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Contents
module RDF::N3::Algebra::Math
##
# The subject or object is calculated to be the negation of the other.
#
# @see https://www.w3.org/TR/xpath-functions/#func-numeric-unary-minus
class Negation < RDF::N3::Algebra::ResourceOperator
include RDF::N3::Algebra::Builtin
NAME = :mathNegation
URI = RDF::N3::Math.negation
##
# The math:negation operator takes may have either a bound subject or object.
#
# @param [RDF::Term] resource
# @param [:subject, :object] position
# @return [RDF::Term]
# @see RDF::N3::ResourceOperator#evaluate
def resolve(resource, position:)
case resource
when RDF::Query::Variable
resource
when RDF::Literal
as_literal(-resource.as_number)
else
nil
end
end
##
# Input is either the subject or object
#
# @return [RDF::Term]
def input_operand
RDF::N3::List.new(values: operands)
end
end
end
Version data entries
4 entries across 4 versions & 1 rubygems