NAME¶
TM::Serializable::CSV - Topic Maps, trait for parsing (and later dumping) CSV
stream
SYNOPSIS¶
# 1) bare bones
my $tm = .....; # get a map from somewhere (can be empty)
Class::Trait->apply ($tm, "TM::Serializable::CSV");
use Perl6::Slurp;
$tm->deserialize (slurp 'myugly.csv');
# 2) exploiting the timed sync in/out mechanism
my $tm = new TM::.... (url => 'file:myugly.csv'); # get a RESOURCEABLE map from somewhere
$tm->sync_in;
DESCRIPTION¶
This trait provides parsing and dumping from CSV formatted text streams.
INTERFACE¶
Methods¶
- deserialize
- $tm->deserialize
($text )
This method consumes the text string passed in and interprets it as CSV
formatted information. What topic map information is generated, depends on
the header line (the first line):
- •
- If the header line contains a field called
"association-type", then all rows will be interpreted as
assertions. In that the remaining header fields (in that order) are
interpreted as roles (role types). For all rows in the CSV stream, the
position where the "association-type" field was is ignored. The
other fields (in that order) are affiliated with the corresponding roles.
Example:
association-type,location,bio-unit
is-born,gold-coast,rumsti
is-born,vienna,ramsti
Scoping cannot be controlled. Also all players and roles (obviously) are
directly interpreted as identifiers. Subject identifiers and locators are
not (yet) implemented.
- •
- If the header line contains a field called "id",
then all further rows will be interpreted as topic characteristics, with
each topic on one line. The column position where the "id" field
in the header is will be interpreted as toplet identifier.
All further columns will be interpreted according to the following:
- •
- If the header column is named "name", the values
will be used as topic names.
- •
- Otherwise if the value looks like a URI, an occurrence with
that URI value will be be added to the topic.
- •
- Otherwise an occurrence with a string value will be added
to the topic.
- serialize
- $tm->serialize
[Since TM 1.53] This method serializes a fragment of a topic map into CSV.
Which fragment can be controlled with the header line and
options (see constructor).
- "header_line" (only for serialization)
- This string contains a comma separated list (CSV parseable)
of headings. If one of the headings is "association-type", then
the generated CSV content will contain associations only. Nothing else is
implemented yet. The other headings control which roles (and in which
order) should be included in the CSV content. If a particular role type
has more than one player, then all players are included.
NOTE: As this is inconsistent, this will have to change.
- "type" (only for serialization)
- If existing, then this controls which association type is
to be taken.
- "baseuri" (only for serialization)
- If existing and non-zero, the base URI of the map will
remain in the identifiers. Otherwise it will be removed.
- "specification"
- If existing (and when selecting only associations), this
specification will be interpreted in the sense of "asserts" (see
TM).
Example:
$tm->serialize (header_line => 'association-type,location,bio-unit',
type => 'is-born',
baseuri => 0);
SEE ALSO¶
TM, TM::Serializable
Copyright 2010 Robert Barta.
This library is free software; you can redistribute it and/or modify it under
the same terms as Perl itself.
http://www.perl.com/perl/misc/Artistic.html