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package Earth; |
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1919
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use 5.018; |
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use strict; |
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use warnings; |
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use Exporter 'import'; |
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195
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our @EXPORT = qw( |
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call |
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can |
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chain |
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false |
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make |
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roll |
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then |
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true |
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wrap |
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); |
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require Scalar::Util; |
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# STASH |
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state $cached = {}; |
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# VERSION |
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our $VERSION = '0.02'; |
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# AUTHORITY |
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34
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our $AUTHORITY = 'cpan:AWNCORP'; |
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36
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# FUNCTIONS |
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38
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sub call { |
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21
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1
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1896
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my ($invocant, $routine, @arguments) = @_; |
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21
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50
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142
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if (UNIVERSAL::isa($invocant, 'CODE')) { |
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0
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0
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return $invocant->(@arguments); |
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} |
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21
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35
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return if !$routine; |
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21
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100
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41
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if (Scalar::Util::blessed($invocant)) { |
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8
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60
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return $invocant->$routine(@arguments); |
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} |
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13
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100
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23
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if (ref($invocant) eq 'SCALAR') { |
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3
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10
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return $$invocant->$routine(@arguments); |
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} |
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10
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16
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my $package = load($invocant); |
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55
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if (my $routine = $package->can($routine)) { |
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80
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return $routine->(@arguments); |
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} |
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0
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0
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0
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if ($package->can('AUTOLOAD')) { |
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1
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1
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6
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no strict 'refs'; |
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1
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1
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1
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398
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56
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return &{"${package}::${routine}"}(@arguments); |
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57
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} |
58
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0
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0
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die("call(@{[join(', ', map qq('$_'), @_)]}) failed"); |
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0
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0
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59
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} |
60
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61
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sub can { |
62
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1
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50
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1
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1
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16
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return if !@_; |
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1
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50
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53
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return call((ref($_[0]) ? $_[0] : \$_[0]), 'can', $_[1]); |
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} |
65
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66
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67
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sub chain { |
68
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3
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3
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1
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38
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my ($invocant, @routines) = @_; |
69
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3
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50
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6
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return if !$invocant; |
70
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3
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100
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16
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for my $next (map +(ref($_) eq 'ARRAY' ? $_ : [$_]), @routines) { |
71
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7
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30
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$invocant = call($invocant, @$next); |
72
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} |
73
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3
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27
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return $invocant; |
74
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} |
75
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76
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sub false { |
77
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2
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2
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1
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3815
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require Scalar::Util; |
78
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2
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19
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state $false = Scalar::Util::dualvar(0, "0"); |
79
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} |
80
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81
