Contents

module ShEx::Algebra
  ##
  class SemAct < Operator
    NAME = :semact

    #
    # The evaluation semActsSatisfied on a list of SemActs returns success or failure. The evaluation of an individual SemAct is implementation-dependent.
    # @param [Array<RDF::Statement>] statements
    # @return [Boolean] `true` if satisfied, `false` if it does not apply
    # @raise [ShEx::NotSatisfied] if not satisfied
    def satisfies?(statements)
      # FIXME: should have a registry
      case operands.first.to_s
      when "http://shex.io/extensions/Test/"
        str = if md = /^ *(fail|print) *\( *(?:(\"(?:[^\\"]|\\")*\")|([spo])) *\) *$/.match(operands[1].to_s)
          md[2] || case md[3]
          when 's' then statements.first.subject
          when 'p' then statements.first.predicate
          when 'o' then statements.first.object
          else          statements.first.to_sxp
          end.to_s
        else
          statements.empty? ? 'no statement' : statements.first.to_sxp
        end
        $stdout.puts str
        status str
        not_satisfied "fail" if md && md[1] == 'fail'
        true
      else
        status("unknown SemAct name #{operands.first}") {"expression: #{self.to_sxp}"}
        false
      end
    end

    # Does This operator is SemAct
    def semact?; true; end
  end
end

Version data entries

2 entries across 2 versions & 1 rubygems

Version	Path
shex-0.2.0	lib/shex/algebra/semact.rb
shex-0.1.0	lib/shex/algebra/semact.rb