.Max_Trailing_Digits :=
2049                              Pic.Max_Trailing_Digits + 1;
2050                            Pic.End_Float := Index;
2051                            Skip;
2052
2053                         when others =>
2054                            return;
2055                      end case;
2056                   end loop;
2057
2058                when others =>
2059                   Number_Fraction;
2060                   return;
2061             end case;
2062          end loop;
2063       end Number_Fraction_Or_Z_Fill;
2064
2065       -----------------------
2066       -- Optional_RHS_Sign --
2067       -----------------------
2068
2069       procedure Optional_RHS_Sign is
2070       begin
2071          if At_End then
2072             return;
2073          end if;
2074
2075          case Look is
2076
2077             when '+' | '-' =>
2078                Pic.Sign_Position := Index;
2079                Skip;
2080                return;
2081
2082             when 'C' | 'c' =>
2083                Pic.Sign_Position := Index;
2084                Pic.Picture.Expanded (Index) := 'C';
2085                Skip;
2086
2087                if Look = 'R' or Look = 'r' then
2088                   Pic.Second_Sign := Index;
2089                   Pic.Picture.Expanded (Index) := 'R';
2090                   Skip;
2091
2092                else
2093                   raise Picture_Error;
2094                end if;
2095
2096                return;
2097
2098             when 'D' | 'd' =>
2099                Pic.Sign_Position := Index;
2100                Pic.Picture.Expanded (Index) := 'D';
2101                Skip;
2102
2103                if Look = 'B' or Look = 'b' then
2104                   Pic.Second_Sign := Index;
2105                   Pic.Picture.Expanded (Index) := 'B';
2106                   Skip;
2107
2108                else
2109                   raise Picture_Error;
2110                end if;
2111
2112                return;
2113
2114             when '>' =>
2115                if Pic.Picture.Expanded (Pic.Sign_Position) = '<' then
2116                   Pic.Second_Sign := Index;
2117                   Skip;
2118
2119                else
2120                   raise Picture_Error;
2121                end if;
2122
2123             when others =>
2124                return;
2125
2126          end case;
2127       end Optional_RHS_Sign;
2128
2129       -------------
2130       -- Picture --
2131       -------------
2132
2133       --  Note that Picture can be called in either State
2134
2135       --  It will set state to Valid only if a 9 is encountered or floating
2136       --  currency is called.
2137
2138       procedure Picture is
2139       begin
2140          loop
2141             if At_End then
2142                return;
2143             end if;
2144
2145             case Look is
2146
2147                when '_' | '0' | '/' =>
2148                   Skip;
2149
2150                when 'B' | 'b'  =>
2151                   Pic.Picture.Expanded (Index) := 'b';
2152                   Skip;
2153
2154                when '$' =>
2155                   Leading_Dollar;
2156                   return;
2157
2158                when '#' =>
2159                   Leading_Pound;
2160                   return;
2161
2162                when '9' =>
2163                   Computed_BWZ := False;
2164                   Set_State (Okay);
2165                   Pic.Max_Leading_Digits := Pic.Max_Leading_Digits + 1;
2166                   Skip;
2167
2168                when 'V' | 'v' | '.' =>
2169                   Pic.Radix_Position := Index;
2170                   Skip;
2171                   Number_Fraction;
2172                   Trailing_Currency;
2173                   return;
2174
2175                when others =>
2176                   return;
2177
2178             end case;
2179          end loop;
2180       end Picture;
2181
2182       ---------------------
2183       -- Picture_Bracket --
2184       ---------------------
2185
2186       procedure Picture_Bracket is
2187       begin
2188          Pic.Sign_Position := Index;
2189          Pic.Sign_Position := Index;
2190
2191          --  Treat as a floating sign, and unwind otherwise
2192
2193          Pic.Floater := '<';
2194          Pic.Start_Float := Index;
2195          Pic.End_Float := Index;
2196
2197          --  Don't increment Pic.Max_Leading_Digits, we need one "real"
2198          --  sign place.
