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
|
package Monkey::Patch::Action::Handle;
our $DATE = '2018-04-02'; # DATE
our $VERSION = '0.061'; # VERSION
use 5.010;
use strict;
use warnings;
use Scalar::Util qw(weaken);
use Sub::Delete;
my %stacks;
sub __find_previous {
my ($stack, $code) = @_;
state $empty = sub {};
for my $i (1..$#$stack) {
if ($stack->[$i][1] == $code) {
return $stack->[$i-1][2] // $stack->[$i-1][1];
}
}
$empty;
}
sub new {
my ($class, %args) = @_;
my $type = $args{-type};
delete $args{-type};
my $code = $args{code};
my $name = "$args{package}::$args{subname}";
my $stack;
if (!$stacks{$name}) {
$stacks{$name} = [];
push @{$stacks{$name}}, [sub => \&$name] if defined(&$name);
}
$stack = $stacks{$name};
my $self = bless \%args, $class;
no strict 'refs';
no warnings 'redefine';
if ($type eq 'sub') {
push @$stack, [$type => $code];
*$name = $code;
} elsif ($type eq 'delete') {
$code = sub {};
$args{code} = $code;
push @$stack, [$type, $code];
delete_sub $name;
} elsif ($type eq 'wrap') {
weaken($self);
my $wrapper = sub {
my $ctx = {
package => $self->{package},
subname => $self->{subname},
extra => $self->{extra},
orig => __find_previous($stack, $self->{code}),
};
unshift @_, $ctx;
goto &{$self->{code}};
};
push @$stack, [$type => $code => $wrapper];
*$name = $wrapper;
}
$self;
}
sub DESTROY {
my $self = shift;
my $name = "$self->{package}::$self->{subname}";
my $stack = $stacks{$name};
my $code = $self->{code};
for my $i (0..$#$stack) {
if($stack->[$i][1] == $code) {
if ($stack->[$i+1]) {
# check conflict
if ($stack->[$i+1][0] eq 'wrap' &&
($i == 0 || $stack->[$i-1][0] eq 'delete')) {
my $p = $self->{patcher};
warn "Warning: unapplying patch to $name ".
"(applied in $p->[1]:$p->[2]) before a wrapping patch";
}
}
no strict 'refs';
if ($i == @$stack-1) {
if ($i) {
no warnings 'redefine';
if ($stack->[$i-1][0] eq 'delete') {
delete_sub $name;
} else {
*$name = $stack->[$i-1][2] // $stack->[$i-1][1];
}
} else {
delete_sub $name;
}
}
splice @$stack, $i, 1;
last;
}
}
}
1;
__END__
=pod
=encoding UTF-8
=head1 NAME
Monkey::Patch::Action::Handle
=head1 VERSION
This document describes version 0.061 of Monkey::Patch::Action::Handle (from Perl distribution Monkey-Patch-Action), released on 2018-04-02.
=for Pod::Coverage .*
=head1 HOMEPAGE
Please visit the project's homepage at L<https://metacpan.org/release/Monkey-Patch-Action>.
=head1 SOURCE
Source repository is at L<https://github.com/perlancar/perl-Monkey-Patch-Action>.
=head1 BUGS
Please report any bugs or feature requests on the bugtracker website L<https://rt.cpan.org/Public/Dist/Display.html?Name=Monkey-Patch-Action>
When submitting a bug or request, please include a test-file or a
patch to an existing test-file that illustrates the bug or desired
feature.
=head1 AUTHOR
perlancar <perlancar@cpan.org>
=head1 COPYRIGHT AND LICENSE
This software is copyright (c) 2018, 2017, 2012 by perlancar@cpan.org.
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.
=cut
|
