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Contents
module SPARQL; module Algebra
class Operator
##
# The SPARQL ascending sort operator.
#
# [24] OrderCondition ::= ( ( 'ASC' | 'DESC' ) BrackettedExpression ) | ( Constraint | Var )
#
# @example SPARQL Query
# PREFIX foaf: <http://xmlns.com/foaf/0.1/>
# SELECT ?name
# WHERE { ?x foaf:name ?name }
# ORDER BY ASC(?name)
#
# @example SSE
# (prefix ((foaf: <http://xmlns.com/foaf/0.1/>))
# (project (?name)
# (order ((asc ?name))
# (bgp (triple ?x foaf:name ?name)))))
#
# @see https://www.w3.org/TR/sparql11-query/#modOrderBy
class Asc < Operator::Unary
include Evaluatable
NAME = :asc
##
# Returns the evaluation of its operand. Default comparison is in
# ascending order. Ordering is applied in {Order}.
#
# @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::Term]
def evaluate(bindings, **options)
operand(0).evaluate(bindings, depth: options[:depth].to_i + 1, **options)
end
##
#
# Returns a partial SPARQL grammar for this operator.
#
# Provides order to descendant query.
#
# @return [String]
def to_sparql(**options)
"ASC(#{operands.last.to_sparql(**options)})"
end
end # Asc
end # Operator
end; end # SPARQL::Algebra
Version data entries
4 entries across 4 versions & 1 rubygems