78 lines
2.5 KiB
Perl
78 lines
2.5 KiB
Perl
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#!/usr/bin/perl
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#
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# bdftruncate.pl -- Markus Kuhn <http://www.cl.cam.ac.uk/~mgk25/>
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#
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# This Perl script allows you to generate from an ISO10646-1 encoded
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# BDF font other ISO10646-1 BDF fonts in which all characters above
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# a threshold code value are stored unencoded.
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#
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# $ucs-fonts: bdftruncate.pl,v 1.7 2004-11-28 18:41:13+00 mgk25 Rel $
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# Subroutine to identify whether the ISO 10646/Unicode character code
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# ucs belongs into the East Asian Wide (W) or East Asian FullWidth
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# (F) category as defined in Unicode Technical Report #11.
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sub iswide ($) {
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my $ucs = shift(@_);
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return ($ucs >= 0x1100 &&
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($ucs <= 0x115f || # Hangul Jamo
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($ucs >= 0x2e80 && $ucs <= 0xa4cf &&
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($ucs & ~0x0011) != 0x300a && $ucs != 0x303f) || # CJK .. Yi
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($ucs >= 0xac00 && $ucs <= 0xd7a3) || # Hangul Syllables
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($ucs >= 0xf900 && $ucs <= 0xfaff) || # CJK Comp. Ideographs
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($ucs >= 0xfe30 && $ucs <= 0xfe6f) || # CJK Comp. Forms
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($ucs >= 0xff00 && $ucs <= 0xff5f) || # Fullwidth Forms
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($ucs >= 0xffe0 && $ucs <= 0xffe6) ||
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($ucs >= 0x20000 && $ucs <= 0x2ffff)));
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}
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# parse options
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if ($ARGV[0] eq '-w' || $ARGV[0] eq '+w') {
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$removewide = $ARGV[0] eq '-w';
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shift @ARGV;
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}
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print STDERR <<End if $#ARGV != 0;
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Usage: bdftruncate.pl [+w|-w] threshold <source.bdf >destination.bdf
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Example:
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bdftruncate.pl 0x3200 <6x13.bdf >6x13t.bdf
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will generate the file 6x13t.bdf in which all glyphs with codes
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>= 0x3200 will only be stored unencoded (i.e., ENCODING -1).
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Option -w removes East Asian Wide and East Asian FullWidth characters
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(default if threshold <= 0x3200), and option +w keeps them.
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End
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exit 1 if $#ARGV != 0;
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# read threshold value from command line
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$threshold = $ARGV[0];
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if ($threshold =~ /^(0[xX]|U[+-]?)([0-9a-fA-F]+)$/) {
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$threshold = hex($2);
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} elsif (!($threshold =~ /^[0-9]+$/)) {
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die("Illegal threshold '$threshold'!\n");
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}
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$removewide = $threshold <= 0x3200 unless defined $removewide;
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# filter file
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while (<STDIN>) {
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if (/^ENCODING\s+(-?\d+)/ &&
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($1 >= $threshold || ($removewide && iswide($1)))) {
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print "ENCODING -1\n";
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} elsif (/^STARTFONT/) {
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print;
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print "COMMENT AUTOMATICALLY GENERATED FILE. DO NOT EDIT!\n";
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printf("COMMENT In this version of the font file, all characters >= " .
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"U+%04X are\nCOMMENT not encoded to keep XFontStruct small.\n",
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$threshold);
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} else {
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s/^COMMENT\s+\"(.*)\"$/COMMENT $1/;
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s/^COMMENT\s+\$[I]d: (.*)\$\s*$/COMMENT Derived from $1\n/;
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print;
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}
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}
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