Sha256: 9975975f80b7d3d0a651c42e5fcedf20300df729161fb9e8922fe6ef115268b1
Contents?: true
Size: 831 Bytes
Versions: 31
Compression:
Stored size: 831 Bytes
Contents
module SPARQL; module Algebra
class Operator
##
# The SPARQL `lang` operator.
#
# @see http://www.w3.org/TR/rdf-sparql-query/#func-lang
class Lang < Operator::Unary
include Evaluatable
NAME = :lang
##
# Returns the language tag of the operand, if it has one.
#
# If the operand has no language tag, returns `""`.
#
# @param [RDF::Literal] literal
# a literal
# @return [RDF::Literal] a simple literal
# @raise [TypeError] if the operand is not a literal
def apply(literal)
case literal
when RDF::Literal then RDF::Literal(literal.language.to_s)
else raise TypeError, "expected an RDF::Literal, but got #{literal.inspect}"
end
end
end # Lang
end # Operator
end; end # SPARQL::Algebra
Version data entries
31 entries across 31 versions & 1 rubygems