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module RDF::N3::Algebra::List
##
# Iff the subject is a list of lists and the concatenation of all those lists is the object, then this is true. The object can be calculated as a function of the subject.
#
# @example
# ( (1 2) (3 4) ) list:append (1 2 3 4).
#
# The object can be calculated as a function of the subject.
class Append < RDF::N3::Algebra::ListOperator
NAME = :listAppend
URI = RDF::N3::List.append
##
# Resolves this operator using the given variable `bindings`.
# If the last operand is a variable, it creates a solution for each element in the list.
#
# @param [RDF::N3::List] list
# @return [RDF::Term]
# @see RDF::N3::ListOperator#evaluate
def resolve(list)
flattened = list.to_a.map(&:to_a).flatten
# Bind a new list based on the values, whos subject use made up from original list subjects
subj = RDF::Node.intern(list.map(&:subject).hash)
RDF::N3::List.new(subject: subj, values: flattened)
end
##
# The list argument must be a pair of literals.
#
# @param [RDF::N3::List] list
# @return [Boolean]
# @see RDF::N3::ListOperator#validate
def validate(list)
if super && list.to_a.all? {|li| li.list?}
true
else
log_error(NAME) {"operand is not a list of lists: #{list.to_sxp}"}
false
end
end
end
end
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4 entries across 4 versions & 1 rubygems