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4bc3dcfa KW |
1 | use v5.16.0; |
2 | use strict; | |
3 | use warnings; | |
4 | require 'regen/regen_lib.pl'; | |
5 | require 'regen/charset_translations.pl'; | |
6 | ||
7 | # Generates the EBCDIC translation tables that were formerly hard-coded into | |
8 | # utfebcdic.h | |
9 | ||
10 | my $out_fh = open_new('ebcdic_tables.h', '>', | |
11 | {style => '*', by => $0, }); | |
12 | ||
13 | sub output_table ($$) { | |
14 | my $table_ref = shift; | |
15 | my $name = shift; | |
16 | ||
17 | die "Requres 256 entries in table $name, got @$table_ref" if @$table_ref != 256; | |
18 | ||
19 | print $out_fh "EXTCONST U8 $name\[\] = {\n"; | |
20 | ||
21 | for my $i (0 .. 255) { | |
22 | printf $out_fh "%4d", $table_ref->[$i]; | |
23 | #printf $out_fh " 0x%02X", $table_ref->[$i]; | |
24 | print $out_fh ",", if $i < 255; | |
25 | print $out_fh "\n" if $i % 16 == 15; | |
26 | } | |
27 | print $out_fh "};\n\n"; | |
28 | } | |
29 | ||
30 | print $out_fh <<END; | |
31 | ||
32 | #ifndef H_EBCDIC_TABLES /* Guard against nested #includes */ | |
33 | #define H_EBCDIC_TABLES 1 | |
34 | ||
35 | /* This file contains definitions for various tables used in EBCDIC handling. | |
36 | * More info is in utfebcdic.h */ | |
37 | END | |
38 | ||
39 | my @charsets = get_supported_code_pages(); | |
40 | shift @charsets; # ASCII is the 0th, and we don't deal with that here. | |
41 | foreach my $charset (@charsets) { | |
42 | my @a2e = get_a2n($charset); | |
43 | ||
44 | print $out_fh "\n" . get_conditional_compile_line_start($charset); | |
45 | print $out_fh "\n"; | |
46 | ||
47 | print $out_fh "/* Index is ASCII platform code point; value is $charset equivalent */\n"; | |
48 | output_table(\@a2e, "PL_a2e"); | |
49 | ||
50 | { # Construct the inverse | |
51 | my @e2a; | |
52 | for my $i (0 .. 255) { | |
53 | $e2a[$a2e[$i]] = $i; | |
54 | } | |
55 | print $out_fh "/* Index is $charset code point; value is ASCII platform equivalent */\n"; | |
56 | output_table(\@e2a, "PL_e2a"); | |
57 | } | |
58 | ||
59 | my @i82utf = get_I8_2_utf($charset); | |
60 | print $out_fh <<END; | |
61 | /* (Confusingly named) Index is $charset I8 byte; value is | |
62 | * $charset UTF-EBCDIC equivalent */ | |
63 | END | |
64 | output_table(\@i82utf, "PL_utf2e"); | |
65 | ||
66 | { #Construct the inverse | |
67 | my @utf2i8; | |
68 | for my $i (0 .. 255) { | |
69 | $utf2i8[$i82utf[$i]] = $i; | |
70 | } | |
71 | print $out_fh <<END; | |
72 | /* (Confusingly named) Index is $charset UTF-EBCDIC byte; value is | |
73 | * $charset I8 equivalent */ | |
74 | END | |
75 | output_table(\@utf2i8, "PL_e2utf"); | |
76 | } | |
77 | ||
78 | { | |
79 | my @utf8skip; | |
80 | ||
81 | # These are invariants or continuation bytes. | |
82 | for my $i (0 .. 0xBF) { | |
83 | $utf8skip[$i82utf[$i]] = 1; | |
84 | } | |
85 | ||
86 | # These are start bytes; The skip is the number of consecutive highest | |
87 | # order 1-bits (up to 7) | |
88 | for my $i (0xC0 .. 255) { | |
89 | my $count; | |
90 | if (($i & 0b11111110) == 0b11111110) { | |
91 | $count= 7; | |
92 | } | |
93 | elsif (($i & 0b11111100) == 0b11111100) { | |
94 | $count= 6; | |
95 | } | |
96 | elsif (($i & 0b11111000) == 0b11111000) { | |
97 | $count= 5; | |
98 | } | |
99 | elsif (($i & 0b11110000) == 0b11110000) { | |
100 | $count= 4; | |
101 | } | |
102 | elsif (($i & 0b11100000) == 0b11100000) { | |
103 | $count= 3; | |
104 | } | |