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sub load { |
82
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10
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10
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0
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15
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my ($package) = @_; |
83
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84
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10
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100
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29
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if ($$cached{$package}) { |
85
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8
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127
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return $package; |
86
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} |
87
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88
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2
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50
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3
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if ($package eq 'main') { |
89
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0
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0
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return do {$$cached{$package} = 1; $package}; |
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0
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0
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0
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0
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90
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} |
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92
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2
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33
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22
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my $failed = !$package || $package !~ /^\w(?:[\w:']*\w)?$/; |
93
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2
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3
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my $loaded; |
94
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95
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2
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50
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4
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my $error = do { |
96
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2
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2
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local $@; |
97
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1
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1
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7
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no strict 'refs'; |
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1
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1
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1
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237
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98
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2
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13
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$loaded = !!$package->can('new'); |
99
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2
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50
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9
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$loaded = !!$package->can('import') if !$loaded; |
100
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2
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50
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123
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$loaded = eval "require $package; 1" if !$loaded; |
101
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2
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7
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$@; |
102
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} |
103
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if !$failed; |
104
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105
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2
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0
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33
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12
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die join " ", "Error attempting to load", |
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50
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33
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106
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($error ? ("$package: $error") : ($package)) |
107
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if $error |
108
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or $failed |
109
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or not $loaded; |
110
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111
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2
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5
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$$cached{$package} = 1; |
112
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113
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2
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2
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return $package; |
114
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} |
115
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116
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sub make { |
117
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6
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50
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6
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1
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13
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return if !@_; |
118
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6
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13
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return call($_[0], 'new', @_); |
119
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} |
120
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121
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sub roll { |
122
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2
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2
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1
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34
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return (@_[1,0,2..$#_]); |
123
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} |
124
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125
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sub then { |
126
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1
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1
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1
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3
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return ($_[0], call(@_)); |
127
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} |
128
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129
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sub true { |
130
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2
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2
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1
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3900
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require Scalar::Util; |
131
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2
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18
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state $true = Scalar::Util::dualvar(1, "1"); |
132
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} |
133
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134
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sub wrap { |
135
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7
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7
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1
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11437
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my ($package, $alias) = @_; |
136
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7
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50
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18
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return if !$package; |
137
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7
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66
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28
