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
|
------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- S T Y L E S W --
-- --
-- S p e c --
-- --
-- Copyright (C) 1992-2022, 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. See the GNU General Public License --
-- for more details. You should have received a copy of the GNU General --
-- Public License distributed with GNAT; see file COPYING3. If not, go to --
-- http://www.gnu.org/licenses for a complete copy of the license. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
-- This package contains the style switches used for setting style options.
-- The only clients of this package are the body of Style and the body of
-- Switches. All other style checking issues are handled using the public
-- interfaces in the spec of Style.
with Types; use Types;
package Stylesw is
--------------------------
-- Style Check Switches --
--------------------------
-- These flags are used to control the details of the style checking
-- options. The default values shown here correspond to no style checking.
-- If any of these values is set to a non-default value, then
-- Opt.Style_Check is set True to activate calls to this package.
-- The actual mechanism for setting these switches to other than default
-- values is via the Set_Style_Check_Options procedure or through a call to
-- Set_Default_Style_Check_Options. They should not be set directly in any
-- other manner.
Style_Check_Array_Attribute_Index : Boolean := False;
-- This can be set True by using the -gnatyA switch. If it is True then
-- index numbers for array attributes (like Length) are required to be
-- absent for one-dimensional arrays and present for multi-dimensional
-- array attribute references.
Style_Check_Attribute_Casing : Boolean := False;
-- This can be set True by using the -gnatya switch. If it is True, then
-- attribute names (including keywords such as digits used as attribute
-- names) must be in mixed case.
Style_Check_Blanks_At_End : Boolean := False;
-- This can be set True by using the -gnatyb switch. If it is True, then
-- spaces at the end of lines are not permitted.
Style_Check_Blank_Lines : Boolean := False;
-- This can be set True by using the -gnatyu switch. If it is True, then
-- multiple blank lines are not permitted, and there may not be a blank
-- line at the end of the file.
Style_Check_Boolean_And_Or : Boolean := False;
-- This can be set True by using the -gnatyB switch. If it is True, then
-- the use of AND THEN/OR ELSE rather than AND/OR is required except for
-- the following cases:
--
-- a) Both operands are simple Boolean constants or variables
-- b) Both operands are of a modular type
-- c) Both operands are of an array type
Style_Check_Comments : Boolean := False;
-- This can be set True by using the -gnatyc switch. If it is True, then
-- comments are style checked as follows:
--
-- All comments must be at the start of the line, or the first minus must
-- be preceded by at least one space.
--
-- For a comment that is not at the start of a line, the only requirement
-- is that a space follow the comment characters.
--
-- For a comment that is at the start of the line, one of the following
-- conditions must hold:
--
-- The comment characters are the only non-blank characters on the line
--
-- The comment characters are followed by an exclamation point (the
-- sequence --! is used by gnatprep for marking deleted lines).
--
-- The comment characters are followed by two space characters if
-- Comment_Spacing = 2, else by one character if Comment_Spacing = 1.
--
-- The line consists entirely of minus signs
--
-- The comment characters are followed by a single space, and the last
-- two characters on the line are also comment characters.
--
-- Note: the reason for the last two conditions is to allow "boxed"
-- comments where only a single space separates the comment characters.
Style_Check_Comments_Spacing : Nat range 1 .. 2;
-- Spacing required for comments, valid only if Style_Check_Comments true.
Style_Check_DOS_Line_Terminator : Boolean := False;
-- This can be set true by using the -gnatyd switch. If it is True, then
-- the line terminator must be a single LF, without an associated CR (e.g.
-- DOS line terminator sequence CR/LF not allowed).
Style_Check_Mixed_Case_Decls : Boolean := False;
-- This can be set True by using the -gnatyD switch. If it is True, then
-- declared identifiers must be in Mixed_Case.
Style_Check_End_Labels : Boolean := False;
-- This can be set True by using the -gnatye switch. If it is True, then
-- optional END labels must always be present.
Style_Check_Form_Feeds : Boolean := False;
-- This can be set True by using the -gnatyf switch. If it is True, then
-- form feeds and vertical tabs are not allowed in the source text.
Style_Check_Horizontal_Tabs : Boolean := False;
-- This can be set True by using the -gnatyh switch. If it is True, then
-- horizontal tabs are not allowed in source text.
