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Contents
module RDF::N3::Algebra::Math
##
# **schema**:
# `$a1 math:equalTo $a2`
#
# **summary**:
# checks equality of numbers
#
# **definition**:
# `true` if and only if `$a1` is equal to `$a2`.
# Requires both arguments to be either concrete numerals, or variables bound to a numeral.
#
# **literal domains**:
#
# * `$a1`: `xs:decimal` (or its derived types), `xs:float`, or `xs:double` (see note on type promotion, and casting from string)
# * `$a2`: `xs:decimal` (or its derived types), `xs:float`, or `xs:double` (see note on type promotion, and casting from string)
#
# @see https://www.w3.org/TR/xpath-functions/#func-numeric-equal
class EqualTo < RDF::N3::Algebra::ResourceOperator
NAME = :mathEqualTo
URI = RDF::N3::Math.equalTo
##
# Resolves inputs as numbers.
#
# @param [RDF::Term] resource
# @param [:subject, :object] position
# @return [RDF::Term]
# @see RDF::N3::ResourceOperator#evaluate
def resolve(resource, position:)
resource.as_number if resource.term?
end
# Both subject and object are inputs.
def input_operand
RDF::N3::List.new(values: operands)
end
##
# Returns TRUE if `term1` and `term2` are the same numeric value.
#
# @param [RDF::Term] term1
# an RDF term
# @param [RDF::Term] term2
# an RDF term
# @return [RDF::Literal::Boolean] `true` or `false`
# @raise [TypeError] if either operand is not an RDF term or operands are not comperable
#
# @see RDF::Term#==
def apply(term1, term2)
RDF::Literal(term1 == term2)
end
end
end
Version data entries
4 entries across 4 versions & 1 rubygems