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my $moniker = $alias // $package =~ s/\W//gr; |
138
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7
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14
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my $caller = caller(0); |
139
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1
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1
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6
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no strict 'refs'; |
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1
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1
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1
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67
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140
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1
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1
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6
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no warnings 'redefine'; |
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1
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2
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1
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171
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141
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7
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100
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17
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32
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return *{"${caller}::${moniker}"} = sub { @_ ? make($package, @_) : $package }; |
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7
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93
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17
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19795
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142
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} |
143
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144
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1; |
145
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146
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147
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=head1 NAME |
148
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149
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Earth - FP Framework |
150
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151
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=cut |
152
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153
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=head1 ABSTRACT |
154
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155
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FP Framework for Perl 5 |
156
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157
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=cut |
158
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159
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=head1 VERSION |
160
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161
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0.02 |
162
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163
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=cut |
164
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165
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=head1 SYNOPSIS |
166
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167
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package main; |
168
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169
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use Earth; |
170
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171
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wrap 'Digest::SHA', 'SHA'; |
172
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173
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call(SHA(), 'sha1_hex'); |
174
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175
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# "da39a3ee5e6b4b0d3255bfef95601890afd80709" |
176
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177
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=cut |
178
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179
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=head1 DESCRIPTION |
180
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181
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Earth is a functional-programming framework for Perl 5. Perl is a |
182
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multi-paradigm programming language that also supports functional programming, |
183
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but, Perl has an intentionally limited standard library with an emphasis on |
184
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providing library support via the CPAN which is overwhelmingly object-oriented. |
185
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This makes developing in a functional style difficult as you'll eventually need |
186
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to rely on a CPAN library that requires you to switch over to object-oriented |
187
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programming. Earth facilitates functional programming for Perl 5 by providing |
188
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functions which enable indirect routine dispatching, allowing the execution of |
189
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both functional and object-oriented code. |
190
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191
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=cut |
192
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193
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=head1 FUNCTIONS |
194
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195
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This package provides the following functions: |
196
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197
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=cut |
198
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199
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=head2 call |
200
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201
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call(Str | Object | CodeRef $self, Any @args) (Any) |
202
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203
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The call function dispatches function and method calls to a package and returns |
204
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the result. |
205
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206
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I> |
207
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208
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=over 4 |
209
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210
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=item call example 1 |
211
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212
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# given: synopsis |
213
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214
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call(SHA, 'sha1_hex'); |
215
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216
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# "da39a3ee5e6b4b0d3255bfef95601890afd80709" |
217
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218
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=back |
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=over 4 |
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=item call example 2 |
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# given: synopsis |
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call('Digest::SHA', 'sha1_hex'); |
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# "da39a3ee5e6b4b0d3255bfef95601890afd80709" |
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=back |
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=over 4 |
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=item call example 3 |
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# given: synopsis |
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call(\SHA, 'new'); |
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# bless(do{\(my $o = '...')}, 'Digest::SHA') |
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=back |
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=over 4 |
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=item call example 4 |
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# given: synopsis |
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wrap 'Digest'; |
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call(Digest('SHA'), 'reset'); |
