1------------------------------------------------------------------------------
2--                                                                          --
3--                         GNAT COMPILER COMPONENTS                         --
4--                                                                          --
5--                                S T Y L E                                 --
6--                                                                          --
7--                                 S p e c                                  --
8--                                                                          --
9--          Copyright (C) 1992-2012, 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--  This package collects all the routines used for style checking in the
27--  compiler, as activated by the relevant command line option. These are
28--  gathered in a separate package so that they can more easily be customized.
29--  Calls to these subprograms are only made if Opt.Style_Check is set True.
30
31with Errout;
32with Styleg;
33with Types;    use Types;
34
35package Style is
36
37   procedure Body_With_No_Spec (N : Node_Id);
38   --  Called where N is a subprogram body node for a subprogram body
39   --  for which no spec was given, i.e. a body acting as its own spec.
40
41   procedure Check_Array_Attribute_Index
42     (N  : Node_Id;
43      E1 : Node_Id;
44      D  : Int);
45   --  Called for an array attribute specifying an index number. N is the
46   --  node for the attribute, and E1 is the index expression (Empty if none
47   --  present). If E1 is present, it is known to be a static integer. D is
48   --  the number of dimensions of the array.
49
50   procedure Check_Identifier
51     (Ref : Node_Or_Entity_Id;
52      Def : Node_Or_Entity_Id);
53   --  Check style of identifier occurrence. Ref is an N_Identifier node whose
54   --  spelling is to be checked against the Chars spelling in identifier node
55   --  Def (which may be either an N_Identifier, or N_Defining_Identifier node)
56
57   procedure Missing_Overriding (N : Node_Id; E : Entity_Id);
58   --  Called where N is the declaration or body of an overriding operation,
59   --  and the node does not have an overriding_indicator.
60
61   procedure Subprogram_Not_In_Alpha_Order (Name : Node_Id);
62   --  Called if Name is the name of a subprogram body in a package body
63   --  that is not in alphabetical order.
64
65   --  Remaining style routines come from instantiation of Styleg
66
67   package Style_Inst is new Styleg
68     (Errout.Error_Msg,
69      Errout.Error_Msg_S,
70      Errout.Error_Msg_SC,
71      Errout.Error_Msg_SP);
72   --  Instantiation of Styleg for compiler use
73
74   procedure Check_Abs_Not
75     renames Style_Inst.Check_Abs_Not;
76   --  Called after scanning an ABS or NOT operator to check spacing
77
78   procedure Check_Apostrophe
79     renames Style_Inst.Check_Apostrophe;
80   --  Called after scanning an apostrophe to check spacing
81
82   procedure Check_Arrow
83     renames Style_Inst.Check_Arrow;
84   --  Called after scanning out an arrow to check spacing
85
86   procedure Check_Attribute_Name (Reserved : Boolean)
87     renames Style_Inst.Check_Attribute_Name;
88   --  The current token is an attribute designator. Check that it is
89   --  capitalized in an appropriate manner. Reserved is set if the attribute
90   --  designator is a reserved word (access, digits, delta or range) to allow
91   --  differing rules for the two cases.
92
93   procedure Check_Boolean_Operator (Node : Node_Id)
94     renames Style_Inst.Check_Boolean_Operator;
95   --  Called after resolving AND or OR node to check short circuit rules
96
97   procedure Check_Box
98     renames Style_Inst.Check_Box;
99   --  Called after scanning out a box to check spacing
100
101   procedure Check_Binary_Operator
102     renames Style_Inst.Check_Binary_Operator;
103   --  Called after scanning out a binary operator other than a plus, minus
104   --  or exponentiation operator. Intended for checking spacing rules.
105
106   procedure Check_Exponentiation_Operator
107     renames Style_Inst.Check_Exponentiation_Operator;
108   --  Called after scanning out an exponentiation operator. Intended for
109   --  checking spacing rules.
110
111   procedure Check_Colon
112     renames Style_Inst.Check_Colon;
113   --  Called after scanning out colon to check spacing
114
115   procedure Check_Colon_Equal
116     renames Style_Inst.Check_Colon_Equal;
117   --  Called after scanning out colon equal to check spacing
118
119   procedure Check_Comma
120     renames Style_Inst.Check_Comma;
121   --  Called after scanning out comma to check spacing
122
123   procedure Check_Comment
124     renames Style_Inst.Check_Comment;
125   --  Called with Scan_Ptr pointing to the first minus sign of a comment.
