Mercurial > pub > Impl

annotate Lib/IMPL/declare.pm @ 227:70ad6bc20908

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author sergey
date Fri, 07 Sep 2012 16:32:17 +0400
parents 2b9b55cfb79b
children 431db7034a88
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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 $base eq 'ARRAY') {
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34 carp "Odd elements number in require" unless scalar(@$base)%2 == 0;
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35 while ( my ($class,$mapper) = splice @$base, 0, 2 ) {
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36 $class = $aliases->{$class} || _require($class);
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37
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38 push @isa,$class;
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39 $ctor{$class} = $mapper;
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40 }
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41 } elsif (ref $base eq 'HASH' ) {
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42 while ( my ($class,$mapper) = each %$base ) {
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43 $class = $aliases->{$class} || _require($class);
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44
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45 push @isa,$class;
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46 $ctor{$class} = $mapper;
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47 }
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48 }
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49
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50 *{"${caller}::CTOR"} = \%ctor;
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51 *{"${caller}::ISA"} = \@isa;
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52 }
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53
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54 sub _require {
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55 my ($class) = @_;
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56
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57 if (not $class =~ s/^-//) {
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58 (my $file = $class) =~ s/::|'/\//g;
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59 require "$file.pm";
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60 }
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61 $class;
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62 }
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63
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64
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65 1;
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66
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67 __END__
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68
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69 =pod
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70
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71 =head1 NAME
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72
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73 C<IMPL::declare> - описывает класс
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74
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75 =head1 SYNOPSIS
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76
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77 =begin code
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78
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79 package My::Bar;
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80
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81 use IMPL::declare {
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82 require => {
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83 TFoo => 'My::Foo',
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84 TBox => 'My::Box'
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85 },
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86 base => {
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87 TFoo => '@_',
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88 'IMPL::Object' => undef,
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89 }
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90 }
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91
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92 sub CreateBox {
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93 my ($this) = @_;
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94 return TBox->new($this);
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95 }
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96
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97 =end code
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98
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99 Специальная ситрока C<@_> означает передачу параметров конструктора текущего класса конструктору
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100 базового класса без изменений.
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101
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102 =head1 DESCRIPTION
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103
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104 Описывает текущий пакет(модуль) как класс. В качестве параметра получает ссылку на хеш,
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105 в которой храняться метаданные для объявления класса.
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106
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107 =head1 METADATA
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108
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109 =head2 C<require>
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110
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111 Содержит ссылку на хеш с синонимами модулей, которые будут доступны в текушем модуле,
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112 аналогично использованию C<IMPL::require>. Однако, если модуль не требует загрузки при
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113 помощи C<require> нужно использовать префикс C<'-'> в его имени
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114
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115 =begin code
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116
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117 {
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118 require => {
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119 TObject => 'IMPL::Object', # will be loaded with require
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120 TFoo => '-My:App::Data::Foo' # will not use 'require' to load module
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121 }
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122 }
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123
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124 =end code
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125
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126 =head2 C<base>
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127
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128 Обисывает базове классы для текущего класса. Если данный параметр - ссылка массив, то
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129 этот массив будет превращен в массив C<@ISA>. Если данный параметр - ссылка на хеш, то
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130 его ключи опичавют список базовых классов, а значения - преобразование параметров для
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131 вызова базовых конструкторов.
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132
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133 В качестве имен базовых классов могут быть как полные имена модулей, так и назначенные
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134 ранее псевдонимы. Использование префикса C<'-'> перед B<полным именем модуля> означает,
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135 что модуль не требуется загружать, в случае с псевдонимами, префикс C<'-'> уже был указан
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136 при их объявлении.
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137
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138 =begin code
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139
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140 {
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141 require => {
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142 TFoo => '-My:App::Data::Foo' # will not use 'require' to load module
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143 },
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144 base => {
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145 TFoo => '@_', # pass parameters unchanged
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146 'My::Base::Class' => sub { name => $_[0], data => $_[1] }, # remap parameters
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147 '-My::Extentions' => undef, # do not pass any parameters
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148 }
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149 }
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150
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151 =end code
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152
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153 =cut