This file is indexed.

/usr/share/perl5/DateTime/Span.pm is in libdatetime-set-perl 0.31-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
# Copyright (c) 2003 Flavio Soibelmann Glock. All rights reserved.
# This program is free software; you can redistribute it and/or
# modify it under the same terms as Perl itself.

package DateTime::Span;

use strict;

use DateTime::Set;
use DateTime::SpanSet;

use Params::Validate qw( validate SCALAR BOOLEAN OBJECT CODEREF ARRAYREF );
use vars qw( $VERSION );

use constant INFINITY     => DateTime::INFINITY;
use constant NEG_INFINITY => DateTime::NEG_INFINITY;
$VERSION = $DateTime::Set::VERSION;

sub set_time_zone {
    my ( $self, $tz ) = @_;

    $self->{set} = $self->{set}->iterate( 
        sub {
            my %tmp = %{ $_[0]->{list}[0] };
            $tmp{a} = $tmp{a}->clone->set_time_zone( $tz ) if ref $tmp{a};
            $tmp{b} = $tmp{b}->clone->set_time_zone( $tz ) if ref $tmp{b};
            \%tmp;
        }
    );
    return $self;
}

# note: the constructor must clone its DateTime parameters, such that
# the set elements become immutable
sub from_datetimes {
    my $class = shift;
    my %args = validate( @_,
                         { start =>
                           { type => OBJECT,
                             optional => 1,
                           },
                           end =>
                           { type => OBJECT,
                             optional => 1,
                           },
                           after =>
                           { type => OBJECT,
                             optional => 1,
                           },
                           before =>
                           { type => OBJECT,
                             optional => 1,
                           },
                         }
                       );
    my $self = {};
    my $set;

    die "No arguments given to DateTime::Span->from_datetimes\n"
        unless keys %args;

    if ( exists $args{start} && exists $args{after} ) {
        die "Cannot give both start and after arguments to DateTime::Span->from_datetimes\n";
    }
    if ( exists $args{end} && exists $args{before} ) {
        die "Cannot give both end and before arguments to DateTime::Span->from_datetimes\n";
    }

    my ( $start, $open_start, $end, $open_end );
    ( $start, $open_start ) = ( NEG_INFINITY,  0 );
    ( $start, $open_start ) = ( $args{start},  0 ) if exists $args{start};
    ( $start, $open_start ) = ( $args{after},  1 ) if exists $args{after};
    ( $end,   $open_end   ) = ( INFINITY,      0 );
    ( $end,   $open_end   ) = ( $args{end},    0 ) if exists $args{end};
    ( $end,   $open_end   ) = ( $args{before}, 1 ) if exists $args{before};

    if ( $start > $end ) {
        die "Span cannot start after the end in DateTime::Span->from_datetimes\n";
    }
    $set = Set::Infinite::_recurrence->new( $start, $end );
    if ( $start != $end ) {
        # remove start, such that we have ">" instead of ">="
        $set = $set->complement( $start ) if $open_start;  
        # remove end, such that we have "<" instead of "<="
        $set = $set->complement( $end )   if $open_end;    
    }

    $self->{set} = $set;
    bless $self, $class;
    return $self;
}

sub from_datetime_and_duration {
    my $class = shift;
    my %args = @_;

    my $key;
    my $dt;
    # extract datetime parameters
    for ( qw( start end before after ) ) {
        if ( exists $args{$_} ) {
           $key = $_;
           $dt = delete $args{$_};
       }
    }

    # extract duration parameters
    my $dt_duration;
    if ( exists $args{duration} ) {
        $dt_duration = $args{duration};
    }
    else {
        $dt_duration = DateTime::Duration->new( %args );
    }
    # warn "Creating span from $key => ".$dt->datetime." and $dt_duration";
    my $other_date = $dt->clone->add_duration( $dt_duration );
    # warn "Creating span from $key => ".$dt->datetime." and ".$other_date->datetime;
    my $other_key;
    if ( $dt_duration->is_positive ) {
        # check if have to invert keys
        $key = 'after' if $key eq 'end';
        $key = 'start' if $key eq 'before';
        $other_key = 'before';
    }
    else {
        # check if have to invert keys
        $other_key = 'end' if $key eq 'after';
        $other_key = 'before' if $key eq 'start';
        $key = 'start';
    }
    return $class->new( $key => $dt, $other_key => $other_date ); 
}

# This method is intentionally not documented.  It's really only for
# use by ::Set and ::SpanSet's as_list() and iterator() methods.
sub new {
    my $class = shift;
    my %args = @_;

    # If we find anything _not_ appropriate for from_datetimes, we
    # assume it must be for durations, and call this constructor.
    # This way, we don't need to hardcode the DateTime::Duration
    # parameters.
    foreach ( keys %args )
    {
        return $class->from_datetime_and_duration(%args)
            unless /^(?:before|after|start|end)$/;
    }

    return $class->from_datetimes(%args);
}

sub is_empty_set {
    my $set = $_[0];
    $set->{set}->is_null;
}

sub clone { 
    bless { 
        set => $_[0]->{set}->copy,
        }, ref $_[0];
}

