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annotate Lib/IMPL/declare.pm @ 209:a8db61d0ed33

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IMPL::Class::Meta refactoring
author cin
date Mon, 28 May 2012 19:58:56 +0400
parents 2ffe6f661605
children 2b9b55cfb79b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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
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7 sub import {
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8 my ($self,$args) = @_;
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9
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10 return unless $args;
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11
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12 die "A hash reference is required" unless ref $args eq 'HASH';
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13
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14 no strict 'refs';
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15
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16 my $caller = caller;
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17
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18 my $aliases = $args->{require} || {};
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19
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20 while( my ($alias, $class) = each %$aliases ) {
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21 my $c = _require($class);
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22
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23 *{"${caller}::$alias"} = set_prototype(sub {
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24 $c
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25 }, '');
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26 }
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27
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28 my $base = $args->{base} || {};
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29
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30 my %ctor;
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31 my @isa;
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32
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33 if (ref $base eq 'ARRAY') {
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34 carp("will be changed in next version");
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35 @isa = map _require($_), @$base if @$base;
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36 } elsif (ref $base eq 'HASH' ) {
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37 while ( my ($class,$mapper) = each %$base ) {
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38 $class = $aliases->{$class} || _require($class);
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39
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40 push @isa,$class;
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41 $ctor{$class} = $mapper;
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42 }
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43 }
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44
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45 *{"${caller}::CTOR"} = \%ctor;
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46 *{"${caller}::ISA"} = \@isa;
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47 }
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48
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49 sub _require {
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50 my ($class) = @_;
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51
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52 if (not $class =~ s/^-//) {
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53 (my $file = $class) =~ s/::|'/\//g;
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54 require "$file.pm";
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55 }
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56 $class;
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57 }
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58
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59
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60 1;
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61
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62 __END__
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63
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64 =pod
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65
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66 =head1 NAME
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67
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68 C<IMPL::declare> - описывает класс
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69
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70 =head1 SYNOPSIS
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71
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72 =begin code
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73
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74 package My::Bar;
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75
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76 use IMPL::declare {
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77 require => {
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78 TFoo => 'My::Foo',
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79 TBox => 'My::Box'
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80 },
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81 base => {
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82 TFoo => '@_',
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83 'IMPL::Object' => undef,
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84 }
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85 }
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86
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87 sub CreateBox {
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88 my ($this) = @_;
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89 return TBox->new($this);
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90 }
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91
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92 =end code
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93
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94 Специальная ситрока C<@_> означает передачу параметров конструктора текущего класса конструктору
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95 базового класса без изменений.
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96
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97 =head1 DESCRIPTION
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98
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99 Описывает текущий пакет(модуль) как класс. В качестве параметра получает ссылку на хеш,
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100 в которой храняться метаданные для объявления класса.
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101
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102 =head1 METADATA
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103
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104 =head2 C<require>
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105
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106 Содержит ссылку на хеш с синонимами модулей, которые будут доступны в текушем модуле,
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107 аналогично использованию C<IMPL::require>. Однако, если модуль не требует загрузки при
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108 помощи C<require> нужно использовать префикс C<'-'> в его имени
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109
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110 =begin code
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111
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112 {
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113 require => {
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114 TObject => 'IMPL::Object', # will be loaded with require
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115 TFoo => '-My:App::Data::Foo' # will not use 'require' to load module
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116 }
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117 }
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118
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119 =end code
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120
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121 =head2 C<base>
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122
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123 Обисывает базове классы для текущего класса. Если данный параметр - ссылка массив, то
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124 этот массив будет превращен в массив C<@ISA>. Если данный параметр - ссылка на хеш, то
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125 его ключи опичавют список базовых классов, а значения - преобразование параметров для
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126 вызова базовых конструкторов.
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127
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128 В качестве имен базовых классов могут быть как полные имена модулей, так и назначенные
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129 ранее псевдонимы. Использование префикса C<'-'> перед B<полным именем модуля> означает,
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130 что модуль не требуется загружать, в случае с псевдонимами, префикс C<'-'> уже был указан
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131 при их объявлении.
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132
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133 =begin code
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134
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135 {
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136 require => {
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137 TFoo => '-My:App::Data::Foo' # will not use 'require' to load module
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138 },
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139 base => {
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140 TFoo => '@_', # pass parameters unchanged
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141 'My::Base::Class' => sub { name => $_[0], data => $_[1] }, # remap parameters
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142 '-My::Extentions' => undef, # do not pass any parameters
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143 }
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144 }
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145
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146 =end code
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147
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148 =cut