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

"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400
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1 # -*- coding: utf-8 -*-
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2 """
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3 Implementation of the JSON-LD Context structure. See:
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4
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5 http://json-ld.org/
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6
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7 """
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8 from collections import namedtuple
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9 from rdflib.namespace import RDF
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10
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11 from .keys import (BASE, CONTAINER, CONTEXT, GRAPH, ID, INDEX, LANG, LIST,
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12 REV, SET, TYPE, VALUE, VOCAB)
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13 from . import errors
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14 from .util import source_to_json, urljoin, urlsplit, split_iri, norm_url
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15
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16
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17 NODE_KEYS = set([LANG, ID, TYPE, VALUE, LIST, SET, REV, GRAPH])
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18
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19 class Defined(int): pass
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20 UNDEF = Defined(0)
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21
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22
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23 class Context(object):
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24
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25 def __init__(self, source=None, base=None):
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26 self.language = None
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27 self.vocab = None
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28 self.base = base
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29 self.doc_base = base
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30 self.terms = {}
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31 self._alias = {}
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32 self._lookup = {}
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33 self._prefixes = {}
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34 self.active = False
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35 if source:
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36 self.load(source)
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37
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38 @property
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39 def base(self):
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40 return self._base
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41
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42 @base.setter
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43 def base(self, base):
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44 if base:
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45 hash_index = base.find('#')
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46 if hash_index > -1:
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47 base = base[0:hash_index]
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48 self._base = self.resolve_iri(base) if (
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49 hasattr(self, '_base') and base is not None) else base
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50 self._basedomain = '%s://%s' % urlsplit(base)[0:2] if base else None
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51
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52 def subcontext(self, source):
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53 # IMPROVE: to optimize, implement SubContext with parent fallback support
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54 ctx = Context()
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55 ctx.language = self.language
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56 ctx.vocab = self.vocab
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57 ctx.base = self.base
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58 ctx.doc_base = self.doc_base
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59 ctx._alias = self._alias.copy()
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60 ctx.terms = self.terms.copy()
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61 ctx._lookup = self._lookup.copy()
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62 ctx._prefixes = self._prefixes.copy()
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63 ctx.load(source)
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64 return ctx
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65
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66 def get_id(self, obj):
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67 return self._get(obj, ID)
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68
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69 def get_type(self, obj):
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70 return self._get(obj, TYPE)
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71
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72 def get_language(self, obj):
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73 return self._get(obj, LANG)
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74
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75 def get_value(self, obj):
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76 return self._get(obj, VALUE)
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77
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78 def get_graph(self, obj):
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79 return self._get(obj, GRAPH)
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80
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81 def get_list(self, obj):
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82 return self._get(obj, LIST)
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83
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84 def get_set(self, obj):
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85 return self._get(obj, SET)
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86
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87 def get_rev(self, obj):
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88 return self._get(obj, REV)
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89
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90 def _get(self, obj, key):
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91 return obj.get(self._alias.get(key)) or obj.get(key)
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92
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93 def get_key(self, key):
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94 return self._alias.get(key, key)
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95
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96 lang_key = property(lambda self: self.get_key(LANG))
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97 id_key = property(lambda self: self.get_key(ID))
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98 type_key = property(lambda self: self.get_key(TYPE))
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99 value_key = property(lambda self: self.get_key(VALUE))
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100 list_key = property(lambda self: self.get_key(LIST))
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101 rev_key = property(lambda self: self.get_key(REV))
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102 graph_key = property(lambda self: self.get_key(GRAPH))
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103
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104 def add_term(self, name, idref, coercion=UNDEF, container=UNDEF,
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105 language=UNDEF, reverse=False):
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106 term = Term(idref, name, coercion, container, language, reverse)
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107 self.terms[name] = term
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108 self._lookup[(idref, coercion or language, container, reverse)] = term
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109 self._prefixes[idref] = name
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110
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111 def find_term(self, idref, coercion=None, container=UNDEF,
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112 language=None, reverse=False):
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113 lu = self._lookup
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114 if coercion is None:
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115 coercion = language
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116 if coercion is not UNDEF and container:
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117 found = lu.get((idref, coercion, container, reverse))
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118 if found: return found
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119 if coercion is not UNDEF:
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120 found = lu.get((idref, coercion, UNDEF, reverse))
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121 if found: return found
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122 if container:
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123 found = lu.get((idref, coercion, container, reverse))
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124 if found: return found
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125 elif language:
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126 found = lu.get((idref, UNDEF, LANG, reverse))
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127 if found: return found
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128 else:
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129 found = lu.get((idref, coercion or UNDEF, SET, reverse))
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130 if found: return found
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131 return lu.get((idref, UNDEF, UNDEF, reverse))
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132
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133 def resolve(self, curie_or_iri):
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134 iri = self.expand(curie_or_iri, False)
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135 if self.isblank(iri):
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136 return iri
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137 return self.resolve_iri(iri)
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138
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139 def resolve_iri(self, iri):
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140 return norm_url(self._base, iri)
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141
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142 def isblank(self, ref):
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143 return ref.startswith('_:')
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144
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145 def expand(self, term_curie_or_iri, use_vocab=True):
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146 if use_vocab:
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147 term = self.terms.get(term_curie_or_iri)
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148 if term:
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149 return term.id