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# "da39a3ee5e6b4b0d3255bfef95601890afd80709" |
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=back |
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=cut |
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260
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=head2 can |
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can(Str | Object | CodeRef $self, Str $name) (CodeRef) |
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264
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The can function checks if the object or class has a routine matching the name |
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provided, and if so returns a coderef for that routine. |
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I> |
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269
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=over 4 |
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=item can example 1 |
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273
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# given: synopsis |
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275
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my $coderef = can(SHA(1), 'sha1_hex'); |
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277
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# sub { ... } |
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279
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=back |
280
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281
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=cut |
282
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283
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=head2 chain |
284
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285
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chain(Str | Object | CodeRef $self, Str | ArrayRef[Str] @args) (Any) |
286
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287
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The chain function chains function and method calls to a package (and return |
288
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values) and returns the result. |
289
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290
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I> |
291
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292
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=over 4 |
293
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294
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=item chain example 1 |
295
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296
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# given: synopsis |
297
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298
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my $hex = chain(\SHA, 'new', 'sha1_hex'); |
299
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300
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# "d3aed913fdc7f277dddcbde47d50a8b5259cb4bc" |
301
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302
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=back |
303
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304
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=over 4 |
305
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306
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=item chain example 2 |
307
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308
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# given: synopsis |
309
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310
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my $hex = chain(\SHA, 'new', ['add', 'hello'], 'sha1_hex'); |
311
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312
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# "f47b0cd4b6336d07ab117d7ee3f47566c9799f23" |
313
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314
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=back |
315
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316
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=over 4 |
317
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318
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=item chain example 3 |
319
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320
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# given: synopsis |
321
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322
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wrap 'Digest'; |
323
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324
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|
my $hex = chain(Digest('SHA'), ['add', 'hello'], 'sha1_hex'); |
325
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326
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# "8575ce82b266fdb5bc98eb43488c3b420577c24c" |
327
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328
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=back |
329
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330
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=cut |
331
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332
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|
=head2 false |
333
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334
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false() (Bool) |
335
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336
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The false function returns a falsy boolean value which is designed to be |
337
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|
practically indistinguishable from the conventional numerical C<0> value. |
338
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339
|
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I> |
340
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341
|
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|
=over 4 |
342
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343
|
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|
=item false example 1 |
344
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345
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package main; |
346
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347
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|
use Earth; |
348
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349
|
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|
my $false = false; |
350
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351
|
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# 0 |
352
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353
|
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=back |
354
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355
|
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=over 4 |
356
|
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357
|
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|
=item false example 2 |
358
|
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359
|
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|
package main; |
360
|
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361
|
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|
use Earth; |
362
|
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363
|
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|
my $true = !false; |
364
|
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365
|
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|
# 1 |
366
|
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367
|
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=back |
368
|
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369
|
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=cut |
370
|
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371
|
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|
=head2 make |
372
|
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373
|
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|
make(Str $package, Any @args) (Any) |
374
|
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|
375
|
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|
|
The make function L<"calls"|Earth/call> the C routine on the invocant and |
376
|
|
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|
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|
|
returns the result which should be a package string or an object. |
377
|
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378
|
|
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I> |
379
|
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380
|
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|
=over 4 |
381
|
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382
|
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|
|
=item make example 1 |
383
|
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|
384
|
|
|
|
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|
|
