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## |
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## String::Divert - String Object supporting Folding and Diversion |
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## Copyright (c) 2003-2005 Ralf S. Engelschall |
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## |
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## This file is part of String::Divert, a Perl module providing |
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## a string object supporting folding and diversion. |
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## |
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## This program is free software; you can redistribute it and/or |
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## modify it under the terms of the GNU General Public License |
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## as published by the Free Software Foundation; either version |
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## 2.0 of the License, or (at your option) any later version. |
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## |
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## This program is distributed in the hope that it will be useful, |
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## but WITHOUT ANY WARRANTY; without even the implied warranty of |
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## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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## General Public License for more details. |
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## |
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## You should have received a copy of the GNU General Public License |
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## along with this file; if not, write to the Free Software Foundation, |
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## Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. |
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## |
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## Divert.pm: Module Implementation |
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## |
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# _________________________________________________________________________ |
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# |
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# STANDARD OBJECT ORIENTED API |
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# _________________________________________________________________________ |
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# |
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package String::Divert; |
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22156
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use 5.006; |
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use strict; |
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use warnings; |
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use Carp; |
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1
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3741
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require Exporter; |
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our $VERSION = '0.96'; |
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our @ISA = qw(Exporter); |
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our @EXPORT = qw(); |
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our @EXPORT_OK = qw(); |
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# internal: create an anonymous object name |
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my $_anonymous_count = 1; |
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sub _anonymous_name () { |
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2
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return sprintf("ANONYMOUS:%d", $_anonymous_count++); |
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} |
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# object construction |
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sub new ($;$) { |
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my ($proto, $name) = @_; |
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my $class = ref($proto) || $proto; |
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my $self = {}; |
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bless ($self, $class); |
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$name ||= &String::Divert::_anonymous_name(); |
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$self->{name} = $name; # name of object |
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$self->{overwrite} = 'none'; # overwrite mode (none|once|always) |
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$self->{storage} = 'all'; # storage mode (none|fold|all) |
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$self->{copying} = 'pass'; # copying mode (pass|clone) |
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$self->{chunks} = []; # string chunks |
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$self->{diversion} = []; # stack of active diversions |
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$self->{foldermk} = '{#%s#}'; # folder text representation format |
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$self->{folderre} = '\{#([a-zA-Z_][a-zA-Z0-9_]*)#\}'; # folder text representation regexp |
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$self->{folderlst} = undef; # folder object of last folding operation |
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72
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return $self; |
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} |
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# object destruction (explicit) |
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sub destroy ($) { |
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1
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1
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1
