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module SPARQL; module Algebra
class Operator
##
# The SPARQL `iri` operator.
#
# @example
# (base <http://example.org/> (project (?uri ?iri)
# (extend ((?uri (uri "uri")) (?iri (iri "iri")))
# (bgp))))
#
# @see http://www.w3.org/TR/rdf-sparql-query/#func-iri
class IRI < Operator::Unary
include Evaluatable
NAME = [:iri, :uri]
##
# The IRI function constructs an IRI by resolving the string argument (see RFC 3986 and RFC 3987 or any later RFC that superceeds RFC 3986 or RFC 3987). The IRI is resolved against the base IRI of the query and must result in an absolute IRI.
#
# The URI function is a synonym for IRI.
#
# If the function is passed an IRI, it returns the IRI unchanged.
#
# Passing any RDF term other than a simple literal, xsd:string or an IRI is an error.
#
# An implementation may normalize the IRI.
#
# @param [RDF::Term] literal
# a simple literal
# @return [RDF::URI]
# @raise [TypeError] if the operand is not a simple literal
def apply(literal)
raise TypeError, "expected an simple literal, but got #{literal.inspect}" unless literal.literal? && literal.simple?
base = Operator.base_uri || RDF::URI("")
base.join(literal.to_s)
end
Operator::URI = IRI
end # IRI
end # Operator
end; end # SPARQL::Algebra
Version data entries
16 entries across 16 versions & 1 rubygems