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# Copyright 2009, 2010, 2011, 2013, 2016 Kevin Ryde |
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# This file is part of Time-Duration-Locale. |
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# |
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# Time-Duration-Locale is free software; you can redistribute it and/or |
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# modify it under the terms of the GNU General Public License as published |
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# by the Free Software Foundation; either version 3, or (at your option) any |
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# later version. |
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# |
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# Time-Duration-Locale is distributed in the hope that it will be useful, |
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# but WITHOUT ANY WARRANTY; without even the implied warranty of |
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General |
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# Public License for more details. |
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# |
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# You should have received a copy of the GNU General Public License along |
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# with Time-Duration-Locale. If not, see . |
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package Time::Duration::Locale; |
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use 5.004; |
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use strict; |
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use Carp; |
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use Time::Duration::LocaleObject; |
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use vars qw($VERSION @ISA @EXPORT @EXPORT_OK %EXPORT_TAGS $AUTOLOAD); |
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$VERSION = 11; |
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use Exporter; |
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@ISA = ('Exporter'); |
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# same exports as Time::Duration |
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@EXPORT = qw(later later_exact earlier earlier_exact |
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ago ago_exact from_now from_now_exact |
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duration duration_exact |
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concise); |
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@EXPORT_OK = ('interval', @EXPORT); |
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%EXPORT_TAGS = (all => \@EXPORT_OK); |
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# uncomment this to run the ### lines |
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#use Smart::Comments; |
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# SUPER::can() here is UNIVERSAL::can(). When an autoloaded function like |
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# duration() is exported, UNIVERSAL::can() returns the stub coderef which |
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# calls to AUTOLOAD. This means AUTOLOAD() can't rely on can() to get the |
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# dispatcher func, it has to make its own. Or unless can() oughtn't use |
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# SUPER::can this way ... |
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# |
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# If $name exists as a method in Time::Duration::LocaleObject, meaning a |
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# function in Time::Duration or langugage-specifc module, then create *$name |
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# so as to have just one copy of which can() will return each time and so as |
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# not to go through AUTOLOAD() every time. |
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# |
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# If $name is unknown then don't create a dispatcher, firstly of course so |
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# can() is false, and secondly to avoid junking up the package if a caller |
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# gets a name wrong. |
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# |
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sub can { |
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my ($class, $name) = @_; |
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### TDL can(): $name |
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return $class->SUPER::can($name) || _make_dispatcher($name); |
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} |
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sub AUTOLOAD { |
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my $name = $AUTOLOAD; |
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### TDL AUTOLOAD(): $name |
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$name =~ s/.*://; |
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my $code = _make_dispatcher($name) || croak "No such function $name()"; |
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goto $code; |
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} |
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# The method call to Time::Duration::LocaleObject here is "by name". Could |
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# instead go to the coderef returned by can(), like |
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# |
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# sub { unshift @_, 'Time::Duration::LocaleObject'; goto $can; }; |
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# |
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# Dunno if there's more merit in the name or the coderef. The name would |
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# support redefinitions (though the base TDLObj->can() returns the same subr |
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# every time). The coderef might save a couple of cycles. |
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# |
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sub _make_dispatcher { |
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my ($name) = @_; |
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Time::Duration::LocaleObject->can($name) or return undef; |
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my $subr = sub { |
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#### TDL dispatch to TDLObj method: $name |
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return Time::Duration::LocaleObject->$name (@_); |
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}; |
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{ no strict 'refs'; *$name = $subr } |
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return $subr; |
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} |
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1; |
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__END__ |