annotate Lib/IMPL/template.pm @ 334:71221d79e6b4

removing web resources contracts
author cin
date Thu, 13 Jun 2013 02:24:57 +0400
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1 package IMPL::template;
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2 use strict;
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3 use warnings;
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4
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5 use IMPL::Class::Template();
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6
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7 sub import {
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8 shift;
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9 my %args = @_;
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10
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11 my $class = caller;
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12
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13 my @paramNames = grep m/\w+/, @{$args{parameters} || []};
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14 my $declare = $args{declare};
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15 my @isa = (@{$args{base} || []}, $class);
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16 my %instances;
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17
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18 no strict 'refs';
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19
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20 push @{"${class}::ISA"}, 'IMPL::Class::Template';
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21
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22 *{"${class}::$_"} = sub { die IMPL::InvalidOperationException("A template parameter isn't available here") }
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23 foreach @paramNames;
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24
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25 *{"${class}::spec"} = sub {
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26 my ($self,@params) = @_;
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27
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28 my $specClass = $self->makeName(@params);
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29
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30 return $specClass if $instances{$specClass};
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31
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32 $instances{$specClass} = 1;
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33
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34 for (my $i=0; $i < @paramNames; $i++) {
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35 my $param = $params[$i];
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36 *{"${specClass}::$paramNames[$i]"} = sub { $param };
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37 }
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38
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39 @{"${specClass}::ISA"} = @isa;
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40
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41 &$declare($specClass) if $declare;
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42 return $specClass;
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43 };
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44 }
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45
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46 1;
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47
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48 __END__
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49
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50 =pod
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51
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52 =head1 NAME
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53
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54 C<IMPL::template> директива для объявления шаблона.
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55
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56 =head1 SYNPOSIS
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57
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58 =begin code
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59
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60 package KeyValuePair;
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61
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62 use IMPL::Class::Property;
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63
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64 use IMPL::template (
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65 parameters => [qw(TKey TValue))],
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66 base => [qw(IMPL::Object IMPL::Object::Autofill)],
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67 declare => sub {
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68 my ($class) = @_;
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69 public $class->CreateProperty(key => prop_get | owner_set, { type => $class->TKey } );
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70 public $class->CreateProperty(value => prop_all, { type => $class->TValue} );
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71
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72 $class->PassThroughArgs;
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73 }
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74 );
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75
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76 BEGIN {
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77 public property id => prop_get | owner_set, { type => 'integer'};
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78 }
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79
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80 __PACKAGE__->PassThroughArgs;
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81
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82 package MyCollection;
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83
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84 use IMPL::Class::Property;
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85
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86 use IMPL::lang;
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87 use IMPL::template(
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88 parameters => [qw(TKey TValue)],
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89 base => [qw(IMPL::Object)],
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90 declare => sub {
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91 my ($class) = @_;
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92 my $item_t = spec KeyValuePair($class->TKey,$class->TValue);
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93
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94 public $class->CreateProperty(items => prop_get | prop_list, { type => $item_t } );
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95
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96 $class->static_accessor( ItemType => $item_t );
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97 }
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98 )
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99
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100 sub Add {
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101 my ($this,$key,$value) = @_;
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102
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103 die new IMPL::ArgumentException( key => "Invalid argument type" ) unless is $key, $this->TKey;
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104 die new IMPL::ArgumentException( value => "Invalid argument type" ) unless is $value, $this->TValue;
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105
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106 $this->items->AddLast( $this->ItemType->new( key => $key, value => $value ) );
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107 }
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108
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109 package main;
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110
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111 use IMPL::require {
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112 TFoo => 'Some::Package::Foo',
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113 TBar => 'Some::Package::Bar'
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114 };
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115
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116 my $TCol = spec MyCollection(TFoo, TBar);
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117
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118 =end code
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119
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120 =head1 DESCRIPTION
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121
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122 Шаблоны используются для динамической генерации классов. Процесс создания класса
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123 по шаблону называется специализацией, при этом создается новый класс:
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124
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125 =over
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126
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127 =item 1
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128
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129 Обявляется новый пакет с именем, вычисленным из имени и параметров шаблона
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130
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131 =item 2
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132
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133 Формируется массив C<@ISA> для созаднного класса, в который добавляется имя шаблона
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134
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135 =item 3
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136
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137 Формируются методы с именами параметров шаблона, возвращающие реальные значения параметров
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138
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139 =item 4
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140
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141 Вызывается метод для конструирования специализиции
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142
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143 =back
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145 =head1 MEMBERS
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147 =over
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148
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149 =item C<spec(@params)>
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150
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151 Метод, создающий специализацию шаблона. Может быть вызван как оператор.
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152
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153 =back
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154
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155 =cut