module Network.CrawlChain.CrawlDirective where

import Network.CrawlChain.CrawlAction
import Network.CrawlChain.CrawlResult

data CrawlDirective =
    SimpleDirective (String -> [CrawlAction])          -- | access content to find absolute follow-up urls
  | RelativeDirective (String -> [CrawlAction])        -- | as simple, but found relative urls are completed
  | FollowUpDirective (CrawlResult -> [CrawlAction])   -- | as simple, but with access to complete result
  | DelayDirective Int CrawlDirective                  -- | wait additional seconds before executing
  | RetryDirective Int CrawlDirective                  -- | if given directive yields no results use add. retries
  | AlternativeDirective CrawlDirective CrawlDirective -- | fallback to second argument if first yields no results
  | RestartChainDirective (CrawlAction, CrawlDirective)-- | the possibility to start a new chain (when using alternative)
  | DirectiveSequence [CrawlDirective]                 -- | chaining of directives