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369
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$_[0]->overload(0); |
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1
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3
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bless $_[0], 'UNIVERSAL'; |
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1
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2
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undef $_[0]; |
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1
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10
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return; |
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} |
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83
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# object destruction (implicit) |
84
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sub DESTROY ($) { |
85
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7
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349
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$_[0]->overload(0); |
86
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15
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bless $_[0], 'UNIVERSAL'; |
87
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347
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return; |
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} |
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90
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# clone object |
91
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sub clone ($) { |
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1
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1
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1
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2
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my ($self) = @_; |
93
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1
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3
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my $ov = $self->overload(); |
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1
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11
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$self->overload(0); |
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2
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eval { require Storable; }; |
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1715
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1
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4577
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croak "required module \"Storable\" not installed" if ($@); |
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1
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149
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my $clone = Storable::dclone($self); |
98
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1
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7
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$self->overload($ov); |
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1
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3
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$clone->overload($ov); |
100
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1
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5
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return $clone; |
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} |
102
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103
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# operation: set/get name of object |
104
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sub name ($;$) { |
105
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14
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14
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1
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289
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my ($self, $name) = @_; |
106
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14
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43
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return $self->{diversion}->[-1]->name($name) |
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14
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50
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18
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if (@{$self->{diversion}} > 0); |
108
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14
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27
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my $old_name = $self->{name}; |
109
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14
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100
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29
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if (defined($name)) { |
110
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2
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4
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$self->{name} = $name; |
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} |
112
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14
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56
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return $old_name; |
113
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} |
114
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115
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# operation: set/get overwrite mode |
116
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sub overwrite ($;$) { |
117
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3
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3
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1
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7
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my ($self, $mode) = @_; |
118
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3
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10
