summaryrefslogtreecommitdiff
path: root/Master/tlpkg/tlperl/lib/version
diff options
context:
space:
mode:
authorNorbert Preining <preining@logic.at>2010-05-12 16:54:37 +0000
committerNorbert Preining <preining@logic.at>2010-05-12 16:54:37 +0000
commit661c41a09e39a182865e0b51e34cc995a0dc96e8 (patch)
tree2f79bb1406e22fdcb2587be8ffda6c0c609d7932 /Master/tlpkg/tlperl/lib/version
parentb645030efc22e13c2498a1522083634ab91b2de1 (diff)
move tlperl.straw to tlperl
git-svn-id: svn://tug.org/texlive/trunk@18210 c570f23f-e606-0410-a88d-b1316a301751
Diffstat (limited to 'Master/tlpkg/tlperl/lib/version')
-rwxr-xr-xMaster/tlpkg/tlperl/lib/version/Internals.pod608
-rwxr-xr-xMaster/tlpkg/tlperl/lib/version/vxs.pm28
2 files changed, 636 insertions, 0 deletions
diff --git a/Master/tlpkg/tlperl/lib/version/Internals.pod b/Master/tlpkg/tlperl/lib/version/Internals.pod
new file mode 100755
index 00000000000..5ff365e2762
--- /dev/null
+++ b/Master/tlpkg/tlperl/lib/version/Internals.pod
@@ -0,0 +1,608 @@
+=head1 NAME
+
+version::Internal - Perl extension for Version Objects
+
+=head1 DESCRIPTION
+
+Overloaded version objects for all modern versions of Perl. This documents
+the internal data representation and underlying code for version.pm. See
+L<version.pod> for daily usage. This document is only useful for users
+writing a subclass of version.pm or interested in the gory details.
+
+=head1 What IS a version
+
+For the purposes of this module, a version "number" is a sequence of
+positive integer values separated by one or more 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 kinds of version objects:
+
+=over 4
+
+=item * Decimal Versions
+
+Any version which "looks like a number", see L<Decimal Versions>. This
+also includes versions with a single decimal point and a single embedded
+underscore, see L<Decimal Alpha Versions>, even though these must be quoted
+to preserve the underscore formatting.
+
+=item * Dotted-Decimal Versions
+
+Also referred to as "Dotted-Integer", these contains more than one decimal
+point and may have an optional embedded underscore, see L<Dotted-Decimal
+Versions>. This is what is commonly used in most open source software as
+the "external" version (the one used as part of the tag or tarfile name).
+A leading 'v' character is now required and will warn if it missing.
+
+=back
+
+Both of these methods will produce similar version objects, in that
+the default stringification will yield the version L<Normal Form> only
+if required:
+
+ $v = version->new(1.002); # 1.002, but compares like 1.2.0
+ $v = version->new(1.002003); # 1.002003
+ $v2 = version->new("v1.2.3"); # v1.2.3
+
+In specific, version numbers initialized as L<Decimal Versions> will
+stringify as they were originally created (i.e. the same string that was
+passed to C<new()>. Version numbers initialized as L<Dotted-Decimal Versions>
+will be stringified as L<Normal Form>.
+
+=head2 Decimal Versions
+
+These correspond to historical versions of Perl itself prior to 5.6.0,
+as well as all other modules which follow the Camel rules for the
+$VERSION scalar. A Decimal 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, but only for
+purposes of comparison with other version objects. For example:
+
+ # Prints Equivalent to
+ $v = version->new( 1.2); # 1.2 v1.200.0
+ $v = version->new( 1.02); # 1.02 v1.20.0
+ $v = version->new( 1.002); # 1.002 v1.2.0
+ $v = version->new( 1.0023); # 1.0023 v1.2.300
+ $v = version->new( 1.00203); # 1.00203 v1.2.30
+ $v = version->new( 1.002003); # 1.002003 v1.2.3
+
+All of the preceding examples are true whether or not the input value is
+quoted. The important feature is that the input value contains only a
+single decimal. See also L<Alpha Versions> for how to handle
+
+IMPORTANT NOTE: As shown above, if your Decimal version contains more
+than 3 significant digits after the decimal place, it will be split on
+each multiple of 3, so 1.0003 is equivalent to v1.0.300, due to the need
+to remain compatible with Perl's own 5.005_03 == 5.5.30 interpretation.
