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2015-05-05 Yvan Roux <yvan.roux@linaro.org>
[official-gcc.git] / gcc / ada / stylesw.adb
bloba708da9e5bc495798ad4125b19b67c155bb97258
1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT COMPILER COMPONENTS --
4 -- --
5 -- S T Y L E S W --
6 -- --
7 -- B o d y --
8 -- --
9 -- Copyright (C) 1992-2013, Free Software Foundation, Inc. --
10 -- --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING3. If not, go to --
19 -- http://www.gnu.org/licenses for a complete copy of the license. --
20 -- --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
23 -- --
24 ------------------------------------------------------------------------------
25
26 with Hostparm; use Hostparm;
27 with Opt; use Opt;
28 with Output; use Output;
29
30 package body Stylesw is
31
32 -- The following constant defines the default style options for -gnaty
33
34 Default_Style : constant String :=
35 "3" & -- indentation level is 3
36 "a" & -- check attribute casing
37 "A" & -- check array attribute indexes
38 "b" & -- check no blanks at end of lines
39 "c" & -- check comment formats
40 "e" & -- check end/exit labels present
41 "f" & -- check no form/feeds vertical tabs in source
42 "h" & -- check no horizontal tabs in source
43 "i" & -- check if-then layout
44 "k" & -- check casing rules for keywords
45 "l" & -- check reference manual layout
46 "m" & -- check line length <= 79 characters
47 "n" & -- check casing of package Standard idents
48 "p" & -- check pragma casing
49 "r" & -- check casing for identifier references
50 "s" & -- check separate subprogram specs present
51 "t"; -- check token separation rules
52
53 -- The following constant defines the GNAT style options, showing them
54 -- as additions to the standard default style check options.
55
56 GNAT_Style : constant String := Default_Style &
57 "d" & -- check no DOS line terminators
58 "I" & -- check mode IN
59 "S" & -- check separate lines after THEN or ELSE
60 "u" & -- check no unnecessary blank lines
61 "x"; -- check extra parentheses around conditionals
62
63 -- Note: we intend GNAT_Style to also include the following, but we do
64 -- not yet have the whole tool suite clean with respect to this.
65
66 -- "B" & -- check boolean operators
67
68 -------------------------------
69 -- Reset_Style_Check_Options --
70 -------------------------------
71
72 procedure Reset_Style_Check_Options is
73 begin
74 Style_Check_Indentation := 0;
75 Style_Check_Array_Attribute_Index := False;
76 Style_Check_Attribute_Casing := False;
77 Style_Check_Blanks_At_End := False;
78 Style_Check_Blank_Lines := False;
79 Style_Check_Boolean_And_Or := False;
80 Style_Check_Comments := False;
81 Style_Check_DOS_Line_Terminator := False;
82 Style_Check_End_Labels := False;
83 Style_Check_Form_Feeds := False;
84 Style_Check_Horizontal_Tabs := False;
85 Style_Check_If_Then_Layout := False;
86 Style_Check_Keyword_Casing := False;
87 Style_Check_Layout := False;
88 Style_Check_Max_Line_Length := False;
89 Style_Check_Max_Nesting_Level := False;
90 Style_Check_Missing_Overriding := False;
91 Style_Check_Mode_In := False;
92 Style_Check_Order_Subprograms := False;
93 Style_Check_Pragma_Casing := False;
94 Style_Check_References := False;
95 Style_Check_Separate_Stmt_Lines := False;
96 Style_Check_Specs := False;
97 Style_Check_Standard := False;
98 Style_Check_Tokens := False;
99 Style_Check_Xtra_Parens := False;
100 end Reset_Style_Check_Options;
101
102 ---------------------
103 -- RM_Column_Check --
104 ---------------------
105
106 function RM_Column_Check return Boolean is
107 begin
108 return Style_Check and Style_Check_Layout;
109 end RM_Column_Check;
110
111 ------------------------------
112 -- Save_Style_Check_Options --
113 ------------------------------
114
115 procedure Save_Style_Check_Options (Options : out Style_Check_Options) is
116 P : Natural := 0;
117
118 procedure Add (C : Character; S : Boolean);
119 -- Add given character C to string if switch S is true
120
