Mercurial > pub > Impl

annotate Lib/IMPL/declare.pm @ 279:af8af4b8337e

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author sergey
date Mon, 04 Feb 2013 17:16:45 +0400
parents 4ddb27ff4a0b
children c6d0f889ef87
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1 package IMPL::declare;
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2 use strict;
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3
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4 use Scalar::Util qw(set_prototype);
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5 use Carp qw(carp);
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6 use IMPL::Class::PropertyInfo();
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7 use IMPL::Const qw(:access);
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8 use IMPL::require();
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9
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10 BEGIN {
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11 *_require = *IMPL::require::_require;
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12 *_trace = *IMPL::require::_trace;
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13 }
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14
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15 sub import {
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16 my ( $self, $args ) = @_;
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17
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18 return unless $args;
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19
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20 die "A hash reference is required" unless ref $args eq 'HASH';
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21
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22 no strict 'refs';
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23
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24 my $caller = caller;
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25
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26 my $aliases = $args->{require} || {};
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27
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28 $IMPL::require::PENDING{$caller} = 1;
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29 _trace("declare $caller");
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30 $IMPL::require::level++;
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31
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32 while ( my ( $alias, $class ) = each %$aliases ) {
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33 _trace("$alias => $class");
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34 $IMPL::require::level ++;
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35 my $c = _require($class);
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36
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37 *{"${caller}::$alias"} = set_prototype(
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38 sub {
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39 $c;
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40 },
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41 ''
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42 );
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43 $IMPL::require::level --;
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44 }
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45
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46 my $base = $args->{base} || {};
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47
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48 my %ctor;
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49 my @isa;
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50
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51 if ( ref $base eq 'ARRAY' ) {
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52 carp "Odd elements number in require"
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53 unless scalar(@$base) % 2 == 0;
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54 while ( my ( $class, $mapper ) = splice @$base, 0, 2 ) {
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55 _trace("parent $class");
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56 $IMPL::require::level ++;
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57 $class = $aliases->{$class} || _require($class);
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58 $IMPL::require::level --;
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59
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60 push @isa, $class;
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61 $ctor{$class} = $mapper;
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62 }
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63 }
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64 elsif ( ref $base eq 'HASH' ) {
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65 while ( my ( $class, $mapper ) = each %$base ) {
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66 _trace("parent $class");
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67 $IMPL::require::level ++;
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68 $class = $aliases->{$class} || _require($class);
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69 $IMPL::require::level --;
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70
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71 push @isa, $class;
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72 $ctor{$class} = $mapper;
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73 }
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74 }
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75
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76 %{"${caller}::CTOR"} = %ctor;
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77 push @{"${caller}::ISA"}, @isa;
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78
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79 if(ref($args->{meta}) eq 'ARRAY') {
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80 $caller->SetMeta($_) foreach @{$args->{meta}};
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81 }
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82
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83 my $props = $args->{props} || [];
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84
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85 if ( $props eq 'HASH' ) {
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86 $props = [%$props];
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87 }
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88
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89 die "A hash or an array reference is required in the properties list"
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90 unless ref $props eq 'ARRAY';
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91
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92 carp "Odd elements number in properties declaration of $caller"
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93 unless scalar(@$props) % 2 == 0;
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94
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95 if (@$props) {
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96 $self->_implementProps($props,$caller);
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97 }
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98
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99 if ($args->{_implement}) {
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100 $self->_implementProps($caller->abstractProps,$caller);
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101 }
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102
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103 $IMPL::require::level--;
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104 delete $IMPL::require::PENDING{$caller};
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105 }
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106
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107 sub _implementProps {
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108 my ($self, $props, $caller) = @_;
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109
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110 for ( my $i = 0 ; $i < @$props - 1 ; $i = $i + 2 ) {
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111 my ( $prop, $spec ) = @{$props}[ $i, $i + 1 ];
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112
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113 $caller->ClassPropertyImplementor->Implement(
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114 $spec,
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115 {
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116 name => $prop,
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117 class => $caller,
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118 access => $prop =~ /^_/
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119 ? ACCESS_PRIVATE
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120 : ACCESS_PUBLIC
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121 }
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122 );
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123 }
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124 }
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125
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126 1;
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127
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128 __END__
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129
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130 =pod
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131
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132 =head1 NAME
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133
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134 C<IMPL::declare> - описывает класс
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135
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136 =head1 SYNOPSIS
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137
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138 =begin code
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139
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140 package My::Bar;
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141
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142 use IMPL::declare {
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143 require => {
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144 TFoo => 'My::Foo',
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145 TBox => 'My::Box'
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146 },
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147 base => {
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148 TFoo => '@_',
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149 'IMPL::Object' => undef,
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150 }
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151 }
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152
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153 sub CreateBox {
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154 my ($this) = @_;
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155 return TBox->new($this);
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156 }
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157
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158 =end code
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159
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160 Специальная ситрока C<@_> означает передачу параметров конструктора текущего класса конструктору
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161 базового класса без изменений.
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162
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163 =head1 DESCRIPTION
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164
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165 Описывает текущий пакет(модуль) как класс. В качестве параметра получает ссылку на хеш,
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166 в которой храняться метаданные для объявления класса.
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167
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168 =head1 METADATA
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169
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170 =head2 C<require>
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171
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172 Содержит ссылку на хеш с синонимами модулей, которые будут доступны в текушем модуле,
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173 аналогично использованию C<IMPL::require>. Однако, если модуль не требует загрузки при
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174 помощи C<require> нужно использовать префикс C<'-'> в его имени
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175
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176 =begin code
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177
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178 {
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179 require => {
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180 TObject => 'IMPL::Object', # will be loaded with require
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181 TFoo => '-My:App::Data::Foo' # will not use 'require' to load module
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182 }
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183 }
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184
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185 =end code
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186
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187 =head2 C<base>
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188
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189 Обисывает базове классы для текущего класса. Если данный параметр - ссылка массив, то
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190 этот массив будет превращен в массив C<@ISA>. Если данный параметр - ссылка на хеш, то
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191 его ключи опичавют список базовых классов, а значения - преобразование параметров для
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192 вызова базовых конструкторов.
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193
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194 В качестве имен базовых классов могут быть как полные имена модулей, так и назначенные
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195 ранее псевдонимы. Использование префикса C<'-'> перед B<полным именем модуля> означает,
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196 что модуль не требуется загружать, в случае с псевдонимами, префикс C<'-'> уже был указан
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197 при их объявлении.
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198
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199 =begin code
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200
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201 {
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202 require => {
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203 TFoo => '-My:App::Data::Foo' # will not use 'require' to load module
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204 },
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205 base => {
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206 TFoo => '@_', # pass parameters unchanged
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207 'My::Base::Class' => sub { name => $_[0], data => $_[1] }, # remap parameters
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208 '-My::Extentions' => undef, # do not pass any parameters
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209 }
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210 }
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211
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212 =end code
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213
228
431db7034a88 Для синхронизации
andrei <andrei@nap21.upri>
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214 =cut