annotate Lib/IMPL/Code/Binding.pm @ 235:a4d9126edcbb

code cleaning
author sergey
date Fri, 12 Oct 2012 02:08:51 +0400
parents 6d8092d8ce1b
children
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1 package IMPL::Code::Binding;
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2 use strict;
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3
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4 use IMPL::require {
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5 Exception => 'IMPL::Exception',
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6 ArgumentException => '-IMPL::ArgumentException'
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7 };
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8
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9 sub new {
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10 my ($self,$expr,$vars) = @_;
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11
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12 $vars ||= [];
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13
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14 die ArgumentException->new( vars => 'A reference to an array is required')
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15 unless ref $vars eq 'ARRAY';
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16
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17 m/^\w+$/ or die ArgumentException->new( vars => 'A valid variable name is required', $_ )
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18 foreach @$vars;
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19
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20 my $varnames = join (',', map { "\$$_" } @$vars);
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21
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22 my $code = <<CODE;
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23 sub {
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24 my ($varnames) = \@_;
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25 $text
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26 }
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27 CODE
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28 my $method = eval $code; #$compiler_env->reval($code,'strict');
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29
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30 return $method;
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31 }
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32
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33 1;
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34
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35 __END__
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36
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37 =pod
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38
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39 =head1 NAME
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40
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41 C<IMPL::Code::Binding> - превращает выражения в процедуру.
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42
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43 =head1 SYNOPSIS
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44
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45 =begin code
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46
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47 use IMPL::require {
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48 Binding => 'IMPL::Code::Binding'
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49 }
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50
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51 my $person = DB->SearchPerson({name => 'Peter'})->First;
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52
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53 my $bind = Binding->new(
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54 [qw(obj)] =>
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55 q{ $obj->addresses->[0]->country->code }
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56 );
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57
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58 print $bind->($person);
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59
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60 =end
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61
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62 =head1 DESCRIPTION
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63
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64 Позвоялет преобразовать выражение в функцию, которую можно будет многократно
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65 использовать для получения значения выражения.
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66
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67 Выражение параметризуется произвольным количеством именованных параметров,
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68 которые будут доступны внутри выражения как переменные. При создании связывателя
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69 в конструктор передается выражение связывания, ссылка насписок из параметров.
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71 При создания связывателя будет проверен синтаксис, и если в выражении допущена
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72 ошибка, возникнет исключение.
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73
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74 Данный класс не является безопасным при создании связывателей из ненадежных
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75 источников, поскольку внутри будет выполнен C<eval>.
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76
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77 =head1 MEMBERS
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78
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79 =head2 C<new(\@vars,$expression)>
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80
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81 Возвращает ссылку на процедуру.
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82
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83 =cut