t/io/layers.t

#!./perl

my $PERLIO;

BEGIN {
    chdir 't' if -d 't';
    @INC = '../lib';
    require './test.pl';
    unless (find PerlIO::Layer 'perlio') {
    print "1..0 # Skip: not perlio\n";
    exit 0;
    }
    eval 'use Encode';
    if ($@ =~ /dynamic loading not available/) {
        print "1..0 # miniperl cannot load Encode\n";
    exit 0;
    }
    # Makes testing easier.
    $ENV{PERLIO} = 'stdio' if exists $ENV{PERLIO} && $ENV{PERLIO} eq '';
    if (exists $ENV{PERLIO} && $ENV{PERLIO} !~ /^(stdio|perlio|mmap)$/) {
    # We are not prepared for anything else.
    print "1..0 # PERLIO='$ENV{PERLIO}' unknown\n";
    exit 0;
    }
    $PERLIO = exists $ENV{PERLIO} ? $ENV{PERLIO} : "(undef)";
}

use Config;

my $DOSISH    = $^O =~ /^(?:MSWin32|os2|dos|NetWare|mint)$/ ? 1 : 0;
   $DOSISH    = 1 if !$DOSISH and $^O =~ /^uwin/;
my $NONSTDIO  = exists $ENV{PERLIO} && $ENV{PERLIO} ne 'stdio'     ? 1 : 0;
my $FASTSTDIO = $Config{d_faststdio} && $Config{usefaststdio}      ? 1 : 0;

my $NTEST = 43 - (($DOSISH || !$FASTSTDIO) ? 7 : 0) - ($DOSISH ? 5 : 0);

plan tests => $NTEST;

print <<__EOH__;
# PERLIO    = $PERLIO
# DOSISH    = $DOSISH
# NONSTDIO  = $NONSTDIO
# FASTSTDIO = $FASTSTDIO
__EOH__

SKIP: {
    # FIXME - more of these could be tested without Encode or full perl
    skip("This perl does not have Encode", $NTEST)
    unless " $Config{extensions} " =~ / Encode /;
    skip("miniperl does not have Encode", $NTEST) if $ENV{PERL_CORE_MINITEST};

    sub check {
    my ($result, $expected, $id) = @_;
    # An interesting dance follows where we try to make the following
    # IO layer stack setups to compare equal:
    #
    # PERLIO     UNIX-like                   DOS-like
    #
    # unset / "" unix perlio / stdio [1]     unix crlf
    # stdio      unix perlio / stdio [1]     stdio
    # perlio     unix perlio                 unix perlio
    # mmap       unix mmap                   unix mmap
    #
    # [1] "stdio" if Configure found out how to do "fast stdio" (depends
    # on the stdio implementation) and in Perl 5.8, otherwise "unix perlio"
    #
    if ($NONSTDIO) {
        # Get rid of "unix".
        shift @$result if $result->[0] eq "unix";
        # Change expectations.
        if ($FASTSTDIO) {
        $expected->[0] = $ENV{PERLIO};
        } else {
        $expected->[0] = $ENV{PERLIO} if $expected->[0] eq "stdio";
        }
    } elsif (!$FASTSTDIO && !$DOSISH) {
        splice(@$result, 0, 2, "stdio")
        if @$result >= 2 &&
           $result->[0] eq "unix" &&
           $result->[1] eq "perlio";
    } elsif ($DOSISH) {
        splice(@$result, 0, 2, "stdio")
        if @$result >= 2 &&
           $result->[0] eq "unix" &&
           $result->[1] eq "crlf";
    }
    if ($DOSISH && grep { $_ eq 'crlf' } @$expected) {
        # 5 tests potentially skipped because
        # DOSISH systems already have a CRLF layer
        # which will make new ones not stick.
        @$expected = grep { $_ ne 'crlf' } @$expected;
    }
    my $n = scalar @$expected;
    is($n, scalar @$expected, "$id - layers == $n");
    for (my $i = 0; $i < $n; $i++) {
        my $j = $expected->[$i];
        if (ref $j eq 'CODE') {
        ok($j->($result->[$i]), "$id - $i is ok");
        } else {
        is($result->[$i], $j,
           sprintf("$id - $i is %s",
               defined $j ? $j : "undef"));
        }
    }
    }

    check([ PerlIO::get_layers(STDIN) ],
      [ "stdio" ],
      "STDIN");

    open(F, ">:crlf", "afile");

    check([ PerlIO::get_layers(F) ],
      [ qw(stdio crlf) ],
      "open :crlf");

    binmode(F, ":encoding(sjis)"); # "sjis" will be canonized to "shiftjis"

    check([ PerlIO::get_layers(F) ],
      [ qw[stdio crlf encoding(shiftjis) utf8] ],
      ":encoding(sjis)");

    binmode(F, ":pop");

    check([ PerlIO::get_layers(F) ],
      [ qw(stdio crlf) ],
      ":pop");

    binmode(F, ":raw");

    check([ PerlIO::get_layers(F) ],
      [ "stdio" ],
      ":raw");

    binmode(F, ":utf8");

    check([ PerlIO::get_layers(F) ],
      [ qw(stdio utf8) ],
      ":utf8");

    binmode(F, ":bytes");

    check([ PerlIO::get_layers(F) ],
      [ "stdio" ],
      ":bytes");

    binmode(F, ":encoding(utf8)");

    check([ PerlIO::get_layers(F) ],
        [ qw[stdio encoding(utf8) utf8] ],
        ":encoding(utf8)");

    binmode(F, ":raw :crlf");

    check([ PerlIO::get_layers(F) ],
      [ qw(stdio crlf) ],
      ":raw:crlf");

    binmode(F, ":raw :encoding(latin1)"); # "latin1" will be canonized

    # 7 tests potentially skipped.
    unless ($DOSISH || !$FASTSTDIO) {
    my @results = PerlIO::get_layers(F, details => 1);

    # Get rid of the args and the flags.
    splice(@results, 1, 2) if $NONSTDIO;

    check([ @results ],
          [ "stdio",    undef,        sub { $_[0] > 0 },
        "encoding", "iso-8859-1", sub { $_[0] & PerlIO::F_UTF8() } ],
          ":raw:encoding(latin1)");
    }

    binmode(F);

    check([ PerlIO::get_layers(F) ],
      [ "stdio" ],
      "binmode");

    close F;

    {
    use open(IN => ":crlf", OUT => ":encoding(cp1252)");

    open F, "<afile";
    open G, ">afile";

    check([ PerlIO::get_layers(F, input  => 1) ],
          [ qw(stdio crlf) ],
          "use open IN");

    check([ PerlIO::get_layers(G, output => 1) ],
          [ qw[stdio encoding(cp1252) utf8] ],
          "use open OUT");

    close F;
    close G;
    }

    1 while unlink "afile";
}