126   --  Intended for checking any specific rules for comment placement/format.
127
128   procedure Check_Dot_Dot
129     renames Style_Inst.Check_Dot_Dot;
130   --  Called after scanning out dot dot to check spacing
131
132   procedure Check_EOF
133     renames Style_Inst.Check_EOF;
134   --  Called after scanning out end of file mark
135
136   procedure Check_HT
137     renames Style_Inst.Check_HT;
138   --  Called with Scan_Ptr pointing to a horizontal tab character
139
140   procedure Check_Indentation
141     renames Style_Inst.Check_Indentation;
142   --  Called at the start of a new statement or declaration, with Token_Ptr
143   --  pointing to the first token of the statement or declaration. The check
144   --  is that the starting column is appropriate to the indentation rules if
145   --  Token_Ptr is the first token on the line.
146
147   procedure Check_Left_Paren
148     renames Style_Inst.Check_Left_Paren;
149   --  Called after scanning out a left parenthesis to check spacing
150
151   procedure Check_Line_Terminator (Len : Int)
152     renames Style_Inst.Check_Line_Terminator;
153   --  Called with Scan_Ptr pointing to the first line terminator terminating
154   --  the current line, used to check for appropriate line terminator and to
155   --  check the line length (Len is the length of the current line). Note that
156   --  the terminator may be the EOF character.
157
158   procedure Check_Not_In
159     renames Style_Inst.Check_Not_In;
160   --  Called with Scan_Ptr pointing to an IN token, and Prev_Token_Ptr
161   --  pointing to a NOT token. Used to check proper layout of NOT IN.
162
163   procedure Check_Pragma_Name
164     renames Style_Inst.Check_Pragma_Name;
165   --  The current token is a pragma identifier. Check that it is spelled
166   --  properly (i.e. with an appropriate casing convention).
167
168   procedure Check_Right_Paren
169     renames Style_Inst.Check_Right_Paren;
170   --  Called after scanning out a right parenthesis to check spacing
171
172   procedure Check_Semicolon
173     renames Style_Inst.Check_Semicolon;
174   --  Called after scanning out a semicolon to check spacing
175
176   procedure Check_Then (If_Loc : Source_Ptr)
177     renames Style_Inst.Check_Then;
178   --  Called to check that THEN and IF keywords are appropriately positioned.
179   --  The parameters show the first characters of the two keywords. This
180   --  procedure is called only if THEN appears at the start of a line with
181   --  Token_Ptr pointing to the THEN keyword.
182
183   procedure Check_Unary_Plus_Or_Minus
184     renames Style_Inst.Check_Unary_Plus_Or_Minus;
185   --  Called after scanning a unary plus or minus to check spacing
186
187   procedure Check_Vertical_Bar
188     renames Style_Inst.Check_Vertical_Bar;
189   --  Called after scanning a vertical bar to check spacing
190
191   procedure Check_Xtra_Parens (Loc : Source_Ptr)
192     renames Style_Inst.Check_Xtra_Parens;
193   --  Called after scanning an if, case or quantified expression that has at
194   --  least one level of parentheses around the entire expression.
195
196   function Mode_In_Check return Boolean
197     renames Style_Inst.Mode_In_Check;
198   --  Determines whether style checking is active and the Mode_In_Check is
199   --  set, forbidding the explicit use of mode IN.
200
201   procedure No_End_Name (Name : Node_Id)
202     renames Style_Inst.No_End_Name;
203   --  Called if an END is encountered where a name is allowed but not present.
204   --  The parameter is the node whose name is the name that is permitted in
205   --  the END line, and the scan pointer is positioned so that if an error
206   --  message is to be generated in this situation, it should be generated
207   --  using Error_Msg_SP.
208
209   procedure No_Exit_Name (Name : Node_Id)
210     renames Style_Inst.No_Exit_Name;
211   --  Called when exiting a named loop, but a name is not present on the EXIT.
212   --  The parameter is the node whose name should have followed EXIT, and the
213   --  scan pointer is positioned so that if an error message is to be
214   --  generated, it should be generated using Error_Msg_SP.
215
216   procedure Non_Lower_Case_Keyword
217     renames Style_Inst.Non_Lower_Case_Keyword;
218   --  Called if a reserved keyword is scanned which is not spelled in all
219   --  lower case letters. On entry Token_Ptr points to the keyword token.
220   --  This is not used for keywords appearing as attribute designators,
221   --  where instead Check_Attribute_Name (True) is called.
222end Style;
223