Mercurial > pub > Impl

annotate Lib/IMPL/declare.pm @ 197:6b1dda998839

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Added IMPL::declare, IMPL::require, to simplify module definitions IMPL::Transform now admires object inheritance while searching for the transformation Added HTTP some exceptions IMPL::Web::Application::RestResource almost implemented
author sergey
date Thu, 19 Apr 2012 02:10:02 +0400
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children 2ffe6f661605
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6b1dda998839 Added IMPL::declare, IMPL::require, to simplify module definitions
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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
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6 sub import {
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7 my ($self,$args) = @_;
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8
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9 return unless $args;
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10
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11 die "A hash reference is required" unless ref $args eq 'HASH';
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12
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13 no strict 'refs';
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14
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15 my $caller = caller;
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16
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17 my $aliases = $args->{require} || {};
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18
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19 while( my ($alias, $class) = each %$aliases ) {
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20 _require($class);
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21
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22 *{"${caller}::$alias"} = set_prototype(sub {
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23 $class
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24 }, '');
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25 }
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26
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27 my $base = $args->{base} || {};
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28
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29 my %ctor;
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30 my @isa;
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31
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32 if (ref $base eq 'ARRAY') {
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33 @isa = map _require($_), @$base if @$base;
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34 } elsif (ref $base eq 'HASH' ) {
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35 while ( my ($class,$mapper) = each %$base ) {
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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} = $mapper;
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40 }
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41 }
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42
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43 *{"${caller}::CTOR"} = \%ctor;
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44 *{"${caller}::ISA"} = \@isa;
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45 }
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46
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47 sub _require {
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48 my ($class) = @_;
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49
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50 if (not $class =~ s/^-//) {
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51 (my $file = $class) =~ s/::|'/\//g;
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52 require "$file.pm";
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53 }
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54 $class;
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55 }
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56
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57
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58 1;
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59
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60 __END__
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61
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62 =pod
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63
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64 =head1 NAME
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65
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66 C<IMPL::declare> - описывает класс
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67
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68 =head1 SYNOPSIS
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69
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70 =begin code
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71
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72 package My::Bar;
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73
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74 use IMPL::declare {
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75 require => {
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76 TFoo => 'My::Foo',
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77 TBox => 'My::Box'
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78 },
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79 base => {
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80 TFoo => '@_',
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81 'IMPL::Object' => undef,
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82 }
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83 }
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84
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85 sub CreateBox {
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86 my ($this) = @_;
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87 return TBox->new($this);
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88 }
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89
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90 =end code
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91
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92 Специальная ситрока C<@_> означает передачу параметров конструктора текущего класса конструктору
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93 базового класса без изменений.
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94
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95 =head1 DESCRIPTION
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96
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97 Описывает текущий пакет(модуль) как класс. В качестве параметра получает ссылку на хеш,
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98 в которой храняться метаданные для объявления класса.
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99
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100 =head1 METADATA
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101
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102 =head2 C<require>
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103
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104 Содержит ссылку на хеш с синонимами модулей, которые будут доступны в текушем модуле,
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105 аналогично использованию C<IMPL::require>. Однако, если модуль не требует загрузки при
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106 помощи C<require> нужно использовать префикс C<'-'> в его имени
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107
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108 =begin code
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109
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110 {
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111 require => {
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112 TObject => 'IMPL::Object', # will be loaded with require
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113 TFoo => '-My:App::Data::Foo' # will not use 'require' to load module
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114 }
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115 }
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116
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117 =end code
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118
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119 =head2 C<base>
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120
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121 Обисывает базове классы для текущего класса. Если данный параметр - ссылка массив, то
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122 этот массив будет превращен в массив C<@ISA>. Если данный параметр - ссылка на хеш, то
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123 его ключи опичавют список базовых классов, а значения - преобразование параметров для
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124 вызова базовых конструкторов.
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125
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126 В качестве имен базовых классов могут быть как полные имена модулей, так и назначенные
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127 ранее псевдонимы. Использование префикса C<'-'> перед B<полным именем модуля> означает,
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128 что модуль не требуется загружать, в случае с псевдонимами, префикс C<'-'> уже был указан
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129 при их объявлении.
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130
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131 =begin code
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132
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133 {
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134 require => {
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135 TFoo => '-My:App::Data::Foo' # will not use 'require' to load module
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136 },
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137 base => {
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138 TFoo => '@_', # pass parameters unchanged
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139 'My::Base::Class' => sub { name => $_[0], data => $_[1] }, # remap parameters
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140 '-My::Extentions' => undef, # do not pass any parameters
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141 }
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142 }
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143
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144 =end code
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145
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146 =cut