Mercurial > repos > guerler > springsuite

annotate planemo/lib/python3.7/site-packages/rdflib/parser.py @ 1:56ad4e20f292 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400
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1
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1 """
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2 Parser plugin interface.
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3
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4 This module defines the parser plugin interface and contains other
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5 related parser support code.
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6
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7 The module is mainly useful for those wanting to write a parser that
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8 can plugin to rdflib. If you are wanting to invoke a parser you likely
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9 want to do so through the Graph class parse method.
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10
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11 """
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12
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13 import os
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14 import sys
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15 from urllib.request import pathname2url, url2pathname
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16 from urllib.request import urlopen, Request
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17 from urllib.parse import urljoin
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18 from rdflib.py3compat import PY3
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19 if PY3:
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20 from io import BytesIO
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21 assert BytesIO
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22 else:
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23 from io import StringIO as BytesIO
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24 from xml.sax import xmlreader
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25
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26 from rdflib import __version__
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27 from rdflib.term import URIRef
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28 from rdflib.namespace import Namespace
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29
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30 __all__ = [
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31 'Parser', 'InputSource', 'StringInputSource',
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32 'URLInputSource', 'FileInputSource']
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33
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34
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35 class Parser(object):
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36
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37 def __init__(self):
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38 pass
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39
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40 def parse(self, source, sink):
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41 pass
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42
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43
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44 class InputSource(xmlreader.InputSource, object):
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45 """
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46 TODO:
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47 """
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48
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49 def __init__(self, system_id=None):
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50 xmlreader.InputSource.__init__(self, system_id=system_id)
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51 self.content_type = None
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52 self.auto_close = False # see Graph.parse(), true if opened by us
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53
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54 def close(self):
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55 f = self.getByteStream()
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56 if f and hasattr(f, 'close'):
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57 f.close()
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58
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59
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60 class StringInputSource(InputSource):
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61 """
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62 TODO:
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63 """
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64
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65 def __init__(self, value, system_id=None):
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66 super(StringInputSource, self).__init__(system_id)
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67 stream = BytesIO(value)
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68 self.setByteStream(stream)
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69 # TODO:
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70 # encoding = value.encoding
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71 # self.setEncoding(encoding)
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72
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73
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74 headers = {
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75 'User-agent':
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76 'rdflib-%s (http://rdflib.net/; eikeon@eikeon.com)' % __version__
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77 }
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78
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79
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80 class URLInputSource(InputSource):
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81 """
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82 TODO:
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83 """
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84
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85 def __init__(self, system_id=None, format=None):
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86 super(URLInputSource, self).__init__(system_id)
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87 self.url = system_id
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88
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89 # copy headers to change
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90 myheaders = dict(headers)
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91 if format == 'application/rdf+xml':
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92 myheaders['Accept'] = 'application/rdf+xml, */*;q=0.1'
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93 elif format == 'n3':
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94 myheaders['Accept'] = 'text/n3, */*;q=0.1'
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95 elif format == 'nt':
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96 myheaders['Accept'] = 'text/plain, */*;q=0.1'
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97 elif format == 'json-ld':
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98 myheaders['Accept'] = (
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99 'application/ld+json, application/json;p=0.9, */*;q=0.1')
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100 else:
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101 myheaders['Accept'] = (
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102 'application/rdf+xml,text/rdf+n3;q=0.9,' +
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103 'application/xhtml+xml;q=0.5, */*;q=0.1')
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104
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105 req = Request(system_id, None, myheaders)
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106 file = urlopen(req)
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107 # Fix for issue 130 https://github.com/RDFLib/rdflib/issues/130
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108 self.url = file.geturl() # in case redirections took place
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109 self.setPublicId(self.url)
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110 self.content_type = file.info().get('content-type')
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111 if self.content_type is not None:
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112 self.content_type = self.content_type.split(";", 1)[0]
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113 self.setByteStream(file)
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114 # TODO: self.setEncoding(encoding)
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115 self.response_info = file.info() # a mimetools.Message instance
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116
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117 def __repr__(self):
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118 return self.url
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119
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120
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121 class FileInputSource(InputSource):
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122
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123 def __init__(self, file):
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124 base = urljoin("file:", pathname2url(os.getcwd()))
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125 system_id = URIRef(urljoin("file:", pathname2url(file.name)), base=base)
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126 super(FileInputSource, self).__init__(system_id)
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127 self.file = file
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128 self.setByteStream(file)
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129 # TODO: self.setEncoding(encoding)
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130
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131 def __repr__(self):
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132 return repr(self.file)
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133
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134
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135 def create_input_source(source=None, publicID=None,
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136 location=None, file=None, data=None, format=None):
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137 """
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138 Return an appropriate InputSource instance for the given
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139 parameters.
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140 """
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141
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142 # test that exactly one of source, location, file, and data is not None.
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143 if sum((
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144 source is not None,
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145 location is not None,
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146 file is not None,
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147 data is not None,
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148 )) != 1:
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149 raise ValueError(
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150 'exactly one of source, location, file or data must be given'
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151 )
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152
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153 input_source = None
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154
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155 if source is not None:
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156 if isinstance(source, InputSource):
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157 input_source = source
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158 else:
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159 if isinstance(source, str):
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160 location = source
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161 elif hasattr(source, "read") and not isinstance(source, Namespace):
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162 f = source
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163 input_source = InputSource()
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164 input_source.setByteStream(f)
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165 if f is sys.stdin:
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166 input_source.setSystemId("file:///dev/stdin")
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167 elif hasattr(f, "name"):
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168 input_source.setSystemId(f.name)
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169 else:
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170 raise Exception("Unexpected type '%s' for source '%s'" %
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171 (type(source), source))
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172
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173 absolute_location = None # Further to fix for issue 130
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174
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175 auto_close = False # make sure we close all file handles we open
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176 if location is not None:
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177 # Fix for Windows problem https://github.com/RDFLib/rdflib/issues/145
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178 if os.path.exists(location):
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179 location = pathname2url(location)
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180 base = urljoin("file:", "%s/" % pathname2url(os.getcwd()))
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181 absolute_location = URIRef(location, base=base).defrag()
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182 if absolute_location.startswith("file:///"):
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183 filename = url2pathname(absolute_location.replace("file:///", "/"))
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184 file = open(filename, "rb")
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185 else:
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186 input_source = URLInputSource(absolute_location, format)
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187 auto_close = True
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188 # publicID = publicID or absolute_location # Further to fix
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189 # for issue 130
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190
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191 if file is not None:
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192 input_source = FileInputSource(file)
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193
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194 if data is not None:
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195 if isinstance(data, str):
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196 data = data.encode('utf-8')
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197 input_source = StringInputSource(data)
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198 auto_close = True
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199
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200 if input_source is None:
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201 raise Exception("could not create InputSource")
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202 else:
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203 input_source.auto_close |= auto_close
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204 if publicID is not None: # Further to fix for issue 130
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205 input_source.setPublicId(publicID)
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206 # Further to fix for issue 130
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207 elif input_source.getPublicId() is None:
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208 input_source.setPublicId(absolute_location or "")
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209 return input_source