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150 is_term, pfx, local = self._prep_expand(term_curie_or_iri)
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151 if pfx == '_':
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152 return term_curie_or_iri
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153 if pfx is not None:
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154 ns = self.terms.get(pfx)
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155 if ns and ns.id:
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156 return ns.id + local
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157 elif is_term and use_vocab:
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158 if self.vocab:
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159 return self.vocab + term_curie_or_iri
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160 return None
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161 return self.resolve_iri(term_curie_or_iri)
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162
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163 def shrink_iri(self, iri):
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164 ns, name = split_iri(str(iri))
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165 pfx = self._prefixes.get(ns)
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166 if pfx:
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167 return ":".join((pfx, name))
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168 elif self._base:
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169 if str(iri) == self._base:
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170 return ""
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171 elif iri.startswith(self._basedomain):
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172 return iri[len(self._basedomain):]
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173 return iri
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174
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175 def to_symbol(self, iri):
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176 iri = str(iri)
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177 term = self.find_term(iri)
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178 if term:
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179 return term.name
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180 ns, name = split_iri(iri)
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181 if ns == self.vocab:
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182 return name
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183 pfx = self._prefixes.get(ns)
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184 if pfx:
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185 return ":".join((pfx, name))
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186 return iri
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187
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188 def load(self, source, base=None):
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189 self.active = True
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190 sources = []
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191 source = source if isinstance(source, list) else [source]
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192 self._prep_sources(base, source, sources)
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193 for source_url, source in sources:
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194 self._read_source(source, source_url)
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195
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196 def _prep_sources(self, base, inputs, sources, referenced_contexts=None,
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197 in_source_url=None):
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198 referenced_contexts = referenced_contexts or set()
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199 for source in inputs:
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200 if isinstance(source, str):
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201 source_url = urljoin(base, source)
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202 if source_url in referenced_contexts:
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203 raise errors.RECURSIVE_CONTEXT_INCLUSION
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204 referenced_contexts.add(source_url)
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205 source = source_to_json(source_url)
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206 if CONTEXT not in source:
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207 raise errors.INVALID_REMOTE_CONTEXT
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208 else:
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209 source_url = in_source_url
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210
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211 if isinstance(source, dict):
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212 if CONTEXT in source:
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213 source = source[CONTEXT]
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214 source = source if isinstance(source, list) else [source]
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215 if isinstance(source, list):
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216 self._prep_sources(base, source, sources, referenced_contexts, source_url)
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217 else:
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218 sources.append((source_url, source))
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219
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220 def _read_source(self, source, source_url=None):
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221 self.vocab = source.get(VOCAB, self.vocab)
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222 for key, value in list(source.items()):
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223 if key == LANG:
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224 self.language = value
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parents:
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225 elif key == VOCAB:
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226 continue
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227 elif key == BASE:
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228 if source_url:
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229 continue
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230 self.base = value
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231 else:
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232 self._read_term(source, key, value)
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233
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234 def _read_term(self, source, name, dfn):
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235 if isinstance(dfn, dict):
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236 #term = self._create_term(source, key, value)
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237 rev = dfn.get(REV)
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238 idref = rev or dfn.get(ID, UNDEF)
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239 if idref == TYPE:
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240 idref = str(RDF.type)
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241 elif idref is not UNDEF:
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242 idref = self._rec_expand(source, idref)
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243 elif ':' in name:
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244 idref = self._rec_expand(source, name)
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245 elif self.vocab:
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246 idref = self.vocab + name
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247 coercion = dfn.get(TYPE, UNDEF)
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248 if coercion and coercion not in (ID, TYPE, VOCAB):
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249 coercion = self._rec_expand(source, coercion)
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250 self.add_term(name, idref, coercion,
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251 dfn.get(CONTAINER, UNDEF), dfn.get(LANG, UNDEF), bool(rev))
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252 else:
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253 idref = self._rec_expand(source, dfn)
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254 self.add_term(name, idref)
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255 if idref in NODE_KEYS:
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256 self._alias[idref] = name
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257
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258 def _rec_expand(self, source, expr, prev=None):
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259 if expr == prev or expr in NODE_KEYS:
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260 return expr
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261 is_term, pfx, nxt = self._prep_expand(expr)
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262 if pfx:
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263 iri = self._get_source_id(source, pfx) or self.expand(pfx)
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264 if iri is None:
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265 nxt = expr
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266 else:
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267 nxt = iri + nxt
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268 else:
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269 nxt = self._get_source_id(source, nxt) or nxt
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270 if ':' not in nxt and self.vocab:
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271 return self.vocab + nxt
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272 return self._rec_expand(source, nxt, expr)
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273
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274 def _prep_expand(self, expr):
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275 if ':' not in expr:
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276 return True, None, expr
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277 pfx, local = expr.split(':', 1)
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278 if not local.startswith('//'):
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279 return False, pfx, local
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280 else:
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281 return False, None, expr
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282
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283 def _get_source_id(self, source, key):
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284 # .. from source dict or if already defined
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285 term = source.get(key)
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286 if term is None:
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287 dfn = self.terms.get(key)
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288 if dfn:
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289 term = dfn.id
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290 elif isinstance(term, dict):
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291 term = term.get(ID)
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292 return term
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293
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294
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295 Term = namedtuple('Term',
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296 'id, name, type, container, language, reverse')
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297 Term.__new__.__defaults__ = (UNDEF, UNDEF, UNDEF, False)