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/usr/share/perl5/Test/Deep/Stack.pm is in libtest-deep-perl 0.108-1.

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use strict;
use warnings;

package Test::Deep::Stack;

use Carp qw( confess );

use Test::Deep::MM qw( new init Stack Arrow );

sub init
{
	my $self = shift;

	$self->SUPER::init(@_);

	$self->setStack([]) unless $self->getStack;
}

sub push
{
	my $self = shift;

	push(@{$self->getStack}, @_);
}

sub pop
{
	my $self = shift;

	return pop @{$self->getStack};
}

sub render
{
	my $self = shift;
	my $var = shift;

	my $stack = $self->getStack;

	$self->setArrow(0);

	foreach my $data (@$stack)
	{
		my $exp = $data->{exp};
		if (UNIVERSAL::isa($exp, "Test::Deep::Cmp"))
		{
			$var = $exp->render_stack($var, $data);

			$self->setArrow(0) if $exp->reset_arrow;
		}
		else
		{
			confess "Don't know how to render '$exp'";
		}
	}

	return $var;
}

sub getLast
{
	my $self = shift;

	return $self->getStack->[-1];
}

sub incArrow
{
	my $self = shift;

	my $a = $self->getArrow;
	$self->setArrow($a + 1);

	return $a;
}

sub length
{
	my $self = shift;

	return @{$self->getStack} + 0;
}

1;