Version.pm

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Author : Stefano Lattarini
Date : 2012-02-23 20:25:26
Hash : 3e887a13
Message : pm: do not quote `like this', as per GCS recommendation This patch converts the internal perl modules used by automake and aclocal to the use of new quoting format 'like this' or "like this" rather than `like this'. * lib/Automake/ChannelDefs.pm, lib/Automake/Channels.pm, lib/Automake/Condition.pm, lib/Automake/Configure_ac.pm, lib/Automake/DisjConditions.pm, lib/Automake/FileUtils.pm, lib/Automake/General.pm, lib/Automake/Item.pm, lib/Automake/Rule.pm, lib/Automake/Getopt.pm, lib/Automake/Options.pm, lib/Automake/Struct.pm, lib/Automake/VarDef.pm, lib/Automake/Variable.pm, lib/Automake/Version.pm, lib/Automake/XFile.pm: Update and adjust quoting format throughout, in comments and diagnostic. Some minor related rewordings and reformatting since we are at it.

lib/Automake/Version.pm

# Copyright (C) 2001-2012 Free Software Foundation, Inc.

# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2, or (at your option)
# any later version.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

package Automake::Version;
use strict;
use Automake::ChannelDefs;

=head1 NAME

Automake::Version - version comparison

=head1 SYNOPSIS

  use Automake::Version;

  print "Version $version is older than required version $required\n"
    if Automake::Version::check ($version, $required);

=head1 DESCRIPTION

This module provides support for comparing versions string
as they are used in Automake.

A version is a string that looks like
C<MAJOR.MINOR[.MICRO][ALPHA][-FORK]> where C<MAJOR>, C<MINOR>, and
C<MICRO> are digits, C<ALPHA> is a character, and C<FORK> any
alphanumeric word.

Usually, C<ALPHA> is used to label alpha releases or intermediate
snapshots, C<FORK> is used for git branches or patched releases, and
C<MICRO> is used for bug fixes releases on the C<MAJOR.MINOR> branch.

For the purpose of ordering, C<1.4> is the same as C<1.4.0>, but
C<1.4g> is the same as C<1.4.99g>.  The C<FORK> identifier is ignored
in the ordering, except when it looks like C<-pMINOR[ALPHA]>: some
versions were labeled like C<1.4-p3a>, this is the same as an alpha
release labeled C<1.4.3a>.  Yes, it's horrible, but Automake did not
support two-dot versions in the past.

=head2 FUNCTIONS

=over 4

=item C<split ($version)>

Split the string C<$version> into the corresponding C<(MAJOR, MINOR,
MICRO, ALPHA, FORK)> tuple.  For instance C<'1.4g'> would be split
into C<(1, 4, 99, 'g', '')>.  Return C<()> on error.

=cut

sub split ($)
{
  my ($ver) = @_;

  # Special case for versions like 1.4-p2a.
  if ($ver =~ /^(\d+)\.(\d+)(?:-p(\d+)([a-z]+)?)$/)
  {
    return ($1, $2, $3, $4 || '', '');
  }
  # Common case.
  elsif ($ver =~ /^(\d+)\.(\d+)(?:\.(\d+))?([a-z])?(?:-([A-Za-z0-9]+))?$/)
  {
    return ($1, $2, $3 || (defined $4 ? 99 : 0), $4 || '', $5 || '');
  }
  return ();
}

=item C<compare (\@LVERSION, \@RVERSION)>

Compare two version tuples, as returned by C<split>.

Return 1, 0, or -1, if C<LVERSION> is found to be respectively
greater than, equal to, or less than C<RVERSION>.

=cut

sub compare (\@\@)
{
  my @l = @{$_[0]};
  my @r = @{$_[1]};

  for my $i (0, 1, 2)
  {
    return 1  if ($l[$i] > $r[$i]);
    return -1 if ($l[$i] < $r[$i]);
  }
  for my $i (3, 4)
  {
    return 1  if ($l[$i] gt $r[$i]);
    return -1 if ($l[$i] lt $r[$i]);
  }
  return 0;
}

=item C<check($VERSION, $REQUIRED)>

Handles the logic of requiring a version number in Automake.
C<$VERSION> should be Automake's version, while C<$REQUIRED>
is the version required by the user input.

Return 0 if the required version is satisfied, 1 otherwise.

=cut

sub check ($$)
{
  my ($version, $required) = @_;
  my @version = Automake::Version::split ($version);
  my @required = Automake::Version::split ($required);

  prog_error "version is incorrect: $version"
    if $#version == -1;

  # This should not happen, because process_option_list and split_version
  # use similar regexes.
  prog_error "required version is incorrect: $required"
    if $#required == -1;

  # If we require 3.4n-foo then we require something
  # >= 3.4n, with the 'foo' fork identifier.
  return 1
    if ($required[4] ne '' && $required[4] ne $version[4]);

  return 0 > compare (@version, @required);
}

1;

### Setup "GNU" style for perl-mode and cperl-mode.
## Local Variables:
## perl-indent-level: 2
## perl-continued-statement-offset: 2
## perl-continued-brace-offset: 0
## perl-brace-offset: 0
## perl-brace-imaginary-offset: 0
## perl-label-offset: -2
## cperl-indent-level: 2
## cperl-brace-offset: 0
## cperl-continued-brace-offset: 0
## cperl-label-offset: -2
## cperl-extra-newline-before-brace: t
## cperl-merge-trailing-else: nil
## cperl-continued-statement-offset: 2
## End:

kc3-lang/automake/lib/Automake/Version.pm

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kc3-lang/automake /lib/Automake/Version.pm