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lib/B/Deparse.pm  view on Meta::CPAN

    $self->{'ambient_warnings'} = undef; # Assume no lexical warnings
    $self->{'ambient_hints'} = 0;
    $self->{'ambient_hinthash'} = undef;
    $self->init();

    while (my $arg = shift @_) {
	if ($arg eq "-d") {
	    $self->{'use_dumper'} = 1;
	    require Data::Dumper;
	} elsif ($arg =~ /^-f(.*)/) {
	    $self->{'files'}{$1} = 1;
	} elsif ($arg eq "-l") {
	    $self->{'linenums'} = 1;
	} elsif ($arg eq "-p") {
	    $self->{'parens'} = 1;
	} elsif ($arg eq "-P") {
	    $self->{'noproto'} = 1;
	} elsif ($arg eq "-q") {
	    $self->{'unquote'} = 1;
	} elsif (substr($arg, 0, 2) eq "-s") {
	    $self->style_opts(substr $arg, 2);
	} elsif ($arg =~ /^-x(\d)$/) {
	    $self->{'expand'} = $1;
	}
    }
    return $self;
}


# Initialise the contextual information, either from
# defaults provided with the ambient_pragmas method,
# or from perl's own defaults otherwise.
sub init {
    my $self = shift;

    $self->{'warnings'} = $self->{'ambient_warnings'};
    $self->{'hints'}    = $self->{'ambient_hints'};
    $self->{'hinthash'} = $self->{'ambient_hinthash'};

    # also a convenient place to clear out subs_declared
    delete $self->{'subs_declared'};
}

sub compile {
    my(@args) = @_;
    return sub {
	my $self = B::Deparse->new(@args);
	# First deparse command-line args
	if (defined $^I) { # deparse -i
	    print q(BEGIN { $^I = ).perlstring($^I).qq(; }\n);
	}
	if ($^W) { # deparse -w
	    print qq(BEGIN { \$^W = $^W; }\n);
	}
	if ($/ ne "\n" or defined $O::savebackslash) { # deparse -l and -0
	    my $fs = perlstring($/) || 'undef';
	    my $bs = perlstring($O::savebackslash) || 'undef';
	    print qq(BEGIN { \$/ = $fs; \$\\ = $bs; }\n);
	}
	my @BEGINs  = B::begin_av->isa("B::AV") ? B::begin_av->ARRAY : ();
	my @UNITCHECKs = B::unitcheck_av->isa("B::AV")
	    ? B::unitcheck_av->ARRAY
	    : ();
	my @CHECKs  = B::check_av->isa("B::AV") ? B::check_av->ARRAY : ();
	my @INITs   = B::init_av->isa("B::AV") ? B::init_av->ARRAY : ();
	my @ENDs    = B::end_av->isa("B::AV") ? B::end_av->ARRAY : ();
	my @names = qw(BEGIN UNITCHECK CHECK INIT END);
	my @blocks = \(@BEGINs, @UNITCHECKs, @CHECKs, @INITs, @ENDs);
	while (@names) {
	    my ($name, $blocks) = (shift @names, shift @blocks);
	    for my $block (@$blocks) {
		$self->todo($block, 0, $name);
	    }
	}
	$self->stash_subs();
	local($SIG{"__DIE__"}) =
	  sub {
	      if ($self->{'curcop'}) {
		  my $cop = $self->{'curcop'};
		  my($line, $file) = ($cop->line, $cop->file);
		  print STDERR "While deparsing $file near line $line,\n";
	      }
	    };
	$self->{'curcv'} = main_cv;
	$self->{'curcvlex'} = undef;
	print $self->print_protos;
	@{$self->{'subs_todo'}} =
	  sort {$a->[0] <=> $b->[0]} @{$self->{'subs_todo'}};
	my $root = main_root;
	local $B::overlay = {};
	unless (null $root) {
	    $self->pad_subs($self->{'curcv'});
	    # Check for a stub-followed-by-ex-cop, resulting from a program
	    # consisting solely of sub declarations.  For backward-compati-
	    # bility (and sane output) we don’t want to emit the stub.
	    #   leave
	    #     enter
	    #     stub
	    #     ex-nextstate (or ex-dbstate)
	    my $kid;
	    if ( $root->name eq 'leave'
	     and ($kid = $root->first)->name eq 'enter'
	     and !null($kid = $kid->sibling) and $kid->name eq 'stub'
	     and !null($kid = $kid->sibling) and $kid->name eq 'null'
	     and class($kid) eq 'COP' and null $kid->sibling )
	    {
		# ignore
	    } else {
		$self->pessimise($root, main_start);
		print $self->indent($self->deparse_root($root)), "\n";
	    }
	}
	my @text;
	while (scalar(@{$self->{'subs_todo'}})) {
	    push @text, $self->next_todo;
	}
	print $self->indent(join("", @text)), "\n" if @text;

	# Print __DATA__ section, if necessary
	no strict 'refs';
	my $laststash = defined $self->{'curcop'}
	    ? $self->{'curcop'}->stash->NAME : $self->{'curstash'};
	if (defined *{$laststash."::DATA"}{IO}) {
	    print $self->keyword("package") . " $laststash;\n"
		unless $laststash eq $self->{'curstash'};
	    print $self->keyword("__DATA__") . "\n";
	    print readline(*{$laststash."::DATA"});
	}