{-# LANGUAGE BangPatterns #-} {-# LANGUAGE OverloadedStrings #-} {-# LANGUAGE TupleSections #-} {-| This module defines the core data types used by Heist. In practice you will also want to import one or both of "Heist.Compiled" or "Heist.Interpreted" to get functions needed for writing splices. The Heist template system allows you to build custom HTML and XML based markup languages. With Heist you can define your own domain-specific tags implemented with Haskell and use them in your templates. -} module Heist ( -- * Primary Heist initialization functions loadTemplates , reloadTemplates , addTemplatePathPrefix , initHeist , initHeistWithCacheTag , defaultInterpretedSplices , defaultLoadTimeSplices , emptyHeistConfig -- * Core Heist data types , SpliceConfig , HeistConfig , TemplateRepo , TemplateLocation , Template , TPath , MIMEType , DocumentFile(..) , AttrSplice , RuntimeSplice , Chunk , HeistState , HeistT -- * Lenses (can be used with lens or lens-family) , scInterpretedSplices , scLoadTimeSplices , scCompiledSplices , scAttributeSplices , scTemplateLocations , hcSpliceConfig , hcNamespace , hcErrorNotBound , hcInterpretedSplices , hcLoadTimeSplices , hcCompiledSplices , hcAttributeSplices , hcTemplateLocations -- * HeistT functions , templateNames , compiledTemplateNames , hasTemplate , spliceNames , compiledSpliceNames , evalHeistT , getParamNode , getContext , getTemplateFilePath , localParamNode , getsHS , getHS , putHS , modifyHS , restoreHS , localHS , getDoc , getXMLDoc , tellSpliceError , orError , module Heist.SpliceAPI ) where ------------------------------------------------------------------------------ import Control.Exception (SomeException) import Control.Monad.CatchIO import Control.Monad.State import Control.Monad.Trans.Either import Data.ByteString (ByteString) import qualified Data.ByteString as B import Data.Either import qualified Data.Foldable as F import Data.HashMap.Strict (HashMap) import qualified Data.HashMap.Strict as Map import qualified Data.HeterogeneousEnvironment as HE import Data.Map.Syntax import Data.Monoid import Data.Text (Text) import qualified Data.Text as T import System.Directory.Tree import qualified Text.XmlHtml as X ------------------------------------------------------------------------------ import Heist.Common import qualified Heist.Compiled.Internal as C import qualified Heist.Interpreted.Internal as I import Heist.SpliceAPI import Heist.Splices import Heist.Internal.Types ------------------------------------------------------------------------------ ------------------------------------------------------------------------------ -- | The built-in set of splices that you should use in compiled splice mode. -- This list includes everything from 'defaultInterpretedSplices' plus a -- splice for the content tag that errors out when it sees any instance of the -- old content tag, which has now been moved to two separate tags called -- apply-content and bind-content. defaultLoadTimeSplices :: MonadIO m => Splices (I.Splice m) defaultLoadTimeSplices = do -- To be removed in later versions defaultInterpretedSplices "content" #! deprecatedContentCheck ------------------------------------------------------------------------------ -- | The built-in set of static splices. All the splices that used to be -- enabled by default are included here. To get the normal Heist behavior you -- should include these in the scLoadTimeSplices list in your SpliceConfig. -- If you are using interpreted splice mode, then you might also want to bind -- the 'deprecatedContentCheck' splice to the content tag as a load time -- splice. defaultInterpretedSplices :: MonadIO m => Splices (I.Splice m) defaultInterpretedSplices = do applyTag ## applyImpl bindTag ## bindImpl ignoreTag ## ignoreImpl markdownTag ## markdownSplice ------------------------------------------------------------------------------ -- | An empty HeistConfig that uses the \"h\" namespace with error checking -- turned on. emptyHeistConfig :: HeistConfig m emptyHeistConfig = HeistConfig mempty "h" True allErrors :: [Either String (TPath, v)] -> EitherT [String] IO (HashMap TPath v) allErrors tlist = case errs of [] -> right $ Map.fromList $ rights tlist _ -> left errs where errs = lefts tlist ------------------------------------------------------------------------------ -- | Loads templates from disk. This function returns just a template map so -- you can load multiple directories and combine the maps before initializing -- your HeistState. loadTemplates :: FilePath -> EitherT [String] IO TemplateRepo loadTemplates dir = do d <- lift $ readDirectoryWith (loadTemplate dir) dir allErrors $ F.fold (free d) ------------------------------------------------------------------------------ -- | Reloads all the templates an an existing TemplateRepo. reloadTemplates :: TemplateRepo -> EitherT [String] IO TemplateRepo reloadTemplates repo = do tlist <- lift $ mapM loadOrKeep $ Map.toList repo allErrors tlist where loadOrKeep (p,df) = case dfFile df of Nothing -> return $ Right (p, df) Just fp -> do df' <- loadTemplate' fp return $ fmap (p,) $ case df' of [t] -> t _ -> Left "Template repo has non-templates" ------------------------------------------------------------------------------ -- | Adds a path prefix to a templates in a map returned by loadTemplates. If -- you want to add