1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
|
"""
Parser plugin interface.
This module defines the parser plugin interface and contains other
related parser support code.
The module is mainly useful for those wanting to write a parser that
can plugin to rdflib. If you are wanting to invoke a parser you likely
want to do so through the Graph class parse method.
"""
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
import os
import sys
from io import BytesIO
from urllib.request import pathname2url
from urllib.request import Request
from urllib.request import url2pathname
from urllib.parse import urljoin
from urllib.request import urlopen
from xml.sax import xmlreader
from rdflib import __version__
from rdflib.term import URIRef
from rdflib.namespace import Namespace
__all__ = [
"Parser",
"InputSource",
"StringInputSource",
"URLInputSource",
"FileInputSource",
]
class Parser(object):
def __init__(self):
pass
def parse(self, source, sink):
pass
class InputSource(xmlreader.InputSource, object):
"""
TODO:
"""
def __init__(self, system_id=None):
xmlreader.InputSource.__init__(self, system_id=system_id)
self.content_type = None
self.auto_close = False # see Graph.parse(), true if opened by us
def close(self):
f = self.getByteStream()
if f and hasattr(f, "close"):
f.close()
class StringInputSource(InputSource):
"""
TODO:
"""
def __init__(self, value, system_id=None):
super(StringInputSource, self).__init__(system_id)
stream = BytesIO(value)
self.setByteStream(stream)
# TODO:
# encoding = value.encoding
# self.setEncoding(encoding)
headers = {
"User-agent": "rdflib-%s (http://rdflib.net/; eikeon@eikeon.com)" % __version__
}
class URLInputSource(InputSource):
"""
TODO:
"""
def __init__(self, system_id=None, format=None):
super(URLInputSource, self).__init__(system_id)
self.url = system_id
# copy headers to change
myheaders = dict(headers)
if format == "application/rdf+xml":
myheaders["Accept"] = "application/rdf+xml, */*;q=0.1"
elif format == "n3":
myheaders["Accept"] = "text/n3, */*;q=0.1"
elif format == "turtle":
myheaders["Accept"] = "text/turtle,application/x-turtle, */*;q=0.1"
elif format == "nt":
myheaders["Accept"] = "text/plain, */*;q=0.1"
elif format == "json-ld":
myheaders[
"Accept"
] = "application/ld+json, application/json;q=0.9, */*;q=0.1"
else:
myheaders["Accept"] = (
"application/rdf+xml,text/rdf+n3;q=0.9,"
+ "application/xhtml+xml;q=0.5, */*;q=0.1"
)
req = Request(system_id, None, myheaders)
file = urlopen(req)
# Fix for issue 130 https://github.com/RDFLib/rdflib/issues/130
self.url = file.geturl() # in case redirections took place
self.setPublicId(self.url)
self.content_type = file.info().get("content-type")
if self.content_type is not None:
self.content_type = self.content_type.split(";", 1)[0]
self.setByteStream(file)
# TODO: self.setEncoding(encoding)
self.response_info = file.info() # a mimetools.Message instance
def __repr__(self):
return self.url
class FileInputSource(InputSource):
def __init__(self, file):
base = urljoin("file:", pathname2url(os.getcwd()))
system_id = URIRef(urljoin("file:", pathname2url(file.name)), base=base)
super(FileInputSource, self).__init__(system_id)
self.file = file
self.setByteStream(file)
# TODO: self.setEncoding(encoding)
def __repr__(self):
return repr(self.file)
def create_input_source(
source=None, publicID=None, location=None, file=None, data=None, format=None
):
"""
Return an appropriate InputSource instance for the given
parameters.
"""
# test that exactly one of source, location, file, and data is not None.
if (
sum(
(
source is not None,
location is not None,
file is not None,
data is not None,
)
)
!= 1
):
raise ValueError("exactly one of source, location, file or data must be given")
input_source = None
if source is not None:
if isinstance(source, InputSource):
input_source = source
else:
if isinstance(source, str):
location = source
elif hasattr(source, "read") and not isinstance(source, Namespace):
f = source
input_source = InputSource()
input_source.setByteStream(f)
if f is sys.stdin:
input_source.setSystemId("file:///dev/stdin")
elif hasattr(f, "name"):
input_source.setSystemId(f.name)
else:
raise Exception(
"Unexpected type '%s' for source '%s'" % (type(source), source)
)
absolute_location = None # Further to fix for issue 130
auto_close = False # make sure we close all file handles we open
if location is not None:
# Fix for Windows problem https://github.com/RDFLib/rdflib/issues/145
if os.path.exists(location):
location = pathname2url(location)
base = urljoin("file:", "%s/" % pathname2url(os.getcwd()))
absolute_location = URIRef(location, base=base).defrag()
if absolute_location.startswith("file:///"):
filename = url2pathname(absolute_location.replace("file:///", "/"))
file = open(filename, "rb")
else:
input_source = URLInputSource(absolute_location, format)
auto_close = True
# publicID = publicID or absolute_location # Further to fix
# for issue 130
if file is not None:
input_source = FileInputSource(file)
if data is not None:
if isinstance(data, str):
data = data.encode("utf-8")
input_source = StringInputSource(data)
auto_close = True
if input_source is None:
raise Exception("could not create InputSource")
else:
input_source.auto_close |= auto_close
if publicID is not None: # Further to fix for issue 130
input_source.setPublicId(publicID)
# Further to fix for issue 130
elif input_source.getPublicId() is None:
input_source.setPublicId(absolute_location or "")
return input_source
|
