Mercurial > pub > Impl
annotate Lib/IMPL/declare.pm @ 251:9f394b27dccf
require can handle recursive module references
author | sergey |
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date | Fri, 16 Nov 2012 16:44:16 +0400 |
parents | 6d8092d8ce1b |
children | 34a3f8668b58 |
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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); |
209 | 5 use Carp qw(carp); |
228 | 6 use IMPL::Class::PropertyInfo(); |
230 | 7 use IMPL::Const qw(:access); |
251 | 8 use IMPL::require(); |
9 | |
10 BEGIN { | |
11 *_require = *IMPL::require::_require; | |
12 *_trace = *IMPL::require::_trace; | |
13 } | |
197
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14 |
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15 sub import { |
228 | 16 my ( $self, $args ) = @_; |
17 | |
197
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18 return unless $args; |
228 | 19 |
20 die "A hash reference is required" unless ref $args eq 'HASH'; | |
21 | |
22 no strict 'refs'; | |
23 | |
197
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24 my $caller = caller; |
228 | 25 |
197
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26 my $aliases = $args->{require} || {}; |
251 | 27 |
28 _trace("declare $caller"); | |
29 $IMPL::require::level++; | |
228 | 30 |
31 while ( my ( $alias, $class ) = each %$aliases ) { | |
251 | 32 _trace("$alias => $class"); |
33 $IMPL::require::level ++; | |
198 | 34 my $c = _require($class); |
228 | 35 |
36 *{"${caller}::$alias"} = set_prototype( | |
37 sub { | |
38 $c; | |
39 }, | |
40 '' | |
41 ); | |
251 | 42 $IMPL::require::level --; |
228 | 43 } |
44 | |
45 my $base = $args->{base} || {}; | |
46 | |
47 my %ctor; | |
48 my @isa; | |
49 | |
50 if ( ref $base eq 'ARRAY' ) { | |
51 carp "Odd elements number in require" | |
52 unless scalar(@$base) % 2 == 0; | |
53 while ( my ( $class, $mapper ) = splice @$base, 0, 2 ) { | |
251 | 54 _trace("parent $class"); |
55 $IMPL::require::level ++; | |
228 | 56 $class = $aliases->{$class} || _require($class); |
251 | 57 $IMPL::require::level --; |
228 | 58 |
59 push @isa, $class; | |
60 $ctor{$class} = $mapper; | |
61 } | |
62 } | |
63 elsif ( ref $base eq 'HASH' ) { | |
64 while ( my ( $class, $mapper ) = each %$base ) { | |
251 | 65 _trace("parent $class"); |
66 $IMPL::require::level ++; | |
228 | 67 $class = $aliases->{$class} || _require($class); |
251 | 68 $IMPL::require::level --; |
228 | 69 |
70 push @isa, $class; | |
71 $ctor{$class} = $mapper; | |
72 } | |
73 } | |
230 | 74 |
75 *{"${caller}::CTOR"} = \%ctor; | |
76 *{"${caller}::ISA"} = \@isa; | |
228 | 77 |
78 my $props = $args->{props} || []; | |
79 | |
80 if ( $props eq 'HASH' ) { | |
81 $props = [%$props]; | |
82 } | |
83 | |
84 die "A hash or an array reference is required in the properties list" | |
85 unless ref $props eq 'ARRAY'; | |
86 | |
87 carp "Odd elements number in properties declaration of $caller" | |
88 unless scalar(@$props) % 2 == 0; | |
89 | |
90 if (@$props) { | |
91 for ( my $i = 0 ; $i < @$props - 1 ; $i = $i + 2 ) { | |
92 my ( $prop, $spec ) = @{$props}[ $i, $i + 1 ]; | |
93 | |
94 my $propInfo = IMPL::Class::PropertyInfo->new( | |
95 { | |
96 Name => $prop, | |
97 Mutators => $spec, | |
98 Class => $caller, | |
99 Access => $prop =~ /^_/ | |
230 | 100 ? ACCESS_PRIVATE |
101 : ACCESS_PUBLIC | |
228 | 102 } |
103 ); | |
104 $propInfo->Implement(); | |
105 } | |
106 } | |
251 | 107 |
108 $IMPL::require::level--; | |
197
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109 } |
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110 |
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111 1; |
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112 |
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113 __END__ |
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114 |
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115 =pod |
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116 |
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117 =head1 NAME |
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118 |
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119 C<IMPL::declare> - описывает класс |
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120 |
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121 =head1 SYNOPSIS |
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122 |
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123 =begin code |
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124 |
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125 package My::Bar; |
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126 |
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127 use IMPL::declare { |
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128 require => { |
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129 TFoo => 'My::Foo', |
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130 TBox => 'My::Box' |
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131 }, |
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132 base => { |
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133 TFoo => '@_', |
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134 'IMPL::Object' => undef, |
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135 } |
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136 } |
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137 |
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138 sub CreateBox { |
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139 my ($this) = @_; |
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140 return TBox->new($this); |
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141 } |
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142 |
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143 =end code |
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144 |
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145 Специальная ситрока C<@_> означает передачу параметров конструктора текущего класса конструктору |
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146 базового класса без изменений. |
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147 |
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148 =head1 DESCRIPTION |
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149 |
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150 Описывает текущий пакет(модуль) как класс. В качестве параметра получает ссылку на хеш, |
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151 в которой храняться метаданные для объявления класса. |
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152 |
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153 =head1 METADATA |
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154 |
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155 =head2 C<require> |
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156 |
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157 Содержит ссылку на хеш с синонимами модулей, которые будут доступны в текушем модуле, |
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158 аналогично использованию C<IMPL::require>. Однако, если модуль не требует загрузки при |
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159 помощи C<require> нужно использовать префикс C<'-'> в его имени |
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160 |
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161 =begin code |
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162 |
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163 { |
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164 require => { |
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165 TObject => 'IMPL::Object', # will be loaded with require |
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166 TFoo => '-My:App::Data::Foo' # will not use 'require' to load module |
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167 } |
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168 } |
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169 |
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170 =end code |
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171 |
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172 =head2 C<base> |
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173 |
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174 Обисывает базове классы для текущего класса. Если данный параметр - ссылка массив, то |
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175 этот массив будет превращен в массив C<@ISA>. Если данный параметр - ссылка на хеш, то |
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176 его ключи опичавют список базовых классов, а значения - преобразование параметров для |
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177 вызова базовых конструкторов. |
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178 |
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179 В качестве имен базовых классов могут быть как полные имена модулей, так и назначенные |
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180 ранее псевдонимы. Использование префикса C<'-'> перед B<полным именем модуля> означает, |
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181 что модуль не требуется загружать, в случае с псевдонимами, префикс C<'-'> уже был указан |
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182 при их объявлении. |
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183 |
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184 =begin code |
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185 |
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186 { |
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187 require => { |
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188 TFoo => '-My:App::Data::Foo' # will not use 'require' to load module |
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189 }, |
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190 base => { |
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191 TFoo => '@_', # pass parameters unchanged |
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192 'My::Base::Class' => sub { name => $_[0], data => $_[1] }, # remap parameters |
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193 '-My::Extentions' => undef, # do not pass any parameters |
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194 } |
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195 } |
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196 |
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197 =end code |
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198 |
228 | 199 =cut |