1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2012, 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 version of the Style package implements the standard GNAT style
27 -- checking rules. For documentation of these rules, see comments on the
28 -- individual procedures.
30 with Atree
; use Atree
;
31 with Casing
; use Casing
;
32 with Csets
; use Csets
;
33 with Einfo
; use Einfo
;
34 with Err_Vars
; use Err_Vars
;
36 with Scans
; use Scans
;
37 with Sinfo
; use Sinfo
;
38 with Sinput
; use Sinput
;
39 with Stylesw
; use Stylesw
;
41 package body Styleg
is
45 Blank_Lines
: Nat
:= 0;
46 -- Counts number of empty lines seen. Reset to zero if a non-empty line
47 -- is encountered. Used to check for trailing blank lines in Check_EOF,
48 -- and for multiple blank lines.
50 Blank_Line_Location
: Source_Ptr
;
51 -- Remembers location of first blank line in a series. Used to issue an
52 -- appropriate diagnostic if subsequent blank lines or the end of file
55 -----------------------
56 -- Local Subprograms --
57 -----------------------
59 procedure Check_No_Space_After
;
60 -- Checks that there is a non-white space character after the current
61 -- token, or white space followed by a comment, or the end of line.
62 -- Issue error message if not.
64 procedure Check_No_Space_Before
;
65 -- Check that token is first token on line, or else is not preceded
66 -- by white space. Signal error of space not allowed if not.
68 procedure Check_Separate_Stmt_Lines_Cont
;
69 -- Non-inlined continuation of Check_Separate_Stmt_Lines
71 function Determine_Token_Casing
return Casing_Type
;
72 -- Determine casing of current token
74 procedure Error_Space_Not_Allowed
(S
: Source_Ptr
);
75 -- Posts an error message indicating that a space is not allowed
76 -- at the given source location.
78 procedure Error_Space_Required
(S
: Source_Ptr
);
79 -- Posts an error message indicating that a space is required at
80 -- the given source location.
82 function Is_White_Space
(C
: Character) return Boolean;
83 pragma Inline
(Is_White_Space
);
84 -- Returns True for space, HT, VT or FF, False otherwise
86 procedure Require_Following_Space
;
87 pragma Inline
(Require_Following_Space
);
88 -- Require token to be followed by white space. Used only if in GNAT
89 -- style checking mode.
91 procedure Require_Preceding_Space
;
92 pragma Inline
(Require_Preceding_Space
);
93 -- Require token to be preceded by white space. Used only if in GNAT
94 -- style checking mode.
96 ----------------------
97 -- Check_Abs_Or_Not --
98 ----------------------
100 -- In check tokens mode (-gnatyt), ABS/NOT must be followed by a space
102 procedure Check_Abs_Not
is
104 if Style_Check_Tokens
then
105 if Source
(Scan_Ptr
) > ' ' then
106 Error_Space_Required
(Scan_Ptr
);
111 ----------------------
112 -- Check_Apostrophe --
113 ----------------------
115 -- Do not allow space before or after apostrophe
117 procedure Check_Apostrophe
is
119 if Style_Check_Tokens
then
120 Check_No_Space_After
;
122 end Check_Apostrophe
;
128 -- In check tokens mode (-gnatys), arrow must be surrounded by spaces
130 procedure Check_Arrow
is
132 if Style_Check_Tokens
then
133 Require_Preceding_Space
;
134 Require_Following_Space
;
138 --------------------------
139 -- Check_Attribute_Name --
140 --------------------------
142 -- In check attribute casing mode (-gnatya), attribute names must be
143 -- mixed case, i.e. start with an upper case letter, and otherwise
144 -- lower case, except after an underline character.
146 procedure Check_Attribute_Name
(Reserved
: Boolean) is
147 pragma Warnings
(Off
, Reserved
);
149 if Style_Check_Attribute_Casing
then
150 if Determine_Token_Casing
/= Mixed_Case
then
151 Error_Msg_SC
-- CODEFIX
152 ("(style) bad capitalization, mixed case required");
155 end Check_Attribute_Name
;
157 ---------------------------
158 -- Check_Binary_Operator --
159 ---------------------------
161 -- In check token mode (-gnatyt), binary operators other than the special
162 -- case of exponentiation require surrounding space characters.
