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metadata.py
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metadata.py
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#!/usr/bin/python
# coding=utf-8
#
# Metadata Description File parser.
#
# Copyright (C) 2015 Reece H. Dunn
#
# This file is part of cmudict-tools.
#
# cmudict-tools is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# cmudict-tools is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with cmudict-tools. If not, see <http://www.gnu.org/licenses/>.
import os
import re
import sys
import csv
import json
import codecs
import subprocess
##### CSV Parser ##############################################################
if sys.version_info[0] == 2:
def read_csvdict(filename):
with open(filename, 'rb') as f:
for entry in csv.reader(f):
yield [x.decode('utf-8') for x in entry]
else:
def read_csvdict(filename):
with open(filename, 'rb') as f:
for entry in csv.reader(codecs.iterdecode(f, 'utf-8')):
yield entry
def parse_csv(filename):
columns = None
for entry in read_csvdict(filename):
entry = [ None if x == '' else x for x in entry ]
if entry[0] == None:
pass # Comment only line
elif columns:
yield dict(zip(columns, entry))
else:
columns = entry
##### RDF Object Model ########################################################
class Resource:
pass
class IRI(Resource):
def __init__(self, data):
self.href = data[0]
def __repr__(self):
return 'IRI({0})'.format(self.href)
def match(self, other):
if isinstance(other, IRI):
return self.href == other.href
return False
class Namespace:
def __init__(self, prefix, base):
self.prefix = prefix
self.base = base
def __getitem__(self, name):
return IRI(['{0}{1}'.format(self.base, name)])
foaf = Namespace('foaf', 'http://xmlns.com/foaf/0.1/')
org = Namespace('org', 'http://www.w3.org/ns/org#')
rdf = Namespace('rdf', 'http://www.w3.org/1999/02/22-rdf-syntax-ns#')
skos = Namespace('skos', 'http://www.w3.org/2004/02/skos/core#')
class BNode(Resource):
def __init__(self, data):
self.name = data[0]
def __repr__(self):
return 'BNode({0})'.format(self.name)
def match(self, other):
if isinstance(other, BNode):
return self.name == other.name
return False
class Literal:
def __init__(self, data):
self.text = data[0]
self.lang = data[1]
self.datatype = IRI(data[2]) if data[2] else None
def __repr__(self):
if self.lang:
return 'Literal({0}|lang={1})'.format(self.text, self.lang)
elif self.datatype:
return 'Literal({0}|datatype={2})'.format(self.text, self.datatype)
else:
return 'Literal({0})'.format(self.text)
def match(self, other):
if isinstance(other, Literal):
if not self.text == other.text:
return False
if not self.lang == other.lang:
return False
if not self.datatype and not self.datatype:
return True
if not self.datatype or not self.datatype:
return False
return self.datatype.match(other.datatype)
return False
class Graph:
def __init__(self):
self.triples = []
def add_triple(self, sub, pred, obj):
self.triples.append((sub, pred, obj))
def select(self, subject=None, predicate=None, obj=None):
for s, p, o in self.triples:
if subject and not s.match(subject):
continue
if predicate and not p.match(predicate):
continue
if obj and not o.match(obj):
continue
yield s, p, o
##### RDF Metadata Parser #####################################################
tokens = [
(IRI, re.compile(r'^<([^>]*)>')),
(Literal, re.compile(r'"([^"]*)"@([^ \t]+)()')), # language literal
(Literal, re.compile(r'"([^"]*)"()\^\^(<([^>]*)>)')), # datatype literal
(Literal, re.compile(r'"([^"]*)"()()')),
(BNode, re.compile(r'_:([^ \t]+)')),
(None, re.compile(r'\s+')),
(None, re.compile(r'\.')),
]
def parse_ntriple(triple):
while triple != '':
matched = False
for token, matcher in tokens:
m = matcher.match(triple)
if m:
if token:
yield token(m.groups())
triple = triple[m.end()+1:]
matched = True
if not matched:
raise Exception('Unknown data in N-Triple output: {0}'.format(triple))
def parse_rdf(filename, input_format=None):
with open(filename, 'rb') as f:
srcdata = f.read()
if not input_format:
if srcdata.startswith(b'#') or srcdata.startswith(b'@prefix'):
input_format = 'turtle'
elif srcdata.startswith(b'<!--') or srcdata.startswith(b'<?xml'):
input_format = 'rdfxml'
else:
input_format = 'ntriples'
graph = Graph()
if input_format == 'ntriples':
stdout = srcdata
else:
rapper = subprocess.Popen(['rapper', '-', filename, '--input', input_format, '--output', 'ntriples'], stdout=subprocess.PIPE, stdin=subprocess.PIPE, stderr=subprocess.PIPE)
stdout, stderr = rapper.communicate(input=srcdata)
for triple in stdout.decode('utf-8').split('\n'):
data = list(parse_ntriple(triple))
if len(data) == 0:
continue
graph.add_triple(*data)
return graph
##### Metadata Parsers ########################################################
def parse_rdf_metadata(filename):
graph = parse_rdf(filename)
metadata = {}
for scheme, _, _ in graph.select(predicate=rdf['type'], obj=skos['ConceptScheme']):
ref = None
for s, p, o in graph.select(subject=scheme):
if p.match(skos['prefLabel']):
ref = o.text
metadata[ref] = []
if not ref:
continue
for concept, _, _ in graph.select(predicate=skos['inScheme'], obj=scheme):
for s, p, o in graph.select(subject=concept):
if p.match(skos['prefLabel']):
metadata[ref].append(o.text)
return metadata
def parse_csv_metadata(filename):
metadata = {}
for data in parse_csv(filename):
if not data['Key'] in metadata.keys():
metadata[data['Key']] = []
metadata[data['Key']].append(data['Value'])
return metadata
def parse(filename):
if filename.endswith('.csv'):
return parse_csv_metadata(filename)
return parse_rdf_metadata(filename)
##### Command-Line Interface ##################################################
if __name__ == '__main__':
print(json.dumps(parse(sys.argv[1]), sort_keys=True))