class RDF::N3::Algebra::List::Append

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.

Constants

NAME
URI

Public Instance Methods

resolve(list) click to toggle source

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

# File lib/rdf/n3/algebra/list/append.rb, line 20
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
validate(list) click to toggle source

The list argument must be a pair of literals.

@param [RDF::N3::List] list @return [Boolean] @see RDF::N3::ListOperator#validate

Calls superclass method RDF::N3::Algebra::ListOperator#validate
# File lib/rdf/n3/algebra/list/append.rb, line 33
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