121 procedure Add_Nat (N : Nat);
122 -- Add given natural number to string
123
124 ---------
125 -- Add --
126 ---------
127
128 procedure Add (C : Character; S : Boolean) is
129 begin
130 if S then
131 P := P + 1;
132 Options (P) := C;
133 end if;
134 end Add;
135
136 -------------
137 -- Add_Nat --
138 -------------
139
140 procedure Add_Nat (N : Nat) is
141 begin
142 if N > 9 then
143 Add_Nat (N / 10);
144 end if;
145
146 P := P + 1;
147 Options (P) := Character'Val (Character'Pos ('0') + N mod 10);
148 end Add_Nat;
149
150 -- Start of processing for Save_Style_Check_Options
151
152 begin
153 for K in Options'Range loop
154 Options (K) := ' ';
155 end loop;
156
157 Add (Character'Val (Style_Check_Indentation + Character'Pos ('0')),
158 Style_Check_Indentation /= 0);
159
160 Add ('a', Style_Check_Attribute_Casing);
161 Add ('A', Style_Check_Array_Attribute_Index);
162 Add ('b', Style_Check_Blanks_At_End);
163 Add ('B', Style_Check_Boolean_And_Or);
164
165 if Style_Check_Comments then
166 if Style_Check_Comments_Spacing = 2 then
167 Add ('c', Style_Check_Comments);
168 elsif Style_Check_Comments_Spacing = 1 then
169 Add ('C', Style_Check_Comments);
170 end if;
171 end if;
172
173 Add ('d', Style_Check_DOS_Line_Terminator);
174 Add ('e', Style_Check_End_Labels);
175 Add ('f', Style_Check_Form_Feeds);
176 Add ('h', Style_Check_Horizontal_Tabs);
177 Add ('i', Style_Check_If_Then_Layout);
178 Add ('I', Style_Check_Mode_In);
179 Add ('k', Style_Check_Keyword_Casing);
180 Add ('l', Style_Check_Layout);
181 Add ('n', Style_Check_Standard);
182 Add ('o', Style_Check_Order_Subprograms);
183 Add ('O', Style_Check_Missing_Overriding);
184 Add ('p', Style_Check_Pragma_Casing);
185 Add ('r', Style_Check_References);
186 Add ('s', Style_Check_Specs);
187 Add ('S', Style_Check_Separate_Stmt_Lines);
188 Add ('t', Style_Check_Tokens);
189 Add ('u', Style_Check_Blank_Lines);
190 Add ('x', Style_Check_Xtra_Parens);
191
192 if Style_Check_Max_Line_Length then
193 P := P + 1;
194 Options (P) := 'M';
195 Add_Nat (Style_Max_Line_Length);
196 end if;
197
198 if Style_Check_Max_Nesting_Level then
199 P := P + 1;
200 Options (P) := 'L';
201 Add_Nat (Style_Max_Nesting_Level);
202 end if;
203
204 pragma Assert (P <= Options'Last);
205
206 while P < Options'Last loop
207 P := P + 1;
208 Options (P) := ' ';
209 end loop;
210 end Save_Style_Check_Options;
211
212 -------------------------------------
213 -- Set_Default_Style_Check_Options --
214 -------------------------------------
215
216 procedure Set_Default_Style_Check_Options is
217 begin
218 Reset_Style_Check_Options;
219 Set_Style_Check_Options (Default_Style);
220 end Set_Default_Style_Check_Options;
221
222 ----------------------------------
223 -- Set_GNAT_Style_Check_Options --
224 ----------------------------------
225
226 procedure Set_GNAT_Style_Check_Options is
227 begin
228 Reset_Style_Check_Options;
229 Set_Style_Check_Options (GNAT_Style);
230 end Set_GNAT_Style_Check_Options;
231
232 -----------------------------
233 -- Set_Style_Check_Options --
234 -----------------------------
235
236 -- Version used when no error checking is required
237
238 procedure Set_Style_Check_Options (Options : String) is
239 OK : Boolean;
240 EC : Natural;
241 pragma Warnings (Off, EC);
242 begin
243 Set_Style_Check_Options (Options, OK, EC);
244 pragma Assert (OK);
245 end Set_Style_Check_Options;
246
247 -- Normal version with error checking
248
249 procedure Set_Style_Check_Options
250 (Options : String;
251 OK : out Boolean;
252 Err_Col : out Natural)
253 is
254 C : Character;
255
256 On : Boolean := True;
257 -- Set to False if minus encountered
258 -- Set to True if plus encountered
259
260 Last_Option : Character := ' ';
261 -- Set to last character encountered
262
263 procedure Add_Img (N : Natural);
264 -- Concatenates image of N at end of Style_Msg_Buf
265
266 procedure Bad_Style_Switch (Msg : String);
267 -- Called if bad style switch found. Msg is set in Style_Msg_Buf and
268 -- Style_Msg_Len. OK is set False.
