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https://github.com/rkd77/elinks.git
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c7602eb744
I had already done this to my other scripts on 2008-09-28 (commit
c67885d880) but missed Unicode/gen-case.
Update it, and list it in COPYING.
(Although Unicode/gen-case is part of the source tree, this version of
ELinks does not use that file for anything.)
125 lines
3.4 KiB
Perl
Executable File
125 lines
3.4 KiB
Perl
Executable File
#! /usr/bin/perl
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use strict;
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use warnings;
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my @trans;
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print "\t/* -*- c -*- source code generated by ", join(" ", $0, @ARGV), " */\n";
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while (<>) {
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s/#.*$//;
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next if /^\s*$/;
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my($code, $status, $mapping) = /^([[:xdigit:]]+);\s*([CFST]);\s*([[:xdigit:]]+(?:\s+[[:xdigit:]]+)*);\s*$/
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or warn("$ARGV:$.: weird line\n"), next;
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next unless $status eq "C" or $status eq "S";
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warn("$ARGV:$.: multi-char simple mapping\n"), next
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if $mapping =~ /\s/;
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$code = hex($code);
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$mapping = hex($mapping);
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$trans[$code] = $mapping;
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} continue {
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close ARGV if eof;
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}
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sub gobble {
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my($begin, $step) = @_;
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my $diff = $trans[$begin] - $begin;
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my @codes;
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my @holes;
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my $probe = $begin;
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my $hole;
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while (1) {
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my @beyond;
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while (defined($trans[$probe]) && $trans[$probe] == $probe + $diff) {
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push @beyond, $probe;
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$probe += $step;
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}
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last unless @beyond >= 2;
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push @holes, $hole if defined $hole;
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push @codes, @beyond;
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$hole = $probe;
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$probe += $step;
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}
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return 0 unless @codes;
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# The following formula was tuned for i486-linux-gnu-gcc-4.0 -O1.
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if (@codes <= 2 + @holes) {
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print "if (", join(" || ", map { sprintf("c == 0x%X", $_) } @codes), ")\n";
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} else {
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printf "if (c >= 0x%X && c <= 0x%X", $codes[0], $codes[-1];
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printf " && c != 0x%X", $_ foreach @holes;
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if ($step == 2) { printf " && (c & 1) == %d", $begin & 1 }
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elsif ($step != 1) { printf " && c %% %d == %d", $step, $begin % $step }
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print ")\n";
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}
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if ($diff != 0) {
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if ($diff < 0) { printf "\t\tc -= "; $diff = -$diff }
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else { printf "\t\tc += " }
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if ($diff < 10) { printf "%d", $diff }
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else { printf "0x%X", $diff }
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}
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print ";\n";
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undef $trans[$_] foreach @codes;
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return 1;
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}
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my $first = 1;
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for (my $code = 0; $code <= $#trans; ++$code) {
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next unless defined $trans[$code];
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print $first ? "\t" : "\telse ";
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gobble($code, 1) or gobble($code, 2) or gobble($code, 3) or gobble($code, 4)
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or printf "if (c == 0x%X)\n\t\tc = 0x%X;\n", $code, $trans[$code];
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$first = 0;
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}
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close STDOUT or die "$0: -: $!\n";
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__END__
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=head1 NAME
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gen-case - Generate C source code for folding the case of a Unicode character.
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=head1 SYNOPSIS
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B<gen-case> CaseFolding.txt > ../src/intl/casefold.inc
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=head1 DESCRIPTION
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B<gen-case> reads F<CaseFolding.txt> of the Unicode Character Database
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and generates C source code that implements the I<simple case folding>
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as defined in that file.
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The generated source code can then be used like this:
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unicode_val_T
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unicode_simple_case_fold(unicode_val_T c)
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{
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#include "casefold.inc"
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return c;
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}
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=head1 BUGS
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Does not support B<--help> nor B<--version>.
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=head1 AUTHOR
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Kalle Olavi Niemitalo <kon@iki.fi>
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=head1 COPYRIGHT AND LICENSE
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Copyright (c) 2006 Kalle Olavi Niemitalo.
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Permission to use, copy, modify, and/or distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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