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------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- S T Y L E S W --
-- --
-- S p e c --
-- --
-- Copyright (C) 1992-2001, 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 2, 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 COPYING. If not, write --
-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
-- MA 02111-1307, USA. --
-- --
-- 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 active calls to this package.
-- The actual mechanism for setting these switches to other than
-- default values is via the Set_Style_Check_Option procedure or
-- through a call to Set_Default_Style_Check_Options. They should
-- not be set directly in any other manner.
Style_Check_Attribute_Casing : Boolean := False;
-- This can be set True by using the -gnatg or -gnatya switches. 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 -gnatg or -gnatyb switches. If
-- it is True, then spaces at the end of lines are not permitted.
Style_Check_Comments : Boolean := False;
-- This can be set True by using the -gnatg or -gnatyc switches. 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 coment 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
--
-- 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_End_Labels : Boolean := False;
-- This can be set True by using the -gnatg or -gnatye switches. 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 -gnatg or -gnatyf switches. 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 -gnatg or -gnatyh switches. 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 -gnatg or -gnatyi switches. If
-- it is True, then a THEN keyword may not appear on the line that
-- immediately follows the line containing the corresponding IF.
--
-- 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
--
-- are allowed, but
--
-- if X > Y
-- then
--
-- is not allowed.
Style_Check_Indentation : Column_Number range 0 .. 9 := 0;
-- This can be set non-zero by using the -gnatg or -gnatyn (n a digit)
-- switches. 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
-- indentiation value.
Style_Check_Keyword_Casing : Boolean := False;
-- This can be set True by using the -gnatg or -gnatyk switches. 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_Max_Line_Length : Boolean := False;
-- This can be set True by using the -gnatg or -gnatym switches. If
-- it is True, it activates checking for a maximum line length of 79
-- characters (chosen to fit in standard 80 column displays that don't
-- handle the limiting case of 80 characters cleanly).
Style_Check_Pragma_Casing : Boolean := False;
-- This can be set True by using the -gnatg or -gnatyp switches. If
-- it is True, then pragma names must use mixed case.
Style_Check_Layout : Boolean := False;
-- This can be set True by using the -gnatg or -gnatyl switches. 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_References : Boolean := False;
-- This can be set True by using the -gnatg or -gnatyr switches. 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_Specs : Boolean := False;
-- This can be set True by using the -gnatg or -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 -gnatg or -gnatyn switches. If
-- it is True, then any references to names in Standard have to be
-- in mixed case mode (e.g. Integer, Boolean).
Style_Check_Tokens : Boolean := False;
-- This can be set True by using the -gnatg or -gnatyt switches. 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
--
-- 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_Subprogram_Order : Boolean := False;
-- This can be set True by using the -gnatg or -gnatyo switch. If it
-- is True, then names of subprogram bodies must be in alphabetical
-- order (not taking casing into account).
Style_Max_Line_Length : Int := 79;
-- Value used to check maximum line length. Can be reset by a call to
-- Set_Max_Line_Length. The value here is the default if no such call.
-----------------
-- Subprograms --
-----------------
procedure Set_Default_Style_Check_Options;
-- This procedure is called to set the default style checking options
-- in response to a -gnatg switch or -gnaty with no suboptions.
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. If any
-- invalid character is found, then OK is False on exit, and
-- Err_Col is the index in options of the bad character. If all
-- options are valid, OK is True on return, and Err_Col is set
-- to Options'Last + 1.
procedure Set_Style_Check_Options (Options : String);
-- Like the above procedure, except that the call is simply ignored if
-- there are any error conditions, this is for example appopriate for
-- calls where the string is known to be valid, e.g. because it 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 .. 32);
-- 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;
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