class RDF::N3::Algebra::List::Member
Iff the subject is a list and the object is in that list, then this is true.
Constants
- NAME
- URI
Public Instance Methods
execute(queryable, solutions:, **options)
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Evaluates this operator using the given variable ‘bindings`. If the last operand is a variable, it creates a solution for each element in the list.
@param [RDF::Queryable] queryable
the graph or repository to query
@param [RDF::Query::Solutions] solutions
solutions for chained queries
@return [RDF::Query::Solutions]
# File lib/rdf/n3/algebra/list/member.rb, line 17 def execute(queryable, solutions:, **options) RDF::Query::Solutions(solutions.map do |solution| list = operand(0).evaluate(solution.bindings, formulae: formulae) next unless list list = RDF::N3::List.try_list(list, queryable).evaluate(solution.bindings, formulae: formulae) object = operand(1).evaluate(solution.bindings, formulae: formulae) || operand(1) object = formulae[object].deep_dup if object.node? && formulae.has_key?(object) log_debug(NAME) {"list: #{list.to_sxp}, object: #{object.to_sxp}"} unless list.list? && list.valid? log_error(NAME) {"operand is not a list: #{list.to_sxp}"} next end if object.variable? # Bind all list entries to this solution, creates an array of solutions list.to_a.map do |term| solution.merge(object.to_sym => term) end elsif list.to_a.include?(object) solution else nil end end.flatten.compact.uniq) end