164 procedure Check_Binary_Operator
is
166 if Style_Check_Tokens
then
167 Require_Preceding_Space
;
168 Require_Following_Space
;
170 end Check_Binary_Operator
;
172 ----------------------------
173 -- Check_Boolean_Operator --
174 ----------------------------
176 procedure Check_Boolean_Operator
(Node
: Node_Id
) is
178 function OK_Boolean_Operand
(N
: Node_Id
) return Boolean;
179 -- Returns True for simple variable, or "not X1" or "X1 and X2" or
180 -- "X1 or X2" where X1, X2 are recursively OK_Boolean_Operand's.
182 ------------------------
183 -- OK_Boolean_Operand --
184 ------------------------
186 function OK_Boolean_Operand
(N
: Node_Id
) return Boolean is
188 if Nkind_In
(N
, N_Identifier
, N_Expanded_Name
) then
191 elsif Nkind
(N
) = N_Op_Not
then
192 return OK_Boolean_Operand
(Original_Node
(Right_Opnd
(N
)));
194 elsif Nkind_In
(N
, N_Op_And
, N_Op_Or
) then
195 return OK_Boolean_Operand
(Original_Node
(Left_Opnd
(N
)))
197 OK_Boolean_Operand
(Original_Node
(Right_Opnd
(N
)));
202 end OK_Boolean_Operand
;
204 -- Start of processing for Check_Boolean_Operator
207 if Style_Check_Boolean_And_Or
208 and then Comes_From_Source
(Node
)
211 Orig
: constant Node_Id
:= Original_Node
(Node
);
214 if Nkind_In
(Orig
, N_Op_And
, N_Op_Or
) then
216 L
: constant Node_Id
:= Original_Node
(Left_Opnd
(Orig
));
217 R
: constant Node_Id
:= Original_Node
(Right_Opnd
(Orig
));
220 -- First OK case, simple boolean constants/identifiers
222 if OK_Boolean_Operand
(L
)
224 OK_Boolean_Operand
(R
)
228 -- Second OK case, modular types
230 elsif Is_Modular_Integer_Type
(Etype
(Node
)) then
233 -- Third OK case, array types
235 elsif Is_Array_Type
(Etype
(Node
)) then
238 -- Otherwise we have an error
240 elsif Nkind
(Orig
) = N_Op_And
then
242 ("(style) `AND THEN` required", Sloc
(Orig
));
245 ("(style) `OR ELSE` required", Sloc
(Orig
));
251 end Check_Boolean_Operator
;
257 -- In check token mode (-gnatyt), box must be preceded by a space or by
258 -- a left parenthesis. Spacing checking on the surrounding tokens takes
259 -- care of the remaining checks.
261 procedure Check_Box
is
263 if Style_Check_Tokens
then
264 if Prev_Token
/= Tok_Left_Paren
then
265 Require_Preceding_Space
;
274 -- In check token mode (-gnatyt), colon must be surrounded by spaces
276 procedure Check_Colon
is
278 if Style_Check_Tokens
then
279 Require_Preceding_Space
;
280 Require_Following_Space
;
284 -----------------------
285 -- Check_Colon_Equal --
286 -----------------------
288 -- In check token mode (-gnatyt), := must be surrounded by spaces
290 procedure Check_Colon_Equal
is
292 if Style_Check_Tokens
then
293 Require_Preceding_Space
;
294 Require_Following_Space
;
296 end Check_Colon_Equal
;
302 -- In check token mode (-gnatyt), comma must be either the first
303 -- token on a line, or be preceded by a non-blank character.
304 -- It must also always be followed by a blank.
306 procedure Check_Comma
is
308 if Style_Check_Tokens
then
309 Check_No_Space_Before
;
311 if Source
(Scan_Ptr
) > ' ' then
312 Error_Space_Required
(Scan_Ptr
);
321 -- In check comment mode (-gnatyc) there are several requirements on the
322 -- format of comments. The following are permissible comment formats:
324 -- 1. Any comment that is not at the start of a line, i.e. where the
325 -- initial minuses are not the first non-blank characters on the
326 -- line must have at least one blank after the second minus or a
327 -- special character as defined in rule 5.
329 -- 2. A row of all minuses of any length is permitted (see procedure
330 -- box above in the source of this routine).
