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# reform.pm
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#
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# Third millenium syntax for Perl 5 OOP.
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# Written by Henning Koch .
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36128
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use strict;
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103
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package reform;
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our $VERSION = 0.3;
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4414
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use Filter::Simple;
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46171
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# Filters the code of a package.
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# This is going to be even more ugly than usual as we
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# want to preserve whitespace so line numbers won't change.
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sub process
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{
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my ($code) = @_;
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1
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$code =~ s/ \b fields (\s+) ([\w\s\,]+) (\s*) \;
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/$1 . process_fields($2) . $3
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/xse;
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$code =~ s/ \b sub (\s+) (\w+) (\s*) # 1:space 2:subname 3:space
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(\( (.*?) \))? (\s*) # 4:paramsbracket 5:params 6:space
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(: \s* \w+ (\(\w+\))? )? (\s*) \{ # 7:fullattr 8:attrparam 9:space
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/ "sub" . $1 . $2 . $3 .
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$7 . $9 . $6 .
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"{ my(\$self" . ($5? ", $5" : "") . ") = \@_; "
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31
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/xseg;
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1
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3
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$code =~ s/ \b package (\s+) ([\w\:]+)
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((\s*) \< (\s*) ([\w\:\,\s]+))? (\s*) \;
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/
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0
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"package" . $1 . $2 . "; " .
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37
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"use strict; no strict 'subs'; " .
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38
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$4 . $5 .
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39
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process_bases($6) .
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40
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"use base 'Class'; " .
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41
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"use reform::implicit; " .
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$7
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/xse;
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44
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45
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# print "-----------------\n$code\n-----------\n";
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46
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47
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1
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9
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$code . "\n1;";
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48
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49
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}
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50
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51
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# Processes a "fields" directive.
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sub process_fields
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53
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{
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54
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0
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my($list) = @_;
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55
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56
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0
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$list =~ s/(\w+) ([\s,]*)
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57
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0
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/"class->add_field('$1'); " . remove_commas($2)
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58
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/gesx;
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59
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60
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0
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$list;
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61
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}
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62
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63
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# Processes inheritance directives.
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64
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sub process_bases
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65
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{
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66
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0
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0
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my($list) = @_;
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67
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68
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0
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$list =~ s/([\w\:]+) ([\s,]*)
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69
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0
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/"use base '$1'; " . remove_commas($2)
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70
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/gesx;
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71
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72
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0
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$list;
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73
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}
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74
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75
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76
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# Removes commas from a string.
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77
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sub remove_commas
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78
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{
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79
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0
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0
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0
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my($str) = @_;
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80
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0
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$str =~ s/,//g;
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81
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0
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$str;
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82
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}
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83
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84
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85
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# Called upon use.
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86
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FILTER
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87
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{
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88
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s/^(.*)$/process($1)/es;
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89
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}
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90
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91
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"";
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92
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93
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94
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# Every reformed package inherits from Class.
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95
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package Class;
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96
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97
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1
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1
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4007
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use reform::Property;
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1
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23
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1
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3042
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98
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99
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# Saves fields by class
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100
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my %fields;
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101
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102
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# Basic constructor. When you need custom contructors,
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103
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# don't overwrite this - overwrite "initialize".
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104
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sub new
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105
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{
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106
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0
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0
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my $class = shift;
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107
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0
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my $self = {};
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108
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0
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bless($self, $class);
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109
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0
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$self->_tie_field($_) for $self->fields;
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110
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0
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$self->initialize(@_);
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111
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0
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$self;
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112
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}
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113
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114
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115
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# Called by constructor. When you need custom contructors,
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116
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# overwrite this method rather than "new".
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117
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sub initialize
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118
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0
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0
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{
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119
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}
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120
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121
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# Create accessors for a field.
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122
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# The accessors actually work on self->{_field}, which is "tied"
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123
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# to self->{field} through the methods get_field and set_field.
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124
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sub add_field
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125
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{
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126
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0
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0
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my($self, $field) = @_;
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127
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0
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my $class = $self;
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128
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0
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0
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ref $class and $class = ref $class;
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129
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0
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eval "sub $class\:\:$field : lvalue { \$_[0]->{_$field} }";
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130
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0
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0
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eval "sub $class\:\:get_$field { \$_[0]->{_$field} }"
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131
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unless $class->can("get_$field");
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132
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0
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0
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eval "sub $class\:\:set_$field { \$_[0]->{_$field} = \$_[1] }"
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133
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unless $class->can("set_$field");
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134
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0
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0
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$@ and die "Could not add field $field for class $class: $@";
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135
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0
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push @{$fields{$class}}, $field;
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0
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136
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0
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0
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ref $self and $self->_tie_field($field);
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137
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}
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138
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139
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# Goes through all classes in %fields and returns fields
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140
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# of any class that is a parent of self (or is self's class).