105 | elsif (($i & 0b11000000) == 0b11000000) { | |
106 | $count= 2; | |
107 | } | |
108 | else { | |
109 | die "Something wrong for UTF8SKIP calculation for $i"; | |
110 | } | |
111 | $utf8skip[$i82utf[$i]] = $count; | |
112 | } | |
113 | ||
114 | print $out_fh <<END; | |
115 | /* Index is $charset UTF-EBCDIC byte; value is UTF8SKIP for start bytes; | |
116 | * 1 for continuation. Adapted from the shadow flags table in tr16. The | |
117 | * entries marked 9 in tr16 are continuation bytes and are marked as length 1 | |
118 | * here so that we can recover. */ | |
119 | END | |
120 | output_table(\@utf8skip, "PL_utf8skip"); | |
121 | } | |
122 | ||
123 | use feature 'unicode_strings'; | |
124 | ||
125 | { | |
126 | my @lc; | |
127 | for my $i (0 .. 255) { | |
128 | $lc[$a2e[$i]] = $a2e[ord lc chr $i]; | |
129 | } | |
130 | print $out_fh "/* Index is $charset code point; value is its lowercase equivalent */\n"; | |
131 | output_table(\@lc, "PL_latin1_lc"); | |
132 | } | |
133 | ||
134 | { | |
135 | my @uc; | |
136 | for my $i (0 .. 255) { | |
137 | my $uc = uc chr $i; | |
138 | if (length $uc > 1 || ord $uc > 255) { | |
139 | $uc = "\N{LATIN SMALL LETTER Y WITH DIAERESIS}"; | |
140 | } | |
141 | $uc[$a2e[$i]] = $a2e[ord $uc]; | |
142 | } | |
143 | print $out_fh <<END; | |
144 | /* Index is $charset code point; value is its uppercase equivalent. | |
145 | * The 'mod' in the name means that codepoints whose uppercase is above 255 or | |
146 | * longer than 1 character map to LATIN SMALL LETTER Y WITH DIARESIS */ | |
147 | END | |
148 | output_table(\@uc, "PL_mod_latin1_uc"); | |
149 | } | |
150 | ||
151 | { # PL_fold | |
152 | my @ascii_fold; | |
153 | for my $i (0 .. 255) { # Initialise to identity map | |
154 | $ascii_fold[$i] = $i; | |
155 | } | |
156 | ||
157 | # Overwrite the entries that aren't identity | |
158 | for my $chr ('A' .. 'Z') { | |
159 | $ascii_fold[$a2e[ord $chr]] = $a2e[ord lc $chr]; | |
160 | } | |
161 | for my $chr ('a' .. 'z') { | |
162 | $ascii_fold[$a2e[ord $chr]] = $a2e[ord uc $chr]; | |
163 | } | |
164 | print $out_fh <<END; | |
165 | /* Index is $charset code point; For A-Z, value is a-z; for a-z, value | |
166 | * is A-Z; all other code points map to themselves */ | |
167 | END | |
168 | output_table(\@ascii_fold, "PL_fold"); | |
169 | } | |
170 | ||
171 | { | |
172 | my @latin1_fold; | |
173 | for my $i (0 .. 255) { | |
174 | my $char = chr $i; | |
175 | my $lc = lc $char; | |
176 | ||
177 | # lc and uc adequately proxy for fold-case pairs in this 0-255 | |
178 | # range | |
179 | my $uc = uc $char; | |
180 | $uc = $char if length $uc > 1 || ord $uc > 255; | |
181 | if ($lc ne $char) { | |
182 | $latin1_fold[$a2e[$i]] = $a2e[ord $lc]; | |
183 | } | |
184 | elsif ($uc ne $char) { | |
185 | $latin1_fold[$a2e[$i]] = $a2e[ord $uc]; | |
186 | } | |
187 | else { | |
188 | $latin1_fold[$a2e[$i]] = $a2e[$i]; | |
189 | } | |
190 | } | |
191 | print $out_fh <<END; | |
192 | /* Index is $charset code point; value is its other fold-pair equivalent | |
193 | * (A => a; a => A, etc) in the 0-255 range. If no such equivalent, value is | |
194 | * the code point itself */ | |
195 | END | |
196 | output_table(\@latin1_fold, "PL_fold_latin1"); | |
197 | } | |
198 | ||
199 | print $out_fh get_conditional_compile_line_end(); | |
200 | } | |
201 | ||
202 | print $out_fh "\n#endif /* H_EBCDIC_TABLES */\n"; | |
203 | ||
204 | read_only_bottom_close_and_rename($out_fh); |