release/src/router/libncurses/Ada95/src/terminal_interface-curses-text_io.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                           GNAT ncurses Binding                           --
   4 --                                                                          --
   5 --                     Terminal_Interface.Curses.Text_IO                    --
   6 --                                                                          --
   7 --                                 B O D Y                                  --
   8 --                                                                          --
   9 ------------------------------------------------------------------------------
  10 -- Copyright (c) 1998-2009,2011 Free Software Foundation, Inc.              --
  11 --                                                                          --
  12 -- Permission is hereby granted, free of charge, to any person obtaining a  --
  13 -- copy of this software and associated documentation files (the            --
  14 -- "Software"), to deal in the Software without restriction, including      --
  15 -- without limitation the rights to use, copy, modify, merge, publish,      --
  16 -- distribute, distribute with modifications, sublicense, and/or sell       --
  17 -- copies of the Software, and to permit persons to whom the Software is    --
  18 -- furnished to do so, subject to the following conditions:                 --
  19 --                                                                          --
  20 -- The above copyright notice and this permission notice shall be included  --
  21 -- in all copies or substantial portions of the Software.                   --
  22 --                                                                          --
  23 -- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  --
  24 -- OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               --
  25 -- MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   --
  26 -- IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   --
  27 -- DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    --
  28 -- OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    --
  29 -- THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               --
  30 --                                                                          --
  31 -- Except as contained in this notice, the name(s) of the above copyright   --
  32 -- holders shall not be used in advertising or otherwise to promote the     --
  33 -- sale, use or other dealings in this Software without prior written       --
  34 -- authorization.                                                           --
  35 ------------------------------------------------------------------------------
  36 --  Author:  Juergen Pfeifer, 1996
  37 --  Version Control:
  38 --  $Revision: 1.20 $
  39 --  $Date: 2011/03/22 23:38:49 $
  40 --  Binding Version 01.00
  41 ------------------------------------------------------------------------------
  42 package body Terminal_Interface.Curses.Text_IO is
  43
  44    Default_Window : Window := Null_Window;
  45
  46    procedure Set_Window (Win : Window)
  47    is
  48    begin
  49       Default_Window := Win;
  50    end Set_Window;
  51
  52    function Get_Window return Window
  53    is
  54    begin
  55       if Default_Window = Null_Window then
  56          return Standard_Window;
  57       else
  58          return Default_Window;
  59       end if;
  60    end Get_Window;
  61    pragma Inline (Get_Window);
  62
  63    procedure Flush (Win : Window)
  64    is
  65    begin
  66       Refresh (Win);
  67    end Flush;
  68
  69    procedure Flush
  70    is
  71    begin
  72       Flush (Get_Window);
  73    end Flush;
  74
  75    --------------------------------------------
  76    -- Specification of line and page lengths --
  77    --------------------------------------------
  78
  79    --  There are no set routines in this package. I assume, that you allocate
  80    --  the window with an appropriate size.
  81    --  A scroll-window is interpreted as an page with unbounded page length,
  82    --  i.e. it returns the conventional 0 as page length.
  83
  84    function Line_Length (Win : Window) return Count
  85    is
  86       N_Lines : Line_Count;
  87       N_Cols  : Column_Count;
  88    begin
  89       Get_Size (Win, N_Lines, N_Cols);
  90       --  if Natural (N_Cols) > Natural (Count'Last) then
  91       --     raise Layout_Error;
  92       --  end if;
  93       return Count (N_Cols);
  94    end Line_Length;
  95
  96    function Line_Length return Count
  97    is
  98    begin
  99       return Line_Length (Get_Window);
 100    end Line_Length;
 101
 102    function Page_Length (Win : Window) return Count
 103    is
 104       N_Lines : Line_Count;
 105       N_Cols  : Column_Count;
 106    begin
 107       if Scrolling_Allowed (Win) then
 108          return 0;
 109       else
 110          Get_Size (Win, N_Lines, N_Cols);
 111          --  if Natural (N_Lines) > Natural (Count'Last) then
 112          --     raise Layout_Error;
 113          --  end if;
 114          return Count (N_Lines);
 115       end if;
 116    end Page_Length;
 117
 118    function Page_Length return Count
 119    is
 120    begin
 121       return Page_Length (Get_Window);
 122    end Page_Length;
 123
 124    ------------------------------------
 125    -- Column, Line, and Page Control --
 126    ------------------------------------
 127    procedure New_Line (Win : Window; Spacing : Positive_Count := 1)
 128    is
