Data::Downloader::MetadataTransformation
Apply transformations to metadata before making linktrees.
A metadata transformation is an object which is associated with a repository, that describes a transformation that should be applied before the linktree template is filled in.
It consists of :
input - the name of the metadata item to be transformed output - the name of the variable in the path template (or intermediate variable) function_name - the function to be applied function_params - the parameters to be sent to that function
Valid functions are currently :
split - split an incoming piece of metadata using a regular expression. function_params : optional regex (defaults to whitespeace) match - match a piece of metadata against a pattern. function_params : regex to match against. extract - extract a captured portion of a regular expression. function_params : a regex with a set of capturing parentheses.
Suppose a metadata named "tags" contains a list of words separated by whitespace. The following sequence of transformations would convert this single string into a list of strings, but only include the words which contain the letter "g" or "p":
metadata_transformations: - input : tags output : one_tag function_name : split order_key : 1 - input : one_tag output : tag function_name : match function_params : "g|p" order_key : 2
After applying these transformations, the string "<tag>" may be used in the linktree templates.
Apply a transformation to a hash of data.
Input : - a hash of data, one of the keys should match the input for this transformation.
Output : - an array of hashes: all of the keys are the same as the input hash, but there is a new key in each hash which corresponds to the output of the transformation.
Example :
$self->apply( { foo => "bar baz"} ); where $self->input is foo $self->output is boo $self->function_name is split produces [ { foo => "bar baz", boo => "bar" }, { foo => "bar baz", boo => "baz" } ]
1 POD Error
The following errors were encountered while parsing the POD:
=over without closing =back
To install Data::Downloader, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Data::Downloader
CPAN shell
perl -MCPAN -e shell install Data::Downloader
For more information on module installation, please visit the detailed CPAN module installation guide.