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module SPARQL; module Algebra
class Operator
##
# The SPARQL relational `<=` (less than or equal) comparison operator.
#
# [114] RelationalExpression ::= NumericExpression ('<=' NumericExpression)?
#
# @example SPARQL Grammar
# PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
# PREFIX : <http://example.org/things#>
# SELECT ?x
# WHERE { ?x :p ?v . FILTER ( ?v <= 1 ) }
#
# @example SSE
# (prefix
# ((xsd: <http://www.w3.org/2001/XMLSchema#>) (: <http://example.org/things#>))
# (project (?x) (filter (<= ?v 1) (bgp (triple ?x :p ?v)))))
#
# @see https://www.w3.org/TR/sparql11-query/#OperatorMapping
# @see https://www.w3.org/TR/xpath-functions/#func-compare
# @see https://www.w3.org/TR/xpath-functions/#func-numeric-less-than
# @see https://www.w3.org/TR/xpath-functions/#func-boolean-less-than
# @see https://www.w3.org/TR/xpath-functions/#func-dateTime-less-than
class LessThanOrEqual < Compare
NAME = :<=
##
# Returns `true` if the first operand is less than or equal to the
# second operand; returns `false` otherwise.
#
# @param [RDF::Literal] left
# a literal
# @param [RDF::Literal] right
# a literal
# @return [RDF::Literal::Boolean] `true` or `false`
# @raise [TypeError] if either operand is not a literal
def apply(left, right, **options)
RDF::Literal(super <= RDF::Literal(0))
end
end # LessThanOrEqual
end # Operator
end; end # SPARQL::Algebra
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8 entries across 8 versions & 1 rubygems