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timeseries
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Refactorization: get_ticks consists essentially of four parts: 

An computing the initial value, generating the label, computing the next
part, and a loop around the whole stuff. Extracted the loop from the
if-else cascade.
This commit is contained in:
hjp 2006-09-30 12:34:02 +00:00
parent 3d0b7f7cbe
commit 6833d0b350
1 changed files with 53 additions and 58 deletions
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111
TimeSeries.pm
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@ -31,8 +31,9 @@ use Time::Local;
use Data::Dumper;
use HTTP::Date qw(parse_date);
use Time::Local qw(timegm_nocheck);
use POSIX qw(strftime);
our $VERSION = do { my @r=(q$Revision: 1.16 $=~/\d+/g);sprintf "%d."."%02d"x$#r,@r};
our $VERSION = do { my @r=(q$Revision: 1.17 $=~/\d+/g);sprintf "%d."."%02d"x$#r,@r};
=head2 new(%opts)
@ -442,6 +443,9 @@ sub get_ticks {
my @ticks = ();
my $label;
my $nexttime;
if ($lasttime - $firsttime > 3 * 365 * 24 * 3600) {
# more than 3 years: 4 ticks/year
@ -450,16 +454,10 @@ sub get_ticks {
$mday = 1;
$mon = int($mon/3) * 3;
$firsttime = timelocal($sec,$min,$hour,$mday,$mon,$year);
my $time;
for (;;) {
$time = timelocal($sec,$min,$hour,$mday,$mon,$year);
push @ticks, [$time, sprintf('%04d-%02d-%02d', $year+1900, $mon+1, $mday)];
$mon += 3;
if ($mon >= 12) {
$mon -= 12; $year++;
}
if ($time > $lasttime) {last}
}
$label = '%Y-%m-%d';
$nexttime = sub { return add_months($_[0], 3) };
} elsif ($lasttime - $firsttime > 3 * 30 * 24 * 3600) {
# 3 to 36 months: 1 tick/month
@ -467,15 +465,10 @@ sub get_ticks {
$sec = $min = $hour = 0;
$mday = 1;
$firsttime = timelocal($sec,$min,$hour,$mday,$mon,$year);
my $time;
for (;;) {
$time = timelocal($sec,$min,$hour,$mday,$mon,$year);
push @ticks, [$time, sprintf('%04d-%02d-%02d', $year+1900, $mon+1, $mday)];
if (++$mon >= 12) {
$mon = 0; $year++;
}
if ($time > $lasttime) {last}
}
$label = '%Y-%m-%d';
$nexttime = sub { return add_months($_[0], 1) };
} elsif ($lasttime - $firsttime > 30 * 24 * 3600) {
# 30 ... 90 days: 1 tick/week.
@ -484,56 +477,42 @@ sub get_ticks {
($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst) = localtime($firsttime);
$sec = $min = $hour = 0;
my $time = $firsttime = timelocal($sec,$min,$hour,$mday,$mon,$year);
for (;;) {
($sec,$min,$hour,$mday,$mon,$year) = localtime($time);
push @ticks, [$time, sprintf('%04d-%02d-%02d', $year+1900, $mon+1, $mday)];
if ($time > $lasttime) {last}
$firsttime = timelocal($sec,$min,$hour,$mday,$mon,$year);
$time += 7 * 24 * 3600;
$time = dstcorr($time);
}
$label = '%Y-%m-%d';
$nexttime = sub { return dstcorr($_[0] + 7 * 24 * 3600) };
} elsif ($lasttime - $firsttime > 8 * 24 * 3600) {
# 8 .. 30 days: 1 tick per day.
my ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst) = localtime($firsttime);
$sec = $min = $hour = 0;
my $time = $firsttime = timelocal($sec,$min,$hour,$mday,$mon,$year);
for (;;) {
($sec,$min,$hour,$mday,$mon,$year) = localtime($time);
push @ticks, [$time, sprintf('%04d-%02d-%02d', $year+1900, $mon+1, $mday)];
if ($time > $lasttime) {last}
$firsttime = timelocal($sec,$min,$hour,$mday,$mon,$year);
$time += 24 * 3600;
$time = dstcorr($time);
}
$label = '%Y-%m-%d';
$nexttime = sub { return dstcorr($_[0] + 24 * 3600) };
} elsif ($lasttime - $firsttime > 2 * 24 * 3600) {
# 2 .. 8 days: 1 tick/4 hours
my ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst) = localtime($firsttime);
$sec = $min = $hour = 0;
my $time = $firsttime = timelocal($sec,$min,$hour,$mday,$mon,$year);
for (;;) {
($sec,$min,$hour,$mday,$mon,$year) = localtime($time);
push @ticks, [$time, sprintf('%04d-%02d-%02d %02d:%02d', $year+1900, $mon+1, $mday, $hour, $min)];
if ($time > $lasttime) {last}
$sec = $min = 0;
$hour = int($hour / 4) * 4;
$firsttime = timelocal($sec,$min,$hour,$mday,$mon,$year);
$time += 4 * 3600;
$time = dstcorr($time, 4 * 3600);
}
$label = '%Y-%m-%d %H:%M';
$nexttime = sub { return dstcorr($_[0] + 4 * 3600, 4 * 3600) };
} elsif ($lasttime - $firsttime > 6 * 3600) {
# 6 hours to 2 days: 1 tick per hour.
my ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst) = localtime($firsttime);
$sec = $min = 0;
my $time = $firsttime = timelocal($sec,$min,$hour,$mday,$mon,$year);
for (;;) {
($sec,$min,$hour,$mday,$mon,$year) = localtime($time);
push @ticks, [$time, sprintf('%04d-%02d-%02d %02d:%02d', $year+1900, $mon+1, $mday, $hour, $min)];
if ($time > $lasttime) {last}
$firsttime = timelocal($sec,$min,$hour,$mday,$mon,$year);
$time += 3600;
}
$label = '%Y-%m-%d %H:%M';
$nexttime = sub { return $_[0] + 3600 };
} else {
# less than 6 hours: 1 tick per minute.
# (ok, that's too much - need to find some intermediate steps,
@ -542,15 +521,31 @@ sub get_ticks {
my ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst) = localtime($firsttime);
$sec = 0;
my $time = $firsttime = timelocal($sec,$min,$hour,$mday,$mon,$year);
for (;;) {
($sec,$min,$hour,$mday,$mon,$year) = localtime($time);
push @ticks, [$time, sprintf('%04d-%02d-%02d %02d:%02d', $year+1900, $mon+1, $mday, $hour, $min)];
if ($time > $lasttime) {last}
$time += 60;
}
$label = '%Y-%m-%d %H:%M';
$nexttime = sub { return $_[0] + 60 };
}
my $time = $firsttime;
for (;;) {
push @ticks, [$time, strftime($label, localtime($time))];
if ($time > $lasttime) {last}
$time = $nexttime->($time);
}
return @ticks;
}
sub add_months {
my ($time, $d_mon) = @_;
my ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst)
= localtime($time);
$mon += $d_mon;
if ($mon >= 12) {
$mon -= 12; $year++;
}
$time = timelocal($sec,$min,$hour,$mday,$mon,$year);
};
1;