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        my $t = sprintf '%02d/%s/%04d:%02d:%02d:%02d %s', $lt[3], $abbr[$lt[4]], $lt[5]+1900,
          $lt[2], $lt[1], $lt[0], $c->{tz_cache};
        q!~ . $fmt . q~!
    }~;
    my $code_ref = eval $fmt; ## no critic
    die $@ . "\n===\n" . $fmt if $@;
    wantarray ? ($code_ref, $fmt) : $code_ref;
}

sub log_line {
    my $self = shift;
    $self->[0]->(@_) . "\n";
}

sub code {
    my $self = shift;
    $self->[1];
}

sub code_ref {
    my $self = shift;
    $self->[0];
}

1;
__END__

=encoding utf8

=head1 NAME

Apache::LogFormat::Compiler - Compile a log format string to perl-code 

=head1 SYNOPSIS

  use Apache::LogFormat::Compiler;

  my $log_handler = Apache::LogFormat::Compiler->new("combined");
  my $log = $log_handler->log_line(
      $env,
      $res,
      $length,
      $reqtime,
      $time
  );

=head1 DESCRIPTION

Compile a log format string to perl-code. For faster generation of access_log lines.

=head1 METHOD

=over 4

=item new($fmt:String)

Takes a format string (or a preset template C<combined> or C<custom>)
to specify the log format. This module implements a subset of
L<Apache's LogFormat templates|http://httpd.apache.org/docs/2.0/mod/mod_log_config.html>:

   %%    a percent sign
   %h    REMOTE_ADDR from the PSGI environment, or -
   %l    remote logname not implemented (currently always -)
   %u    REMOTE_USER from the PSGI environment, or -
   %t    [local timestamp, in default format]
   %r    REQUEST_METHOD, REQUEST_URI and SERVER_PROTOCOL from the PSGI environment
   %s    the HTTP status code of the response
   %b    content length of the response
   %T    custom field for handling times in subclasses
   %D    custom field for handling sub-second times in subclasses
   %v    SERVER_NAME from the PSGI environment, or -
   %V    HTTP_HOST or SERVER_NAME from the PSGI environment, or -
   %p    SERVER_PORT from the PSGI environment
   %P    the worker's process id
   %m    REQUEST_METHOD from the PSGI environment
   %U    PATH_INFO from the PSGI environment
   %q    QUERY_STRING from the PSGI environment
   %H    SERVER_PROTOCOL from the PSGI environment

In addition, custom values can be referenced, using C<%{name}>,
with one of the mandatory modifier flags C<i>, C<o> or C<t>:

   %{variable-name}i    HTTP_VARIABLE_NAME value from the PSGI environment
   %{header-name}o      header-name header in the response
   %{time-format]t      localtime in the specified strftime format

=item log_line($env:HashRef, $res:ArrayRef, $length:Integer, $reqtime:Integer, $time:Integer): $log:String

Generates log line.

  $env      PSGI env request HashRef
  $res      PSGI response ArrayRef
  $length   Content-Length
  $reqtime  The time taken to serve request in microseconds. optional
  $time     Time the request was received. optional. If $time is undefined. current timestamp is used.

Sample psgi 

  use Plack::Builder;
  use Time::HiRes;
  use Apache::LogFormat::Compiler;

  my $log_handler = Apache::LogFormat::Compiler->new(
      '%h %l %u %t "%r" %>s %b "%{Referer}i" "%{User-agent}i" %D'
  );
  my $compile_log_app = builder {
      enable sub {
          my $app = shift;
          sub {
              my $env = shift;
              my $t0 = [gettimeofday];
              my $res = $app->();
              my $reqtime = int(Time::HiRes::tv_interval($t0) * 1_000_000);
              $env->{psgi.error}->print($log_handler->log_line(
                  $env,$res,6,$reqtime, $t0->[0]));
          }
      };
      $app
  };

=back