Compiled splices are similar to the original Heist (interpreted) splices, but without the high performance costs of traversing a DOM at runtime. Compiled splices do all of their DOM processing at load time. They are compiled to produce a runtime computation that generates a ByteString Builder. This preserves the ability to write splices that access runtime information from the HTTP request, database, etc.
If you import both this module and Heist.Interpreted in the same file, then you will need to import them qualified.
- type Splice n = HeistT n IO (DList (Chunk n))
- renderTemplate :: Monad n => HeistState n -> ByteString -> Maybe (n Builder, MIMEType)
- mapPromises :: Monad n => (Promise a -> HeistT n IO (RuntimeSplice n Builder)) -> n [a] -> Splice n
- promiseChildren :: Monad m => HeistT m IO (RuntimeSplice m Builder)
- promiseChildrenWith :: Monad n => [(Text, a -> Builder)] -> Promise a -> HeistT n IO (RuntimeSplice n Builder)
- promiseChildrenWithTrans :: Monad n => (b -> Builder) -> [(Text, a -> b)] -> Promise a -> HeistT n IO (RuntimeSplice n Builder)
- promiseChildrenWithText :: Monad n => [(Text, a -> Text)] -> Promise a -> HeistT n IO (RuntimeSplice n Builder)
- promiseChildrenWithNodes :: Monad n => [(Text, a -> [Node])] -> Promise a -> HeistT n IO (RuntimeSplice n Builder)
- yieldPure :: Builder -> DList (Chunk m)
- yieldRuntime :: RuntimeSplice m Builder -> DList (Chunk m)
- yieldRuntimeEffect :: Monad m => RuntimeSplice m () -> DList (Chunk m)
- yieldPureText :: Text -> DList (Chunk m)
- yieldRuntimeText :: Monad m => RuntimeSplice m Text -> DList (Chunk m)
- yieldLater :: Monad m => m Builder -> DList (Chunk m)
- addSplices :: Monad m => [(Text, Splice n)] -> HeistT n m ()
- data Promise a
- newEmptyPromise :: HeistT n IO (Promise a)
- getPromise :: Monad m => Promise a -> RuntimeSplice m a
- putPromise :: Monad m => Promise a -> a -> RuntimeSplice m ()
- adjustPromise :: Monad m => Promise a -> (a -> a) -> RuntimeSplice m ()
- codeGen :: Monad m => [Chunk m] -> RuntimeSplice m Builder
- runNodeList :: Monad n => [Node] -> Splice n
- runNode :: Monad n => Node -> Splice n
- compileNode :: Monad n => Node -> Splice n
- runAttributes :: Monad n => [(Text, Text)] -> HeistT n IO [DList (Chunk n)]
- runSplice :: Monad n => Node -> HeistState n -> Splice n -> IO [Chunk n]
High level compiled splice API
A compiled Splice is a HeistT computation that returns a
The more interesting part of the type signature is what comes before the
return value. The first type parameter in
is the runtime
monad. This reveals that the Chunks know about the runtime monad. The
second type parameter in
HeistT n IO
HeistT n IO is
IO. This tells is that the
compiled splices themselves are run in the IO monad, which will usually
mean at load time. Compiled splices run at load time, and they return
computations that run at runtime.
Looks up a compiled template and returns a runtime monad computation that constructs a builder.
|:: Monad n|
|=> (Promise a -> HeistT n IO (RuntimeSplice n Builder))|
|-> n [a]|
Runtime computation returning a list of items
|-> Splice n|
Takes a promise function and a runtime action returning a list of items that fit in the promise and returns a Splice that executes the promise function for each item and concatenates the results.
Returns a runtime computation that simply renders the node's children.
Binds a list of Builder splices before using the children of the spliced node as a view.
Wrapper that composes a transformation function with the second item in each of the tuples before calling promiseChildren.
Binds a list of Text splices before using the children of the spliced node as a view.
Binds a list of Node splices before using the children of the spliced node as a view. Note that this will slow down page generation because the nodes generated by the splices must be traversed and rendered into a ByteString at runtime.
The internals of the Chunk data type are deliberately not exported because
we want to hide the underlying implementation as much as possible. The
yield... functions give you lower lever construction of Chunks and DLists
Yields a pure Builder known at load time. You should use this and
yieldPureText as much as possible to maximize the parts of your page that
can be compiled to static ByteStrings.
Yields a runtime action that returns a builder.
Yields a runtime action that returns no value and is only needed for its side effect.
A convenience wrapper around yieldPure for working with Text. Roughly
textSplice from Heist.Interpreted.
Convenience wrapper around yieldRuntime allowing you to work with Text.
This lets you turn a plain runtime monad function returning a Builder into a compiled splice.
Adds a list of compiled splices to the splice map. This function is useful because it allows compiled splices to bind other compiled splices during load-time splice processing.
Lower level promise functions
Promises are used for referencing the results of future runtime computations during load time splice processing.
Gets the result of a promised runtime computation.
Adds a promise to the runtime splice context.
Given a list of output chunks, consolidate turns consecutive runs of
Pure Html values into maximally-efficient pre-rendered strict
Running nodes and splices
Returns a computation that performs load-time splice processing on the supplied list of nodes.
Runs a single node. If there is no splice referenced anywhere in the subtree, then it is rendered as a pure chunk, otherwise it is compiled to a runtime computation.
Node in the DOM tree, produces a "runtime splice" that will
generate html at runtime. Leaves the writer monad state untouched.
Performs splice processing on a list of attributes. This is useful in situations where you need to stop recursion, but still run splice processing on the node's attributes.