Mercurial > repos > shellac > sam_consensus_v3

annotate env/lib/python3.9/site-packages/rdflib/extras/describer.py @ 0:4f3585e2f14b draft default tip

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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author shellac
date Mon, 22 Mar 2021 18:12:50 +0000
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1 #!/usr/bin/env python
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2 # -*- coding: utf-8 -*-
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3 from __future__ import absolute_import
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4 from __future__ import division
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5 from __future__ import print_function
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6
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7
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8 __doc__ = """
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9 A Describer is a stateful utility for creating RDF statements in a
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10 semi-declarative manner. It has methods for creating literal values, rel and
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11 rev resource relations (somewhat resembling RDFa).
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12
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13 The `rel` and ``rev`` methods return a context manager which sets the current
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14 about to the referenced resource for the context scope (for use with the
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15 ``with`` statement).
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16
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17 Full example in the ``to_rdf`` method below::
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18
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19 >>> import datetime
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20 >>> from rdflib.graph import Graph
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21 >>> from rdflib.namespace import Namespace, RDFS, FOAF
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22 >>>
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23 >>> ORG_URI = "http://example.org/"
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24 >>>
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25 >>> CV = Namespace("http://purl.org/captsolo/resume-rdf/0.2/cv#")
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26 >>>
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27 >>> class Person(object):
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28 ... def __init__(self):
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29 ... self.first_name = u"Some"
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30 ... self.last_name = u"Body"
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31 ... self.username = "some1"
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32 ... self.presentation = u"Just a Python & RDF hacker."
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33 ... self.image = "/images/persons/" + self.username + ".jpg"
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34 ... self.site = "http://example.net/"
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35 ... self.start_date = datetime.date(2009, 9, 4)
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36 ... def get_full_name(self):
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37 ... return u" ".join([self.first_name, self.last_name])
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38 ... def get_absolute_url(self):
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39 ... return "/persons/" + self.username
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40 ... def get_thumbnail_url(self):
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41 ... return self.image.replace('.jpg', '-thumb.jpg')
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42 ...
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43 ... def to_rdf(self):
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44 ... graph = Graph()
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45 ... graph.bind('foaf', FOAF)
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46 ... graph.bind('cv', CV)
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47 ... lang = 'en'
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48 ... d = Describer(graph, base=ORG_URI)
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49 ... d.about(self.get_absolute_url()+'#person')
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50 ... d.rdftype(FOAF.Person)
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51 ... d.value(FOAF.name, self.get_full_name())
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52 ... d.value(FOAF.givenName, self.first_name)
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53 ... d.value(FOAF.familyName, self.last_name)
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54 ... d.rel(FOAF.homepage, self.site)
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55 ... d.value(RDFS.comment, self.presentation, lang=lang)
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56 ... with d.rel(FOAF.depiction, self.image):
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57 ... d.rdftype(FOAF.Image)
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58 ... d.rel(FOAF.thumbnail, self.get_thumbnail_url())
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59 ... with d.rev(CV.aboutPerson):
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60 ... d.rdftype(CV.CV)
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61 ... with d.rel(CV.hasWorkHistory):
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62 ... d.value(CV.startDate, self.start_date)
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63 ... d.rel(CV.employedIn, ORG_URI+"#company")
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64 ... return graph
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65 ...
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66 >>> person_graph = Person().to_rdf()
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67 >>> expected = Graph().parse(data='''<?xml version="1.0" encoding="utf-8"?>
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68 ... <rdf:RDF
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69 ... xmlns:foaf="http://xmlns.com/foaf/0.1/"
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70 ... xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
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71 ... xmlns:cv="http://purl.org/captsolo/resume-rdf/0.2/cv#"
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72 ... xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#">
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73 ... <foaf:Person rdf:about="http://example.org/persons/some1#person">
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74 ... <foaf:name>Some Body</foaf:name>
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75 ... <foaf:givenName>Some</foaf:givenName>
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76 ... <foaf:familyName>Body</foaf:familyName>
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77 ... <foaf:depiction>
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78 ... <foaf:Image
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79 ... rdf:about=
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80 ... "http://example.org/images/persons/some1.jpg">
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81 ... <foaf:thumbnail
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82 ... rdf:resource=
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83 ... "http://example.org/images/persons/some1-thumb.jpg"/>
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84 ... </foaf:Image>
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85 ... </foaf:depiction>
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86 ... <rdfs:comment xml:lang="en">
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87 ... Just a Python &amp; RDF hacker.
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88 ... </rdfs:comment>
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89 ... <foaf:homepage rdf:resource="http://example.net/"/>
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90 ... </foaf:Person>
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91 ... <cv:CV>
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92 ... <cv:aboutPerson
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93 ... rdf:resource="http://example.org/persons/some1#person">
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94 ... </cv:aboutPerson>
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95 ... <cv:hasWorkHistory>
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96 ... <rdf:Description>
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97 ... <cv:startDate
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98 ... rdf:datatype="http://www.w3.org/2001/XMLSchema#date"
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99 ... >2009-09-04</cv:startDate>
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100 ... <cv:employedIn rdf:resource="http://example.org/#company"/>
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101 ... </rdf:Description>
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102 ... </cv:hasWorkHistory>
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103 ... </cv:CV>
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104 ... </rdf:RDF>
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105 ... ''')
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106 >>>
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107 >>> from rdflib.compare import isomorphic
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108 >>> isomorphic(person_graph, expected) #doctest: +SKIP
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109 True
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110 """
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111
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112 from contextlib import contextmanager
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113 from rdflib.graph import Graph
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114 from rdflib.namespace import RDF
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115 from rdflib.term import BNode
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116 from rdflib.term import Identifier
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117 from rdflib.term import Literal
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118 from rdflib.term import URIRef
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119
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120
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121 class Describer(object):
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122
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123 def __init__(self, graph=None, about=None, base=None):
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124 if graph is None:
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125 graph = Graph()
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126 self.graph = graph
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127 self.base = base
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128 self._subjects = []
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129 self.about(about or None)
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130
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131 def about(self, subject, **kws):
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132 """
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133 Sets the current subject. Will convert the given object into an
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134 ``URIRef`` if it's not an ``Identifier``.
