module Kuroko2
  module Workflow
    module Task
      class Env < Base

        def execute
          if option
            env = token.context['ENV'] || {}
            env.merge!(parse_option(option))

            token.context['ENV'] = env
          end

          :next
        end

        def validate
          parse_option(option)
        end

        private
        def parse_option(option)
          env = {}

          scanner = StringScanner.new(option)
          until scanner.eos?
            case
            when scanner.scan(/(\w+)="((?:\\"|.)*?)"/)
              env[scanner[1]] = scanner[2].gsub(/\\"/, '"')
            when scanner.scan(/(\w+)='((?:\\'|.)*?)'/)
              env[scanner[1]] = scanner[2].gsub(/\\'/, "'")
            when scanner.scan(/(\w+)=(\S+)/)
              env[scanner[1]] = scanner[2]
            when scanner.scan(/\s+/)
            else
              raise Workflow::AssertionError, "Syntax error option value of env: #{option}"
            end
          end

          env
        end
      end
    end
  end
end