# Arguments: $current_p_x$ : the current physical x position # $current_l_x$ : the current logical x position # $data_size$ : # of items in a stack element # @stack : stack of directives containing logical x values # # Return Values: $max_x$ : the maximum physical x value seen at the current # logical level # @stack : stack of directives containing physical x values # for all the elements in the current block # Description: Look at each element in the stack. Find a logical block. # Recurse on each branch in that block. Assign x values to # each element in the stack and return.