source: trunk/essentials/dev-lang/perl/t/uni/case.pl

use File::Spec;

require "test.pl";

sub unidump {
    join " ", map { sprintf "%04X", $_ } unpack "U*", $_[0];
}

sub casetest {
    my ($base, $spec, @funcs) = @_;
    # For each provided function run it, and run a version with some extra
    # characters afterwards. Use a recylcing symbol, as it doesn't change case.
    my $ballast = chr (0x2672) x 3;
    @funcs = map {my $f = $_;
                  ($f,
                   sub {my $r = $f->($_[0] . $ballast); # Add it before
                        $r =~ s/$ballast\z//so # Remove it afterwards
                            or die "'$_[0]' to '$r' mangled";
                        $r; # Result with $ballast removed.
                    },
                   )} @funcs;

    my $file = File::Spec->catfile(File::Spec->catdir(File::Spec->updir,
                                                      "lib", "unicore", "To"),
                                   "$base.pl");
    my $simple = do $file;
    my %simple;
    for my $i (split(/\n/, $simple)) {
        my ($k, $v) = split(' ', $i);
        $simple{$k} = $v;
    }
    my %seen;

    for my $i (sort keys %simple) {
        $seen{$i}++;
    }
    print "# ", scalar keys %simple, " simple mappings\n";

    my $both;

    for my $i (sort keys %$spec) {
        if (++$seen{$i} == 2) {
            warn sprintf "$base: $i seen twice\n";
            $both++;
        }
    }
    print "# ", scalar keys %$spec, " special mappings\n";

    exit(1) if $both;

    my %none;
    for my $i (map { ord } split //,
               "\e !\"#\$%&'()+,-./0123456789:;<=>?\@[\\]^_{|}~\b") {
        next if pack("U0U", $i) =~ /\w/;
        $none{$i}++ unless $seen{$i};
    }
    print "# ", scalar keys %none, " noncase mappings\n";

    my $tests = 
        ((scalar keys %simple) +
         (scalar keys %$spec) +
         (scalar keys %none)) * @funcs;
    print "1..$tests\n";

    my $test = 1;

    for my $i (sort keys %simple) {
        my $w = $simple{$i};
        my $c = pack "U0U", hex $i;
        foreach my $func (@funcs) {
            my $d = $func->($c);
            my $e = unidump($d);
            print $d eq pack("U0U", hex $simple{$i}) ?
                "ok $test # $i -> $w\n" : "not ok $test # $i -> $e ($w)\n";
                $test++;
        }
    }

    for my $i (sort keys %$spec) {
        my $w = unidump($spec->{$i});
        my $u = unpack "U0U", $i;
        my $h = sprintf "%04X", $u;
        my $c = chr($u); $c .= chr(0x100); chop $c;
        foreach my $func (@funcs) {
            my $d = $func->($c);
            my $e = unidump($d);
            if (ord "A" == 193) { # EBCDIC
                # We need to a little bit of remapping.
                #
                # For example, in titlecase (ucfirst) mapping
                # of U+0149 the Unicode mapping is U+02BC U+004E.
                # The 4E is N, which in EBCDIC is 2B--
                # and the ucfirst() does that right.
                # The problem is that our reference
                # data is in Unicode code points.
                #
                # The Right Way here would be to use, say,
                # Encode, to remap the less-than 0x100 code points,
                # but let's try to be Encode-independent here. 
                #
                # These are the titlecase exceptions:
                #
                #         Unicode   Unicode+EBCDIC  
                #
                # 0149 -> 02BC 004E (02BC 002B)
                # 01F0 -> 004A 030C (00A2 030C)
                # 1E96 -> 0048 0331 (00E7 0331)
                # 1E97 -> 0054 0308 (00E8 0308)
                # 1E98 -> 0057 030A (00EF 030A)
                # 1E99 -> 0059 030A (00DF 030A)
                # 1E9A -> 0041 02BE (00A0 02BE)
                #
                # The uppercase exceptions are identical.
                #
                # The lowercase has one more:
                #
                #         Unicode   Unicode+EBCDIC  
                #
                # 0130 -> 0069 0307 (00D1 0307)
                #
                if ($i =~ /^(0130|0149|01F0|1E96|1E97|1E98|1E99|1E9A)$/) {
                    $e =~ s/004E/002B/; # N
                    $e =~ s/004A/00A2/; # J
                    $e =~ s/0048/00E7/; # H
                    $e =~ s/0054/00E8/; # T
                    $e =~ s/0057/00EF/; # W
                    $e =~ s/0059/00DF/; # Y
                    $e =~ s/0041/00A0/; # A
                    $e =~ s/0069/00D1/; # i
                }
                # We have to map the output, not the input, because
                # pack/unpack U has been EBCDICified, too, it would
                # just undo our remapping.
            }
            print $w eq $e ?
                "ok $test # $i -> $w\n" : "not ok $test # $h -> $e ($w)\n";
                $test++;
        }
    }

    for my $i (sort { $a <=> $b } keys %none) {
        my $w = $i = sprintf "%04X", $i;
        my $c = pack "U0U", hex $i;
        foreach my $func (@funcs) {
            my $d = $func->($c);
            my $e = unidump($d);
            print $d eq $c ?
                "ok $test # $i -> $w\n" : "not ok $test # $i -> $e ($w)\n";
                $test++;
        }
    }
}

1;