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return $self->{diversion}->[-1]->overwrite($mode) |
119
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3
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50
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4
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if (@{$self->{diversion}} > 0); |
120
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3
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8
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my $old_mode = $self->{overwrite}; |
121
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3
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50
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8
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if (defined($mode)) { |
122
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3
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50
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15
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croak "invalid overwrite mode argument" |
123
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if ($mode !~ m/^(none|once|always)$/); |
124
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3
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9
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$self->{overwrite} = $mode; |
125
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} |
126
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3
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7
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return $old_mode; |
127
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} |
128
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129
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# operation: set/get storage mode |
130
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sub storage ($;$) { |
131
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0
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0
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1
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0
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my ($self, $mode) = @_; |
132
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0
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0
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return $self->{diversion}->[-1]->storage($mode) |
133
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0
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0
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0
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if (@{$self->{diversion}} > 0); |
134
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0
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0
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my $old_mode = $self->{storage}; |
135
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0
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0
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0
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if (defined($mode)) { |
136
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0
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0
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0
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croak "invalid storage mode argument" |
137
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if ($mode !~ m/^(none|fold|all)$/); |
138
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0
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0
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$self->{storage} = $mode; |
139
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} |
140
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0
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0
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return $old_mode; |
141
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} |
142
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143
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# operation: set/get copy constructor mode |
144
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sub copying ($;$) { |
145
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0
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0
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1
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0
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my ($self, $mode) = @_; |
146
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0
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0
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return $self->{diversion}->[-1]->copying($mode) |
147
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0
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0
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0
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if (@{$self->{diversion}} > 0); |
148
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0
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0
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my $old_mode = $self->{copying}; |
149
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0
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0
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0
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if (defined($mode)) { |
150
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0
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0
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0
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croak "invalid copying mode argument" |
151
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if ($mode !~ m/^(clone|pass)$/); |
152
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0
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0
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$self->{copying} = $mode; |
153
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} |
154
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0
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0
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return $old_mode; |
