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# Copyright 2007, 2008, 2009, 2010, 2011 Kevin Ryde |
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# This file is part of Tie-TZ. |
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# |
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# Tie-TZ is free software; you can redistribute it and/or modify it under |
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# the terms of the GNU General Public License as published by the Free |
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# Software Foundation; either version 3, or (at your option) any later |
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# version. |
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# |
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# Tie-TZ is distributed in the hope that it will be useful, but WITHOUT ANY |
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# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS |
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# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more |
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# details. |
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# |
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# You should have received a copy of the GNU General Public License along |
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# with Tie-TZ. If not, see . |
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package Time::TZ; |
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# require 5; |
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use strict; |
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use Carp; |
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use Tie::TZ; |
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use vars qw($VERSION); |
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# uncomment this to run the ### lines |
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#use Smart::Comments; |
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$VERSION = 9; |
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sub new { |
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my ($class, %self) = @_; |
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my $self = bless \%self, $class; |
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unless (delete $self{'defer'}) { |
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$self->tz; |
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} |
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return $self; |
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} |
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sub name { |
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my ($self) = @_; |
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return $self->{'name'}; |
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} |
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sub tz { |
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my ($self) = @_; |
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my $choose = delete $self->{'choose'}; |
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if ($choose) { |
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foreach (@$choose) { |
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if ($self->tz_known($_)) { |
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### Time-TZ choose: $_ |
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return ($self->{'tz'} = $_); |
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} |
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} |
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my $name = $self->name; |
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my $msg = "TZ" . (defined $name ? " '$name'" : '') |
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. ': no zone known to the system among: ' |
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. join(' ',@$choose); |
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if (defined (my $tz = delete $self->{'fallback'})) { |
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warn $msg,", using $tz instead\n"; |
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return ($self->{'tz'} = $tz); |
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} |
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croak $msg; |
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} |
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return $self->{'tz'}; |
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} |
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my %tz_known = (UTC => 1, GMT => 1); |
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my $zonedir; |
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sub tz_known { |
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my ($class_or_self, $tz) = @_; |
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### tz_known(): $tz |
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if (! defined $tz || $tz_known{$tz}) { |
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return 1; |
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} |
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# EST-10 or EST-10EDT etc |
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if ($tz =~ /^[A-Z]+[0-9+-]+([A-Z]+)?($|,)/) { |
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### yes, std+offset form |
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return 1; |
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} |
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{ |
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require File::Spec; |
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$zonedir ||= File::Spec->catdir (File::Spec->rootdir, |
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'usr','share','zoneinfo'); |
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my $filename = $tz; |
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$filename =~ s/^://; |
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$filename = File::Spec->rel2abs ($filename, $zonedir); |
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### $filename |
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if (-e $filename) { |
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### yes, file exists |
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return 1; |
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} |
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} |
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# any hour or minute different from GMT in any of 12 calendar months |
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my $timet = time(); |
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local $Tie::TZ::TZ = $tz; |
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foreach (1 .. 12) { |
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my $mon = $_; |
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my $delta = $mon * 30 * 86400; |
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my $t = $timet + $delta; |
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my ($l_sec,$l_min,$l_hour,$l_mday,$l_mon,$l_year,$l_wday,$l_yday,$l_isdst) |
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= localtime ($t); |
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my ($g_sec,$g_min,$g_hour,$g_mday,$g_mon,$g_year,$g_wday,$g_yday,$g_isdst) |
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= gmtime ($t); |
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if ($l_hour != $g_hour || $l_min != $g_min) { |
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### yes, different from GMT in mon: $mon |
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0
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return 1; |
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} |
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} |
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### no |
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return 0; |
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} |
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sub localtime { |
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my ($self, $timet) = @_; |
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if (! defined $timet) { $timet = time(); } |
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local $Tie::TZ::TZ = $self->tz; |
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return localtime ($timet); |
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} |
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sub call { |
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my $self = shift; |
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my $subr = shift; |
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local $Tie::TZ::TZ = $self->tz; |
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return &$subr(@_); |
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} |
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1; |
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__END__ |