+Any trailing zeros are ignored for mathematical comparison purposes.
+
+=head2 Dotted-Decimal Versions
+
+These are the newest form of versions, and correspond to Perl's own
+version style beginning with 5.6.0. Starting with Perl 5.10.0,
+and most likely Perl 6, this is likely to be the preferred form. This
+method normally requires that the input parameter be quoted, although
+Perl's after 5.8.1 can use v-strings as a special form of quoting, but
+this is highly discouraged.
+
+Unlike L<Decimal Versions>, Dotted-Decimal Versions have more than
+a single decimal point, e.g.:
+
+ # Prints
+ $v = version->new( "v1.200"); # v1.200.0
+ $v = version->new("v1.20.0"); # v1.20.0
+ $v = qv("v1.2.3"); # v1.2.3
+ $v = qv("1.2.3"); # v1.2.3
+ $v = qv("1.20"); # v1.20.0
+
+In general, Dotted-Decimal Versions permit the greatest amount of freedom
+to specify a version, whereas Decimal Versions enforce a certain
+uniformity. See also L<New Operator> for an additional method of
+initializing version objects.
+
+Just like L<Decimal Versions>, Dotted-Decimal Versions can be used as
+L<Alpha Versions>.
+
+=head2 Decimal Alpha Versions
+
+The one time that a Decimal version must be quoted is when a alpha form is
+used with an otherwise Decimal version (i.e. a single decimal point). This
+is commonly used for CPAN releases, where CPAN or CPANPLUS will ignore alpha
+versions for automatic updating purposes. Since some developers have used
+only two significant decimal places for their non-alpha releases, the
+version object will automatically take that into account if the initializer
+is quoted. For example Module::Example was released to CPAN with the
+following sequence of $VERSION's:
+
+ # $VERSION Stringified
+ 0.01 0.01
+ 0.02 0.02
+ 0.02_01 0.02_01
+ 0.02_02 0.02_02
+ 0.03 0.03
+ etc.
+
+The stringified form of Decimal versions will always be the same string
+that was used to initialize the version object.
+
+=head1 High level design
+
+=head2 version objects
+
+version.pm provides an overloaded version object that is designed to both
+encapsulate the author's intended $VERSION assignment as well as make it
+completely natural to use those objects as if they were numbers (e.g. for
+comparisons). To do this, a version object contains both the original
+representation as typed by the author, as well as a parsed representation
+to ease comparisons. Version objects employ L<overload> methods to
+simplify code that needs to compare, print, etc the objects.
+
+The internal structure of version objects is a blessed hash with several
+components:
+
+ bless( {
+ 'original' => 'v1.2.3_4',
+ 'alpha' => 1,
+ 'qv' => 1,
+ 'version' => [
+ 1,
+ 2,
+ 3,
+ 4
+ ]
+ }, 'version' );
+
+=over 4
+
+=item original
+
+A faithful representation of the value used to initialize this version
+object. The only time this will not be precisely the same characters
+that exist in the source file is if a short dotted-decimal version like
+v1.2 was used (in which case it will contain 'v1.2'). This form is
+B<STRONGLY> discouraged, in that it will confuse you and your users.
+
+=item qv
+
+A boolean that denotes whether this is a decimal or dotted-decimal version.
+See L<is_qv>.
+
+=item alpha
+
+A boolean that denotes whether this is an alpha version. NOTE: that the
+underscore can can only appear in the last position. See L<is_alpha>.
+
+=item version
+
+An array of non-negative integers that is used for comparison purposes with
+other version objects.
+
+=back
+
+=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. The return from this operator is always the stringified form
+as a simple scalar (i.e. not an object), but the warning message generated
+includes either the stringified form or the normal form, depending on how
+it was called.
+
+For example:
+
+ package Foo;
+ $VERSION = 1.2;
+
+ package Bar;
+ $VERSION = "v1.3.5"; # works with all Perl's (since it is quoted)
+
+ package main;
+ use version;
+
+ print $Foo::VERSION; # prints 1.2
+
+ print $Bar::VERSION; # prints 1.003005
+
+ eval "use foo 10";
+ print $@; # prints "foo version 10 required..."
+ eval "use foo 1.3.5; # work in Perl 5.6.1 or better
+ print $@; # prints "foo version 1.3.5 required..."