2199
2200          Skip; --  Known Bracket
2201
2202          loop
2203             case Look is
2204
2205                when '_' | '0' | '/' =>
2206                   Pic.End_Float := Index;
2207                   Skip;
2208
2209                when 'B' | 'b'  =>
2210                   Pic.End_Float := Index;
2211                   Pic.Picture.Expanded (Index) := 'b';
2212                   Skip;
2213
2214                when '<' =>
2215                   Set_State (Okay);  --  "<<>" is enough.
2216                   Floating_Bracket;
2217                   Trailing_Currency;
2218                   Trailing_Bracket;
2219                   return;
2220
2221                when '$' | '#' | '9' | '*' =>
2222                   if State /= Okay then
2223                      Pic.Floater := '!';
2224                      Pic.Start_Float := Invalid_Position;
2225                      Pic.End_Float := Invalid_Position;
2226                   end if;
2227
2228                   Picture;
2229                   Trailing_Bracket;
2230                   Set_State (Okay);
2231                   return;
2232
2233                when '.' | 'V' | 'v' =>
2234                   if State /= Okay then
2235                      Pic.Floater := '!';
2236                      Pic.Start_Float := Invalid_Position;
2237                      Pic.End_Float := Invalid_Position;
2238                   end if;
2239
2240                   --  Don't assume that state is okay, haven't seen a digit
2241
2242                   Picture;
2243                   Trailing_Bracket;
2244                   return;
2245
2246                when others =>
2247                   raise Picture_Error;
2248
2249             end case;
2250          end loop;
2251       end Picture_Bracket;
2252
2253       -------------------
2254       -- Picture_Minus --
2255       -------------------
2256
2257       procedure Picture_Minus is
2258       begin
2259          Pic.Sign_Position := Index;
2260
2261          --  Treat as a floating sign, and unwind otherwise
2262
2263          Pic.Floater := '-';
2264          Pic.Start_Float := Index;
2265          Pic.End_Float := Index;
2266
2267          --  Don't increment Pic.Max_Leading_Digits, we need one "real"
2268          --  sign place.
2269
2270          Skip; --  Known Minus
2271
2272          loop
2273             case Look is
2274
2275                when '_' | '0' | '/' =>
2276                   Pic.End_Float := Index;
2277                   Skip;
2278
2279                when 'B' | 'b'  =>
2280                   Pic.End_Float := Index;
2281                   Pic.Picture.Expanded (Index) := 'b';
2282                   Skip;
2283
2284                when '-' =>
2285                   Pic.Max_Leading_Digits := Pic.Max_Leading_Digits + 1;
2286                   Pic.End_Float := Index;
2287                   Skip;
2288                   Set_State (Okay);  --  "-- " is enough
2289                   Floating_Minus;
2290                   Trailing_Currency;
2291                   return;
2292
2293                when '$' | '#' | '9' | '*' =>
2294                   if State /= Okay then
2295                      Pic.Floater := '!';
2296                      Pic.Start_Float := Invalid_Position;
2297                      Pic.End_Float := Invalid_Position;
2298                   end if;
2299
2300                   Picture;
2301                   Set_State (Okay);
2302                   return;
2303
2304                when 'Z' | 'z' =>
2305
2306                   --  Can't have Z and a floating sign
2307
2308                   if State = Okay then
2309                      Set_State (Reject);
2310                   end if;
2311
2312                   Pic.Picture.Expanded (Index) := 'Z'; -- consistency
2313                   Zero_Suppression;
2314                   Trailing_Currency;
2315                   Optional_RHS_Sign;
2316                   return;
2317
2318                when '.' | 'V' | 'v' =>
2319                   if State /= Okay then
2320                      Pic.Floater := '!';
2321                      Pic.Start_Float := Invalid_Position;
2322                      Pic.End_Float := Invalid_Position;
2323                   end if;
2324
2325                   --  Don't assume that state is okay, haven't seen a digit
2326
2327                   Picture;
2328                   return;
2329
2330                when others =>
2331                   return;
2332
2333             end case;
2334          end loop;
2335       end Picture_Minus;
2336
2337       ------------------
2338       -- Picture_Plus --
2339       ------------------
2340
2341       procedure Picture_Plus is
2342       begin
2343          Pic.Sign_Position := Index;
2344
2345          --  Treat as a floating sign, and unwind otherwise
2346
2347          Pic.Floater := '+';
2348          Pic.Start_Float := Index;
2349          Pic.End_Float := Index;
2350
2351          --  Don't increment Pic.Max_Leading_Digits, we need one "real"
2352          --  sign place.
