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annotate planemo/lib/python3.7/site-packages/rdflib/plugins/parsers/hturtle.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 # -*- coding: utf-8 -*-
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2 """
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3 Extraction parser RDF embedded verbatim into HTML or XML files. This is based
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4 on:
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5
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6 * The specification on embedding turtle into html:
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7 http://www.w3.org/TR/turtle/#in-html
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8
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9 For SVG (and currently SVG only) the method also extracts an embedded RDF/XML
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10 data, per SVG specification
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11
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12 License: W3C Software License,
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13 http://www.w3.org/Consortium/Legal/copyright-software
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14 Author: Ivan Herman
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15 Copyright: W3C
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16 """
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17
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18 from rdflib.parser import Parser
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19 from .pyRdfa import pyRdfa, Options
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20 from .pyRdfa.state import ExecutionContext
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21 from .pyRdfa.embeddedRDF import handle_embeddedRDF
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22 from .structureddata import _get_orig_source, _check_error
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23
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24 try:
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25 import html5lib
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26 assert html5lib
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27 html5lib = True
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28 except ImportError:
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29 import warnings
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30 warnings.warn(
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31 'html5lib not found! RDFa and Microdata parsers ' +
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32 'will not be available.')
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33 html5lib = False
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34
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35
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36 class HTurtle(pyRdfa):
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37 """
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38 Bastardizing the RDFa 1.1 parser to do a hturtle extractions
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39 """
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40 def __init__(self, options=None, base="", media_type=""):
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41 pyRdfa.__init__(self, options=options, base=base,
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42 media_type=media_type, rdfa_version="1.1")
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43
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44 def graph_from_DOM(self, dom, graph, pgraph=None):
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45 """
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46 Stealing the parsing function from the original class, to do
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47 turtle extraction only
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48 """
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49
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50 def copyGraph(tog, fromg):
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51 for t in fromg:
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52 tog.add(t)
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53 for k, ns in fromg.namespaces():
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54 tog.bind(k, ns)
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55
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56 def _process_one_node(node, graph, state):
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57 if handle_embeddedRDF(node, graph, state):
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58 # we got an RDF content that has been extracted into Graph;
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59 # the recursion should stop
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60 return
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61 else:
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62 # recurse through all the child elements of the current node
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63 for n in node.childNodes:
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64 if n.nodeType == node.ELEMENT_NODE:
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65 _process_one_node(n, graph, state)
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66
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67 topElement = dom.documentElement
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68 state = ExecutionContext(topElement, graph, base=self.base,
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69 options=self.options, rdfa_version="1.1")
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70 _process_one_node(topElement, graph, state)
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71 if pgraph is not None:
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72 copyGraph(pgraph, self.options.processor_graph.graph)
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73
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74 # This is the parser interface as it would look when called from the rest of
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75 # RDFLib
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76
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77
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78 class HTurtleParser(Parser):
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79 def parse(self, source, graph, pgraph=None, media_type=""):
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80 """
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81 @param source: one of the input sources that the RDFLib package defined
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82 @type source: InputSource class instance
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83 @param graph: target graph for the triples; output graph, in RDFa spec.
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84 parlance
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85 @type graph: RDFLib Graph
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86 @keyword media_type: explicit setting of the preferred media type
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87 (a.k.a. content type) of the the RDFa source. None means the content
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88 type of the HTTP result is used, or a guess is made based on the
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89 suffix of a file
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90 @type media_type: string
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91 """
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92 if html5lib is False:
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93 raise ImportError(
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94 'html5lib is not installed, cannot ' +
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95 'use RDFa and Microdata parsers.')
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96
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97 (baseURI, orig_source) = _get_orig_source(source)
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98 self._process(
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99 graph, pgraph, baseURI, orig_source, media_type=media_type)
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100
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101 def _process(self, graph, baseURI, orig_source, media_type=""):
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102 self.options = Options(output_processor_graph=None,
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103 embedded_rdf=True,
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104 vocab_expansion=False,
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105 vocab_cache=False)
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106
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107 if media_type is None:
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108 media_type = ""
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109 processor = HTurtle(
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110 self.options, base=baseURI, media_type=media_type)
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111 processor.graph_from_source(
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112 orig_source, graph=graph, pgraph=None, rdfOutput=False)
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113 # get possible error triples to raise exceptions
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114 _check_error(graph)