+
+ eval "use bar 1.3.6";
+ print $@; # prints "bar version 1.3.6 required..."
+ eval "use bar 1.004"; # note Decimal version
+ print $@; # prints "bar version 1.004 required..."
+
+
+IMPORTANT NOTE: This may mean that code which searches for a specific
+string (to determine whether a given module is available) may need to be
+changed. It is always better to use the built-in comparison implicit in
+C<use> or C<require>, rather than manually poking at C<class->VERSION>
+and then doing a comparison yourself.
+
+The replacement UNIVERSAL::VERSION, when used as a function, like this:
+
+ print $module->VERSION;
+
+will also exclusively return the stringified form. See L<Stringification>
+for more details.
+
+=head1 Usage question
+
+=head2 Using modules that use version.pm
+
+As much as possible, the version.pm module remains compatible with all
+current code. However, if your module is using a module that has defined
+C<$VERSION> using the version class, there are a couple of things to be
+aware of. For purposes of discussion, we will assume that we have the
+following module installed:
+
+ package Example;
+ use version; $VERSION = qv('1.2.2');
+ ...module code here...
+ 1;
+
+=over 4
+
+=item Decimal versions always work
+
+Code of the form:
+
+ use Example 1.002003;
+
+will always work correctly. The C<use> will perform an automatic
+C<$VERSION> comparison using the floating point number given as the first
+term after the module name (e.g. above 1.002.003). In this case, the
+installed module is too old for the requested line, so you would see an
+error like:
+
+ Example version 1.002003 (v1.2.3) required--this is only version 1.002002 (v1.2.2)...
+
+=item Dotted-Decimal version work sometimes
+
+With Perl >= 5.6.2, you can also use a line like this:
+
+ use Example 1.2.3;
+
+and it will again work (i.e. give the error message as above), even with
+releases of Perl which do not normally support v-strings (see L<What about
+v-strings> below). This has to do with that fact that C<use> only checks
+to see if the second term I<looks like a number> and passes that to the
+replacement L<UNIVERSAL::VERSION>. This is not true in Perl 5.005_04,
+however, so you are B<strongly encouraged> to always use a Decimal version
+in your code, even for those versions of Perl which support the Dotted-Decimal
+version.
+
+=back
+
+=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 base version objects. Consequently,
+there is no overloaded numification available. If you want to use a
+version object in a Decimal context for some reason, see the L<numify>
+object method.
+
+=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.
+
+In order to facilitate this feature, the following
+code can be employed:
+
+ $VERSION = version->new(qw$Revision: 2.7 $);
+
+and the version object will be created as if the following code
+were used:
+
+ $VERSION = version->new("v2.7");
+
+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. The CVS $Revision$ increments differently from
+Decimal versions (i.e. 1.10 follows 1.9), so it must be handled as if
+it were a L<Dotted-Decimal Version>.
+
+A new version object can be created as a copy of an existing version
+object, either as a class method:
+
+ $v1 = version->new(12.3);
+ $v2 = version->new($v1);
+
+or as an object method:
+
+ $v1 = version->new(12.3);
+ $v2 = $v1->new(12.3);
+
+and in each case, $v1 and $v2 will be identical. NOTE: if you create
+a new object using an existing object like this:
+
+ $v2 = $v1->new();
+
+the new object B<will not> be a clone of the existing object. In the
+example case, $v2 will be an empty object of the same type as $v1.
+
+=back
+
+=over 4
+
+=item * qv()
+
+An alternate way to create a new version object is through the exported
+qv() sub. This is not strictly like other q? operators (like qq, qw),
+in that the only delimiters supported are parentheses (or spaces). It is
+the best way to initialize a short version without triggering the floating
+point interpretation. For example:
+
+ $v1 = qv(1.2); # v1.2.0
+ $v2 = qv("1.2"); # also v1.2.0
+
+As you can see, either a bare number or a quoted string can usually
+be used interchangably, except in the case of a trailing zero, which
+must be quoted to be converted properly. For this reason, it is strongly
+recommended that all initializers to qv() be quoted strings instead of
+bare numbers.
+
+To prevent the C<qv()> function from being exported to the caller's namespace,
+either use version with a null parameter:
+
+ use version ();
+
+or just require version, like this:
+
+ require version;
+
+Both methods will prevent the import() method from firing and exporting the
+C<qv()> sub. This is true of subclasses of version as well, see
+L<SUBCLASSING> for details.
