1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2011, Free Software Foundation, Inc. --
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. --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
24 ------------------------------------------------------------------------------
26 -- This package contains the style switches used for setting style options.
27 -- The only clients of this package are the body of Style and the body of
28 -- Switches. All other style checking issues are handled using the public
29 -- interfaces in the spec of Style.
31 with Types; use Types;
35 --------------------------
36 -- Style Check Switches --
37 --------------------------
39 -- These flags are used to control the details of the style checking
40 -- options. The default values shown here correspond to no style checking.
42 -- If any of these values is set to a non-default value, then
43 -- Opt.Style_Check is set True to activate calls to this package.
45 -- The actual mechanism for setting these switches to other than default
46 -- values is via the Set_Style_Check_Options procedure or through a call to
47 -- Set_Default_Style_Check_Options. They should not be set directly in any
50 Style_Check_Array_Attribute_Index : Boolean := False;
51 -- This can be set True by using the -gnatyA switch. If it is True then
52 -- index numbers for array attributes (like Length) are required to be
53 -- absent for one-dimensional arrays and present for multi-dimensional
54 -- array attribute references.
56 Style_Check_Attribute_Casing : Boolean := False;
57 -- This can be set True by using the -gnatya switch. If it is True, then
58 -- attribute names (including keywords such as digits used as attribute
59 -- names) must be in mixed case.
61 Style_Check_Blanks_At_End : Boolean := False;
62 -- This can be set True by using the -gnatyb switch. If it is True, then
63 -- spaces at the end of lines are not permitted.
65 Style_Check_Blank_Lines : Boolean := False;
66 -- This can be set True by using the -gnatyu switch. If it is True, then
67 -- multiple blank lines are not permitted, and there may not be a blank
68 -- line at the end of the file.
70 Style_Check_Boolean_And_Or : Boolean := False;
71 -- This can be set True by using the -gnatyB switch. If it is True, then
72 -- the use of AND THEN/OR ELSE rather than AND/OR is required except for
73 -- the following cases:
75 -- a) Both operands are simple Boolean constants or variables
76 -- b) Both operands are of a modular type
77 -- c) Both operands are of an array type
79 Style_Check_Comments : Boolean := False;
80 -- This can be set True by using the -gnatyc switch. If it is True, then
81 -- comments are style checked as follows:
83 -- All comments must be at the start of the line, or the first minus must
84 -- be preceded by at least one space.
86 -- For a comment that is not at the start of a line, the only requirement
87 -- is that a space follow the comment characters.
89 -- For a comment that is at the start of the line, one of the following
90 -- conditions must hold:
92 -- The comment characters are the only non-blank characters on the line
94 -- The comment characters are followed by an exclamation point (the
95 -- sequence --! is used by gnatprep for marking deleted lines).
97 -- The comment characters are followed by two space characters if
98 -- Comment_Spacing = 2, else by one character if Comment_Spacing = 1.
100 -- The line consists entirely of minus signs
102 -- The comment characters are followed by a single space, and the last
103 -- two characters on the line are also comment characters.
105 -- Note: the reason for the last two conditions is to allow "boxed"
106 -- comments where only a single space separates the comment characters.
108 Style_Check_Comments_Spacing : Nat range 1 .. 2;
109 -- Spacing required for comments, valid only if Style_Check_Comments true.
111 Style_Check_DOS_Line_Terminator : Boolean := False;
112 -- This can be set true by using the -gnatyd switch. If it is True, then
113 -- the line terminator must be a single LF, without an associated CR (e.g.
114 -- DOS line terminator sequence CR/LF not allowed).
116 Style_Check_End_Labels : Boolean := False;
117 -- This can be set True by using the -gnatye switch. If it is True, then
118 -- optional END labels must always be present.
120 Style_Check_Form_Feeds : Boolean := False;
121 -- This can be set True by using the -gnatyf switch. If it is True, then
122 -- form feeds and vertical tabs are not allowed in the source text.
124 Style_Check_Horizontal_Tabs : Boolean := False;
125 -- This can be set True by using the -gnatyh switch. If it is True, then
126 -- horizontal tabs are not allowed in source text.
