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annotate service/mqtt_to_rdf/candidate_binding.py @ 1667:a2347393b43e

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comments, debug, dead code
author drewp@bigasterisk.com
date Tue, 21 Sep 2021 22:19:11 -0700
parents 1a7c1261302c
children 3cf7f313b285
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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diff changeset
1 import logging
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2 from dataclasses import dataclass
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3 from typing import Dict, Iterator
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4
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5 from prometheus_client import Summary
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6 from rdflib import BNode, Graph
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7 from rdflib.term import Node, Variable
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8
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9 from inference_types import BindableTerm, BindingUnknown, Triple
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10
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11 log = logging.getLogger('cbind')
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12 INDENT = ' '
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13
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14
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15 class BindingConflict(ValueError): # might be the same as `Inconsistent`
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16 pass
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18
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19 @dataclass
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20 class CandidateBinding:
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21 binding: Dict[BindableTerm, Node]
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22
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23 def __repr__(self):
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24 b = " ".join("%r=%r" % (var, value) for var, value in sorted(self.binding.items()))
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25 return f'CandidateBinding({b})'
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26
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27 def apply(self, g: Graph, returnBoundStatementsOnly=True) -> Iterator[Triple]:
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28 for stmt in g:
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29 try:
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30 bound = (
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31 self.applyTerm(stmt[0], returnBoundStatementsOnly), #
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32 self.applyTerm(stmt[1], returnBoundStatementsOnly), #
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33 self.applyTerm(stmt[2], returnBoundStatementsOnly))
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34 except BindingUnknown:
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35 if log.isEnabledFor(logging.DEBUG):
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36 log.debug(f'{INDENT*7} CB.apply cant bind {stmt} using {self.binding}')
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37
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38 continue
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39 if log.isEnabledFor(logging.DEBUG):
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40 log.debug(f'{INDENT*7} CB.apply took {stmt} to {bound}')
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42 yield bound
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43
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44 def applyTerm(self, term: Node, failUnbound=True):
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45 if isinstance(term, (Variable, BNode)):
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46 if term in self.binding:
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47 return self.binding[term]
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48 else:
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49 if failUnbound:
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50 raise BindingUnknown()
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51 return term
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52
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53 def addNewBindings(self, newBindings: 'CandidateBinding'):
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54 for k, v in newBindings.binding.items():
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55 if k in self.binding and self.binding[k] != v:
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56 raise BindingConflict(f'thought {k} would be {self.binding[k]} but another Evaluation said it should be {v}')
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57 self.binding[k] = v
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58
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59 def copy(self):
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60 return CandidateBinding(self.binding.copy())
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61
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62 def contains(self, term: BindableTerm):
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63 return term in self.binding