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module SPARQL; module Algebra
class Operator
##
# The SPARQL GraphPattern `exprlist` operator.
#
# Used for filters with more than one expression.
#
# [72] ExpressionList ::= NIL | '(' Expression ( ',' Expression )* ')'
#
# @example SPARQL Grammar
# PREFIX : <http://example.org/>
#
# SELECT ?v ?w
# {
# FILTER (?v = 2)
# FILTER (?w = 3)
# ?s :p ?v .
# ?s :q ?w .
# }
#
# @example SSE
# (prefix ((: <http://example.org/>))
# (project (?v ?w)
# (filter (exprlist (= ?v 2) (= ?w 3))
# (bgp
# (triple ?s :p ?v)
# (triple ?s :q ?w)
# ))))
#
# @see https://www.w3.org/TR/sparql11-query/#evaluation
class Exprlist < Operator
include Evaluatable
NAME = [:exprlist]
##
# Returns `true` if all operands evaluate to `true`.
#
# Note that this operator operates on the effective boolean value
# (EBV) of its operands.
#
# @example
#
# (exprlist (= 1 1) (!= 1 0))
#
# @param [RDF::Query::Solution] bindings
# a query solution containing zero or more variable bindings
# @param [Hash{Symbol => Object}] options ({})
# options passed from query
# @return [RDF::Literal::Boolean] `true` or `false`
# @raise [TypeError] if the operands could not be coerced to a boolean literal
def evaluate(bindings, **options)
res = operands.all? {|op| boolean(op.evaluate(bindings, **options.merge(depth: options[:depth].to_i + 1))).true? }
RDF::Literal(res) # FIXME: error handling
end
end # Exprlist
end # Operator
end; end # SPARQL::Algebra
Version data entries
4 entries across 4 versions & 1 rubygems