128 Style_Check_If_Then_Layout : Boolean := False;
129 -- This can be set True by using the -gnatyi switch. If it is True, then a
130 -- THEN keyword may not appear on the line that immediately follows the
131 -- line containing the corresponding IF.
133 -- This permits one of two styles for IF-THEN layout. Either the IF and
134 -- THEN keywords are on the same line, where the condition is short enough,
135 -- or the conditions are continued over to the lines following the IF and
136 -- the THEN stands on its own. For example:
151 Style_Check_Indentation : Column_Number range 0 .. 9 := 0;
152 -- This can be set non-zero by using the -gnatyn (n a digit) switch. If
153 -- it is non-zero it activates indentation checking with the indicated
154 -- indentation value. A value of zero turns off checking. The requirement
155 -- is that any new statement, line comment, declaration or keyword such
156 -- as END, start on a column that is a multiple of the indentation value.
158 Style_Check_Keyword_Casing : Boolean := False;
159 -- This can be set True by using the -gnatyk switch. If it is True, then
160 -- keywords are required to be in all lower case. This rule does not apply
161 -- to keywords such as digits appearing as an attribute name.
163 Style_Check_Layout : Boolean := False;
164 -- This can be set True by using the -gnatyl switch. If it is True, it
165 -- activates checks that constructs are indented as suggested by the
166 -- examples in the RM syntax, e.g. that the ELSE keyword must line up
167 -- with the IF keyword.
169 Style_Check_Max_Line_Length : Boolean := False;
170 -- This can be set True by using the -gnatym/M switches. If it is True, it
171 -- activates checking for a maximum line length of Style_Max_Line_Length
174 Style_Check_Max_Nesting_Level : Boolean := False;
175 -- This can be set True by using -gnatyLnnn with a value other than zero
176 -- (a value of zero resets it to False). If True, it activates checking
177 -- the maximum nesting level against Style_Max_Nesting_Level.
179 Style_Check_Missing_Overriding : Boolean := False;
180 -- This can be set True by using the -gnatyO switch. If it is True, then
181 -- "overriding" is required in subprogram declarations and bodies where
182 -- appropriate. Note that "not overriding" is never required.
184 Style_Check_Mode_In : Boolean := False;
185 -- This can be set True by using -gnatyI. If True, it activates checking
186 -- that mode IN is not used on its own (since it is the default).
188 Style_Check_Order_Subprograms : Boolean := False;
189 -- This can be set True by using the -gnatyo switch. If it is True, then
190 -- names of subprogram bodies must be in alphabetical order (not taking
191 -- casing into account).
193 Style_Check_Pragma_Casing : Boolean := False;
194 -- This can be set True by using the -gnatyp switch. If it is True, then
195 -- pragma names must use mixed case.
197 Style_Check_References : Boolean := False;
198 -- This can be set True by using the -gnatyr switch. If it is True, then
199 -- all references to declared identifiers are checked. The requirement
200 -- is that casing of the reference be the same as the casing of the
201 -- corresponding declaration.
203 Style_Check_Separate_Stmt_Lines : Boolean := False;
204 -- This can be set True by using the -gnatyS switch. If it is TRUE,
205 -- then for the case of keywords THEN (not preceded by AND) or ELSE (not
206 -- preceded by OR) which introduce a conditionally executed statement
207 -- sequence, there must be no tokens on the same line as the keyword, so
208 -- that coverage testing can clearly identify execution of the statement
209 -- sequence. A comment is permitted, as is THEN ABORT or a PRAGMA keyword
210 -- after ELSE (a common style to specify the condition for the ELSE).
212 Style_Check_Specs : Boolean := False;
213 -- This can be set True by using the -gnatys switches. If it is True, then
214 -- separate specs are required to be present for all procedures except
215 -- parameterless library level procedures. The exception means that typical
216 -- main programs do not require separate specs.
218 Style_Check_Standard : Boolean := False;
219 -- This can be set True by using the -gnatyn switch. If it is True, then
220 -- any references to names in Standard have to be in mixed case mode (e.g.
221 -- Integer, Boolean).
