|
111
|
1 ------------------------------------------------------------------------------
|
|
|
2 -- --
|
|
|
3 -- GNAT COMPILER COMPONENTS --
|
|
|
4 -- --
|
|
|
5 -- K R U N C H --
|
|
|
6 -- --
|
|
|
7 -- S p e c --
|
|
|
8 -- --
|
|
145
|
9 -- Copyright (C) 1992-2019, Free Software Foundation, Inc. --
|
|
111
|
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. --
|
|
|
17 -- --
|
|
|
18 -- As a special exception under Section 7 of GPL version 3, you are granted --
|
|
|
19 -- additional permissions described in the GCC Runtime Library Exception, --
|
|
|
20 -- version 3.1, as published by the Free Software Foundation. --
|
|
|
21 -- --
|
|
|
22 -- You should have received a copy of the GNU General Public License and --
|
|
|
23 -- a copy of the GCC Runtime Library Exception along with this program; --
|
|
|
24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
|
|
|
25 -- <http://www.gnu.org/licenses/>. --
|
|
|
26 -- --
|
|
|
27 -- GNAT was originally developed by the GNAT team at New York University. --
|
|
|
28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
|
|
|
29 -- --
|
|
|
30 ------------------------------------------------------------------------------
|
|
|
31
|
|
|
32 -- This procedure implements file name crunching
|
|
|
33
|
|
|
34 -- First, the name is divided into segments separated by minus signs and
|
|
|
35 -- underscores, then all minus signs and underscores are eliminated. If
|
|
|
36 -- this leaves the name short enough, we are done.
|
|
|
37
|
|
|
38 -- If not, then the longest segment is located (left-most if there are
|
|
|
39 -- two of equal length), and shortened by dropping its last character.
|
|
|
40 -- This is repeated until the name is short enough.
|
|
|
41
|
|
|
42 -- As an example, consider the krunch of our-strings-wide_fixed.adb
|
|
|
43 -- to fit the name into 8 characters as required by DOS:
|
|
|
44
|
|
|
45 -- our-strings-wide_fixed 22
|
|
|
46 -- our strings wide fixed 19
|
|
|
47 -- our string wide fixed 18
|
|
|
48 -- our strin wide fixed 17
|
|
|
49 -- our stri wide fixed 16
|
|
|
50 -- our stri wide fixe 15
|
|
|
51 -- our str wide fixe 14
|
|
|
52 -- our str wid fixe 13
|
|
|
53 -- our str wid fix 12
|
|
|
54 -- ou str wid fix 11
|
|
|
55 -- ou st wid fix 10
|
|
|
56 -- ou st wi fix 9
|
|
|
57 -- ou st wi fi 8
|
|
|
58
|
|
|
59 -- Final file name: OUSTWIFX.ADB
|
|
|
60
|
|
|
61 -- A special rule applies for children of System, Ada, Gnat, and Interfaces.
|
|
|
62 -- In these cases, the following special prefix replacements occur:
|
|
|
63
|
|
|
64 -- ada- replaced by a-
|
|
|
65 -- gnat- replaced by g-
|
|
|
66 -- interfaces- replaced by i-
|
|
|
67 -- system- replaced by s-
|
|
|
68
|
|
|
69 -- The rest of the name is krunched in the usual manner described above.
|
|
|
70 -- In addition, these names, as well as the names of the renamed packages
|
|
|
71 -- from the obsolescent features annex, are always krunched to 8 characters
|
|
|
72 -- regardless of the setting of Maxlen.
|
|
|
73
|
|
|
74 -- As an example of this special rule, consider ada-strings-wide_fixed.adb
|
|
|
75 -- which gets krunched as follows:
|
|
|
76
|
|
|
77 -- ada-strings-wide_fixed 22
|
|
|
78 -- a- strings wide fixed 18
|
|
|
79 -- a- string wide fixed 17
|
|
|
80 -- a- strin wide fixed 16
|
|
|
81 -- a- stri wide fixed 15
|
|
|
82 -- a- stri wide fixe 14
|
|
|
83 -- a- str wide fixe 13
|
|
|
84 -- a- str wid fixe 12
|
|
|
85 -- a- str wid fix 11
|
|
|
86 -- a- st wid fix 10
|
|
|
87 -- a- st wi fix 9
|
|
|
88 -- a- st wi fi 8
|
|
|
89
|
|
|
90 -- Final file name: A-STWIFX.ADB
|
|
|
91
|
|
|
92 -- Since children of units named A, G, I or S might conflict with the names
|
|
|
93 -- of predefined units, the naming rule in that case is that the first hyphen
|
|
|
94 -- is replaced by a tilde sign.
|
|
|
95
|
|
|
96 -- Note: as described below, this special treatment of predefined library
|
|
|
97 -- unit file names can be inhibited by setting the No_Predef flag.
|
|
|
98
|
|
|
99 -- Of course there is no guarantee that this algorithm results in uniquely
|
|
|
100 -- crunched names (nor, obviously, is there any algorithm which would do so)
|
|
|
101 -- In fact we run into such a case in the standard library routines with
|
|
|
102 -- children of Wide_Text_IO, so a special rule is applied to deal with this
|
|
|
103 -- clash, namely the prefix ada-wide_text_io- is replaced by a-wt- and then
|
|
|
104 -- the normal crunching rules are applied, so that for example, the unit:
|
|
|
105
|
|
|
106 -- Ada.Wide_Text_IO.Float_IO
|
|
|
107
|
|
|
108 -- has the file name
|
|
|
109
|
|
|
110 -- a-wtflio
|
|
|
111
|
|
|
112 -- More problems arise with Wide_Wide, so we replace this sequence by
|
|
|
113 -- a z (which is not used much) and also (as in the Wide_Text_IO case),
|
|
|
114 -- we replace the prefix ada.wide_wide_text_io- by a-zt- and then
|
|
|
115 -- the normal crunching rules are applied.
|
|
|
116
|
|
|
117 -- These are the only irregularity required (so far) to keep the file names
|
|
|
118 -- unique in the standard predefined libraries.
|
|
|
119
|
|
|
120 procedure Krunch
|
|
|
121 (Buffer : in out String;
|
|
|
122 Len : in out Natural;
|
|
|
123 Maxlen : Natural;
|
|
|
124 No_Predef : Boolean);
|
|
|
125 pragma Elaborate_Body (Krunch);
|
|
|
126 -- The full file name is stored in Buffer (1 .. Len) on entry. The file
|
|
|
127 -- name is crunched in place and on return Len is updated, so that the
|
|
|
128 -- resulting krunched name is in Buffer (1 .. Len) where Len <= Maxlen.
|
|
|
129 -- Note that Len may be less than or equal to Maxlen on entry, in which
|
|
|
130 -- case it may be possible that Krunch does not modify Buffer. The fourth
|
|
|
131 -- parameter, No_Predef, is a switch which, if set to True, disables the
|
|
|
132 -- normal special treatment of predefined library unit file names.
|
|
|
133 --
|
|
|
134 -- Note: the string Buffer must have a lower bound of 1, and may not
|
|
|
135 -- contain any blanks (in particular, it must not have leading blanks).
|