332 -- 3. A comment line starting with two minuses and a space, and ending
333 -- with a space and two minuses. Again see the procedure title box
334 -- immediately above in the source.
336 -- 4. A full line comment where two spaces follow the two minus signs.
337 -- This is the normal comment format in GNAT style, as typified by
338 -- the comments you are reading now.
340 -- 5. A full line comment where the first character after the second
341 -- minus is a special character, i.e. a character in the ASCII
342 -- range 16#21#..16#2F# or 16#3A#..16#3F#. This allows special
343 -- comments, such as those generated by gnatprep, or those that
344 -- appear in the SPARK annotation language to be accepted.
346 -- Note: for GNAT internal files (-gnatg switch set on for the
347 -- compilation), the only special sequence recognized and allowed
348 -- is --! as generated by gnatprep.
350 -- 6. In addition, the comment must be properly indented if comment
351 -- indentation checking is active (Style_Check_Indentation non-zero).
352 -- Either the start column must be a multiple of this indentation,
353 -- or the indentation must match that of the next non-blank line.
355 procedure Check_Comment
is
359 function Is_Box_Comment
return Boolean;
360 -- Returns True if the last two characters on the line are -- which
361 -- characterizes a box comment (as for example follows this spec).
363 function Is_Special_Character
(C
: Character) return Boolean;
364 -- Determines if C is a special character (see rule 5 above)
366 function Same_Column_As_Next_Non_Blank_Line
return Boolean;
367 -- Called for a full line comment. If the indentation of this comment
368 -- matches that of the next non-blank line in the source, then True is
369 -- returned, otherwise False.
375 function Is_Box_Comment
return Boolean is
379 -- Do we need to worry about UTF_32 line terminators here ???
382 while Source
(S
) not in Line_Terminator
loop
386 return Source
(S
- 1) = '-' and then Source
(S
- 2) = '-';
389 --------------------------
390 -- Is_Special_Character --
391 --------------------------
393 function Is_Special_Character
(C
: Character) return Boolean is
399 Character'Pos (C
) in 16#
21#
.. 16#
2F#
401 Character'Pos (C
) in 16#
3A#
.. 16#
3F#
;
403 end Is_Special_Character
;
405 ----------------------------------------
406 -- Same_Column_As_Next_Non_Blank_Line --
407 ----------------------------------------
409 function Same_Column_As_Next_Non_Blank_Line
return Boolean is
413 -- Step to end of line
416 while Source
(P
) not in Line_Terminator
loop
420 -- Step past blanks, and line terminators (UTF_32 case???)
422 while Source
(P
) <= ' ' and then Source
(P
) /= EOF
loop
428 return Get_Column_Number
(Scan_Ptr
) = Get_Column_Number
(P
);
429 end Same_Column_As_Next_Non_Blank_Line
;
431 -- Start of processing for Check_Comment
434 -- Can never have a non-blank character preceding the first minus
436 if Style_Check_Comments
then
437 if Scan_Ptr
> Source_First
(Current_Source_File
)
438 and then Source
(Scan_Ptr
- 1) > ' '
440 Error_Msg_S
-- CODEFIX
441 ("(style) space required");
445 -- For a comment that is not at the start of the line, the only
446 -- requirement is that we cannot have a non-blank character after
447 -- the second minus sign or a special character.
449 if Scan_Ptr
/= First_Non_Blank_Location
then
450 if Style_Check_Comments
then
451 if Source
(Scan_Ptr
+ 2) > ' '
452 and then not Is_Special_Character
(Source
(Scan_Ptr
+ 2))
455 ("(style) space required", Scan_Ptr
+ 2);
461 -- Case of a comment that is at the start of a line
464 -- First check, must be in appropriately indented column
466 if Style_Check_Indentation
/= 0 then
467 if Start_Column
rem Style_Check_Indentation
/= 0 then
468 if not Same_Column_As_Next_Non_Blank_Line
then
469 Error_Msg_S
-- CODEFIX
470 ("(style) bad column");
477 -- If we are not checking comments, nothing more to do
479 if not Style_Check_Comments
then
483 -- Case of not followed by a blank. Usually wrong, but there are
484 -- some exceptions that we permit.
