aboutsummaryrefslogtreecommitdiff
path: root/gcc/ada/output.adb
blob: 5ac680176b838c3e91efc3a356fa516fd8b16fe0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
------------------------------------------------------------------------------
--                                                                          --
--                         GNAT COMPILER COMPONENTS                         --
--                                                                          --
--                               O U T P U T                                --
--                                                                          --
--                                 B o d y                                  --
--                                                                          --
--          Copyright (C) 1992-2010, Free Software Foundation, Inc.         --
--                                                                          --
-- GNAT is free software;  you can  redistribute it  and/or modify it under --
-- terms of the  GNU General Public License as published  by the Free Soft- --
-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
--                                                                          --
-- As a special exception under Section 7 of GPL version 3, you are granted --
-- additional permissions described in the GCC Runtime Library Exception,   --
-- version 3.1, as published by the Free Software Foundation.               --
--                                                                          --
-- You should have received a copy of the GNU General Public License and    --
-- a copy of the GCC Runtime Library Exception along with this program;     --
-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
-- <http://www.gnu.org/licenses/>.                                          --
--                                                                          --
-- GNAT was originally developed  by the GNAT team at  New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc.      --
--                                                                          --
------------------------------------------------------------------------------

package body Output is

   Current_FD : File_Descriptor := Standout;
   --  File descriptor for current output

   Special_Output_Proc : Output_Proc := null;
   --  Record argument to last call to Set_Special_Output. If this is
   --  non-null, then we are in special output mode.

   Indentation_Amount : constant Positive := 3;
   --  Number of spaces to output for each indentation level

   Indentation_Limit : constant Positive := 40;
   --  Indentation beyond this number of spaces wraps around

   pragma Assert (Indentation_Limit < Buffer_Max / 2);
   --  Make sure this is substantially shorter than the line length

   Cur_Indentation : Natural := 0;
   --  Number of spaces to indent each line

   -----------------------
   -- Local_Subprograms --
   -----------------------

   procedure Flush_Buffer;
   --  Flush buffer if non-empty and reset column counter

   ---------------------------
   -- Cancel_Special_Output --
   ---------------------------

   procedure Cancel_Special_Output is
   begin
      Special_Output_Proc := null;
   end Cancel_Special_Output;

   ------------
   -- Column --
   ------------

   function Column return Pos is
   begin
      return Pos (Next_Col);
   end Column;

   ------------------
   -- Flush_Buffer --
   ------------------

   procedure Flush_Buffer is
      Write_Error : exception;
      --  Raised if Write fails

      ------------------
      -- Write_Buffer --
      ------------------

      procedure Write_Buffer (Buf : String);
      --  Write out Buf, either using Special_Output_Proc, or the normal way
      --  using Write. Raise Write_Error if Write fails (presumably due to disk
      --  full). Write_Error is not used in the case of Special_Output_Proc.

      procedure Write_Buffer (Buf : String) is
      begin
         --  If Special_Output_Proc has been set, then use it

         if Special_Output_Proc /= null then
            Special_Output_Proc.all (Buf);

         --  If output is not set, then output to either standard output
         --  or standard error.

         elsif Write (Current_FD, Buf'Address, Buf'Length) /= Buf'Length then
            raise Write_Error;

         end if;
      end Write_Buffer;

      Len : constant Natural := Next_Col - 1;

   --  Start of processing for Flush_Buffer

   begin
      if Len /= 0 then
         begin
            --  If there's no indentation, or if the line is too long with
            --  indentation, or if it's a blank line, just write the buffer.

            if Cur_Indentation = 0
              or else Cur_Indentation + Len > Buffer_Max
              or else Buffer (1 .. Len) = (1 => ASCII.LF)
            then
               Write_Buffer (Buffer (1 .. Len));

            --  Otherwise, construct a new buffer with preceding spaces, and
            --  write that.

            else
               declare
                  Indented_Buffer : constant String :=
                                      (1 .. Cur_Indentation => ' ') &
                                                          Buffer (1 .. Len);
               begin
                  Write_Buffer (Indented_Buffer);
               end;
            end if;

         exception
            when Write_Error =>

               --  If there are errors with standard error just quit. Otherwise
               --  set the output to standard error before reporting a failure
               --  and quitting.

               if Current_FD /= Standerr then
                  Current_FD := Standerr;
                  Next_Col := 1;
                  Write_Line ("fatal error: disk full");
               end if;

               OS_Exit (2);
         end;

         --  Buffer is now empty

         Next_Col := 1;
      end if;
   end Flush_Buffer;

   -------------------
   -- Ignore_Output --
   -------------------

   procedure Ignore_Output (S : String) is
   begin
      null;
   end Ignore_Output;

   ------------
   -- Indent --
   ------------

   procedure Indent is
   begin
      --  The "mod" in the following assignment is to cause a wrap around in
      --  the case where there is too much indentation.

