Move Compress::Raw::Zlib from ext/ to cpan/
[perl.git] / genpacksizetables.pl
1 #!/usr/bin/perl -w
2 # I'm assuming that you're running this on some kind of ASCII system, but
3 # it will generate EDCDIC too. (TODO)
4 use strict;
5 use Encode;
6
7 sub make_text {
8     my ($chrmap, $letter, $unpredictable, $nocsum, $size, $condition) = @_;
9     my $text = "    /* $letter */ $size";
10     $text .= " | PACK_SIZE_UNPREDICTABLE" if $unpredictable;
11     $text .= " | PACK_SIZE_CANNOT_CSUM"   if $nocsum;
12     $text .= ",";
13
14     if ($condition) {
15         $condition = join " && ", map {"defined($_)"} split ' ', $condition;
16         $text = "#if $condition
17 $text
18 #else
19     0,
20 #endif";
21     }
22     return $text;
23 }
24
25 sub make_tables {
26     my %arrays;
27
28     my $chrmap = shift;
29     foreach (@_) {
30         my ($letter, $shriek, $unpredictable, $nocsum, $size, $condition) =
31             /^([A-Za-z])(!?)\t(\S*)\t(\S*)\t([^\t\n]+)(?:\t+(.*))?$/ or
32             die "Can't parse '$_'";
33
34         $size = "sizeof($size)" unless $size =~ s/^=//;
35
36         $arrays{$shriek ? 'shrieking' : 'normal'}{ord $chrmap->{$letter}} =
37             make_text($chrmap, $letter,
38                       $unpredictable, $nocsum, $size, $condition);
39     }
40
41     my $text = "STATIC const packprops_t packprops[512] = {\n";
42     foreach my $arrayname (qw(normal shrieking)) {
43         my $array = $arrays{$arrayname} ||
44             die "No defined entries in $arrayname";
45         $text .= "    /* $arrayname */\n";
46         for my $ch (0..255) {
47             $text .= $array->{$ch} || "    0,";
48             $text .= "\n";
49         }
50     }
51     # Join "0," entries together
52     1 while $text =~ s/\b0,\s*\n\s*0,/0, 0,/g;
53     # But split them up again if the sequence gets too long
54     $text =~ s/((?:\b0, ){15}0,) /$1\n    /g;
55     # Clean up final ,
56     $text =~ s/,$//;
57     $text .= "};";
58     return $text;
59 }
60
61 my @lines = grep {
62     s/#.*//;
63     /\S/;
64 } <DATA>;
65
66 my %asciimap  = map {chr $_, chr $_} 0..255;
67 my %ebcdicmap = map {chr $_, Encode::encode("posix-bc", chr $_)} 0..255;
68
69 print <<"EOC";
70 /* These tables are regenerated by genpacksizetables.pl (and then hand pasted
71    in).  You're unlikely ever to need to regenerate them.  */
72
73 #if TYPE_IS_SHRIEKING != 0x100
74    ++++shriek offset should be 256
75 #endif
76
77 typedef U8 packprops_t;
78 #if 'J'-'I' == 1
79 /* ASCII */
80 @{[make_tables (\%asciimap, @lines)]}
81 #else
82 /* EBCDIC (or bust) */
83 @{[make_tables (\%ebcdicmap, @lines)]}
84 #endif
85 EOC
86
87 __DATA__
88 #Symbol unpredictable
89 #               nocsum  size
90 c                       char
91 C       *               unsigned char
92 W       *               unsigned char
93 U       *               char
94 s!                      short
95 s                       =SIZE16
96 S!                      unsigned short
97 v                       =SIZE16
98 n                       =SIZE16
99 S                       =SIZE16
100 v!                      =SIZE16 PERL_PACK_CAN_SHRIEKSIGN
101 n!                      =SIZE16 PERL_PACK_CAN_SHRIEKSIGN
102 i                       int
103 i!                      int
104 I                       unsigned int
105 I!                      unsigned int
106 j                       =IVSIZE
107 J                       =UVSIZE
108 l!                      long
109 l                       =SIZE32
110 L!                      unsigned long
111 V                       =SIZE32
112 N                       =SIZE32
113 V!                      =SIZE32 PERL_PACK_CAN_SHRIEKSIGN
114 N!                      =SIZE32 PERL_PACK_CAN_SHRIEKSIGN
115 L                       =SIZE32
116 p               *       char *
117 w       *       *       char
118 q                       Quad_t  HAS_QUAD
119 Q                       Uquad_t HAS_QUAD
120 f                       float
121 d                       double
122 F                       =NVSIZE
123 D                       =LONG_DOUBLESIZE        HAS_LONG_DOUBLE USE_LONG_DOUBLE