-#!/usr/bin/perl -w
+#!perl -w
package version;
-use 5.005_03;
+use 5.005_04;
use strict;
-require DynaLoader;
-use vars qw(@ISA $VERSION $CLASS);
+use vars qw(@ISA $VERSION $CLASS *declare *qv);
-@ISA = qw(DynaLoader);
-
-$VERSION = (qw$Revision: 2.7 $)[1]/10;
+$VERSION = 0.77;
$CLASS = 'version';
-local $^W; # shut up the 'redefined' warning for UNIVERSAL::VERSION
-bootstrap version if $] < 5.009;
-
# Preloaded methods go here.
+sub import {
+ no strict 'refs';
+ my ($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($args{'VERSION'})) {
+ *{$callpkg."::VERSION"} = \&version::_VERSION;
+ }
+}
1;
-__END__
-
-=head1 NAME
-
-version - Perl extension for Version Objects
-
-=head1 SYNOPSIS
-
- use version;
- $version = new version "12.2.1"; # must be quoted!
- print $version; # 12.2.1
- print $version->numify; # 12.002001
- if ( $version gt "v12.2" ) # true
-
- $vstring = new version qw(v1.2); # must be quoted!
- print $vstring; # 1.2
-
- $betaver = new version "1.2_3"; # must be quoted!
- print $betaver; # 1.2_3
-
- $perlver = new version 5.005_03; # must not be quoted!
- print $perlver; # 5.5.30
-
-=head1 DESCRIPTION
-
-Overloaded version objects for all versions of Perl. This module
-implements all of the features of version objects which will be part
-of Perl 5.10.0 except automatic v-string handling. See L<"Quoting">.
-
-=head2 What IS a version
-
-For the purposes of this module, a version "number" is a sequence of
-positive integral values separated by decimal points and optionally a
-single underscore. This corresponds to what Perl itself uses for a
-version, as well as extending the "version as number" that is discussed
-in the various editions of the Camel book.
-
-There are actually two distinct ways to initialize versions:
-
-=over 4
-
-=item * Numeric Versions - any initial parameter which "looks like
-a number", see L<Numeric Versions>.
-
-=item * V-String Versions - any initial parameter which contains more
-than one decimal point, contains an embedded underscore, or has a
-leading 'v' see L<V-String Versions>.
-
-=back
-
-Both of these methods will produce similar version objects, in that
-the default stringification will always be in a reduced form, i.e.:
-
- $v = new version 1.002003; # 1.2.3
- $v2 = new version "1.2.3"; # 1.2.3
- $v3 = new version v1.2.3; # 1.2.3 for Perl > v5.8.0
- $v4 = new version 1.2.3; # 1.2.3 for Perl > v5.8.0
-
-Please see L<Quoting> for more details on how Perl will parse various
-input values.
-
-Any value passed to the new() operator will be parsed only so far as it
-contains a numeric, decimal, or underscore character. So, for example:
-
- $v1 = new version "99 and 94/100 percent pure"; # $v1 == 99.0
- $v2 = new version "something"; # $v2 == "" and $v2->numify == 0
-
-However, see L<New Operator> for one case where non-numeric text is
-acceptable when initializing version objects.
-
-=head2 Numeric Versions
-
-These correspond to historical versions of Perl itself prior to v5.6.0,
-as well as all other modules which follow the Camel rules for the
-$VERSION scalar. A numeric version is initialized with what looks like
-a floating point number. Leading zeros B<are> significant and trailing
-zeros are implied so that a minimum of three places is maintained
-between subversions. What this means is that any subversion (digits
-to the right of the decimal place) that contains less than three digits
-will have trailing zeros added to make up the difference. For example:
-
- $v = new version 1.2; # 1.200
- $v = new version 1.02; # 1.20
- $v = new version 1.002; # 1.2
- $v = new version 1.0023; # 1.2.300
- $v = new version 1.00203; # 1.2.30
- $v = new version 1.002_03; # 1.2.30 See L<Quoting>
- $v = new version 1.002003; # 1.2.3
-
-All of the preceeding examples except the second to last are true
-whether or not the input value is quoted. The important feature is that
-the input value contains only a single decimal.
