Haskell 可配置的路径前缀
我有以下web服务器:Haskell 可配置的路径前缀,haskell,yesod,template-haskell,Haskell,Yesod,Template Haskell,我有以下web服务器: {-# LANGUAGE OverloadedStrings #-} {-# LANGUAGE QuasiQuotes #-} {-# LANGUAGE TemplateHaskell #-} {-# LANGUAGE TypeFamilies #-} import Data.Text (Text) import Yesod data App = App mkYesod "App" [pa
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE QuasiQuotes #-}
{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE TypeFamilies #-}
import Data.Text (Text)
import Yesod
data App = App
mkYesod "App" [parseRoutes|
/ HomeR GET
/link1 Link1R GET
/link2 Link2R GET
/link3 Link3R GET
/link4 Link4R GET
|]
instance Yesod App where
getHomeR :: Handler Html
getHomeR = defaultLayout $ do
setTitle "Redirects"
[whamlet|
<p>
<a href=@{Link1R}>Click to start the redirect chain!
|]
getLink1R, getLink2R, getLink3R :: Handler ()
getLink1R = redirect Link2R -- /link2
getLink2R = redirect (Link3R, [("foo", "bar")]) -- /link3?foo=bar
getLink3R = redirect $ Link4R :#: ("baz" :: Text) -- /link4#baz
getLink4R :: Handler Html
getLink4R = defaultLayout
[whamlet|
<p>You made it!
|]
main :: IO ()
main = warp 3000 App
我如何做到这一点
我尝试了
approt
,但似乎不起作用…我正在使用cleanPath
删除前缀:
cleanPath app s =
if corrected == s
then Right $ dropPrefix $ map dropDash s
else Left corrected
where
corrected = filter (not . T.null) s
dropDash t
| T.all (== '-') t = T.drop 1 t
| otherwise = t
dropPrefix s' = case routePrefix $ appSettings app of
Nothing -> s'
Just prefix -> case headMay s' of
Just t -> if t == prefix then drop 1 s' else ["wrong prefix"]
Nothing -> ["wrong prefix"]
如果你知道更好的方法,请评论或添加答案。谢谢 我正在使用
cleanPath
删除前缀:
cleanPath app s =
if corrected == s
then Right $ dropPrefix $ map dropDash s
else Left corrected
where
corrected = filter (not . T.null) s
dropDash t
| T.all (== '-') t = T.drop 1 t
| otherwise = t
dropPrefix s' = case routePrefix $ appSettings app of
Nothing -> s'
Just prefix -> case headMay s' of
Just t -> if t == prefix then drop 1 s' else ["wrong prefix"]
Nothing -> ["wrong prefix"]
如果你知道更好的方法,请评论或添加答案。谢谢 我不完全确定我是否明白问题是什么。什么不起作用?url前缀来自设置或环境变量。我不确定最好的方法是什么。它应该是编译时还是运行时的变量?如果是后者,那么模板Haskell不可能用于它。两者都可以作为选项。出于学习目的,什么是最好的方法?我对函数式编程相当陌生:)非常感谢!我认为编译时会更好,但我想学习这两种解决方案。我不完全确定我是否理解PPR问题是什么。什么不起作用?url前缀来自设置或环境变量。我不确定最好的方法是什么。它应该是编译时还是运行时的变量?如果是后者,那么模板Haskell不可能用于它。两者都可以作为选项。出于学习目的,什么是最好的方法?我对函数式编程相当陌生:)非常感谢!我认为编译时会更好,但我想学习这两种解决方案。