486 if Source
(Scan_Ptr
+ 2) /= ' ' then
487 C
:= Source
(Scan_Ptr
+ 2);
489 -- Case of -- all on its own on a line is OK
495 -- Case of --x, x special character is OK (gnatprep/SPARK/etc.)
496 -- This is not permitted in internal GNAT implementation units
497 -- except for the case of --! as used by gnatprep output.
499 if Is_Special_Character
(C
) then
503 -- The only other case in which we allow a character after
504 -- the -- other than a space is when we have a row of minus
505 -- signs (case of header lines for a box comment for example).
508 while Source
(S
) >= ' ' loop
509 if Source
(S
) /= '-' then
511 or else Style_Check_Comments_Spacing
= 1
513 Error_Space_Required
(Scan_Ptr
+ 2);
516 ("(style) two spaces required", Scan_Ptr
+ 2);
525 -- If we are followed by a blank, then the comment is OK if the
526 -- character following this blank is another blank or a format
527 -- effector, or if the required comment spacing is 1.
529 elsif Source
(Scan_Ptr
+ 3) <= ' '
530 or else Style_Check_Comments_Spacing
= 1
534 -- Here is the case where we only have one blank after the two minus
535 -- signs, with Style_Check_Comments_Spacing set to 2, which is an
536 -- error unless the line ends with two minus signs, the case of a
539 elsif not Is_Box_Comment
then
540 Error_Space_Required
(Scan_Ptr
+ 3);
549 -- In check token mode (-gnatyt), colon must be surrounded by spaces
551 procedure Check_Dot_Dot
is
553 if Style_Check_Tokens
then
554 Require_Preceding_Space
;
555 Require_Following_Space
;
563 -- In check blanks at end mode, check no blank lines precede the EOF
565 procedure Check_EOF
is
567 if Style_Check_Blank_Lines
then
569 -- We expect one blank line, from the EOF, but no more than one
571 if Blank_Lines
= 2 then
573 ("(style) blank line not allowed at end of file",
574 Blank_Line_Location
);
576 elsif Blank_Lines
>= 3 then
578 ("(style) blank lines not allowed at end of file",
579 Blank_Line_Location
);
584 -----------------------------------
585 -- Check_Exponentiation_Operator --
586 -----------------------------------
588 -- No spaces are required for the ** operator in GNAT style check mode
590 procedure Check_Exponentiation_Operator
is
593 end Check_Exponentiation_Operator
;
599 -- In check horizontal tab mode (-gnatyh), tab characters are not allowed
601 procedure Check_HT
is
603 if Style_Check_Horizontal_Tabs
then
604 Error_Msg_S
-- CODEFIX
605 ("(style) horizontal tab not allowed");
609 -----------------------
610 -- Check_Indentation --
611 -----------------------
613 -- In check indentation mode (-gnatyn for n a digit), a new statement or
614 -- declaration is required to start in a column that is a multiple of the
615 -- indentation amount.
617 procedure Check_Indentation
is
619 if Style_Check_Indentation
/= 0 then
620 if Token_Ptr
= First_Non_Blank_Location
621 and then Start_Column
rem Style_Check_Indentation
/= 0
623 Error_Msg_SC
-- CODEFIX
624 ("(style) bad indentation");
627 end Check_Indentation
;
629 ----------------------
630 -- Check_Left_Paren --
631 ----------------------
633 -- In tone check mode (-gnatyt), left paren must not be preceded by an
634 -- identifier character or digit (a separating space is required) and
635 -- may never be followed by a space.
637 procedure Check_Left_Paren
is
639 if Style_Check_Tokens
then
640 if Token_Ptr
> Source_First
(Current_Source_File
)
641 and then Identifier_Char
(Source
(Token_Ptr
- 1))
643 Error_Space_Required
(Token_Ptr
);
646 Check_No_Space_After
;
648 end Check_Left_Paren
;
650 ---------------------------
651 -- Check_Line_Max_Length --
652 ---------------------------
654 -- In check max line length mode (-gnatym), the line length must
655 -- not exceed the permitted maximum value.
657 procedure Check_Line_Max_Length
(Len
: Int
) is
659 if Style_Check_Max_Line_Length
then
660 if Len
> Style_Max_Line_Length
then
662 ("(style) this line is too long",
663 Current_Line_Start
+ Source_Ptr
(Style_Max_Line_Length
));
666 end Check_Line_Max_Length
;
668 ---------------------------
669 -- Check_Line_Terminator --
670 ---------------------------
672 -- In check blanks at end mode (-gnatyb), lines may not end with a
675 -- In check form feeds mode (-gnatyf), the line terminator may not
676 -- be either of the characters FF or VT.
