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Contents
module RDF::N3::Algebra::Math
##
# The object is calulated as the absolute value of the subject.
#
# @see https://www.w3.org/TR/xpath-functions/#func-abs
class AbsoluteValue < RDF::N3::Algebra::ResourceOperator
NAME = :mathAbsoluteValue
URI = RDF::N3::Math.absoluteValue
##
# The math:absoluteValue operator takes string or number and calculates its absolute value.
#
# @param [RDF::Term] resource
# @param [:subject, :object] position
# @return [RDF::Term]
# @see RDF::N3::ResourceOperator#evaluate
def resolve(resource, position:)
case position
when :subject
return nil unless resource.literal?
as_literal(resource.as_number.abs)
when :object
return nil unless resource.literal? || resource.variable?
resource
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