 129       P_Size : constant Count := Page_Length (Win);
 130    begin
 131       if not Spacing'Valid then
 132          raise Constraint_Error;
 133       end if;
 134
 135       for I in 1 .. Spacing loop
 136          if P_Size > 0 and then Line (Win) >= P_Size then
 137             New_Page (Win);
 138          else
 139             Add (Win, ASCII.LF);
 140          end if;
 141       end loop;
 142    end New_Line;
 143
 144    procedure New_Line (Spacing : Positive_Count := 1)
 145    is
 146    begin
 147       New_Line (Get_Window, Spacing);
 148    end New_Line;
 149
 150    procedure New_Page (Win : Window)
 151    is
 152    begin
 153       Clear (Win);
 154    end New_Page;
 155
 156    procedure New_Page
 157    is
 158    begin
 159       New_Page (Get_Window);
 160    end New_Page;
 161
 162    procedure Set_Col (Win : Window;  To : Positive_Count)
 163    is
 164       Y  : Line_Position;
 165       X1 : Column_Position;
 166       X2 : Column_Position;
 167       N  : Natural;
 168    begin
 169       if not To'Valid then
 170          raise Constraint_Error;
 171       end if;
 172
 173       Get_Cursor_Position (Win, Y, X1);
 174       N  := Natural (To); N := N - 1;
 175       X2 := Column_Position (N);
 176       if X1 > X2 then
 177          New_Line (Win, 1);
 178          X1 := 0;
 179       end if;
 180       if X1 < X2 then
 181          declare
 182             Filler : constant String (Integer (X1) .. (Integer (X2) - 1))
 183               := (others => ' ');
 184          begin
 185             Put (Win, Filler);
 186          end;
 187       end if;
 188    end Set_Col;
 189
 190    procedure Set_Col (To : Positive_Count)
 191    is
 192    begin
 193       Set_Col (Get_Window, To);
 194    end Set_Col;
 195
 196    procedure Set_Line (Win : Window; To : Positive_Count)
 197    is
 198       Y1 : Line_Position;
 199       Y2 : Line_Position;
 200       X  : Column_Position;
 201       N  : Natural;
 202    begin
 203       if not To'Valid then
 204          raise Constraint_Error;
 205       end if;
 206
 207       Get_Cursor_Position (Win, Y1, X);
 208       pragma Unreferenced (X);
 209       N  := Natural (To); N := N - 1;
 210       Y2 := Line_Position (N);
 211       if Y2 < Y1 then
 212          New_Page (Win);
 213          Y1 := 0;
 214       end if;
 215       if Y1 < Y2 then
 216          New_Line (Win, Positive_Count (Y2 - Y1));
 217       end if;
 218    end Set_Line;
 219
 220    procedure Set_Line (To : Positive_Count)
 221    is
 222    begin
 223       Set_Line (Get_Window, To);
 224    end Set_Line;
 225
 226    function Col (Win : Window) return Positive_Count
 227    is
 228       Y : Line_Position;
 229       X : Column_Position;
 230       N : Natural;
 231    begin
 232       Get_Cursor_Position (Win, Y, X);
 233       N := Natural (X); N := N + 1;
 234       --  if N > Natural (Count'Last) then
 235       --     raise Layout_Error;
 236       --  end if;
 237       return Positive_Count (N);
 238    end Col;
 239
 240    function Col return Positive_Count
 241    is
 242    begin
 243       return Col (Get_Window);
 244    end Col;
 245
 246    function Line (Win : Window) return Positive_Count
 247    is
 248       Y : Line_Position;
 249       X : Column_Position;
 250       N : Natural;
 251    begin
 252       Get_Cursor_Position (Win, Y, X);
 253       N := Natural (Y); N := N + 1;
 254       --  if N > Natural (Count'Last) then
 255       --     raise Layout_Error;
 256       --  end if;
 257       return Positive_Count (N);
 258    end Line;
 259
 260    function Line return Positive_Count
 261    is
 262    begin
 263       return Line (Get_Window);
 264    end Line;
 265
 266    -----------------------
 267    -- Characters Output --
 268    -----------------------
 269
 270    procedure Put (Win  : Window; Item : Character)
 271    is
 272       P_Size : constant Count := Page_Length (Win);
 273       Y : Line_Position;
 274       X : Column_Position;
 275       L : Line_Count;
 276       C : Column_Count;
 277    begin
 278       if P_Size > 0 then
 279          Get_Cursor_Position (Win, Y, X);
 280          Get_Size (Win, L, C);
 281          if (Y + 1) = L and then (X + 1) = C then
 282             New_Page (Win);
 283          end if;
 284       end if;
 285       Add (Win, Item);
 286    end Put;
 287
 288    procedure Put (Item : Character)
 289    is
 290    begin
 291       Put (Get_Window, Item);
 292    end Put;
 293
 294    --------------------
 295    -- Strings-Output --
 296    --------------------
 297
 298    procedure Put (Win  : Window; Item : String)
 299    is
 300       P_Size : constant Count := Page_Length (Win);
 301       Y : Line_Position;
 302       X : Column_Position;
 303       L : Line_Count;
 304       C : Column_Count;
 305    begin
 306       if P_Size > 0 then
 307          Get_Cursor_Position (Win, Y, X);
 308          Get_Size (Win, L, C);
 309          if (Y + 1) = L and then (X + 1 + Item'Length) >= C then
 310             New_Page (Win);
 311          end if;
 312       end if;
 313       Add (Win, Item);
 314    end Put;
 315
 316    procedure Put (Item : String)
 317    is
 318    begin
 319       Put (Get_Window, Item);
 320    end Put;
 321
 322    procedure Put_Line
 323      (Win  : Window;
 324       Item : String)
 325    is
 326    begin
 327       Put (Win, Item);
 328       New_Line (Win, 1);
 329    end Put_Line;
 330
 331    procedure Put_Line
 332      (Item : String)
 333    is
 334    begin
 335       Put_Line (Get_Window, Item);
 336    end Put_Line;
 337
 338 end Terminal_Interface.Curses.Text_IO;