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package Data::Pageset::Exponential; |
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3
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# ABSTRACT: Page numbering for very large page numbers |
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5
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1927
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use v5.10.1; |
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6
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1324
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use Moo; |
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17977
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10
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3792
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use List::Util 1.33 qw/ all min /; |
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46
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246
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1145
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use PerlX::Maybe; |
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6156
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3
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1321
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use POSIX qw/ ceil floor /; |
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15809
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4632
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use MooX::Aliases; |
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13035
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3
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1913
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use MooX::TypeTiny; |
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736
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16
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25291
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use Types::Common 2.000000 qw/ is_Int Int ArrayRef is_HashRef PositiveOrZeroInt PositiveInt /; |
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738048
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3
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3
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12392
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use asa 'Data::Page'; |
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633
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17
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18
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19
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3
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1348
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use namespace::autoclean; |
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45799
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3
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13
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20
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21
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# RECOMMEND PREREQ: Type::Tiny::XS |
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# RECOMMEND PREREQ: Ref::Util::XS |
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24
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our $VERSION = 'v0.3.3'; |
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26
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has total_entries => ( |
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is => 'rw', |
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isa => PositiveOrZeroInt, |
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default => 0, |
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); |
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33
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34
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has entries_per_page => ( |
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is => 'rw', |
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isa => PositiveInt, |
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default => 10, |
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); |
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40
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41
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has first_page => ( |
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is => 'ro', |
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isa => Int, |
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default => 1, |
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); |
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47
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48
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has current_page => ( |
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is => 'rw', |
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isa => Int, |
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lazy => 1, |
52
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default => \&first_page, |
53
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coerce => sub { floor( $_[0] // 0 ) }, |
54
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); |
55
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56
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57
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has exponent_base => ( |
58
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is => 'ro', |
59
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isa => PositiveInt, |
60
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default => 10, |
61
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); |
62
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63
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64
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has exponent_max => ( |
65
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is => 'ro', |
66
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isa => PositiveInt, |
67
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default => 3, |
68
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); |
69
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70
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71
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has pages_per_exponent => ( |
72
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is => 'ro', |
73
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isa => PositiveInt, |
74
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default => 3, |
75
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); |
76
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77
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78
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has pages_per_set => ( |
79
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is => 'lazy', |
80
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isa => PositiveInt, |
81
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alias => 'max_pages_per_set', |
82
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builder => sub { |
83
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1
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1
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677
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my ($self) = @_; |
84
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3
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3
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2003
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use integer; |
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3
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66
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3
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15
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85
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1
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6
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my $n = $self->pages_per_exponent * ( $self->exponent_max + 1 ); |
86
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1
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15
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return ($n - 1) * 2 + 1; |
87
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}, |
88
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); |
89
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90
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91
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has series => ( |
92
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is => 'lazy', |
93
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isa => ArrayRef [Int], |
94
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builder => sub { |
95
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1