+
+=back
+
+For the subsequent examples, the following three objects will be used:
+
+ $ver = version->new("1.2.3.4"); # see "Quoting" below
+ $alpha = version->new("1.2.3_4"); # see "Alpha versions" below
+ $nver = version->new(1.002); # see "Decimal Versions" above
+
+=over 4
+
+=item * Normal Form
+
+For any version object which is initialized with multiple decimal
+places (either quoted or if possible v-string), or initialized using
+the L<qv()> operator, the stringified representation is returned in
+a normalized or reduced form (no extraneous zeros), and with a leading 'v':
+
+ print $ver->normal; # prints as v1.2.3.4
+ print $ver->stringify; # ditto
+ print $ver; # ditto
+ print $nver->normal; # prints as v1.2.0
+ print $nver->stringify; # prints as 1.002, see "Stringification"
+
+In order to preserve the meaning of the processed version, the
+normalized representation will always contain at least three sub terms.
+In other words, the following is guaranteed to always be true:
+
+ my $newver = version->new($ver->stringify);
+ if ($newver eq $ver ) # always true
+ {...}
+
+=back
+
+=over 4
+
+=item * Numification
+
+Although all mathematical operations on version objects are forbidden
+by default, it is possible to retrieve a number which 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:
+
+ print $ver->numify; # prints 1.002003004
+ print $nver->numify; # prints 1.002
+
+Unlike the stringification operator, there is never any need to append
+trailing zeros to preserve the correct version value.
+
+=back
+
+=over 4
+
+=item * Stringification
+
+The default stringification for version objects returns exactly the same
+string as was used to create it, whether you used C<new()> or C<qv()>,
+with one exception. The sole exception is if the object was created using
+C<qv()> and the initializer did not have two decimal places or a leading
+'v' (both optional), then the stringified form will have a leading 'v'
+prepended, in order to support round-trip processing.
+
+For example:
+
+ Initialized as Stringifies to
+ ============== ==============
+ version->new("1.2") 1.2
+ version->new("v1.2") v1.2
+ qv("1.2.3") 1.2.3
+ qv("v1.3.5") v1.3.5
+ qv("1.2") v1.2 ### exceptional case
+
+See also L<UNIVERSAL::VERSION>, as this also returns the stringified form
+when used as a class method.
+
+IMPORTANT NOTE: There is one exceptional cases shown in the above table
+where the "initializer" is not stringwise equivalent to the stringified
+representation. If you use the C<qv()> operator on a version without a
+leading 'v' B<and> with only a single decimal place, the stringified output
+will have a leading 'v', to preserve the sense. See the L<qv()> operator
+for more details.
+
+IMPORTANT NOTE 2: Attempting to bypass the normal stringification rules by
+manually applying L<numify()> and L<normal()> will sometimes yield
+surprising results:
+
+ print version->new(version->new("v1.0")->numify)->normal; # v1.0.0
+
+The reason for this is that the L<numify()> operator will turn "v1.0"
+into the equivalent string "1.000000". Forcing the outer version object
+to L<normal()> form will display the mathematically equivalent "v1.0.0".
+
+As the example in L<new()> shows, you can always create a copy of an
+existing version object with the same value by the very compact:
+
+ $v2 = $v1->new($v1);
+
+and be assured that both C<$v1> and C<$v2> will be completely equivalent,
+down to the same internal representation as well as stringification.
+
+=back
+
+=over 4
+
+=item * Comparison operators
+
+Both C<cmp> and C<E<lt>=E<gt>> 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 "1.2.0" will compare as identical.
+
+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 == 1.2.3.4 $ver eq "1.2.3.4" see discussion below
+
+It is probably best to chose either the Decimal notation or the string
+notation and stick with it, to reduce confusion. Perl6 version objects
+B<may> only support Decimal comparisons. See also L<Quoting>.
+
+WARNING: Comparing version with unequal numbers of decimal points (whether
+explicitly or implicitly initialized), may yield unexpected results at
+first glance. For example, the following inequalities hold:
+
+ version->new(0.96) > version->new(0.95); # 0.960.0 > 0.950.0
+ version->new("0.96.1") < version->new(0.95); # 0.096.1 < 0.950.0
+
+For this reason, it is best to use either exclusively L<Decimal Versions> or
+L<Dotted-Decimal Versions> with multiple decimal points.