      Cur_Indentation :=
        (Cur_Indentation + Indentation_Amount) mod Indentation_Limit;
   end Indent;

   -------------
   -- Outdent --
   -------------

   procedure Outdent is
   begin
      --  The "mod" here undoes the wrap around from Indent above

      Cur_Indentation :=
        (Cur_Indentation - Indentation_Amount) mod Indentation_Limit;
   end Outdent;

   ---------------------------
   -- Restore_Output_Buffer --
   ---------------------------

   procedure Restore_Output_Buffer (S : Saved_Output_Buffer) is
   begin
      Next_Col := S.Next_Col;
      Cur_Indentation := S.Cur_Indentation;
      Buffer (1 .. Next_Col - 1) := S.Buffer (1 .. Next_Col - 1);
   end Restore_Output_Buffer;

   ------------------------
   -- Save_Output_Buffer --
   ------------------------

   function Save_Output_Buffer return Saved_Output_Buffer is
      S : Saved_Output_Buffer;
   begin
      S.Buffer (1 .. Next_Col - 1) := Buffer (1 .. Next_Col - 1);
      S.Next_Col := Next_Col;
      S.Cur_Indentation := Cur_Indentation;
      Next_Col := 1;
      Cur_Indentation := 0;
      return S;
   end Save_Output_Buffer;

   ------------------------
   -- Set_Special_Output --
   ------------------------

   procedure Set_Special_Output (P : Output_Proc) is
   begin
      Special_Output_Proc := P;
   end Set_Special_Output;

   ----------------
   -- Set_Output --
   ----------------

   procedure Set_Output (FD : File_Descriptor) is
   begin
      if Special_Output_Proc = null then
         Flush_Buffer;
      end if;

      Current_FD := FD;
   end Set_Output;

   ------------------------
   -- Set_Standard_Error --
   ------------------------

   procedure Set_Standard_Error is
   begin
      Set_Output (Standerr);
   end Set_Standard_Error;

   -------------------------
   -- Set_Standard_Output --
   -------------------------

   procedure Set_Standard_Output is
   begin
      Set_Output (Standout);
   end Set_Standard_Output;

   -------
   -- w --
   -------

   procedure w (C : Character) is
   begin
      Write_Char (''');
      Write_Char (C);
      Write_Char (''');
      Write_Eol;
   end w;

   procedure w (S : String) is
   begin
      Write_Str (S);
      Write_Eol;
   end w;

   procedure w (V : Int) is
   begin
      Write_Int (V);
      Write_Eol;
   end w;

   procedure w (B : Boolean) is
   begin
      if B then
         w ("True");
      else
         w ("False");
      end if;
   end w;

   procedure w (L : String; C : Character) is
   begin
      Write_Str (L);
      Write_Char (' ');
      w (C);
   end w;

   procedure w (L : String; S : String) is
   begin
      Write_Str (L);
      Write_Char (' ');
      w (S);
   end w;

   procedure w (L : String; V : Int) is
   begin
      Write_Str (L);
      Write_Char (' ');
      w (V);
   end w;

   procedure w (L : String; B : Boolean) is
   begin
      Write_Str (L);
      Write_Char (' ');
      w (B);
   end w;

   ----------------
   -- Write_Char --
   ----------------

   procedure Write_Char (C : Character) is
   begin
      if Next_Col = Buffer'Length then
         Write_Eol;
      end if;

      if C = ASCII.LF then
         Write_Eol;
      else
         Buffer (Next_Col) := C;
         Next_Col := Next_Col + 1;
      end if;
   end Write_Char;

   ---------------
   -- Write_Eol --
   ---------------

   procedure Write_Eol is
   begin
      --  Remove any trailing space

      while Next_Col > 1 and then Buffer (Next_Col - 1) = ' ' loop
         Next_Col := Next_Col - 1;
      end loop;

      Buffer (Next_Col) := ASCII.LF;
      Next_Col := Next_Col + 1;
      Flush_Buffer;
   end Write_Eol;

   ---------------------------
   -- Write_Eol_Keep_Blanks --
   ---------------------------

   procedure Write_Eol_Keep_Blanks is
   begin
      Buffer (Next_Col) := ASCII.LF;
      Next_Col := Next_Col + 1;
      Flush_Buffer;
   end Write_Eol_Keep_Blanks;

   ----------------------
   -- Write_Erase_Char --
   ----------------------

   procedure Write_Erase_Char (C : Character) is
   begin
      if Next_Col /= 1 and then Buffer (Next_Col - 1) = C then
         Next_Col := Next_Col - 1;
      end if;
   end Write_Erase_Char;

   ---------------
   -- Write_Int --
   ---------------

   procedure Write_Int (Val : Int) is
   begin
      if Val < 0 then
         Write_Char ('-');
         Write_Int (-Val);

      else
         if Val > 9 then
            Write_Int (Val / 10);
         end if;

         Write_Char (Character'Val ((Val mod 10) + Character'Pos ('0')));
      end if;
   end Write_Int;

   ----------------
   -- Write_Line --
   ----------------

   procedure Write_Line (S : String) is
   begin
      Write_Str (S);
      Write_Eol;
   end Write_Line;

   ------------------
   -- Write_Spaces --
   ------------------

   procedure Write_Spaces (N : Nat) is
   begin
      for J in 1 .. N loop
         Write_Char (' ');
      end loop;
   end Write_Spaces;

   ---------------
   -- Write_Str --
   ---------------

   procedure Write_Str (S : String) is
   begin
      for J in S'Range loop
         Write_Char (S (J));
      end loop;
   end Write_Str;

end Output;