NAME

Catmandu::Fix::marc_copy - copy marc data in a structured way to a new field

SYNOPSIS

    # fixed field
    marc_copy(001, fixed001)

    Can result in:

    fixed001 : [
        {
            "tag": "001",
            "ind1": null,
            "ind2": null,
            "content": "fol05882032 "
        }
    ]

    And

    # variable field
    marc_copy(650, subjects)

    Can result in:

    subjects:[
        {
            "subfields" : [
                {
                    "a" : "Perl (Computer program language)"
                }
            ],
            "ind1" : " ",
            "ind2" : "0",
            "tag" : "650"
      },
      {
            "ind1" : " ",
            "subfields" : [
                {
                    "a" : "Web servers."
                }
            ],
            "tag" : "650",
            "ind2" : "0"
      }
    ]

DESCRIPTION

Copy MARC data referred by MARC_TAG in a structured way to JSON path.

In contrast to Catmandu::Fix::marc_map and Catmandu::Fix::marc_spec marc_copy will not only copy data content (values) but also all data elements like tag, indicators and subfield codes into a nested data structure.

METHODS

marc_copy(MARC_PATH, JSON_PATH, [equals: REGEX])

Copy this MARC fields referred by a MARC_PATH to a JSON_PATH.

When the MARC_PATH points to a MARC tag then only the fields mathching the MARC tag will be copied. When the MATCH_PATH contains indicators or subfields, then only the MARC_FIELDS which contain data in these subfields will be copied. Optional, a equals regular expression can be provided that should match the subfields that need to be copied:

    # Copy all the 300 fields
    marc_copy(300,tmp)

    # Copy all the 300 fields with indicator 1 = 1
    marc_copy(300[1],tmp)

    # Copy all the 300 fields which have subfield c
    marc_copy(300c,tmp)

    # Copy all the 300 fields which have subfield c equal to 'ABC'
    marc_copy(300c,tmp,equal:"^ABC")

JSON PATHS

Catmandu Fixes can be used to edit the data in the copied fields. To have easy access to the data in the copied fields, these JSON paths can be used (where VAR is the name of field into which you copied the data)

    VAR.*.tag       - The names of all MARC tags
    VAR.*.ind1      - All first indicators
    VAR.*.ind2      - All second indicators
    VAR.*.subfields.*.a - The value of all $a subfields
    VAR.*.subfields.$first.a - The value of the first $a subfield
    VAR.*.subfields.$last.a - The value of the last $a subfield
    VAR.*.content   - The value of the first control field

    VAR.$first.subfields.$first.z - The value of the second $z subfield in the first MARC field

These JSON paths can be used like:

    # Set the first indicator of all 300 fields
    do marc_each()
      if marc_has(300)
        marc_copy(300,tmp)

        # Set the first indicator to 1
        set_field(tmp.*.ind1,1)

        marc_paste(tmp)
      end
    end

INLINE

This Fix can be used inline in a Perl script:

    use Catmandu::Fix::marc_copy as => 'marc_copy';

    my $data = { record => ['650', ' ', 0, 'a', 'Perl'] };

    $data = marc_copy($data,'650','subject');

    print $data->{subject}->[0]->{tag} , "\n"; # '650'
    print $data->{subject}->[0]->{ind1} , "\n"; # ' '
    print $data->{subject}->[0]->{ind2} , "\n"; # 0
    print $data->{subject}->[0]->{subfields}->[0]->{a} , "\n"; # 'Perl'

SEE ALSO

• Catmandu::Fix::marc_cut

• Catmandu::Fix::marc_paste

LICENSE AND COPYRIGHT

This program is free software; you can redistribute it and/or modify it under the terms of either: the GNU General Public License as published by the Free Software Foundation; or the Artistic License.

See http://dev.perl.org/licenses/ for more information.