Class: RDF::N3::Algebra::Log::Implies
 Inherits:

SPARQL::Algebra::Operator::Binary
 Object
 SPARQL::Algebra::Operator
 SPARQL::Algebra::Operator::Binary
 RDF::N3::Algebra::Log::Implies
 Includes:
 Builtin, SPARQL::Algebra::Query, SPARQL::Algebra::Update
 Defined in:
 vendor/bundler/ruby/3.3.0/bundler/gems/rdfn3a6ef81a7e1ce/lib/rdf/n3/algebra/log/implies.rb
Overview
Logical implication.
This is the relation between the antecedent (subject) and conclusion (object) of a rule. The application of a rule to a knowledgebase is as follows. For every substitution which, applied to the antecedent, gives a formula which is a subset of the knowledgebase, then the result of applying that same substitution to the conclusion may be added to the knowledgebase.
related: See log:conclusion.
Constant Summary collapse
Constants included from Util::Logger
Constants inherited from SPARQL::Algebra::Operator::Binary
SPARQL::Algebra::Operator::Binary::ARITY
Constants inherited from SPARQL::Algebra::Operator
SPARQL::Algebra::Operator::ARITY, SPARQL::Algebra::Operator::IsURI
Constants included from SPARQL::Algebra::Expression
SPARQL::Algebra::Expression::PATTERN_PARENTS
Instance Attribute Summary
Attributes included from Enumerable
Attributes included from SPARQL::Algebra::Query
Attributes inherited from SPARQL::Algebra::Operator
Instance Method Summary collapse

#clear_solutions ⇒ Object
Clear out any cached solutions.

#each(solutions: RDF::Query::Solutions()) {statement ... } ⇒ Object
Yields statements from the object based on solutions determined from the subject.

#execute(queryable, solutions:, **options) ⇒ RDF::Solutions
Returns solutions from subject.