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1
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10
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my ($self) = @_; |
96
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97
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3
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3
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344
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use integer; |
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3
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9
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3
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10
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98
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99
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1
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1
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my @series; |
100
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101
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1
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5
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my $n = $self->exponent_base; |
102
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1
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3
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my $m = $self->exponent_max; |
103
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104
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1
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3
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my $j = 0; |
105
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1
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4
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while ( $j <= $m ) { |
106
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107
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4
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6
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my $i = $n**$j; |
108
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4
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6
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my $a = $i; |
109
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4
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9
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my $p = $self->pages_per_exponent; |
110
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111
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4
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7
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while ( $p-- ) { |
112
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12
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14
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push @series, $a - 1; |
113
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12
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22
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$a += $i; |
114
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} |
115
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116
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4
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8
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$j++; |
117
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118
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} |
119
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120
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1
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3
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my @prevs = map { -$_ } reverse @series[1..$#series]; |
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11
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16
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121
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122
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123
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1
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17
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return [@prevs, @series]; |
124
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}, |
125
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); |
126
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127
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around current_page => sub { |
128
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my $next = shift; |
129
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my $self = shift; |
130
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131
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# N.B. unlike Data::Page, setting a value outside the first_page |
132
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# or last_page will not return that value. |
133
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134
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my $page = $self->$next(@_); |
135
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136
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return $self->first_page if $page < $self->first_page; |
137
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138
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return $self->last_page if $page > $self->last_page; |
139
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140
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return $page; |
141
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}; |
142
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143
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144
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sub entries_on_this_page { |
145
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71
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71
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1
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40187
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my ($self) = @_; |
146
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147
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71
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100
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1442
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if ( $self->total_entries ) { |
148
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68
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462
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return $self->last - $self->first + 1; |
149
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} |
150
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else { |
151
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3
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29
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return 0; |
152
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} |
153
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} |
154
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155
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156
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sub last_page { |
157
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1558
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1558
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1
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82908
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my ($self) = @_; |
158
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1558
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100
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20806
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return $self->total_entries |
159
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? ceil( $self->total_entries / $self->entries_per_page ) |
160
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: $self->first_page; |
161
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} |
162
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163
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164
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sub first { |
165
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386
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386
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1
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40138
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my ($self) = @_; |
166
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386
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100
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5482
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if ( $self->total_entries ) { |
167
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380
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7177
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return ( $self->current_page - 1 ) * $self->entries_per_page + 1; |
168
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} |
