class RDF::N3::Algebra::Log::LangLit

Takes a list of two strings creates a language-tagged literal.

Constants

NAME
URI

Public Instance Methods

resolve(resource, position: :subject) click to toggle source

Reads the subject into the object.

Returns nil if resource does not validate, given its position

@param [RDF::N3::List] resource @return [RDF::Term]

# File lib/rdf/n3/algebra/log/langlit.rb, line 15
def resolve(resource, position: :subject)
  case position
  when :subject
    RDF::Literal(as_literal(resource.first).to_s, language: resource.last.to_s.to_sym)
  when :object
    return nil unless resource.literal? || resource.variable?
    resource
  end
end
validate(list) click to toggle source
Calls superclass method RDF::N3::Algebra::ListOperator#validate
# File lib/rdf/n3/algebra/log/langlit.rb, line 25
def validate(list)
  if super(list)
    if list.length != 2
      log_error(NAME) {"operand is not a list with two elements: #{list.to_sxp}"}
      false
    elsif !list.last.to_s.match?(/^[a-zA-Z]{1,8}(-[a-zA-Z0-9]{1,8})*$/)
      log_warn(NAME) {"second component of subject should be BCP47 language tag: #{list.last.to_sxp}"}
      false
    else
      true
    end
  else
    false
  end
end