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|
#!perl -w
package version;
use 5.005_04;
use strict;
use vars qw(@ISA $VERSION $CLASS $STRICT $LAX *declare *qv);
$VERSION = '0.80';
$VERSION = eval $VERSION;
$CLASS = 'version';
# Define STRICT version parsing
my $DECIMAL_VERSION = '
(?:
(?: # integer part
0(?=[.]) # 0 but only if followed by a period
| # or
[1-9] # 1-9 followed by
[0-9]* # zero or more digits
)
(?: # decimal part
[.] # literal decimal point
[0-9]+ # one or more digits
)? # optional
)';
my $DOTTED_DECIMAL_VERSION = '
(?:
v # leading v required
(?: # integer part
0(?=[.]) # 0 but only if followed by a period
| # or
[1-9] # 1-9 followed by
[0-9]* # zero or more digits
)
(?: # repeated part
[.] # literal decimal point
[0-9]{1,3} # followed by one to three digits
){2,} # repeating 2 or more times
)';
$STRICT = qr/(?:${DECIMAL_VERSION}|${DOTTED_DECIMAL_VERSION})/x;
# Define LAX version parsing
my $ALPHA = '
(?:
[_] # literal underscore
[0-9]{1,} # followed by one or more digits
)';
my $LAX_DOTTED_DECIMAL_VERSION = '
(?:
(?:
v # leading v required
(?: # integer part
[0-9]+ # zero or more digits
)
(?: # repeated part
[.] # literal decimal point
[0-9]{1,} # followed by one or more digits
){0,} # repeating zero or more times
)
| # or
(?:
v # leading v required
(?: # integer part
[0-9]+ # zero or more digits
)
(?: # repeated part
[.] # literal decimal point
[0-9]{1,} # followed by one or more digits
){1,} # repeating one or more times
${ALPHA}* # with trailing optional alpha stanza(s)
)
| # or
(?:
(?!v) # no leading v
(?: # integer part
0(?=[.]) # 0 but only if followed by a period
| # or
[1-9] # 1-9 followed by
[0-9]* # zero or more digits
)
(?: # repeated part
[.] # literal decimal point
[0-9]{1,} # followed by one or more digits
){2,} # repeating two or more times
${ALPHA}* # with trailing optional alpha stanza(s)
)
)
';
my $LAX_DECIMAL_VERSION = '
(?:
(?:
(?: # integer part
0(?=[.]) # 0 but only if followed by a period
| # or
[1-9] # 1-9 followed by
[0-9]* # zero or more digits
)
(?: # decimal part
[.] # literal decimal point
[0-9]+ # one or more digits
)? # optional
)
| # or
(?:
(?: # integer part
0(?=[.]) # 0 but only if followed by a period
| # or
[1-9] # 1-9 followed by
[0-9]* # zero or more digits
) # mantissa required
(?: # decimal part
[.] # literal decimal point
[0-9]+ # one or more digits
) # required
${ALPHA}* # with trailing optional alpha stanza(s)
)
)
';
$LAX= qr/(?:${LAX_DECIMAL_VERSION}|${LAX_DOTTED_DECIMAL_VERSION})/x;
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 $^W;
*version::qv = \&version::vpp::qv;
*version::declare = \&version::vpp::declare;
*version::_VERSION = \&version::vpp::_VERSION;
if ($] > 5.009001 && $] <= 5.010000) {
no strict 'refs';
*{'version::stringify'} = \*version::vpp::stringify;
*{'version::(""'} = \*version::vpp::stringify;
*{'version::new'} = \*version::vpp::new;
}
}
else { # use XS module
push @ISA, "version::vxs";
local $^W;
*version::declare = \&version::vxs::declare;
*version::qv = \&version::vxs::qv;
*version::_VERSION = \&version::vxs::_VERSION;
if ($] > 5.009001 && $] < 5.010000) {
no strict 'refs';
*{'version::stringify'} = \*version::vxs::stringify;
*{'version::(""'} = \*version::vxs::stringify;
}
elsif ($] == 5.010000) {
no strict 'refs';
*{'version::stringify'} = \*version::vxs::stringify;
*{'version::(""'} = \*version::vxs::stringify;
*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 $callpkg = caller();
if (exists($args{declare})) {
*{$callpkg."::declare"} =
sub {return $class->declare(shift) }
unless defined(&{$callpkg.'::declare'});
}
if (exists($args{qv})) {
*{$callpkg."::qv"} =
sub {return $class->qv(shift) }
unless defined(&{"$callpkg\::qv"});
}
if (exists($args{'UNIVERSAL::VERSION'})) {
local $^W;
*UNIVERSAL::VERSION
= \&version::_VERSION;
}
if (exists($args{'VERSION'})) {
*{$callpkg."::VERSION"} = \&version::_VERSION;
}
}
1;
|
