Dodgy hack using this lib to convert LV2 to python dict.

#python-RDFdict

About

Python-RDFdict is a small utility class that uses RDFLib to represent RDF as hierarchies. It is a subclass of dict with a few added methods that help parse and structure RDF. It turns itself into a dict of dicts and lists of dicts that represents a hierarchy according to nodes.

It also allows for interpreting Literals as strings, ints and floats and URIRefs as strings according to the namespaces you specify. Some namespaces are included in namespaces.py for convenience.

I created this mainly to parse lv2 .ttl files in python but it may be useful for other purposes.

Usage

from rdfdict import RDFdict
import namespaces as ns
import rdflib
from pprint import pprint

ttl_file = "http://lv2plug.in/export/899/trunk/plugins/eg01-amp.lv2/amp.ttl"
amp = rdflib.URIRef("http://lv2plug.in/plugins/eg-amp")

rdf_dict = RDFdict()

#we parse the file into the rdf_dict.graph which is a rdflib.ConjunctiveGraph
#the subject is optional but saves time parsing only what we care about
print("Fetching and parsing the ttl file.)
print("The fetching may take a while as it's an online resource.")
rdf_dict.parse(ttl_file, subject=amp)

#we populate rdf_dict with a structure
rdf_dict.structure()

#we replace the Literals with ints, floats and strings 
#and the URIRefs according to the namespaces we know about
rdf_dict.interpret(ns.lv2, ns.w3, ns.usefulinc, ns.kxstudio)

pprint(rdf_dict[amp]["lv2:port"])

should result in an output something like:

[{rdflib.term.BNode('ub2bL95C6'): {'lv2:index': [2],
                                   'lv2:name': ['Out'],
                                   'lv2:symbol': ['out'],
                                   'rdf:type': ['lv2:AudioPort',
                                                'lv2:OutputPort']}},
 {rdflib.term.BNode('ub2bL89C6'): {'lv2:index': [1],
                                   'lv2:name': ['In'],
                                   'lv2:symbol': ['in'],
                                   'rdf:type': ['lv2:AudioPort',
                                                'lv2:InputPort']}},
 {rdflib.term.BNode('ub2bL45C11'): {'lv2:default': [0.0],
                                    'lv2:index': [0],
                                    'lv2:maximum': [24.0],
                                    'lv2:minimum': [-90.0],
                                    'lv2:name': ['Gewinn',
                                                 'Увеличение',
                                                 'Gain',
                                                 'Gain',
                                                 '收益',
                                                 'Gain',
                                                 'Aumento',
                                                 '利益',
                                                 'Guadagno'],
                                    'lv2:scalePoint': [{rdflib.term.BNode('ub2bL85C7'): {'rdf:value': [-10.0],
                                                                                         'rdfs:label': ['-10']}},
                                                       {rdflib.term.BNode('ub2bL82C7'): {'rdf:value': [-5.0],
                                                                                         'rdfs:label': ['-5']}},
                                                       {rdflib.term.BNode('ub2bL76C18'): {'rdf:value': [5.0],
                                                                                          'rdfs:label': ['+5']}},
                                                       {rdflib.term.BNode('ub2bL79C7'): {'rdf:value': [0.0],
                                                                                         'rdfs:label': ['0']}}],
                                    'lv2:symbol': ['gain'],
                                    'rdf:type': ['lv2:InputPort',
                                                 'lv2:ControlPort']}}]

License

Copyright 2014 Kaspar Emanuel <kaspar.emanuel@gmail.com> 

Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.

THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.