annotate lib/IMPL/declare.pm @ 417:3ed0c58e9da3 ref20150831

working on di container, tests
author cin
date Mon, 02 Nov 2015 01:56:53 +0300
parents ee36115f6a34
children b0481c071bea
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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 Carp qw(carp);
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5 use IMPL::lang qw( :base );
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6 use IMPL::Class::PropertyInfo();
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7 use IMPL::Const qw(:access);
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8 use IMPL::require();
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9
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10 BEGIN {
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11 *_require = *IMPL::require::_require;
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12 *_trace = *IMPL::require::_trace;
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13 }
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14
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15 sub import {
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16 my ( $self, $args ) = @_;
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17
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18 return unless $args;
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19
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20 die "A hash reference is required" unless ishash($args);
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21
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22 no strict 'refs';
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23 no warnings 'once';
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24
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25 my $caller = caller;
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26
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27 my $aliases = $args->{require} || {};
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28
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29 $IMPL::require::PENDING{$caller} = 1;
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30 _trace("declare $caller");
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31 $IMPL::require::level++;
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32
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33 *{"${caller}::SELF"} = sub () {
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34 $caller;
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35 };
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36
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37 while ( my ( $alias, $class ) = each %$aliases ) {
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38 _trace("$alias => $class");
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39 $IMPL::require::level++;
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40 my $c = _require($class);
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41
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42 *{"${caller}::$alias"} = sub () {
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43 $c;
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44 };
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45 $IMPL::require::level--;
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46 }
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47
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48 my $base = $args->{base} || {};
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49
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50 my %ctor;
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51 my @isa;
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52
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53 if ( isarray($base) ) {
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54 carp "Odd elements number in require"
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55 unless scalar(@$base) % 2 == 0;
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56 while ( my ( $class, $mapper ) = splice @$base, 0, 2 ) {
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57 _trace("parent $class");
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58 $IMPL::require::level++;
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59 $class = $aliases->{$class} || _require($class);
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60 $IMPL::require::level--;
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61
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62 push @isa, $class;
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63 $ctor{$class} = $mapper;
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64 }
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65 }
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66 elsif ( ishash($base) ) {
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67 while ( my ( $class, $mapper ) = each %$base ) {
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68 _trace("parent $class");
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69 $IMPL::require::level++;
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70 $class = $aliases->{$class} || _require($class);
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71 $IMPL::require::level--;
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72
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73 push @isa, $class;
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74 $ctor{$class} = $mapper;
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75 }
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76 }
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77
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78 %{"${caller}::CTOR"} = %ctor;
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79 push @{"${caller}::ISA"}, @isa;
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80
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81 if ( isarray( $args->{meta} ) ) {
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82 $caller->SetMeta($_) foreach @{ $args->{meta} };
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83 }
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84
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85 my $props = $args->{props} || [];
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86
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87 if ( ishash($props) ) {
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88 $props = [%$props];
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89 }
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90
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91 die "A hash or an array reference is required in the properties list"
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92 unless isarray($props);
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93
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94 carp "Odd elements number in properties declaration of $caller"
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95 unless scalar(@$props) % 2 == 0;
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96
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97 if (@$props) {
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98 $self->_implementProps( $props, $caller );
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99 }
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100
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101 if ( $args->{_implement} ) {
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102 $self->_implementProps( $caller->abstractProps, $caller );
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103 $caller->abstractProps( [] );
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104 }
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105
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106 $IMPL::require::level--;
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107 delete $IMPL::require::PENDING{$caller};
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108 }
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109
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110 sub _implementProps {
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111 my ( $self, $props, $caller ) = @_;
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112
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113 for ( my $i = 0 ; $i < @$props - 1 ; $i = $i + 2 ) {
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114 my ( $prop, $spec ) = @{$props}[ $i, $i + 1 ];
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115
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116 $caller->ClassPropertyImplementor->Implement(
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117 $spec,
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118 {
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119 name => $prop,
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120 class => $caller,
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121 access => $prop =~ /^_/
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122 ? ACCESS_PRIVATE
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123 : ACCESS_PUBLIC
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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
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129 1;
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130
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131 __END__
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132
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133 =pod
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134
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135 =head1 NAME
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136
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137 C<IMPL::declare> - описывает класс
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138
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139 =head1 SYNOPSIS
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140
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141 =begin code
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142
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143 package My::Bar;
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144
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145 use IMPL::declare {
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146 require => {
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147 TFoo => 'My::Foo',
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148 TBox => 'My::Box'
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149 },
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150 base => {
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151 TFoo => '@_',
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152 'IMPL::Object' => undef,
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153 }
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154 }
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155
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156 sub CreateBox {
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157 my ($this) = @_;
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158 return TBox->new($this);
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159 }
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160
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161 =end code
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162
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163 Специальная ситрока C<@_> означает передачу параметров конструктора текущего класса конструктору
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164 базового класса без изменений.
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165
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166 =head1 DESCRIPTION
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167
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168 Описывает текущий пакет(модуль) как класс. В качестве параметра получает ссылку на хеш,
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169 в которой храняться метаданные для объявления класса.
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170
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171 =head1 METADATA
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172
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173 =head2 C<require>
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174
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175 Содержит ссылку на хеш с синонимами модулей, которые будут доступны в текушем модуле,
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176 аналогично использованию C<IMPL::require>. Однако, если модуль не требует загрузки при
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177 помощи C<require> нужно использовать префикс C<'-'> в его имени
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178
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179 =begin code
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180
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181 {
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182 require => {
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183 TObject => 'IMPL::Object', # will be loaded with require
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184 TFoo => '-My:App::Data::Foo' # will not use 'require' to load module
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185 }
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186 }
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187
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188 =end code
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189
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190 =head2 C<base>
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191
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192 Обисывает базове классы для текущего класса. Если данный параметр - ссылка массив, то
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193 этот массив будет превращен в массив C<@ISA>. Если данный параметр - ссылка на хеш, то
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194 его ключи опичавют список базовых классов, а значения - преобразование параметров для
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195 вызова базовых конструкторов.
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196
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197 В качестве имен базовых классов могут быть как полные имена модулей, так и назначенные
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198 ранее псевдонимы. Использование префикса C<'-'> перед B<полным именем модуля> означает,
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199 что модуль не требуется загружать, в случае с псевдонимами, префикс C<'-'> уже был указан
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200 при их объявлении.
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201
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202 =begin code
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203
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204 {
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205 require => {
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206 TFoo => '-My:App::Data::Foo' # will not use 'require' to load module
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207 },
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208 base => {
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209 TFoo => '@_', # pass parameters unchanged
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210 'My::Base::Class' => sub { name => $_[0], data => $_[1] }, # remap parameters
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211 '-My::Extentions' => undef, # do not pass any parameters
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212 }
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213 }
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214
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215 =end code
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216
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217 =cut