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module SPARQL; module Algebra
class Operator
##
# The SPARQL numeric `divide` operator.
#
# @example
# (/ 4 2)
#
# @see https://www.w3.org/TR/xpath-functions/#func-numeric-divide
class Divide < Operator::Binary
include Evaluatable
NAME = [:'/', :divide]
##
# Returns the arithmetic quotient 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)
# For xsd:decimal and xsd:integer operands, if the divisor is
# (positive or negative) zero, an error is raised.
raise ZeroDivisionError, "divided by #{right}" if left.is_a?(RDF::Literal::Decimal) && right.zero?
# As a special case, if the types of both operands are
# xsd:integer, then the return type is xsd:decimal.
if left.is_a?(RDF::Literal::Integer) && right.is_a?(RDF::Literal::Integer)
RDF::Literal(left.to_d / right.to_d)
else
left / right
end
else raise TypeError, "expected two RDF::Literal::Numeric operands, but got #{left.inspect} and #{right.inspect}"
end
end
end # Divide
end # Operator
end; end # SPARQL::Algebra
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5 entries across 5 versions & 1 rubygems