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module SPARQL; module Algebra
class Operator
##
# The SPARQL `function_call` operator.
#
# [70] FunctionCall ::= iri ArgList
#
# @example SPARQL Grammar
# PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
# SELECT *
# WHERE { ?s ?p ?o . FILTER xsd:integer(?o) }
#
# @example SSE
# (prefix
# ((xsd: <http://www.w3.org/2001/XMLSchema#>))
# (filter (xsd:integer ?o)
# (bgp (triple ?s ?p ?o))))
#
# @see https://www.w3.org/TR/sparql11-query/#funcex-regex
# @see https://www.w3.org/TR/xpath-functions/#func-matches
class FunctionCall < Operator
include Evaluatable
NAME = :function_call
##
# Invokes the function with the passed arguments.
#
# @param [RDF::IRI] iri
# Identifies the function
# @param [Array<RDF::Term>] args
# @return [RDF::Term]
def apply(iri, *args, **options)
args = RDF.nil == args.last ? args[0..-2] : args
SPARQL::Algebra::Expression.extension(iri, *args, **options)
end
##
# Returns the SPARQL S-Expression (SSE) representation of this expression.
#
# Remove the optional argument.
#
# @return [Array] `self`
# @see https://openjena.org/wiki/SSE
def to_sxp_bin
@operands.map(&:to_sxp_bin)
end
##
#
# Returns a partial SPARQL grammar for this operator.
#
# @return [String]
def to_sparql(**options)
iri, args = operands
iri.to_sparql(**options) +
'(' +
args.to_sparql(delimiter: ', ', **options) +
')'
end
end # FunctionCall
end # Operator
end; end # SPARQL::Algebra
Version data entries
7 entries across 7 versions & 1 rubygems