-
-=head2 V-String Versions
-
-These are the newest form of versions, and correspond to Perl's own
-version style beginning with v5.6.0. Starting with Perl v5.10.0,
-this is likely to be the preferred form. This method requires that
-the input parameter be quoted, although Perl > v5.9.0 can use bare
-v-strings as a special form of quoting.
-
-Unlike L<Numeric Versions>, V-String Versions must either have more than
-a single decimal point, e.g. "5.6.1" B<or> must be prefaced by a "v"
-like this "v5.6" (much like v-string notation). In fact, with the
-newest Perl v-strings themselves can be used to initialize version
-objects. Also unlike L<Numeric Versions>, leading zeros are B<not>
-significant, and trailing zeros must be explicitely specified (i.e.
-will not be automatically added). In addition, the subversions are
-not enforced to be three decimal places.
-
-So, for example:
-
- $v = new version "v1.2"; # 1.2
- $v = new version "v1.002"; # 1.2
- $v = new version "1.2.3"; # 1.2.3
- $v = new version "v1.2.3"; # 1.2.3
- $v = new version "v1.0003"; # 1.3
-
-In additional to conventional versions, V-String Versions can be
-used to create L<Beta Versions>.
-
-In general, V-String Versions permit the greatest amount of freedom
-to specify a version, whereas Numeric Versions enforce a certain
-uniformity. See also L<New Operator> for an additional method of
-initializing version objects.
-
-=head2 Object Methods
-
-Overloading has been used with version objects to provide a natural
-interface for their use. All mathematical operations are forbidden,
-since they don't make any sense for versions.
-
-=over 4
-
-=item * New Operator - Like all OO interfaces, the new() operator is
-used to initialize version objects. One way to increment versions
-when programming is to use the CVS variable $Revision, which is
-automatically incremented by CVS every time the file is committed to
-the repository.
-
-=back
-
-In order to facilitate this feature, the following
-code can be employed:
-
- $VERSION = new version qw$Revision: 2.7 $;
-
-and the version object will be created as if the following code
-were used:
-
- $VERSION = new version "v2.6";
-
-In other words, the version will be automatically parsed out of the
-string, and it will be quoted to preserve the meaning CVS normally
-carries for versions.
-
-For the subsequent examples, the following two objects will be used:
-
- $ver = new version "1.2.3"; # see "Quoting" below
- $beta = new version "1.2_3"; # see "Beta versions" below
-
-=over 4
-
-=item * Stringification - Any time a version object is used as a string,
-a stringified representation is returned in reduced form (no extraneous
-zeros):
-
-=back
-
- print $ver->stringify; # prints 1.2.3
- print $ver; # same thing
-
-=over 4
-
-=item * Numification - although all mathematical operations on version
-objects are forbidden by default, it is possible to retrieve a number
-which roughly corresponds to the version object through the use of the
-$obj->numify method. For formatting purposes, when displaying a number
-which corresponds a version object, all sub versions are assumed to have
-three decimal places. So for example:
-
-=back
-
- print $ver->numify; # prints 1.002003
-
-=over 4
-
-=item * Comparison operators - Both cmp and <=> operators perform the
-same comparison between terms (upgrading to a version object
-automatically). Perl automatically generates all of the other comparison
-operators based on those two. In addition to the obvious equalities
-listed below, appending a single trailing 0 term does not change the
-value of a version for comparison purposes. In other words "v1.2" and
-"v1.2.0" are identical versions.
-
-=back
-
-For example, the following relations hold:
-
- As Number As String Truth Value
- --------- ------------ -----------
- $ver > 1.0 $ver gt "1.0" true
- $ver < 2.5 $ver lt true
- $ver != 1.3 $ver ne "1.3" true
- $ver == 1.2 $ver eq "1.2" false
- $ver == 1.2.3 $ver eq "1.2.3" see discussion below
- $ver == v1.2.3 $ver eq "v1.2.3" ditto
-
-In versions of Perl prior to the 5.9.0 development releases, it is not
-permitted to use bare v-strings in either form, due to the nature of Perl's
-parsing operation. After that version (and in the stable 5.10.0 release),
-v-strings can be used with version objects without problem, see L<"Quoting">
-for more discussion of this topic. In the case of the last two lines of
-the table above, only the string comparison will be true; the numerical
-comparison will test false. However, you can do this:
-
- $ver == "1.2.3" or $ver == "v1.2.3" # both true
-
-even though you are doing a "numeric" comparison with a "string" value.