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135
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136 Usage::
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137
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138 >>> d = Describer()
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139 >>> d._current() #doctest: +ELLIPSIS
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140 rdflib.term.BNode(...)
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141 >>> d.about("http://example.org/")
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142 >>> d._current()
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143 rdflib.term.URIRef(u'http://example.org/')
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144
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145 """
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146 kws.setdefault('base', self.base)
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147 subject = cast_identifier(subject, **kws)
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148 if self._subjects:
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149 self._subjects[-1] = subject
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150 else:
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151 self._subjects.append(subject)
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152
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153 def value(self, p, v, **kws):
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154 """
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155 Set a literal value for the given property. Will cast the value to an
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156 ``Literal`` if a plain literal is given.
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157
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158 Usage::
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159
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160 >>> from rdflib import URIRef
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161 >>> from rdflib.namespace import RDF, RDFS
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162 >>> d = Describer(about="http://example.org/")
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163 >>> d.value(RDFS.label, "Example")
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164 >>> d.graph.value(URIRef('http://example.org/'), RDFS.label)
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165 rdflib.term.Literal(u'Example')
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166
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167 """
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168 v = cast_value(v, **kws)
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169 self.graph.add((self._current(), p, v))
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170
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171 def rel(self, p, o=None, **kws):
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172 """Set an object for the given property. Will convert the given object
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173 into an ``URIRef`` if it's not an ``Identifier``. If none is given, a
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174 new ``BNode`` is used.
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175
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176 Returns a context manager for use in a ``with`` block, within which the
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177 given object is used as current subject.
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178
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179 Usage::
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180
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181 >>> from rdflib import URIRef
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182 >>> from rdflib.namespace import RDF, RDFS
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183 >>> d = Describer(about="/", base="http://example.org/")
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184 >>> _ctxt = d.rel(RDFS.seeAlso, "/about")
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185 >>> d.graph.value(URIRef('http://example.org/'), RDFS.seeAlso)
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186 rdflib.term.URIRef(u'http://example.org/about')
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187
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188 >>> with d.rel(RDFS.seeAlso, "/more"):
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189 ... d.value(RDFS.label, "More")
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190 >>> (URIRef('http://example.org/'), RDFS.seeAlso,
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191 ... URIRef('http://example.org/more')) in d.graph
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192 True
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193 >>> d.graph.value(URIRef('http://example.org/more'), RDFS.label)
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194 rdflib.term.Literal(u'More')
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195
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196 """
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197
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198 kws.setdefault('base', self.base)
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199 p = cast_identifier(p)
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200 o = cast_identifier(o, **kws)
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201 self.graph.add((self._current(), p, o))
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202 return self._subject_stack(o)
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203
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204 def rev(self, p, s=None, **kws):
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205 """
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206 Same as ``rel``, but uses current subject as *object* of the relation.
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207 The given resource is still used as subject in the returned context
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208 manager.
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209
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210 Usage::
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211
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212 >>> from rdflib import URIRef
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213 >>> from rdflib.namespace import RDF, RDFS
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214 >>> d = Describer(about="http://example.org/")
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215 >>> with d.rev(RDFS.seeAlso, "http://example.net/"):
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216 ... d.value(RDFS.label, "Net")
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217 >>> (URIRef('http://example.net/'), RDFS.seeAlso,
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218 ... URIRef('http://example.org/')) in d.graph
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219 True
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220 >>> d.graph.value(URIRef('http://example.net/'), RDFS.label)
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221 rdflib.term.Literal(u'Net')
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222
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223 """
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224 kws.setdefault('base', self.base)
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225 p = cast_identifier(p)
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226 s = cast_identifier(s, **kws)
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227 self.graph.add((s, p, self._current()))
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228 return self._subject_stack(s)
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229
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230 def rdftype(self, t):
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231 """
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232 Shorthand for setting rdf:type of the current subject.
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233
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234 Usage::
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235
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236 >>> from rdflib import URIRef
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237 >>> from rdflib.namespace import RDF, RDFS
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238 >>> d = Describer(about="http://example.org/")
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239 >>> d.rdftype(RDFS.Resource)
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240 >>> (URIRef('http://example.org/'),
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241 ... RDF.type, RDFS.Resource) in d.graph
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242 True
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243
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244 """
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245 self.graph.add((self._current(), RDF.type, t))
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246
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247 def _current(self):
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248 return self._subjects[-1]
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249
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250 @contextmanager
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251 def _subject_stack(self, subject):
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252 self._subjects.append(subject)
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253 yield None
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254 self._subjects.pop()
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255
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256
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257 def cast_value(v, **kws):
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258 if not isinstance(v, Literal):
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259 v = Literal(v, **kws)
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260 return v
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261
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262
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263 def cast_identifier(ref, **kws):
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264 ref = ref or BNode()
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265 if not isinstance(ref, Identifier):
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266 ref = URIRef(ref, **kws)
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267 return ref