2353
2354          Skip; --  Known Plus
2355
2356          loop
2357             case Look is
2358
2359                when '_' | '0' | '/' =>
2360                   Pic.End_Float := Index;
2361                   Skip;
2362
2363                when 'B' | 'b'  =>
2364                   Pic.End_Float := Index;
2365                   Pic.Picture.Expanded (Index) := 'b';
2366                   Skip;
2367
2368                when '+' =>
2369                   Pic.Max_Leading_Digits := Pic.Max_Leading_Digits + 1;
2370                   Pic.End_Float := Index;
2371                   Skip;
2372                   Set_State (Okay);  --  "++" is enough
2373                   Floating_Plus;
2374                   Trailing_Currency;
2375                   return;
2376
2377                when '$' | '#' | '9' | '*' =>
2378                   if State /= Okay then
2379                      Pic.Floater := '!';
2380                      Pic.Start_Float := Invalid_Position;
2381                      Pic.End_Float := Invalid_Position;
2382                   end if;
2383
2384                   Picture;
2385                   Set_State (Okay);
2386                   return;
2387
2388                when 'Z' | 'z' =>
2389                   if State = Okay then
2390                      Set_State (Reject);
2391                   end if;
2392
2393                   --  Can't have Z and a floating sign
2394
2395                   Pic.Picture.Expanded (Index) := 'Z'; -- consistency
2396
2397                   --  '+Z' is acceptable
2398
2399                   Set_State (Okay);
2400
2401                   Zero_Suppression;
2402                   Trailing_Currency;
2403                   Optional_RHS_Sign;
2404                   return;
2405
2406                when '.' | 'V' | 'v' =>
2407                   if State /= Okay then
2408                      Pic.Floater := '!';
2409                      Pic.Start_Float := Invalid_Position;
2410                      Pic.End_Float := Invalid_Position;
2411                   end if;
2412
2413                   --  Don't assume that state is okay, haven't seen a digit
2414
2415                   Picture;
2416                   return;
2417
2418                when others =>
2419                   return;
2420
2421             end case;
2422          end loop;
2423       end Picture_Plus;
2424
2425       --------------------
2426       -- Picture_String --
2427       --------------------
2428
2429       procedure Picture_String is
2430       begin
2431          while Is_Insert loop
2432             Skip;
2433          end loop;
2434
2435          case Look is
2436
2437             when '$' | '#' =>
2438                Picture;
2439                Optional_RHS_Sign;
2440
2441             when '+' =>
2442                Picture_Plus;
2443
2444             when '-' =>
2445                Picture_Minus;
2446
2447             when '<' =>
2448                Picture_Bracket;
2449
2450             when 'Z' | 'z' =>
2451                Pic.Picture.Expanded (Index) := 'Z'; -- consistency
2452                Zero_Suppression;
2453                Trailing_Currency;
2454                Optional_RHS_Sign;
2455
2456             when '*' =>
2457                Star_Suppression;
2458                Trailing_Currency;
2459                Optional_RHS_Sign;
2460
2461             when '9' | '.' | 'V' | 'v' =>
2462                Number;
2463                Trailing_Currency;
2464                Optional_RHS_Sign;
2465
2466             when others =>
2467                raise Picture_Error;
2468
2469          end case;
2470
2471          --  Blank when zero either if the PIC does not contain a '9' or if
2472          --  requested by the user and no '*'
2473
2474          Pic.Blank_When_Zero :=
2475            (Computed_BWZ or Pic.Blank_When_Zero) and not Pic.Star_Fill;
2476
2477          --  Star fill if '*' and no '9'
2478
2479          Pic.Star_Fill := Pic.Star_Fill and Computed_BWZ;
2480
2481          if not At_End then
2482             Set_State (Reject);
2483          end if;
2484
2485       end Picture_String;
2486
