rpl.rb/lib/runner.rb

# frozen_string_literal: true

module Rpl
  module Lang
    module_function

    def run_input( input, stack, dictionary )
      dictionary.add_local_vars_layer

      input.each do |elt|
        case elt[:type]
        when :word
          command = dictionary.lookup( elt[:value] )

          if command.nil?
            # if there's command by that name then it's a name
            elt[:type] = :name

            stack << elt
          else
            stack, dictionary = command.call( stack, dictionary )
          end
        else
          stack << elt
        end
      end

      dictionary.remove_local_vars_layer

      [stack, dictionary]
    end
  end
end