Mercurial > repos > shellac > guppy_basecaller

annotate env/lib/python3.7/site-packages/rdflib/plugins/sparql/evalutils.py @ 4:79f47841a781 draft

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
"planemo upload commit 2a0fe2cc28b09e101d37293e53e82f61762262ec"
author shellac
date Thu, 14 May 2020 16:47:39 -0400
parents 26e78fe6e8c4
children
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0
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1 import collections
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2
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3 from rdflib.term import Variable, Literal, BNode, URIRef
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4
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5 from rdflib.plugins.sparql.operators import EBV
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6 from rdflib.plugins.sparql.parserutils import Expr, CompValue, value
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7 from rdflib.plugins.sparql.sparql import SPARQLError, NotBoundError
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8
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9
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10 def _diff(a, b, expr):
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11 res = set()
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12
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13 for x in a:
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14 if all(not x.compatible(y) or not _ebv(expr, x.merge(y)) for y in b):
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15 res.add(x)
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16
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17 return res
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18
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19
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20 def _minus(a, b):
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21 for x in a:
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22 if all((not x.compatible(y)) or x.disjointDomain(y) for y in b):
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23 yield x
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24
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26
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27 def _join(a, b):
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28 for x in a:
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29 for y in b:
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30 if x.compatible(y):
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31 yield x.merge(y)
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32
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33
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34 def _ebv(expr, ctx):
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35
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36 """
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37 Return true/false for the given expr
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38 Either the expr is itself true/false
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39 or evaluates to something, with the given ctx
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40
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41 an error is false
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42 """
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43
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44 try:
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45 return EBV(expr)
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46 except SPARQLError:
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47 pass
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48 if isinstance(expr, Expr):
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49 try:
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50 return EBV(expr.eval(ctx))
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51 except SPARQLError:
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52 return False # filter error == False
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53 elif isinstance(expr, CompValue):
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54 raise Exception(
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55 "Weird - filter got a CompValue without evalfn! %r" % expr)
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56 elif isinstance(expr, Variable):
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57 try:
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58 return EBV(ctx[expr])
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59 except:
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60 return False
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61 return False
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62
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63
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64 def _eval(expr, ctx, raise_not_bound_error=True):
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65 if isinstance(expr, (Literal, URIRef)):
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66 return expr
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67 if isinstance(expr, Expr):
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68 return expr.eval(ctx)
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69 elif isinstance(expr, Variable):
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70 try:
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71 return ctx[expr]
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72 except KeyError:
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73 if raise_not_bound_error:
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74 raise NotBoundError("Variable %s is not bound" % expr)
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75 else:
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76 return None
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77 elif isinstance(expr, CompValue):
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78 raise Exception(
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79 "Weird - _eval got a CompValue without evalfn! %r" % expr)
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80 else:
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81 raise Exception("Cannot eval thing: %s (%s)" % (expr, type(expr)))
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82
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83
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84 def _filter(a, expr):
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85 for c in a:
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86 if _ebv(expr, c):
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87 yield c
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88
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89
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90 def _fillTemplate(template, solution):
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91
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92 """
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93 For construct/deleteWhere and friends
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94
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95 Fill a triple template with instantiated variables
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96 """
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97
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98 bnodeMap = collections.defaultdict(BNode)
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99 for t in template:
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100 s, p, o = t
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101
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102 _s = solution.get(s)
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103 _p = solution.get(p)
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104 _o = solution.get(o)
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105
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106 # instantiate new bnodes for each solution
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107 _s, _p, _o = [bnodeMap[x] if isinstance(
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108 x, BNode) else y for x, y in zip(t, (_s, _p, _o))]
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109
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110 if _s is not None and \
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111 _p is not None and \
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112 _o is not None:
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113
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114 yield (_s, _p, _o)
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115
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116 def _val(v):
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117 """ utilitity for ordering things"""
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118 if isinstance(v, Variable):
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119 return (0, v)
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120 elif isinstance(v, BNode):
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121 return (1, v)
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122 elif isinstance(v, URIRef):
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123 return (2, v)
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124 elif isinstance(v, Literal):
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125 return (3, v)