678 -- In check DOS line terminators node (-gnatyd), the line terminator
679 -- must be a single LF, without a following CR.
681 procedure Check_Line_Terminator
(Len
: Int
) is
685 -- Length of line (adjusted down for blanks at end of line)
688 -- Reset count of blank lines if first line
690 if Get_Logical_Line_Number
(Scan_Ptr
) = 1 then
694 -- Check FF/VT terminators
696 if Style_Check_Form_Feeds
then
697 if Source
(Scan_Ptr
) = ASCII
.FF
then
698 Error_Msg_S
-- CODEFIX
699 ("(style) form feed not allowed");
700 elsif Source
(Scan_Ptr
) = ASCII
.VT
then
701 Error_Msg_S
-- CODEFIX
702 ("(style) vertical tab not allowed");
706 -- Check DOS line terminator
708 if Style_Check_DOS_Line_Terminator
then
710 -- Ignore EOF, since we only get called with an EOF if it is the last
711 -- character in the buffer (and was therefore not in the source file),
712 -- since the terminating EOF is added to stop the scan.
714 if Source
(Scan_Ptr
) = EOF
then
717 -- Bad terminator if we don't have an LF
719 elsif Source
(Scan_Ptr
) /= LF
then
720 Error_Msg_S
("(style) incorrect line terminator");
724 -- Remove trailing spaces
727 while L
> 0 and then Is_White_Space
(Source
(S
- 1)) loop
732 -- Issue message for blanks at end of line if option enabled
734 if Style_Check_Blanks_At_End
and then L
< Len
then
736 ("(style) trailing spaces not permitted", S
);
739 -- Deal with empty (blank) line
743 -- Increment blank line count
745 Blank_Lines
:= Blank_Lines
+ 1;
747 -- If first blank line, record location for later error message
749 if Blank_Lines
= 1 then
750 Blank_Line_Location
:= Scan_Ptr
;
753 -- Non-blank line, check for previous multiple blank lines
756 if Style_Check_Blank_Lines
and then Blank_Lines
> 1 then
758 ("(style) multiple blank lines", Blank_Line_Location
);
761 -- And reset blank line count
765 end Check_Line_Terminator
;
771 -- In check tokens mode, only one space between NOT and IN
773 procedure Check_Not_In
is
775 if Style_Check_Tokens
then
776 if Source
(Token_Ptr
- 1) /= ' '
777 or else Token_Ptr
- Prev_Token_Ptr
/= 4
780 ("(style) single space must separate NOT and IN", Token_Ptr
- 1);
785 --------------------------
786 -- Check_No_Space_After --
787 --------------------------
789 procedure Check_No_Space_After
is
793 if Is_White_Space
(Source
(Scan_Ptr
)) then
795 -- Allow one or more spaces if followed by comment
799 if Source
(S
) = '-' and then Source
(S
+ 1) = '-' then
802 elsif Is_White_Space
(Source
(S
)) then
810 Error_Space_Not_Allowed
(Scan_Ptr
);
812 end Check_No_Space_After
;
814 ---------------------------
815 -- Check_No_Space_Before --
816 ---------------------------
818 procedure Check_No_Space_Before
is
820 if Token_Ptr
> First_Non_Blank_Location
821 and then Source
(Token_Ptr
- 1) <= ' '
823 Error_Space_Not_Allowed
(Token_Ptr
- 1);
825 end Check_No_Space_Before
;
827 -----------------------
828 -- Check_Pragma_Name --
829 -----------------------
831 -- In check pragma casing mode (-gnatyp), pragma names must be mixed
832 -- case, i.e. start with an upper case letter, and otherwise lower case,
833 -- except after an underline character.
835 procedure Check_Pragma_Name
is
837 if Style_Check_Pragma_Casing
then
838 if Determine_Token_Casing
/= Mixed_Case
then
839 Error_Msg_SC
-- CODEFIX
840 ("(style) bad capitalization, mixed case required");
843 end Check_Pragma_Name
;
845 -----------------------
846 -- Check_Right_Paren --
847 -----------------------
849 -- In check tokens mode (-gnatyt), right paren must not be immediately
850 -- followed by an identifier character, and must never be preceded by
851 -- a space unless it is the initial non-blank character on the line.