+
+=back
+
+=over 4
+
+=item * Logical Operators
+
+If you need to test whether a version object
+has been initialized, you can simply test it directly:
+
+ $vobj = version->new($something);
+ if ( $vobj ) # true only if $something was non-blank
+
+You can also test whether a version object is an L<Alpha version>, for
+example to prevent the use of some feature not present in the main
+release:
+
+ $vobj = version->new("1.2_3"); # MUST QUOTE
+ ...later...
+ if ( $vobj->is_alpha ) # True
+
+=back
+
+=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, especially when using the L<qv()> operator.
+In all cases, a floating point number passed to version->new() will be
+identically converted whether or not the value itself is quoted. This is
+not true for L<qv()>, however, when trailing zeros would be stripped on
+an unquoted input, which would result in a very different version object.
+
+In addition, in order to be compatible with earlier Perl version styles,
+any use of versions of the form 5.006001 will be translated as v5.6.1.
+In other words, a version with a single decimal point will be parsed as
+implicitly having three digits between subversions, but only for internal
+comparison purposes.
+
+The complicating factor is that in bare numbers (i.e. unquoted), the
+underscore is a legal Decimal character and is automatically stripped
+by the Perl tokenizer before the version code is called. However, if
+a number containing one or more decimals and an underscore is quoted, i.e.
+not bare, that is considered a L<Alpha 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:
+
+ $VERSION = version->new((qw$Revision: 1.4)[1]/10);
+ print $VERSION; # yields 0.14
+ $V2 = version->new(100/9); # Integer overflow in decimal number
+ print $V2; # yields something like 11.111.111.100
+
+Perl 5.8.1 and beyond will be able to automatically quote v-strings but
+that is not possible in earlier versions of Perl. In other words:
+
+ $version = version->new("v2.5.4"); # legal in all versions of Perl
+ $newvers = version->new(v2.5.4); # legal only in Perl >= 5.8.1
+
+=head1 SUBCLASSING
+
+This module is specifically designed and tested to be easily subclassed.
+In practice, you only need to override the methods you want to change, but
+you have to take some care when overriding new() (since that is where all
+of the parsing takes place). For example, this is a perfect acceptable
+derived class:
+
+ package myversion;
+ use base version;
+ sub new {
+ my($self,$n)=@_;
+ my $obj;
+ # perform any special input handling here
+ $obj = $self->SUPER::new($n);
+ # and/or add additional hash elements here
+ return $obj;
+ }
+
+See also L<version::AlphaBeta> on CPAN for an alternate representation of
+version strings.
+
+B<NOTE:> Although the L<qv> operator is not a true class method, but rather a
+function exported into the caller's namespace, a subclass of version will
+inherit an import() function which will perform the correct magic on behalf
+of the subclass.
+
+=head1 EXPORT
+
+qv - Dotted-Decimal Version initialization operator
+
+=head1 AUTHOR
+
+John Peacock E<lt>jpeacock@cpan.orgE<gt>
+
+=head1 SEE ALSO
+
+L<perl>.
+
+=cut
diff --git a/Master/tlpkg/tlperl/lib/version/vxs.pm b/Master/tlpkg/tlperl/lib/version/vxs.pm
new file mode 100755
index 00000000000..ed4337e00ad
--- /dev/null
+++ b/Master/tlpkg/tlperl/lib/version/vxs.pm
@@ -0,0 +1,28 @@
+#!perl -w
+package version::vxs;
+
+use 5.005_03;
+use strict;
+
+use vars qw(@ISA $VERSION $CLASS );
+
+$VERSION = '0.80';
+$VERSION = eval $VERSION;
+
+$CLASS = 'version::vxs';
+
+eval {
+ require XSLoader;
+ local $^W; # shut up the 'redefined' warning for UNIVERSAL::VERSION
+ XSLoader::load('version::vxs', $VERSION);
+ 1;
+} or do {
+ require DynaLoader;
+ push @ISA, 'DynaLoader';
+ local $^W; # shut up the 'redefined' warning for UNIVERSAL::VERSION
+ bootstrap version::vxs $VERSION;
+};
+
+# Preloaded methods go here.
+
+1;