# given: synopsis |
385
|
|
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|
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|
|
|
386
|
|
|
|
|
|
|
my $string = make(SHA); |
387
|
|
|
|
|
|
|
|
388
|
|
|
|
|
|
|
# bless(do{\(my $o = '...')}, 'Digest::SHA') |
389
|
|
|
|
|
|
|
|
390
|
|
|
|
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|
|
=back |
391
|
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392
|
|
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|
|
=over 4 |
393
|
|
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394
|
|
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|
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|
|
=item make example 2 |
395
|
|
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|
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|
|
396
|
|
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|
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|
|
# given: synopsis |
397
|
|
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|
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|
|
|
398
|
|
|
|
|
|
|
my $string = make(Digest, 'SHA'); |
399
|
|
|
|
|
|
|
|
400
|
|
|
|
|
|
|
# bless(do{\(my $o = '...')}, 'Digest::SHA') |
401
|
|
|
|
|
|
|
|
402
|
|
|
|
|
|
|
=back |
403
|
|
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|
404
|
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|
|
=cut |
405
|
|
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|
|
406
|
|
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|
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|
|
=head2 roll |
407
|
|
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|
|
|
|
|
408
|
|
|
|
|
|
|
roll(Str $name, Any @args) (Any) |
409
|
|
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|
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|
|
|
410
|
|
|
|
|
|
|
The roll function takes a list of arguments, assuming the first argument is |
411
|
|
|
|
|
|
|
invokable, and reorders the list such that the routine name provided comes |
412
|
|
|
|
|
|
|
after the invocant (i.e. the 1st argument), creating a list acceptable to the |
413
|
|
|
|
|
|
|
L function. |
414
|
|
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|
|
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|
|
415
|
|
|
|
|
|
|
I> |
416
|
|
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|
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|
|
417
|
|
|
|
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|
|
=over 4 |
418
|
|
|
|
|
|
|
|
419
|
|
|
|
|
|
|
=item roll example 1 |
420
|
|
|
|
|
|
|
|
421
|
|
|
|
|
|
|
package main; |
422
|
|
|
|
|
|
|
|
423
|
|
|
|
|
|
|
use Earth; |
424
|
|
|
|
|
|
|
|
425
|
|
|
|
|
|
|
my @list = roll('sha1_hex', SHA); |
426
|
|
|
|
|
|
|
|
427
|
|
|
|
|
|
|
# ("Digest::SHA", "sha1_hex") |
428
|
|
|
|
|
|
|
|
429
|
|
|
|
|
|
|
=back |
430
|
|
|
|
|
|
|
|
431
|
|
|
|
|
|
|
=over 4 |
432
|
|
|
|
|
|
|
|
433
|
|
|
|
|
|
|
=item roll example 2 |
434
|
|
|
|
|
|
|
|
435
|
|
|
|
|
|
|
package main; |
436
|
|
|
|
|
|
|
|
437
|
|
|
|
|
|
|
use Earth; |
438
|
|
|
|
|
|
|
|
439
|
|
|
|
|
|
|
my @list = roll('sha1_hex', call(SHA(1), 'reset')); |
440
|
|
|
|
|
|
|
|
441
|
|
|
|
|
|
|
# (bless(do{\(my $o = '...')}, 'Digest::SHA'), "sha1_hex") |
442
|
|
|
|
|
|
|
|
443
|
|
|
|
|
|
|
=back |
444
|
|
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|
|
|
|
|
445
|
|
|
|
|
|
|
=cut |
446
|
|
|
|
|
|
|
|
447
|
|
|
|
|
|
|
=head2 then |
448
|
|
|
|
|
|
|
|
449
|
|
|
|
|
|
|
then(Str | Object | CodeRef $self, Any @args) (Any) |
450
|
|
|
|
|
|
|
|
451
|
|
|
|
|
|
|
The then function proxies the call request to the L function and returns |
452
|
|
|
|
|
|
|
the result as a list, prepended with the invocant. |
453
|
|
|
|
|
|
|
|
454
|
|
|
|
|
|
|
I> |
455
|
|
|
|
|
|
|
|
456
|
|
|
|
|
|
|
=over 4 |
457
|
|
|
|
|
|
|
|
458
|
|
|
|
|
|
|
=item then example 1 |
459
|
|
|
|
|
|
|
|
460
|
|
|
|
|
|
|
package main; |
461
|
|
|
|
|
|
|
|
462
|
|
|
|
|
|
|
use Earth; |
463
|
|
|
|
|
|
|
|
464
|
|
|
|
|
|
|
my @list = then(SHA, 'sha1_hex'); |
465
|
|
|
|
|
|
|
|
466
|
|
|
|
|
|
|
# ("Digest::SHA", "da39a3ee5e6b4b0d3255bfef95601890afd80709") |
467
|
|
|
|
|
|
|
|
468
|
|
|
|
|
|
|
=back |
469
|
|
|
|
|
|
|
|
470
|
|
|
|
|
|
|
=over 4 |
471
|
|
|
|
|
|
|
|
472
|
|
|
|
|
|
|
=cut |
473
|
|
|
|
|
|
|
|
474
|
|
|
|
|
|
|
=head2 true |
475
|
|
|
|
|
|
|
|
476
|
|
|
|
|
|
|
true() (Bool) |
477
|
|
|
|
|
|
|
|
478
|
|
|
|
|
|
|
The true function returns a truthy boolean value which is designed to be |
479
|
|
|
|
|
|
|
practically indistinguishable from the conventional numerical C<1> value. |
480
|
|
|
|
|
|
|
|
481
|
|
|
|
|
|
|
I> |
482
|
|
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|
|
|
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|
483
|
|
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|
|
|
|
=over 4 |
484
|
|
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|
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|
485
|
|
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|
|
|
|
=item true example 1 |
486
|
|
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|
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|
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|
487
|
|
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|
|
|
|
package main; |
488
|
|
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|
|
|
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|
489
|
|
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|
|
|
|
use Earth; |
490
|
|
|
|
|
|
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|
491
|
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|
|
|
|
my $true = true; |
492
|
|
|
|
|
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|
493
|
|
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|
|
|
|
# 1 |
494
|
|
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|
495
|
|
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|
|
|
|
=back |
496
|
|
|
|
|
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|
497
|
|
|
|
|
|
|
=over 4 |
498
|
|
|
|
|
|
|
|
499
|
|
|
|
|
|
|
=item true example 2 |
500
|
|
|
|
|
|
|
|
501
|
|
|
|
|
|
|
package main; |
502
|
|
|
|
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|
|
|
503
|
|
|
|
|
|
|
use Earth; |
504
|
|
|
|
|
|
|
|
505
|
|
|
|
|
|
|
my $false = !true; |
506
|
|
|
|
|
|
|
|
507
|
|
|
|
|
|
|
# 0 |
508
|
|
|
|
|
|
|
|
509
|
|
|
|
|
|
|
=back |
510
|
|
|
|
|
|
|
|
511
|
|
|
|
|
|
|
=cut |
512
|
|
|
|
|
|
|
|
513
|
|
|
|
|
|
|
=head2 wrap |
514
|
|
|
|
|
|
|
|
515
|
|
|
|
|
|
|
wrap(Str $package, Str $alias) (CodeRef) |
516
|
|
|
|
|
|
|
|
517
|
|
|
|
|
|
|
The wrap function installs a wrapper function in the calling package which when |
518
|
|
|
|
|
|
|
called either returns the package string if no arguments are provided, or calls |
519
|
|
|
|
|
|
|
L on the package with whatever arguments are provided and returns the |
520
|
|
|
|
|
|
|
result. Unless an alias is provided as a second argument, special characters |
521
|
|
|
|
|
|
|
are stripped from the package to create the function name. |
522
|
|
|
|
|
|
|
|
523
|
|
|
|
|
|
|
I> |
524
|
|
|
|
|
|
|
|
525
|
|
|
|
|
|
|
=over 4 |
526
|
|
|
|
|
|
|
|
527
|
|
|
|
|
|
|
=item wrap example 1 |
528
|
|
|
|
|
|
|
|
529
|
|
|
|
|
|
|
# given: synopsis |
530
|
|
|
|
|
|
|
|
531
|
|
|
|
|
|
|
my $coderef = wrap('Digest::SHA'); |
532
|
|
|
|
|
|
|
|
533
|
|
|
|
|
|
|
# my $digest = DigestSHA(); |
534
|
|
|
|
|
|
|
|
535
|
|
|
|
|
|
|
# "Digest::SHA" |
536
|
|
|
|
|
|
|
|
537
|
|
|
|
|
|
|
=back |
538
|
|
|
|
|
|
|
|
539
|
|
|
|
|
|
|
=over 4 |
540
|
|
|
|
|
|
|
|
541
|
|
|
|
|
|
|
=item wrap example 2 |
542
|
|
|
|
|
|
|
|
543
|
|
|
|
|
|
|
# given: synopsis |
544
|
|
|
|
|
|
|
|
545
|
|
|
|
|
|
|
my $coderef = wrap('Digest::SHA'); |
546
|
|
|
|
|
|
|
|
547
|
|
|
|
|
|
|
# my $digest = DigestSHA(1); |
548
|
|
|
|
|
|
|
|
549
|
|
|
|
|
|
|
# bless(do{\(my $o = '...')}, 'Digest::SHA') |
550
|
|
|
|
|
|
|
|
551
|
|
|
|
|
|
|
=back |
552
|
|
|
|
|
|
|
|
553
|
|
|
|
|
|
|
=over 4 |
554
|
|
|
|
|
|
|
|
555
|
|
|
|
|
|
|
=item wrap example 3 |
556
|
|
|
|
|
|
|
|
557
|
|
|
|
|
|
|
# given: synopsis |
558
|
|
|
|
|
|
|
|
559
|
|
|
|
|
|
|
my $coderef = wrap('Digest::SHA', 'SHA'); |
560
|
|
|
|
|
|
|
|
561
|
|
|
|
|
|
|
# my $digest = SHA; |
562
|
|
|
|
|
|
|
|
563
|
|
|
|
|
|
|
# "Digest::SHA" |
564
|
|
|
|
|
|
|
|
565
|
|
|
|
|
|
|
=back |
566
|
|
|
|
|
|
|
|
567
|
|
|
|
|
|
|
=over 4 |
568
|
|
|
|
|
|
|
|
569
|
|
|
|
|
|
|
=item wrap example 4 |
570
|
|
|
|
|
|
|
|
571
|
|
|
|
|
|
|
# given: synopsis |
572
|
|
|
|
|
|
|
|
573
|
|
|
|
|
|
|
my $coderef = wrap('Digest::SHA', 'SHA'); |
574
|
|
|
|
|
|
|
|
575
|
|
|
|
|
|
|
# my $digest = SHA(1); |
576
|
|
|
|
|
|
|
|
577
|
|
|
|
|
|
|
# bless(do{\(my $o = '...')}, 'Digest::SHA') |
578
|
|
|
|
|
|
|
|
579
|
|
|
|
|
|
|
=back |
580
|
|
|
|
|
|
|
|
581
|
|
|
|
|
|
|
=cut |
582
|
|
|
|
|
|
|
|
583
|
|
|
|
|
|
|
=head1 AUTHORS |
584
|
|
|
|
|
|
|
|
585
|
|
|
|
|
|
|
Awncorp, C |
586
|
|
|
|
|
|
|
|
587
|
|
|
|
|
|
|
=cut |