package library;
use strict;
require Exporter;
our(@ISA, @EXPORT);
@ISA = qw(Exporter);
@EXPORT = qw(addName encode_entities); # symbols to export by default

sub encode_entities {
    my(@a) = @_;
    foreach (@a) {
        s/&/&/gos;
        s/</&lt;/gos;
        s/>/&gt;/gos;
        s/"/&quot;/gos;
    }
    local $" = '';
    return "@a";
}

sub addName($$$) {
    my($code, $result, $names) = @_;
    # XXX should support Hangul
    open(FILEA, 'NamesList.txt');
    my $data;
    while (defined($data = <FILEA>) and $data !~ m/^$code\t/s) { }
    if ($data) {
        $$result .= 'U+';
        my $charname = $data;
        $charname =~ s/\t/ /gos;
        chomp $charname;
        my $charitself = hex($code) < 0x7F ?
                         (hex($code) <= 0x20 or (hex($code) >= 0x61 and hex($code) <= 0x7A)
                                             or (hex($code) >= 0x41 and hex($code) <= 0x5A)) ? '' : ' (' . chr(hex($code)) . ')' : " (&#x$code;)";
        $$names .= "U+$charname character$charitself\n";
        do { $$result .= $data } while (defined($data = <FILEA>) and $data =~ m/^\t/os);
    } else {
        open(FILEB, 'Unihan.txt');
        while (defined($data = <FILEB>) and $data !~ m/^U\+$code\t/s) { }
        if ($data) {
            $$names .= "U+$code CJK UNIFIED IDEOGRAPH character (&#x$code)\n";
            $$result .= "U+$code\tCJK UNIFIED IDEOGRAPH\n";
            do {
                $data =~ s/^U\+$code\t(k\S+)\t/\t$1: /gs;
                $$result .= $data;
            } while (defined($data = <FILEB>) and $data =~ m/^U\+$code\t/s);
        } else {
            $$names .= "U+$code character\n";
            $$result .= "U+$code\tUNKNOWN CHARACTER\n";
        }
        close(FILEB);
    }
    close(FILEA);
}