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Contents
module SPARQL; module Algebra
class Operator
##
# The SPARQL numeric `subtract` operator.
# (- ?x ?y)
# (subtract ?x ?y)
#
# @see http://www.w3.org/TR/xpath-functions/#func-numeric-subtract
class Subtract < Operator::Binary
include Evaluatable
NAME = [:-, :subtract]
##
# Returns the arithmetic difference 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 # Subtract
end # Operator
end; end # SPARQL::Algebra
Version data entries
42 entries across 42 versions & 1 rubygems