269
270 -------------
271 -- Add_Img --
272 -------------
273
274 procedure Add_Img (N : Natural) is
275 begin
276 if N >= 10 then
277 Add_Img (N / 10);
278 end if;
279
280 Style_Msg_Len := Style_Msg_Len + 1;
281 Style_Msg_Buf (Style_Msg_Len) :=
282 Character'Val (N mod 10 + Character'Pos ('0'));
283 end Add_Img;
284
285 ----------------------
286 -- Bad_Style_Switch --
287 ----------------------
288
289 procedure Bad_Style_Switch (Msg : String) is
290 begin
291 OK := False;
292 Style_Msg_Len := Msg'Length;
293 Style_Msg_Buf (1 .. Style_Msg_Len) := Msg;
294 end Bad_Style_Switch;
295
296 -- Start of processing for Set_Style_Check_Options
297
298 begin
299 Err_Col := Options'First;
300 while Err_Col <= Options'Last loop
301 C := Options (Err_Col);
302 Last_Option := C;
303 Err_Col := Err_Col + 1;
304
305 -- Turning switches on
306
307 if On then
308 case C is
309
310 when '+' =>
311 null;
312
313 when '-' =>
314 On := False;
315
316 when '0' .. '9' =>
317 Style_Check_Indentation :=
318 Character'Pos (C) - Character'Pos ('0');
319
320 when 'a' =>
321 Style_Check_Attribute_Casing := True;
322
323 when 'A' =>
324 Style_Check_Array_Attribute_Index := True;
325
326 when 'b' =>
327 Style_Check_Blanks_At_End := True;
328
329 when 'B' =>
330 Style_Check_Boolean_And_Or := True;
331
332 when 'c' =>
333 Style_Check_Comments := True;
334 Style_Check_Comments_Spacing := 2;
335
336 when 'C' =>
337 Style_Check_Comments := True;
338 Style_Check_Comments_Spacing := 1;
339
340 when 'd' =>
341 Style_Check_DOS_Line_Terminator := True;
342
343 when 'e' =>
344 Style_Check_End_Labels := True;
345
346 when 'f' =>
347 Style_Check_Form_Feeds := True;
348
349 when 'g' =>
350 Set_GNAT_Style_Check_Options;
351
352 when 'h' =>
353 Style_Check_Horizontal_Tabs := True;
354
355 when 'i' =>
356 Style_Check_If_Then_Layout := True;
357
358 when 'I' =>
359 Style_Check_Mode_In := True;
360
361 when 'k' =>
362 Style_Check_Keyword_Casing := True;
363
364 when 'l' =>
365 Style_Check_Layout := True;
366
367 when 'L' =>
368 Style_Max_Nesting_Level := 0;
369
370 if Err_Col > Options'Last
371 or else Options (Err_Col) not in '0' .. '9'
372 then
373 Bad_Style_Switch ("invalid nesting level");
374 return;
375 end if;
376
377 loop
378 Style_Max_Nesting_Level :=
379 Style_Max_Nesting_Level * 10 +
380 Character'Pos (Options (Err_Col)) - Character'Pos ('0');
381
382 if Style_Max_Nesting_Level > 999 then
383 Bad_Style_Switch
384 ("max nesting level (999) exceeded in style check");
385 return;
386 end if;
387
388 Err_Col := Err_Col + 1;
389 exit when Err_Col > Options'Last
390 or else Options (Err_Col) not in '0' .. '9';
391 end loop;
392
393 Style_Check_Max_Nesting_Level := Style_Max_Nesting_Level /= 0;
394
395 when 'm' =>
396 Style_Check_Max_Line_Length := True;
397 Style_Max_Line_Length := 79;
398
399 when 'M' =>
400 Style_Max_Line_Length := 0;
401
402 if Err_Col > Options'Last
403 or else Options (Err_Col) not in '0' .. '9'
404 then
405 Bad_Style_Switch
406 ("invalid line length in style check");
407 return;
408 end if;
409
410 loop
411 Style_Max_Line_Length :=
412 Style_Max_Line_Length * 10 +
413 Character'Pos (Options (Err_Col)) - Character'Pos ('0');
414
415 if Style_Max_Line_Length > Int (Max_Line_Length) then
416 OK := False;
417 Style_Msg_Buf (1 .. 27) := "max line length allowed is ";
418 Style_Msg_Len := 27;
419 Add_Img (Natural (Max_Line_Length));
420 return;
421 end if;
422
423 Err_Col := Err_Col + 1;
424 exit when Err_Col > Options'Last