155
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} |
156
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157
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# internal: split string into chunks |
158
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sub _chunking ($$) { |
159
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29
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29
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44
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my ($self, $string) = @_; |
160
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29
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42
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my @chunks = (); |
161
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29
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46
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my $folderre = $self->{folderre}; |
162
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29
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197
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while ($string =~ m/${folderre}()/s) { |
163
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0
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0
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my ($prolog, $id) = ($`, $1); |
164
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0
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0
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0
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0
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push(@chunks, $prolog) if ($prolog ne '' and $self->{storage} !~ m/^(none|fold)/); |
165
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0
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0
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0
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croak "empty folding object name" |
166
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if ($id eq ''); |
167
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0
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0
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0
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if ($self->{storage} ne 'none') { |
168
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0
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0
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my $object = $self->folding($id); |
169
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0
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0
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0
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$object = $self->new($id) if (not defined($object)); |
170
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0
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0
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0
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croak "cannot create new folding sub object \"$id\"" |
171
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if (not defined($object)); |
172
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0
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0
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push(@chunks, $object); |
173
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} |
174
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0
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0
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$string = $'; |
175
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} |
176
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29
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50
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33
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168
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push(@chunks, $string) if ($string ne '' and $self->{storage} !~ m/^(none|fold)/); |
177
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29
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83
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return @chunks; |
178
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} |
179
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180
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# operation: assign an object |
181
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sub assign ($$) { |
182
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11
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11
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1
|
1036
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my ($self, $obj) = @_; |
183
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11
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123
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return $self->{diversion}->[-1]->assign($obj) |
184
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11
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50
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11
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if (@{$self->{diversion}} > 0); |
185
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11
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50
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26
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croak "cannot assign undefined object" |
186
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|
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if (not defined($obj)); |
187
|
11
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50
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26
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if (&String::Divert::_isobj($obj)) { |
188
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0
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0
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$self->{chunks} = [ $obj ]; |
189
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0
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0
