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Contents
module SPARQL; module Algebra
class Operator
include Evaluatable
##
# The SPARQL numeric `add` operator.
#
# @example
# (+ 1 ?x)
# (add 1 ?x)
#
# @see http://www.w3.org/TR/xpath-functions/#func-numeric-add
class Add < Operator::Binary
NAME = [:+, :add]
##
# Returns the arithmetic sum of the operands.
#
# @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)
case
when left.is_a?(RDF::Literal::Numeric) && right.is_a?(RDF::Literal::Numeric)
left + right
else raise TypeError, "expected two RDF::Literal::Numeric operands, but got #{left.inspect} and #{right.inspect}"
end
end
end # Add
end # Operator
end; end # SPARQL::Algebra
Version data entries
24 entries across 24 versions & 1 rubygems