# Set::Infinite methods

sub intersection {
    my ($set1, $set2) = @_;
    my $class = ref($set1);
    my $tmp = {};  # $class->new();
    $set2 = $set2->as_spanset
        if $set2->can( 'as_spanset' );
    $set2 = $set2->as_set
        if $set2->can( 'as_set' );
    $set2 = DateTime::Set->from_datetimes( dates => [ $set2 ] ) 
        unless $set2->can( 'union' );
    $tmp->{set} = $set1->{set}->intersection( $set2->{set} );

    # intersection() can generate something more complex than a span.
    bless $tmp, 'DateTime::SpanSet';

    return $tmp;
}

sub intersects {
    my ($set1, $set2) = @_;
    my $class = ref($set1);
    $set2 = $set2->as_spanset
        if $set2->can( 'as_spanset' );
    $set2 = $set2->as_set
        if $set2->can( 'as_set' );
    $set2 = DateTime::Set->from_datetimes( dates => [ $set2 ] ) 
        unless $set2->can( 'union' );
    return $set1->{set}->intersects( $set2->{set} );
}

sub contains {
    my ($set1, $set2) = @_;
    my $class = ref($set1);
    $set2 = $set2->as_spanset
        if $set2->can( 'as_spanset' );
    $set2 = $set2->as_set
        if $set2->can( 'as_set' );
    $set2 = DateTime::Set->from_datetimes( dates => [ $set2 ] ) 
        unless $set2->can( 'union' );
    return $set1->{set}->contains( $set2->{set} );
}

sub union {
    my ($set1, $set2) = @_;
    my $class = ref($set1);
    my $tmp = {};   # $class->new();
    $set2 = $set2->as_spanset
        if $set2->can( 'as_spanset' );
    $set2 = $set2->as_set
        if $set2->can( 'as_set' );
    $set2 = DateTime::Set->from_datetimes( dates => [ $set2 ] ) 
        unless $set2->can( 'union' );
    $tmp->{set} = $set1->{set}->union( $set2->{set} );
 
    # union() can generate something more complex than a span.
    bless $tmp, 'DateTime::SpanSet';

    # # We have to check it's internal structure to find out.
    # if ( $#{ $tmp->{set}->{list} } != 0 ) {
    #    bless $tmp, 'Date::SpanSet';
    # }

    return $tmp;
}

sub complement {
    my ($set1, $set2) = @_;
    my $class = ref($set1);
    my $tmp = {};   # $class->new;
    if (defined $set2) {
        $set2 = $set2->as_spanset
            if $set2->can( 'as_spanset' );
        $set2 = $set2->as_set
            if $set2->can( 'as_set' );
        $set2 = DateTime::Set->from_datetimes( dates => [ $set2 ] ) 
            unless $set2->can( 'union' );
        $tmp->{set} = $set1->{set}->complement( $set2->{set} );
    }
    else {
        $tmp->{set} = $set1->{set}->complement;
    }

    # complement() can generate something more complex than a span.
    bless $tmp, 'DateTime::SpanSet';

    # # We have to check it's internal structure to find out.
    # if ( $#{ $tmp->{set}->{list} } != 0 ) {
    #    bless $tmp, 'Date::SpanSet';
    # }

    return $tmp;
}

sub start { 
    return DateTime::Set::_fix_datetime( $_[0]->{set}->min );
}

*min = \&start;

sub end { 
    return DateTime::Set::_fix_datetime( $_[0]->{set}->max );
}

*max = \&end;

sub start_is_open {
    # min_a returns info about the set boundary 
    my ($min, $open) = $_[0]->{set}->min_a;
    return $open;
}

sub start_is_closed { $_[0]->start_is_open ? 0 : 1 }

sub end_is_open {
    # max_a returns info about the set boundary 
    my ($max, $open) = $_[0]->{set}->max_a;
    return $open;
}

sub end_is_closed { $_[0]->end_is_open ? 0 : 1 }


# span == $self
sub span { @_ }

sub duration { 
    my $dur;

    local $@;
    eval {
        local $SIG{__DIE__};   # don't want to trap this (rt ticket 5434)
        $dur = $_[0]->end->subtract_datetime_absolute( $_[0]->start )
    };
    
    return $dur if defined $dur;

    return DateTime::Infinite::Future->new -
           DateTime::Infinite::Past->new;
}
*size = \&duration;

1;

__END__

=head1 NAME

DateTime::Span - Datetime spans

=head1 SYNOPSIS

    use DateTime;
    use DateTime::Span;

    $date1 = DateTime->new( year => 2002, month => 3, day => 11 );
    $date2 = DateTime->new( year => 2003, month => 4, day => 12 );
    $set2 = DateTime::Span->from_datetimes( start => $date1, end => $date2 );
    #  set2 = 2002-03-11 until 2003-04-12

    $set = $set1->union( $set2 );         # like "OR", "insert", "both"
    $set = $set1->complement( $set2 );    # like "delete", "remove"
    $set = $set1->intersection( $set2 );  # like "AND", "while"
    $set = $set1->complement;             # like "NOT", "negate", "invert"

    if ( $set1->intersects( $set2 ) ) { ...  # like "touches", "interferes"
    if ( $set1->contains( $set2 ) ) { ...    # like "is-fully-inside"

    # data extraction 
    $date = $set1->start;           # first date of the span
    $date = $set1->end;             # last date of the span

=head1 DESCRIPTION

C<DateTime::Span> is a module for handling datetime spans, otherwise
known as ranges or periods ("from X to Y, inclusive of all datetimes
in between").