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0
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$self->{folderlst} = $obj if (ref($obj)); |
190
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} |
191
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else { |
192
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11
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25
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$self->{chunks} = []; |
193
|
11
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39
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foreach my $chunk ($self->_chunking($obj)) { |
194
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11
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16
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push(@{$self->{chunks}}, $chunk); |
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11
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27
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195
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11
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50
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53
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$self->{folderlst} = $chunk if (ref($chunk)); |
196
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|
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} |
197
|
|
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|
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} |
198
|
11
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|
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|
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26
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return $self; |
199
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|
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|
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|
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} |
200
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|
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201
|
|
|
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|
|
# operation: append an object |
202
|
|
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|
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|
|
sub append ($$) { |
203
|
25
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25
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1
|
336
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my ($self, $obj) = @_; |
204
|
25
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|
|
98
|
return $self->{diversion}->[-1]->append($obj) |
205
|
25
|
100
|
|
|
|
27
|
if (@{$self->{diversion}} > 0); |
206
|
21
|
50
|
|
|
|
50
|
croak "cannot append undefined object" |
207
|
|
|
|
|
|
|
if (not defined($obj)); |
208
|
21
|
100
|
100
|
|
|
160
|
if ( $self->{overwrite} eq 'once' |
209
|
|
|
|
|
|
|
or $self->{overwrite} eq 'always') { |
210
|
3
|
|
|
|
|
7
|
$self->assign($obj); |
211
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3
|
100
|
|
|
|
14
|
$self->{overwrite} = 'none' |
212
|
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|
|
|
if ($self->{overwrite} eq 'once'); |
213
|
|
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|
|
} |
214
|
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|
|
else { |
215
|
18
|
50
|
|
|
|
35
|
if (&String::Divert::_isobj($obj)) { |
216
|
0
|
|
|
|
|
0
|
push(@{$self->{chunks}}, $obj); |
|
0
|
|
|
|
|
0
|
|
217
|
0
|
0
|
|
|
|
0
|
$self->{folderlst} = $obj if (ref($obj)); |
218
|
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|
|
|
|
} |
219
|
|
|
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|
|
else { |
220
|
18
|
|
|
|
|
43
|
foreach my $chunk ($self->_chunking($obj)) { |
221
|
18
|
100
|
100
|
|
|
53
|
if (ref($chunk) or (@{$self->{chunks}} > 0 and ref($self->{chunks}->[-1]))) { |
|
18
|
100
|
33
|
|
|
92
|
|
|
12
|
|
|
|
|
58
|
|
222
|
6
|
|
|
|
|
10
|
push(@{$self->{chunks}}, $chunk); |
|
6
|
|
|
|
|
10
|
|
223
|
6
|
50
|
|
|
|
27
|
$self->{folderlst} = $chunk if (ref($chunk)); |
224
|
|
|
|
|
|
|
} |
225
|
|
|
|
|
|
|
elsif (@{$self->{chunks}} > 0) { |
226
|
6
|
|
|
|
|
26
|
$self->{chunks}->[-1] .= $chunk; |
227
|
|
|
|
|
|
|
} |
228
|
|
|
|
|
|
|
else { |
229
|
6
|
|
|
|
|
27
|
$self->{chunks} = [ $chunk ]; |
230
|
|
|
|
|
|
|
} |
231
|
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|
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|
|
|
} |
232
|
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|
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|
|
|
} |
233
|
|
|
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|
|
|
} |
234
|
21
|
|
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|
|
50
|
return $self; |
235
|
|
|
|
|
|
|
} |
236
|
|
|
|
|
|
|
|
237
|
|
|
|
|
|
|
# operation: unfold (and return) string contents temporarily |
238
|
|
|
|
|
|
|
sub string ($) { |
239
|
27
|
|
|
27
|
1
|
1134
|
my ($self) = @_; |
240
|
27
|
|
|
|
|
90
|
return $self->{diversion}->[-1]->string() |
241
|
27
|
100
|
|
|
|
59
|
if (@{$self->{diversion}} > 0); |
242
|
25
|
|
|
|
|
75
|
return $self->_string([]); |
243
|
|
|
|
|
|
|
} |
244
|
|
|
|
|
|
|
|
245
|
|
|
|
|
|
|
# internal: string() operation with loop detection |
246
|
|
|
|
|
|
|
sub _string ($$) { |
247
|
45
|
|
|
45
|
|
67
|
my ($self, $visit) = @_; |
248
|
45
|
|
|
|
|
112
|
my $string = ''; |
249
|
45
|
50
|
|
|
|
51
|
if (grep { &String::Divert::_isobjeq($_, $self) } @{$visit}) { |
|
27
|
|
|
|
|
50
|
|
|
45
|
|
|
|
|
136
|
|
250
|
0
|
|
|
|
|
0
|
croak "folding loop detected: " . |
251
|
0
|
|
|
|
|
0
|
join(" -> ", map { $_->name() } @{$visit}) . |
|
0
|
|
|
|
|
0
|
|
252
|
|
|
|
|
|
|
" -> " . $self->name(); |
253
|
|
|
|
|
|
|
} |
254
|
45
|
|
|
|
|
64
|
push(@{$visit}, $self); |
|
45
|
|
|
|
|
963
|
|
255
|
45
|
|
|
|
|
59
|
foreach my $chunk (@{$self->{chunks}}) { |
|
45
|
|
|
|
|
176
|
|
256
|
80
|
100
|
|
|
|
141
|
if (ref($chunk)) { |
257
|
|
|
|
|
|
|
# folding loop detection |
258
|
20
|
|
|
|
|
32
|
my $prefix = ''; |
259
|
|
|
|
|
|
|
# check for existing prefix |
260
|
|
|
|
|
|
|
# (keep in mind that m|([^\n]+)$|s _DOES NOT_ |
261
|
|
|
|
|
|
|
