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package ETL::Yertl::Util; |
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our $VERSION = '0.036'; |
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# ABSTRACT: Utility functions for Yertl modules |
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#pod =head1 SYNOPSIS |
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#pod |
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#pod =head1 DESCRIPTION |
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#pod |
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#pod =head1 SEE ALSO |
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#pod |
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#pod =cut |
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use ETL::Yertl; |
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use Exporter qw( import ); |
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use Module::Runtime qw( use_module compose_module_name ); |
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our @EXPORT_OK = qw( |
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load_module pairs pairkeys firstidx |
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); |
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#pod =sub load_module |
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#pod |
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#pod $class = load_module( format => $format ); |
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#pod $class = load_module( protocol => $proto ); |
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#pod $class = load_module( database => $db ); |
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#pod |
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#pod Load a module of the given type with the given name. Throws an exception if the |
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#pod module is not found or the module cannot be loaded. |
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#pod |
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#pod This function should be used to load modules that the user requests. The error |
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#pod messages are suitable for user consumption. |
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#pod |
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#pod =cut |
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sub load_module { |
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my ( $type, $name ) = @_; |
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die "$type is required\n" unless $name; |
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my $class = eval { compose_module_name( 'ETL::Yertl::' . ucfirst $type, $name ) }; |
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if ( $@ ) { |
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die "Unknown $type '$name'\n"; |
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} |
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eval { |
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use_module( $class ); |
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}; |
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if ( $@ ) { |
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if ( $@ =~ /^Can't locate \S+ in \@INC/ ) { |
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die "Unknown $type '$name'\n"; |
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} |
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die "Could not load $type '$name': $@"; |
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} |
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return $class; |
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} |
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#pod =sub pairs |
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#pod |
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#pod my @pairs = pairs @array; |
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#pod |
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#pod Return an array of arrayrefs of pairs from the given even-sized array. |
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#pod |
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#pod =cut |
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# This duplicates List::Util pair, but this is not included in Perl 5.10 |
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sub pairs(@) { |
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393
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393
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1
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my ( @array ) = @_; |
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my @pairs; |
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while ( @array ) { |
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1153
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push @pairs, [ shift( @array ), shift( @array ) ]; |
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} |
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return @pairs; |
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} |
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#pod =sub pairkeys |
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#pod |
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#pod my @keys = pairkeys @array; |
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#pod |
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#pod Return the first item of every pair of items in an even-sized array. |
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#pod |
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#pod =cut |
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# This duplicates List::Util pairkeys, but this is not included in Perl 5.10 |
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sub pairkeys(@) { |
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return map $_[$_], grep { $_ % 2 == 0 } 0..$#_; |
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} |
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#pod =sub firstidx |
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#pod |
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#pod my $i = firstidx { ... } @array; |
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#pod |
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#pod Return the index of the first item that matches the code block, or C<-1> if |
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#pod none match |
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#pod |
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#pod =cut |
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# This duplicates List::Util firstidx, but this is not included in Perl 5.10 |
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sub firstidx(&@) { |
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my $code = shift; |
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for my $i ( 0 .. @_ ) { |
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local $_ = $_[ $i ]; |
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return $i if $code->(); |
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} |
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0
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return -1; |
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} |
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1; |
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__END__ |