223 Style_Check_Tokens : Boolean := False;
224 -- This can be set True by using the -gnatyt switch. If it is True, then
225 -- the style check that requires canonical spacing between various
226 -- punctuation tokens as follows:
228 -- ABS and NOT must be followed by a space
230 -- => must be surrounded by spaces
232 -- <> must be preceded by a space or left paren
234 -- Binary operators other than ** must be surrounded by spaces.
236 -- There is no restriction on the layout of the ** binary operator.
238 -- Colon must be surrounded by spaces
240 -- Colon-equal (assignment) must be surrounded by spaces
242 -- Comma must be the first non-blank character on the line, or be
243 -- immediately preceded by a non-blank character, and must be followed
246 -- A space must precede a left paren following a digit or letter, and a
247 -- right paren must not be followed by a space (it can be at the end of
250 -- A right paren must either be the first non-blank character on a line,
251 -- or it must be preceded by a non-blank character.
253 -- A semicolon must not be preceded by a blank, and must not be followed
254 -- by a non-blank character.
256 -- A unary plus or minus may not be followed by a space
258 -- A vertical bar must be surrounded by spaces
260 -- Note that a requirement that a token be preceded by a space is met by
261 -- placing the token at the start of the line, and similarly a requirement
262 -- that a token be followed by a space is met by placing the token at
263 -- the end of the line. Note that in the case where horizontal tabs are
264 -- permitted, a horizontal tab is acceptable for meeting the requirement
267 Style_Check_Xtra_Parens : Boolean := False;
268 -- This can be set True by using the -gnatyx switch. If true, then it is
269 -- not allowed to enclose entire conditional expressions in parentheses
272 Style_Max_Line_Length : Int := 0;
273 -- Value used to check maximum line length. Gets reset as a result of
274 -- use of -gnatym or -gnatyMnnn switches. This value is only read if
275 -- Style_Check_Max_Line_Length is True.
277 Style_Max_Nesting_Level : Int := 0;
278 -- Value used to check maximum nesting level. Gets reset as a result
279 -- of use of the -gnatyLnnn switch. This value is only read if
280 -- Style_Check_Max_Nesting_Level is True.
286 function RM_Column_Check return Boolean;
287 -- Determines whether style checking is active and the RM column check
288 -- mode is set requiring checking of RM format layout.
290 procedure Set_Default_Style_Check_Options;
291 -- This procedure is called to set the default style checking options in
292 -- response to a -gnaty switch with no suboptions or from -gnatyy.
294 procedure Set_GNAT_Style_Check_Options;
295 -- This procedure is called to set the default style checking options for
296 -- GNAT units (as set by -gnatg or -gnatyg).
298 Style_Msg_Buf : String (1 .. 80);
299 Style_Msg_Len : Natural;
302 procedure Set_Style_Check_Options
305 Err_Col : out Natural);
306 -- This procedure is called to set the style check options that correspond
307 -- to the characters in the given Options string. If all options are valid,
308 -- they are set in an additive manner: any previous options are retained
309 -- unless overridden, unless a minus is encountered, and then subsequent
310 -- style switches are subtracted from the current set.
312 -- If all options given are valid, then OK is True, Err_Col is set to
313 -- Options'Last + 1, and Style_Msg_Buf/Style_Msg_Len are unchanged.
315 -- If an invalid character is found, then OK is False on exit, and Err_Col
316 -- is the index in options of the bad character. In this case Style_Msg_Len
317 -- is set and Style_Msg_Buf (1 .. Style_Msg_Len) has a detailed message
318 -- describing the error.
320 procedure Set_Style_Check_Options (Options : String);
321 -- Like the above procedure, but used when the Options string is known to
322 -- be valid. This is for example appropriate for calls where the string was
323 -- obtained by Save_Style_Check_Options.
325 procedure Reset_Style_Check_Options;
326 -- Sets all style check options to off
328 subtype Style_Check_Options is String (1 .. 64);
329 -- Long enough string to hold all options from Save call below
331 procedure Save_Style_Check_Options (Options : out Style_Check_Options);
332 -- Sets Options to represent current selection of options. This set can be
333 -- restored by first calling Reset_Style_Check_Options, and then calling
334 -- Set_Style_Check_Options with the Options string.
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