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Contents
module SPARQL; module Algebra
class Operator
##
# The SPARQL numeric binary/unary `+` operator.
#
# @example
# (+ ?x ?y)
# (plus ?x ?y)
#
# @see http://www.w3.org/TR/xpath-functions/#func-numeric-unary-plus
# @see http://www.w3.org/TR/xpath-functions/#func-numeric-add
class Plus < Operator::Unary
include Evaluatable
NAME = [:+, :plus]
##
# Returns the arithmetic sum of the operands, unless there is no `right`.
#
# @param [RDF::Literal::Numeric] left
# a numeric literal
# @param [RDF::Literal::Numeric] right
# a numeric literal
# @return [RDF::Literal::Numeric]
# @raise [TypeError] if either operand is not a numeric literal
def apply(left, right = nil)
case
when left.is_a?(RDF::Literal::Numeric) && right.is_a?(RDF::Literal::Numeric)
left + right
when left.is_a?(RDF::Literal::Numeric) && right.nil?
left
else raise TypeError, "expected two RDF::Literal::Numeric operands, but got #{left.inspect} and #{right.inspect}"
end
end
end # Plus
end # Operator
end; end # SPARQL::Algebra
Version data entries
17 entries across 17 versions & 1 rubygems