------------------------------------------------------------------------------ -- -- -- GNAT COMPILER COMPONENTS -- -- -- -- S T Y L E S W -- -- -- -- S p e c -- -- -- -- Copyright (C) 1992-2004, 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/M switches. -- If it is True, it activates checking for a maximum line length of -- Style_Max_Line_Length characters. Style_Check_Max_Nesting_Level : Boolean := False; -- This can be set True by using -gnatyLnnn with a value other than -- zero (a value of zero resets it to False). If True, it activates -- checking the maximum nesting level against Style_Max_Nesting_Level. Style_Check_Order_Subprograms : 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_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_Xtra_Parens : Boolean := False; -- This can be set True by using the -gnatg or -gnatyx switch. If true, -- then it is not allowed to enclose entire conditional expressions -- in parentheses (C style). Style_Max_Line_Length : Int := 0; -- Value used to check maximum line length. Gets reset as a result of -- use of -gnatym or -gnatyMnnn switches (or by use of -gnatg). This -- value is only read if Style_Check_Max_Line_Length is True. Style_Max_Nesting_Level : Int := 0; -- Value used to check maximum nesting level. Gets reset as a result -- of use of the -gnatyLnnn switch. This value is only read if -- Style_Check_Max_Nesting_Level is True. ----------------- -- 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 .. 64); -- 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;