# take a possibly existing terminating newline |
262
|
|
|
|
|
|
|
# into account, so we really need an extra match!) |
263
|
20
|
50
|
33
|
|
|
200
|
if ($string =~ m|([^\n]+)$|s and $string !~ m|\n$|s) { |
264
|
20
|
|
|
|
|
47
|
$prefix = $1; |
265
|
20
|
|
|
|
|
125
|
$prefix =~ s|[^ \t]| |sg; |
266
|
|
|
|
|
|
|
} |
267
|
20
|
|
|
|
|
69
|
my $block = $chunk->_string($visit); # recursion! |
268
|
20
|
50
|
|
|
|
65
|
$block =~ s|\n(?=.)|\n$prefix|sg if ($prefix ne ''); |
269
|
20
|
|
|
|
|
45
|
$string .= $block; |
270
|
|
|
|
|
|
|
} |
271
|
|
|
|
|
|
|
else { |
272
|
60
|
|
|
|
|
142
|
$string .= $chunk; |
273
|
|
|
|
|
|
|
} |
274
|
|
|
|
|
|
|
} |
275
|
45
|
|
|
|
|
68
|
pop(@{$visit}); |
|
45
|
|
|
|
|
64
|
|
276
|
45
|
|
|
|
|
430
|
return $string; |
277
|
|
|
|
|
|
|
} |
278
|
|
|
|
|
|
|
|
279
|
|
|
|
|
|
|
# operation: unfold string contents temporarily until already true or finally false |
280
|
|
|
|
|
|
|
sub bool ($) { |
281
|
0
|
|
|
0
|
1
|
0
|
my ($self) = @_; |
282
|
0
|
|
|
|
|
0
|
return $self->{diversion}->[-1]->bool() |
283
|
0
|
0
|
|
|
|
0
|
if (@{$self->{diversion}} > 0); |
284
|
0
|
|
|
|
|
0
|
my $string = ''; |
285
|
0
|
|
|
|
|
0
|
foreach my $chunk (@{$self->{chunks}}) { |
|
0
|
|
|
|
|
0
|
|
286
|
0
|
0
|
|
|
|
0
|
if (ref($chunk)) { |
287
|
0
|
|
|
|
|
0
|
$string .= $chunk->string(); # recursion! |
288
|
|
|
|
|
|
|
} |
289
|
|
|
|
|
|
|
else { |
290
|
0
|
|
|
|
|
0
|
$string .= $chunk; |
291
|
|
|
|
|
|
|
} |
292
|
0
|
0
|
|
|
|
0
|
return 1 if ($string); |
293
|
|
|
|
|
|
|
} |
294
|
0
|
|
|
|
|
0
|
return 0; |
295
|
|
|
|
|
|
|
} |
296
|
|
|
|
|
|
|
|
297
|
|
|
|
|
|
|
# operation: append folding sub-object |
298
|
|
|
|
|
|
|
sub fold ($;$) { |
299
|
7
|
|
|
7
|
1
|
22
|
my ($self, $id) = @_; |
300
|
7
|
|
|
|
|
29
|
return $self->{diversion}->[-1]->fold($id) |
301
|
7
|
100
|
|
|
|
10
|
if (@{$self->{diversion}} > 0); |
302
|
6
|
50
|
|
|
|
21
|
return undef if ($self->{storage} eq 'none'); |
303
|
6
|
50
|
|
|
|
14
|
$id = &String::Divert::_anonymous_name() |
304
|
|
|
|
|
|
|
if (not defined($id)); |
305
|
6
|
50
|
|
|
|
13
|
if (ref($id)) { |
306
|
0
|
0
|
|
|
|
0
|
croak "folding object not of class String::Divert" |
307
|
|
|
|
|
|
|
if (not &String::Divert::_isobj($id)); |
308
|
0
|
|
|
|
|
0
|
push(@{$self->{chunks}}, $id); |
|
0
|
|
|
|
|
0
|
|
309
|
0
|
|
|
|
|
0
|
$self->{folderlst} = $id; |
310
|
0
|
|
|
|
|
0
|
return $id; |
311
|
|
|
|
|
|
|
} |
312
|
|
|
|
|
|
|
else { |
313
|
6
|
|
|
|
|
22
|
my $object = $self->folding($id); |
314
|
6
|
100
|
|
|
|
27
|
$object = $self->new($id) if (not defined($object)); |
315
|
6
|
50
|
|
|
|
19
|
croak "unable to create new folding object" |
316
|
|
|
|
|
|
|
if (not defined($object)); |
317
|
6
|
|
|
|
|
10
|
push(@{$self->{chunks}}, $object); |
|
6
|
|
|
|
|
13
|
|
318
|
6
|
|
|
|
|
10
|
$self->{folderlst} = $object; |
319
|
6
|
|
|
|
|
19
|
return $object; |
320
|
|
|
|
|
|
|
} |
321
|
|
|
|
|
|
|
} |
322
|
|
|
|
|
|
|
|
323
|
|
|
|
|
|
|
# operation: unfold string contents permanently |
324
|
|
|
|
|
|
|
sub unfold ($) { |
325
|
0
|
|
|
0
|
1
|
0
|
my ($self) = @_; |
326
|
0
|
|
|
|
|
0
|
return $self->{diversion}->[-1]->unfold() |
327
|
0
|
0
|
|
|
|
0
|
if (@{$self->{diversion}} > 0); |
328
|
0
|
|
|
|
|
0
|
my $string = $self->string(); |
329
|
0
|
0
|
|
|
|
0
|
$self->{chunks} = $string ne '' ? [ $string ] : []; |
330
|
0
|
|
|
|
|
0
|
$self->{folderlst} = undef; |
331
|
0
|
|
|
|
|
0
|
return $string; |
332
|
|
|
|
|
|
|
} |
333
|
|
|
|
|
|
|
|
334
|
|
|
|
|
|
|
# internal: check whether object is a String::Divert object |
335
|
|
|
|
|
|
|
sub _isobj ($) { |
336
|
29
|
|
|
29
|
|
45
|
my ($obj) = @_; |
337
|
29
|
|
33
|
|
|
116
|
return ( ref($obj) |
338
|
|
|
|
|
|
|
and ( UNIVERSAL::isa($obj, "String::Divert") |
339
|
|
|
|
|
|
|
or UNIVERSAL::isa($obj, "String::Divert::__OVERLOAD__"))); |
340
|
|
|
|
|
|
|
} |
341
|
|
|
|
|
|
|
|
342
|
|
|
|
|
|
|
# internal: compare whether two objects are the same |
343
|
|
|
|
|
|
|
sub _isobjeq ($$) { |
344
|
27
|
|
|
27
|
|
66
|
my ($obj1, $obj2) = @_; |
345
|
27
|
|
|
|
|
120
|
my $ov1 = $obj1->overload(); |
346
|
27
|
|
|
|
|
52
|
my $ov2 = $obj2->overload(); |
347
|
27
|
|
|
|
|
56
|
$obj1->overload(0); |
348
|
27
|
|
|
|
|
51
|
$obj2->overload(0); |
349
|
27
|
|
|
|
|
101
|
my $rv = ($obj1 == $obj2); |
350
|
27
|
|
|
|
|
260
|
$obj1->overload($ov1); |
351
|
27
|
|
|
|
|
52
|
$obj2->overload($ov2); |
352
|
27
|
|
|
|
|
277
|
return $rv; |
353
|
|
|
|
|
|
|
} |
354
|
|
|
|
|
|
|
|
355
|
|
|
|
|
|
|
# operation: lookup particular or all folding sub-object(s) |
356
|
|
|
|
|
|
|
sub folding ($;$) { |
357
|
20
|
|
|
20
|
1
|
38
|
my ($self, $id) = @_; |
358
|
20
|
100
|
|
|
|
40
|
if (defined($id)) { |
359
|
16
|
|
|
|
|
21
|
my $folding; $folding = undef; |
|
16
|
|
|
|
|
19
|
|
360
|
16
|
|
|
|
|
20
|
foreach my $chunk (@{$self->{chunks}}) { |
|
16
|
|
|
|
|
37
|
|
361
|
27
|
100
|
|
|
|
68
|
if (ref($chunk)) { |
362
|
11
|
100
|
33
|
|
|
76
|
if ( (ref($id) and &String::Divert::_isobjeq($chunk, $id)) |
|
|
|
66
|
|
|
|
|
|
|
|
33
|
|
|
|
|
363
|
|
|
|
|
|
|
or (not ref($id) and $chunk->name() eq $id) ) { |
364
|
8
|
|
|
|
|
10
|
$folding = $chunk; |
365
|
8
|
|
|
|
|
15
|
last; |
366
|
|
|
|
|
|
|
} |
367
|
3
|
|
|
|
|
12
|
$folding = $chunk->folding($id); # recursion! |
368
|
3
|
50
|
|
|
|
10
|
last if (defined($folding)); |
369
|
|
|
|
|
|
|
} |
370
|
|
|
|
|
|
|
} |
371
|
16
|
|
|
|
|
44
|
return $folding; |
372
|
|
|
|
|
|
|
} |
373
|
|
|
|
|
|
|
else { |
374
|
4
|
|
|
|
|
6
|
my @foldings = (); |
375
|
4
|
|
|
|
|
19
|
foreach my $chunk (@{$self->{chunks}}) { |
|
4
|
|
|
|
|
11
|
|
376
|
10
|
100
|
|
|
|
28
|
if (ref($chunk)) { |
377
|
3
|
|
|
|
|
139
|
foreach my $subchunk ($chunk->folding()) { |
378
|
2
|
|
|
|
|
5
|
push(@foldings, $subchunk); |
379
|
|
|
|
|
|
|
} |
380
|
3
|
|
|
|
|
7
|
push(@foldings, $chunk); |
381
|
|
|
|
|
|
|
} |
382
|
|
|
|
|
|
|
} |
383
|
4
|
|
|
|
|
16
|
return @foldings; |
384
|
|
|
|
|
|
|
} |
385
|
|
|
|
|
|
|
} |
386
|
|
|
|
|
|
|
|
387
|
|
|
|
|
|
|
# operation: configure or generate textually represented folding object |
388
|
|
|
|
|
|
|
sub folder ($;$$) { |
389
|
1
|
|
|
1
|
1
|
3
|
my ($self, $a, $b) = @_; |
390
|
1