853 procedure Check_Right_Paren
is
855 if Style_Check_Tokens
then
856 if Identifier_Char
(Source
(Token_Ptr
+ 1)) then
857 Error_Space_Required
(Token_Ptr
+ 1);
860 Check_No_Space_Before
;
862 end Check_Right_Paren
;
864 ---------------------
865 -- Check_Semicolon --
866 ---------------------
868 -- In check tokens mode (-gnatyt), semicolon does not permit a preceding
869 -- space and a following space is required.
871 procedure Check_Semicolon
is
873 if Style_Check_Tokens
then
874 Check_No_Space_Before
;
876 if Source
(Scan_Ptr
) > ' ' then
877 Error_Space_Required
(Scan_Ptr
);
882 -------------------------------
883 -- Check_Separate_Stmt_Lines --
884 -------------------------------
886 procedure Check_Separate_Stmt_Lines
is
888 if Style_Check_Separate_Stmt_Lines
then
889 Check_Separate_Stmt_Lines_Cont
;
891 end Check_Separate_Stmt_Lines
;
893 ------------------------------------
894 -- Check_Separate_Stmt_Lines_Cont --
895 ------------------------------------
897 procedure Check_Separate_Stmt_Lines_Cont
is
901 -- Skip past white space
904 while Is_White_Space
(Source
(S
)) loop
908 -- Line terminator is OK
910 if Source
(S
) in Line_Terminator
then
915 elsif Source
(S
) = '-' and then Source
(S
+ 1) = '-' then
918 -- ABORT keyword is OK after THEN (THEN ABORT case)
920 elsif Token
= Tok_Then
921 and then (Source
(S
+ 0) = 'a' or else Source
(S
+ 0) = 'A')
922 and then (Source
(S
+ 1) = 'b' or else Source
(S
+ 1) = 'B')
923 and then (Source
(S
+ 2) = 'o' or else Source
(S
+ 2) = 'O')
924 and then (Source
(S
+ 3) = 'r' or else Source
(S
+ 3) = 'R')
925 and then (Source
(S
+ 4) = 't' or else Source
(S
+ 4) = 'T')
926 and then (Source
(S
+ 5) in Line_Terminator
927 or else Is_White_Space
(Source
(S
+ 5)))
931 -- PRAGMA keyword is OK after ELSE
933 elsif Token
= Tok_Else
934 and then (Source
(S
+ 0) = 'p' or else Source
(S
+ 0) = 'P')
935 and then (Source
(S
+ 1) = 'r' or else Source
(S
+ 1) = 'R')
936 and then (Source
(S
+ 2) = 'a' or else Source
(S
+ 2) = 'A')
937 and then (Source
(S
+ 3) = 'g' or else Source
(S
+ 3) = 'G')
938 and then (Source
(S
+ 4) = 'm' or else Source
(S
+ 4) = 'M')
939 and then (Source
(S
+ 5) = 'a' or else Source
(S
+ 5) = 'A')
940 and then (Source
(S
+ 6) in Line_Terminator
941 or else Is_White_Space
(Source
(S
+ 6)))
945 -- Otherwise we have the style violation we are looking for
948 if Token
= Tok_Then
then
950 ("(style) no statements may follow THEN on same line", S
);
953 ("(style) no statements may follow ELSE on same line", S
);
956 end Check_Separate_Stmt_Lines_Cont
;
962 -- In check if then layout mode (-gnatyi), we expect a THEN keyword
963 -- to appear either on the same line as the IF, or on a separate line
964 -- after multiple conditions. In any case, it may not appear on the
965 -- line immediately following the line with the IF.
967 procedure Check_Then
(If_Loc
: Source_Ptr
) is
969 if Style_Check_If_Then_Layout
then
970 if Get_Physical_Line_Number
(Token_Ptr
) =
971 Get_Physical_Line_Number
(If_Loc
) + 1
973 Error_Msg_SC
("(style) misplaced THEN");
978 -------------------------------
979 -- Check_Unary_Plus_Or_Minus --
980 -------------------------------
982 -- In check token mode (-gnatyt), unary plus or minus must not be
983 -- followed by a space.
