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annotate service/mqtt_to_rdf/stmt_chunk.py @ 1654:d47832373b34

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__nonzero__ is called __bool__ in py3! thanks for nothing, linters
author drewp@bigasterisk.com
date Sun, 19 Sep 2021 13:21:15 -0700
parents e7d594c065d4
children 15e84c71beee
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1 import itertools
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2 import logging
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3 from dataclasses import dataclass
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4 from typing import Iterable, Iterator, List, Optional, Set, cast
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5
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6 from rdflib.graph import Graph
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7 from rdflib.term import BNode, Literal, Node, URIRef, Variable
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8
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9 from candidate_binding import CandidateBinding
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10 from inference_types import BindingUnknown, Inconsistent, Triple
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11 from rdf_debug import graphDump
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12
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13 log = logging.getLogger('infer')
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14
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15 INDENT = ' '
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16
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17
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18 @dataclass
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19 class Chunk: # rename this
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20 """a statement, maybe with variables in it, except *the object can be an rdf list*.
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21 This is done to optimize list comparisons (a lot) at the very minor expense of not
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22 handling certain exotic cases, such as a branching list.
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23
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24 Also the subject could be a list, e.g. for (?x ?y) math:sum ?z .
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25
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26 Also a function call in a rule is always contained in exactly one chunk.
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27 """
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28 # all immutable
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29 primary: Triple
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30 subjList: Optional[List[Node]] = None
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31 objList: Optional[List[Node]] = None
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32
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33 def __post_init__(self):
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34 self.predicate = self.primary[1]
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35 self.sortKey = (self.primary, tuple(self.subjList or []), tuple(self.objList or []))
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36
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37 def __hash__(self):
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38 return hash(self.sortKey)
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39
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40 def __gt__(self, other):
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41 return self.sortKey > other.sortKey
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42
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43 @classmethod
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44 def splitGraphIntoChunks(cls, graph: Graph) -> Iterator['Chunk']:
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45 for stmt in graph:
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46 yield cls(primary=stmt, subjList=None, objList=None)
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47
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48 def totalBindingIfThisStmtWereTrue(self, prevBindings: CandidateBinding, proposed: 'Chunk') -> CandidateBinding:
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49 outBinding = prevBindings.copy()
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50 for rt, ct in zip(self.primary, proposed.primary):
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51 if isinstance(rt, (Variable, BNode)):
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52 if outBinding.contains(rt) and outBinding.applyTerm(rt) != ct:
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53 msg = f'{rt=} {ct=} {outBinding=}' if log.isEnabledFor(logging.DEBUG) else ''
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54 raise Inconsistent(msg)
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55 outBinding.addNewBindings(CandidateBinding({rt: ct}))
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56 return outBinding
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57
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58 def myMatches(self, g: 'ChunkedGraph') -> List['Chunk']:
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59 """Chunks from g where self, which may have BindableTerm wildcards, could match that chunk in g."""
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60 out: List['Chunk'] = []
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61 log.debug(f'{INDENT*6} {self}.myMatches({g}')
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62 for ch in g.allChunks():
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63 if self.matches(ch):
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64 out.append(ch)
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65 #out.sort() # probably leftover- remove?
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66 return out
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67
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68 # could combine this and totalBindingIf into a single ChunkMatch object
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69 def matches(self, other: 'Chunk') -> bool:
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70 """does this Chunk with potential BindableTerm wildcards match other?"""
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71 for selfTerm, otherTerm in zip(self.primary, other.primary):
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72 if not isinstance(selfTerm, (Variable, BNode)) and selfTerm != otherTerm:
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73 return False
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74 return True
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75
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76 def __repr__(self):
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77 return graphDump([self.primary]) + (''.join('+%s' % obj for obj in self.objList) if self.objList else '')
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78
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79 def isFunctionCall(self, functionsFor) -> bool:
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80 return bool(list(functionsFor(cast(URIRef, self.predicate))))
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81
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82 def isStatic(self) -> bool:
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83 return (_stmtIsStatic(self.primary) and all(_termIsStatic(s) for s in (self.subjList or [])) and
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84 all(_termIsStatic(s) for s in (self.objList or [])))
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85
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86
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87 def _stmtIsStatic(stmt: Triple) -> bool:
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88 return all(_termIsStatic(t) for t in stmt)
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89
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90
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91 def _termIsStatic(term: Node) -> bool:
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92 return isinstance(term, (URIRef, Literal))
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93
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94
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95 def applyChunky(cb: CandidateBinding, g: Iterable[Chunk], returnBoundStatementsOnly=True) -> Iterator[Chunk]:
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96 for stmt in g:
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97 try:
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98 bound = Chunk(
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99 (
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100 cb.applyTerm(stmt.primary[0], returnBoundStatementsOnly), #
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101 cb.applyTerm(stmt.primary[1], returnBoundStatementsOnly), #
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102 cb.applyTerm(stmt.primary[2], returnBoundStatementsOnly)),
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103 subjList=None,
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104 objList=None)
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105 except BindingUnknown:
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106 log.debug(f'{INDENT*7} CB.apply cant bind {stmt} using {cb.binding}')
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107
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108 continue
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109 log.debug(f'{INDENT*7} CB.apply took {stmt} to {bound}')
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110
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111 yield bound
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112
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113
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114 class ChunkedGraph:
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115 """a Graph converts 1-to-1 with a ChunkedGraph, where the Chunks have
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116 combined some statements together. (The only exception is that bnodes for
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117 rdf lists are lost)"""
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118
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119 def __init__(
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120 self,
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121 graph: Graph,
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122 functionsFor # get rid of this- i'm just working around a circular import
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123 ):
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124 self.chunksUsedByFuncs: Set[Chunk] = set()
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125 self.staticChunks: Set[Chunk] = set()
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126 self.patternChunks: Set[Chunk] = set()
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127 for c in Chunk.splitGraphIntoChunks(graph):
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128 if c.isFunctionCall(functionsFor):
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129 self.chunksUsedByFuncs.add(c)
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130 elif c.isStatic():
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131 self.staticChunks.add(c)
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132 else:
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133 self.patternChunks.add(c)
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134
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135 def allPredicatesExceptFunctions(self) -> Set[Node]:
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136 return set(ch.predicate for ch in itertools.chain(self.staticChunks, self.patternChunks))
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137
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138 def noPredicatesAppear(self, preds: Iterable[Node]) -> bool:
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139 return self.allPredicatesExceptFunctions().isdisjoint(preds)
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140
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d47832373b34 __nonzero__ is called __bool__ in py3! thanks for nothing, linters
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141 def __bool__(self):
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142 return bool(self.chunksUsedByFuncs) or bool(self.staticChunks) or bool(self.patternChunks)
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143
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144 def __repr__(self):
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145 return f'ChunkedGraph({self.__dict__})'
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146
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147 def allChunks(self) -> Iterable[Chunk]:
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148 yield from itertools.chain(self.staticChunks, self.patternChunks, self.chunksUsedByFuncs)
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149
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150 def value(self, subj, pred) -> Node: # throwaway
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151 for s in self.allChunks():
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152 s = s.primary
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153 if (s[0], s[1]) == (subj, pred):
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154 return s[2]
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155 raise ValueError("value not found")
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156
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157 def __contains__(self, ch: Chunk) -> bool:
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158 return ch in self.allChunks()