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# Strict version regexp definitions
#--------------------------------------------------------------------------#

# Strict decimal version number.

my $STRICT_DECIMAL_VERSION =
    qr/ $STRICT_INTEGER_PART $FRACTION_PART? /x;

# Strict dotted-decimal version number.  Must have both leading "v" and
# at least three parts, to avoid confusion with decimal syntax.

my $STRICT_DOTTED_DECIMAL_VERSION =
    qr/ v $STRICT_INTEGER_PART $STRICT_DOTTED_DECIMAL_PART{2,} /x;

# Complete strict version number syntax -- should generally be used
# anchored: qr/ \A $STRICT \z /x

$STRICT =
    qr/ $STRICT_DECIMAL_VERSION | $STRICT_DOTTED_DECIMAL_VERSION /x;

#--------------------------------------------------------------------------#
# Lax version regexp definitions
#--------------------------------------------------------------------------#

# Lax decimal version number.  Just like the strict one except for
# allowing an alpha suffix or allowing a leading or trailing
# decimal-point

my $LAX_DECIMAL_VERSION =
    qr/ $LAX_INTEGER_PART (?: \. | $FRACTION_PART $LAX_ALPHA_PART? )?
	|
	$FRACTION_PART $LAX_ALPHA_PART?
    /x;

# Lax dotted-decimal version number.  Distinguished by having either
# leading "v" or at least three non-alpha parts.  Alpha part is only
# permitted if there are at least two non-alpha parts. Strangely
# enough, without the leading "v", Perl takes .1.2 to mean v0.1.2,
# so when there is no "v", the leading part is optional

my $LAX_DOTTED_DECIMAL_VERSION =
    qr/
	v $LAX_INTEGER_PART (?: $LAX_DOTTED_DECIMAL_PART+ $LAX_ALPHA_PART? )?
	|
	$LAX_INTEGER_PART? $LAX_DOTTED_DECIMAL_PART{2,} $LAX_ALPHA_PART?
    /x;

# Complete lax version number syntax -- should generally be used
# anchored: qr/ \A $LAX \z /x
#
# The string 'undef' is a special case to make for easier handling
# of return values from ExtUtils::MM->parse_version

$LAX =
    qr/ undef | $LAX_DECIMAL_VERSION | $LAX_DOTTED_DECIMAL_VERSION /x;

#--------------------------------------------------------------------------#

{
    local $SIG{'__DIE__'};
    eval "use version::vxs $VERSION";
    if ( $@ ) { # don't have the XS version installed
	eval "use version::vpp $VERSION"; # don't tempt fate
	die "$@" if ( $@ );
	push @ISA, "version::vpp";
	local $^W;
	*version::qv = \&version::vpp::qv;
	*version::declare = \&version::vpp::declare;
	*version::_VERSION = \&version::vpp::_VERSION;
	*version::vcmp = \&version::vpp::vcmp;
	if ($] >= 5.009000) {
	    no strict 'refs';
	    *version::stringify = \&version::vpp::stringify;
	    *{'version::(""'} = \&version::vpp::stringify;
	    *{'version::(<=>'} = \&version::vpp::vcmp;
	    *version::new = \&version::vpp::new;
	    *version::parse = \&version::vpp::parse;
	}
    }
    else { # use XS module
	push @ISA, "version::vxs";
	local $^W;
	*version::declare = \&version::vxs::declare;
	*version::qv = \&version::vxs::qv;
	*version::_VERSION = \&version::vxs::_VERSION;
	*version::vcmp = \&version::vxs::VCMP;
	if ($] >= 5.009000) {
	    no strict 'refs';
	    *version::stringify = \&version::vxs::stringify;
	    *{'version::(""'} = \&version::vxs::stringify;
	    *{'version::(<=>'} = \&version::vxs::VCMP;
	    *version::new = \&version::vxs::new;
	    *version::parse = \&version::vxs::parse;
	}

    }
}

# Preloaded methods go here.
sub import {
    no strict 'refs';
    my ($class) = shift;

    # Set up any derived class
    unless ($class eq 'version') {
	local $^W;
	*{$class.'::declare'} =  \&version::declare;
	*{$class.'::qv'} = \&version::qv;
    }

    my %args;
    if (@_) { # any remaining terms are arguments
	map { $args{$_} = 1 } @_
    }
    else { # no parameters at all on use line
    	%args = 
	(
	    qv => 1,
	    'UNIVERSAL::VERSION' => 1,
	);
    }

    my $callpkg = caller();