2487       ---------------
2488       -- Set_State --
2489       ---------------
2490
2491       procedure Set_State (L : Legality) is
2492       begin
2493          State := L;
2494       end Set_State;
2495
2496       ----------
2497       -- Skip --
2498       ----------
2499
2500       procedure Skip is
2501       begin
2502          Index := Index + 1;
2503       end Skip;
2504
2505       ----------------------
2506       -- Star_Suppression --
2507       ----------------------
2508
2509       procedure Star_Suppression is
2510       begin
2511          Pic.Floater := '*';
2512          Pic.Start_Float := Index;
2513          Pic.End_Float := Index;
2514          Pic.Max_Leading_Digits := Pic.Max_Leading_Digits + 1;
2515          Set_State (Okay);
2516
2517          --  Even a single * is a valid picture
2518
2519          Pic.Star_Fill := True;
2520          Skip; --  Known *
2521
2522          loop
2523             if At_End then
2524                return;
2525             end if;
2526
2527             case Look is
2528
2529                when '_' | '0' | '/' =>
2530                   Pic.End_Float := Index;
2531                   Skip;
2532
2533                when 'B' | 'b'  =>
2534                   Pic.End_Float := Index;
2535                   Pic.Picture.Expanded (Index) := 'b';
2536                   Skip;
2537
2538                when '*' =>
2539                   Pic.End_Float := Index;
2540                   Pic.Max_Leading_Digits := Pic.Max_Leading_Digits + 1;
2541                   Set_State (Okay); Skip;
2542
2543                when '9' =>
2544                   Set_State (Okay);
2545                   Number_Completion;
2546                   return;
2547
2548                when '.' | 'V' | 'v' =>
2549                   Pic.Radix_Position := Index;
2550                   Skip;
2551                   Number_Fraction_Or_Star_Fill;
2552                   return;
2553
2554                when '#' | '$' =>
2555                   Trailing_Currency;
2556                   Set_State (Okay);
2557                   return;
2558
2559                when others => raise Picture_Error;
2560             end case;
2561          end loop;
2562       end Star_Suppression;
2563
2564       ----------------------
2565       -- Trailing_Bracket --
2566       ----------------------
2567
2568       procedure Trailing_Bracket is
2569       begin
2570          if Look = '>' then
2571             Pic.Second_Sign := Index;
2572             Skip;
2573          else
2574             raise Picture_Error;
2575          end if;
2576       end Trailing_Bracket;
2577
2578       -----------------------
2579       -- Trailing_Currency --
2580       -----------------------
2581
2582       procedure Trailing_Currency is
2583       begin
2584          if At_End then
2585             return;
2586          end if;
2587
2588          if Look = '$' then
2589             Pic.Start_Currency := Index;
2590             Pic.End_Currency := Index;
2591             Skip;
2592
2593          else
2594             while not At_End and then Look = '#' loop
2595                if Pic.Start_Currency = Invalid_Position then
2596                   Pic.Start_Currency := Index;
2597                end if;
2598
2599                Pic.End_Currency := Index;
2600                Skip;
2601             end loop;
2602          end if;
2603
2604          loop
2605             if At_End then
2606                return;
2607             end if;
2608
2609             case Look is
2610                when '_' | '0' | '/' => Skip;
2611
2612                when 'B' | 'b'  =>
2613                   Pic.Picture.Expanded (Index) := 'b';
2614                   Skip;
2615
2616                when others => return;
2617             end case;
2618          end loop;
2619       end Trailing_Currency;
2620
2621       ----------------------
2622       -- Zero_Suppression --
2623       ----------------------
2624
2625       procedure Zero_Suppression is
2626       begin
2627          Pic.Floater := 'Z';
2628          Pic.Start_Float := Index;
2629          Pic.End_Float := Index;
