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module SPARQL; module Algebra
class Operator
##
# The SPARQL Property Path `path*` (ZeroOrMorePath) operator.
#
# @example
# (path* :p)
#
# @see http://www.w3.org/TR/sparql11-query/#defn_evalPP_ZeroOrMorePath
class PathStar < Operator::Unary
include Query
NAME = :"path*"
##
# Path including zero length:
#
# (path :a (path* :p) :b)
# => (path :a (path? (path+ :p)) :b)
#
# @param [RDF::Queryable] queryable
# the graph or repository to query
# @param [Hash{Symbol => Object}] options
# any additional keyword options
# @option options [RDF::Term, RDF::Variable] :subject
# @option options [RDF::Term, RDF::Variable] :object
# @yield [solution]
# each matching solution
# @yieldparam [RDF::Query::Solution] solution
# @yieldreturn [void] ignored
# @see http://www.w3.org/TR/sparql11-query/#sparqlAlgebra
def execute(queryable, options = {}, &block)
subject, object = options[:subject], options[:object]
debug(options) {"Path* #{[subject, operands, object].to_sse}"}
# (:x :p* :y) => (:x (:p+)? :y)
query = PathOpt.new(PathPlus.new(*operands))
query.execute(queryable, options.merge(depth: options[:depth].to_i + 1), &block)
end
end # PathStar
end # Operator
end; end # SPARQL::Algebra
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10 entries across 10 versions & 1 rubygems