1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
|
------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- G N A T P R E P --
-- --
-- S p e c --
-- --
-- Copyright (C) 1992-2002, 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 program provides a simple preprocessing capability for Ada programs.
-- It is designed for use with GNAT, but is not dependent on any special
-- features of GNAT.
-- To call gnatprep use
-- gnatprep infile outfile [deffile] [-v] [-c] [-b] [-r] [-s] [-u]
-- [-Dsymbol=value]
-- where
-- infile is the full name of the input file, which is an Ada source
-- file containing preprocessor directives.
-- outfile is the full name of the output file, which is an Ada source
-- in standard Ada form. When used with GNAT, this file name will
-- normally have an ads or adb suffix.
-- deffile is the full name of a text file containing definitions of
-- symbols to be referenced by the preprocessor. This argument is
-- optional.
-- The -c switch, causes both preprocessor lines and the lines deleted
-- by preprocessing to be retained in the output source as comments marked
-- with the special string "--! ". This option will result in line numbers
-- being preserved in the output file.
-- The -b switch causes both preprocessor lines and the lines deleted by
-- preprocessing to be replaced by blank lines in the output source file,
-- thus preserving line numbers in the output file.
-- The -r switch causes a Source_Reference pragma to be generated that
-- references the original input file, so that error messages will use
-- the file name of this original file.
-- The -u switch causes gnatprep to treat any undefined symbol that it
-- encounters as having the value False. Otherwise an undefined symbol
-- is a fatal error.
-- The -s switch causes a sorted list of symbol names and values to be
-- listed on the standard output file.
-- The -v switch causes a Copyright notice to be displayed, and
-- lines containing errors in the input file or the definition file
-- to be displayed before the errors.
-- The -D switch causes symbol 'symbol' to be associated with 'value'.
-- This symbols can then be referenced by the preprocessor. Several
-- -D switches may be specified.
-- Note: if neither -b nor -c is present, then preprocessor lines and
-- deleted lines are completely removed from the output, unless -r is
-- specified, in which case -b is assumed.
-- The definitions file contains lines of the form
-- symbol := value
-- where symbol is an identifier, following normal Ada (case-insensitive)
-- rules for its syntax, and value is one of the following:
-- Empty, corresponding to a null substitution
-- A string literal using normal Ada syntax
-- Any sequence of characters from the set
-- (letters, digits, period, underline)
-- Comment lines may also appear in the definitions file, starting with
-- the usual --, and comments may be added to the definitions lines.
-- The input text may contain preprocessor conditional inclusion lines,
-- and also general symbol substitution sequences.
-- The preprocessor conditional inclusion commands have the form
-- #if <expression> [then]
-- lines
-- #elsif <expression> [then]
-- lines
-- #elsif <expression> [then]
-- lines
-- ...
-- #else
-- lines
-- #end if;
--
-- Where expression is defined by the following grammar :
-- expression ::= <symbol>
-- expression ::= <symbol> = "<value>"
-- expression ::= <symbol> = <symbol>
-- expression ::= <symbol> 'Defined
-- expression ::= not <expression>
-- expression ::= <expression> and <expression>
-- expression ::= <expression> or <expression>
-- expression ::= <expression> and then <expression>
-- expression ::= <expression> or else <expression>
-- expression ::= ( <expression> )
-- "or" and "and" may not be used in the same expression without
-- using parentheses.
-- For these Boolean tests, the symbol must have either the value True or
-- False. If the value is True, then the corresponding lines are included,
-- and if the value is False, they are excluded. It is an error to
-- reference a symbol not defined in the symbol definitions file, or
-- to reference a symbol that has a value other than True or False.
-- The use of the not operator inverts the sense of this logical test, so
-- that the lines are included only if the symbol is not defined.
-- The THEN keyword is optional as shown
-- Spaces or tabs may appear between the # and the keyword. The keywords
-- and the symbols are case insensitive as in normal Ada code. Comments
-- may be used on a preprocessor line, but other than that, no other
-- tokens may appear on a preprocessor line.
-- Any number of #elsif clauses can be present, including none at all.
-- The #else is optional, as in Ada.
-- The # marking the start of a preprocessor line must be the first
-- non-blank character on the line, i.e. it must be preceded only by
-- spaces or horizontal tabs.
-- Symbol substitution is obtained by using the sequence
-- $symbol
-- anywhere within a source line, except in a comment. The identifier
-- following the $ must match one of the symbols defined in the symbol
-- definition file, and the result is to substitute the value of the
-- symbol in place of $symbol in the output file.
procedure GNATprep;
|
