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annotate Lib/IMPL/declare.pm @ 306:d4caf951260d

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author cin
date Wed, 17 Apr 2013 19:33:07 +0400
parents a8dbddf491dd
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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 no warnings 'once';
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24
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25 my $caller = caller;
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26
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27 my $aliases = $args->{require} || {};
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28
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29 $IMPL::require::PENDING{$caller} = 1;
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30 _trace("declare $caller");
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31 $IMPL::require::level++;
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32
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33 while ( my ( $alias, $class ) = each %$aliases ) {
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34 _trace("$alias => $class");
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35 $IMPL::require::level ++;
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36 my $c = _require($class);
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37
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38 *{"${caller}::$alias"} = set_prototype(
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39 sub {
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40 $c;
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41 },
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42 ''
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43 );
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44 $IMPL::require::level --;
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45 }
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46
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47 my $base = $args->{base} || {};
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48
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49 my %ctor;
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50 my @isa;
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51
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52 if ( ref $base eq 'ARRAY' ) {
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53 carp "Odd elements number in require"
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54 unless scalar(@$base) % 2 == 0;
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55 while ( my ( $class, $mapper ) = splice @$base, 0, 2 ) {
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56 _trace("parent $class");
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57 $IMPL::require::level ++;
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58 $class = $aliases->{$class} || _require($class);
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59 $IMPL::require::level --;
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60
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61 push @isa, $class;
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62 $ctor{$class} = $mapper;
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63 }
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64 }
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65 elsif ( ref $base eq 'HASH' ) {
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66 while ( my ( $class, $mapper ) = each %$base ) {
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67 _trace("parent $class");
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68 $IMPL::require::level ++;
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69 $class = $aliases->{$class} || _require($class);
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70 $IMPL::require::level --;
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71
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72 push @isa, $class;
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73 $ctor{$class} = $mapper;
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74 }
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75 }
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76
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77 %{"${caller}::CTOR"} = %ctor;
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78 push @{"${caller}::ISA"}, @isa;
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79
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80 if(ref($args->{meta}) eq 'ARRAY') {
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81 $caller->SetMeta($_) foreach @{$args->{meta}};
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82 }
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83
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84 my $props = $args->{props} || [];
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85
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86 if ( $props eq 'HASH' ) {
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87 $props = [%$props];
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88 }
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89
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90 die "A hash or an array reference is required in the properties list"
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91 unless ref $props eq 'ARRAY';
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92
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93 carp "Odd elements number in properties declaration of $caller"
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94 unless scalar(@$props) % 2 == 0;
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95
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96 if (@$props) {
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97 $self->_implementProps($props,$caller);
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98 }
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99
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100 if ($args->{_implement}) {
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101 $self->_implementProps($caller->abstractProps,$caller);
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102 $caller->abstractProps([]);
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103 }
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104
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105 $IMPL::require::level--;
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106 delete $IMPL::require::PENDING{$caller};
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107 }
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108
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109 sub _implementProps {
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110 my ($self, $props, $caller) = @_;
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111
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112 for ( my $i = 0 ; $i < @$props - 1 ; $i = $i + 2 ) {
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113 my ( $prop, $spec ) = @{$props}[ $i, $i + 1 ];
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114
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115 $caller->ClassPropertyImplementor->Implement(
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116 $spec,
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117 {
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118 name => $prop,
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119 class => $caller,
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120 access => $prop =~ /^_/
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121 ? ACCESS_PRIVATE
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122 : ACCESS_PUBLIC
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123 }
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124 );
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125 }
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126 }
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127
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128 1;
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129
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130 __END__
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131
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132 =pod
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133
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134 =head1 NAME
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135
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136 C<IMPL::declare> - описывает класс
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137
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138 =head1 SYNOPSIS
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139
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140 =begin code
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141
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142 package My::Bar;
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143
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144 use IMPL::declare {
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145 require => {
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146 TFoo => 'My::Foo',
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147 TBox => 'My::Box'
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148 },
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149 base => {
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150 TFoo => '@_',
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151 'IMPL::Object' => undef,
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152 }
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153 }
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154
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155 sub CreateBox {
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156 my ($this) = @_;
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157 return TBox->new($this);
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158 }
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159
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160 =end code
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161
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162 Специальная ситрока C<@_> означает передачу параметров конструктора текущего класса конструктору
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163 базового класса без изменений.
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164
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165 =head1 DESCRIPTION
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166
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167 Описывает текущий пакет(модуль) как класс. В качестве параметра получает ссылку на хеш,
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168 в которой храняться метаданные для объявления класса.
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169
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170 =head1 METADATA
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171
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172 =head2 C<require>
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173
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174 Содержит ссылку на хеш с синонимами модулей, которые будут доступны в текушем модуле,
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175 аналогично использованию C<IMPL::require>. Однако, если модуль не требует загрузки при
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176 помощи C<require> нужно использовать префикс C<'-'> в его имени
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177
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178 =begin code
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179
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180 {
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181 require => {
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182 TObject => 'IMPL::Object', # will be loaded with require
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183 TFoo => '-My:App::Data::Foo' # will not use 'require' to load module
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184 }
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185 }
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186
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187 =end code
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188
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189 =head2 C<base>
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190
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191 Обисывает базове классы для текущего класса. Если данный параметр - ссылка массив, то
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192 этот массив будет превращен в массив C<@ISA>. Если данный параметр - ссылка на хеш, то
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193 его ключи опичавют список базовых классов, а значения - преобразование параметров для
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194 вызова базовых конструкторов.
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195
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196 В качестве имен базовых классов могут быть как полные имена модулей, так и назначенные
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197 ранее псевдонимы. Использование префикса C<'-'> перед B<полным именем модуля> означает,
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198 что модуль не требуется загружать, в случае с псевдонимами, префикс C<'-'> уже был указан
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199 при их объявлении.
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200
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201 =begin code
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202
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203 {
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204 require => {
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205 TFoo => '-My:App::Data::Foo' # will not use 'require' to load module
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206 },
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207 base => {
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208 TFoo => '@_', # pass parameters unchanged
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209 'My::Base::Class' => sub { name => $_[0], data => $_[1] }, # remap parameters
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210 '-My::Extentions' => undef, # do not pass any parameters
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211 }
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212 }
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213
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214 =end code
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215
228
431db7034a88 Для синхронизации
andrei <andrei@nap21.upri>
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216 =cut