gcc/ada/style.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                                S T Y L E                                 --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2009, 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
  31 with Errout;
  32 with Styleg;
  33 with Types;    use Types;
  34
  35 package 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_Pragma_Name
 159      renames Style_Inst.Check_Pragma_Name;
 160    --  The current token is a pragma identifier. Check that it is spelled
 161    --  properly (i.e. with an appropriate casing convention).
 162
 163    procedure Check_Right_Paren
 164      renames Style_Inst.Check_Right_Paren;
 165    --  Called after scanning out a right parenthesis to check spacing
 166
 167    procedure Check_Semicolon
 168      renames Style_Inst.Check_Semicolon;
 169    --  Called after scanning out a semicolon to check spacing
 170
 171    procedure Check_Then (If_Loc : Source_Ptr)
 172      renames Style_Inst.Check_Then;
 173    --  Called to check that THEN and IF keywords are appropriately positioned.
 174    --  The parameters show the first characters of the two keywords. This
 175    --  procedure is called only if THEN appears at the start of a line with
 176    --  Token_Ptr pointing to the THEN keyword.
 177
 178    procedure Check_Unary_Plus_Or_Minus
 179      renames Style_Inst.Check_Unary_Plus_Or_Minus;
 180    --  Called after scanning a unary plus or minus to check spacing
 181
 182    procedure Check_Vertical_Bar
 183      renames Style_Inst.Check_Vertical_Bar;
 184    --  Called after scanning a vertical bar to check spacing
 185
 186    procedure Check_Xtra_Parens (Loc : Source_Ptr)
 187      renames Style_Inst.Check_Xtra_Parens;
 188    --  Called after scanning a conditional expression that has at least one
 189    --  level of parentheses around the entire expression.
 190
 191    function Mode_In_Check return Boolean
 192      renames Style_Inst.Mode_In_Check;
 193    --  Determines whether style checking is active and the Mode_In_Check is
 194    --  set, forbidding the explicit use of mode IN.
 195
 196    procedure No_End_Name (Name : Node_Id)
 197      renames Style_Inst.No_End_Name;
 198    --  Called if an END is encountered where a name is allowed but not present.
 199    --  The parameter is the node whose name is the name that is permitted in
 200    --  the END line, and the scan pointer is positioned so that if an error
 201    --  message is to be generated in this situation, it should be generated
 202    --  using Error_Msg_SP.
 203
 204    procedure No_Exit_Name (Name : Node_Id)
 205      renames Style_Inst.No_Exit_Name;
 206    --  Called when exiting a named loop, but a name is not present on the EXIT.
 207    --  The parameter is the node whose name should have followed EXIT, and the
 208    --  scan pointer is positioned so that if an error message is to be
 209    --  generated, it should be generated using Error_Msg_SP.
 210
 211    procedure Non_Lower_Case_Keyword
 212      renames Style_Inst.Non_Lower_Case_Keyword;
 213    --  Called if a reserved keyword is scanned which is not spelled in all
 214    --  lower case letters. On entry Token_Ptr points to the keyword token.
 215    --  This is not used for keywords appearing as attribute designators,
 216    --  where instead Check_Attribute_Name (True) is called.
 217 end Style;