|
50
|
33
|
|
|
8
|
if (defined($a) and defined($b)) { |
391
|
|
|
|
|
|
|
# configure folder |
392
|
1
|
|
|
|
|
8
|
my $test = sprintf($a, "foo"); |
393
|
1
|
|
|
|
|
59
|
my ($id) = ($test =~ m|${b}()|s); |
394
|
1
|
50
|
33
|
|
|
95
|
croak "folder construction format and matching regular expression do not correspond" |
|
|
|
33
|
|
|
|
|
395
|
|
|
|
|
|
|
if (not defined($id) or (defined($id) and $id ne "foo")); |
396
|
1
|
|
|
|
|
3
|
$self->{foldermk} = $a; |
397
|
1
|
|
|
|
|
2
|
$self->{folderre} = $b; |
398
|
1
|
|
|
|
|
5
|
return; |
399
|
|
|
|
|
|
|
} |
400
|
|
|
|
|
|
|
else { |
401
|
|
|
|
|
|
|
# create folder |
402
|
0
|
0
|
|
|
|
0
|
return "" if ($self->{storage} eq 'none'); |
403
|
0
|
0
|
|
|
|
0
|
$a = &String::Divert::_anonymous_name() |
404
|
|
|
|
|
|
|
if (not defined($a)); |
405
|
0
|
|
|
|
|
0
|
my $folder = sprintf($self->{foldermk}, $a); |
406
|
0
|
|
|
|
|
0
|
return $folder; |
407
|
|
|
|
|
|
|
} |
408
|
|
|
|
|
|
|
} |
409
|
|
|
|
|
|
|
|
410
|
|
|
|
|
|
|
# operation: push diversion of operations to sub-object |
411
|
|
|
|
|
|
|
sub divert ($;$) { |
412
|
5
|
|
|
5
|
1
|
17
|
my ($self, $id) = @_; |
413
|
5
|
|
|
|
|
6
|
my $object; $object = undef; |
|
5
|
|
|
|
|
7
|
|
414
|
5
|
50
|
|
|
|
13
|
if (not defined($id)) { |
415
|
|
|
|
|
|
|
# choose last folding object |
416
|
0
|
|
|
|
|
0
|
foreach my $obj (reverse ($self, @{$self->{diversion}})) { |
|
0
|
|
|
|
|
0
|
|
417
|
0
|
|
|
|
|
0
|
$object = $obj->{folderlst}; |
418
|
0
|
0
|
|
|
|
0
|
last if (defined($object)); |
419
|
|
|
|
|
|
|
} |
420
|
0
|
0
|
|
|
|
0
|
croak "no last folding sub-object found" |
421
|
|
|
|
|
|
|
if (not defined($object)); |
422
|
|
|
|
|
|
|
} |
423
|
|
|
|
|
|
|
else { |
424
|
|
|
|
|
|
|
# choose named folding object |
425
|
5
|
|
|
|
|
12
|
$object = $self->folding($id); |
426
|
5
|
50
|
|
|
|
14
|
croak "folding sub-object \"$id\" not found" |
427
|
|
|
|
|
|
|
if (not defined($object)); |
428
|
|
|
|
|
|
|
} |
429
|
5
|
|
|
|
|
8
|
push(@{$self->{diversion}}, $object); |
|
5
|
|
|
|
|
13
|
|
430
|
5
|
|
|
|
|
11
|
return $self; |
431
|
|
|
|
|
|
|
} |
432
|
|
|
|
|
|
|
|
433
|
|
|
|
|
|
|
# operation: pop diversion of operations to sub-object |
434
|
|
|
|
|
|
|
sub undivert ($;$) { |
435
|
4
|
|
|
4
|
1
|
290
|
my ($self, $num) = @_; |
436
|
4
|
100
|
|
|
|
15
|
$num = 1 if (not defined($num)); |
437
|
4
|
50
|
|
|
|
23
|
if ($num !~ m|^\d+$|) { |
438
|
|
|
|
|
|
|
# lookup number by name |
439
|
0
|
|
|
|
|
0
|
my $name = $num; |
440
|
0
|
|
|
|
|
0
|
for (my $num = 1; $num <= @{$self->{diversion}}; $num++) { |
|
0
|
|
|
|
|
0
|
|
441
|
0
|
0
|
|
|
|
0
|
last if ($self->{diversion}->[-$num]->{name} eq $name); |
442
|
|
|
|
|
|
|
} |
443
|
0
|
|
|
|
|
0
|
croak "no object named \"$name\" found for undiversion" |
444
|
0
|
0
|
|
|
|
0
|
if ($num > @{$self->{diversion}}); |
445
|
|
|
|
|
|
|
} |
446
|
4
|
100
|
|
|
|
18
|
$num = @{$self->{diversion}} if ($num == 0); |
|
2
|
|
|
|
|
5
|
|
447
|
0
|
|
|
|
|
0
|
croak "less number (".scalar(@{$self->{diversion}}).") of " . |
|
4
|
|
|
|
|
15
|
|
448
|
|
|
|
|
|
|
"diversions active than requested ($num) to undivert" |
449
|
4
|
50
|
|
|
|
7
|
if ($num > @{$self->{diversion}}); |
450
|
4
|
|
|
|
|
14
|
while ($num-- > 0) { |
451
|
5
|
|
|
|
|
6
|
pop(@{$self->{diversion}}); |
|
5
|
|
|
|
|
16
|
|
452
|
|
|
|
|
|
|
} |
453
|
4
|
|
|
|
|
9
|
return $self; |
454
|
|
|
|
|
|
|
} |
455
|
|
|
|
|
|
|
|
456
|
|
|
|
|
|
|
# operation: lookup last or all diversion(s) |
457
|
|
|
|
|
|
|
sub diversion ($) { |
458
|
2
|
|
|
2
|
1
|
7
|
my ($self) = @_; |
459
|
2
|
50
|
|
|
|
6
|
if (not wantarray) { |
460
|
|
|
|
|
|
|
# return last diversion only (or undef if none exist) |
461
|
0
|
|
|
|
|
0
|
return $self->{diversion}->[-1]; |
462
|
|
|
|
|
|
|
} |
463
|
|
|
|
|
|
|
else { |
464
|
|
|
|
|
|
|
# return all diversions (in reverse order of activation) (or empty array if none exist) |
465
|
2
|
|
|
|
|
2
|
return reverse(@{$self->{diversion}}); |
|
2
|
|
|
|
|
9
|
|
466
|
|
|
|
|
|
|
} |
467
|
|
|
|
|
|
|
} |
468
|
|
|
|
|
|
|
|
469
|
|
|
|
|
|
|
# _________________________________________________________________________ |
470
|
|
|
|
|
|
|
# |
471
|
|
|
|
|
|
|
# API SWITCHING |
472
|
|
|
|
|
|
|
# _________________________________________________________________________ |
473
|
|
|
|
|
|
|
# |
474
|
|
|
|
|
|
|
|
475
|
|
|
|
|
|
|
# object overloading toogle method |
476
|
|
|
|
|
|
|
sub overload ($;$) { |
477
|
|
|
|
|
|
|
# NOTICE: This function is special in that it exploits the fact |
478
|
|
|
|
|
|
|
# that Perl's @_ contains just ALIASES for the arguments of |
479
|
|
|
|
|
|
|
# the function and hence the function can adjust them. This |
480
|
|
|
|
|
|
|
# allows us to tie() the variable of our object ($_[0]) into the |
481
|
|
|
|
|
|
|
# overloading sub class or back to our main class. Just tie()ing |
482
|
|
|
|
|
|
|
# a copy of $_[0] (usually named $self in the other methods) |
483
|
|
|
|
|
|
|
# would be useless, because the Perl TIE mechanism is attached to |
484
|
|
|
|
|
|
|
# _variables_ and not to the objects itself. Hence this function |
485
|
|
|
|
|
|
|
# does no "my ($self, $mode) = @_;" and instead uses @_ directly |
486
|
|
|
|
|
|
|
# throughout its body. |
487
|
177
|
100
|
|
177
|
1
|
934
|
my $old_mode = (ref($_[0]) eq "String::Divert" ? 0 : 1); |
488
|
177
|
100
|
|
|
|
477
|
if (defined($_[1])) { |
489
|
120
|
100
|
|
|
|
276
|
if ($_[1]) { |
490
|
|
|
|
|
|
|
# bless and tie into overloaded subclass |
491
|
5
|
|
|
|
|
7
|
my $self = $_[0]; |
492
|
5
|
|
|
|
|
15
|
bless $_[0], "String::Divert::__OVERLOAD__"; |
493
|
|
|
|
|
|
|
#tie $_[0], "String::Divert::__OVERLOAD__", $self; |
494
|
|
|
|
|
|
|
# according to "BUGS" section in "perldoc overload": |
495
|
|
|
|
|
|
|
# "Relation between overloading and tie()ing is broken. |
496
|
|
|
|
|
|
|
# Overloading is triggered or not basing on the previous |
497
|
|
|
|
|
|
|
# class of tie()d value. This happens because the presence |
498
|
|
|
|
|
|
|
# of overloading is checked too early, before any tie()d |
499
|
|
|
|
|
|
|
# access is attempted. If the FETCH()ed class of the |
500
|
|
|
|
|
|
|
# tie()d value does not change, a simple workaround is to |
501