425 or else Options (Err_Col) not in '0' .. '9';
426 end loop;
427
428 Style_Check_Max_Line_Length := Style_Max_Line_Length /= 0;
429
430 when 'n' =>
431 Style_Check_Standard := True;
432
433 when 'N' =>
434 Reset_Style_Check_Options;
435
436 when 'o' =>
437 Style_Check_Order_Subprograms := True;
438
439 when 'O' =>
440 Style_Check_Missing_Overriding := True;
441
442 when 'p' =>
443 Style_Check_Pragma_Casing := True;
444
445 when 'r' =>
446 Style_Check_References := True;
447
448 when 's' =>
449 Style_Check_Specs := True;
450
451 when 'S' =>
452 Style_Check_Separate_Stmt_Lines := True;
453
454 when 't' =>
455 Style_Check_Tokens := True;
456
457 when 'u' =>
458 Style_Check_Blank_Lines := True;
459
460 when 'x' =>
461 Style_Check_Xtra_Parens := True;
462
463 when 'y' =>
464 Set_Default_Style_Check_Options;
465
466 when ' ' =>
467 null;
468
469 when others =>
470 if Ignore_Unrecognized_VWY_Switches then
471 Write_Line ("unrecognized switch -gnaty" & C & " ignored");
472 else
473 Err_Col := Err_Col - 1;
474 Bad_Style_Switch ("invalid style switch: " & C);
475 return;
476 end if;
477 end case;
478
479 -- Turning switches off
480
481 else
482 case C is
483
484 when '+' =>
485 On := True;
486
487 when '-' =>
488 null;
489
490 when '0' .. '9' =>
491 Style_Check_Indentation := 0;
492
493 when 'a' =>
494 Style_Check_Attribute_Casing := False;
495
496 when 'A' =>
497 Style_Check_Array_Attribute_Index := False;
498
499 when 'b' =>
500 Style_Check_Blanks_At_End := False;
501
502 when 'B' =>
503 Style_Check_Boolean_And_Or := False;
504
505 when 'c' | 'C' =>
506 Style_Check_Comments := False;
507
508 when 'd' =>
509 Style_Check_DOS_Line_Terminator := False;
510
511 when 'e' =>
512 Style_Check_End_Labels := False;
513
514 when 'f' =>
515 Style_Check_Form_Feeds := False;
516
517 when 'g' =>
518 Reset_Style_Check_Options;
519
520 when 'h' =>
521 Style_Check_Horizontal_Tabs := False;
522
523 when 'i' =>
524 Style_Check_If_Then_Layout := False;
525
526 when 'I' =>
527 Style_Check_Mode_In := False;
528
529 when 'k' =>
530 Style_Check_Keyword_Casing := False;
531
532 when 'l' =>
533 Style_Check_Layout := False;
534
535 when 'L' =>
536 Style_Max_Nesting_Level := 0;
537
538 when 'm' =>
539 Style_Check_Max_Line_Length := False;
540
541 when 'M' =>
542 Style_Max_Line_Length := 0;
543 Style_Check_Max_Line_Length := False;
544
545 when 'n' =>
546 Style_Check_Standard := False;
547
548 when 'o' =>
549 Style_Check_Order_Subprograms := False;
550
551 when 'O' =>
552 Style_Check_Missing_Overriding := False;
553
554 when 'p' =>
555 Style_Check_Pragma_Casing := False;
556
557 when 'r' =>
558 Style_Check_References := False;
559
560 when 's' =>
561 Style_Check_Specs := False;
562
563 when 'S' =>
564 Style_Check_Separate_Stmt_Lines := False;
565
566 when 't' =>
567 Style_Check_Tokens := False;
568
569 when 'u' =>
570 Style_Check_Blank_Lines := False;
571
572 when 'x' =>
573 Style_Check_Xtra_Parens := False;
574
575 when ' ' =>
576 null;
577
578 when others =>
579 if Ignore_Unrecognized_VWY_Switches then
580 Write_Line ("unrecognized switch -gnaty-" & C & " ignored");
581 else
582 Err_Col := Err_Col - 1;
583 Bad_Style_Switch ("invalid style switch: " & C);
584 return;
585 end if;
586 end case;
587 end if;
588 end loop;
589
590 -- Turn on style checking if other than N at end of string
591
592 Style_Check := (Last_Option /= 'N');
593 OK := True;
594 end Set_Style_Check_Options;
595 end Stylesw;
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