This is different from a C<DateTime::Set>, which is made of individual
datetime points as opposed to a range. There is also a module
C<DateTime::SpanSet> to handle sets of spans.

=head1 METHODS

=over 4

=item * from_datetimes

Creates a new span based on a starting and ending datetime.

A 'closed' span includes its end-dates:

   $span = DateTime::Span->from_datetimes( start => $dt1, end => $dt2 );

An 'open' span does not include its end-dates:

   $span = DateTime::Span->from_datetimes( after => $dt1, before => $dt2 );

A 'semi-open' span includes one of its end-dates:

   $span = DateTime::Span->from_datetimes( start => $dt1, before => $dt2 );
   $span = DateTime::Span->from_datetimes( after => $dt1, end => $dt2 );

A span might have just a beginning date, or just an ending date.
These spans end, or start, in an imaginary 'forever' date:

   $span = DateTime::Span->from_datetimes( start => $dt1 );
   $span = DateTime::Span->from_datetimes( end => $dt2 );
   $span = DateTime::Span->from_datetimes( after => $dt1 );
   $span = DateTime::Span->from_datetimes( before => $dt2 );

You cannot give both a "start" and "after" argument, nor can you give
both an "end" and "before" argument.  Either of these conditions will
cause the C<from_datetimes()> method to die.

To summarize, a datetime passed as either "start" or "end" is included
in the span.  A datetime passed as either "after" or "before" is
excluded from the span.

=item * from_datetime_and_duration

Creates a new span.

   $span = DateTime::Span->from_datetime_and_duration( 
       start => $dt1, duration => $dt_dur1 );
   $span = DateTime::Span->from_datetime_and_duration( 
       after => $dt1, hours => 12 );

The new "end of the set" is I<open> by default.

=item * clone

This object method returns a replica of the given object.

=item * set_time_zone( $tz )

This method accepts either a time zone object or a string that can be
passed as the "name" parameter to C<< DateTime::TimeZone->new() >>.
If the new time zone's offset is different from the old time zone,
then the I<local> time is adjusted accordingly.

If the old time zone was a floating time zone, then no adjustments to
the local time are made, except to account for leap seconds.  If the
new time zone is floating, then the I<UTC> time is adjusted in order
to leave the local time untouched.

=item * duration

The total size of the set, as a C<DateTime::Duration> object, or as a
scalar containing infinity.

Also available as C<size()>.

=item * start

=item * end

First or last dates in the span.

It is possible that the return value from these methods may be a
C<DateTime::Infinite::Future> or a C<DateTime::Infinite::Past>xs object.

If the set ends C<before> a date C<$dt>, it returns C<$dt>. Note that
in this case C<$dt> is not a set element - but it is a set boundary.

=cut

# scalar containing either negative infinity
# or positive infinity.

=item * start_is_closed

=item * end_is_closed

Returns true if the first or last dates belong to the span ( begin <= x <= end ).

=item * start_is_open

=item * end_is_open

Returns true if the first or last dates are excluded from the span ( begin < x < end ).

=item * union

=item * intersection

=item * complement

Set operations may be performed not only with C<DateTime::Span>
objects, but also with C<DateTime::Set> and C<DateTime::SpanSet>
objects.  These set operations always return a C<DateTime::SpanSet>
object.

    $set = $span->union( $set2 );         # like "OR", "insert", "both"
    $set = $span->complement( $set2 );    # like "delete", "remove"
    $set = $span->intersection( $set2 );  # like "AND", "while"
    $set = $span->complement;             # like "NOT", "negate", "invert"

=item * intersects

=item * contains

These set functions return a boolean value.

    if ( $span->intersects( $set2 ) ) { ...  # like "touches", "interferes"
    if ( $span->contains( $dt ) ) { ...    # like "is-fully-inside"

These methods can accept a C<DateTime>, C<DateTime::Set>,
C<DateTime::Span>, or C<DateTime::SpanSet> object as an argument.

=back

=head1 SUPPORT

Support is offered through the C<datetime@perl.org> mailing list.

Please report bugs using rt.cpan.org

=head1 AUTHOR

Flavio Soibelmann Glock <fglock@gmail.com>

The API was developed together with Dave Rolsky and the DateTime Community.

=head1 COPYRIGHT

Copyright (c) 2003-2006 Flavio Soibelmann Glock. All rights reserved.
This program is free software; you can distribute it and/or modify it
under the same terms as Perl itself.

The full text of the license can be found in the LICENSE file
included with this module.

=head1 SEE ALSO

Set::Infinite

For details on the Perl DateTime Suite project please see
L<http://datetime.perl.org>.

=cut