Style_Check_If_Then_Layout : Boolean := False;
-- This can be set True by using the -gnatyi switch. If it is True, then a
-- THEN keyword must either appear on the same line as the IF, or on a line
-- all on its own.
--
-- This permits one of two styles for IF-THEN layout. Either the IF and
-- THEN keywords are on the same line, where the condition is short enough,
-- or the conditions are continued over to the lines following the IF and
-- the THEN stands on its own. For example:
--
-- if X > Y then
--
-- if X > Y
-- and then Y < Z
-- then
--
-- if X > Y and then Z > 0
-- then
--
-- are allowed, but
--
-- if X > Y
-- and then B > C then
--
-- is not allowed.
Style_Check_Indentation : Column_Number range 0 .. 9 := 0;
-- This can be set non-zero by using the -gnaty? (? a digit) switch. If
-- it is non-zero it activates indentation checking with the indicated
-- indentation value. A value of zero turns off checking. The requirement
-- is that any new statement, line comment, declaration or keyword such
-- as END, start on a column that is a multiple of the indentation value.
Style_Check_Keyword_Casing : Boolean := False;
-- This can be set True by using the -gnatyk switch. If it is True, then
-- keywords are required to be in all lower case. This rule does not apply
-- to keywords such as digits appearing as an attribute name.
Style_Check_Layout : Boolean := False;
-- This can be set True by using the -gnatyl switch. If it is True, it
-- activates checks that constructs are indented as suggested by the
-- examples in the RM syntax, e.g. that the ELSE keyword must line up
-- with the IF keyword.
Style_Check_Max_Line_Length : Boolean := False;
-- This can be set True by using the -gnatym/M switches. If it is True, it
-- activates checking for a maximum line length of Style_Max_Line_Length
-- characters.
Style_Check_Max_Nesting_Level : Boolean := False;
-- This can be set True by using -gnatyLnnn with a value other than zero
-- (a value of zero resets it to False). If True, it activates checking
-- the maximum nesting level against Style_Max_Nesting_Level.
Style_Check_Missing_Overriding : Boolean := False;
-- This can be set True by using the -gnatyO switch. If it is True, then
-- "overriding" is required in subprogram declarations and bodies where
-- appropriate. Note that "not overriding" is never required.
Style_Check_Mode_In : Boolean := False;
-- This can be set True by using -gnatyI. If True, it activates checking
-- that mode IN is not used on its own (since it is the default).
Style_Check_Order_Subprograms : Boolean := False;
-- This can be set True by using the -gnatyo switch. If it is True, then
-- names of subprogram bodies must be in alphabetical order (not taking
-- casing into account).
Style_Check_Pragma_Casing : Boolean := False;
-- This can be set True by using the -gnatyp switch. If it is True, then
-- pragma names must use mixed case.
Style_Check_References : Boolean := False;
-- This can be set True by using the -gnatyr switch. If it is True, then
-- all references to declared identifiers are checked. The requirement
-- is that casing of the reference be the same as the casing of the
-- corresponding declaration.
Style_Check_Separate_Stmt_Lines : Boolean := False;
-- This can be set True by using the -gnatyS switch. If it is TRUE,
-- then for the case of keywords THEN (not preceded by AND) or ELSE (not
-- preceded by OR) which introduce a conditionally executed statement
-- sequence, there must be no tokens on the same line as the keyword, so
-- that coverage testing can clearly identify execution of the statement
-- sequence. A comment is permitted, as is THEN ABORT or a PRAGMA keyword
-- after ELSE (a common style to specify the condition for the ELSE).
Style_Check_Specs : Boolean := False;
-- This can be set True by using the -gnatys switches. If it is True, then
-- separate specs are required to be present for all procedures except
-- parameterless library level procedures. The exception means that typical
-- main programs do not require separate specs.
Style_Check_Standard : Boolean := False;
-- This can be set True by using the -gnatyn switch. If it is True, then
-- any references to names in Standard have to be cased in a manner that
-- is consistent with the Ada RM (usually Mixed case, as in Long_Integer)
-- but there are some exceptions (e.g. NUL, ASCII).