169
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else { |
170
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6
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54
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return 0; |
171
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} |
172
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} |
173
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174
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175
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sub last { |
176
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211
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211
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1
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38177
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my ($self) = @_; |
177
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211
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100
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4267
|
if ( $self->current_page == $self->last_page ) { |
178
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121
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2302
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return $self->total_entries; |
179
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} |
180
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else { |
181
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90
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1865
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return $self->current_page * $self->entries_per_page; |
182
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} |
183
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} |
184
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185
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186
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sub previous_page { |
187
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71
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71
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1
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39209
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my ($self) = @_; |
188
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71
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1512
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my $page = $self->current_page; |
189
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190
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71
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100
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373
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return $page > $self->first_page |
191
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? $page - 1 |
192
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: undef; |
193
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} |
194
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195
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196
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sub next_page { |
197
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71
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71
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1
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133
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my ($self) = @_; |
198
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71
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1532
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my $page = $self->current_page; |
199
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200
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71
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100
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139
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return $page < $self->last_page |
201
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? $page + 1 |
202
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: undef; |
203
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} |
204
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205
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206
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sub splice { |
207
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72
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72
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0
|
608
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my ( $self, $items ) = @_; |
208
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209
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72
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163
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my $last = min( $self->last, scalar(@$items) ); |
210
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211
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return $last |
212
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72
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100
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726
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? @{$items}[ $self->first - 1 .. $last - 1 ] |
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68
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709
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213
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: (); |
214
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} |
215
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216
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217
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sub skipped { |
218
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71
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71
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0
|
38871
|
my ($self) = @_; |
219
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71
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return $self->total_entries |
220
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? $self->first - 1 |
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: 0; |
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} |
223
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224
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# Ideally, we'd use a trigger instead, but Moo does not pass the old |
225
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# value to a trigger. |
226
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around entries_per_page => sub { |
228
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my $next = shift; |
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my $self = shift; |
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if (@_) { |
232
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my $value = shift; |
234
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my $first = $self->first; |
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$self->$next($value); |
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$self->current_page( $self->first_page + $first / $value ); |
240
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return $value; |
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} |
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else { |
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return $self->$next; |
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} |
248
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}; |
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250
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sub pages_in_set { |
252
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my ($self) = @_; |
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254
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3
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2238
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use integer; |
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35
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3
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15
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255
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256
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8
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my $first = $self->first_page; |
257
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2
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5
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my $last = $self->last_page; |
258
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2
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42
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my $page = $self->current_page; |
259
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260
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return [ |
261
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46
