Mercurial > pub > Impl
annotate Lib/IMPL/declare.pm @ 233:3cebcf6fdb9b
refactoring, cleaning code
author | sergey |
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date | Thu, 11 Oct 2012 04:53:08 +0400 |
parents | 6d8092d8ce1b |
children | 9f394b27dccf |
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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); |
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8 |
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9 sub import { |
228 | 10 my ( $self, $args ) = @_; |
11 | |
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12 return unless $args; |
228 | 13 |
14 die "A hash reference is required" unless ref $args eq 'HASH'; | |
15 | |
16 no strict 'refs'; | |
17 | |
197
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18 my $caller = caller; |
228 | 19 |
197
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20 my $aliases = $args->{require} || {}; |
228 | 21 |
22 while ( my ( $alias, $class ) = each %$aliases ) { | |
198 | 23 my $c = _require($class); |
228 | 24 |
25 *{"${caller}::$alias"} = set_prototype( | |
26 sub { | |
27 $c; | |
28 }, | |
29 '' | |
30 ); | |
31 } | |
32 | |
33 my $base = $args->{base} || {}; | |
34 | |
35 my %ctor; | |
36 my @isa; | |
37 | |
38 if ( ref $base eq 'ARRAY' ) { | |
39 carp "Odd elements number in require" | |
40 unless scalar(@$base) % 2 == 0; | |
41 while ( my ( $class, $mapper ) = splice @$base, 0, 2 ) { | |
42 $class = $aliases->{$class} || _require($class); | |
43 | |
44 push @isa, $class; | |
45 $ctor{$class} = $mapper; | |
46 } | |
47 } | |
48 elsif ( ref $base eq 'HASH' ) { | |
49 while ( my ( $class, $mapper ) = each %$base ) { | |
50 $class = $aliases->{$class} || _require($class); | |
51 | |
52 push @isa, $class; | |
53 $ctor{$class} = $mapper; | |
54 } | |
55 } | |
230 | 56 |
57 *{"${caller}::CTOR"} = \%ctor; | |
58 *{"${caller}::ISA"} = \@isa; | |
228 | 59 |
60 my $props = $args->{props} || []; | |
61 | |
62 if ( $props eq 'HASH' ) { | |
63 $props = [%$props]; | |
64 } | |
65 | |
66 die "A hash or an array reference is required in the properties list" | |
67 unless ref $props eq 'ARRAY'; | |
68 | |
69 carp "Odd elements number in properties declaration of $caller" | |
70 unless scalar(@$props) % 2 == 0; | |
71 | |
72 if (@$props) { | |
73 for ( my $i = 0 ; $i < @$props - 1 ; $i = $i + 2 ) { | |
74 my ( $prop, $spec ) = @{$props}[ $i, $i + 1 ]; | |
75 | |
76 my $propInfo = IMPL::Class::PropertyInfo->new( | |
77 { | |
78 Name => $prop, | |
79 Mutators => $spec, | |
80 Class => $caller, | |
81 Access => $prop =~ /^_/ | |
230 | 82 ? ACCESS_PRIVATE |
83 : ACCESS_PUBLIC | |
228 | 84 } |
85 ); | |
86 $propInfo->Implement(); | |
87 } | |
88 } | |
197
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89 } |
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90 |
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91 sub _require { |
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92 my ($class) = @_; |
228 | 93 |
94 if ( not $class =~ s/^-// ) { | |
95 ( my $file = $class ) =~ s/::|'/\//g; | |
197
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96 require "$file.pm"; |
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97 } |
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98 $class; |
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99 } |
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100 |
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101 1; |
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102 |
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103 __END__ |
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104 |
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105 =pod |
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106 |
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107 =head1 NAME |
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108 |
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109 C<IMPL::declare> - описывает класс |
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110 |
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111 =head1 SYNOPSIS |
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112 |
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113 =begin code |
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114 |
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115 package My::Bar; |
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116 |
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117 use IMPL::declare { |
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118 require => { |
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119 TFoo => 'My::Foo', |
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120 TBox => 'My::Box' |
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121 }, |
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122 base => { |
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123 TFoo => '@_', |
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124 'IMPL::Object' => undef, |
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125 } |
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126 } |
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127 |
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128 sub CreateBox { |
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129 my ($this) = @_; |
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130 return TBox->new($this); |
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131 } |
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132 |
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133 =end code |
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134 |
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135 Специальная ситрока C<@_> означает передачу параметров конструктора текущего класса конструктору |
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136 базового класса без изменений. |
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137 |
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138 =head1 DESCRIPTION |
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139 |
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140 Описывает текущий пакет(модуль) как класс. В качестве параметра получает ссылку на хеш, |
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141 в которой храняться метаданные для объявления класса. |
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142 |
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143 =head1 METADATA |
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144 |
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145 =head2 C<require> |
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146 |
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147 Содержит ссылку на хеш с синонимами модулей, которые будут доступны в текушем модуле, |
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148 аналогично использованию C<IMPL::require>. Однако, если модуль не требует загрузки при |
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149 помощи C<require> нужно использовать префикс C<'-'> в его имени |
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150 |
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151 =begin code |
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152 |
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153 { |
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154 require => { |
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155 TObject => 'IMPL::Object', # will be loaded with require |
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156 TFoo => '-My:App::Data::Foo' # will not use 'require' to load module |
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157 } |
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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 =head2 C<base> |
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163 |
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164 Обисывает базове классы для текущего класса. Если данный параметр - ссылка массив, то |
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165 этот массив будет превращен в массив C<@ISA>. Если данный параметр - ссылка на хеш, то |
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166 его ключи опичавют список базовых классов, а значения - преобразование параметров для |
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167 вызова базовых конструкторов. |
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168 |
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169 В качестве имен базовых классов могут быть как полные имена модулей, так и назначенные |
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170 ранее псевдонимы. Использование префикса C<'-'> перед B<полным именем модуля> означает, |
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171 что модуль не требуется загружать, в случае с псевдонимами, префикс C<'-'> уже был указан |
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172 при их объявлении. |
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173 |
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174 =begin code |
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175 |
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176 { |
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177 require => { |
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178 TFoo => '-My:App::Data::Foo' # will not use 'require' to load module |
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179 }, |
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180 base => { |
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181 TFoo => '@_', # pass parameters unchanged |
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182 'My::Base::Class' => sub { name => $_[0], data => $_[1] }, # remap parameters |
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183 '-My::Extentions' => undef, # do not pass any parameters |
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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 |
228 | 189 =cut |