Style_Check_Tokens : Boolean := False;
-- This can be set True by using the -gnatyt switch. If it is True, then
-- the style check that requires canonical spacing between various
-- punctuation tokens as follows:
--
-- ABS and NOT must be followed by a space
--
-- => must be surrounded by spaces
--
-- <> must be preceded by a space or left paren
--
-- Binary operators other than ** must be surrounded by spaces.
--
-- There is no restriction on the layout of the ** binary operator.
--
-- Colon must be surrounded by spaces
--
-- Colon-equal (assignment) must be surrounded by spaces
--
-- Comma must be the first non-blank character on the line, or be
-- immediately preceded by a non-blank character, and must be followed
-- by a blank.
--
-- A space must precede a left paren following a digit or letter, and a
-- right paren must not be followed by a space (it can be at the end of
-- the line).
--
-- A right paren must either be the first non-blank character on a line,
-- or it must be preceded by a non-blank character.
--
-- A semicolon must not be preceded by a blank, and must not be followed
-- by a non-blank character.
--
-- A unary plus or minus may not be followed by a space
--
-- There must be one blank (and no other white space) between NOT and IN
--
-- A vertical bar must be surrounded by spaces
--
-- Note that a requirement that a token be preceded by a space is met by
-- placing the token at the start of the line, and similarly a requirement
-- that a token be followed by a space is met by placing the token at
-- the end of the line. Note that in the case where horizontal tabs are
-- permitted, a horizontal tab is acceptable for meeting the requirement
-- for a space.
Style_Check_Xtra_Parens : Boolean := False;
-- This can be set True by using the -gnatyx switch. If true, then it is
-- not allowed to enclose entire expressions in tests in parentheses
-- (C style), e.g. if (x = y) then ... is not allowed.
Style_Max_Line_Length : Nat := 0;
-- Value used to check maximum line length. Gets reset as a result of
-- use of -gnatym or -gnatyMnnn switches. This value is only read if
-- Style_Check_Max_Line_Length is True.
Style_Max_Nesting_Level : Nat := 0;
-- Value used to check maximum nesting level. Gets reset as a result
-- of use of the -gnatyLnnn switch. This value is only read if
-- Style_Check_Max_Nesting_Level is True.
-----------------
-- Subprograms --
-----------------
function RM_Column_Check return Boolean;
-- Determines whether style checking is active and the RM column check
-- mode is set requiring checking of RM format layout.
procedure Set_Default_Style_Check_Options;
-- This procedure is called to set the default style checking options in
-- response to a -gnaty switch with no suboptions or from -gnatyy.
procedure Set_GNAT_Style_Check_Options;
-- This procedure is called to set the default style checking options for
-- GNAT units (as set by -gnatg or -gnatyg).
Style_Msg_Buf : String (1 .. 80);
Style_Msg_Len : Natural;
-- Used to return
procedure Set_Style_Check_Options
(Options : String;
OK : out Boolean;
Err_Col : out Natural);
-- This procedure is called to set the style check options that correspond
-- to the characters in the given Options string. If all options are valid,
-- they are set in an additive manner: any previous options are retained
-- unless overridden, unless a minus is encountered, and then subsequent
-- style switches are subtracted from the current set.
--
-- If all options given are valid, then OK is True, Err_Col is set to
-- Options'Last + 1, and Style_Msg_Buf/Style_Msg_Len are unchanged.
--
-- If an invalid character is found, then OK is False on exit, and Err_Col
-- is the index in options of the bad character. In this case Style_Msg_Len
-- is set and Style_Msg_Buf (1 .. Style_Msg_Len) has a detailed message
-- describing the error.
procedure Set_Style_Check_Options (Options : String);
-- Like the above procedure, but used when the Options string is known to
-- be valid. This is for example appropriate for calls where the string was
-- obtained by Save_Style_Check_Options.
procedure Reset_Style_Check_Options;
-- Sets all style check options to off
subtype Style_Check_Options is String (1 .. 64);
-- Long enough string to hold all options from Save call below
procedure Save_Style_Check_Options (Options : out Style_Check_Options);
-- Sets Options to represent current selection of options. This set can be
-- restored by first calling Reset_Style_Check_Options, and then calling
-- Set_Style_Check_Options with the Options string.
end Stylesw;
|