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100
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grep { $first <= $_ && $_ <= $last } |
262
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3
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map { $page + $_ } @{ $self->series } |
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46
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65
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2
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27
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263
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]; |
264
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} |
265
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266
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267
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sub previous_set { |
268
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1
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4
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my ($self) = @_; |
269
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270
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2
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44
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my $page = $self->current_page - (2 * $self->pages_per_exponent) - 1; |
271
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2
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100
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10
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return $page < $self->first_page |
272
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? undef |
273
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: $page; |
274
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} |
275
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276
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277
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sub next_set { |
278
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2
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2
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1
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6
|
my ($self) = @_; |
279
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280
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2
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43
|
my $page = $self->current_page + (2 * $self->pages_per_exponent) - 1; |
281
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2
|
50
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4
|
return $page > $self->last_page |
282
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? undef |
283
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: $page; |
284
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} |
285
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286
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287
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|
sub change_entries_per_page { |
288
|
70
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70
|
0
|
38377
|
my ($self, $value) = @_; |
289
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290
|
70
|
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|
|
1588
|
$self->entries_per_page($value); |
291
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292
|
70
|
|
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|
|
1098
|
return $self->current_page; |
293
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|
} |
294
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295
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296
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|
sub BUILDARGS { |
297
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|
|
my ( $class, @args ) = @_; |
298
|
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299
|
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|
|
if (@args == 1 && is_HashRef(@args)) { |
300
|
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|
|
return $args[0]; |
301
|
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|
|
} |
302
|
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303
|
|
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|
|
if ( @args && ( @args <= 3 ) && all { is_Int($_) } @args ) { |
304
|
|
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|
|
|
305
|
|
|
|
|
|
|
return { |
306
|
|
|
|
|
|
|
total_entries => $args[0], |
307
|
|
|
|
|
|
|
maybe entries_per_page => $args[1], |
308
|
|
|
|
|
|
|
maybe current_page => $args[2], |
309
|
|
|
|
|
|
|
}; |
310
|
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|
|
|
311
|
|
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|
|
|
|
} |
312
|
|
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|
|
313
|
|
|
|
|
|
|
return {@args}; |
314
|
|
|
|
|
|
|
} |
315
|
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316
|
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317
|
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|
|
1; |
318
|
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319
|
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|
|
|
|
__END__ |
320
|
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|
321
|
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|
|
=pod |
322
|
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|
323
|
|
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|
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|
|
=encoding UTF-8 |
324
|
|
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|
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|
325
|
|
|
|
|
|
|
=head1 NAME |
326
|
|
|
|
|
|
|
|
327
|
|
|
|
|
|
|
Data::Pageset::Exponential - Page numbering for very large page numbers |
328
|
|
|
|
|
|
|
|
329
|
|
|
|
|
|
|
=head1 VERSION |
330
|
|
|
|
|
|
|
|
331
|
|
|
|
|
|
|
version v0.3.3 |
332
|
|
|
|
|
|
|
|
333
|
|
|
|
|
|
|
=head1 SYNOPSIS |
334
|
|
|
|
|
|
|
|
335
|
|
|
|
|
|
|
my $pager = Data::Pageset::Exponential->new( |
336
|
|
|
|
|
|
|
total_entries => $total_entries, |
337
|
|
|
|
|
|
|
entries_per_page => $per_page, |
338
|
|
|
|
|
|
|
); |
339
|
|
|
|
|
|
|
|
340
|
|
|
|
|
|
|
$pager->current_page( 1 ); |
341
|
|
|
|
|
|
|
|
342
|
|
|
|
|
|
|
my $pages = $pager->pages_in_set; |
343
|
|
|
|
|
|
|
|
344
|
|
|
|
|
|
|
# Returns |
345
|
|
|
|
|
|
|
# [ 1, 2, 3, 10, 20, 30, 100, 200, 300, 1000, 2000, 3000 ] |
346
|
|
|
|
|
|
|
|
347
|
|
|
|
|
|
|
=head1 DESCRIPTION |
348
|
|
|
|
|
|
|
|
349
|
|
|
|
|
|
|
This is a pager designed for paging through resultsets that contain |
350
|
|
|
|
|
|
|
hundreds if not thousands of pages. |
351
|
|
|
|
|
|
|
|
352
|
|
|
|
|
|
|
The interface is similar to L<Data::Pageset> with sliding pagesets. |
353
|
|
|
|
|
|
|
|
354
|
|
|
|
|
|
|
=head1 ATTRIBUTES |
355
|
|
|
|
|
|
|
|
356
|
|
|
|
|
|
|
=head2 C<total_entries> |
357
|
|
|
|
|
|
|
|
358
|
|
|
|
|
|
|
This is the total number of entries. |
359
|
|
|
|
|
|
|
|
360
|
|
|
|
|
|
|
It is a read/write attribute. |
361
|
|
|
|
|
|
|
|
362
|
|
|
|
|
|
|
=head2 C<entries_per_page> |
363
|
|
|
|
|
|
|
|
364
|
|
|
|
|
|
|
This is the total number of entries per page. It defaults to C<10>. |
365
|
|
|
|
|
|
|
|
366
|
|
|
|
|
|
|
It is a read/write attribute. |
367
|
|
|
|
|
|
|
|
368
|
|
|
|
|
|
|
=head2 C<first_page> |
369
|
|
|
|
|
|
|
|
370
|
|
|
|
|
|
|
This returns the first page. It defaults to C<1>. |
371
|
|
|
|
|
|
|
|
372
|
|
|
|
|
|
|
=head2 C<current_page> |
373
|
|
|
|
|
|
|
|
374
|
|
|
|
|
|
|
This is the current page number. It defaults to the L</first_page>. |
375
|
|
|
|
|
|
|
|
376
|
|
|
|
|
|
|
It is a read/write attribute. |
377
|
|
|
|
|
|
|
|
378
|
|
|
|
|
|
|
=head2 C<exponent_base> |
379
|
|
|
|
|
|
|
|
380
|
|
|
|
|
|
|
This is the base exponent for page sets. It defaults to C<10>. |
381
|
|
|
|
|
|
|
|
382
|
|
|
|
|
|
|
=head2 C<exponent_max> |
383
|
|
|
|
|
|
|
|
384
|
|
|
|
|
|
|
This is the maximum exponent for page sets. It defaults to C<3>, for |
385
|
|
|
|
|
|
|
pages in the thousands. |
386
|
|
|
|
|
|
|
|
387
|
|
|
|
|
|
|
It should not be greater than |
388
|
|
|
|
|
|
|
|
389
|
|
|
|
|
|
|
ceil( log( $total_pages ) / log(10) ) |
390
|
|
|
|
|
|
|
|
391
|
|
|
|
|
|
|
however, larger numbers will increase the size of L</pages_in_set>. |
392
|
|
|
|
|
|
|
|
393
|
|
|
|
|
|
|
=head2 C<pages_per_exponent> |
394
|
|
|
|
|
|
|
|
395
|
|
|
|
|
|
|
This is the number of pages per exponent. It defaults to C<3>. |
396
|
|
|
|
|
|
|
|
397
|
|
|
|
|
|
|
=head2 C<pages_per_set> |
398
|
|
|
|
|
|
|
|
399
|
|
|
|
|
|
|
This is the maximum number of pages in L</pages_in_set>. It defaults |
400
|
|
|
|
|
|
|
to |
401
|
|
|
|
|
|
|
|
402
|
|
|
|
|
|
|
1 + 2 * ( $pages_per_exponent * ( $exponent_max + 1 ) - 1 ) |
403
|
|
|
|
|
|
|
|
404
|
|
|
|
|
|
|
which for the default values is 23. |
405
|
|
|
|
|
|
|
|
406
|
|
|
|
|
|
|
This should be an odd number. |
407
|
|
|
|
|
|
|
|
408
|
|
|
|
|
|
|
This was renamed from L</max_pages_per_set> in v0.3.0. |
409
|
|
|
|
|
|
|
|
410
|
|
|
|
|
|
|
=head2 C<max_pages_per_set> |
411
|
|
|
|
|
|
|
|
412
|
|
|
|
|
|
|
This is a deprecated alias for L</pages_per_set>. |
