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35
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use 5.008; |
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7
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2
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77
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2
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2
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2
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11
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use strict; |
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3
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55
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3
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2
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10
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use warnings; |
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4
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2
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90
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4
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5
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package String::FlexMatch; |
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our $VERSION = '1.100820'; |
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# ABSTRACT: Flexible ways to match a string |
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2
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2
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1909
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use parent 'Class::Accessor::Complex'; |
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2
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584
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2
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10
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9
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__PACKAGE__->mk_new; |
10
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11
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# Back in Test::More 0.45 the sane view was taken that if an object overrides |
12
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# stringification, it probably does so for a reason, and that stringification |
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# defines how the object wants to be compared. Newer versions of Test::More |
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# simply say that if you have a string and a reference, they can't possibly be |
15
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# the same, effectively overriding overload. This is completely fucked up, and |
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# we override it here again. |
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# |
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# You might say that's an evil hack and I might say I don't care. If you use |
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# String::FlexMatch you subscribe to my point of view. |
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#require Test::Builder; |
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#no warnings 'redefine'; |
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#*Test::Builder::_unoverload = sub {}; |
23
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use overload |
24
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2
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58
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'""' => \&as_string, |
25
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'eq' => \&is_eq, |
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'ne' => \&is_ne, |
27
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2
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2
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55414
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'==' => \&is_eq; |
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2
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8
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28
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0
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0
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1
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0
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sub init { } # so potential subclasses can override |
29
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30
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sub string { |
31
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17
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17
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1
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19
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my $self = shift; |
32
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17
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50
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88
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@_ ? $self->{string} = shift : $self->{string}; |
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} |
34
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35
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sub force_regex { |
36
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25
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100
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25
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1
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62
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return unless defined $_[1]; |
37
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20
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50
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192
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ref $_[1] eq 'Regexp' ? $_[1] : qr/$_[1]/; |
38
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} |
39
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40
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sub regex { |
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25
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25
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1
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28
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my $self = shift; |
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@_ |
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25
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50
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82
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? $self->{regex} = $self->force_regex(+shift) |
44
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: $self->force_regex($self->{regex}); |
45
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} |
46
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47
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sub force_code { |
48
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10
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50
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10
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1
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19
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return unless defined $_[1]; |
49
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10
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50
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587
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ref $_[1] eq 'CODE' ? $_[1] : eval $_[1]; |
50
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} |
51
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52
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sub code { |
53
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10
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10
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1
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13
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my $self = shift; |
54
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@_ |
55
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10
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50
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29
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? $self->{code} = $self->force_code(+shift) |
56
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: $self->force_code($self->{code}); |
57
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} |
58
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0
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0
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1
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0
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sub as_string { $_[0]->choice_attr } |
59
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60
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sub is_eq { |
61
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16
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16
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1
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25
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my ($lhs, $rhs) = @_; |
62
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63
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# only 'undef' matches 'undef'; if one side is undef and the other is not, |
64
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# there's no match |
65
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16
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50
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34
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return !defined $rhs unless defined $lhs; |
66
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16
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50
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31
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return !defined $lhs unless defined $rhs; |
67
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16
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50
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33
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146
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my $lhs_val = |
68
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ref($lhs) && $lhs->isa('String::FlexMatch') ? $lhs->choice_attr : "$lhs"; |
69
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16
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50
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33
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97
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my $rhs_val = |
70
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ref($rhs) && $rhs->isa('String::FlexMatch') ? $rhs->choice_attr : "$rhs"; |
71
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16
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100
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28
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my $key = sprintf "%s_%s", map { ref || 'STRING' } $lhs_val, $rhs_val; |
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32
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157
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72
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our $match ||= { |
73
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1
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1
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13
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STRING_STRING => sub { $_[0] eq $_[1] }, |
74
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0
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0
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0
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STRING_Regexp => sub { $_[0] =~ $_[1] }, |
75
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0
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0
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0
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STRING_CODE => sub { $_[1]->($_[0]) }, |
76
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10
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10
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113
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Regexp_STRING => sub { $_[1] =~ $_[0] }, |
77
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0
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0
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0
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Regexp_Regexp => sub { die "can't compare two regexes" }, |
78
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0
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0
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0
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Regexp_CODE => sub { die "can't compare a regex to a string" }, |
79
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5
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5
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120
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CODE_STRING => sub { $_[0]->($_[1]) }, |
80
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0
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0
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0
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CODE_Regexp => sub { die "can't compare a coderef to a regex" }, |
81
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0
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0
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0
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CODE_CODE => sub { die "can't compare two coderefs" }, |
82
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16
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100
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98
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}; |
83
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16
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37
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$match->{$key}->($lhs_val, $rhs_val); |
84
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} |
85
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0
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0
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1
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0
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sub is_ne { !is_eq(@_) } |
86
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87
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sub choice_attr { |
88
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16
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16
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1
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20
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my $self = shift; |
89
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16
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50
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36
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defined $self->string ? $self->string |
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100
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100
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90
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: defined $self->regex ? $self->regex |
91
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: defined $self->code ? $self->code |
92
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: undef; |
93
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} |
94
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95
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# If this module is used with YAML::Active, we want it to dump as a |
96
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# String::Flex::NoOverload object. If this sub wasn't there, YAML would |
97
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# stringify the String::FlexMatch object, which would produce a normal string |
98
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# (cf. as_string() - something like '(?-xism:blah)'. However, we wouldn't be |
99
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# able to re-Load this dump via YAML::Active again, since the string, when |
100
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# loaded, would just stay a normal string and not turn into a |
101
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# String::FlexMatch object again. |
102
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# |
103
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# To remedy this, we provide this sub to tell YAML::Active how we want a |
104
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# String::FlexMatch object dumped: as a String::FlexMatch::NoOverload object, |
105
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# which can then be given to YAML to dump - it will produce something like |
106
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# |
107
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# !perl/String::FlexMatch::NoOverload regex: ... |
108
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# |
109
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# The last piece of the puzzle is to make String::FlexMatch::NoOverload |
110
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# inherit from String::FlexMatch. That way, when re-Loading the above YAML, |
111
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# the expected behaviour of the flex string still works. |
112
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0
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0
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1
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sub prepare_dump { @String::FlexMatch::NoOverload::ISA = () } |
113
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0
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0
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1
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sub finish_dump { @String::FlexMatch::NoOverload::ISA = 'String::FlexMatch' } |
114
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115
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sub yaml_dump { |
116
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0
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0
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1
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my $self = shift; |
117
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0
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my $dump_self; |
118
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0
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%$dump_self = %$self; |
119
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0
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bless $dump_self, 'String::FlexMatch::NoOverload'; |
120
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} |
121
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@String::FlexMatch::NoOverload::ISA = 'String::FlexMatch'; |
122
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1; |
123
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124
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125
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__END__ |