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package TAP::Parser::SourceHandler::Perl;
use strict;
use warnings;
use Config;
use constant IS_WIN32 => ( $^O =~ /^(MS)?Win32$/ );
use constant IS_VMS => ( $^O eq 'VMS' );
use TAP::Parser::IteratorFactory ();
use TAP::Parser::Iterator::Process ();
use Text::ParseWords qw(shellwords);
use base 'TAP::Parser::SourceHandler::Executable';
TAP::Parser::IteratorFactory->register_handler(__PACKAGE__);
=head1 NAME
TAP::Parser::SourceHandler::Perl - Stream TAP from a Perl executable
=head1 VERSION
Version 3.42
=cut
our $VERSION = '3.42';
=head1 SYNOPSIS
use TAP::Parser::Source;
use TAP::Parser::SourceHandler::Perl;
my $source = TAP::Parser::Source->new->raw( \'script.pl' );
$source->assemble_meta;
my $class = 'TAP::Parser::SourceHandler::Perl';
my $vote = $class->can_handle( $source );
my $iter = $class->make_iterator( $source );
=head1 DESCRIPTION
This is a I<Perl> L<TAP::Parser::SourceHandler> - it has 2 jobs:
1. Figure out if the L<TAP::Parser::Source> it's given is actually a Perl
script (L</can_handle>).
2. Creates an iterator for Perl sources (L</make_iterator>).
Unless you're writing a plugin or subclassing L<TAP::Parser>, you probably
won't need to use this module directly.
=head1 METHODS
=head2 Class Methods
=head3 C<can_handle>
my $vote = $class->can_handle( $source );
Only votes if $source looks like a file. Casts the following votes:
0.9 if it has a shebang ala "#!...perl"
0.75 if it has any shebang
0.8 if it's a .t file
0.9 if it's a .pl file
0.75 if it's in a 't' directory
0.25 by default (backwards compat)
=cut
sub can_handle {
my ( $class, $source ) = @_;
my $meta = $source->meta;
return 0 unless $meta->{is_file};
my $file = $meta->{file};
if ( my $shebang = $file->{shebang} ) {
return 0.9 if $shebang =~ /^#!.*\bperl/;
# We favour Perl as the interpreter for any shebang to preserve
# previous semantics: we used to execute everything via Perl and
# relied on it to pass the shebang off to the appropriate
# interpreter.
return 0.3;
}
return 0.8 if $file->{lc_ext} eq '.t'; # vote higher than Executable
return 0.9 if $file->{lc_ext} eq '.pl';
return 0.75 if $file->{dir} =~ /^t\b/; # vote higher than Executable
# backwards compat, always vote:
return 0.25;
}
=head3 C<make_iterator>
my $iterator = $class->make_iterator( $source );
Constructs & returns a new L<TAP::Parser::Iterator::Process> for the source.
Assumes C<$source-E<gt>raw> contains a reference to the perl script. C<croak>s
if the file could not be found.
The command to run is built as follows:
$perl @switches $perl_script @test_args
The perl command to use is determined by L</get_perl>. The command generated
is guaranteed to preserve:
PERL5LIB
PERL5OPT
Taint Mode, if set in the script's shebang
I<Note:> the command generated will I<not> respect any shebang line defined in
your Perl script. This is only a problem if you have compiled a custom version
of Perl or if you want to use a specific version of Perl for one test and a
different version for another, for example:
#!/path/to/a/custom_perl --some --args
#!/usr/local/perl-5.6/bin/perl -w
Currently you need to write a plugin to get around this.
=cut
sub _autoflush_stdhandles {
my ($class) = @_;
$class->_autoflush( \*STDOUT );
$class->_autoflush( \*STDERR );
}
sub make_iterator {
my ( $class, $source ) = @_;
my $meta = $source->meta;
my $perl_script = ${ $source->raw };
$class->_croak("Cannot find ($perl_script)") unless $meta->{is_file};
# TODO: does this really need to be done here?
$class->_autoflush_stdhandles;
my ( $libs, $switches )
= $class->_mangle_switches(
$class->_filter_libs( $class->_switches($source) ) );
$class->_run( $source, $libs, $switches );
}
sub _has_taint_switch {
my( $class, $switches ) = @_;
my $has_taint = grep { $_ eq "-T" || $_ eq "-t" } @{$switches};
return $has_taint ? 1 : 0;
}
sub _mangle_switches {
my ( $class, $libs, $switches ) = @_;
# Taint mode ignores environment variables so we must retranslate
# PERL5LIB as -I switches and place PERL5OPT on the command line
# in order that it be seen.
if ( $class->_has_taint_switch($switches) ) {
my @perl5lib = defined $ENV{PERL5LIB} ? split /$Config{path_sep}/, $ENV{PERL5LIB} : ();
return (
$libs,
[ @{$switches},
$class->_libs2switches([@$libs, @perl5lib]),
defined $ENV{PERL5OPT} ? shellwords( $ENV{PERL5OPT} ) : ()
],
);
}
return ( $libs, $switches );
}
sub _filter_libs {
my ( $class, @switches ) = @_;
my $path_sep = $Config{path_sep};
my $path_re = qr{$path_sep};