-It is probably best to chose either the numeric notation or the string
-notation and stick with it, to reduce confusion. See also L<"Quoting">.
-
-=head2 Quoting
-
-Because of the nature of the Perl parsing and tokenizing routines,
-certain initialization values B<must> be quoted in order to correctly
-parse as the intended version, and additionally, some initial values
-B<must not> be quoted to obtain the intended version.
-
-Except for L<Beta versions>, any version initialized with something
-that looks like a number (a single decimal place) will be parsed in
-the same way whether or not the term is quoted. In order to be
-compatible with earlier Perl version styles, any use of versions of
-the form 5.006001 will be translated as 5.6.1. In other words, a
-version with a single decimal place will be parsed as implicitly
-having three places between subversions.
-
-The complicating factor is that in bare numbers (i.e. unquoted), the
-underscore is a legal numeric character and is automatically stripped
-by the Perl tokenizer before the version code is called. However, if
-a number containing a single decimal and an underscore is quoted, i.e.
-not bare, that is considered a L<Beta Version> and the underscore is
-significant.
-
-If you use a mathematic formula that resolves to a floating point number,
-you are dependent on Perl's conversion routines to yield the version you
-expect. You are pretty safe by dividing by a power of 10, for example,
-but other operations are not likely to be what you intend. For example:
-
- $VERSION = new version (qw$Revision: 1.4)[1]/10;
- print $VERSION; # yields 0.14
- $V2 = new version 100/9; # Integer overflow in decimal number
- print $V2; # yields 11_1285418553
-
-Perl 5.9.0 and beyond will be able to automatically quote v-strings
-(which may become the recommended notation), but that is not possible in
-earlier versions of Perl. In other words:
-
- $version = new version "v2.5.4"; # legal in all versions of Perl
- $newvers = new version v2.5.4; # legal only in Perl > 5.9.0
-
-
-=head2 Types of Versions Objects
-
-There are two types of Version Objects:
-
-=over 4
-
-=item * Ordinary versions - These are the versions that normal
-modules will use. Can contain as many subversions as required.
-In particular, those using RCS/CVS can use one of the following:
-
-=back
-
- $VERSION = new version qw$Revision: 2.7 $;
-
-and the current RCS Revision for that file will be inserted
-automatically. If the file has been moved to a branch, the
-Revision will have three or more elements; otherwise, it will
-have only two. This allows you to automatically increment
-your module version by using the Revision number from the primary
-file in a distribution, see L<ExtUtils::MakeMaker/"VERSION_FROM">.
-
-=over 4
-
-=item * Beta versions - For module authors using CPAN, the
-convention has been to note unstable releases with an underscore
-in the version string, see L<CPAN>. Beta releases will test as being
-newer than the more recent stable release, and less than the next
-stable release. For example:
-
-=back
-
- $betaver = new version "12.3_1"; # must quote
-
-obeys the relationship
-
- 12.3 < $betaver < 12.4
-
-As a matter of fact, if is also true that
-
- 12.3.0 < $betaver < 12.3.1
-
-where the subversion is identical but the beta release is less than
-the non-beta release.
-
-=head2 Replacement UNIVERSAL::VERSION
-
-In addition to the version objects, this modules also replaces the core
-UNIVERSAL::VERSION function with one that uses version objects for its
-comparisons.
-
-=head1 EXPORT
-
-None by default.
-
-=head1 AUTHOR
-
-John Peacock E<lt>jpeacock@rowman.comE<gt>
-
-=head1 SEE ALSO
-
-L<perl>.
-
-=cut
https://perl5.git.perl.org / perl5.git / blobdiff