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141
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sub fields
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142
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{
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143
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0
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0
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my($self) = @_;
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144
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0
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my %re; # Hash to weed out duplicates
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145
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0
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foreach my $class (keys %fields) {
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146
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0
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0
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if($self->isa($class)) {
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147
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0
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map { $re{$_} = 1 } @{$fields{$class}};
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0
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0
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148
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}
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149
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}
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150
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0
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keys %re;
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151
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}
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152
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153
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# Ties getter/setter methods to a field accessor.
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154
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sub _tie_field
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155
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{
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156
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0
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0
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my($self, $field) = @_;
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157
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0
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tie $self->{"_$field"}, 'reform::Property', $self, $field;
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158
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}
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159
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160
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#sub _call_base_method
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161
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#{
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162
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# my($self, $method) = (shift, shift);
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163
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# my $class = $self;
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164
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# ref $class and $class = ref $class;
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165
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# print "$self\n";
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166
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# my @re = eval "package $class; \$self->SUPER::$method(\@_)";
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167
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# $@ and die "Error calling base method: $@";
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168
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# @re;
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169
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#}
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170
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171
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172
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=head1 NAME
|
173
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|
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|
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|
174
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|
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reform - Third millenium syntax for Perl 5 OOP
|
175
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176
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=head1 SYNOPSIS
|
177
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178
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use reform;
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179
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180
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package Class < Base;
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181
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182
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fields foo,
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183
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bar,
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184
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baz;
|
185
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186
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sub initialize($foo, $bar, $baz)
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187
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{
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188
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base->initialize($foo);
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189
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self->foo = $foo;
|
190
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self->bar = $bar;
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191
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self->baz = $baz;
|
192
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}
|
193
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|
194
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sub method
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195
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{
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196
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print "Hi there";
|
197
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class->static_method();
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198
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}
|
199
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200
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sub get_foo
|
201
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{
|
202
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print "Getting self->foo!";
|
203
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return self->{foo};
|
204
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}
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205
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206
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sub set_foo($value)
|
207
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{
|
208
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print "Setting self->foo!";
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209
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self->{foo} = $value;
|
210
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}
|
211
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212
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=head1 DESCRIPTION
|
213
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214
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This module provides a less awkward syntax for Perl 5 OOP.
|
215
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C must be the B thing to be used in your code,
|
216
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|
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even above your package declaration.
|
217
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218
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=head2 Shorthand inheritance
|
219
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220
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Rather than using the cumbersome C |
221
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222
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package Child < Parent;
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224
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=head2 Shorthand parameters
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225
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226
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It is no longer necessary to fish method parameters out of C<@_>:
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227
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228
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sub method($foo, $bar)
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229
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{
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230
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print "First param: $foo";
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print "Second param: $bar";
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}
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234
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=head2 Implicit self, class and base
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236
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References to the instance, the class (package) and the base class
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are implicitely provided as C, C and C:
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238
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239
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sub method
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{
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self->instance_method();
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class->static_method();
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base->super_class_method();
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}
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246
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=head2 Pretty field accessors
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247
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248
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You may omit the curly brackets in C{foo}> if you declare
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your field names using C:
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251
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fields foo, bar;
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253
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sub method {
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self->foo = "some value";
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255
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print self->foo;
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256
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}
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257
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258
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You may intercept read and write access to instance fields by overwriting
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getter and setter methods:
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261
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fields foo;
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262
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263
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sub get_foo
|
264
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{
|
265
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print "Getting foo!";
|
266
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return self->{foo};
|
267
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}
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268
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269
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sub set_foo($value)
|
270
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{
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271
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print "Setting foo!";
|
272
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self->{foo} = $value;
|
273
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}
|
274
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275
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Note that you must wrap the field names in curly brackets
|
276
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to access the actual C{foo}> inside of getter and
|
277
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setter methods.
|
278
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279
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=head2 Clean constructors
|
280
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281
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All reformed packages inherit a basic constructor C from the C package.