#graph_name ⇒ RDF::Resource
Graph name associated with this operation, using the name of the parent.
Methods included from Builtin
#evaluate, #hash, #input_operand, #rank, #to_uri
Methods included from Util::Logger
#log_debug, #log_depth, #log_error, #log_fatal, #log_info, #log_recover, #log_recovering?, #log_statistics, #log_warn, #logger
Methods included from Enumerable
add_entailment, #canonicalize, #canonicalize!, #dump, #each_graph, #each_object, #each_predicate, #each_quad, #each_statement, #each_subject, #each_term, #each_triple, #entail, #enum_graph, #enum_object, #enum_predicate, #enum_quad, #enum_statement, #enum_subject, #enum_term, #enum_triple, #graph?, #graph_names, #invalid?, #method_missing, #object?, #objects, #predicate?, #predicates, #project_graph, #quad?, #quads, #respond_to_missing?, #statement?, #statements, #subject?, #subjects, #supports?, #term?, #terms, #to_a, #to_h, #to_set, #triple?, #triples, #valid?, #validate!
Methods included from Util::Aliasing::LateBound
Methods included from Isomorphic
#bijection_to, #isomorphic_with?
Methods included from Countable
Methods included from SPARQL::Algebra::Update
#graph_name=, #unshift, #variables
Methods included from SPARQL::Algebra::Query
#each_solution, #empty?, #failed?, #graph_name=, #matched?, #query_yields_boolean?, #query_yields_solutions?, #query_yields_statements?, #unshift, #variables
Methods inherited from SPARQL::Algebra::Operator::Binary
Methods inherited from SPARQL::Algebra::Operator
#aggregate?, arity, base_uri, #base_uri, base_uri=, #bind, #boolean, #constant?, #deep_dup, #each_descendant, #eql?, #evaluatable?, evaluate, #executable?, #first_ancestor, for, #formulae, #initialize, #inspect, #ndvars, #node?, #operand, #optimize, #optimize!, #parent, #parent=, prefixes, #prefixes, prefixes=, #rewrite, #to_binary, #to_sparql, to_sparql, #to_sxp, #to_sxp_bin, #validate!, #variable?, #variables, #vars
Methods included from SPARQL::Algebra::Expression
cast, #constant?, #evaluate, extension, extension?, extensions, for, #invalid?, new, #node?, open, #optimize, #optimize!, parse, register_extension, #to_sxp_bin, #valid?, #validate!, #variable?
Constructor Details
This class inherits a constructor from SPARQL::Algebra::Operator::Binary
Dynamic Method Handling
This class handles dynamic methods through the method_missing method in the class RDF::Enumerable
Instance Method Details
#clear_solutions ⇒ Object
Clear out any cached solutions. This principaly is for log:conclusions
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# File 'vendor/bundler/ruby/3.3.0/bundler/gems/rdfn3a6ef81a7e1ce/lib/rdf/n3/algebra/log/implies.rb', line 63 def clear_solutions super @solutions = nil end 
#each(solutions: RDF::Query::Solutions()) {statement ... } ⇒ Object
Yields statements from the object based on solutions determined from the subject. Each solution formed by querying queryable
from the subject is used to create a graph, which must be a subgraph of queryable
. If so, that solution is used to generate triples from the object formula which are yielded.
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# File 'vendor/bundler/ruby/3.3.0/bundler/gems/rdfn3a6ef81a7e1ce/lib/rdf/n3/algebra/log/implies.rb', line 75 def each(solutions: RDF::Query::Solutions(), &block) # Merge solutions in with those for the evaluation of this implication # Clear out solutions so they don't get remembered erroneously. solutions, @solutions = Array(@solutions), nil log_depth do super(solutions: RDF::Query::Solutions(RDF::Query::Solution.new), &block) solutions.each do solution log_info("(logImplies each) solution") {SXP::Generator.string solution.to_sxp_bin} object = operand(1).evaluate(solution.bindings, formulae: formulae) log_info("(logImplies each) object") {SXP::Generator.string object.to_sxp_bin} # Yield inferred statements log_depth do object.each(solutions: RDF::Query::Solutions(solution)) do statement log_debug(("(logImplies each) infer\s")) {statement.to_sxp} block.call(RDF::Statement.from(statement.to_quad, inferred: true)) end end end end end 
#execute(queryable, solutions:, **options) ⇒ RDF::Solutions
Returns solutions from subject. Solutions are created by evaluating subject against queryable
.
Solutions are kept within this instance, and used for conclusions. Note that the evaluated solutions do not affect that of the invoking formula, as the solution spaces are disjoint.
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# File 'vendor/bundler/ruby/3.3.0/bundler/gems/rdfn3a6ef81a7e1ce/lib/rdf/n3/algebra/log/implies.rb', line 28 def execute(queryable, solutions:, **) @queryable = queryable @solutions = RDF::Query::Solutions(solutions.map do solution log_debug(NAME, "solution") {SXP::Generator.string(solution.to_sxp_bin)} subject = operand(0).evaluate(solution.bindings, formulae: formulae) object = operand(1).evaluate(solution.bindings, formulae: formulae) log_info(NAME, "subject") {SXP::Generator.string(subject.to_sxp_bin)} log_info(NAME, "object") {SXP::Generator.string(object.to_sxp_bin)} # Nothing to do if variables aren't resolved. next unless subject && object solns = log_depth {subject.execute(queryable, solutions: RDF::Query::Solutions(solution), **)} # Execute object as well (typically used for log:outputString) solns.each do soln log_depth {object.execute(queryable, solutions: RDF::Query::Solutions(soln), **)} end # filter solutions where not all variables in antecedant are bound. vars = subject.universal_vars solns = RDF::Query::Solutions(solns.to_a.select do soln vars.all? {v soln.bound?(v)} end) solns end.flatten.compact.uniq) log_info(NAME) {SXP::Generator.string(@solutions.to_sxp_bin)} # Return original solutions, without bindings solutions end 
#graph_name ⇒ RDF::Resource
Graph name associated with this operation, using the name of the parent
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# File 'vendor/bundler/ruby/3.3.0/bundler/gems/rdfn3a6ef81a7e1ce/lib/rdf/n3/algebra/log/implies.rb', line 100 def graph_name; parent.graph_name; end 