413
|
|
|
|
|
|
|
|
414
|
|
|
|
|
|
|
=head1 METHODS |
415
|
|
|
|
|
|
|
|
416
|
|
|
|
|
|
|
=head2 C<entries_on_this_page> |
417
|
|
|
|
|
|
|
|
418
|
|
|
|
|
|
|
Returns the number of entries on the page. |
419
|
|
|
|
|
|
|
|
420
|
|
|
|
|
|
|
=head2 C<last_page> |
421
|
|
|
|
|
|
|
|
422
|
|
|
|
|
|
|
Returns the number of the last page. |
423
|
|
|
|
|
|
|
|
424
|
|
|
|
|
|
|
=head2 C<first> |
425
|
|
|
|
|
|
|
|
426
|
|
|
|
|
|
|
Returns the index of the first entry on the L</current_page>. |
427
|
|
|
|
|
|
|
|
428
|
|
|
|
|
|
|
=head2 C<last> |
429
|
|
|
|
|
|
|
|
430
|
|
|
|
|
|
|
Returns the index of the last entry on the L</current_page>. |
431
|
|
|
|
|
|
|
|
432
|
|
|
|
|
|
|
=head2 C<previous_page> |
433
|
|
|
|
|
|
|
|
434
|
|
|
|
|
|
|
Returns the number of the previous page. |
435
|
|
|
|
|
|
|
|
436
|
|
|
|
|
|
|
=head2 C<next_page> |
437
|
|
|
|
|
|
|
|
438
|
|
|
|
|
|
|
Returns the number of the next page. |
439
|
|
|
|
|
|
|
|
440
|
|
|
|
|
|
|
=head2 C<pages_in_set> |
441
|
|
|
|
|
|
|
|
442
|
|
|
|
|
|
|
Returns an array reference of pages in the page set. |
443
|
|
|
|
|
|
|
|
444
|
|
|
|
|
|
|
=head2 C<previous_set> |
445
|
|
|
|
|
|
|
|
446
|
|
|
|
|
|
|
This returns the first page number of the previous page set, for the |
447
|
|
|
|
|
|
|
first exponent. |
448
|
|
|
|
|
|
|
|
449
|
|
|
|
|
|
|
It is added for compatability with L<Data::Pageset>. |
450
|
|
|
|
|
|
|
|
451
|
|
|
|
|
|
|
=head2 C<next_set> |
452
|
|
|
|
|
|
|
|
453
|
|
|
|
|
|
|
This returns the first page number of the next page set, for the first |
454
|
|
|
|
|
|
|
exponent. |
455
|
|
|
|
|
|
|
|
456
|
|
|
|
|
|
|
It is added for compatability with L<Data::Pageset>. |
457
|
|
|
|
|
|
|
|
458
|
|
|
|
|
|
|
=for Pod::Coverage isa |
459
|
|
|
|
|
|
|
|
460
|
|
|
|
|
|
|
=for Pod::Coverage series |
461
|
|
|
|
|
|
|
|
462
|
|
|
|
|
|
|
=for Pod::Coverage splice |
463
|
|
|
|
|
|
|
|
464
|
|
|
|
|
|
|
=for Pod::Coverage skipped |
465
|
|
|
|
|
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466
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=for Pod::Coverage change_entries_per_page |
467
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468
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=for Pod::Coverage BUILDARGS |
469
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470
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=head1 KNOWN ISSUES |
471
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472
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=head2 Differences with Data::Page |
473
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474
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This module is intended as a drop-in replacement for L<Data::Page>. |
475
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However, it is based on a complete rewrite of L<Data::Page> using |
476
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L<Moo>, rather than extending it. Because of that, it needs to fake |
477
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C<@ISA>. This may break some applications. |
478
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479
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Otherwise, it has the following differences: |
480
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481
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=over |
482
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483
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=item * |
484
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485
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The attributes have type constraints. Invalid data may throw a fatal |
486
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error instead of being ignored. |
487
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488
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=item * |
489
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490
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Setting the L</current_page> to a value outside the L</first_page> or |
491
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L</last_page> will return the first or last page, instead of that |
492
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value. |
493
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494
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=back |
495
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496
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=head2 Differences with Data::Pageset |
497
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498
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This module can behave like L<Data::Pageset> in C<slide> mode if the |
499
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exponent is set to C<1>: |
500
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501
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my $pager = Data::Pageset::Exponential->new( |
502
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exponent_max => 1, |
503
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pages_per_exponent => 10, |
504
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pages_per_set => 10, |
505
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); |
506
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507
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|
=head1 SUPPORT FOR OLDER PERL VERSIONS |
508
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509
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|
This module requires Perl v5.10.1 or later. |
510
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511
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Future releases may only support Perl versions released in the last ten years. |
512
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513
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|
=head1 SEE ALSO |
514
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515
|
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=over |
516
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517
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=item * |
518
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519
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|
L<Data::Page> |
520
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521
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=item * |
522
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523
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|
L<Data::Pageset> |
524
|
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525
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=back |
526
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527
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|
=head1 SOURCE |
528
|
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529
|
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|
|
The development version is on github at L<https://github.com/robrwo/Data-Pageset-Exponential> |
530
|
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|
|
and may be cloned from L<git://github.com/robrwo/Data-Pageset-Exponential.git> |
531
|
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532
|
|
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|
|
=head1 BUGS |
533
|
|
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534
|
|
|
|
|
|
|
Please report any bugs or feature requests on the bugtracker website |
535
|
|
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|
|
L<https://github.com/robrwo/Data-Pageset-Exponential/issues> |
536
|
|
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|
|
537
|
|
|
|
|
|
|
When submitting a bug or request, please include a test-file or a |
538
|
|
|
|
|
|
|
patch to an existing test-file that illustrates the bug or desired |
539
|
|
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|
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|
|
feature. |
540
|
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|
541
|
|
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|
|
=head1 AUTHOR |
542
|
|
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|
543
|
|
|
|
|
|
|
Robert Rothenberg <rrwo@cpan.org> |
544
|
|
|
|
|
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|
|
545
|
|
|
|
|
|
|
Test code was adapted from L<Data::Page> to ensure compatability. |
546
|
|
|
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|
547
|
|
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|
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|
|
=head1 COPYRIGHT AND LICENSE |
548
|
|
|
|
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|
|
|
549
|
|
|
|
|
|
|
This software is Copyright (c) 2018-2023 by Robert Rothenberg. |
550
|
|
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|
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|
|
551
|
|
|
|
|
|
|
This is free software, licensed under: |
552
|
|
|
|
|
|
|
|
553
|
|
|
|
|
|
|
The Artistic License 2.0 (GPL Compatible) |
554
|
|
|
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|
|
555
|
|
|
|
|
|
|
=cut |