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annotate service/mqtt_to_rdf/inference_functions.py @ 1695:5c2565e63297

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take out some misduided fixes
author drewp@bigasterisk.com
date Mon, 27 Sep 2021 22:55:32 -0700
parents 7a61113fd17d
children
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1 """
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2 Some of these are from https://www.w3.org/2000/10/swap/doc/CwmBuiltins
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3 """
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4 import urllib.parse
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5 from decimal import Decimal
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6 from typing import Optional, cast
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7
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8 from rdflib import Literal, Namespace, URIRef
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9
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10 from candidate_binding import CandidateBinding
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11 from lhs_evaluation import (ListFunction, SubjectFunction, SubjectObjectFunction, register)
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12
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13 MATH = Namespace('http://www.w3.org/2000/10/swap/math#')
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14 ROOM = Namespace("http://projects.bigasterisk.com/room/")
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15
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16
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17 @register
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18 class Gt(SubjectObjectFunction):
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19 pred = MATH['greaterThan']
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20
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21 def bind(self, existingBinding: CandidateBinding) -> Optional[CandidateBinding]:
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22 [x, y] = self.getNumericOperands(existingBinding)
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23 if x > y:
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24 return CandidateBinding({}) # no new values; just allow matching to keep going
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25
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26
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27 @register
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28 class AsFarenheit(SubjectFunction):
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29 pred = ROOM['asFarenheit']
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30
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31 def bind(self, existingBinding: CandidateBinding) -> Optional[CandidateBinding]:
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32 [x] = self.getNumericOperands(existingBinding)
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33 f = cast(Literal, Literal(Decimal(x) * 9 / 5 + 32))
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34 return self.valueInObjectTerm(f)
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35
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36
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37 @register
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38 class Sum(ListFunction):
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39 pred = MATH['sum']
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40
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41 def bind(self, existingBinding: CandidateBinding) -> Optional[CandidateBinding]:
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42 f = Literal(sum(self.getNumericOperands(existingBinding)))
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43 return self.valueInObjectTerm(f)
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46 @register
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47 class ChildResource(ListFunction):
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48 pred = ROOM['childResource']
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49
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50 def bind(self, existingBinding: CandidateBinding) -> Optional[CandidateBinding]:
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51 ops = self.getOperandNodes(existingBinding)
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52 if len(ops) != 2 or not isinstance(ops[0], URIRef) or not isinstance(ops[1], Literal):
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53 raise ValueError(f'expected (?baseUri ?nextSegmentString) as subject to {self}')
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54 newUri = URIRef(ops[0].rstrip('/') + '/' + urllib.parse.quote(ops[1].toPython(), safe=''))
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55 return self.valueInObjectTerm(newUri)