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#!/usr/bin/perl -w
#
# Vzic - a program to convert Olson timezone database files into VZTIMEZONE
# files compatible with the iCalendar specification (RFC2445).
#
# Copyright (C) 2000-2001 Ximian, Inc.
# Copyright (C) 2003 Damon Chaplin.
#
# Author: Damon Chaplin <damon@gnome.org>
#
# 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 of the License, 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, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
#
#
# This reads the Olson timezone files, strips any comments, and outputs them
# in a very simple format with tab-separated fields. It is used to compare
# with the output of dump_zone_data() and dump_rule_data() to double-check
# that we have parsed the files correctly.
#
my $zones_fh = "zonesfile";
my $rules_fh = "rulesfile";
my %Rules;
if ($#ARGV != 0) {
die "Usage: $0 <OlsonDirectory>";
}
my $OLSON_DIR = $ARGV[0];
# We place output in subdirectories of the current directory.
my $OUTPUT_DIR = "zoneinfo";
if (! -d "$OUTPUT_DIR") {
mkdir ("$OUTPUT_DIR", 0777)
|| die "Can't create directory: $OUTPUT_DIR";
}
if (! -d "$OUTPUT_DIR/ZonesPerl") {
mkdir ("$OUTPUT_DIR/ZonesPerl", 0777)
|| die "Can't create directory: $OUTPUT_DIR/ZonesPerl";
}
if (! -d "$OUTPUT_DIR/RulesPerl") {
mkdir ("$OUTPUT_DIR/RulesPerl", 0777)
|| die "Can't create directory: $OUTPUT_DIR/RulesPerl";
}
&ReadOlsonFile ("africa");
&ReadOlsonFile ("antarctica");
&ReadOlsonFile ("asia");
&ReadOlsonFile ("australasia");
&ReadOlsonFile ("europe");
&ReadOlsonFile ("northamerica");
&ReadOlsonFile ("southamerica");
# These are backwards-compatability and weird stuff.
#&ReadOlsonFile ("backward");
#&ReadOlsonFile ("etcetera");
#&ReadOlsonFile ("leapseconds");
#&ReadOlsonFile ("pacificnew");
#&ReadOlsonFile ("solar87");
#&ReadOlsonFile ("solar88");
#&ReadOlsonFile ("solar89");
# We don't do this one since it is not useful and the use of '"' in the Zone
# line messes up our split() command.
#&ReadOlsonFile ("factory");
# We don't do this since the vzic program can't do it.
#&ReadOlsonFile ("systemv");
1;
sub ReadOlsonFile {
my ($file) = @_;
# print ("Reading olson file: $file\n");
open (OLSONFILE, "$OLSON_DIR/$file")
|| die "Can't open file: $file";
open ($zones_fh, ">$OUTPUT_DIR/ZonesPerl/$file")
|| die "Can't open file: $OUTPUT_DIR/ZonesPerl/$file";
open ($rules_fh, ">$OUTPUT_DIR/RulesPerl/$file")
|| die "Can't open file: $OUTPUT_DIR/RulesPerl/$file";
%Rules = ();
my $zone_continues = 0;
while (<OLSONFILE>) {
next if (m/^#/);
# '#' characters can appear in strings, but the Olson files don't use
# that feature at present so we treat all '#' as comments for now.
s/#.*//;
next if (m/^\s*$/);
if ($zone_continues) {
$zone_continues = &ReadZoneContinuationLine;
} elsif (m/^Rule\s/) {
&ReadRuleLine;
} elsif (m/^Zone\s/) {
$zone_continues = &ReadZoneLine;
} elsif (m/^Link\s/) {
# print "Link: $link_from, $link_to\n";
} elsif (m/^Leap\s/) {
# print "Leap\n";
} else {
die "Invalid line: $_";
}
}
# print ("Read olson file: $file\n");
foreach $key (sort (keys (%Rules))) {
print $rules_fh "$Rules{$key}"
}
close ($zones_fh);
close ($rules_fh);
close (OLSONFILE);
}
sub ReadZoneLine {
my ($zone, $name, $gmtoff, $rules_save, $format,
$until_year, $until_month, $until_day, $until_time, $remainder)
= split ' ', $_, 10;
return &ReadZoneLineCommon ($zone, $name, $gmtoff, $rules_save, $format,
$until_year, $until_month, $until_day,
$until_time);
}
sub ReadZoneContinuationLine {
my ($gmtoff, $rules_save, $format,
$until_year, $until_month, $until_day, $until_time, $remainder)
= split ' ', $_, 8;
return &ReadZoneLineCommon ("", "", $gmtoff, $rules_save, $format,
$until_year, $until_month, $until_day,
$until_time);
}
sub ReadZoneLineCommon {
my ($zone, $name, $gmtoff, $rules_save, $format,
$until_year, $until_month, $until_day, $until_time) = @_;
if (!defined ($until_year)) { $until_year = ""; }
if (!defined ($until_month)) { $until_month = ""; }
if (!defined ($until_day)) { $until_day = ""; }
if (!defined ($until_time)) { $until_time = ""; }
# A few of the gmtoffsets have an unnecessary :00 seconds.
$gmtoff =~ s/(\d+):(\d+):00/$1:$2/;
# Make sure the gmtoff does have minutes.
$gmtoff =~ s/^(-?\d+)$/$1:00/;
# Fix a few other bits so they all use the same format.
if ($gmtoff eq "0") { $gmtoff = "0:00"; }
$until_time =~ s/^0(\d):/$1:/;
if ($until_time eq "0:00") { $until_time = ""; }
if ($until_day eq "1" && $until_time eq "") { $until_day = ""; }
if ($until_month eq "Jan" && $until_day eq "" && $until_time eq "") {
$until_month = "";
}
# For Zone continuation lines we need to insert an extra TAB.
if (!$zone) { $zone = "\t" };
print $zones_fh "$zone\t$name\t$gmtoff\t$rules_save\t$format\t$until_year\t$until_month\t$until_day\t$until_time\n";
if (defined ($until_year) && $until_year) {
return 1;
} else {
return 0;
}
}
sub ReadRuleLine {
my ($rule, $name, $from, $to, $type, $in, $on, $at, $save, $letter_s,
$remainder) = split;
$at =~ s/(\d+:\d+):00/$1/;
$save =~ s/(\d+:\d+):00/$1/;
if ($save eq "0:00") { $save = "0"; }
$Rules{$name} .= "$rule\t$name\t$from\t$to\t$type\t$in\t$on\t$at\t$save\t$letter_s\n";
# print $rules_fh "$rule\t$name\t$from\t$to\t$type\t$in\t$on\t$at\t$save\t$letter_s\n";
}
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