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|
package inc::LeapSecondsHeader;
use strict;
use warnings;
use namespace::autoclean;
use autodie;
my $VERSION = 0.04;
use Dist::Zilla::File::InMemory;
use Moose;
has _leap_second_data => (
traits => ['Array'],
is => 'bare',
isa => 'ArrayRef',
lazy => 1,
builder => '_build_leap_second_data',
handles => { _leap_second_data => 'elements' },
);
with 'Dist::Zilla::Role::FileGatherer';
sub gather_files {
my $self = shift;
$self->add_file(
Dist::Zilla::File::InMemory->new(
name => 'leap_seconds.h',
encoding => 'bytes',
content => $self->_header,
),
);
}
my $x = 1;
my %months = map { $_ => $x++ }
qw( Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec );
sub _build_leap_second_data {
my $self = shift;
my @steps;
open my $fh, '<', 'leaptab.txt' or die $!;
while (<$fh>) {
my ( $year, $mon, $day, $leap_seconds ) = split /\s+/;
$mon =~ s/\W//;
my $utc_epoch = _ymd2rd( $year, $months{$mon}, $day );
push @steps, [ $utc_epoch => $leap_seconds ];
}
close $fh;
return \@steps;
}
sub _macro_lines {
join "\n", map { sprintf( ' %-37s\\', $_ ) } @_;
}
sub set_leap_seconds {
my $self = shift;
# The most recent leaps have a higher chance to match
my $count = 0;
my @checks = "$count;";
foreach my $step ( $self->_leap_second_data ) {
$count += $step->[1];
unshift @checks, "utc_rd >= $step->[0] ? $count :";
}
my $checks = _macro_lines(@checks);
return <<"__LEAP";
/* utc_rd must be a simple variable */
#define SET_LEAP_SECONDS(utc_rd, leaps) \\
(leaps) = \\
$checks\
__LEAP
}
sub set_extra_seconds {
my $self = shift;
my @checks;
foreach my $step ( $self->_leap_second_data ) {
push @checks, "case $step->[0]: es = $step->[1]; break;";
}
my $checks = _macro_lines(@checks);
return <<"__EXTRA_SECONDS";
#define SET_EXTRA_SECONDS(utc_rd, es) \\
switch (utc_rd +1) { \\
$checks\
default: es = 0; \\
}
__EXTRA_SECONDS
}
sub set_day_length {
my $self = shift;
my @checks;
foreach my $step ( $self->_leap_second_data ) {
push @checks, "case $step->[0]: dl = 86400 + $step->[1]; break;";
}
my $checks = _macro_lines(@checks);
return <<"__DAY_LENGTH";
#define SET_DAY_LENGTH(utc_rd, dl) \\
switch (utc_rd +1) { \\
$checks\
default: dl = 86400; \\
}
__DAY_LENGTH
}
sub _header {
my $self = shift;
my $generator = ref $self;
my $header = <<"__HEADER";
/*
This file is auto-generated by the leap second code generator ($VERSION). This
code generator comes with the DateTime.pm module distribution in the tools/
directory
Generated $generator.
Do not edit this file directly.
*/
__HEADER
return join "\n",
$header,
$self->set_leap_seconds,
$self->set_extra_seconds,
$self->set_day_length;
}
# from lib/DateTimePP.pm
sub _ymd2rd {
use integer;
my ( $y, $m, $d ) = @_;
my $adj;
# make month in range 3..14 (treat Jan & Feb as months 13..14 of
# prev year)
if ( $m <= 2 ) {
$y -= ( $adj = ( 14 - $m ) / 12 );
$m += 12 * $adj;
}
elsif ( $m > 14 ) {
$y += ( $adj = ( $m - 3 ) / 12 );
$m -= 12 * $adj;
}
# make year positive (oh, for a use integer 'sane_div'!)
if ( $y < 0 ) {
$d -= 146097 * ( $adj = ( 399 - $y ) / 400 );
$y += 400 * $adj;
}
# add: day of month, days of previous 0-11 month period that began
# w/March, days of previous 0-399 year period that began w/March
# of a 400-multiple year), days of any 400-year periods before
# that, and 306 days to adjust from Mar 1, year 0-relative to Jan
# 1, year 1-relative (whew)
$d
+= ( $m * 367 - 1094 ) / 12
+ $y % 100 * 1461 / 4
+ ( $y / 100 * 36524 + $y / 400 )
- 306;
}
__PACKAGE__->meta->make_immutable;
1;
|
