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annotate Lib/IMPL/require.pm @ 308:47a09a8dc23a

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author sergey
date Thu, 18 Apr 2013 20:06:05 +0400
parents 0f59b2de72af
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1 package IMPL::require;
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2 use Scalar::Util qw(set_prototype);
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3 use strict;
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4 #require IMPL::Code::Loader;
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5
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6 use Carp qw(carp);
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7
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8 our %PENDING;
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9 our $LOADER_LOG;
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10
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11 our $level = 0;
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12
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13 sub import {
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14 my ($self, $aliases) = @_;
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15
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16 return unless $aliases;
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17
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18 die "A hash reference is required" unless ref $aliases eq 'HASH';
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19
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20 my $caller = caller;
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21
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22 $PENDING{$caller} = 1;
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23
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24 no strict 'refs';
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25
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26 while( my ($alias, $class) = each %$aliases ) {
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27 _trace("$alias => $class");
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28 $level++;
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29
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30 $class = _require($class);
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31
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32 *{"${caller}::$alias"} = set_prototype(sub {
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33 $class
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34 }, '');
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35
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36 $level--;
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37 }
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38
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39 delete $PENDING{$caller};
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40 }
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41
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42 sub _require {
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43 my ($class) = @_;
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44
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45 if ( not $class =~ s/^-// ) {
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46 ( my $file = $class ) =~ s/::|'/\//g;
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47 _trace("already pending") and return $class
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48 if $PENDING{$class};
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49 $PENDING{$class} = 1;
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50 _trace("loading $file.pm");
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51 $level++;
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52 require "$file.pm";
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53 $level--;
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54 _trace("loaded $file.pm");
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55 delete $PENDING{$class};
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56 }
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57 $class;
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58 }
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59
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60 sub _trace {
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61 my ($message) = @_;
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62
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63 $LOADER_LOG->print("\t" x $level ,"$message\n") if $LOADER_LOG;
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64
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65 return 1;
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66 }
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67
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68 1;
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69
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70 __END__
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71
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72 =pod
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73
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74 =head1 NAME
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75
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76 C<IMPL::require> загружает и назначет псевдонимы модулям.
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77
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78 =head1 SYNOPSIS
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79
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80 =begin code
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81
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82 use IMPL::require {
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83 TFoo => 'My::Nested::Package::Foo',
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84 FS => 'File::Spec'
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85 };
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86
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87 my $obj = My::Nested::Package::Foo->new('foo');
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88 $obj = TFoo->new('foo'); # ditto
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89
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90 FS->catdir('one','two','three');
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91
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92 =end code
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93
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94 =head1 DESCRIPTION
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95
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96 Загружает модули с помощью C<require> и создает константы которые возвращаю полное имя модуля.
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97
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98
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99 =cut