multiple levels of directories, separate them with slashes -- as in "foo/bar". Using an empty string as a path prefix will leave the -- map unchanged. addTemplatePathPrefix :: ByteString -> TemplateRepo -> TemplateRepo addTemplatePathPrefix dir ts | B.null dir = ts | otherwise = Map.fromList $ map (\(x,y) -> (f x, y)) $ Map.toList ts where f ps = ps++splitTemplatePath dir ------------------------------------------------------------------------------ -- | Creates an empty HeistState. emptyHS :: HE.KeyGen -> HeistState m emptyHS kg = HeistState Map.empty Map.empty Map.empty Map.empty Map.empty True [] 0 [] Nothing kg False Html "" [] False ------------------------------------------------------------------------------ -- | This is the main Heist initialization function. You pass in a map of all -- templates and all of your splices and it constructs and returns a -- HeistState. -- -- We don't provide functions to add either type of loadtime splices to your -- HeistState after initHeist because it doesn't make any sense unless you -- re-initialize all templates with the new splices. If you add any old-style -- runtime heist splices after calling this function, they will still work -- fine if you use Heist.Interpreted.renderTemplate. If you add any templates -- later, then those templates will be available for interpreted rendering, -- but not for compiled rendering. -- -- In the past you could add templates to your HeistState after initialization -- using its Monoid instance. Due to implementation details, this is no -- longer possible. All of your templates must be known when you call this -- function. initHeist :: Monad n => HeistConfig n -> EitherT [String] IO (HeistState n) initHeist hc = do keyGen <- lift HE.newKeyGen repos <- sequence $ _scTemplateLocations $ _hcSpliceConfig hc initHeist' keyGen hc (Map.unions repos) ------------------------------------------------------------------------------ mkSplicePrefix :: Text -> Text mkSplicePrefix ns | T.null ns = "" | otherwise = ns `mappend` ":" ------------------------------------------------------------------------------ initHeist' :: Monad n => HE.KeyGen -> HeistConfig n -> TemplateRepo -> EitherT [String] IO (HeistState n) initHeist' keyGen (HeistConfig sc ns enn) repo = do let empty = emptyHS keyGen let (SpliceConfig i lt c a _) = sc tmap <- preproc keyGen lt repo ns let prefix = mkSplicePrefix ns is <- runHashMap $ mapK (prefix<>) i cs <- runHashMap $ mapK (prefix<>) c as <- runHashMap $ mapK (prefix<>) a let hs1 = empty { _spliceMap = is , _templateMap = tmap , _compiledSpliceMap = cs , _attrSpliceMap = as , _splicePrefix = prefix , _errorNotBound = enn } EitherT $ C.compileTemplates hs1 -- liftIO $ when (not $ null $ _spliceErrors hs2) $ do -- putStrLn "Finished compiling with errors..." -- mapM_ T.putStrLn $ _spliceErrors hs2 -- case _spliceErrors hs2 of -- [] -> return hs2 -- es -> left $ map T.unpack es ------------------------------------------------------------------------------ -- | Runs preprocess on a TemplateRepo and returns the modified templates. preproc :: HE.KeyGen -> Splices (I.Splice IO) -> TemplateRepo -> Text -> EitherT [String] IO TemplateRepo preproc keyGen splices templates ns = do sm <- runHashMap splices let hs = (emptyHS keyGen) { _spliceMap = sm , _templateMap = templates , _preprocessingMode = True , _splicePrefix = mkSplicePrefix ns } let eval a = evalHeistT a (X.TextNode "") hs tPairs <- lift $ mapM (eval . preprocess) $ Map.toList templates let bad = lefts tPairs if not (null bad) then left bad else right $ Map.fromList $ rights tPairs ------------------------------------------------------------------------------ -- | Processes a single template, running load time splices. preprocess :: (TPath, DocumentFile) -> HeistT IO IO (Either String (TPath, DocumentFile)) preprocess (tpath, docFile) = do let tname = tpathName tpath !emdoc <- try $ I.evalWithDoctypes tname :: HeistT IO IO (Either SomeException (Maybe X.Document)) let f !doc = (tpath, docFile { dfDoc = doc }) return $! either (Left . show) (Right . maybe die f) emdoc where die = error "Preprocess didn't succeed! This should never happen." ------------------------------------------------------------------------------ -- | Wrapper around initHeist that also sets up a cache tag. It sets up both -- compiled and interpreted versions of the cache tag splices. If you need to -- configure the cache tag differently than how this function does it, you -- will still probably want to pattern your approach after this function's -- implementation. initHeistWithCacheTag :: MonadIO n => HeistConfig n -> EitherT [String] IO (HeistState n, CacheTagState) initHeistWithCacheTag (HeistConfig sc ns enn) = do (ss, cts) <- liftIO mkCacheTag let tag = "cache" keyGen <- lift HE.newKeyGen repos <- sequence $ _scTemplateLocations sc -- We have to do one preprocessing pass with the cache setup splice. This -- has to happen for both interpreted and compiled templates, so we do it -- here by itself because interpreted templates don't get the same load -- time splices as compiled templates. rawWithCache <- preproc keyGen (tag ## ss) (Map.unions repos) ns let sc' = SpliceConfig (tag #! cacheImpl cts) mempty (tag #! cacheImplCompiled cts) mempty mempty let hc = HeistConfig (mappend sc sc') ns enn hs <- initHeist' keyGen hc rawWithCache return (hs, cts)