Mercurial > pub > Impl
annotate Lib/IMPL/declare.pm @ 394:2c14f66efa08
minor changes
author | cin |
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date | Tue, 18 Feb 2014 18:17:20 +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); |
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 } | |
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14 |
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15 sub import { |
228 | 16 my ( $self, $args ) = @_; |
17 | |
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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'; | |
280 | 23 no warnings 'once'; |
228 | 24 |
197
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25 my $caller = caller; |
228 | 26 |
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27 my $aliases = $args->{require} || {}; |
251 | 28 |
252 | 29 $IMPL::require::PENDING{$caller} = 1; |
251 | 30 _trace("declare $caller"); |
31 $IMPL::require::level++; | |
228 | 32 |
33 while ( my ( $alias, $class ) = each %$aliases ) { | |
251 | 34 _trace("$alias => $class"); |
35 $IMPL::require::level ++; | |
198 | 36 my $c = _require($class); |
228 | 37 |
38 *{"${caller}::$alias"} = set_prototype( | |
39 sub { | |
40 $c; | |
41 }, | |
42 '' | |
43 ); | |
251 | 44 $IMPL::require::level --; |
228 | 45 } |
46 | |
47 my $base = $args->{base} || {}; | |
48 | |
49 my %ctor; | |
50 my @isa; | |
51 | |
52 if ( ref $base eq 'ARRAY' ) { | |
53 carp "Odd elements number in require" | |
54 unless scalar(@$base) % 2 == 0; | |
55 while ( my ( $class, $mapper ) = splice @$base, 0, 2 ) { | |
251 | 56 _trace("parent $class"); |
57 $IMPL::require::level ++; | |
228 | 58 $class = $aliases->{$class} || _require($class); |
251 | 59 $IMPL::require::level --; |
228 | 60 |
61 push @isa, $class; | |
62 $ctor{$class} = $mapper; | |
63 } | |
64 } | |
65 elsif ( ref $base eq 'HASH' ) { | |
66 while ( my ( $class, $mapper ) = each %$base ) { | |
251 | 67 _trace("parent $class"); |
68 $IMPL::require::level ++; | |
228 | 69 $class = $aliases->{$class} || _require($class); |
251 | 70 $IMPL::require::level --; |
228 | 71 |
72 push @isa, $class; | |
73 $ctor{$class} = $mapper; | |
74 } | |
75 } | |
230 | 76 |
279 | 77 %{"${caller}::CTOR"} = %ctor; |
78 push @{"${caller}::ISA"}, @isa; | |
79 | |
80 if(ref($args->{meta}) eq 'ARRAY') { | |
81 $caller->SetMeta($_) foreach @{$args->{meta}}; | |
82 } | |
228 | 83 |
84 my $props = $args->{props} || []; | |
85 | |
86 if ( $props eq 'HASH' ) { | |
87 $props = [%$props]; | |
88 } | |
89 | |
90 die "A hash or an array reference is required in the properties list" | |
91 unless ref $props eq 'ARRAY'; | |
92 | |
93 carp "Odd elements number in properties declaration of $caller" | |
94 unless scalar(@$props) % 2 == 0; | |
95 | |
96 if (@$props) { | |
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97 $self->_implementProps($props,$caller); |
228 | 98 } |
251 | 99 |
256
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100 if ($args->{_implement}) { |
281 | 101 $self->_implementProps($caller->abstractProps,$caller); |
102 $caller->abstractProps([]); | |
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103 } |
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104 |
251 | 105 $IMPL::require::level--; |
252 | 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 ]; |
278 | 114 |
115 $caller->ClassPropertyImplementor->Implement( | |
116 $spec, | |
256
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117 { |
275 | 118 name => $prop, |
119 class => $caller, | |
120 access => $prop =~ /^_/ | |
256
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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 | 216 =cut |