2630          Pic.Max_Leading_Digits := Pic.Max_Leading_Digits + 1;
2631          Pic.Picture.Expanded (Index) := 'Z'; -- consistency
2632
2633          Skip; --  Known Z
2634
2635          loop
2636             --  Even a single Z is a valid picture
2637
2638             if At_End then
2639                Set_State (Okay);
2640                return;
2641             end if;
2642
2643             case Look is
2644                when '_' | '0' | '/' =>
2645                   Pic.End_Float := Index;
2646                   Skip;
2647
2648                when 'B' | 'b'  =>
2649                   Pic.End_Float := Index;
2650                   Pic.Picture.Expanded (Index) := 'b';
2651                   Skip;
2652
2653                when 'Z' | 'z' =>
2654                   Pic.Picture.Expanded (Index) := 'Z'; -- consistency
2655
2656                   Pic.Max_Leading_Digits := Pic.Max_Leading_Digits + 1;
2657                   Pic.End_Float := Index;
2658                   Set_State (Okay);
2659                   Skip;
2660
2661                when '9' =>
2662                   Set_State (Okay);
2663                   Number_Completion;
2664                   return;
2665
2666                when '.' | 'V' | 'v' =>
2667                   Pic.Radix_Position := Index;
2668                   Skip;
2669                   Number_Fraction_Or_Z_Fill;
2670                   return;
2671
2672                when '#' | '$' =>
2673                   Trailing_Currency;
2674                   Set_State (Okay);
2675                   return;
2676
2677                when others =>
2678                   return;
2679             end case;
2680          end loop;
2681       end Zero_Suppression;
2682
2683    --  Start of processing for Precalculate
2684
2685    begin
2686       Picture_String;
2687
2688       if State = Reject then
2689          raise Picture_Error;
2690       end if;
2691
2692    exception
2693
2694       when Constraint_Error =>
2695
2696       --  To deal with special cases like null strings
2697
2698       raise Picture_Error;
2699
2700    end Precalculate;
2701
2702    ----------------
2703    -- To_Picture --
2704    ----------------
2705
2706    function To_Picture
2707      (Pic_String      : String;
2708       Blank_When_Zero : Boolean := False) return Picture
2709    is
2710       Result : Picture;
2711
2712    begin
2713       declare
2714          Item : constant String := Expand (Pic_String);
2715
2716       begin
2717          Result.Contents.Picture         := (Item'Length, Item);
2718          Result.Contents.Original_BWZ := Blank_When_Zero;
2719          Result.Contents.Blank_When_Zero := Blank_When_Zero;
2720          Precalculate (Result.Contents);
2721          return Result;
2722       end;
2723
2724    exception
2725       when others =>
2726          raise Picture_Error;
2727
2728    end To_Picture;
2729
2730    -------------
2731    -- To_Wide --
2732    -------------
2733
2734    function To_Wide (C : Character) return Wide_Character is
2735    begin
2736       return Wide_Character'Val (Character'Pos (C));
2737    end To_Wide;
2738
2739    -----------
2740    -- Valid --
2741    -----------
2742
2743    function Valid
2744      (Pic_String      : String;
2745       Blank_When_Zero : Boolean := False) return Boolean
2746    is
2747    begin
2748       declare
2749          Expanded_Pic : constant String := Expand (Pic_String);
2750          --  Raises Picture_Error if Item not well-formed
2751
2752          Format_Rec : Format_Record;
2753
2754       begin
2755          Format_Rec.Picture := (Expanded_Pic'Length, Expanded_Pic);
2756          Format_Rec.Blank_When_Zero := Blank_When_Zero;
2757          Format_Rec.Original_BWZ := Blank_When_Zero;
2758          Precalculate (Format_Rec);
2759
2760          --  False only if Blank_When_0 is True but the pic string has a '*'
2761
2762          return not Blank_When_Zero
2763            or else Strings_Fixed.Index (Expanded_Pic, "*") = 0;
2764       end;
2765
2766    exception
2767       when others => return False;
2768    end Valid;
2769
2770 end Ada.Wide_Text_IO.Editing;