# Filter out any -I switches to be handled as libs later.
#
# Nasty kludge. It might be nicer if we got the libs separately
# although at least this way we find any -I switches that were
# supplied other then as explicit libs.
#
# We filter out any names containing colons because they will break
# PERL5LIB
my @libs;
my @filtered_switches;
for (@switches) {
if ( !/$path_re/ && m/ ^ ['"]? -I ['"]? (.*?) ['"]? $ /x ) {
push @libs, $1;
}
else {
push @filtered_switches, $_;
}
}
return \@libs, \@filtered_switches;
}
sub _iterator_hooks {
my ( $class, $source, $libs, $switches ) = @_;
my $setup = sub {
if ( @{$libs} and !$class->_has_taint_switch($switches) ) {
$ENV{PERL5LIB} = join(
$Config{path_sep}, grep {defined} @{$libs},
$ENV{PERL5LIB}
);
}
};
# VMS environment variables aren't guaranteed to reset at the end of
# the process, so we need to put PERL5LIB back.
my $previous = $ENV{PERL5LIB};
my $teardown = sub {
if ( defined $previous ) {
$ENV{PERL5LIB} = $previous;
}
else {
delete $ENV{PERL5LIB};
}
};
return ( $setup, $teardown );
}
sub _run {
my ( $class, $source, $libs, $switches ) = @_;
my @command = $class->_get_command_for_switches( $source, $switches )
or $class->_croak("No command found!");
my ( $setup, $teardown ) = $class->_iterator_hooks( $source, $libs, $switches );
return $class->_create_iterator( $source, \@command, $setup, $teardown );
}
sub _create_iterator {
my ( $class, $source, $command, $setup, $teardown ) = @_;
return TAP::Parser::Iterator::Process->new(
{ command => $command,
merge => $source->merge,
setup => $setup,
teardown => $teardown,
}
);
}
sub _get_command_for_switches {
my ( $class, $source, $switches ) = @_;
my $file = ${ $source->raw };
my @args = @{ $source->test_args || [] };
my $command = $class->get_perl;
# XXX don't need to quote if we treat the parts as atoms (except maybe vms)
#$file = qq["$file"] if ( $file =~ /\s/ ) && ( $file !~ /^".*"$/ );
my @command = ( $command, @{$switches}, $file, @args );
return @command;
}
sub _libs2switches {
my $class = shift;
return map {"-I$_"} grep {$_} @{ $_[0] };
}
=head3 C<get_taint>
Decode any taint switches from a Perl shebang line.
# $taint will be 't'
my $taint = TAP::Parser::SourceHandler::Perl->get_taint( '#!/usr/bin/perl -t' );
# $untaint will be undefined
my $untaint = TAP::Parser::SourceHandler::Perl->get_taint( '#!/usr/bin/perl' );
=cut
sub get_taint {
my ( $class, $shebang ) = @_;
return
unless defined $shebang
&& $shebang =~ /^#!.*\bperl.*\s-\w*([Tt]+)/;
return $1;
}
sub _switches {
my ( $class, $source ) = @_;
my $file = ${ $source->raw };
my @switches = @{ $source->switches || [] };
my $shebang = $source->meta->{file}->{shebang};
return unless defined $shebang;
my $taint = $class->get_taint($shebang);
push @switches, "-$taint" if defined $taint;
# Quote the argument if we're VMS, since VMS will downcase anything
# not quoted.
if (IS_VMS) {
for (@switches) {
$_ = qq["$_"];
}
}
return @switches;
}
=head3 C<get_perl>
Gets the version of Perl currently running the test suite.
=cut
sub get_perl {
my $class = shift;
return $ENV{HARNESS_PERL} if defined $ENV{HARNESS_PERL};
return qq["$^X"] if IS_WIN32 && ( $^X =~ /[^\w\.\/\\]/ );
return $^X;
}
1;
__END__
=head1 SUBCLASSING
Please see L<TAP::Parser/SUBCLASSING> for a subclassing overview.
=head2 Example
package MyPerlSourceHandler;
use strict;
use TAP::Parser::SourceHandler::Perl;
use base 'TAP::Parser::SourceHandler::Perl';
# use the version of perl from the shebang line in the test file
sub get_perl {
my $self = shift;
if (my $shebang = $self->shebang( $self->{file} )) {
$shebang =~ /^#!(.*\bperl.*?)(?:(?:\s)|(?:$))/;
return $1 if $1;
}
return $self->SUPER::get_perl(@_);
}
=head1 SEE ALSO
L<TAP::Object>,
L<TAP::Parser>,
L<TAP::Parser::IteratorFactory>,
L<TAP::Parser::SourceHandler>,
L<TAP::Parser::SourceHandler::Executable>,
L<TAP::Parser::SourceHandler::File>,
L<TAP::Parser::SourceHandler::Handle>,
L<TAP::Parser::SourceHandler::RawTAP>
=cut
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