985 procedure Check_Unary_Plus_Or_Minus
is
987 if Style_Check_Tokens
then
988 Check_No_Space_After
;
990 end Check_Unary_Plus_Or_Minus
;
992 ------------------------
993 -- Check_Vertical_Bar --
994 ------------------------
996 -- In check token mode (-gnatyt), vertical bar must be surrounded by spaces
998 procedure Check_Vertical_Bar
is
1000 if Style_Check_Tokens
then
1001 Require_Preceding_Space
;
1002 Require_Following_Space
;
1004 end Check_Vertical_Bar
;
1006 -----------------------
1007 -- Check_Xtra_Parens --
1008 -----------------------
1010 procedure Check_Xtra_Parens
(Loc
: Source_Ptr
) is
1012 if Style_Check_Xtra_Parens
then
1013 Error_Msg
-- CODEFIX
1014 ("redundant parentheses?", Loc
);
1016 end Check_Xtra_Parens
;
1018 ----------------------------
1019 -- Determine_Token_Casing --
1020 ----------------------------
1022 function Determine_Token_Casing
return Casing_Type
is
1024 return Determine_Casing
(Source
(Token_Ptr
.. Scan_Ptr
- 1));
1025 end Determine_Token_Casing
;
1027 -----------------------------
1028 -- Error_Space_Not_Allowed --
1029 -----------------------------
1031 procedure Error_Space_Not_Allowed
(S
: Source_Ptr
) is
1033 Error_Msg
-- CODEFIX
1034 ("(style) space not allowed", S
);
1035 end Error_Space_Not_Allowed
;
1037 --------------------------
1038 -- Error_Space_Required --
1039 --------------------------
1041 procedure Error_Space_Required
(S
: Source_Ptr
) is
1043 Error_Msg
-- CODEFIX
1044 ("(style) space required", S
);
1045 end Error_Space_Required
;
1047 --------------------
1048 -- Is_White_Space --
1049 --------------------
1051 function Is_White_Space
(C
: Character) return Boolean is
1053 return C
= ' ' or else C
= HT
;
1060 function Mode_In_Check
return Boolean is
1062 return Style_Check
and Style_Check_Mode_In
;
1069 -- In check end/exit labels mode (-gnatye), always require the name of
1070 -- a subprogram or package to be present on the END, so this is an error.
1072 procedure No_End_Name
(Name
: Node_Id
) is
1074 if Style_Check_End_Labels
then
1075 Error_Msg_Node_1
:= Name
;
1076 Error_Msg_SP
-- CODEFIX
1077 ("(style) `END &` required");
1085 -- In check end/exit labels mode (-gnatye), always require the name of
1086 -- the loop to be present on the EXIT when exiting a named loop.
1088 procedure No_Exit_Name
(Name
: Node_Id
) is
1090 if Style_Check_End_Labels
then
1091 Error_Msg_Node_1
:= Name
;
1092 Error_Msg_SP
-- CODEFIX
1093 ("(style) `EXIT &` required");
1097 ----------------------------
1098 -- Non_Lower_Case_Keyword --
1099 ----------------------------
1101 -- In check casing mode (-gnatyk), reserved keywords must be spelled
1102 -- in all lower case (excluding keywords range, access, delta and digits
1103 -- used as attribute designators).
1105 procedure Non_Lower_Case_Keyword
is
1107 if Style_Check_Keyword_Casing
then
1108 Error_Msg_SC
-- CODEFIX
1109 ("(style) reserved words must be all lower case");
1111 end Non_Lower_Case_Keyword
;
1113 -----------------------------
1114 -- Require_Following_Space --
1115 -----------------------------
1117 procedure Require_Following_Space
is
1119 if Source
(Scan_Ptr
) > ' ' then
1120 Error_Space_Required
(Scan_Ptr
);
1122 end Require_Following_Space
;
1124 -----------------------------
1125 -- Require_Preceding_Space --
1126 -----------------------------
1128 procedure Require_Preceding_Space
is
1130 if Token_Ptr
> Source_First
(Current_Source_File
)
1131 and then Source
(Token_Ptr
- 1) > ' '
1133 Error_Space_Required
(Token_Ptr
);
1135 end Require_Preceding_Space
;