|
|
|
|
|
|
|
# access the value immediately after tie()ing, so that |
502
|
|
|
|
|
|
|
# after this call the previous class coincides with the |
503
|
|
|
|
|
|
|
# current one."... So, do this now! |
504
|
|
|
|
|
|
|
#my $dummy = ref($_[0]); |
505
|
|
|
|
|
|
|
} |
506
|
|
|
|
|
|
|
else { |
507
|
|
|
|
|
|
|
# untie and rebless into master class |
508
|
|
|
|
|
|
|
#untie $_[0]; |
509
|
115
|
|
|
|
|
605
|
bless $_[0], "String::Divert"; |
510
|
|
|
|
|
|
|
} |
511
|
|
|
|
|
|
|
} |
512
|
177
|
|
|
|
|
254
|
return $old_mode; |
513
|
|
|
|
|
|
|
} |
514
|
|
|
|
|
|
|
|
515
|
|
|
|
|
|
|
# _________________________________________________________________________ |
516
|
|
|
|
|
|
|
# |
517
|
|
|
|
|
|
|
# OPERATOR OVERLOADING API |
518
|
|
|
|
|
|
|
# _________________________________________________________________________ |
519
|
|
|
|
|
|
|
# |
520
|
|
|
|
|
|
|
|
521
|
|
|
|
|
|
|
package String::Divert::__OVERLOAD__; |
522
|
|
|
|
|
|
|
|
523
|
|
|
|
|
|
|
our @ISA = qw(Exporter String::Divert); |
524
|
|
|
|
|
|
|
our @EXPORT = qw(); |
525
|
|
|
|
|
|
|
our @EXPORT_OK = qw(); |
526
|
|
|
|
|
|
|
|
527
|
|
|
|
|
|
|
# define operator overloading |
528
|
|
|
|
|
|
|
use overload ( |
529
|
1
|
|
|
|
|
14
|
'""' => \&op_string, |
530
|
|
|
|
|
|
|
'bool' => \&op_bool, |
531
|
|
|
|
|
|
|
'0+' => \&op_numeric, |
532
|
|
|
|
|
|
|
'.' => \&op_concat, |
533
|
|
|
|
|
|
|
'.=' => \&op_append, |
534
|
|
|
|
|
|
|
'*=' => \&op_fold, |
535
|
|
|
|
|
|
|
'<>' => \&op_unfold, |
536
|
|
|
|
|
|
|
'>>' => \&op_divert, |
537
|
|
|
|
|
|
|
'<<' => \&op_undivert, |
538
|
|
|
|
|
|
|
'=' => \&op_copyconst, |
539
|
|
|
|
|
|
|
#'${}' => \&op_deref_string, |
540
|
|
|
|
|
|
|
#'%{}' => \&op_deref_hash, |
541
|
|
|
|
|
|
|
#'nomethod' => \&op_unknown, |
542
|
|
|
|
|
|
|
'fallback' => 0 |
543
|
1
|
|
|
1
|
|
2270
|
); |
|
1
|
|
|
|
|
1081
|
|
544
|
|
|
|
|
|
|
|
545
|
|
|
|
|
|
|
#sub TIESCALAR ($$) { |
546
|
|
|
|
|
|
|
# my ($class, $self) = @_; |
547
|
|
|
|
|
|
|
# bless $self, $class; |
548
|
|
|
|
|
|
|
# return $self; |
549
|
|
|
|
|
|
|
#} |
550
|
|
|
|
|
|
|
|
551
|
|
|
|
|
|
|
#sub UNTIE ($) { |
552
|
|
|
|
|
|
|
# my ($self) = @_; |
553
|
|
|
|
|
|
|
# return; |
554
|
|
|
|
|
|
|
#} |
555
|
|
|
|
|
|
|
|
556
|
|
|
|
|
|
|
#sub FETCH ($) { |
557
|
|
|
|
|
|
|
# my ($self) = @_; |
558
|
|
|
|
|
|
|
# return $self; |
559
|
|
|
|
|
|
|
#} |
560
|
|
|
|
|
|
|
|
561
|
|
|
|
|
|
|
#sub STORE ($$) { |
562
|
|
|
|
|
|
|
# my ($self, $other) = @_; |
563
|
|
|
|
|
|
|
# return $self if (ref($other)); |
564
|
|
|
|
|
|
|
# $self->assign($other); |
565
|
|
|
|
|
|
|
# my $dummy = ref($self); |
566
|
|
|
|
|
|
|
# return $self; |
567
|
|
|
|
|
|
|
#} |
568
|
|
|
|
|
|
|
|
569
|
|
|
|
|
|
|
#sub op_deref_string ($$$) { |
570
|
|
|
|
|
|
|
# my $self = shift; |
571
|
|
|
|
|
|
|
# return $self; |
572
|
|
|
|
|
|
|
#} |
573
|
|
|
|
|
|
|
|
574
|
|
|
|
|
|
|
#sub op_deref_hash ($$$) { |
575
|
|
|
|
|
|
|
# my $self = shift; |
576
|
|
|
|
|
|
|
# return $self; |
577
|
|
|
|
|
|
|
#} |
578
|
|
|
|
|
|
|
|
579
|
|
|
|
|
|
|
sub op_copyconst { |
580
|
0
|
|
|
0
|
|
0
|
my ($self, $other, $reverse) = @_; |
581
|
0
|
0
|
|
|
|
0
|
if ($self->{copying} eq 'pass') { |
582
|
|
|
|
|
|
|
# object is just passed-through |
583
|
0
|
|
|
|
|
0
|
return $self; |
584
|
|
|
|
|
|
|
} |
585
|
|
|
|
|
|
|
else { |
586
|
|
|
|
|
|
|
# object is recursively cloned |
587
|
0
|
|
|
|
|
0
|
return $self->clone(); |
588
|
|
|
|
|
|
|
} |
589
|
|
|
|
|
|
|
} |
590
|
|
|
|
|
|
|
|
591
|
|
|
|
|
|
|
sub op_string ($$$) { |
592
|
5
|
|
|
5
|
|
19
|
my ($self, $other, $rev) = @_; |
593
|
5
|
|
|
|
|
20
|
return $self->string(); |
594
|
|
|
|
|
|
|
} |
595
|
|
|
|
|
|
|
|
596
|
|
|
|
|
|
|
sub op_bool ($$$) { |
597
|
0
|
|
|
0
|
|
0
|
my ($self, $other, $reverse) = @_; |
598
|
0
|
|
|
|
|
0
|
return $self->bool(); |
599
|
|
|
|
|
|
|
} |
600
|
|
|
|
|
|
|
|
601
|
|
|
|
|
|
|
sub op_numeric ($$$) { |
602
|
0
|
|
|
0
|
|
0
|
my ($self, $other, $reverse) = @_; |
603
|
0
|
|
|
|
|
0
|
return $self->string(); |
604
|
|
|
|
|
|
|
} |
605
|
|
|
|
|
|
|
|
606
|
|
|
|
|
|
|
sub op_concat ($$$) { |
607
|
0
|
|
|
0
|
|
0
|
my ($self, $other, $reverse) = @_; |
608
|
0
|
0
|
|
|
|
0
|
return ($reverse ? $other . $self->string() : $self->string() . $other); |
609
|
|
|
|
|
|
|
} |
610
|
|
|
|
|
|
|
|
611
|
|
|
|
|
|
|
sub op_append ($$$) { |
612
|
3
|
|
|
3
|
|
14
|
my ($self, $other, $reverse) = @_; |
613
|
3
|
|
|
|
|
18
|
$self->append($other); |
614
|
3
|
|
|
|
|
9
|
return $self; |
615
|
|
|
|
|
|
|
} |
616
|
|
|
|
|
|
|
|
617
|
|
|
|
|
|
|
sub op_fold ($$$) { |
618
|
1
|
|
|
1
|
|
3
|
my ($self, $other, $reverse) = @_; |
619
|
1
|
|
|
|
|
9
|
$self->fold($other); |
620
|
1
|
|
|
|
|
4
|
return $self; |
621
|
|
|
|
|
|
|
} |
622
|
|
|
|
|
|
|
|
623
|
|
|
|
|
|
|
sub op_unfold ($$$) { |
624
|
0
|
|
|
0
|
|
0
|
my ($self, $other, $reverse) = @_; |
625
|
0
|
|
|
|
|
0
|
$self->unfold; |
626
|
0
|
|
|
|
|
0
|
return $self; |
627
|
|
|
|
|
|
|
} |
628
|
|
|
|
|
|
|
|
629
|
|
|
|
|
|
|
#sub op_folding ($$$) { |
630
|
|
|
|
|
|
|
# my ($self, $other, $reverse) = @_; |
631
|
|
|
|
|
|
|
# $self->folding($other); |
632
|
|
|
|
|
|
|
# return $self; |
633
|
|
|
|
|
|
|
#} |
634
|
|
|
|
|
|
|
|
635
|
|
|
|
|
|
|
sub op_divert ($$$) { |
636
|
1
|
|
|
1
|
|
4
|
my ($self, $other, $reverse) = @_; |
637
|
1
|
|
|
|
|
10
|
$self->divert($other); |
638
|
1
|
|
|
|
|
3
|
return $self; |
639
|
|
|
|
|
|
|
} |
640
|
|
|
|
|
|
|
|
641
|
|
|
|
|
|
|
sub op_undivert ($$$) { |
642
|
1
|
|
|
1
|
|
7
|
my ($self, $other, $reverse) = @_; |
643
|
1
|
|
|
|
|
9
|
$self->undivert($other); |
644
|
1
|
|
|
|
|
4
|
return $self; |
645
|
|
|
|
|
|
|
} |
646
|
|
|
|
|
|
|
|
647
|
|
|
|
|
|
|
#sub op_diversion ($$$) { |
648
|
|
|
|
|
|
|
# my ($self, $other, $reverse) = @_; |
649
|
|
|
|
|
|
|
# $self->diversion(); |
650
|
|
|
|
|
|
|
# return $self; |
651
|
|
|
|
|
|
|
#} |
652
|
|
|
|
|
|
|
|
653
|
|
|
|
|
|
|
#sub op_unknown ($$$$) { |
654
|
|
|
|
|
|
|
# my ($self, $other, $rev, $op) = @_; |
655
|
|
|
|
|
|
|
# print ": op=$op\n"; |
656
|
|
|
|
|
|
|
# return $self; |
657
|
|
|
|
|
|
|
#} |
658
|
|
|
|
|
|
|
|
659
|
|
|
|
|
|
|
1; |
660
|
|
|
|
|
|
|
|