|
282
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When you need custom contructors, don't overwrite C - overwrite C:
|
283
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284
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use reform;
|
285
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package Amy;
|
286
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|
287
|
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fields foo,
|
288
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bar;
|
289
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|
290
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|
sub initialize($foo)
|
291
|
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|
|
{
|
292
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|
self->foo = $foo;
|
293
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|
|
}
|
294
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|
295
|
|
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|
|
You may call the constructor of a base class by calling Cinitialize()>.
|
296
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|
297
|
|
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|
|
=head2 Dynamically adding field accessors
|
298
|
|
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|
299
|
|
|
|
|
|
|
When you need to dynamically add field accessors, use Cadd_field($field)>:
|
300
|
|
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|
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|
|
301
|
|
|
|
|
|
|
sub method
|
302
|
|
|
|
|
|
|
{
|
303
|
|
|
|
|
|
|
self->add_field('boo');
|
304
|
|
|
|
|
|
|
self->boo = 55;
|
305
|
|
|
|
|
|
|
}
|
306
|
|
|
|
|
|
|
|
307
|
|
|
|
|
|
|
Note that all objects constructed after a use of C will also
|
308
|
|
|
|
|
|
|
bear the new accessors.
|
309
|
|
|
|
|
|
|
|
310
|
|
|
|
|
|
|
You may request a list of all fields currently assigned to a class by
|
311
|
|
|
|
|
|
|
calling Cfields> or Cfields>;
|
312
|
|
|
|
|
|
|
|
313
|
|
|
|
|
|
|
=head1 INSTALLING
|
314
|
|
|
|
|
|
|
|
315
|
|
|
|
|
|
|
This package should have come with three files:
|
316
|
|
|
|
|
|
|
C, C and C.
|
317
|
|
|
|
|
|
|
|
318
|
|
|
|
|
|
|
The only somewhat exotic CPAN package you will need to run this
|
319
|
|
|
|
|
|
|
is C >.
|
320
|
|
|
|
|
|
|
This package comes included with Perl 5.8, so you only need to act when you're running Perl 5.6.
|
321
|
|
|
|
|
|
|
|
322
|
|
|
|
|
|
|
=head2 Installing Filter::Simple on Windows
|
323
|
|
|
|
|
|
|
|
324
|
|
|
|
|
|
|
Open a command prompt and type:
|
325
|
|
|
|
|
|
|
|
326
|
|
|
|
|
|
|
ppm install Filter
|
327
|
|
|
|
|
|
|
ppm install Text-Balanced
|
328
|
|
|
|
|
|
|
|
329
|
|
|
|
|
|
|
Now copy the document at L
|
330
|
|
|
|
|
|
|
to C or wherever you store your packages.
|
331
|
|
|
|
|
|
|
|
332
|
|
|
|
|
|
|
=head2 Installing Filter::Simple anywhere else
|
333
|
|
|
|
|
|
|
|
334
|
|
|
|
|
|
|
I guess copying C, C, C and all their prerequisites
|
335
|
|
|
|
|
|
|
from CPAN should work.
|
336
|
|
|
|
|
|
|
|
337
|
|
|
|
|
|
|
=head1 EXPORTS
|
338
|
|
|
|
|
|
|
|
339
|
|
|
|
|
|
|
C, C, C.
|
340
|
|
|
|
|
|
|
|
341
|
|
|
|
|
|
|
=head1 BUGS
|
342
|
|
|
|
|
|
|
|
343
|
|
|
|
|
|
|
Plenty I'm sure.
|
344
|
|
|
|
|
|
|
|
345
|
|
|
|
|
|
|
=head1 UPDATES
|
346
|
|
|
|
|
|
|
|
347
|
|
|
|
|
|
|
Will be posted to CPAN.
|
348
|
|
|
|
|
|
|
|
349
|
|
|
|
|
|
|
=head1 COPYRIGHT
|
350
|
|
|
|
|
|
|
|
351
|
|
|
|
|
|
|
Copyright (C) 2004 Henning Koch. All rights reserved.
|
352
|
|
|
|
|
|
|
|
353
|
|
|
|
|
|
|
This library is free software; you can redistribute it and/or modify
|
354
|
|
|
|
|
|
|
it under the same terms as Perl itself.
|
355
|
|
|
|
|
|
|
|
356
|
|
|
|
|
|
|
=head1 AUTHOR
|
357
|
|
|
|
|
|
|
|
358
|
|
|
|
|
|
|
Henning Koch
|
359
|
|
|
|
|
|
|
|
360
|
|
|
|
|
|
|
=cut
|
361
|
|
|
|
|
|
|
|
362
|
|
|
|
|
|
|
1;
|